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Home My WebLink About20174245.tiffBEFORE THE WELD COUNTY, COLORADO, BOARD OF HEALTH RESOLUTION OF RECOMMENDATION TO THE BOARD OF COUNTY COMMISSIONERS Moved by LINDA KAUTZ, that the following resolution be introduced for passage by the Weld County Board of Health. Be it resolved by the Weld County Board of Health that the application for: CASE NUMBER: PRESENTED BY: REQUEST: ORDINANCE 2017-10 KATIE SALL AND LAUREN LIGHT, ENVIRONMENTAL HEALTH DIVISION WELD COUNTY CODE ORDINANCE #2017-10, IN THE MATTER OF REPEALING AND RE-ENACTING, WITH AMENDMENTS CHAPTER 30 ONSITE WASTEWATER TREATMENT SYSTEM REGULATIONS OF WELD COUNTY CODE. be recommended favorably to the Board of County Commissioners for the following reasons: Motion seconded by JOYCE SMOCK. VOTE: For Passage Jason Maxey Jim Rohn Linda Kautz James Kuemmerle Joyce Smock Sandra Owens Against Passage Absent Bill Wood Tim Annable Nicholas Berryman The Chair declared the resolution passed and ordered that a certified copy be forwarded with the file of this case to the Board of County Commissioner's for further proceedings. CERTIFICATION OF COPY I, Sandra Monge, Recording Secretary for the Weld County Board of Public Health, do hereby certify that the above and foregoing resolution is a true copy of the resolution of the Board of Public Health of Weld County, Colorado, adopted on November 28, 2017. Dated the 28th of November 2017. ccQ ilotret_ rtse, Sandra Monge Secretary 2017-4245 November 28, 2017 9:00 A.M. Weld County Department of Public Health and Environment Second Floor Hearing Room 210 The Weld County Board of Health met November 28, 2017, at 9:00 a.m. in the second -floor hearing room of the Weld County Department of Public Health and Environment. Those present included: Board Members: Jason Maxey, Chair; Joyce Smock, Vice Chair; Sandra Owens, Linda Kautz, Jim Rohn and James Kuemmerle. Others: Katie Sall, Environmental Health Services,(WCDPH&E), Lauren Light, Environmental Health Manager, (WCDPH&E), Debra Adamson, Environmental Health Director (WCDPH&E) and Frank Haug, Assistant County Attorney. APPROVAL OF AGENDA A motion was made by Jim Rohn to approve the agenda as presented. Joyce Smock seconded the motion and the motion was carried unanimously. APPROVAL OF MINUTES Discussion about the amended October 24, 2017 minutes; it was noted in the minutes that James Kuemmerle made a motion to approve the Veris permit/design report and Jim Rohn seconded the motion. Jim Rohn mentioned some blanks on the minutes from October 24, 2017. Correction: the motion to approve the Veris Permit was made by Tim Annable, and Jim Rohn seconded. It is not known who motioned to approve the engineer design report. It was discussed that Sandra Monge will listen to the recording and get corrections for who made the motion for the engineer design report. A motion was made to approve the minutes as amended, with corrections by Sandra Monge, by Linda Kautz and Joyce smock seconded the motion. The motion was carried unanimously. CONSENT ITEMS Veris Environmental LLC. - DS200108, DS200114, DS200419, DS200630, DS200631, DS200633, DS200634, DS200606, DS200809, DS200833, DS201113, DS201212, DS200832, DS200632, DS200434, DS201010, DS201112, DS201009, DS201114, DS990031, A motion was made by Linda Kautz to approve biosolids renewal applications for Veris Environmental and Jim Rohn seconded the motion, and the motion was carried unanimously. NEW BUSINESS New biosolids application for Veris Environmental LLC — DS1700011. It was noted during the presentation that the agenda provided to the BOH members was incorrect, and the new business items were not on the agenda. A corrected agenda was provided by Lauren Light. Katie Sall presented the application for the biosolids permit. Referral letters were received by Planning with no comment, and Public Works with their standard conditions. No public comment was received on this application. Environmental Health recommended approval of this permit. Luke Bond with Veris Environmental, LLC, who is the applicant for the biosolids permits was noted to be present. Joyce Smock asked a question on the location of the biosolids application site. Jim Rohn motioned to approve new biosolids application and James Kuemmerle seconded the motion, and the motion was carried by unanimous roll call vote. Yes: Jason Maxey, Joyce Smock, Linda Kautz, Jim Rohn, James Kuemmerle, Sandra Owens. New biosolid application for Veris Environmental LLC — DS1700012. Katie Sall presented the application for the biosolids permit. Referral letters were received by Planning with no comment, and Public Works with their standard conditions. No public comment Board of Health Minutes Page 2 was received on this application. Environmental Health recommended approval of this permit. Joyce Smock had questions on the location of the permit application, which were resolved. A motion was made by Linda Kautz to approve new biosolids application and Joyce seconded the motion, and the motion was carried by unanimous roll call vote. Yes: Jason Maxey, Joyce Smock, Linda Kautz, Jim Rohn, James Kuemmerle, Sandra Owens. New biosolids application for Veris Environmental LLC - DS1700013. Katie Sall presented the application for the biosolids permit. Referral letters were received by Planning with no comment, and Public Works with their standard conditions. No public comment was received on this application. Environmental Health recommended approval of this permit. A motion was made by Sandra Owens to approve biosolids application and Jim Rohn seconded the motion, and the motion was carried by unanimous roll call vote. Yes: Jason Maxey, Joyce Smock, Linda Kautz, Jim Rohn, James Kuemmerle, Sandra Owens. Public Hearing On Site Waste Water Treatment System Code Changes, Weld County Code Chapter 30 Lauren Light, Environmental Health Manager, presented on updates to the OWTS Regulations. The current regulations went into effect July 1, 2014. The Water Quality Control Division adopted regulations May 8, 2017, and they require every county to update their regulations. Recent changes need to be updated by the end of June 2018. The draft regulations were sent to the State for review and a letter was sent by the State, which has been received for some clean up items to the draft regulations. Public notice was completed. Letters and emails were sent to septic installers, engineers and cleaners notifying them of the upcoming changes. The changes are also posted on the Weld County Website. Work sessions were done with the County Commissioners to notify them of the upcoming changes. A lunch and learn presentation was done for the Planning Commission for informational purposes. Three hearings have been set up with the County Commissioners to hear the code changes. It is noted that the Chapter 30 code changes have been done to the minimum requirements of the Water Quality Control Division and no items more stringent than the Water Quality Control Division Regulation 43 have been added. Katie Sall presented on notable changes to the OWTS Regulations. Item number one: Experimental permits vs. Product Development. Experimental permits are being removed and replaced with Product Development Permits. The product development permit must be approved before the Water Quality Control Division and then a permit can be applied for with the local County. Jason Maxey had some questions about time frames from the State Health Department; it was noted that each type of product development permit must go to the State only once for approval. Board of Health Minutes Page 3 Jim Rohn commented on manufacturing process and experimental products. Item number 2: The County can penalize homeowners for being out of compliance. Fines can be issued for being out of compliance with the regulations. An appeal process has been added as well. Jim Rohn commented on homeowners being financially burdened and the assistance in the County that could help homeowners fix their systems; Housing Authority). Item number 3: The State will require that two test pits be dug instead of one. The engineer will have the option to do the two test pits and percolation tests if they choose. They need to use the most restrictive sizing and evaluate the consistence of the soil as well. They can cover the test pits for safety reasons. Joyce Smock asked if there are issues with test pits? Katie Sall replied it was for consistency for better sizing. Item number 4: A section on clean outs has been added, previously clean outs were addressed by the plumbing code. Item number 5: A section on sizing for soil with rock content for better sizing and design of systems has been added. Item number 6: Requirements have been added for the design of several types of systems. The requirements are the same for engineers and installer designs, ex: pressure distribution, soil replacement and mound systems, however the changes make it easier to regulate these systems. Jason Maxey commented there were no major changes that affected much of the community and there were no community comments today. A Resolution of Recommendation was recommended for approval by the Board of Public Health. A motion was made by Linda Kautz to recommend approval of the OWTS system code changes to the Board of County Commissioners and Joyce Smock seconded the motion. The motion was carried by unanimous roll call vote. Yes: Jason Maxey, Joyce Smock, Linda Kautz, Jim Rohn, James Kuemmerle, Sandra Owens. PRESENTATIONS No presentations for the month of November 2017. There will be some new presentations coming up for 2018; Food Program, Lab -Water Program, etc.... STAFF DISCUSSION Staff discussion: no hearing in December. Invitation for board members to accompany health department staff on inspections. Update on new director for Environmental Health, Deb Adamson. A motion was made by Joyce Smock to adjourn the meeting. James Kuemmerle seconded the motion, and the motion was carried unanimously. Respectfully submitted, Sandra Monge Environmental Health Services Cheryl Hoffman From: Sent: To: Cc: Subject: Attachments: Cheryl and Esther, Katie Sall Wednesday, January 24, 2018 11:17 AM Esther Gesick; Cheryl Hoffman Lauren Light 3rd Reading OWTS Copy Chapter 30 OWTS Regulations - 3nd Reading Draft 2018 changes incorporated.docx Attached is my 3rd reading draft. This one just had typos, spacing issues and items I fixed for continuity. I didn't track the changes, I just highlighted where I fixed items, because the tracking made it too hard to see where there were issues. You probably already caught these, but in case I got something you didn't, or if you caught something I didn't, let me know. I am hoping our working copy looks exactly the same as the code copy. Thank you! Katie Sall, REHS OWTS Program Coordinator Weld County Department of Public Health and Environment 1555 North 17th Avenue, Greeley, CO 80631 (970)400-2216 ksall@weldgov.com „.; 161..M. I' a i. Pre Confidentiality Notice: This electronic transmission and any attached documents or other writings are intended only for the person or entity to which it is addressed and may contain information that is privileged, confidential or otherwise protected from disclosure. If you have received this communication in error, please immediately notify sender by return e-mail and destroy the communication. Any disclosure, copying, distribution or the taking of any action concerning the contents of this communication or any attachments by anyone other than the named recipient is strictly prohibited. 1 do/7- CHAPTER 30 WELD COUNTY DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT ON -SITE WASTEWATER TREATMENT SYSTEM REGULATIONS TABLE OF CONTENTS ARTICLE I AUTHORITY Sec. 30-1-10. Title Sec. 30-1-20. Jurisdiction, Severability, Savings Clause Sec. 30-1-30. Effective Date ARTICLE II SCOPE AND PURPOSE Sec. 30-2-10. Declaration Sec. 30-2-20. Purpose Sec. 30-2-30. Effluent Discharged to Surface Waters ARTICLE III DEFINITIONS Sec. 30-3-10. Definitions Table 30-3-1 Abbreviations and Acronyms ARTICLE IV ADMINISTRATION AND ENFORCEMENT Sec. 30-4-10. General Sanitation Requirements Sec. 30-4-20. Existing OWTS Review Sec. 30-4-30. Permit Application Requirements and Procedures Sec. 30-4-40. Determination of Compliance of Permit Submission Sec. 30-4-50. Denial of Permit Application Sec. 30-4-60. Access to Site Sec. 30-4-70. Notification and Inspection Stages Sec. 30-4-80. Final Approval of OWTS Permit Sec. 30-4-90. Systems Employing New Technology Sec. 30-4-100. Product Development Permit Sec. 30-4-110. Systems Contractor License Sec. 30-4-120. Regulations of Systems Cleaners Sec. 30-4-130. Variance Procedure Sec. 30-4-140. General Prohibitions Sec. 30-4-150. Prohibition of On -Site Wastewater Treatment Systems in Unsuitable Areas Sec. 30-4-160. Enforcement Sec. 30-4-170. Penalties ARTICLE V SITE AND SOIL EVALUATION Sec. 30-5-10. Site and Soil Evaluation General Requirements Sec. 30-5-20. Preliminary Investigation Sec. 30-5-30. Reconnaissance Sec. 30-5-40. Detailed Soil Investigation Sec. 30-5-50. Marking of Soil Profile Pit Excavations or Percolation Holes Sec. 30-5-60. Report and Site Plan Sec. 30-5-70. Design Document Sec. 30-5-80. Site Protection Sec. 30-5-90. Qualifications for a Competent Technician ARTICLE VI WASTEWATER FLOW AND STRENGTH Sec. 30-6-10. Wastewater Flows Table 30-6-1 Single -Family Residential Design Flows Table 30-6-2 Estimate of Average Daily Wastewater Flow and BOD5 Load Per Person Unless Otherwise Noted Sec. 30-6-20. Wastewater Strength Table 30-6-3 Treatment Levels Table 30-6-4 High Strength Wastewater ARTICLE VII MINIMUM DISTANCES BETWEEN COMPONENTS OF AN ON -SITE WASTEWATER TREATMENT SYSTEM AND PHYSICAL FEATURES Sec. 30-7-10. Minimum Horizontal Distances Sec. 30-7-20. Dry Gulches, Cut Banks and Fill Areas Sec. 30-7-30. On -site Wastewater Treatment System Design Consideration Soil Treatment Area Table 30-7-1 Minimum Horizontal Distances in Feet Between Components of an On -Site Wastewater Treatment System Installed After November 15, 1973 and Water, Physical and Health Impact Features Table 30-7-2 On -site Wastewater Treatment System Design Consideration and Treatment Requirements — Separation Distances from Soil Treatment Area ARTICLE VIII DESIGN CRITERIA -GENERAL Sec. 30-8-10. Performance Sec. 30-8-20. Reliability Sec. 30-8-30. Accessibility for Inspection, Maintenance, and Servicing Sec. 30-8-40. Plumbing Codes Sec. 30-8-50. Electrical Equipment Sec. 30-8-60. Indicators of Failure or Malfunctioning for Systems Utilizing Mechanical Apparatus Sec. 30-8-70. Sampling Access Sec. 30-8-80. Component Operating Instructions Sec. 30-8-90. Surface Activity Sec. 30-8-100. Floodplains Sec. 30-8-110. Business Commercial, Industrial, Institutional or Multi -Family Dwelling Wastewater Systems ARTICLE IX DESIGN CRITERIA -COMPONENTS Sec. 30-9-10. Tanks and Vaults Sec. 30-9-20. Septic Tanks Table 30-9-1 Minimum Septic Tank Size Based on Number of Bedrooms Sec. 30-9-30. Abandonment of Tank Sec. 30-9-40. Pipe Standards and Bedding Requirements Sec. 30-9-50. Cleanouts Sec. 30-9-60. Distribution Box Sec. 30-9-70. Drop Box Sec. 30-9-80. Stepdown/Relief Pipe Sec. 30-9-90. Wastewater Pumping and Dosing Siphon Systems Sec. 30-9-100. Effluent Screens Sec. 30-9-110. Grease Interceptor Tanks ARTICLE X DESIGN CRITERIA -SOIL TREATMENT AREA Sec. 30-10-10. Soil Treatment Area General Sec. 30-10-20. Calculation of Infiltrative Surface of Soil Treatment Area Table 30-10-1 Soil Treatment Area Long-term Acceptance Rates by Soil Texture, Soil Structure, Percolation Rate and Treatment Level Table 30-10-1A Design Criteria for Soils with High Rock Content (Type "R" Soils) 1, 2, 3, 4 Sec. 30-10-30. Allowable Soil Treatment Area Reductions and Increases Table 30-10-2 Size Adjustment Factors for Methods of Application in Soil Treatment Areas Table 30-10-3 Size Adjustment Factors for Types of Distribution Media in Soil Treatment Areas Sec. 30-10-40. Design of Distribution Systems Sec. 30-10-50. Soil Treatment Area Requirements Sec. 30-10-60. Storage/Distribution Media Sec. 30-10-70. Lift Stations Sec. 30-10-80. Soil Replacement Sec. 30-10-90. Repairs ARTICLE XI DESIGN CRITERIA -HIGHER LEVEL TREATMENT SYSTEMS Sec. 30-11-10. General Sec. 30-11-20. Treatment Levels Sec. 30-11-30. Sand Filters Sec. 30-11-40. Mound Systems Sec. 30-11-50. Rock Plant Filter (Constructed Wetland) Treatment Before a Soil Treatment Area ARTICLE XII DESIGN CRITERIA -OTHER FACILITIES Sec. 30-12-10. Evapotranspiration and Evapotranspiration/Absorption Systems Table 30-12-1 Gradation of Wicking Sand for Evapotranspiration Beds Sec. 30-12-20. Vaults other than Vault Privies Sec. 30-12-30. Vault Privies Sec. 30-12-40. Incinerating, Composting and Chemical Toilets Sec. 30-12-50. Treatment Systems Other Than Those Discharging Through a Soil Treatment Area or Sand Filter System ARTICLE XIII OPERATION AND MAINTENANCE Sec. 30-13-10. Responsibility Sec. 13-13-20. Service Label Sec. 30-13-30. Monitoring and Sampling ARTICLE XIV TECHNOLOGY REVIEW AND ACCEPTANCE Sec. 30-14-10 Technology Review and Acceptance ARTICLE XV MATERIALS INCORPORATED BY REFERENCE Sec. 30-15-10 Material Incorporated by Reference Appendix 30-A TEXTURAL TRIANGLE DEFINING TWELVE TEXTURAL CLASSES OF SOIL OF THE USDA Appendix 30-B SOIL CLASSIFICATION SYSTEM (SOIL -SEPARATE SIZE LIMITS) Appendix 30-C ANNUAL FREE WATER SURFACE EVAPORATION MAP OF WELD COUNTY ADAPTED FROM NOAA RR NWS 33 ARTICLE I AUTHORITY Sec. 30-1-10. Title. The Regulations contained herein shall be known as the On -site Wastewater Treatment System Regulations ("Regulations"). Sec. 30-1-20. Jurisdiction, Severability, Savings Clause. A. These Regulations are promulgated by the Weld County Board of County Commissioners under the authority of the Weld County Home Rule Charter, Section 3-8, acting as the Weld County Board of Public Health under authority of the Weld County Home Rule Charter, and upon the recommendation of the advisory Board of Public Health established pursuant to said Charter. The jurisdiction of these Regulations extends to all territories within Weld County including all incorporated and unincorporated areas. B. If any section of these Regulations adopted hereunder or its application to any person or circumstance is held invalid, unconstitutional, void or inoperative, such holding shall not affect other provisions or applications of the ordinance adopted hereunder. The Board of Public Health and the Board of County Commissioners hereby declares that in this regard, the ordinance adopted hereunder is severable, and that said Boards would have adopted the remaining ordinance hereof notwithstanding such holding. C. The repeal of any Regulation adopted hereunder shall not deny any right, action, or cause of action, which arose under existing ordinances. D. The repeal and re-enactment of these Regulations shall not prejudice the prosecution of any violations under previous versions of these Regulations. E. The Board of County Commissioners hereby delegates these duties described herein to the Board of Public Health subject to the rights of appeal as outlined in these Regulations. F. Chapter Coverage: These Regulations adopted by the Weld County Board of Public Health, pursuant to current On -site Wastewater Treatment System Regulations of the Colorado Department of Public Health and Environment, Water Quality Control Commission, Regulation #43 (5 CCR 1002-43) and adopted in compliance with Section 25-10-104, C.R.S., shall govern all aspects of permits, performance, location, construction, alteration, installation, and use of Onsite Wastewater Treatment Systems of less than or equal to 2,000 gallons per day design capacity. Site approval, design review and a discharge permit from the Water Quality Control Division are required for a system with design capacity greater than 2,000 gallons per day average flow. Sec. 30-1-30. Effective Date Upon adoption, the On -site Wastewater Treatment System Regulations shall become effective upon the twelfth day of February, 2018. Until the twelfth day of February, 2018, Chapter 30 Code provisions in effect prior to the changes contained in the On -site Wastewater Treatment System Regulations shall remain in effect. ARTICLE II SCOPE AND PURPOSE Sec. 30-2-10. Declaration. A. In order to preserve the environment and protect the public health and water quality; to eliminate and control causes of disease, infection, and aerosol contamination; and to reduce and control the pollution of the air, land and water, it is declared to be in the public interest to establish minimum standards and regulations for On -site Wastewater Treatment Systems ("OWTS") within the County of Weld and to provide the authority for the administration and enforcement of such minimum standards and regulations. B. This regulation will apply to On -site Wastewater Treatment Systems as defined in Article III of this Chapter. Sec. 30-2-20. Purpose A. The purpose of this regulation as authorized and required by the OWTS Act, Section 25- 10-101, et seq., C.R.S., is to establish minimum standards for the location, design, construction, performance, installation, alteration and use of OWTS within the County of Weld, including but not limited to permit application requirements; requirements for issuing permits; the inspection, testing, and supervision of installed systems; the maintenance and cleaning of systems; transportation and final disposal of sewage materials; the control of systems contractors and systems cleaners of such systems; and issuance of cease and desist orders. This Regulation meets or exceeds the requirements of the regulations adopted by the Colorado Department of Public Health & Environment, Water Quality Control Commission pursuant to Section 25-10-104, C.R.S. Sec. 30-2-30. Effluent Discharged to Surface Waters. A. Any system that will discharge into surface waters must be designed by a professional engineer. The discharge permit application must be submitted for preliminary approval to the Board of Public Health. Once approved by the Board of Public Health, the application must be submitted to the Water Quality Control Division for review in accordance with the Water Quality Control Act, Section 25-8-101, et seq., C.R.S, and all applicable regulations of the Water Quality Control Commission. Compliance with' such a permit will be deemed full compliance with this Regulation. ARTICLE III DEFINITIONS Sec. 30-3-10. Definitions. The following definitions shall apply in the interpretation and enforcement of these Regulations. The words "shall," and "must" as used herein indicates a mandatory requirement. "Absorption system" means a leaching field and adjacent soils or other system for the treatment of sewage in an On -site Wastewater Treatment System by means of absorption into the ground. See Soil treatment area. "Accessible" means easily reached, attained or entered by the necessary equipment or maintenance provider. "Applicant" means a person who submits an application for a permit for an On -site Wastewater Treatment System. 0 6 wr "Basal Area" means the effective surface area available to transmit the treated effluent from tiAtla4 filter media in a mound system into the in -situ receiving soils. The perimeter is measured at the interface of the imported fill material and in -situ soil. On sloping sites, only the area down - gradient from the up -slope edge of the distribution media may be included in this calculation. "Bed" means a below -grade soil treatment area with a level sub -base, consisting of a shallow excavation greater than three feet wide containing distribution media and more than one lateral. "Bedrock" means continuous rock that underlies the soil or is exposed at the surface. Bedrock is generally considered impervious, but if fractured or deteriorated, it may allow effluent to pass through without adequate treatment. "Bedroom" means, a room with an egress window, a closet, and/or is intended for sleeping purposes; or as defined by the local board of health, as stated in the local OWTS regulation. "Biochemical Oxygen Demand, Five -Day" (BOD5) means quantitative measure of the amount of oxygen consumed by bacteria while stabilizing, digesting, or treating biodegradable organic matter under aerobic conditions over a five-day incubation period; expressed in milligrams per liter (mglL). "Biochemical Oxygen Demand, Carbonaceous Five Day" (CBOD5) means quantitative measure of the amount of oxygen consumed by bacteria while stabilizing, digesting, or treating the organic matter under aerobic conditions over a five-day incubation period while in the presence of a chemical inhibitor to block nitrification; expressed in milligrams per liter (mg/L). "Board of Public Health" means the Advisory Board of Public Health as designated by the Board of County Commissioners pursuant to the Home Rule Charter. "Building sewer" means piping that conveys wastewater to the first system component or the sewer main. "Carbonaceous Biochemical Oxygen Demand" See Biochemical Oxygen Demand, Carbonaceous. "Cesspool" means an unlined or partially lined underground pit or underground perforated ceptacle into which raw household wastewater is discharged and from which the liquid seeps into the surrounding soil. Cesspool does not include a septic tank. "Chamber" means an open, arch -shaped structure providing an open -bottom soil interface with permeable sidewalls used for distribution of effluent in a soil absorption system. "Chapter 30" means Chapter 30 of the Weld County Code also known as the On -site Wastewater Treatment System Regulations. "Cistern" means an underground, enclosed, unpressurized reservoir or tank for storing water as part of a potable water supply system. "Cleaning" means the act of removing septage or other wastes from a wastewater treatment system component or grease/waste from a grease interceptor. "Colorado Plumbing Code" means Rules and Regulations of the Colorado State Plumbing Board, (3 CCR 720-1). "Competent technician" means a person who has the appropriate expertise and is able to conduct and interpret the results of soil profile test pit excavations, percolation tests, and site evaluations. This individual has also met the required competencies for a "Competent Technician" as defined in section 30-5-90. "Component" means a subsection of an On -site Wastewater Treatment System; a component may include multiple devices. "Composting toilet" means a self-contained waterless toilet designed to decompose non - water -carried human wastes through microbial action and to store the resulting matter for disposal. "Consistence" means the degree and kind of cohesion and adhesion that soil exhibits and/or the resistance of soil to deformation or rupture under an applied stress to an extent that the soil density would restrict soil permeability. Aspects of consistence are used to determine if the horizon will have permeability lower than that of the defined soil type. Additional insight to consistence can be found in the USDA - NRCS Field book for Describing and Sampling Soils; Version 3.0, Sept. 2012. "Crest" means the highest point on the side of a dry gulch or cut bank. "Cut -bank" means a nearly vertical slope caused by erosion or construction that has exposed historic soil strata. "Deep gravel system" means a soil treatment area for repairs only where the trenches utilize a depth of gravel greater than six (6) inches below the distribution pipe and sidewall area is allowed according to a formula specified in this Regulation. "Deficiency" See Malfunction "Department" means the Weld County Department of Public Health and Environment. "Design" means 1) the process of selecting, sizing, locating, specifying, and configuring treatment train components that match site characteristics and facility use as well as creating the associated written documentation; and 2) written documentation of size, location, specification and configuration of a system. "Design capacity" See Flow, Design. "Design flow" See Flow, Design. "Designer, On -site Wastewater Treatment System" means a practitioner who utilizes site evaluation and investigation information to select an appropriate OWTS and prepares a design document in conformance with this Regulation. "Distribution" means the process of conveying wastewater or effluent to one or more components, devices, or throughout a soil treatment area. "Distribution box" means a watertight component that receives effluent from a septic tank or other treatment unit and distributes effluent via gravity in approximately equal portions to two (2) or more distribution laterals in the soil treatment area. "Division" means the Division of Environmental Health Services, Weld County Department of Public Health and Environment. "Division Representative" See Environmental Health Specialist. "Domestic wastewater" See Wastewater, domestic. "Domestic Wastewater Treatment Works" means a system or facility for treating, neutralizing, stabilizing, or disposing of domestic wastewater which system or facility has a designed capacity to receive more than 2,000 gallons of domestic wastewater per day. The term "domestic wastewater treatment works" also includes appurtenances to such system or facility such as outfall sewers and pumping stations and to equipment related to such appurtenances. The term "domestic wastewater treatment works" does not include industrial wastewater treatment plants or complexes whose primary function is the treatment of industrial wastes, notwithstanding the fact that human wastes generated incidentally to the industrial process are treated therein. Section 25-8-103 (5), C.R.S. "Dosing" means a high rate periodic discharge into a soil treatment area. "Dosing, demand" means configuration in which a specific volume of effluent is delivered to a component based upon patterns of wastewater generation from the source. "Dosing, pressure" means a uniform application of wastewater throughout the intended portion of the soil treatment area through small diameter pipes and orifices, under pressure. For this definition, the term pressure indicates that the system is capable of creating upward movement of effluent out of the distribution system piping. "Dosing, timed" means a configuration in which a specific volume of effluent is delivered to a component based upon a prescribed interval, regardless of facility water use. "Dosing siphon" means a device used for demand dosing effluent; which stores a predetermined volume of water and discharges it at a rapid rate, from a tank at a given elevation to a component at a lower elevation, accomplished by means of atmospheric pressure and the suction created by the weight of the liquid in the conveying pipe. "Dosing tank" means a tank, compartment or basin that provides for storage of effluent from a septic tank or other treatment unit intended to be delivered to a soil treatment area at a high rate periodic discharge. "Drainfield" See Soil treatment area. "Drop box" means a device used for serial or sequential distribution of effluent by gravity flow to a lateral of a soil treatment area. "Dry gulch" See Gulch, dry. "Drywell" means an unlined or partially lined underground pit (regardless of geometry) into which drainage from roofs, basement floors, water softeners or other non -wastewater sources is discharged and from which the liquid seeps into the surrounding soil. "Effective Size" means the size of granular media such that ten percent (10%) by weight of the media is finer than the size specified. "Effluent" means the liquid flowing out of a component or device of an On -site Wastewater Treatment System. "Effluent filter" See Effluent screen. "Effluent pipe" means non -perforated pipe that conveys effluent from one (1) On -site Wastewater Treatment System component to the next. "Effluent screen" means a removable, cleanable (or disposable) device installed on the outlet piping of a septic tank for the purpose of retaining solids larger than a specific size and/or modulating effluent flow rate. An effluent screen may be a component of a pump installation. An effluent screen may also be installed following the septic tank but before higher level treatment components or a soil treatment area. "Environmental Health Specialist" means a person trained in physical, biological, or sanitary science to carry out educational and inspectional duties in the field of environmental health. Also known as Division Representative. "Evapotranspiration/absorption system" means an unlined On -site Wastewater Treatment component that uses evaporation, transpiration, and absorption for dispersal of effluent. "Evapotranspiration system" means an On -site Wastewater Treatment component with a continuous, impermeable liner that uses evapotranspiration and transpiration for dispersal of effluent. "Failure" means a condition existing within any component of an OWTS which prevents the system from functioning as intended, and which results in the discharge of untreated or partially treated wastewater onto the ground surface, into surface water or ground water, or which results in the back-up of sewage into the building sewer. Other conditions within an OWTS component that are deemed by a local public health agency to be a threat to public health and/or safety may also be deemed a failure. "Field performance testing" means data gathering on a system in actual use that is being proposed for Water Quality Control Division acceptance. "Floodplain (100 -year)" means an area adjacent to a stream which is subject to flooding as the result of the occurrence of a one hundred (100) year flood, and is so adverse to past, current or foreseeable construction or land use as to constitute a significant hazard to public or environmental health and safety or to property or is designated by the Federal Emergency Management Agency (FEMA) or National Flood Insurance Program (NFIP). In the absence of FEMA/NFIP maps, a professional engineer must certify the flood plain elevations. "Floodway" means the channel of a river or other watercourse and the adjacent land areas that must be reserved in order to discharge the base flood without cumulatively increasing the water surface elevation more than one-half (1/2) foot (six [6] inches) at any point or as designated by the Federal Emergency Management Agency or National Flood Insurance Program. In the absence of FEMA/NFIP maps, a professional engineer must certify the floodway elevation and location. "Flow, daily" means the measured volume of wastewater generated from a facility in a 24 -hour period expressed as gallons per day. "Flow, design" means the estimated volume of wastewater per unit of time for which a component or system is designed. Design flow may be given in the estimated volume per unit such as person per unit time that must be multiplied by the maximum number of units that a facility can accommodate over that time. "Flow equalization" means a system configuration that includes sufficient effluent storage capacity to allow for regulated flow on a daily or multi -day basis to a subsequent component despite variable flow from the source. "Flow equalizer" means an adjustment device to evenly distribute flow between outlets in a distribution box or other device that may be out of level. "Grease interceptor tank" means a watertight device located outside a facility designed to intercept, congeal, and retain or remove fats, oils, and grease from sources such as commercial food -service that will generate high levels of fats, oils and greases. "Ground water" means that part of the subsurface water that is at or below the saturated zone. "Ground water surface" means the uppermost limit of an unconfined aquifer at atmospheric pressure. "Guidelines" means State Board of Health Guidelines on Individual Sewage Disposal Systems, 5 OCR 1003-6, which are the predecessor of Regulation 43, On -site Wastewater Treatment System Regulations, 5 CCR 1002-43. "Gulch, dry" means a deep, narrow ravine marking the course of an intermittent or ephemeral stream. "Health Officer" means the Director of the Weld County Department of Public Health and Environment, or other representative as designated by the Board of County Commissioners of Weld County. "Higher level treatment" means designated treatment levels other than treatment level 1.(See table 30-6-3) "Holding tank" See "vault" "Individual Sewage Disposal System" means a term used for On -site Wastewater Treatment System in Colorado Regulations from 1973 until 2013. "Infiltrative surface" means designated interface where effluent moves from distribution media or a distribution product into treatment media or original soil. In standard trench or bed systems this will be the interface of the distribution media or product and in -situ soil. Two separate infiltrative surfaces will exist in a mound system and an unlined sand filter; one at the interface of the distribution media and fill sand, the other at the interface of the fill sand and in -situ soil. "Inspection port" means an access point in a system component that enables inspection, operation and/or maintenance. "Invert" means elevation of the bottom of the inside pipe wall or fitting. "Lateral" means a pipe, chamber or other conveyance used to carry and distribute effluent. "Leach field" See Soil treatment area. "Lift Station" means a device used for the vertical lifting of sewage or effluent to the required horizontal level of either the septic tank or soil treatment area. "Limiting layer" means a horizon or condition in the soil profile or underlying strata that limits the treatment capability of the soil or severely restricts the movement of fluids. This may include soils with low or high permeability, impervious or fractured bedrock, or a seasonal or current ground water surface. "Linear Loading Rate" (gpd/Iinear ft.). means the amount of effluent applied per linear foot along the contour "Liner" means an impermeable synthetic or natural material used to prevent or restrict infiltration and/or exfiltration. For the purposes of this regulation, the minimum thickness of a liner must be 30 ml. "Long -Term Acceptance Rate" (LIAR) means a design parameter expressing the rate that effluent enters the infiltrative surface of the soil treatment area at equilibrium, measured in volume per area per time, e.g. gallons per square foot per day (gal/ ft2/day). "Malfunction" means the condition in which a component is not performing as designed or installed and is in need of repair in order to function as originally intended. "Manufactured media" See Media, other manufactured. "Media" means solid material that can be described by shape, dimensions, surface area, void space, and application. "Media, Enhanced Manufactured" means an accepted proprietary manufactured distribution product, other than a chamber, wrapped in a specified fabric, and placed on a specified sand base or media that does not mask the infiltrative surface of the in -situ soil. "Media, other manufactured" means an accepted proprietary manufactured distribution product made of synthetic media for distribution of effluent that is placed directly on the in -situ soil. dAtAr rot/ "Media, treatment" means non -or slowly -degradable media used for physical, chemical, and/or biological treatment in an On -site Wastewater Treatment System component. "Mound" means a soil treatment area whereby the infiltrative surface is at or above original grade at any point "Nitrogen reduction" means a minimum 50 percent reduction of influent nitrogen strength which is the minimum objective of NSF/ANSI Standard 245 - Wastewater Treatment Systems - Nitrogen Reduction. "On -Site Wastewater Treatment System" or "OWTS" and, where the context so indicates, the term "system" means an absorption system of any size or flow or a system or facility for treating, neutralizing, stabilizing, or dispersing sewage generated in the vicinity, which system is not a part of or connected to a sewage treatment works. "Owner" means the person who is owner of record of the land on which an On -site Wastewater Treatment System is to be designed, constructed, installed, altered, or used. "OWTS Act" means the On -site Wastewater Treatment System Act, Section 25-10-101, et seq. C.R.S. "Percolation test" means a subsurface soil test at the depth of a proposed absorption system or similar component of an OWTS to determine the water absorption capability of the soil, the results of which are normally expressed as the rate at which one inch of water is absorbed. The rate is expressed in minutes per inch. "Performance standard" means minimum performance criteria for water quality and operation and maintenance established by the regulatory authority to ensure compliance with the public health and environmental goals of the state or the Division. "Permeability" means the property of a material which permits movement of water through the material. "Permit" means a permit, issued by the Division, authorizing the construction or alteration, installation, and use or for the repair of an On -site Wastewater Treatment System. "Person" means an individual, partnership, firm, corporation, association, or other legal entity and also the state, any political subdivision thereof, or other governmental entity. "Pressure distribution" See "Dosing, pressure" "Privy" means an above grade structure allowing for the disposal of excreta not transported by a sewer and which provides privacy and shelter and prevents access to the excreta by flies, rodents, or other vectors. 1. Pit privy — privy over an unlined excavation. 2. Vault privy — privy over a vault. "Professional engineer" means an engineer licensed in accordance with Section 12-25-101, et seq., C.R.S. "Professional geologist" means a person who is a graduate of an institution of higher education which is accredited by a regional or national accrediting agency, with a minimum of thirty semester (forty-five quarter) hours of undergraduate or graduate work in a field of geology and whose post - baccalaureate training has been in the field of geology with a specific record of an additional five years of geological experience to include no more than two years of graduate work. Section 23- 41-208, C.R.S., and Section 34-1-201, C.R.S. "Proprietary product" means a manufactured component or other product that is produced by a private person. It may be protected by patent, trademark or copyright. "Public domain technology" means a system that is assembled on location from readily available components and is based on well -established design criteria and is not protected by patent, trademark or copyright. "Record Drawing" means construction drawings provided to illustrate the progress or completion of the installation of an OWTS, or components of the OWTS; typically based on field inspections by the designer or local public health agency. "Redoximorphic" means a soil property that results from the reduction and oxidation of iron and manganese compounds in the soil after saturation with water and subsequent desaturation. "Remediation system" means a treatment system, chemical/biological additive or physical process that is proposed to restore the soil treatment area of an OWTS to intended performance. "Repair" means restoration of functionality and/or treatment by reconstruction, relocation, or replacement of an on -site sewage wastewater treatment system or any component thereof in order to allow the system to function as intended. "Replacement System" See "Repair" "Riser" means a watertight vertical cylinder and lid allowing access to an OWTS component for inspection, cleaning, maintenance, or sampling. "Rock -plant filter" means a designed system which utilizes treatment media and various wetland plants to provide treatment of wastewater through biological, physical, and chemical processes. Also called a constructed wetland. "Sand filter" means an engineered designed OWTS that utilizes a layer of specified sand as filter and treatment media and incorporates pressure distribution. "Sand filter, lined" means an engineered designed OWTS that has an impervious liner and under -drain below the specified sand media. Lined sand filters may be intermittent / single pass where the effluent is distributed over the sand bed a single time before distribution to a soil treatment area, or recirculating where part of the effluent is returned to an earlier component for additional treatment before distribution to a soil treatment area. "Sand filter, unlined" means an engineered designed OWTS that includes a layer of specified sand used as a treatment media without a liner between the sand and the existing soil on which it is placed. "Seepage pit" means an excavation deeper than it is wide that receives septic tank effluent and from which the effluent seeps from a structural internal void into the surrounding soil through the bottom and openings in the side of the pit. "Septage" means a liquid or semisolid that includes normal household wastes, human excreta, and animal or vegetable matter in suspension or solution generated from a residential septic tank system. Septage may include such material issued from a commercial establishment if the commercial establishment can demonstrate to the Division that the material meets the definition of septage set forth in the preceding sentence. "Septic tank" means a watertight, accessible, covered receptacle designed and constructed to receive sewage from a building sewer, settle solids from the liquid, digest organic matter, store digested solids through a period of retention, and allow the clarified liquids to discharge to other treatment units for final disposal. "Sequential distribution" means a distribution method in which effluent is loaded into one (1) trench and fills it to a predetermined level before passing through a relief pipe or device to the succeeding trench. The effluent does not pass through the distribution media before it enters succeeding trenches. "Serial distribution" means a distribution method in which effluent is loaded into one (1) trench and fills it to a predetermined level before passing through a relief pipe or device to the succeeding trench. The effluent passes through the distribution media before entering succeeding trenches which may be connected to provide a single uninterrupted flow path. "Sewage" means a combination of liquid wastes that may include chemicals, house wastes, human excreta, animal or vegetable matter in suspension or solution, and other solids in suspension or solution, and that is discharged from a dwelling, building, or other establishment. See also Wastewater. "Sewage treatment works" has the same meaning as "domestic wastewater treatment works" under Section 25-8-103, C.R.S. "Site evaluation" means a comprehensive analysis of soil and site conditions for an OWTS. "Site evaluator" means a practitioner who conducts preconstruction site evaluations, including visiting a site and performing soil analysis, a site survey, or other activities necessary to determine the suitability of a site for an OWTS. "Slit trench latrine" means a temporary shallow trench for use as disposal of non -water -carried human waste. "Soil" means 1. unconsolidated mineral and/or organic material on the immediate surface of the earth that serves as a medium for the growth of plants and can potentially treat wastewater effluent; 2. unconsolidated mineral or organic matter on the surface of the earth that has been subjected to and shows effects of: a) pedogenic and environmental factors of climate (including water and temperature effects) and b) macro and microorganisms, conditioned by relief, acting on parent material over a period of time. "Soil evaluation" means a percolation test, soil profile, or other subsurface soil analysis at the depth of a proposed soil treatment area or similar component or system to determine the water absorption capability of the soil, the results of which are normally expressed as the rate at which one inch of water is absorbed or as an application rate of gallons per square foot per day. "Soil horizon" means layers in the soil column differentiated by changes in texture, color, redoximorphic features, bedrock, structure, consistence, and any other characteristic that affects water movement or treatment of effluent. "Soil morphology" means 1) physical constitution of a soil profile as exhibited by the kinds, thickness, and arrangement of the horizons in the profile; and by the texture, structure, consistence, and porosity of each horizon; and 2) visible characteristics of the soil or any of its parts. "Soil profile test pit excavation" means a trench or other excavation used for access to evaluate the soil horizons for properties influencing effluent movement, bedrock, evidence of seasonal high ground water, and other information to be used in locating and designing an On - site Wastewater Treatment System. "Soil structure" means the naturally occurring combination or arrangement of primary soil particles into secondary units or pods; secondary units are characterized on the basis of shape, size class, and grade (degree of distinctness). "Soil texture" means proportion by weight of sand, silt, and clay in a soil. "Soil treatment area" means the physical location where final treatment and dispersal of effluent occurs. Soil treatment area includes drainfields, mounds and drip fields. "Soil treatment area, alternating" means final treatment and distribution component that is composed of two soil treatment areas that are independently dosed. "Soil treatment area, sequencing" means a soil treatment area having more than two sections that are dosed on a frequent rotating basis. "State Waters" means any and all surface and subsurface waters which are contained in or flow in or through this state, but does not include waters in sewage systems waters in treatment works of disposal systems, waters in potable water distribution systems, and all water withdrawn for use until use and treatment have been completed. Section 25-8-103 (19) C.R.S. "Strength, wastewater" means the concentration of constituents of wastewater or effluent; usually expressed in mg/L. "Suitable soil" means a soil which will effectively treat and filter effluent by removal of organisms and suspended solids which meets long-term acceptance rate requirements as defined in Table 30-10-1, and has the required vertical thickness below the infiltrative surface and above a limiting layer." "Systems cleaner" means a person engaged in and who holds himself or herself out as a specialist in the cleaning and pumping of On -site Wastewater Treatment Systems and removal of the residues deposited in the operation thereof. "Systems contractor" means a person engaged in and who holds himself or herself out as a specialist in the installation, renovation, and repair of On -site Wastewater Treatment Systems. "Total suspended solids" means measure of all suspended solids in a liquid; typically expressed in mg/L. "Transfer of Title" means change of ownership of a property. "Treatment level" means defined concentrations of pollutants to be achieved by a component or series of components of an OVVTS. "Treatment media" See Media, treatment. " Treatment unit" means a component or series of components where solids or pollutants are removed from wastewater or effluent from a preceding component. "Trench" means 1) below -grade soil treatment area consisting of a shallow excavation with a width of 3 feet or less containing distribution media and one lateral; and 2) excavation for placement of piping or installation of electrical wire or conduit. "Uniformity coefficient" means a value which is the ratio of D60 to D10 where D60 is the soil diameter of which 60 percent of the soil weight is finer and D10 is the corresponding value at 10 percent finer. (A soil having a uniformity coefficient smaller than 4 would be considered "uniform" for purposes of this Regulation.) "Vault" means a watertight, covered receptacle, which is designed to receive and store excreta or wastes either from a building sewer or from a privy and is accessible for the periodic removal of its contents. If the vault is intended to serve a structure or structures that are projected to generate a domestic wastewater flow of two thousand gallons per day or more at full occupancy, the vault is a domestic wastewater treatment works. Vaults are On -site Wastewater Treatment Systems. "Visual and tactile evaluation of soil" means determining the properties of soil by standardized tests of appearance and manipulation in the hand. "Volume, effective" means the amount of effluent contained in a tank under normal operating conditions; for a septic tank, effective volume is determined relative to the invert of the outlet. For a dosing tank, the effective volume under normal conditions is determined relative to the invert of the inlet and the control off level. "Wastewater, domestic" means combination of liquid wastes (sewage) which may include chemicals, household wastes, human excreta, animal or vegetable matter in suspension or solution, or other solids in suspension or solution which are discharged from a dwelling, building or other structure. "Wastewater, high strength" means 1. Wastewater from a structure having BOD5 greater than 300 mg/L; and/or TSS greater than 200 mg/L; and/or fats, oils, and grease greater than 50 mg/L; or 2. Effluent from a septic tank or other pretreatment component (as defined by NSF/ANSI Standard 40 testing protocol) that has BOD5 greater than 180 mg/L; and/or TSS greater than 80 mg/L; and/or fats, oils, and grease greater than 25 mg/L and is applied to an infiltrative surface. "Wastewater pond" means a designed pond which receives exclusively domestic wastewater from a septic tank and which provides an additional degree of treatment. "Water Quality Control Commission" State of Colorado Commission created by Section 25-8- 201, C.R.S. "Water Quality Control Division" means the division of the Colorado Department of Public Health and Environment. "Wetland, constructed" See Rock -plant filter. "Wetlands" means those areas that are inundated or saturated by surface or groundwater at a frequency and duration sufficient to support, and that under normal circumstances do support, a prevalence of vegetation typically adapted for life in saturated soil conditions. Wetlands generally include swamps, marshes, bogs and similar areas. Table 30-3-1 Abbreviations and Acronyms AASHTO American Officials Association of State Highway and Transportation ANSI American National Standards Institute ASTM American Society for and Materials Testing BOD Biochemical Oxygen Demand C.R.S. Colorado Revised Statutes CBOD Carbonaceous Biochemical Oxygen Demand CSA Canadian Standards Association gpd gallons per day IAPMO International Association of Plumbing and Mechanical Officials ISDS Individual Sewage Disposal System LTAR Long-term Acceptance Rate mg/L milligrams per Liter MPI Minutes Per Inch NAWT National Association of Wastewater Technicians NDDS Non -pressurized Drip Dispersal System NPCA National Precast Concrete Association NSF National Sanitation Foundation OWTS On -site Wastewater System(s) Treatment STA Soil Area Treatment TL Treatment Level TN Total Nitrogen TSS Total Suspended Solids UL Underwriters' Laboratories ARTICLE IV ADMINISTRATION AND ENFORCEMENT Sec. 30-4-10. General Sanitation Requirements. A. The owner of any structure where people live, work, or congregate shall ensure that the structure contains an adequate, convenient, sanitary toilet and sewage system in good working order. Under no condition shall sewage or effluent be permitted to be discharged upon the surface of the ground, or into State Waters, unless the sewage or effluent meets the minimum requirements of these Regulations or the water quality standards of the Colorado Water Quality Control Commission, whichever are applicable. Any person who is aware of a malfunctioning OWTS is encouraged to report the location of the system to the Division. Sec. 30-4-20. Existing OWTS Review. A. In the case of an existing OWTS, which was installed and exists without a permit, certain circumstances, including but not limited to, a referral from the Department of Planning Services, may require evaluation to assure compliance with these Regulations. The owner of the property shall certify in written form the size of the tank in gallons and the absorption field in square feet, and provide a drawing showing the location and dimensions of the existing OWTS, as it exists at the time of review. B. The owner shall provide a pumping receipt from a Weld County licensed systems cleaner, a tank inspection report for evaluation of existing systems for loan approval inspections and any other inspections deemed necessary by the Division. The tank must have been inspected and pumped within the last two (2) years of the existing system evaluation request. Sec. 30-4-30. Permit Application Requirements and Procedures. A. Prior to installing, altering, or repairing a system, the applicant must obtain a permit from the Division. B. An applicant must submit a complete application that is consistent with Section 30-4-40. to the Division prior to installing, altering or repairing a system. C. Minimum Permit Application Requirements: 1. Owner name and contact information; 2. Applicant's name and contact information; 3. Property address; 4. Parcel Identification Number; 5. Property legal description; 6. Type of permit; 7. Lot size, in acres; 8. Type of building use; 9. Type of water supply; 10. The owner's signature or agent with written permission to sign for the owner; 11. Directions to the property; 12. Report from Site and Soil Evaluation (see ARTICLE V); 13. System design with a legible, accurate site plan which shows pertinent physical features on subject property, and on adjacent properties, as noted in Table 30-7-1; and 14. Other information, data, plans, specifications and tests as required by the Division, including, but not limited to: a. Additional Evaluation: When the Division Representative has determined that the Division does not have sufficient information for evaluation of an application or a system, the Division Representative may require additional tests or documentation. b. Additional Hydrological, Geological or Engineering: When specific evidence suggests undesirable soil conditions exist, additional hydrological, geological, engineering or other information provided by a professional engineer or geologist may be required to be submitted by the applicant. This requirement will not prejudice the right of the Division to develop its own information from its own sources. c. Any expenses associated with additional information, data, plans, specifications and tests shall be the responsibility of the party obtaining the permit. D. After receiving an application for an OWTS permit, the application shall be reviewed by the Division and an inspection shall be made by the Environmental Health Specialist consisting of: 1. Inspection of the premises, unless previously inspected; 2. An assessment of the general topographical conditions; 3. A preliminary assessment as to the suitability of the site and of the proposed system design based upon verification of the ground water table, suitable soil, depth to bedrock, ground slope and pertinent physical features such as the location of the OWTS with reference to wells, streams, lakes, ditches, structures, and other geographical features; E. Permit Fees 1. A permit fee, as set by the Board of Weld County Commissioners, shall be required of applicants for the installation, alteration or repair of an OWTS, payable at the time the application is received. Permit fees are non-refundable except as specifically provided in E.3. of this Section. Permit applications are non -transferable. The issuance of a permit does not denote approval of any zoning subdivision or building code requirements. 2. The Weld County Board of Public Health and/or the Division, may make provision for the waiver of any permit fee normally required for an OWTS. 3. Fee Refunds: a. The Division may authorize the refunding of any fee paid which was erroneously paid or collected. b The Division shall not authorize the refunding of any fee paid except upon written request filed by the original permittee. F. Other Fees 1. Re -Inspection Fee - The Division may assess a re -inspection fee as established by the Board of County Commissioners for each inspection or re -inspection when such portion of work for which inspection is called is not complete or when corrections called for are not ready. 2. Surcharge - The Division must collect a fee of twenty-three dollars ($23.00) for each permit issued for a new, repaired, or upgraded OWTS. Of that fee, the Division must retain three dollars ($3.00) to cover the Division's administrative costs and twenty dollars ($20.00) must be transmitted to the state treasurer, who must deposit that sum in the water quality control fund created in Section 25-8-502(1)(c), C.R.S G. Permit Term. 1. If both a building permit and an OWTS permit are issued for the same property, and construction is not commenced prior to the expiration date of the building permit, the OWTS permit shall expire at the same time as the building permit. If an OWTS permit is issued for property on which no building permit is required, the OWTS permit shall expire one year after the permit's issuance, if construction is not commenced. 2. Any change in plans or specifications after the permit has been issued invalidates the permit unless written approval is secured from the Division Representative for such changes. Expired permits can only be renewed by payment of the permit fee and only if there has been no change in the plans and specifications of the proposed system as set out in the original application; or such change is reviewed and approved by a Division Representative. H. Repair Permit 1. The Division may issue a repair permit and an emergency use permit to the owner or occupant of property on which a system is not functioning properly. Application for a repair permit shall be made by such owner or occupant to the Division within two business days after receiving notice that the system is not functioning in compliance with the OWTS Act, or applicable sections of these Regulations adopted thereunder, or otherwise constitutes a nuisance or a hazard to public health. 2. The permit shall provide for a reasonable period of time within which repairs shall be made. At the end of that period the system shall be inspected by this Division to ensure it is functioning properly. Concurrently with the issuance of a repair permit, the Division may issue an emergency use permit authorizing continued use of a malfunctioning system on an emergency basis for a period not to exceed the period stated in the repair permit. Such an emergency use permit may be extended, for good cause shown, in the event repairs may not be completed in the period stated in the repair permit through no fault of the owner or occupant and only if the owner or occupant will continue to make repairs to the system. I. A permit must be required for the expanded use of an OWTS. The OWTS must be replaced or modified to handle the increased design flow unless it is determined that the existing system is adequately designed and constructed for the higher design flow rate. J. The issuance of a permit and specifications of terms and conditions therein will not constitute assumption of liability, nor create a presumption that Weld County or its officers, employees or agents may be liable for the failure or malfunctioning of any system. Permit issuance will not constitute a certification that the system, the equipment used in the system, or any component used for system operation will ensure continuous compliance with the provision of the OWTS Act, applicable sections of these Regulations adopted thereunder, or any terms and conditions of a permit. K. No OWTS permit shall be issued to any person when the subject property is located within a municipality or special district that provides public sewer service, except where such sewer service to the property is not feasible in the determination of the municipality or special district, or the permit is otherwise authorized by the municipality or special district. Sec. 30-4-40. Determination of Compliance of Permit Submission. A. A determination shall be made by an Environmental Health Specialist after review of the application, site and soils evaluations, assumptions and calculations, design of the proposed OWTS test results, and other required information, whether the proposed system is in compliance with the requirements of these Regulations and the OWTS Act and any other applicable rules and regulations adopted thereunder. A permit may be issued by the Division Representative if the proposed system is determined to be in compliance with the requirements of these Regulations and the OWTS Act and any other applicable rules and regulations adopted thereunder. B. After reviewing all required information, the Division may give conditional approval for a permit for the proposed OVVT, or it may recommend disapproval of the application and denial of the permit if the proposed system cannot be made to comply with these Regulations and the OVVTS Act and any other applicable rules and regulations adopted thereunder. Written notice of the denial of a permit or disapproval of plans shall be served upon the applicant as provided by the Colorado Rules of Civil Procedure or by certified mail, return receipt requested. Service by mail shall be complete upon receipt by the Division of the return receipt. Any applicant whose permit application has been denied may request review of the application by the Board of Public Health as provided in Section 30-4-50. The conditional approval shall set forth conditions precedent to the issuance of a permit including effluent testing, cleaning or maintenance schedules, or other special conditions. No permit shall be issued to the applicant or to a subsequent owner until the conditions have been met. C. No permits shall be issued for the following systems unless they are designed by a professional engineer, and until they have been reviewed and approved by the Board of Public Health: 1. Product Development Permits; 2. Treatment systems other than those discharging through a soil treatment area or a sand filter system. Sec. 30-4-50. Denial of Permit Application. A. Any applicant whose permit application has been denied by the Division may request review of the application by the Board of Public Health. B. A request for review shall be made within sixty (60) days after denial. C. The applicant shall bear the burden of supplying the Board of Public Health with sufficient evidence to document that the denied system will be constructed and used in such a manner as to comply with the declaration and intent of these Regulations and all applicable state and local rules and regulations and required terms and conditions in any permit pursuant thereto. D. Should the Board of Public Health deny an appeal under this Section 30-4-50, the applicant shall have the right to appeal such decision to the Weld County Board of County Commissioners pursuant to Section 3-8(4)(n) of the Weld County Home Rule Charter and the procedures promulgated thereunder. Sec. 30-4-60. Access to Site. For the purpose of inspecting and enforcing applicable regulations and the terms and conditions of any permit issued and investigating and responding to complaints, the Division is authorized to enter upon private property at reasonable times and upon reasonable notice for the purpose of determining whether or not an operating OWTS is functioning in compliance with the OWTS Act and applicable regulations adopted pursuant thereto and the terms and conditions of any permit issued and to inspect and conduct tests in evaluating any permit application. The owner or occupant of every property having an OVVTS must permit the access to the property to make inspections, conduct required tests, take samples, and monitor compliance. If access is denied, the Division Representative may apply to the District Court for an order authorizing entry. Sec. 30-4-70. Notification and Inspection Stages. A. When construction of an OWTS has been completed, the system contractor or owner shall notify the Division, and a representative of the Division shall make a final inspection within seventy-two (72) hours, or at an agreed time, after receipt of notice, Saturdays, Sundays, and holidays excepted. B. If upon final inspection of the system, the Environmental Health Specialist finds the system installed in accordance with these Regulations and the permit, the Environmental Health Specialist shall issue final approval for the completed system. If the system was required to be designed by or constructed under the supervision of a professional engineer, the Division shall require the engineer to certify, in writing, to the Division that construction and installation of the system has been completed in accordance with the terms of the permit and these Regulations. If the inspection discloses any significant departure from the description or design of the system as stated in the application and permit, or if any aspect of the system fails to comply with these Regulations, approval shall be withheld. Written notice of deficiencies causing the disapproval shall be given to the system contractor or owner. A subsequent inspection shall be made upon notification from the system contractor or owner that the deficiencies have been corrected and the system has been brought into compliance with these Regulations. Sec. 30-4-80. Final Approval of OWTS Permit. A. Final approval of the OWTS permit by the Division must include, but is not limited to: 1. Receipt of letter from the professional engineer certifying construction of the OWTS as per the approved design, if the OWTS was engineer -designed; 2. Receipt of a record drawing which includes a scale drawing showing all components of the OWTS, including their location from known and findable points, dimensions, depths, sizes, manufacturers' names and models as available, and other information relative to locating and maintaining the OWTS components. 3. Final inspection prior to backfilling the OWTS by the Division confirming that it was installed according to the permit requirements and regulations or variances to the regulations; and 4. Identification of systems contractor. Sec. 30-4-90. Systems Employing New Technology. Systems employing new technology may be considered by the Division provided they have been reviewed and accepted by the Water Quality Control Division according to Section 43.13 of On -site Wastewater Treatment System Regulation #43, as adopted in 2017. The Division prohibits the reduction of system size, or the reduction in vertical or horizontal separation when higher level treatment systems are used. Sec. 30-4-100. Product Development Permit A. For products that have not received Colorado Water Quality Control Division acceptance, the manufacturer may apply to the local public health agency for a product development permit. Requirements for proprietary treatment component acceptance are in Regulation 43-5 CCR 1002-43. The Division prohibits the reduction of system size, or the reduction in vertical or horizontal separation when higher level treatment systems are used. B. For products or types of systems which have not been otherwise accepted by the Colorado Water Quality Control Division pursuant to section 43.13.D of Regulation 43, the Board of Public Health may approve an application for product development permit only if the system has been designed by a professional engineer, and only if the application provides proof of the ability to install a replacement OVVTS in compliance with all local requirements in a timely manner in the event of a failure or malfunction of the system installed. C. Before a product development permit is issued, the Water Quality Control Division must determine that the product to be tested qualifies for testing under the product development evaluation based on information submitted to the Division. 1. Applicant must provide evidence of nationally accepted third -party testing of the product to be evaluated, or 2. Provide test data from multiple single-family homes under normal working conditions that meet the following criteria: a. Test data must be provided from a minimum of four sites. b. Each system must be tested over a period of at least one year. c. Each system must be sampled at least three times during the year with at least one sample obtained during cold weather conditions. d. Laboratory results for all parameters for which acceptance is being requested must be submitted. D. The board of health must not arbitrarily deny any person the right to consideration of an application for such a system and must apply reasonable performance standards in determining whether to approve such an application; 25-10-108 (2), C.R.S. E. A completed application for a product development permit must be submitted to the Division at least 30 days in advance of installation of the product. F. An application for a product development permit must include the following: 1. Proof of the ability to install a replacement OVVTS in compliance with all local requirements in a timely manner in the event of a failure or malfunction of the system under testing; 2. A description of the product under development including performance goals; and 3. Documentation signed by the owner of the proposed product development site allowing access to the local public health agency and Division for inspection of the site. 4. Design documents as required in section 30-5-70 of this regulation. G. Other than the performance standards identified in section 30-4-100 C. 2 above, the division may stipulate additional requirements for the product development permit necessary to ensure that the system performs as intended. H. A product development permit is a site -specific permit. Product development testing at multiple sites requires a product development permit for each site. I. During the term of the product development permit, all data collected is to be submitted to the Water Quality Control Division and the Division. J. The Division may revoke or amend a product development permit, if the continued operation or presence of the product under development: 1. Presents a risk to the public health or environment; 2. Causes adverse effects on the proper function of the OWTS on the site; 3. Leaks or discharges effluent on the surface of the ground; or 4. If the developer of the product fails to comply with any requirements stipulated on the permit by the Division or the Water Quality Control Division. K. If the product development permit is revoked, the product developer must install the replacement system. L. Once the system is installed and approved, the Division must supply the Water Quality Control Division with a copy of the completed OWTS permit. M. The Division prohibits the reduction of system size, or the reduction in vertical or horizontal separation when higher level treatment systems are used. Sec. 30-4-110. Systems Contractor License. A. No person, except as in Section 30-4-110.B below, shall install, engage in the installation of, or repair an OWTS unless such person holds a valid systems contractor license issued by the Division. Employees of a validly licensed Systems Contractor shall not be required to be licensed. The initial fee for a systems contractor license shall be set by separate Chapter of the Board of Weld County Commissioners. A license shall expire on December 31 of each year, and shall be renewed within thirty (30) days prior thereto, and an annual renewal fee, as set by separate Chapter of the Board of Weld County Commissioners, shall be charged. A license which lapses because of failure to renew or is revoked shall be subject to the fee established for a new license upon re -application. S. Any owner of record shall be entitled to install one OWTS per year for his own private use under the terms and conditions of the permit. A system contractor license shall not be required for owner -installers who have obtained permits in accordance with these regulations. However, owner -installers shall be responsible for complying with all other applicable requirements of these regulations, including but not limited to, assuring that all required inspections are scheduled with, and performed by the Division Representative. C. Standard of performance required for holders of system contractor licenses. 1. Application for systems contractors licenses or renewals shall be made upon forms supplied by the Division. 2. Prior to the issuance or renewal of a license, the Division Representative may require the applicant to demonstrate adequate knowledge of these Regulations. 3. Installation, renovation or repair of any OWTS shall be in compliance with these Regulations and with the conditions set out in the installation permit. 4. Notice of a requested inspection shall be given by the license holder not less than twenty-four (24) hours before the inspection is to be made. 5. The license holder shall ensure that a permit has been issued before installation of a system has begun. D. Revocation of License. 1. A license may be revoked for failure to comply with these Regulations or for other good cause shown above. Revocation shall take place only after a hearing before the Board of Public Health. The license holder shall be given not less than ten (10) days notice of the hearing and may be represented at the hearing by counsel. 2. Written notice of revocation explaining the violations shall be served upon the holder of the systems contractor license. Service of notice as required in this Section shall be as provided by the Colorado Rules of Civil Procedure, or by registered or certified mail, return receipt requested, deliverable to the addressee only. 3. A person who has previously had a systems contractor license revoked may be denied issuance of a new license by the Board of Public Health. Sec. 30-4-120. Reg u lati r ns of Systems Cleaners. A. No person shall engage in the cleaning of sewage treatment works and On -site Wastewater Treatment Systems or the transportation of septage to a disposal site unless such person holds a valid systems cleaner license issued by the Division. Employees of a validly licensed systems cleaner shall not be required to be licensed. The initial fee for a systems cleaner license shall be as set by separate Chapter by the Board of Weld County Commissioners. Licenses shall expire on December 31 of each year and an annual renewal fee as set by separate Chapter by the Board of Weld County Commissioners, shall be charged. A license which lapses because of failure to renew or is revoked shall be subject to the fee established for a new license upon re -application. B. Standard of Performance for Systems Cleaners. 1. A license holder, when cleaning a septic tank or aeration plant, shall remove the liquid, solids, and scum, leaving no more than three (3) inches depth of storage in a non- backflowing septic tank or aeration plant. In backflowing types of systems, cleaning shall be effective in reducing solids and scum to the point of a near new system. 2. License holders shall maintain their equipment so as to ensure that no spillage of septage will occur during transportation, and that their employees are not subjected to undue health hazards. 3. A licensed holder shall dispose of the collected septage only by the following methods: a. By disposal in a municipal sewage treatment collection system by agreement and approval of the plant manager or responsible party. b. By disposal at a site permitted and approved by the Weld County Board of Public Health in accordance with Chapter 14 of the Weld County Code pertaining to land application of septage, specifically Chapter 14, Article 6. c. The licensed systems cleaner shall provide the Division a list of the locations and legal descriptions of all disposal sites utilized for each load transported. This shall be provided monthly except for septage that is land applied. Septage which is land applied shall meet the requirements of Chapter 14, Article 6 of the Weld County Code. d. Prior to the issuance of or renewal of a license, the Division Representative may require the applicant to demonstrate adequate knowledge of Sections 30-4-120.A and B. C. Revocation of a Systems Cleaner License: 1. The procedures described in Section 30-4-110.D. shall be followed for the revocation of a license. Sec. 30-4-130. Variance Procedure. A. General The Division may set fees for processing an OWTS permit with a variance in accordance with the provisions of Title 25, Article 10, C.R.S. This permit fee may be the standard OWTS permit fee or may be a separate fee based upon the cost of processing a permit with a variance. B. Requirements for Variance Consideration. 1. The Weld County Board of Public Health must hear variance cases and approval of a variance requires a majority vote. 2. Prior to the rendering of a decision on a variance request, a public hearing must be held. The hearing shall be the subject of a public notice or notice shall be sent via certified mail, with a minimum twenty (20) day reply time from the date of mailing, to all adjacent property owners. The applicant may submit a signed and dated statement of acknowledgment of variance from all adjacent property owners in lieu of posting or mailing. 3. Requests must be accompanied by: a. Site specific request identifying the specific criteria from which a variance is being requested. b. Technical justification by a professional engineer or professional geologist, which indicates the specific conditions which exist and/or the measures which will be taken to result in no greater risk than that associated with compliance with the requirements of the regulation. Examples of conditions which exist, or measures which might be taken, include but are not limited to the following: evidence of a natural or manmade physical barrier to the movement of effluent to or towards the feature from which the variance is requested; placement of a manmade physical barrier to the movement of effluent to or toward the feature from which the variance is requested; soil amendment or replacement with sand filter media to reduce the infiltration rate of the effluent such that the travel time of the effluent from the absorption field to the physical feature is no less than the travel time through the native soils at the prescribed setback; and treatment equivalent to Treatment Level 2. c. A discussion of alternatives considered in lieu of the requested variance; d. Technical support for selected alternative, which may include a testing program, which confirms that the variance does not increase the risk to public health and to the environment; and e. A statement of the hardship, which creates the necessity for the variance. 4 The applicant has the burden of proof of demonstrating that the variance is justified and will pose no greater risk to public health and the environment than would a system meeting the Regulations. 5. The Division has the ability to impose requirements and conditions on any variance granted. C. Variances for Repair of Failing Systems. 1. When a proposed variance for a system repair or upgrade would result in encroachment on minimum distances to physical features on neighboring properties required by the Division, the hearing procedures in Section 30-4-130.B. above, Requirements for Variance Consideration must be followed. 2. For the repair of or upgrade to an existing system where the existing system does not meet the required separation distances and where the conditions other than lot size precludes adherence to the required distances, a variance to the separation distances may be requested. The repairs or upgrade must be no closer to features requiring setbacks than the existing facilities. Variances requesting setbacks no closer than 'existing setbacks do not have to provide technical justification from a professional engineer or professional geologist. D. Prohibitions on the Granting of Variance Requests. 1. No variance will be issued to mitigate an error in construction involving any element of property improvements. 2. No variance will be issued where the property can accommodate a conforming OWTS. 3. No variance will be issued which will result in setbacks to an offsite physical feature which do not conform to the minimum setbacks defined in Table 30-7-1 without the board of health considering any concerns of the owner of property containing said feature. Property lines are considered offsite features. The property owner containing said feature must be notified of the time and date of the hearing. 4. No variance will be issued which reduces the separation to ground water or bedrock based on the level of treatment in Item 4, Table 30-7-2. 5. No variance from the horizontal setback from a well shall be given which does not also meet the variance requirements of the Board of Examiners of Water Well Construction and Pump Installation Contractors. 6. No variance will be allowed solely for economic gain. 7. No variance shall be issued for the installation of a higher level treatment system based on sizing or separation reductions. E. Outcome of the Variance Proceeding. The applicant shall be notified, in writing, of the decision regarding the request for a variance. The notice of a denial of a variance shall include those reasons which form the basis for the denial. The notice of an approval of a variance shall include any conditions of the approval. The variance, and any conditions thereof shall be recorded on the deed to the property, and any expenses associated with that recording shall be the responsibility of the party obtaining the variance. F. Right to Appeal. Should the Board of Public Health deny a variance under this Section, the applicant shall have the right to appeal such decision to the Weld County Board of County Commissioners pursuant to Section 3-8(4)(n) of the Weld County Home Rule Charter and the procedures promulgated thereunder. Sec. 30-4-140. General Prohibitions. A. No city, county, or city and county shall issue to any person: 1. A permit to construct or remodel a building or structure that is not serviced by a sewage treatment works until the Division has issued a permit for an OWTS. 2. An occupancy permit for the use of a building that is not serviced by a sewage treatment works until the Division makes a final inspection of the OWTS, provided for in Section 25-10-106 (1) (h), C.R.S., and the Division approves the installation. B. Use, construction or existence of cesspools, pit privies, slit trenches, and seepage pits, is prohibited. C. A person must not connect more than one dwelling, commercial, business, institutional or industrial unit to the same OWTS unless such multiple connection was specified in the application submitted and in the permit issued for the system. D. No person shall construct or maintain any dwelling or other occupied structure which is not equipped with adequate facilities for the sanitary disposal of sewage. E. All persons shall dispose of septage removed from systems in the process of maintenance or cleaning at an approved site and in an approved manner. Sec. 30-4-150. Prohibition of On -Site Wastewater Treatment Systems in Unsuitable Areas. A. The Board of County Commissioners may conduct a public hearing, after written notice to all affected property owners as shown in the records of the County Assessor and publication of notice in a newspaper of general circulation at least ten days prior to the hearing, to consider the prohibition of permits for On -site Wastewater Treatment Systems in defined areas. The Board of County Commissioners may order such prohibition upon a finding that the construction and use of additional On -site Wastewater Treatment Systems in the defined area will constitute a hazard to the public health or the environment. In such a hearing, the Board of County Commissioners may request affected property owners to submit engineering and geological reports concerning the defined area and provide a study of the economic feasibility of constructing a sewage treatment works. Section 25-10-111, C.R.S. Sec. 30-4-160. Enforcement. A. Notice of Violations. 1. Whenever the Division Representative determines that there has been a violation of any provision of these Regulations, he/she shall give notice of such violation to the responsible person(s). Such notice shall be in writing, shall specify the violation(s), provide a reasonable time for correction, and shall be addressed to the owner of the property. Service of such notice shall be as provided by the Colorado Rules of Civil Procedure or by certified mail, return receipt requested, deliverable to addressee only. Service by certified mail shall be completed upon receipt by the Division of the return receipt, or upon refusal to accept delivery by the addressee. If the property owner cannot be found or served after a reasonable effort to do so by the Division, service may be made by posting a notice in a conspicuous place on or about the property affected by the notice. A statement by the Division Representative as to why the posting was necessary shall be included in the record. B. Cease and Desist Orders. 1. The Health Officer or his/her designee may issue an order to cease and desist from the use of any OWTS or sewage treatment works which is found by the Health Officer not to be functioning in compliance with these Regulations, the OWTS Act, or with applicable regulations or is found to constitute a hazard to public health, or has not otherwise received timely repairs under the provisions of Section 25-10-106 (1) (j), C.R.S. Such an order may be issued only after a hearing which shall be conducted by the Health Officer not less than 48 hours after written notice thereof is given to the owner or occupant of the property on which the system is located. The order shall require that the owner or occupant bring the system into compliance or eliminate the health hazard within thirty (30) days, or thereafter cease and desist from the use of the system. A cease and desist order issued by the Health Officer shall be reviewable in the district court for Weld County wherein the system is located and upon a petition filed not later than ten days after the order is issued. Sec. 30-4-170. Penalties. A. Any person who commits any of the following acts or violates any of the provisions of this Section commits a Class 1 petty offense as defined in Section 18-1.3-503, C.R.S.: 1. Constructs, alters, installs, or permits the use of any OWTS without first having applied for and received a permit as provided for in these Regulations and the OWTS Act and any other applicable rules and regulations adopted thereunder; 2. Constructs, alters, or installs an OWTS in a manner which involves a knowing and material variation from the terms or specifications contained in the application, permit or variance; 3. Violates the terms of a cease and desist order that has become final under the terms of Section 25-10-106 (1) (k), C.R.S.; 4. Conducts a business as a systems contractor without having obtained the license provided for in these Regulations and the OWTS Act and any other applicable rules and regulations adopted thereunder; 5. Conducts a business as a systems cleaner without having obtained the license provided for in these Regulations and the OWTS Act and any other applicable rules and regulations adopted thereunder; 6. Falsifies or maintains improper records concerning system cleaning activities not performed or performed improperly; or 7. Willfully fails to submit proof of proper maintenance and cleaning of a system as required by these Regulations and the OWTS Act and any other applicable rules and regulations adopted thereunder. B. In addition to the penalty that may be imposed pursuant to Subsection A. above, the Board of County Commissioners, sitting as the Board of Public Health, may assess a monetary penalty pursuant to Section 25-10-113, C.R.S. C. Upon a finding by the local board of health that a person is in violation of this regulation, the local board of health may assess a penalty of up to fifty dollars for each day of violation. In determining the amount of the penalty to be assessed, the local board of health shall consider the seriousness of the danger to the health of the public caused by the violation, the duration of the violation, and whether the person has previously been determined to have committed a similar violation. D. A person subject to a penalty assessed pursuant to section 30-4-170 B. may appeal the penalty to the local board of health by requesting a hearing before the appropriate body. The request must be filed within thirty days after the penalty assessment is issued. The local board of health shall conduct a hearing upon the request in accordance with section 24-4-105, C.R.S. ARTICLE V SITE AND SOIL EVALUATION 4 Sec. 30-5-10. Site an Soil Evaluation eneral equirements. A. A site and soil evaluation must be conducted for each property on which an OWTS is proposed, to determine the suitability of a location to support an oWTS, and to provide the designer a sound basis to select the most appropriate OVVTS design for the location and application. Each site evaluation must c.nsist of: 1. Preliminary investigation; 2. Reconnaissance; 3. Detailed soil investigation; and 4. Report and site plan. Sec. 30-5-20. reliminary Investigation. A. Preliminary investigation: Research of information relative to the site and anticipated conditions must be conducted. Information gathered as part of the preliminary investigation must include, but is not limited to: 1. Property Information: a. Address; b. Legal description; c. Existing structures; and d. Location of existing or proposed wells on the property. 2. Existing Division OWTS records. 3. Published site information: a. Topography; and b. Soil data. 4. Location of physical features, on and off the property that will require setbacks as identified in Table 30-7-1. 5. Preliminary soil treatment area size estimate based on information on existing or planned facility and local regulations. 6. Other information required by the Division. 7. Additional information that may be useful to the specific evaluation as available: a. Survey; b. Easements; c. Floodplain maps; d. Geology and basin maps and descriptions; e. Aerial photographs; f. Climate information; and g. Delineated wetlands maps. Sec. 30-5-30. Reconnaissance. A. Reconnaissance: A visit to the property to evaluate the topography and other surface conditions that will impact the location and design of the OWTS must be conducted. Information gathered as part of the site reconnaissance may include, but is not limited to: 1. Landscape position; 2. Topography; 3. Vegetation; 4. Natural and cultural features; and 5. Current and historic land use. Sec. 30-5-40. Detailed Soil Investigation. A. Soil investigations to determine the long-term acceptance rate of a soil treatment area must be conducted per the following criteria: 1 Visual and tactile evaluation of two or more soil profile test pit excavations must be conducted to determine soil type as well as to determine whether a limiting layer is encountered. 2. In addition to the two soil profile test pit excavations, percolation testing may be conducted to obtain additional information regarding the long-term acceptance rate of the soil. 3. If the site evaluation includes both a visual tactile evaluation of soil profile test pit excavations and percolation tests, and the results from these two evaluations do not coincide with the same LTAR as noted in Table 30-10-1, the designer must use the more restrictive LTAR in determining the size of the soil treatment area. B. Procedure for performing visual and tactile evaluations of soil in order to determine a long- term acceptance rate: 1. The soils evaluation shall be performed by or under the supervision of a professional engineer, professional geologist, competent technician, or other similarly qualified professional as approved by the Division. 2. Evaluation of two or more soil profile test pit excavations must be performed to determine soil types, limiting layers, and best depth for the infiltrative surface. The total number of soil profile test pit excavations beyond the required two shall be based on the judgment of the competent technician. 3. At least one of the soil profile test pit excavations must be performed in the portion of the soil treatment area anticipated to have the most limiting conditions. 4. The minimum depth of the soil profile test pit excavation must be to any limiting layer, or four feet below the infiltrative surface of the in -situ soil, whichever is encountered first. 5. Layers and interfaces that interfere with the treatment and dispersal of effluent must be noted. Thus, any limiting soil characteristic such as consistence also needs to be evaluated. The evaluation of consistence may also include an evaluation of excavation difficulty, rupture resistance, and/or penetration resistance. 6. The soil observations must be conducted at or immediately adjacent to the location of the proposed soil treatment area, but if possible, not under the final location of a trench or bed. 7. Each soil profile test pit excavation observed at the proposed soil treatment area must be evaluated under adequate light conditions with the soil in an unfrozen state. 8. The soil observation method must allow observation of the different soil horizons that constitute the soil profile. 9. Soil profile test pit observations must be conducted prior to percolation tests to determine whether the soils are suitable to warrant percolation tests and, if suitable, at what depth percolation tests must be conducted. 10. The soil type at the proposed infiltrative surface of the soil treatment area or a more restrictive soil type within the treatment depth must be used to determine the long- term acceptance rate from Table 30-10-1 or Table 30-10-1A. The treatment depth is two to four feet depending on the required thickness for the treatment level below the infiltrative surface from Item 4, Table 30-7-2. 11. Soils data, previously collected by others at the site can be used for the purposes of an OWTS design at the discretion of the local public health agency. It is recommended that the data be verified, at a minimum, by performing an evaluation of a soil profile test pit excavation. C. Soil descriptions for determination of a limiting layer must include: 1. The depth of each soil horizon measured from the ground surface and a description of the soil texture, and structure of each soil horizon; 2. Depth to the bedrock; 3. Depth to the periodically saturated soil as determined by: a. Redoximorphic features and other indicators of water levels, or b. Depth of standing water in the soil observation excavation, measured from the ground surface, if observed, unless redoximorphic features indicate a higher level. D. Procedure for performing percolation tests: 1. The percolation testing shall be performed by or under the supervision of a professional engineer, professional geologist, competent technician or other similarly qualified professional as approved by the Division. 2. Number of test holes; Location. a. Soil percolation tests shall be performed in at least three test holes in the area in which the soil treatment area is to be located, spaced evenly over the proposed area. b. If the likely depth of a proposed infiltrative surface is uncertain, percolation tests must be performed at more than one depth to determine the depth of the infiltrative surface. 3. Dimensions. a. The percolation test hole must have a diameter of eight to 12 inches and be terminated a minimum of six inches and a maximum of 18 inches below the proposed infiltrative surface. 4. Change in Soil. a. If a change of soil type, color or structure is present within those soils comprising the depth of soil below the infiltrative surface as required in Table 30-7-2 for vertical separation, a minimum of two soil percolation holes must be terminated in the changed soil, and percolation tests must be conducted in both holes. 5. Percolation Tests. a. The percolation tests must be conducted using the hole preparation, soil saturation and rate measurement procedures described below. b. Preparation of Percolation Test Holes 1) Excavate the hole to the depth and diameter required. 2) Carefully scrape the bottom and sides of the hole with a knife blade or sharp instrument to remove any smeared soil surfaces and provide a natural soil interface into which water may percolate. 3) Remove all loose soil from the hole. 4) Add two inches of very coarse sand or fine gravel to protect the bottom of the hole from scouring and sediment. c. Presoak. 1) The hole must be presoaked adequately to accomplish both saturation, which is filling the void spaces between the soil particles, and swelling, which is the intrusion of water into the individual soil particles. 2) To presoak the hole, carefully fill the hole with clean water to a minimum depth of 12 inches over the gravel placed in the bottom of the hole. In most soils, it is necessary to refill the hole by supplying a surplus reservoir of clean water, possibly by means of an automatic siphon, to maintain water in the hole for at least four hours and preferably over night. Determine the percolation rate 24 hours after water is first added to the hole. This procedure is to ensure that the soil is given ample time to swell and to approach the condition it will be in during the wettest season of the year. In sandy soils containing five percent or less particles passing the #200 sieve, by weight, the swelling procedure is not essential and the test may be conducted after the water from one filling of the hole has completely seeped out of the hole. d. Percolation Rate Measurement. 1) With the exception of sandy soils containing five percent or less particles passing the #200 sieve, by weight, percolation rate measurements must be made on the day following the presoak procedure. 2) If water remains in the percolation test hole after the swelling period, adjust the depth to approximately six inches above the gravel in the bottom of the hole. From a fixed reference point, measure the drop in water level over a 30 minute interval. The drops are used to calculate the percolation rate. 3) If no water remains in the hole after the swelling period, carefully add clean water to bring the depth of water in the hole to approximately six inches above the top of the gravel in the bottom of the hole. From a fixed reference point, measure the drop in water level at 30 minute intervals for four hours, refilling to six inches over the top of the gravel as necessary. The drop in water level that occurs during the final 30 -minute period is used to calculate the percolation rate. If the water level drops during prior periods provide sufficient information, the procedure may be modified to suit local circumstances. The requirement to conduct a four hour test under this Section is waived if three successive water - level drops do not vary by more than 1/16 inch; however, in no case shall a test under this Section be less than two hours in duration. e. Sandy Soils. 1) In sandy soils or other soils in which the first six inches of water seeps out of the hole in less than 30 minutes, after the 24 hour swelling period, the time interval between measurements must be ten minutes and the test conducted for one hour. The drop that occurs during the final ten minutes must be used to calculate the percolation rate. 2) If the soil is so sandy or coarse -textured that it will not retain any water, then the infiltration rate must be recorded as less than one minute per inch. f. Percolation Rate Determination and Reporting. 1) The field percolation rate will be the average rate of the percolation rates determined for all percolation test holes observed in the proposed soil treatment area in minutes per inch. The average percolation rate determined by the tests must be used in determining the long-term acceptance rate for the proposed system from Table 30-10-1. 2) The technician performing the percolation tests shall furnish an accurate scale drawing, showing the location of the soil profile test pit excavations and/or percolation holes tied to lot corners or other permanent objects. The drawing must meet the criteria in Section 30-5-60.A.7. All holes must be clearly labeled to relate to the information provided for the profile test pits and percolation tests. g. Alternate Percolation Testing. 1) Alternate percolation test procedures may be approved, provided the test results of alternate procedures are substantially equivalent to those determined using the test procedures described in this Section. 2) Prior approval from the Division of alternate percolation test procedures is required. Sec. 30-5-50. Marking of Soil Profile Test Pit Excavations or Percolation Holes. The soil profile test pit excavations or percolation holes, must be flagged or otherwise marked to allow easy location by others. Percolation holes must remain open until after evaluation by the Division. The soil profile test pit excavations may be backfilled after evaluation by the third party professional {professional engineer, geologist, competent technician, or other similar professional}. If the profile test pit excavation is backfilled prior to inspection by the Division, a monitoring port shall be installed prior to backfilling for evaluation by the Division. Soil test pit excavations that are left open must be suitably barricaded to prevent unauthorized access and to address safety concerns. Sec. 30-5-60. Report and Site Plan. A. A written report must describe the results of the preliminary investigation, reconnaissance, and detailed evaluations. The report may be in text and/or tabular form and must include a drawing locating features relative to the proposed OWTS location and test locations. The report may be included as part of the OWTS design document. The report must include, but is not limited to: 1. Company name, address, telephone number, e-mail address, and name of individual, credentials and qualifications of the individual conducting the site evaluation; 2. Preliminary and detailed evaluations, providing information from the surface site characteristics assessment and soils investigation; 3. Dates of preliminary and detailed evaluations; 4. A graphic soil log, to scale, indicating depth of the soil test pit excavation, soil description and classification, depth to any limiting layer encountered, type of equipment used to excavate the soil profile test pit, and date of soils investigation. 5. Setback distances to features listed in Table 30-7-1; 6. Setback distances to features listed in Table 30-7-2, existing on the site or within applicable setback limits, whichever is greater; 7. A drawing created to a scale that provides the complete property boundary lines. The minimum drawing size is 8.5 -inches by 11 -inches. If the property is too large to adequately indicate and label the profile test pits and percolation test holes, a detail of the portion of the site containing the soil profile test pits and percolation test holes must be submitted. If the property is too large to adequately show site evaluation information, a detail drawing that includes the information required from the site and soil evaluation that will impact the location of the OWTS must be submitted. Drawings must indicate dimensions, have a north arrow and graphic scale and include: a. Fixed, non -degradable temporary or permanent benchmark, horizontal and vertical reference points of the proposed soil treatment area; soil observations; percolation testing results and pertinent distances from the proposed OWTS to all required setbacks, lot improvements, easements; ordinary high water mark of a pond, creek, stream, lake, wetland or other surface waters, and detention or retention ponds; and property lines; b. Contours or slope direction and percent slope; c. The location of any visible or known unsuitable, disturbed or compacted soils; d. The estimated depth of periodically saturated soils and bedrock, or flood elevation, if applicable; and e. The proposed elevation of the infiltrative surface of the soil treatment area, from an established datum (either ground surface or a benchmark). 8. Anticipated construction -related issues, if applicable; 9. An assessment of how known or reasonably foreseeable land use changes are expected to affect the system performance, including, but not limited to, changes in drainage patterns, increased impervious surfaces and proximity of new water supply wells, if applicable; and 10. A narrative explaining difficulties encountered during the site evaluation, including but not limited to identifying and interpreting soil and landform features and how the difficulties were resolved, if applicable. Sec. 30-5-70. Design Document. A. The report and site plan may be attached to the design document or the report and site plan may be combined with the design information as a single document. B. The design document must include a brief description of the facility and its proposed use, basis and calculations of design flow, and influent strength. C. The design document must contain all plan detail necessary for permitting, installation and maintenance, including: 1. Assumptions and calculations for each component, including total dynamic head (TDH) and gallons per minute (GPM) for all dosing systems; 2. A fixed, non -degradable temporary or permanent benchmark, (North America Vertical Datum or assumed elevation is acceptable); 3. A scale drawing showing location of each OWTS component and distances to water supplies, surface water, physical and health impact features on both the subject and adjacent properties requiring setbacks; 4. Layout of soil treatment area, dimensions of trenches or beds, distribution method and equipment, distribution boxes, drop boxes, valves, or other components used; 5. Elevation or depth of infiltrative surface of the soil treatment area, the septic tank invert, and all other components of the OWTS; 6. Special structural design considerations, as applicable to ensure the long-term integrity of each component; 7. References to design manuals or other technical materials used; 8. Installation procedures, as applicable; 9. Operation and maintenance manuals or instructions; and 10. Other information that may be useful such as photos and cross-section drawings. Sec. 30-5=8 Sit Protection. Prior to and during construction, the proposed soil treatment area and replacement area, if any, must be protected from disturbance, compaction, or other damage by means of staking, fencing, posting, or other effective methods. Sec. 30-5-90. Qualifications fr a Compet A. Percolation Tests. 1. Competencies needed: a. Set up equipment; t Tech n ciano b. Perform and run percolation tests according to the procedure in this Regulation; and c. Record results and calculate percolation rates. 2. The Division may approve training for percolation testing. B. Visual and Tactile Evaluation of Soil. 1. Competencies needed: a. Identify soil types by hand texturing and observation; b. Identify presence or absence of soil structure; c. Identify type and grade of soil structure; d. Recognize evidence of highest seasonal water surface; e. Identify layers and interfaces that will interfere with effluent movement; f. Determine the most promising depth for infiltrative surface of OWTS and for percolation tests, if used; and g. Understand basic principles of OWTS siting and design. 2. Possible demonstrations of competence in visual and tactile evaluation of soil: a. Degree in soil science, agronomy, geology, other majors if a course(s) in soil morphology was included; or b. Attendance at training or workshop for soil evaluation for OVVTS including both class and field work. (1) If the training or workshop includes an exam to verify acceptable completion of the course, a passing grade on the exam must be attained. 3. The Water Quality Control Division must approve training for visual and tactile evaluation of soil. ARTICLE VI WASTEWATER FLOW AND STRENGTH Sec. 30-6-10. Wastewater Flows. A. The Division may require the installation of a meter to measure flow into the facility or the OWTS. B. Single -Family Residential Homes. 1. Design flow per person must be 75 gallons per day (gpd). 2. The minimum design flow for a new home must be for a two -bedroom house, unless otherwise noted in this regulation. The minimum design flow for the repair or replacement of an OWTS of an existing one -bedroom home must be for one -bedroom unless bedrooms are added. 3. For homes up to and including three bedrooms, the assumed number of persons per bedroom is two for design purposes. 4. For homes with more than three bedrooms, the assumed number of persons is six persons (first three bedrooms x two persons per bedroom) plus one additional person for each bedroom more than three bedrooms. 5. Table 30-6-1 summarizes the design flows for single-family residential homes up to six bedrooms. Table 30-6-1 Single -Family Residential Design Flows # Bedrooms Occupancy (# of Persons) Wastewater Flow Per Person (gallons/day) Design Flow (gallons/day) 2 4 75 300 3 6 75 450 4 7 75 525 5 8 75 600 6 9 75 675 C. Auxiliary Buildings 1. If a single-family home has an auxiliary building, such as a non-commercial shop with plumbing fixtures, the flow may be conveyed to the OWTS of the home, or to a separate OWTS constructed to handle the flow from the auxiliary facility. 2. If the flow from the auxiliary building is only generated by residents of the home, it will be assumed that the OWTS for the home will be adequately sized to include the auxiliary building if the flows are combined. 3. If the auxiliary building will have users in addition to residents and the flow from the auxiliary building will flow to the OWTS of the home, the design flow of the home must include the increased use. 4. If the auxiliary building has a separate OWTS, the facility must be sized on the basis of Table 30-6-2 and a septic tank detention time of 48 hours. D. Multi -Family and Commercial On -site Wastewater Treatment Systems. 1. Design flow values and strengths for multi -family and commercial systems must be determined from: a. Table 30-6-2; or b. An analysis of flows and strengths from at least three comparable facilities or from the facility, if it is an existing facility, must be submitted to the Division for approval. The analysis must include: 1) Metered water flows for inside use only for at least a year, or if use is seasonal, for a full season. If metered flows are less than full capacity, they must be paired with actual use in units of persons present or meals served or other units as appropriate so that an actual daily rate per unit can be determined. The daily rate per unit times the number of units at full occupancy will be the design flow. 2) Total Suspended Solids and BOD5 or CBOD5 tests at times of full use. At least three samples taken at least one week apart are required. Sampling that provides equivalent and representative data through "composite sampling" may be allowed. 3) Explanation and justification for the comparability of the tested facilities with the proposed facility. E. Flow Equalization. 1. Flow equalization may be used if a facility has flows that vary from day to day by more than four times the average flow. 2. The highest peak assumed must be at least equal to the full capacity of the facility. 3. The stored flow must be distributed to the soil treatment area before the next greater - than -average peak. 4. Flow equalization may be used only if: a. The facility is non-residential; b. The facility is only used for one purpose; c. Flows will follow a predictable pattern; and d. There is a long-term expectation that size and pattern of the flows will remain the same. 5. Timed dosed pressure distribution or timed dosed NDDS must be used. The soil treatment area reduction for pressure distribution must not be used in addition to the flow equalization reduction. 6. Contingency plans must be made for expanding the capacity of the OWTS in the event of changed use at the facility. TABLE 30-6-2 Estimate of Average Daily Wastewater Flow and BOD5 Load Per Person Unless Otherwise Noted RESIDENTIAL WASTEWATER GPD BOD5 IN POUNDS PER DAY, Single-family dwellings 75 .20 Auxiliary buildings by fixture type Bath/Shower 14.7 .014 Dishwasher 1.8 .002 Kitchen sink with garbage grinder 5.8 .052 Laundry washer 19.5 .037 Lavatory 8.4 .021 Water closet (toilet) 24.8 .029 Hotels and motels per room 75 .15 Multiple -family dwellings or apartments 75 .20 Boarding and rooming houses (users absent during working hours) 50 .15 Tiny Homes***, per unit 150 .40 Mobile home 75 .20 Mobile home park per space 300 .80 COMMERCIAL WASTEWATER GPD BOD5 POUNDS DAY IN PER Facilities with theaters Airports per short-term person or or auditoriums bus attending; or transient stations ball per per visitors parks, seat passenger; race tracks, .02 Examples: fairgrounds stadiums, Airport per employee 10 .06 Barber and beauty shops per chair 100 .70* Bowling alleys per lane - toilet wastes only 5 .03* Country club per member 30 .02 County club per employee 20 .06 Dentist offices per non -wet chair 50 .14* Doctor offices per doctor 250 .80* Factories employee and per plants eight g -hour exclusive shift — of no industrial showers wastewater per 20 .05 Factories employee and per plants ei g exclusive ht -hour shift of - showers industrial provided wastewater per 35 .08 Kennels per dog 30 .20 Laundries, self-service per commercial washer 400 .75 Office buildings per employee per eight -hour shift 15 .06 Service stations per toilet fixture 250 .50* Stores and shopping centers per square foot of retail space .1 .01* Work toilets or construction camps semi -permanent with flush 50 .17 Work toilets or construction camps semi -permanent without flush 35 .02 FOOD SERVICE ESTABLISHMENT GPD BOD5 POUNDS DAY IN PER Restaurant open 1 or 2 meals per seat 50 .06/meal 24 -hour restaurant per seat 75 .07/meal served Restaurant with paper service only per seat 25 .01 /meal served Additional for bars and cocktail lounges per seat 30 .02 Drive-in restaurant per car space 50 .02 INSTITUTIONAL WASTEWATER WITHOUT KITCHENS UNLESS OTHERWISE NOTED GPD BODs IN POUNDS PER DAY Churches per seat; without any food service, or other uses 3.5 .01 Churches, per seat; warming kitchen only, no major food service 5 .01 Churches, per seat; with food service, per meal served**** 4 .02 Hospitals per bed space 250 .20 Nursing homes; Group homes for developmentally disabled, per bed space 125 .20 Schools, Boarding per person 100 .17 Schools, Day without cafeteria, gym or showers 15 .04 Schools, Day with cafeterias, no gym or showers 20 .08 Schools, Day with cafeterias, gym and showers 25 .10 Schools, Day additional for school workers 15 .06 RECREATIONAL AND SEASONAL WASTEWATER USE GPD BOD5 IN POUNDS PER DAY Camps, day, no meals served 15 .12 Luxury resort 125 .17 Resort night and day 50 .12 Campground per campsite** 50 .12 Public park flush toilet per fixture per hour when park is open 36 .04 lbs./ fixture Public park urinal per fixture per hour when park is open 10 .01 lbs./fixture Public park shower per fixture per hour when park is open 100 .10 lbs./ fixture Public park faucet per fixture per hour when park is open 15 .04 lbs./ fixture Swimming pools and bathhouses 10 .06 Travel trailer parks with individual water and sewage hookup per unit ** 100 .24 Travel trailer park without individual water and sewage hookup per unit ** 50 .12 *BOD levels need further verification depending on the specific use of the facility. **Laundry facilities are to be calculated on a per commercial washer basis in accordance with other elements of this table ***For the purpose of this Table, a "Tiny home" is a structure that has only one bedroom and has <400 sq. ft. of livable space, including lofts. In this instance, the OWTS may be sized for only one bedroom. ****For churches with food service, the 4 gal/meal must be added to the 3.5 gal/seat to determine projected design flows. Sec. 30-6-20. Wastewater Strength. A. Table 30-6-3 includes levels of treatment that can be achieved by various OWTS components, excluding the soil treatment area. Systems qualifying for these treatment levels except TL1 produced by a septic tank alone must be approved by the Water Quality Control Division under Section 43.13. of OWTS Regulation #43. B. High strength waste must be reduced to at least Treatment Level TL1 quality or lower before applying to a soil treatment area. Waste strength levels defined in Tables 30-6-3 and 30-6-4 must be used to determine compliance. Tabb 30-6-3 'it/ Treatment Levels C } , -:D5 (rnsi'JL) TSS (mg/L) Total (mg/L) Nitrogen Treatment Level B. D5 (mg/L) TL 12 180 - 80 60-80 L 2 EI6 M Y a y ' 2 '3, ��a � rr2'a N ky 30 � ,�tey(s,r. - A3 IL 2N yx�M $ 26 30 >50% reduction4 �k fG�•-' s?g / z t �� E �� 37/ y�s�.� 'en 2c�" i ya' � a'.- 3 � vC n 7, ,.�:. 1 N/A3 (Shading indicates higher treatment levels) 1 Requirements for CBOD5 are only related to effluent samples from a higher level treatment system. 2 Domestic septic tank effluent prior to soil treatment or higher level treatment has a wide range of concentrations. These values are typical, but values used for design must account for site -specific information. 3 Total Nitrogen does not apply to Treatment Levels TL2 and TL3. Processes intended to reduce total nitrogen are addressed in Treatment Levels TL2N and TL3N. Any total nitrogen reductions that may be observed for TL2 and TL3 are as a result of the treatment process for BOD5 and TSS reductions. 4 NSF/ANSI Standard 245 — Wastewater Treatment Systems — Nitrogen Reduction requires reduction of 50 percent rather than an absolute value. Table 30-6-4 High Strenth Wastewaters Septic Tank Influent BODs (rrig/L) >300 TSS (mg/L) >200 Fats, Oils, Grease (FOG) (mg/L) >50 Septic Tank Effluent >180 >80 >25 *High strength effluent prior to a septic tank has a wide range of concentrations. The values are typical, but values used for design purposes must account for site -specific information. ARTICLE VII MINIMUM DISTANCES BETWEEN COMPONENTS OF AN ON -SITE WASTER TREATMENT SYSTEM AND PHYSICAL FEATURES Sec. 30-7-10. Minimum Horizontal Distances. A. Horizontal distances from the various components of an OWTS to pertinent terrain features, including streams, lakes, water courses, springs, wetlands, wells, subsurface drains, cisterns, water lines, suction lines, dry gulches, cut banks, dwellings, other occupied buildings and property lines, must be in accordance with Table 30-7-1. The setback requirements are applicable for minimum system performance and treatment as provided in Table 30-7-2. All distance setback modifications must be analyzed and approved by the Board of Public Health and be in complete compliance with the variance procedures of this Regulation. Acceptable methods of analyzing horizontal separation distances with higher treatment levels include but are not limited to: 1. Analyzing the intended uses of impacted surface and/or ground waters; 2. Contacting adjacent property owners for potential conflicts with property line encroachments; and 3. Analyzing potential impacts that system locations may have on building foundations and other potentially affected features. Sec. 30-7-20. Dry Gulches, Cut Banks and Fill Areas. A. Separation distances to dry gulches, cut banks and fill areas in Table 30-7-1 must apply unless the designer or design engineer determines by observation of the exposed slope of the dry gulch or cut bank or by soil profile test pit excavations that a limiting layer is present that will direct or allow the effluent from the soil treatment area to move laterally and surface. In this instance, a greater distance may be required. B. A lesser distance may be used if it can be demonstrated by a professional engineer or professional geologist that the use of a barrier, such as a minimum 30 mil PVC liner placed between the soil treatment area and the slope of the dry gulch, cut bank or fill area will prevent effluent surfacing laterally. C. The separation distance between a component and the crest of a dry gulch or cut bank will be evaluated for potential erosion or slope instability if the component and the slope are too close together. If there is potential for erosion or instability, the separation distance must be increased until the risk is minimized. Sec. 30-7-30. On -site Wastewater Treatment System Design Consideration and Treatment Requirements — Separation Distances from Soil Treatment Area. A. Table 30-7-2 provides the required site evaluation, design, and treatment level considerations necessary to evaluate the site and to design and locate the soil treatment area component of an OWTS. B. Items 1, 2 and 3 in Table 30-7-2 address the allowable horizontal setback distance between the soil treatment area and the following physical features: 1. Setback distance from soil treatment area to on -site well; 2. Setback distance from soil treatment area to water features; and 3. Setback distance from soil treatment area to a dry gulch or cut bank. C. Item 4 in Table 30-7-2 addresses the required vertical separation distance between the infiltrative surface of the soil treatment area and the limiting layer or the required depth of soil comprising the soil treatment area. Table 30-7-1 Minimum Horizontal Distances in Feet Between Components of an On -Site Wastewater Treatment System Installed After November 15, 1973 and Water, Physical and Health Impact Features Spring, Well, Suction Line Water Supply Cistern4 Potable Water Line2 Structure w/basement crawlspace or footing drains without basement Potable Supply crawlspace Lateral, or footing drains Property Lines, Structure Drain, Piped or Lined Irrigation Ditch upslope curtain drain Subsurface Intermittent Irrig Irrigation Drywell, Stormwater Structure Lake, Water Course, Ditch, Stream, Wetland Dry Gulch, Cut Bank, Fill Area (from Crest) Septic Tank Higher level unit Dosing Tank Vault or Privy Septic Tank, Higher Level Treatment Unit, Dosing Tank, Vault or Vault Privy 502 102 5 5 10 10 50 10 -- Building Sewer or Effluent Lines 502 56 0 0 102 102 502 102 -- STA Trench, STA Bed, Unlined Sand Filter, Sub -surface Dispersal System 1003 252 20 10 10 25 503 25 5 Lined Sand Filter 60 102 15 10 10 10 25 10 5 Lined Evapotranspiration Field or Outside of Berm of Lined Wastewater Pond 60 102 15 15 10 10 25 10 5 Unlined Sand Filter in Soil With a Percolation Rate Slower than 60 Minutes per Inch, Unlined or Partially Lined Evapotranspiration System, Outside of Berm of Unlined Wastewater Pond, or System Not Relying on STA for Treatment Other than Aerosol 100 252 15 15 10 25 25 15 10 System Not Relying on STA for Dispersal 1003 102 125 125 10 0 253 10 10 NOTE: The minimum distances shown above must be maintained between the OWTS components and the features described. Where soil, geological or other conditions warrant, greater distances may be required by the Board of Public Health or by the Water Quality Control Commission pursuant to Section 25-8-206, C.R.S. and applicable regulations. For repair or upgrading of existing OWTS where the size of lot precludes adherence to these distances, a repaired OWTS shall not be closer to setback features than the existing OWTS, as reviewed and approved by the Water Quality Control Division. Components that are not watertight should not extend into areas of the root system of nearby trees. 1 Includes potable wells, irrigation wells and monitoring wells set within a potable aquifer and infiltration galleries permitted as wells by the Division of Water Resources. 2 Crossings or encroachments may be permitted at the points as noted above provided that the water or wastewater conveyance pipe is encased for the minimum setback distance on each side of the crossing. A length of pipe with a minimum Schedule 40 rating of sufficient diameter to easily slide over and completely encase the conveyance must be used. Rigid end caps of at least Schedule 40 rating must be glued or secured in a watertight fashion to the ends of the encasement pipe. A hole of sufficient size to accommodate the pipe must be drilled in the lowest section of the rigid cap so that the conveyance pipe rests on the bottom of the encasement pipe. The area in which the pipe passes through the end caps must be sealed with an approved underground sealant compatible with the piping used. Other methods of encasement that provide equal protection are allowed. These methods must be designed by a professional engineer and approved by the local public health agency. 3 Add eight feet additional distance for each 100 gallons per day of design flows between 1,000 and 2,000 gallons per day, unless it can be demonstrated by a professional engineer or geologist by a hydrologic analysis or the use of a barrier, consisting of a minimum 30 mil PVC liner or equivalent, that contamination will be minimized. 4 All horizontal setbacks to a potable water supply cistern must be met unless a variance by the Board of Examiners of Water Well Construction and Plumb Installation Contractors is granted per section 11.4 of the Water Well Construction Rules, 2 CCR 402-2. The minimum horizontal setback that may be granted through a variance is to 25 feet. 5 If the structure is not used as a habitable unit, the isolation may be reduced by the local board of health to no less than 50 feet. 6 Building sewer installations shall meet the design requirements of the Colorado Plumbing Code. Table 30-7-2 On -site Wastewater Treatment System Design Consideration and Treatment Requirements — Separation Distances from Soil Treatment Area ITEM OWTS DESIGN CONSIDERATION All Treatment Levels Horizontal Separation Distances 1 Distance from soil treatment area to on -site well Greater than or equal to 100 feet 2 Distance from soil treatment area to pond, creek, lake, or other surface water feature Greater than or equal to 50 feet 3 Distance from soil treatment area to dry gulch or cut bank Greater than or equal to 25 feet Vertical Separation Distances 4 Treatment depth in feet from infiltrative surface to a limiting layer 4 feet (3 feet with pressure dosing) NOTE: Treatment levels are defined in Table 30-6-3. ARTICLE VIII DESIGN CRITERIA - GENERAL Sec. 30-8-10. Performance. A. The OWTS for single-family homes shall be designed to accommodate the proposed flows from the structure as defined in 30-6-10. B. Flow estimates for multi -family or commercial OWTS must comply with 30-6-10.D.1. Expected waste strength as noted in Table 30-6-3 and Table 30-6-4 must also be addressed, where applicable. Installation of low flow fixtures or the separation of toilet waste or other sources of wastewater does not allow for the reduction in the size of an OWTS. B. OWTS shall be designed and constructed to achieve the treatment level specified by the design. Sec. 30-8-20. Reliability. OWTS must be designed and constructed such that each component shall function, when installed and operated, in a manner not adversely affected by normal operating conditions including erosion, corrosion, vibration, shock, climatic conditions, and usual household chemicals. Each component must be free of non-functional protrusions or sharp edges, or other hazards, which could cause injury to persons, animals, or properties. Design must be such as to exclude flies and rodents and other vectors and to prevent the creation of nuisances and public health hazards and must provide for efficient operation and maintenance. Sec. 3 -8-300 Accessibility for Inspection, aintenance, a;_ d Servicing. A. Septic tanks must have watertight risers over each access manhole and all risers must extend to or above final grade. S For new construction, the top of any septic tank, dosing tank or vault must be no deeper than four feet below finished grade. C. Each treatment component of an O\Ts other than the septic tank and soil treatment area shall be equipped with access manholes with risers that extend to or above final grade, located to permit periodic physical inspection, collection and testing of samples and maintenance of all components and compartments. D. Riser Lids 1. Each riser lid must be watertight, brought to or above the surface, and must have a secure closing mechanism, such as a lock, special headed bolts or screws, or sufficient weight (defined as 59 pounds) to prevent unauthorized access. E. Components that require access for maintenance must include but not be limited to submerged bearings, moving parts, pumps, siphons, valves, tubes, intakes, slots, distribution boxes, drop boxes, cleanouts, effluent screens, filters, inlet and outlet baffles, aerators, treatment equipment and other devices. F. Components must be designed andconstructed so that, when installed, they must be easily maintained, sampled, and serviced according to the manufacturer's recommendations. Easy physical access to treatment components by maintenance personnel and equipment must be provided. c. 300 Plumbing Code Plumbing fixtures, building sewers, vents, sewer lines and other appurtenances must be designed, operated and maintained so as to comply with the minimum requirements of the locally enforced plumbing code. In the absence of a local plumbing code, designs must adhere to the Colorado Plumbing Code (3 CCR 720-1). A ,local plumbing permit may be required. auto 30 - Electrical Equipment. A. All electrical work, equipment, and material must comply with the requirements of the locally enforced code. A local electrical permit may be required. E. Electrical components must be protected from moisture and corrosive gases. Seca 30 -6indicators of Failure or Malfunctioning for Systems Utilizing Mechanical �:.p aratuso A signal device must be installed which will provide a recognizable indication or warning to the user that the system or component is not operating as intended. This indication or warning must be a visual signal and an audible signal and must be located in a centralized area within visual and audible range of the system user. A signal or message may also be sent remotely to a maintenance provider. Sec. 30-8-70. Sampling Access. A. If sampling for testing or as a requirement for a permit will be required of effluent from a component other than the soil treatment area, an accessible sampling point must be provided. B. If sampling of the treated wastewater from the soil treatment area will be required for testing or as a requirement for a permit, a monitoring well or wells must be constructed. Monitoring wells must be located down gradient from the soil treatment area, accessible, and provided with a properly securable cover at or above the ground surface. Monitoring wells up gradient of the system may also be required. Lysimeters or other collection devices under the soil treatment area may be used instead of a monitoring well. Sec. 30-8-80. Component Operating Instructions. A. The manufacturer of proprietary treatment units utilizing mechanical components must provide clear, concise written instructions covering the components which, when followed, must assure proper installation and safe and satisfactory operation and maintenance. B. If the OWTS uses public domain technology, the design engineer must provide clear, concise written instructions covering the components which, when followed, must assure proper installation and safe and satisfactory operation and maintenance. Sec. 30-8-90. Surface Activity. Activity or use on the surface of the ground over any part of the OWTS must be restricted. The soil treatment area must not be subject to damage or soil compaction from livestock, vehicular traffic, recreational use, or other site development activity. Construction equipment not necessary to install the OWTS must be kept off of the soil treatment area to prevent undesirable compaction of the soils. If compaction occurs, the disturbed or compacted soil must be re-evaluated and/or new soil evaluations performed. The system must be redesigned if the soil permeability has changed. Sec. 30-8-100. Floodplains. A. A new, expanded or repair/replacement OWTS installed in a 100 -year floodplain must meet or exceed the requirements of the Weld County Flood Plain Management Ordinance contained in Chapter 23 and the Federal Emergency Management Agency. Repairs of an existing system must meet the requirements as feasible. The system as approved by the Division must be designed to minimize or eliminate infiltration of floodwaters into the system and discharge from the system into the floodwaters. The OWTS must be located to avoid impairment to floodwaters or contamination from them during flooding. The Division has available a floodplain guidance document. B. A new or expanded OWTS must not be installed in a floodway designated in a 100 -year floodplain where a conforming OWTS outside the floodway can be installed. For any new OWTS or system repair that may affect the floodway delineation, appropriate procedures must be followed including revision of the floodway designation, if necessary. Sec. 30-8-110. Business Commercial, Industrial, Institutional or Multi -Family Dwelling Wastewater Systems. A. An OWTS that will serve a business, commercial, industrial or institutional property, or a multifamily dwelling must: 1. Be designed by a professional engineer; 2. Receive only such biodegradable wastes for treatment and distribution as are compatible with those biological treatment processes as occur within the septic tank, any additional treatment unit and the soil treatment area; and 3. Receive authorization by rule or a class V underground injection permit from the United States Environmental Protection Agency (EPA) before an application for an OWTS permit is approved if the system may receive non-residential wastewater or is otherwise covered by the EPA underground injection control program. Subsequent to acceptance by the EPA, the Division may choose to also issue a permit for this type of use. ARTICLE IX DESIGN CRITERIA - COMPONENTS Sec. 30-9-10. Tanks and Vaults. A. Watertightness 1. Septic tanks, vaults, dosing tanks, other treatment components, risers and lids must not allow infiltration of ground water or surface water and must not allow the release of wastewater or liquids through other than designed openings. 2. When the final compartment of a tank is being proposed for use as a pump or siphon chamber, the wall between this chamber and the previous chamber must be watertight except for the intended hydraulic opening. 3. Acceptable watertightness testing methods performed at a manufacturer's site or in the field include water filling the tank or vacuum testing. B. Tank Anchoring: In locations where ground water or floodwaters may cause instability problems to the septic tank, vault, or other treatment unit in the OWTS due to flotation, the tank, vault or unit must be anchored in a manner sufficient to provide stability when the tank is empty. Risers must be included in the buoyancy calculations. 1. If a manufacturer provides recommendations for anchoring designs, they may be used if they meet the conditions present at the site. 2. If a manufacturer does not provide recommendations for provisions to compensate for buoyancy, or if the professional engineer chooses to provide his/her own designs, the anchoring system design must be prepared by the professional engineer. C. Identification and Data Marking: All tanks and treatment units must be permanently and legibly marked in a location for the purpose of inspection that is readily visible when inspected before backfilling. The marking inscription must include the following: 1. Name of manufacturer; 2. Model or serial number, if available; 3. Effective volume and unit of measure; 4. Maximum depth of earth cover and external loads the tanks is designed to resist; and 5. Inlet and outlet identifications, if relevant. Sec. 3o -`'r -2f o Septic Tankse A. The manufacturer must provide sufficient information to demonstrate that the tank will meet the design specification. B. Sizing Requirements: 1. Sizing for residential capacity for new installations must be based upon the number of bedrooms according to Table 30-9-1: Table 30-9-1 Minimum Septic Tank Size Based on Number of Bedrooms Number of Bedrooms 2 or 4 Each Additional Tank Capacity (gallons) 1,000 1,250 250 2. For multi -family and non-residential applications, a septic tank must be sized to permit detention of incoming wastewater design flows for a minimum of 48 hours. 3. For systems that remove toilet waste for separate treatment, tank capacity may be less than 1,000 gallons, if it provides a minimum of 48 hours detention time. 4. Minimum tank size for new installations other than for a single-family residence is 400 g allons C. Inspection and Testing of Septic Tank Watertightness. 1. Testing of septic tanks must be performed and evaluated as specified in Section 9 of ATM C1227-13 (Standard Specification for Precast Septic Tanks) for concrete tanks or in Standard IAPMO/ANSI Z1000-2013 (American Standards for Prefabricated Septic Tanks) for other prefabricated septic tanks. 2. Each unit must be inspected in the field for conditions that may compromise its watertightness. 3. The inspection in the field must be conducted by the Division and be performed after the tank installation but before backfilling. 4. If the inspection in the field indicates that the tank may be damaged or is not watertight, the Division Representative may require that the tank be tested for watertightness by the tank manufacturer or the system contractor. D. Septic Tank Design and Dimension Criteria. 1. A septic tank must have two or more compartments or more than one tank may be used in series. The first compartment of a two -compartment tank or the first tank in a series must hold no less than one-half of the required effective volume. 2. Inlet invert must be at least two inches higher than the outlet invert. 3. Inlet tee or baffle must extend above the surface of the liquid at least five inches and must extend a minimum of eight inches below the liquid surface. However the inlet tee or baffle must not extend to a depth of more than 40 percent of the liquid depth measured from the liquid surface. 4. Outlet tee or baffle must extend at least 5 inches above and 14 inches below the outlet invert, however it must not extend to more than 40 percent of the liquid depth measured from the liquid surface. The outlet tee or baffle that accommodates an effluent screen must be located so that the effluent screen has sufficient clearance to be removed through the access opening with a riser in place. 5. The distance from the outlet invert to the underside of the tank top must be at least ten inches. 6. Liquid depth must be a minimum of 30 inches and the maximum depth must not exceed the tank length. 7. The transfer of liquid from the first compartment to the second or successive compartment must be made at a liquid depth of between 35 and 40 percent of the liquid depth measured from the liquid surface. 8. At least one access opening no less than 20 inches across must be provided in each compartment of a septic tank. 9. A septic tank must have a minimum of 25 square feet of liquid surface area and have at least a six-foot separation between inlets and outlets. Septic tanks in series, combined, must have a minimum of 25 square feet of liquid surface area and the sum of the distances between inlets and outlets of all tanks must be at least six feet. The requirements for liquid surface area and separation between inlet and outlet may be waived for tanks with less than 750 gallon effective volume. E. Concrete Septic Tank Structural Design. 1. Concrete septic tanks must comply with the structural design criteria of ASTM C1227- 13 (Standard Specification for Precast Septic Tanks). 2. The design for each tank model and size by each manufacturer must be certified by a professional engineer as complying with these design and structural requirements and the watertightness standard of this Regulation. 3. Certification by a professional engineer must be submitted to the Water Quality Control Division for acceptance. 4. Tank slab lids, mid -seam tanks, and the connections between the tank and risers must be designed to provide for a watertight seal. F. Fiberglass, Fiberglass -Reinforced Polyester, and Plastic Tanks. 1. All fiberglass, fiberglass -reinforced polyester, and plastic tanks must meet the minimum design and structural criteria of IAPMO/ANSI Z1000-2013 (American Standards for Prefabricated Septic Tanks) and be certified by a professional engineer as meeting these standards. The professional engineer certifying the criteria must be registered or licensed in the United States, but need not be registered in Colorado. 2. All tanks must be sold and delivered by the manufacturer or manufacturer's designated representative, preferably completely assembled. On -site tank assembly will be allowed on an as -needed basis. 3. Tanks must be structurally sound and support external forces as specified in the standard referenced above when empty and internal forces when full. Tanks must not deform or creep resulting in deflection of more than five percent in shape as a result of loads imposed. 4. All tanks must be constructed of sound, durable materials and not be subject to excessive corrosion, decay, frost damage, or cracking. 5. All seams or connections including to risers must be sealed to be watertight. G. Metal tanks are prohibited. Sec. 30-9-30. Abandonment of Tank. A. The contents of a tank shall be pumped by a Weld County licensed systems cleaner and properly disposed by methods specified in Section 30-4-120. B. 3. B. A tank may be completely removed and the parts disposed of safely. C. If the tank will remain in place: (see Sec. 30-9-30.A) 1. The bottom of the tank must be broken so the tank neither floats nor fills with water; 2. The top must be collapsed and the sides may be broken into the void; 3. The remaining void must be filled with gravel, sand or compacted soil; and 4. The filled excavation will be graded to surroundings, allowing for settling. D. The Division requires abandonment of a tank that is deemed to be a hazard. Sec. 30-9-40. Pipe Standards and eddi g Re h 4 , Y f rements. A. Pipe Standards 1. All wastewater pipes used in portions of an OVVTS that are pressurized must be constructed of compatible pipe, primer, bonding agent, and fittings. Flexible couplings to connect pipes may only be used in portions of an OWTS that are intended for gravity flow of the wastewater. 2. Where unperforated plastic pipe and fittings are used for gravity flow, the minimum wall thickness of the pipe must conform to ASTM Standard D 3034 or equivalent or greater strength. Schedule 40 pipe is preferred. 3. Perforated distribution pipe surrounded by rock within a soil treatment area must have a minimum wall thickness and perforations conforming to ASTM Standard D 2729 or equivalent or greater strength. Corrugated polyethylene pipe with smooth interior that meets ASTM F405 or AASHTO M252 specifications or equivalent may be used. 4. Schedule 40 or pipe of equivalent or greater strength must be used for the placement of piping under driveways or roadways and in instances where sewer line setback distances are granted a variance for any reason. 5. Tile pipe, open -joint pipe, and cast iron pipe must not be used in an OVVTS. 6. Pressure pipe must be rated for the intended use to accommodate pump discharge pressure. B. Bedding: All system piping, except for distribution laterals within the soil treatment area, must be bedded with select material before final inspection by the Division. Select bedding material must consist of loose, granular material, free from stones, clods, frozen soil, or other deleterious material. Select material may consist of on -site job -excavated or imported material. Bedding material must be mechanically compacted to support piping. C. Pipe identification and data marking must be visible for the purpose of inspection before backfilling. Sec. 30-9-50. Cleanouts. ell/6 61 A. Cleanouts required between the building and the septic tank: 1. Cleanouts must have a secure cap and a riser extending to or easily accessible from grade. The installation of a straight tee or sanitary tee is acceptable. 2. Cleanouts must be provided within five (5) feet of the outside of the building. 3. Where a sewer has a change of horizontal direction greater than 45 degrees, a cleanout must be installed at the change of direction unless a cleanout already exists within 40 feet upstream of this fitting. Where more than one change of direction greater than 45 degrees occurs within 40 feet of a developed length of piping, the cleanout for the first change of direction may serve as the cleanout for all changes within that 40 feet of developed length of pipe. 4. Cleanouts must be provided at intervals within the building sewer from the structure to the tank of not more than 100 feet. The effluent pipe between the septic tank and soil treatment area is exempt from this requirement Sec. 30-9-60. Distribution Box. A. A distribution box, if used, must be of sufficient size to distribute effluent equally to the laterals of a trench or absorption bed system. The box must be constructed with the inlet invert at least one inch above the level of the outlet inverts. Flow equalizers or similar devices must be used to adjust the flow between laterals. Access to the box must be provided with a manhole riser with access lid at or above grade if the top of the box does not reach final grade. 1. Each lateral shall be connected separately to the distribution box. 2. The distribution box shall be watertight and all pipes shall be grouted or cemented. The box shall be located a minimum of five (5) feet from the septic tank. 3. The distribution box must be located outside of the absorption area. Solid wall pipe must be installed from the distribution box until the beginning of the absorption area. 4. In the event that treatment tank effluent is discharged to the distribution box by a pump, a baffle shall be installed in the distribution box. The baffle shall be secured to the bottom of the box, extending vertically to a point level with the crown of the inlet pipe, and shall be perpendicular to the inlet. In lieu of a baffle, the inlet pipe may have a ninety (90) degree bend which diverts effluent downwards into the distribution box. Sec; 30-9-70. Drop Box. In sequential or serial distribution, a watertight box may be used to transfer the effluent to the following trench when the effluent in a trench has received the designed level for overflow to the next trench. A drop box shall have a riser at or above final grade, if the top of the drop box does not reach final grade. Outlet pipes in sequential distribution must be designed and installed so that they may be capped off for resting periods. Sec. 30-9-80. Stepdown/Relief Pipe. In sequential or serial distribution, an unperforated pipe may be used to transfer the effluent to the following trench when the effluent in a trench has received the designed level for overflow from that trench. Sec. 30-9-90. Wastewater Pumping and Dosing Siphon Systems. A. Pumps. 1. Non -clog pump opening must have at feast two-inch diameter solids handling capacity where raw wastewater is pumped. A pump opening must not have more than 3/4 -inch diameter solids handling capacity if previously settled effluent is pumped. 2. Pumps must be certified to the applicable UL or CSA electrical safety standard, bear the seal of approval of CSA, UL or an equivalent testing program and be constructed of corrosion resistant materials. 3. Grinder pumps must also be certified to NSF/ANSI Standard 46 and bear the seal of approval of the NSF or equivalent testing and certification program. B. Floats and Switches. 1. Automatic liquid level controls must be provided to start and shut off pumps at a frequency or level specified in the design. 2. Floats must be mounted on a stem separate from the pump discharge piping to allow for removal, adjustment, and replacement of the float from grade without removing the pump. 3. Float switches must be certified to the applicable UL or CSA electrical safety standard, bear the seal of approval of CSA, UL or an equivalent certification program and be constructed of corrosion resistant materials. 4. Dosing siphons for pressure dosing and higher level treatment systems must provide for a means of determining the number of dosing events. C. Location of Pump or Siphon. 1. A pump or a siphon may be installed in a separate tank following the septic tank. The tank must be of sufficient volume to allow pump or siphon cycling commensurate with the design capacity. 2. The second compartment of a two -compartment septic tank may only be used as the pump tank when the tank is specifically designed for this purpose and it can be demonstrated to the satisfaction of the Division that the minimum 48 -hour detention time will not be decreased. The pump must be screened or provided with an approved filtering device to assure that only liquid effluent will be discharged. The transfer of liquid from the first to the second compartment must be at an elevation that is between the inlet and outlet invert elevations, and through a standard tee designed and located as per the requirements of section 30-9-20.D.4, Siphons must not be installed in the second compartment of a two compartment tank. 3 The use of a three -compartment septic tank, sized to provide the required effective volume in the first two compartments with the pump or siphon in the third compartment is acceptable for tanks specifically designed for this purpose. The transfer of liquid from the second to the third compartment must be at an elevation that is between the inlet and outlet invert elevation, and through a standard tee designed and located as per the requirements of section 30-9-20.D.4. D. Pump or Siphon Discharge Piping. 1. The discharge pipe from the pumping or siphon chamber must be protected from freezing by burying the pipe below frost level or sloping the pipe to allow it to be self - draining. Drainage must be provided through the bottom of the pump or through a weep hole located in the discharge pipe prior to exiting the tank. 2. The pump discharge piping must have a quick disconnect that is accessible from grade to allow for easy pump access and removal. 3. The pipe must be sized to maintain a velocity of two or more feet per second. 4. Pressure pipes must be designed to prevent air or vacuum locking and allow self draining of the pipes. E. Access. 1. The pump or dosing system tank, chamber, or compartment must have a minimum 24 -inch diameter access riser, made of corrosion -resistant material, extending to or above ground level. A smaller diameter riser may only be installed if it is accepted by the Water Quality Control Division as an integral component of a specific product during the product review process. 2. The access riser must have a watertight connection to the pump or dosing chamber/compartment to prevent infiltration or exfiltration. All other intrusions to the riser for electrical or other component access must also be watertight. F. Splice Box. 1. Splice boxes must be located outside the pump system access riser and be accessible from the ground surface. 2. Wire splices are prohibited inside the tank, dosing chamber or riser. Wire splicing must be completed with corrosion -resistant, watertight connectors. G. Controls. 1. Control panels or other electrical boxes used to control the functions of an OWTS must comply with the following, as appropriate: a. The pump system must have an audible and visual alarm notification in the event an excessively high water condition occurs. b. The pump must be connected to a control breaker separate from the high water alarm breaker and from any other control system circuits. An electrical disconnect must be provided within the line of sight of the pump chamber. c. The pump system must be provided with a means that will allow the pump to be manually operated. d. The pump system for pressure dosing and higher level treatment systems must have a mechanism for tracking both the amount of time the pump runs and the number of cycles the pump operates. e. Must bear the seal of a Nationally Recognized Testing Laboratory (NRTL), such as UL or ETL. Sec. 30-9-100. Effluent Screens. A. If a pump or dosing siphon is used to remove septic tank effluent from the final compartment of the septic tank, the effluent must be filtered prior to dispersal into the soil treatment area. An effluent screen, pump vault equipped with a filter cartridge, or a filter on the discharge pipe, would all be considered acceptable. B. The effluent screen, if used, must be cleaned at manufacturer -recommended intervals, or more often, if use patterns indicate. C. An alarm may be installed on an effluent screen indicating need for maintenance. D. Where an ejector pump, grinder pump or non -clog pump is proposed for use prior to the septic tank, an effluent screen must be installed on the outlet of the septic tank. E. The handle of the effluent screen must extend to within 12 inches of grade. Sec. 30-9-110. Grease Interceptor Tanks. A. All commercial food service facilities and other facilities generating fats, oils and greases in their waste must install a grease interceptor tank. B. Grease interceptor tanks shall treat only those portions of the total wastewater flow in which grease and oils are generated. C. The grease interceptor must have a minimum of two compartments and must be sized proportionate to the amount of fats, oils and grease it receives, the peak flow rate through the tank, and the expected cleaning frequency. D. The inlet and outlet tees or baffles must extend into the bottom 1/3 of the liquid volume, but must be at least 12 inches off the inside floor of the interceptor. E. The inlet and outlet tees or baffles must extend at least 5 inches above the liquid level and must provide for a free vent area across the liquid surface. ARTICLE X DESIGN CRITERIA - SOIL TREATMENT AREA Sec. 30-10-10. Soil Treatment Area General. A. The size and design of the soil treatment area must be based on the results of the site and soil evaluation, design criteria, and construction standards for the proposed site and OWTS selected. B. At proposed soil treatment area locations where any of the following conditions are present, the system must be designed by a professional engineer and approved by the Division: 1. For soil types, A, 4, 4A, 5, R-0, R-1 and R-2, as specified in Table 30-10-1 and 30- 10-1A of this egulation; 2. The maximum seasonal level of the ground water surface is less than four feet below the bottom of the proposed infiltrative surface; 3. A limiting layer exists less than four feet below the bottom of the proposed infiltrative surface; 4. The ground slope is in excess of thirty percent; or 5. Pressure distribution is used. Sec. 30-10-20. Calculation of Infiltrative Surface f Sof Tr atnient Are $_3 A. The infiltrative surface of a trench or bed receiving any treatment level of effluent is only the bottom area. No sidewall credit is allowed except in deep gravel trenches that are permissible in repairs. Long-term acceptance rates (LTARs) are shown in Table 30-10-1 and 30-10-1A. C. Factors for adjusting the size of the soil treatment area are in Tables 30-10-2 and 30-10- 3. D. The required area for a soil treatment area is determined by the following formula: Soil Treatment Area in square feet required = Design Flow in gallons per da LTAR (in gallons per day per square foot) 1. Adjusted Soil Treatment Area = Required Soil Treatment Area x Size Adjustment Factor(s). 2. Size adjustment factors for methods of application are in Table 30-10-2. 3. Size adjustment factors for types of distribution media are in Table 30-10-3. 4. A required soil treatment area may be multiplied by one size adjustment factor from Table 30-10-2, Table 30-10-3, or both. 5. A soil treatment area receiving 112, TL2N, 113, or TL3N effluent must be pressure dosed. Table 30-10-1 Soil Treatment Area Long-term Acceptance Rates by Soil Texture, Soil Structure, Percolation Rate and Treatment Level Soil Type, Texture, Structure and Percolation Rate Range Long Term Acceptance Rate (LTAR); Gallons per day per square foot Soil Type USDA Soil Texture USDA Soil Structure -Type USDA Soil Structure- Grade Percolation Rate (MPI) All Treatment Levels >35% Rock (>2mm): See Table 30-10-1A >35% Rock (>2mm): See Table 30-10-1A >35% Rock (>2mm): See Table 30-10-1A >35% Rock (>2mm): See Table 30-10-1A >35% Rock (>2mm): See Table 30 - 10-1A 1 Sand, Loamy Sand Single Grain 0 (Structureless) 5-15 0.80 2 Sandy Loam, Loam, Silt Loam PR (Prismatic) BK (Blocky) GR (Granular) 2 (Moderate) 3 (Strong) 16-25 0.60 2A Sandy Loam, Loam, Silt Loam PR, BK, GR Massive 1 (Weak) 0 (Structureless) 26-40 0.50 3 Sandy Clay Loam, Clay Loam, Silty Clay Loam PR, BK, GR 2, 3 41-60 0.35 3A Sandy Clay Loam, Clay Loam, Silty Clay Loam PR, BK, GR Massive 1 0 (Structureless) 61-75 0.30 4 Sandy Clay,Clay,lay, Silly PR, BK, GR 2, 3 76-90 0.20 Sandy Clay. Clay, Silty PRTBK GR 1 4A Clay Massive 0 (Structureless) 9'1=1-2U X3.15 5 Soil Types 2-4A Platy 1, 2, 3 121+ 0.10 aded areas require system design by a professional engineer. 1 Treatment levels are defined in Table 30-6-3. e Desi n Crit r afor TNT,, b e 30-1 1 s with High k c ; tent Tye "R" Soils) Soil T pe4 Percentage of Rock, LTA ution Percentage and Size of 0c k6 Soi9 Type' 1 with more than 35% Rock (>2mm) Soil Type7 2-5, >35%- 65% ock (>2mm); With >50% of the Rock <20 mm (3/4 inch) Soil Type7 2 and 2A, >35%-65% Rock (>2mm); With >50% of the Rock <20 mm (3/4 inch) Soil Type7 2-5, >65% Rock (>2mm), OR >50% of Rock >20mm (3/4 inch) axi (galls urn LTAR Id ay U nlined Sand Filter: 1.0 for "Preferred Sand Media:, 0.8 for "Secondary Sand Media" U se TL1 LTAR from Table 30-10-1 for the soil type corresponding to the soil matrix with a maximum LTAR of 0.8 The allowable LTAR's are defined in each individual treatment Bevel column in this table U se TL1 LTAR from Table 30-10-1 for the soil type corresponding to the soil matrix, with a maximum LTAR of 0.8 Ty,; e of Distributi equtired P ressure Distribution$ P ressure Distribution' P ressure Distribution' Timed, P ressure Distribution$ Required Sand or Media Depth .el give to th a°aualityoof Effluent p I i e to the istri buti i; System Treat., :,ent Level 16 Minimum 3 -foot deep U nlined Sand Filter Minimum 2 -foot deep U nlined Sand Filter Remove, mix, replace 4 feet of existing material; with a maximum LTAR Minimum 3 -foot deep U nlined Sand Filter 1. General guidance for Table 30-10-1A: The intent of the soil type R-0 is to define a materi I that consists of a high percentage of rock, or rock fragments, and has a percolation rate of less than 5 mpi. Soil types R-1 and R-2 consist of a high percentage of rock or rock fragments, but have a percolation rate of greater than 5 mpi. Soil types R-0 and R-2 are considered to be a "limiting layer". 2. No sizing adjustments are allowed for systems placed in type "R" soils. The maximum LT R's are provided in this table 3. The design of type "R" soil treatment systems must conform to sections 30-11-30.B and 4. All systems installed in a type "R" soil must be designed by a professional engineer. 5. The percentage of rock may be determined by a gradation conducted per ASTM standar s, or an appropriate field evaluation by volume. 6. Type "R" soil treatment systems that are designed per the criteria noted in the Treatment Level 1 column of this table do not require O/M oversight by the LPHA. 7. The "Percentage and Size of Rock" column references the soil types noted in Table 30-1 -1. 8. Design of the pressure distribution system for type "R" soils shall comply with the requirements of sections 30- 11-30 B. 2. a, b, c, d, and e. Sec. 30-10-30. Allowable Soil Treatment Area Sizing Adjustments. A. The soil treatment area size determined by dividing the design flow rate y the long-term acceptance rate may be adjusted by factors for soil treatment area de ign and type of distribution media. B. For the purpose of the table, a "baseline system," i.e. adjustment fa tor of 1.00, is considered to be Treatment Level 1 (TL1) applied by gravity to a gravel-fi led trench. Table 30-10-2 Size Adjustment Factors for Methods of Application in Soil Treatment Areas Type of Soil Treatment Area Method of Effluent Application from Treat Preceding Soil Treatment Area ent Unit Gravity Dosed (Siphon or Pump) Pressure Dosed Trench 1.0 0.9 0.8 Bed 1.2 1.1 1.0 Table 30-10-3 Size Adjustment Factors for Types of Distribution Media in Soil Treatm nt Areas Type of Soil Treatment Area Type of Storage/Distribution Media Used in S Area it Treatment Category 1 Category 2 Cregory 3 Rock or Tire Chips Other Manufactured Media Chambers or E hanced Ma ufactured Media Trench or Bed 1.0 0.9 0.7 1. All proprietary distribution products must receive acceptance and the applicable reduction through Colorado Water Quality Control Division review per the applicable requirements of Regulation 43 section 43.13. Sec. 30-10-40. Design of Distribution Systems. A. General 1. The infiltrative surface and distribution laterals must be level. 2. The infiltrative surface must be no deeper than four feet below grade unless. The depth of the infiltrative surface will be measured on the up -slope side of the trench or bed. 3. Trenches must follow the ground surface contours so variations in infiltrative surface depth are minimized. Beds must be oriented along contours to the degree possible. 4. Pipe for gravity distribution must be no less than three inches in diameter. 5. A final cover of soil suitable for vegetation at least ten inches deep must be placed from the top of the geotextile or similar pervious material in a rock and pipe system, chamber, or manufactured media up to the final surface grade of the soil treatment area. 6. Following construction, the ground surface must be graded to divert stormwater runoff or other outside water from the soil treatment area. The area must be protected against erosion. Subsurface drains upslope of the soil treatment area may be installed to divert subsurface flow around the area. Subsurface drains must meet the minimum horizontal separation distances from components of the OWTS as specified in Table 30-7-1. 7. Backfilling and compaction of soil treatment areas must be accomplished in a manner that does not impair the intended function and performance of the storage/distribution media and soil and distribution laterals, allows for the establishment of vegetative cover, minimizes settlement and maintains proper drainage. 8. Dosing may be used for soil treatment area distribution. The dose must be sized to account for the daily flow and the dosing frequency. B. Distribution Laterals; Must meet the requirements of section 30-9-40 as applicable. 1. Distribution between laterals in a soil treatment area must be as level as possible. Uneven settling of portions of the distribution system following construction must be addressed by provisions in the design to adjust flows between laterals. 2. The maximum length of distribution laterals must not exceed 150 feet. 3. Distribution laterals longer than 100 feet must be pressure dosed or the application of the effluent must be at the center of the lateral through a distribution box. 4. For absorption beds, the separating distance between parallel gr vity distribution laterals must not exceed six feet (center -to -center), and a distributio lateral must be located within three feet of each sidewall and endwall. 5. The end of a distribution pipe must be capped, unless it is in a bed or trenches in a level soil treatment area, where the ends of the lines may be looped. 6. To promote equal distribution to the soil treatment area, the forcemaii must be connected to as near to the middle of the distribution hea However, it must be offset from any distribution lateral to prevent prei i or effluent pipe der as possible. erential flow. 7. Orifices must be oriented downward unless pressure distribution is us and provision for pipe drainage is included. C. Pressure Distribution 1. Design of pressure distribution systems must include: a. Dose size and frequency for either proposed flows and soil type, r media long- term acceptance rate; b. Pipe diameter and strength requirements; c. Orifice size and spacing; d. A 30 — 72 inch operating head at the distal end orifice; e. Pump/siphon information; Total Dynamic Head; gallons/minute; f. Drain -back volume from forcemain; and g. Calculations, or a design software reference, that indicates the se component sizing will provide equal flow within each active zone distribution system, and provide no more than a 10% flow differen initial orifice to the most distal end orifice within each zone. 2. The separating distance between parallel distribution pipes in a pressi absorption bed must not exceed four feet, and the outer distribution pi located within two feet of each sidewall and endwall. Specific requiren design of sand filters are noted in section 30-11-30.B. 3. Flushing assemblies must be installed at the distal end of each lateral accessible from finished grade. A sweeping 90 degree or bends limite must be provided. Sec. 30-10-50. Soil Treatment Area Requirements A. Trenches. 1. Trenches must be three feet wide or less. ected f the :ial from the are distribution pe must be cents for the and be 1 to 45 degree 2. The separating distance between trenches must be a minimum of four feet sidewall- to-sidewall. 3. Distribution laterals used in a trench must be as close to the center of the trench as possible. B. Beds. 1. Maximum width for a bed shall be 12 feet, unless the bed receives effluent meeting Treatment Level 2 quality or better. 2. The separation distance between beds must be a minimum of six feet sidewall-to- sidewall. C. Serial and Sequential Distribution: 1. A serial or sequential distribution system may be used where the ground slope does not allow for suitable installation of a single level soil treatment area unless a distribution box or dosing chamber is used. 2. The horizontal distance from the side of the absorption system to the surface of the ground on a slope must be adequate to prevent lateral flow and surfacing. 3. Adjacent trenches or beds must be connected with a stepdown/relief pipe or a drop box arrangement such that each trench fills with effluent to the top of the gravel or chamber outlet before flowing to succeeding treatment areas. D. Alternating Systems. 1. An alternating system must have two or more zones that must be alternated on an annual or more frequent basis. 2. For repairs, each section must be a minimum of 50 percent of the total required soil treatment area. For new installations, each separate soil treatment area must meet the minimum sizing requirements of this regulation. 3. A diversion valve or other approved diversion mechanism that requires the owner or operator to manually alternate zones of the OWTS may be installed on the septic tank effluent line allowing soil treatment area sections to be alternated. 4. The diversion mechanism must be readily accessible from the finished grade. E. Sequencing Zone Systems. 1. Sequencing zone systems have two or more soil treatment area sections that are dosed on a frequent rotating basis. 2. Where soil conditions are similar between the sections, each section area must be the same size. If soil conditions are such that long-term acceptance rates are different, each section may be sized for the same dose, but different long-term acceptance rates. 3. An automatic distribution valve must be used. 4. Dosing of each system must be evaluated by the design engineer based on projected daily flow rates, number of zones, and soil types. F. Inspection Ports 1. A 4 -inch inspection port accessible from ground surface must be installed at the terminal end of each lateral in a trench system and at each corner of a bed system. The bottom of the inspection port tube must extend to the infiltrative surface and not be connected to the end of the distribution pipe. 2. Inspection ports in chambers may be installed according to manufacturer's instructions if the infiltrative surface is visible and effluent levels can be observed from the inspection port. 3. Additional inspection pods connected to distribution pipes may be installed. 4. The top of the inspection ports may be terminated below the final grade if each is housed in a component such as a valve box for a lawn irrigation system and has a removable cover at the ground surface. Sec. 30-10-60. Storage/Distribution Media A. Rock and Pipe 1. The perforated pipe must be surrounded by clean, graded gravel, rock, or other material of equal efficiency which may range in size from 1/2 inch to 2 1/2 inches. AASHTO M 43 size No. 3 coarse aggregate meets this specification. 2. At least six inches of gravel, rock or other material must be placed below the pipe. The gravel, rock or other material must fill around the pipe and be at least two inches above the top of the distribution pipe. 3. The top of the placed gravel or such material used must be covered with non -woven permeable geotextile meeting a maximum thickness rating of 2.0 ounces per square yard or equivalent pervious material. An impervious covering must not be used. B. Chambers 1 Chambers must be installed with the base of the unit on in -situ soil or, if placed on acceptable media, the manufacturer's installation instructions must be followed so as to prevent chambers from settling into the media. 2. Installation must be according to manufacturer's instructions. 3. Effluent may be distributed by gravity, pump or siphon. 4. If the width of a proprietary manufactured distribution product is within 90 percent of the width of the excavation, it may be approved as being equivalent to the full width of the excavation, if information is provided that demonstrates distribution of the full width. Thus, the product must cover at least 90 percent of the excavated area in either a trench or bed configuration in order to receive sizing adjustments provided in Table 30-10-3. C. Media, Enhanced, or Other Manufactured 1. Manufactured media must be installed with the base on the in -situ soil or placed on acceptable media meeting the manufacturer's specifications for proprietary distribution products or combined treatment/distribution products. 2. Installation must be according to manufacturer's instructions. 3. Pressure distribution is required for TL2-TL3N effluent, unless otherwise noted in this regulation. D. Driplines 1. The infiltrative surface area must be calculated using the long-term acceptance rate for the site or a more conservative value if recommended by the manufacturer. 2. Driplines must be installed on manufacturer's spacing recommendations. 3. Drainback must be provided for all drip lines, pipes and pumps. 4. Provisions must be made to minimize freezing in the distribution pipes, driplines, relief valves, and control systems. 5. Provisions must be made for filtering, back -flushing, or other cleaning. E. Tire Chips 1. The pipe may be surrounded with clean, uniformly -sized tire chips. 2. Tire chips must be nominally two inches in size and may range from 1/2 inch to a maximum of four inches in any one direction. 3. Wire strands must not protrude from the tire chips more than 0.75 inches. 4. Tire chips must be free from balls of wire and fine particles less than two mm across. 5. The top of the tire chips used must be covered with non -woven permeable geotextile meeting a maximum thickness rating of 2.0 ounces per square yard or equivalent pervious material. An impervious covering must not be used. Sec. 30-10-70. Lift Stations. Lift stations intended solely for the purpose of delivering sewage to a septic tank or septic tank effluent to a standard soil treatment area that is located such that it is not possible to provide gravity flow from the septic tank to the soil treatment area are not required to be designed by a professional engineer. The systems installer shall submit to the Division a pmp information form, provided by the Division, for documentation. Sec. 30-10-80. Soil Replacement. A. The construction of a soil replacement system is permitted to bring the oil treatment area into compliance with the requirements of this regulation 1. When a soil type "R" is removed, the following requirements must be met: a. All added soil must comply with the following specifications: (1) Added soil must meet the specifications of either "preferred" or "secondary" sand filter media, as specified in section 30-11-30 B.4. (2) The long-term applicable rates as specified in Table 30-10-1A must be used. No additional sizing adjustments are allowed. (3) The depth of the added media must comply with the requirements of Table 30-10-1A. (4) A gradation of the sand media used must be provided. The gr dated no more than one month prior to the installation date. H gradation of the actual material placed in the excavation is re dation must be wever, a >mmended. (5) All added soil must be completely settled prior to installation o components as specified and approved by the design engineer. (6) Pressure distribution must be used. 2. The removal and reinstallation of in -situ soil may only be allowed whe determined to be a soil type "R-1" (Option 2). The design must comply requirements for this soil type noted in Table 30-10-1A (Soil Type R-1 3. When a sand media is added to soil treatment area or to an excavatio type 1-5 (Table 30-10-1) is the underlying soil, the following requiremE met: a. Added soil must meet the specifications of either "preferred" or "s filter media, as specified in section 30-11-30 B.4. b. Unless the design follows the criteria for a sand filter or mound sy required in section 30-11-30, the TL1 long-term acceptance rate f soil must be used. e the soils are with the Option 2). n where a soil nts must be c. A gradation of the sand media used must be provided. The gradati dated no more than one month prior to the installation date. Howe gradation of the actual material placed in the excavation is recomn condary" sand tem design as r the receiving on must be er, a vended. d. All added soil must be completely settled prior to installation of co ponents. Sec. 30-10-90. Repairs. A. When space is not available or if there are other site limitations that preclude other soil treatment area options for OWTS repairs, wide beds, deep beds and deep gravel trenches may be considered for repairs only. Other options are vaults (in accordance with Section 30-12-40) or higher level treatment systems. B. Repairs to failing systems must conform to setbacks identified in Table 30-7-1 when possible. When this is not possible using all available methods described above, the jurisdiction with authority may permit reductions to setbacks. At no point will a setback reduction be approved by the jurisdiction less than what the existing separation is to existing OWTS. In maximizing this setback distance, all methods available in section 30- 10-90 A. must be utilized including but not limited to the use of Higher Level Treatment, wide beds, etc., where allowed. Any setback reduction beyond what the existing failing system presents must be approved by the local board of health as outlined in section 30- 4-140. C. Wide Beds: For repairs, beds may be wider than 12 feet without being required to receive effluent meeting Treatment Level 2 quality or better. D E F Deep Beds: For repairs, the infiltrative surface of a bed may be no deeper than five feet. Size adjustments as provided for in Tables 30-10-2 and 30-10-3 must not be applied. System sizing will be based strictly on the soil type and corresponding LTAR. Deep Gravel Trenches 1. The length of an absorption trench may be calculated by allowance for the sidewall area of additional depth of gravel in excess of six inches below the bottom of the distribution pipe according to the following formula: Adjusted Length = L x (W+2) (W+1+2D) Where: L = length of trench prior to adjustment for deep gravel W = width of trench in feet D = additional depth in feet of gravel in excess of the minimum required six inches of gravel below the distribution pipe 2. Maximum allowable additional depth is five feet. 3. Percolation tests or soil profile test pit excavations must be performed at the proposed infiltrative surface depth. 4. Size adjustments as provided for in Table 30-10-2 and 30-10-3 must not be applied to deep gravel trenches. Wastewater Ponds. 1. Construction of new wastewater ponds is prohibited. 2. For repairs of an existing wastewater pond, the potential for risk to public health and water quality may be evaluated by the local public health agency. If risk is low in the determination of the local public health agency, the repair of a wastewater pond may be permitted, however the following criteria must be followed: a. A septic tank must precede the wastewater pond. b. The depth of the design volume of the wastewater pond must be at least five feet. c. A wastewater pond must have two feet of free board above the design volume of the pond. d. A wastewater pond must be fenced to keep out livestock, pets, vermin, and unauthorized people. e. Wastewater ponds must be designed on the basis of monthly water balance including design flow, precipitation, evaporation, and seepage. f. Wastewater ponds must be constructed so the seepage out of the bottom or sides does not exceed 1/32 of an inch per day. If this limit cannot be achieved using compacted natural soil materials including soil additives, an impermeable synthetic membrane liner must be used. g. If the evapotranspiration does not exceed the rate of inflow of effluent from the structure, a soil treatment area meeting the requirements of this regulation must be installed to accept the excess flow. h. Maintenance must include preventing aquatic and wetland plants from growing in or on the edge of the pond, protecting sides from erosion, and mowing grasses on the berm and around the pond. i. Wastewater ponds must be designed by a professional engineer. G. Vaults. 1. The allowable use of vaults for repairs must meet the criteria specified in Section 30- 12-20 of this Regulation. H. Higher Level Treatment Options. 1. Design criteria for higher level treatment systems are in Article Xl. ARTICLE Xl DESIGN CRITERIA - HIGH LEVEL TREATMENT SYSTEMS Sec. 30-11-10. General. A. Higher level treatment systems must be designed by a professional engineer. B. Higher level treatment systems may be public domain technology systems or proprietary systems. 1. Public domain technology systems must be designed, installed and maintained according to established criteria. When design criteria are not specifically provided in this Regulation, the criteria used in the design must be from a reference commonly used as an industry standard and the criteria must be cited in the design. 2. Proprietary systems must be designed, installed, and maintained according to manufacturer's instructions and must have received review and acceptance by the Water Quality Control Division. C. Soil treatment areas for higher level treatment systems must be pressure dosed. D. Systems must be capable of accommodating all anticipated flows and organic loads. E. Ventilation and air systems: Mechanical components must be installed in a properly vented location and all vents, air intakes, and air hoses must be protected from snow, ice, or water vapor accumulations. F. Covers, barriers, or other protection: All systems must be installed to include protection of openings against entry of insects, rodents, other vectors and unauthorized people. Sec. 30-11-20. Treatment Levels. The treatment levels identified in Table 30-6-3 are specified in this Section for public domain technology, and proprietary treatment systems will be assigned a treatment level approved by the Water Quality Control Division. Adequate maintenance and operation plan as required by the Water Quality Control Division must be submitted to the Division. Sec. 30-11-30. Sand Filters. A. A lined or unlined intermittent sand filter, or recirculating sand filter, may be used as a higher level -treatment system prior to dispersing the effluent into a soil treatment area. B. Intermittent (Single Pass) Sand Filters; General Requirements 1. The treatment level for intermittent sand filters is considered TL3. 2. General Design Parameters: Not all combinations of the variables noted below will result in a proper distribution system design. The design engineer must justify through calculations or design software that the selected values will concur with industry standards. a. Distribution pipe size: 3/4 inch — 1.5 inches (PVC Class 200, min.) (1) 2 inch distribution pipe may only be used where other design modifications cannot overcome a greater than 10% variation in the pressure head between the initial and distal orifices. (2) Distribution pipe spacing: 18 inches — 48 inches (3) Orifice size: 1/8 inches — 3/8 inches (Also see section 30-11-30 E.1. below) (4) Orifice spacing: 18 inches — 48 inches (5) Operating head at the distal end of distribution pipes: 30 inches — 72 inches (60 inches typ.). Larger orifices allow for an operating head at the lower end of this range, while smaller orifices will necessitate an operating head at the higher end of this range. 3. Dosing: a. Pressure distribution is required. The design of the distribution system must also comply with the requirements of 30-10-40 C.1. b. Number of cycles/day: Will vary with design (Short, frequent doses are preferred.) c. Proposed dose volume: Will vary with design (0.25 - 1.0) gallons/orifice/dose, or 3-5 times distribution pipe volume d. Timed dosing is recommended where design considerations allow. 4. Sand Filter Treatment Media a. The depth of the sand media below the distribution system must be at least 24 inches unless otherwise noted in Table 30-10-1A for type "R" soils. b. "Preferred" sand media requirements: 1) Effective size: 0.25-0.60 mm 2) Uniformity coefficient: ≤ 4.0 3) Percent fines passing #200 sieve: ≤ 3.0 c. "Secondary" sand media requirements: 1) Effective size: 0.15-0.60 mm 2) Uniformity coefficient: ≤7.0 3) Percent fines passing #200 sieve: ≤ 3.0 d. A gradation of the sand media used must be provided. The gradation must be dated no more than one month prior to the installation date. However, a gradation of the actual material placed in the excavation is recommended. 5. Gravel Requirements a. Clean, graded gravel, or rock, must range in size from 1/2 inch to 2 1/2 inches. AASHTO M 43 size No.3 coarse aggregate meets this specification. 1) The gravel must surround the distribution pipes used to disperse the effluent and must be at least 6 inches below and 2 inches above the pipes. 2) Water Quality Control Division accepted manufactured media may be used as an alternative to specified gravel. 6. Filter Fabric Requirements a. The top layer of gravel must be covered with a non -woven permeable geotextile fabric meeting a maximum thickness rating of 2.0 ounces per square yard or equivalent pervious material. 7. Final Cover Material a. 8 inches — 10 inches of Type 1 or 2 soil with an additional 2 inches top soil 8. Size adjustment factors provided in Tables 30-10-2 and 30-10-3 are not applicable for sand filters. 9. Sand filters must not be used to treat wastewater that does not conform to TL1 treatment level or better. C. Unlined (Open Bottom) Sand Filters. 1. All requirements for 30-11-30 B. 1-9 will apply to unlined sand filters. 2. Application rates: a. Maximum hydraulic loading rate for TL1 effluent applied to "Preferred Sand Media" in an unlined sand filter is 1.0 gal./sq.ft./day, or the long- term acceptance rate of the receiving soil for TL1 (Table 10-1) whichever results in the larger area. b. Maximum hydraulic loading rate for TL1 effluent applied to "Secondary Sand Media" in an unlined sand filter is 0.8 gal./sq.ft./day, or the long term acceptance rate of the receiving soil for TL1 (Table 1 OA) whichever results in the larger area. c. Maximum hydraulic loading rate for TL2, TL2N, TL3, or TL3N effluent applied to "Preferred" or "Secondary" Sand Media in an unlined sand filter must be the long- term acceptance rate of the receiving soil for TL1, (Table 10-1). 3. The upper infiltrative surface of an unlined sand filter receiving TL1 — TL3N effluent must be at least three feet above a limiting layer. D. Lined Sand Filters 1. All requirements of 30-11-30 B.1-9 will apply to unlined sand filters. 2. Application rates: a. Hydraulic loading rate for TL1 effluent applied to "Preferred Sand Media" in a lined sand filter is 1.0 gal./sq.ft./day. b. Hydraulic loading rate for TL1 effluent applied to "Secondary Sand Media" in a lined sand filter is 0.8 gal./sq.ft./day. 3. The minimum depth of the sand media in a lined sand filter must be two feet. 4. An intermediate layer of pea gravel, two inches in thickness, must be placed between the sand filter media and the course under -drain media to prevent the migration of sand into the lower layer of under -drain gravel. ASTM C 33, No. 8, coarse aggregate meets this specification. 5. A minimum four -inch diameter slotted SCH40 PVC under -drain pipe must be used to collect the treated effluent. The under -drain pipe must be installed in the center of a 5 inches thick bed of washed, graded gravel, or rock ranging in size from 1/2 inch to 2 1/2 inches. AASHTO M 43, No.3 coarse aggregate meets this specification. Lined sand filters must have an impervious liner on the sides and bottom of the filter. The liner must consist of a minimum 30 mil thick PVC material or equivalent. 6. Effluent collected by the under -drain must be dispersed to a soil treatment area. The soil treatment area may be sized with a maximum long-term acceptance rate of the receiving soil for TL1 effluent. E. Recirculating Sand Filter, Minimum Requirements: 1. Treatment level: a. Treatment level provided within recirculating sand filters is TL3. 1) General Design Parameters: Not all combinations of the variables noted below will result in a proper distribution system design. Engineer must justify through calculations or design software that the selected values will concur with industry standards. b. Distribution pipe size: 3/4 inch — 2 inches (PVC Class 200, min.) c. Distribution pipe spacing: 18 inches — 36 inches (24 inches typ.) d. Orifice size: 1/8 inch —'/4 inch e. Orifice spacing: 18 inches — 36 inches (24 inches typ.) f. Pressure head at end of distribution pipe: 24 inches — 72 inches (60 inches typ.) 2. Dosing: a. Timed dosed, pressure distribution is required. The design of the distribution system must comply with the requirements of section 30-10-40 C.1. b. Recirculation ratio: 3:1 — 5:1 c. Gallons/orifice/dose: 1 — 3 (2.0 typ.) d. Hydraulic loading: 3 - 5 gal./sq.ft./day (4 — 5 typ.) e. Dosing time "ON"; <2.5 min. (<2.0 typ.) f. Number of cycles/day: 48 — 120 3. Top gravel requirements: a. Washed, graded gravel, or rock, must range in size from 112 inch to 2 1/2 inches. AASHTO M 43, No.3 coarse aggregate meets this specification. b. The gravel must surround the distribution pipes used to disperse the effluent and must be at least 6 inches below and 2 inches above the pipes. c. State accepted manufactured media may be used as an alternative to specified gravel. d. Soil cover is prohibited. The upper gravel layer must be open to the atmosphere. 4. Filter media requirements: a. Effective size: 1.5 — 2.5 mm b. Uniformity coefficient: ≤ 3 c. Fines passing #200 sieve: ≤ 1.0 d. Media depth (min.): ≥24 inches 5. Intermediate gravel layer: a. An intermediate layer of pea gravel, two inches in thickness, must be placed between the coarse underdrain media and the sand filter media to prevent the migration of sand into the lower layer of under -drain gravel (ASTM C 33, No. 8, coarse aggregate). 6. Under -drain requirements: a. A minimum four -inch diameter slotted SCH40 PVC under -drain pipe must be used to collect the treated effluent. The under -drain pipe must be installed in the center of a 5 inches thick bed of washed, graded gravel, or rock ranging in size from 1/2 inch to 2 1/2 inches. AASHTO M 43, No.3 coarse aggregate meets this specification. 7. PVC liner requirements: a. Lined sand filters must have an impervious liner on the sides and bottom of the filter. The liner must consist of a 30 mil thickness PVC material or equivalent. b. Effluent collected from the recirculating sand filter must be discharged to a soil treatment area. The soil treatment area may be sized with a maximum long-term acceptance rate of the receiving soil for TL1 effluent. Sec. 30-11-40. Mound Systems A. When the infiltrative surface area of the media receiving wastewater effluent is at or above the natural ground surface at any point, it shall be considered a mound system. B. Mound systems that provide a minimum of 24 inches of sand treatment media may use the application rates for the in -situ receiving soil for TL1 effluent (Table 10-1). Size adjustment factors within Table 30-10-3 may be applied if TL1 application rates are used. C. Mound systems must conform to the design requirements of sections 30-11-30 C.1-5 for unlined (open bottom) sand filters, with the following exceptions. 1. A mound system may include less than 24 inches of imported sand media on a site where a lesser depth of sand media is sufficient to meet vertical separation requirements above a limiting layer. Application rates for the in -situ receiving soil for TL1 effluent must be used when less than 24 inches of sand media is used, unless higher level treatment is provided prior to dispersal into the mound system. 2. For the design of a mound system where less than 24 inches of sand media is proposed, and application rates for TL1 are used, the size adjustment factors within Table 30-10-3 may be used. D. The basal area must be determined using the LTAR from Table 30-10-1 for the in -situ receiving soil under the mound. E. Linear loading rates must be determined. The evaluation of many factors is required for an accurate determination of the linear loading rate. While application rates for the in -situ receiving soil under the mound is a main component, placement on the slope, and percent of slope must also be addressed when defining the linear loading rate. If the movement of the effluent is primarily vertical, then the linear loading rate is not as critical. However, if the movement of the effluent will be primarily horizontal, as would be expected in soil types 3A through 5 (Table 30-10-1), then the linear loading rate is extremely important and long narrow mounds are strongly recommended. 1. When TL1 effluent is applied to the distribution media of a mound system installed above in -situ soil types 1 through 3 (Table 30-10-1) and R-0 through R-2 (Table 30- 10-1A), the suggested linear loading rate is between 6 gpd/lin.ft. and 12 gpd/lin.ft. The maximum width of the distribution media in a mound system installed above these soil types is 12 feet when TL1 effluent is applied to the distribution media of a mound system. 2. When TL2 through 3N effluent is applied to the distribution media of a mound system installed above in -situ soil types 1 through 3 (Table 30-10-1) and R-0 through R-2 (Table 30-10-1A), the linear loading rate may exceed 12 gpd/lin.ft.; subsequently the mound may be wider than 12 feet. 3. When TL1 through TL3N effluent is applied to mound systems installed above in -situ soil types 3A through 5 (Table 30-10-1), the suggested linear loading rate is between 3 gpd/lin.ft. and 5 gpd/lin.ft. The maximum width of the distribution media in a mound system placed above these soil types is 12 feet. F. The final cover over a mound system must extend at least twelve inches horizontally beyond the perimeter of the distribution media prior to sloping down to existing grade. The final slope of the mound must be no greater than three feet horizontal to one foot vertical. G. The surface of the mounded area must be planted with a suitable vegetative cover. H. A suggested reference for the design and installation of mound systems is, "The Wisconsin Mound Soil Absorption System: Siting, Design, and Construction Manual, January 2000". Note that this is suggested guidance, and where the requirements of this regulation differ from those in the referenced mound document, the requirements of this regulation will govern in those cases. Sec. 30-11-50. Rock Plant Filter (Constructed Wetland) Treatment Before a Soil Treatment Area. A. A rock plant filter system must be designed by a professional engineer. B. The design must be site specific and include specifications for: loading, capacity, dimensions, liner material, filter media, effluent depth and depth control mechanism, density and species of plant material, instructions for maintenance and other pertinent information as requested by the Division. C. The treated effluent from a rock plant filter must be distributed to a soil treatment area. D. Although producing higher level treatment, rock plant filters must not be assigned a treatment level higher than TL1 because of system and seasonal variability. ARTICLE XII DESIGN CRITERIA - OTHER FACILITIES Sec. 30-12-10. Evapotranspiration and Evapotranspiration/Absorption Systems. A. Non -Pressurized Drip Dispersal System (NDDS): 1. An NDDS is considered a type of evapotranspiration/absorption system. However as specific design criteria is provided for an NDDS, they are exempt from the additional requirements of section 30-12-10 B, C and D. 2. The Colorado Professionals in Onsite Wastewater Guidelines for the Design and Installation of Non -Pressurized Drip Dispersal Systems (NDDS), September, 2016 is the procedural guideline in the design of a NDDS and must be followed when an NDDS is proposed. 3. The width of an NDDS system may be wider than 12 feet. The following section provides general criteria which must be followed when an evapotranspiration or evapotranspiration/absorption bed is proposed. 1 The design may only be permitted in arid climates where the annual evaporation rate exceeds the annual precipitation rate by more than 20 percent, and where site characteristics dictate that conventional methods of effluent dispersal are not appropriate. 2. The design may only be permitted in soil types 4, 4A and 5. 3. The system must be designed by a professional engineer. 4. If data for the Pan Evaporation Rate is provided, it must be multiplied by 0.70, or less, to obtain the equivalent Lake Evaporation Rate. 5. The width of the bed may be wider than 12 feet. 6. The required capillary or wicking sand must meet the gradation requirements in Table 12-1 and be approved by the design engineer. This sand is to be covered by a crowned, thin layer of loamy -sand mix and appropriate vegetation that will assist in drawing the water to the surface. 7. Adjustment factors as provided in Tables 30-10-2 and 30-10-3 must not be used. `?ice' ra a t i n i c k i i Table 31=12-1 Sand for Evapotr s1 irati .n ,e,'s (Fine Sa Sieve Siz Percent Passing 4 100 40 50-70 200 <15 C. For systems designed strictly as an evapotranspiration bed, the following criteria must be met: 1. Design data to be furnished must include, but shall not be limited to: system dimensions, distribution system design, specifications of distribution media and wicking sand, liner material if used, bedding, properties of the soil under the system, vegetation cover, and a water balance calculation including annual precipitation and storage requirements for periods of the year when evapotranspiration does not occur. 2. The following formula must be used for determining the minimum area necessary for total evapotranspiration of septic tank effluent: Area (in square feet)* = Design Flow (in gallons per day) x 586 Lake Evaporation Rate at the Site (in inches per year) * Additional area may be required based on the annual water balance calculations. 3. Designs will include a rock and pipe, or other Water Quality Control Division approved proprietary distribution product, with the centerline of the distribution system 6 to 8 feet on center. A thin non -woven fabric may be placed above the distribution system. Capillary wicking of the effluent is accomplished by a uniform depth layer of the specified sand media (capillary wicks), no more than 24 inches deep, placed between and above the distribution media. The base of the evapotranspiration bed may be no more than 30 inches below finished grade. 4. Capillary wicks which penetrate between the distribution system to the bottom of the bed, must be at least 15 percent of the bed surface area. The wicks must be uniformly spaced throughout the system. 5. Except for dwellings, if the system is designed for summer use only, the surface area may be multiplied by 0.6 to obtain the required area. D. For systems designed as an evapotranspiration/absorption bed, the following criteria must be met. 1. Data to be furnished must include, but is not limited to: system dimensions, distribution system design, specifications of wicking sand, properties of the soil under the evapotranspiration/absorption bed, provision for vegetation cover, and a water balance calculation including annual precipitation and storage requirements for periods of the year when evapotranspiration does not occur. 2. Design will include a rock and pipe, or other Water Quality Control Division approved proprietary distribution product, with the centerline of the distribution system 6 to 8 feet on center. A thin non -woven fabric may be placed above the distribution media. Capillary wicking of the effluent is accomplished by a uniform depth layer of the specified sand media (capillary wicks) no more than 24 inches deep placed between and above the distribution media. The infiltrative surface may be no more than 30 inches below finished grade. 3. Capillary wicks which penetrate between the distribution system to the bottom of the bed, must be at least 15 percent of the bed surface area. The wicks must be uniformly spaced throughout the bed. 4. Amount of storage and evapotranspiration capacities may be reduced by the volume of effluent absorbed by the underlying soil based on the long-term acceptance rate for that soil type and the formulas provided in section 30-12-10 D.5. below. 5. The following formula must be used for determining the minimum area necessary for evapotranspiration/absorption of septic tank effluent: Area (sq. ft.)* = Flow (gpd) (LTAR + ETR) a. LTAR refers to the long-term acceptance rate of the underlyin soil as provided in Table 30-10-1 for TL1 effluent. b. ETR refers to the evapotranspiration rate derived from the fo►Iwing formula: ETR (gal./day sq. ft.) = Lake Evaporation Rate at the Site (in inches per year) 586 * Additional area may be required based on the annual water bala co 30-12-20. Vaults other than Vault Privies. ce calculations. A. Vaults for full time use in new construction are prohibited where property can accommodate an OWTS with a soil treatment area. B. Vaults may be permitted under the following conditions: 1. Where there is limited use occupancy on a property which cannot a cornmodate an OWTS with soil treatment area. 2. If the facility is on land where the installation of an OWTS with soil tr atment area is not permitted. 3. Where there is only a temporary water source available (bottled wate , cistern). 4. Temporary use for on -location construction offices (mobile offices) of to exceed 6 months. 5. Low flow commercial uses that are temporary, such as gravel mining perations. 6. Seasonal recreational facilities where use is no more than 6 months er year. 7. A vault system variance approved by the Board of Public Health. 8. Where some of the wastewater flows are separated, such as toilet wa tes only, into a vault. The portion not retained in the vault must be treated in an a equately sized OWTS. C. A vault must have a minimum 500 gallon effective volume or be capa minimum of the 48 hour design wastewater flow, whichever is larger. D. A visual and audible signal device, indicating filling to a maximum of 75 p must be installed to indicate when pumping is necessary. E. Concrete vaults must meet the strength and watertightness requirements Prefabricated fiberglass, fiberglass -reinforced polyester, and plastic tan as vaults, if the tank manufacturer provides testing criteria certifying them le of holding a rcent capacity, or septic tanks. s may be used for this use. F. Contents of the vault must be pumped by a Weld County licensed systems cleaner, and records of maintenance and proper disposal shall be maintained by the owner and available for review by the Division. 6) Sec. 3 4 =0m vault Privies. A. Effective volume of the vault privy must be no less than 400 gallons and it must be constructed of concrete or plastic. The vaults for privies must meet the structural and watertightness standards of vaults. B. A vault privy must be built to include: fly- and rodent -tight construction, a superstructure affording complete privacy, an earth mound around the top of the vault and below floor level that slopes downward away from the superstructure base, a floor, and a riser of concrete or other impervious material with hinged seats and covers of easily cleanable, impervious material. All venting must be fly -proofed with No. 16 or tighter mesh screening. C. A signal device is not required for a vault privy. D. A permit fee, as set by the Board of County Commissioners, shall be required of applicants for any system that requires only a vault or holding tank. An application for an OWTS permit must be completed by the owner and a final inspection must be made by the Division with proper notice as specified in Section 30-4-70. � co 3042-40. lnci . A&rating, Co postin n Che ical Toil tsa A. The use of an incinerating, composting or chemical toilet will not reduce the required size of the OWTS as noted in Section 30-8-10. B. lnciner ting and composting toilets may be permitted. Incinerating and composting toilets shall bear the seal of approval of the NSF or an equivalent test and certification program. C. Permitting of an incinerating or corposting toilet may also be subject to the jurisdiction of a local agency regulating plumbing or the Colorado Plumbing Board, whichever has jurisdiction over plumbing in the location. D. An incinerating or composting toilet may be used for toilet waste where an OWTS is installed for treating wastewater remaining after removal of toilet waste. Subject to Board of Public Health, or other applicable regulations or codes (e.g., Colorado Plumbing Code if a local code does not exist), the compartment may be located within a dwelling or building provided the unit complies with the applicable requirements of this Regulation, and provided the installation will not result in conditions considered to be a health hazard as determined by the Division. Compartment and appurtenances related to the unit must include fly -tight and vector -proof construction and exterior ventilation. E. Incinerating Toilets: An approved incinerating toilet must be designed and installed in accordance with all applicable federal, state, and local air -pollution requirements and manufacturer's instructions. 1. Incinerating Toilets Acceptance Requirements a. Incinerating toilets must meet the requirements of the NSF Prot® of P157 and beer the seal of approval of the NSF or an equivalent testing and edification program. b. Incinerating toilets must be operated according to manufacturer's specifications. F. Composting Toilets. 1. Composting toilets must meet the requirements of NSF/ANSI Stand rd 41 and bear the seal of approval of the NSF or an equivalent testing and certificati n program. 2. An approved composting toilet must treat deposits of feces, uri e, and readily decomposable household garbage that are not diluted with water or other fluids and are retained in a compartment in which aerobic corposting will occur 3. The effective volume of the receptacle must be sufficient to accommo ate the number of persons served in the design of the unit installed. The effective v fume of the unit must include sufficient area for the use of composting materials wh ch must not be toxic to the process or hazardous to persons and which must be u ed in sufficient quantity to assure proper decomposition. 4. Residue from the composting toilet must be removed when it is filled o 75 percent of capacity. Residue from the unit must be properly disposed f by methods recommended by the manufacturer and acceptable to the Divi ion. Disposal methods must prevent contamination of water and not cause a public ealth nuisance. Disposal using solid waste practices is recommended. 5. If a system will be installed where low temperature may be a facor, design and installation must address the effects of the low temperature. 6. Composting toilets must be operated according to manufacturer's specifications. G. Portable Chemical Toilets. 1. A portable chemical toilet may be used by permit from the Division. 2. Use of a portable chemical toilet in permanently occupied buildings is pohibited except during construction or under emergency circumstances as determined by the Division. Proper ventilation of a chemical toilet used inside must be required. Sec. 3042-50. Treatment Systems Other Than Those DischarglnThr*u Treatment Area r Sand Filter System. A. For systems discharging to State Waters, see Section 30-2-30.A. oil B. Systems that discharge other than through a soil treatment area or a sand filter system must: 1. Be designed by a professional engineer; 2. Be reviewed by the Board of Public Health; and 3. Not pose a potential health hazard or private or public nuisance or undue risk of contamination 4. Not allow drainage of effluent off of the property of origin. C. The Board of Public Health may choose to permit only systems that do not allow drainage of effluent off the property of origin. D. The following minimum performance criteria must be required for all permitted systems pursuant to this Section: 1. If effluent discharge is made into areas in which the possibility exists for occasional direct human contact with the effluent discharge, the effluent at the point of discharge must meet the minimum treatment criteria of TL3 effluent and specifically adhere to each of the following standards: a. The geometric mean of the E. Coll density must not exceed 15 per 100 milliliters when averaged over any five consecutive samples, and no single sample result for E.coli can exceed 126 per 100 milliliters. b. The arithmetic mean of the standard five-day carbonaceous biochemical oxygen demand (CBOD5) must not exceed ten milligrams per liter when averaged over any three consecutive samples. c. The arithmetic mean of the total suspended solids must not exceed ten milligrams per liter when averaged over any three consecutive samples. 2. If the effluent discharge is made into an area so restricted as to protect against the likelihood of direct human contact with the discharged effluent, the effluent at the point of discharge must meet the treatment criteria of TL2 effluent and specifically adhere to each of the following standards: a. The geometric mean of the E. coli density must not exceed 126 per 100 milliliters when averaged over any five consecutive samples, and no single sample can exceed 325 E. coli per 100 milliliters. b. The arithmetic mean of the standard five-day carbonaceous biochemical oxygen demand (CBOD5) must not exceed 25 milligrams per liter when averaged over any three consecutive samples. c. The arithmetic mean of the total suspended solids must not exceed 30 milligrams per liter when averaged over any three consecutive samples. E. To determine compliance with the standards contained in this Section, the required sampling frequency for E. Coll, CBOD5, and total suspended solid levels must be performed at least once per month when the system is in operation and the results submitted to the Division for compliance with the permit requirements. F. Methods of Analysis — Sampling Points: 1. All effluent samples must be analyzed according to the methods pescribed in the American Public Health Association, American Water Works Associ tion, and Water Environment Federation: Standards Methods for the Examinatio of Water and Wastewater, 21St edition. 2. The sampling point must be a location that is representative of final discharge from the system. ARTICLE XIII OPERATION AND MAINTENANCE Sec. 30-13-10. Responsibility. The owner must be responsible for maintenance of an OWTS unless the responsibility has been contractually assigned to a tenant or a third party or a public, quasi -public, or political subdivision. Sec. 13-13-20. Service Label. For higher level treatment systems or other components under a service cqntract, a clearly visible, permanently attached label or plate giving instructions for obtaining gervice must be placed at a conspicuous location. Sec. 30-13-30. Monitoring and Sampling. A. For an OWTS for which monitoring of effluent is required, a delegated collect and test effluent samples to ensure compliance with the pr Regulation hird party must visions of this B. Sampling may be required by the Division in conjunction with an enforcement action. C. Any owner or occupant of property on which an OWTS is located may req to collect and test an effluent sample from the system. The Division m collection and testing services. The owner or occupant must pay for thes 1 If the Division or a delegated third party collects and tests effluent sa to exceed that which is allowed by the OWTS Act (Title 25, Article 10) for each sample collected and tested. Payment of such charge must permit as a condition for its continued use. est the Division y perform such services. nples, a fee not nay be charged be stated in the 2. Conditions when the Division can require routine monitoring includin , but not limited to: a. Indications of inadequate performance; b. Location in sensitive areas; c. Experimental systems. D. Sampling and analysis must be performed according to American Public Health Association, American Water Works Association, and Water Environment Federation: Standards Methods for the Examination of Water and Wastewater, 21st edition. ARTICLE XIV TECHNOLOGY REVIEW AND ACCEPTANCE Sec. 30-14-10. Technology Review and Acceptance L�y(,a C� A. OWTS technologies must either be public domain, including but not limited to rock and pipe distribution systems, sand filters with pressure distribution and mound systems, with criteria for design, installation, maintenance and use as described in this regulation, or proprietary products that have received Water Quality Control Division review and acceptance before the Division may permit them for use, as stated in Section 43.13 of Regulation 43. B. The Water Quality Control Division must review and provide either comment or acceptance to the manufacturer for proprietary products in these technology categories: 1. Proprietary treatment products (e.g. treatment systems); 2. Proprietary distribution products (e.g. manufactured distribution products or subsurface dripline); 3. Septic tanks; 4. Others as needed. ARTICLE XV MATERIALS INCORPORATED BY REFERENCE Sec. 30-154 0. Materials Incorporated by Reference Throughout these regulations, standards and requirements by outside organizations have been adopted and incorporated by reference. The materials incorporated by reference cited herein include only those versions that were in effect as of April 10, 2017, and not later amendments to the incorporated material. Li) APPENDIX 30-A TEXTURAL TRIANGLE DEFINING TWELVE TEXTURAL CLASSES OF HE USDA (ILLUSTRATED FOR A SAMPLE CONTAINING 37% SAND, 45% SILT, AN Ii 18% CLAY) SOURCE: EPA Design Manual for Onsite Wastewater Treatment and Disp•sal Systems Soil Textural Triangle 0 0 30 sandy clay loam 0 `po `so N'o 0 Sand Separate, % 0 0 lit moo APPENDIX 30-B SOIL CLASSIFICATION SYSTEM (SOIL -SEPARATE SIZE LIMITS) SOURCE: USDA NRCS Field Book (pages 2-45) PINE EARTH ROCK FRAGMENTS 5" 15" 24' 150 380 600 mm _ — charmers i fiagst I stones I boulders Clay Silt Sand Gravel Cob - USDA c fine co. 1 fine � co. v.fi. fi. med. co. � fine medium coarse 'Dies Stones Boulders millimeters: 0.0002 .002 U.S. Standard Sieve No. (opening): mm .02 .05 .1 .25 .5 1 300 140 60 35 18 10 2 mm 5 20 76 4 (3/4) (3) 250 mm 600 mm (10) (25") International Clay Sand Silt fine coarse 1. Gravel Stones millimeters: U.S. Standard Sieve No. .002 mm .02 .20 2 mm 20 mm (opening): 10 (3/4) Unified Silt or Clay Sand Gravel Cobbles Boulders ___ fine r- medium ! co. fine coarse millimeters: U.S. Standard Sieve No. .074 .42 2 mm 4.8 19 76 300 mm (opening): 200 40 10 4 (3/4) (3) Sand Gravel or Stones Broken Rock (angular), AASHTO Clay Silt fine I coarse fine med. I co, or Boulders (rounded) millimeters: .005 mm .074 .42 2 mm 9.5 25 75 mm U.S. Standard Sieve No. (opening): 200 40 10 (3/8) CO (3) phi .#: 12 10 9 8 7 6 5 4 3 2 1 0 -1 -2 3 -4 5 -6 7 5 -9 -10 -12 Modified T..__ i i L !� � ► ►,� w 3 ._.___ Jsafld I bbls e0 1 11r —V clay silt i pe ! I__ !4bb I Ks boulders ►Wentworthilli millimeters: .00025 .002 .004 .008 .016 .031 .062 .125 .25 .5 1 2 4 8 16 32 64 128 256 4092 mm U.S. Standard Sieve No.: 230 120 60 35 18 10 5 APPENDIX 30-C ANNUAL FREE WATER SURFACE EVAPORATION MAP OF WELD COUNTY ADAPTED FROM NOAA TR NWS 33 UNITS: INCHES/YEAR 45 1 40 0 Nunn mBriggsdal e .M.. Windsor Greeley Johnstown r Ft Lupton Erie 40 50 r 45 1 APTER 30 REGUIATI N UPDATE Colorado Department of Public I _ loaltn and Environment has been working on the revisions �o Regulation 43 `OVVTS Regulation) since August of 2015, After 16 stakeholder meetings and two draft documents, the Water Quality Control Commission at their May 8, 2017 meeting officially adopted he updates to Regulation 43. This regulation became effective on June 30, 2017. Su.sequcntly, each local agency must develop and adopt local regulations that are at least as stringent as Regulation 43 within one year from tris date. Those local regulations will then become effective after a public hea(ng and Division review and acceptance. 11' • II I III• I II I IIII, IIII illfill'I 1 II IIII;. III�I,A' u'I '1'• II l: II I''ll 'IIII IpiI II IIII I. I1 I' '' it Il I16 II'I III, Iw•Illou. i pal III SI q,r�NN I •. J I LI II IIIII ,' 'I' Ilia 1 F. F - illl II, IW, a III II, t • '; ill L. I'll II 6•II� l i u••'i' llllIIli 1.. , ' II ill lei � - 1 III ; I dIIIy r • o 'I�r . 1A , , I d '�, J 11 Ir II I'II1 11'1 I� II '. I ',, I•, I w I; I• III - 1111 III! IIII- IA1 ,AI 'IIII ' VIII, - IIII II II '. 1, III 'IaI -Illlr I I r' I h. II I. ,al I n '. II:•( II IIII' I (IIII -'i'� IILI !,' . I,. II III / !IIIIII .Illu 11'111 Ifill! III Illb,g I,I II VIII I II 1 1 II Iii1Il IIII ,1'11111 {I�'III .+ !p�� Iil +;#Cn ' Il,p l It-: I, II, I• IIIIII 'F_ I r# 1 .... l pp tl Jr::tE#6FII:flx u�s4tE Chapter 30 owls Regulations draft changes were made to the minimum standards allowed by CDPHEe No items more stringent than Regulation 43 were added. Orianges in These regulations are "clecn up". These changes are meant to help clarify items and remove arlbiguity from the previous reulations G> r'•. he genera( add O i intend, of the revision is for �e -ess any perceived conflicts w focus O of the tie rem with with accepted iridus Tiodifications that will provide chi the regulation. The goal will be ilatff)ns on wastewater ti `eatmei i v standards 1t, and to co ) ii] am e to align t item PROPOSED ADOPTION SCHEDULE FOR WELD COUNTY OWTS REGULATIONS *UPDATED DATES* October 30, 2017 Worksession Worksession with BCC November 21, 2017 Submitted October 23, 2017 November 17, 2017 November 28, 2017 LING CD BOH Hearing December 18, 2017 January 8, 2017 B January 29, 2018 /B February 12, 2018 A February 18, 2018 I April 5, 2018 - June 30, 2018 CC Hose [ CC Hearing _.: Effective date • need to advertise 20 days sc;_ ,: _. , . _....:r�. .k before this BOH H hearing red to advertise 20 days before this 1st BCC hearing Need to advertise 10 days before this 2nd BCC hearing need to advertise 10 days before this 3rd BCC Staff submits final eocument to state for 45 day review Regulations go into effect. If state has not finished review, the current OWTS regs are in effect until state review is completed. These regulations may be adopted and effective prior to the dates provided on this timeline. This timeline represents the latest dates in order to have adoption and effective Example of requirements for Local Public I lealth Agencies to revise Regulations Section 43.4.A.2 of Regulation 43: 2. Local Regulations a. Local boards of health have one year from the effective date of this regulation to update their local regulations which must be as stringent as this regulation. b. Local boards of health may seek a determination by the Division that their existing local regulations are as stringent as this regulation. c. After one year from the effective date of this regulation, if a local board of health has not finalized regulations pursuant to section 25-10-104(2), C.R.S. and section 4.A.3 of this regulation, the Division will propose local rules based on this regulation to the Commission for approval for use in that county or district. 3. Procedures to Adopt or Revise Regulations by the Local Board of Health: a. A local board of health must submit its proposed regulations to the Division for preliminary review at least 30 days prior to a public hearing before a local board of health. b. The local board of health must hold a public hearing on the proposed regulations before adopting final regulations. c. The local board of health must give notice of the time and place of the public hearing at least once and at least 20 days in advance in a newspaper of general circulation within its area of jurisdiction. d. The local board of health may make changes or revisions to the proposed regulations after the public hearing and prior to final adoption, and no further public hearing is required regarding the changes or revisions. e. All local regulations must be transmitted to the Division no later than five days after final adoption and become effective 45 days after final adoption unless the Division notifies the local board of health before the forty-fifth day that the regulations or any portions of the local regulations determined by the Division are not as stringent as the OWTS Act or with this regulation. Any portions of the local regulations determined by the Division not to be in compliance with the OWTS Act and this regulation will not take effect or be published as regulations of the local board of health. For those portions of its regulations that do not comply, the local board of health may submit revisions to the Division. Only after the Division has determined that the local board of health's revised regulations comply with the OWTS Act and this regulation may the local board of health's revised regulations take effect and be published. Until the Division makes this determination, this regulation controls the unapproved portions of the local regulations. a a r Quality • Control 1 n 4300 Cherry -creek Denver, Colorado D rye South, B2 Engineering Section a PHE. Enc�Fi 80246-1530 iewnacas .s� 1bra eDepanment On -site of Pl:ic. Health antIEmettonment tAia Local st ewater° Regulation Treatment Systems Review Submittal • 303~-692-62';• :, Form A. General Information S ubrn ittaf 2017 Regulation Update p f�� r October 28, 201 7 , Type otSubmittal ?4,,,,Gi' Date: y,5 - �: P orti on •<... 1 t �.,1,n'� < < R �A.aihyZrrt i ntw-`.� .. �/ � Modification k �t'3.b'3 FX�3 `_� y� r k � �FR�� . See Below in Cross Walk 1VIodI��r1%t�.�'. ' Locale Public Health Agency Nam Weld County Department of, Public.. Health and: Environment Submittal Title Chapter. 30. -OWTS Regulations County/Counties Covered Weld Counter B:Local Public Hearth Agency (LPH A) Contact lrforrriatic Main Contact Name Katie Sall Title ENS .III. Address 1555 N. 17th Ave Greeley, CO 80631. Email ksa1la.wel cigov. corn Phone 970-40072216 Fax 970-304-6411 Alternate Contact Name Lauren Light Title EH Program M anager 1555 N:17" Ave Greeley, CO 80631 Email lii htc�Y` ,rweIdcich..c.orn Phone 97 0- 400-221 1 I Fax 970-364-6411 C. Report Submittal Ftequiirerrerrt One hard copy of any submitted material and an electronic copy (PDF). Send P CAF to CI PHE. QEtifi evi einniOstate.co.us CDPHE P H E template used for Regulation Local Regulation Format (Select appropriate Regulation format consistent' vnith Regulation 43 sections. description.) Regulation loll OAS .a different section format. "cross Nate: Ifformat.is different, the -v lk" .must be completed. El (See pages 5-6.) * -Use this area if additional space is needed: esAsedMay, 2017 Local_Regulation ReuieWSubmittal Form Page '1;df'0_ Local Public Health A enc : Weld Count' De$ artmentof Public Health and Enyiro'rtment Decision oaa .. CROSSWALL, :D. Points Sulu ory—Local On -site Wastemeater IretS- eriir:l .eruia ITElvt Options Below are the ALTERNATIVES Select Check Box for Decision Chosen. (Only per item Decisiorns must also be identified either within the local regulation or Appendix A'to the regulation) Citation Reg #43 Citation Local Reg Sail i, as in 2013 Reguation 43 Licensing Systems Contractors 'and Systems Cleaners Neither (Do not .ccense contractors or cleaners) ❑ 43.4.1E Systems Coritractors only are licensed ❑ 434K1 'Systems Cleaners only are licensed O 43.4.x.3 Both cohtracors and cleaner's: are licensed r*i 43.4.x.1 and 3 -30-4-110 a 30-4-120 'Variances Variances .noised raid have a variance ptocedoreprescrabed within the local regulation.) 43.4.N. 30-4-130 ►;4 Variances not allovtied [J 43.4.N Occupancy —Residential Bedrooms -1. through 3: 2 people per bedroom All_additional Bedrooms` 1 person.per bedroom N 43.6:A.2e 30=6-10 3. 8 4. AJI bedrooms: 2 persons per bedroorn ❑ 43.6.A.2.f Ho the number of bedrooms in a home rill be defined -for flow requirements Bedrooms flbw estimatesv;all be: -determined from -the number of bedrooms originally finished Table 30.6-1 Cr If unfinished area-ispresent in house1 OWTS must also be -sized for 1 or 2 more bedrooms based :on an assumption that 150 square feet of unfinished space can be converted into a bedroom, if the space can meet applicable code requirements for a bedroom . ❑ - 43.6.A.2.h Effluent Screen Maybe used (awner's.apt/an) El 43.9.J1 '30-9-100 A. B. Required hall newseptic tanks Q 43.9:4.1 Length of distributiori laterals.(e.g:, . • trenches or beds) 100 feet ma muM length fbr any CWTS system 43.10.E.2.d Inspection ports at.initial '.(front) end of laiteral or chamber 100 feet maximum for gravity. fed from one end, and up to 1-50 feet if pressure dosed or effluent a lied at renter of lateral or chamber Not required a 43.10.E .2.b & c 30-10-40 B. 2. & 3. 3010-60 F.1. Required Q 43.10.F.6.cl Vault Privies —new All ownewvault.privies 43.12.D.1.a 30-12-30 rte, • Prohibit newvault privies ❑ 43.12.0.1.8 Vault Privies.- existirig AJlowcontinued use ofexjsting vault privies Egj 43.1'2.D:1.b 30-12-30 Require abandonment of existing.vaultprivies ■ 43.1201 .b • Revised May, 2017 Local Regulation Revi e*Su bm ittal Form Page 2of6 Local Public Health Agenc : Weld Count. Depart'mento of Public Health and Environment ITEM ALTERNATIVES Select Check D ox for Decision Chosen. Krnlvone selection per itern, Citation Reg #43 Citation Local Reg! Pit Privies - new Allow newpit privies ❑ 43,12,D 2.c Prohibit newpi# privies O d 43.12.D 2.a 3Q-4140 B . Pit Privies - e4sting Atlowcontinued use of era sting pit pi vies ❑ 43.11D 2.c Require abandonment of existing pit privies ($l 4342.0 2,b 30-4140 B. Slit trenches Ailowslit trenches ❑ 43.12.F Prohibit slit trenches Xi 43.12.E 30.414.0 0. Optional Programs/Permits ❑ 43-14.1 2 Reductions (STA) size for higher vwth mandatoryt:maintenance oversight in soil treatment area or separation distances level treatment systems and Allow reductions for higher level treatment.. (To alksw- reductions, local ragalatian most rewire mandatory inspections and maintenance, and kcalpu#Gc health- agency program orinspectiotn. and maintenance overssht most bye in place.) Reductions -in area and separation distances not allovwed forhigher level treaters ent systems.. o. 43.1.4.D 2 30-4-130 D . 7. Transfer of Title inspections , Required-(lf transfer of die k≥ ectians are required., -the craerie that inadequate systemsmostachieve- foowing repair or replacement must be vecified in kicairegokttorr.) ❑ 43.4:L.1 Not required -4 43.4.L.1 Permits forthe Continued Use of an O TS, Define these items on Pg. 4 that are.more stringent than Used -in local regulation (ped pa pase wihui localregalation.) `43.4.M.1 Regulation 43. Not used in local regul• ation & Fir CDPHE Tracking Purposes Require that all Soil Evaluations be submitted'and damped bya licensed professional' engineer All'soil evaluations must be alum fitted by a licensed professional engineer ❑ Or" NIA A licensed pr fessional 'engineer 'C o Technician" may -submit soil e I . •rte - c N/A 30-6-40 B.1 `. Require that all OWTS designs be All OWTS submitted and stamped by a profe si '' licensed professional engi r * `� pia r_.. m ` be , a' b a licensed .. a ne r ❑ NIA .►., e �;o �• wpe an RePulat.,.n quire an engineer's engineer's da ; 43; : en ise�. stamp for sites - ' required by io 43.10.0 NIA Revised May, 201.7 COV en Local Regulation Revi.ewSubmittal Form Pacie 3 of 6 Y t4 fe‘ Re Local Public Health: 4gency Weld: County. Department -.of Public Health. and' Envir:onmeht Summary of items More Stringent than Regulation.43 (TO Be Completed for All Local Regulations Where More Stringent.) yN( mr, rM,Y5Y�,. r{R T'ej/s da Regulation 43 Requitement (e.g .1 sad' on, topic) LeeirReciaternerit (attach additional information as needed) Citation in Local Regulation Please supplerriernt:the-Burnmary of Iterns.f l:ore.Stringetit than Regulation:43 on additivnai sheets as riecessat . Revised May, 2017 Local Regulation Resiewsubmittal Form Page 4 of 6 III II. IIII I:I IP III I III ,Ili III' 11 '11 I iI ' :• III III IIII ... I III q: I I IIII p•' - � I II'� I I � i II",� 'i .. I. ,1 Ills yi it 'll �l; II' n: •. ltl ill III A, l u 'll 01„ UIIII I it �I. 1 P rl,II jlii�,l II ��,, II', I fir; II II j�lil' ill I I 'I'' pall. I III II I I IIII ottable (Thanges Experimental Permit vs. Product Development Pcrmit The experimental section of the regulations is being removed and replaced with a product development permit section. tob The requirements for a product development permit remain the same as an experimental permit with one exception: The product development system must be approved by the Water Quality Control Division before the permit can be applied for with the local puolic health aul-horify. F•r o� Changes, C� S: Two test pits will be required instead of one test pit currently required. Percolation tests may also still e used in addition to the two test pits. If the soil evaluation is different between the two test pits and the percolation test, the more conservative or restrictive sizing must be used for the soil treatment area. Notable Changes, Soil Evaluations continued Layers and interfaces within the test pits as well as consistence must be evaluated in addition to soil typing. Consistence is the evaluation of excavation difficulty, rupture resistance and or penetration resistance of the soil. The test pits must be evaluated before percolation testing LEI Cleanouts A section on cleanouts is being added to the Regulations Previously cleanouts were addressed through the plumbing code only. Cleanouts will be required within 5 feet of the foundation and every 100 feet for sewer line and effluent line. nal sizing riteri f ii with high rack co ent: A table has been added to help with the sizing of soil treatment areas with a high rock content. I u ICI I dill I II �I Ili VIII I I' '1111I VIII il, II J1 IIII 116 III I'll u,I, 1 IIi. I� ' .1 Illr illdlll�� Ni IN IIII,: II II �Ill�il Ihlll Ills l I III qi 1. 1'I�j: III - r1 m Ililll Pressure Distribution, soil replacement, son filers mound systorns: These changes provide clarity and explanation for the installation of these systems. The requirements remain the same but make it easier to interpret and regulate when these systems are proposed or required. I I � I ,JI��I 1111 J I 111. II1'o•IIr J •III. IN'Jill ;,I III IIIiI 111 jtl. to. The link to the proposed Chapter 30 OWTS Regulations Revisions is provided. httpse//www.weldgov.com/departments/health_and_environment/enviro nmental_health/septic systems/ '4//P CHAPTER 30 WELD COUNTY DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT ON -SITE WASTEWATER TREATMENT SYSTEM REGULATIONS TABLE OF CONTENTS ARTICLE I AUTHORITY Sec. 30-1-10. Title Sec. 30-1-20. Jurisdiction, Severability, Savings Clause Sec. 30-1-30. Effective Date ARTICLE II SCOPE AND PURPOSE Sec. 30-2-10. Declaration Sec. 30-2-20. Purpose Sec. 30-2-30. Effluent Discharged to Surface Waters ARTICLE III DEFINITIONS Sec. 30-3-10. Definitions Table 30-3-1 Abbreviations and Acronyms ARTICLE IV ADMINISTRATION AND ENFORCEMENT Sec. 30-4-10. General Sanitation Requirements Sec. 30-4-20. Existing OWTS Review Sec. 30-4-30. Permit Application Requirements and Procedures Sec. 30-4-40. Determination of Compliance of Permit Submission Sec. 30-4-50. Denial of Permit Application Sec. 30-4-60. Access to Site Sec. 30-4-70. Notification and Inspection Stages Sec. 30-4-80. Final Approval of OWTS Permit Sec. 30-4-90. Systems Employing New Technology Sec. 30-4-100. Product Development Permit Sec. 30-4-110. Systems Contractor License Sec. 30-4-120. Regulations of Systems Cleaners Sec. 30-4-130. Variance Procedure Sec. 30-4-140. General Prohibitions Sec. 30-4-150. Prohibition of On -Site Wastewater Treatment Systems in Unsuitable Areas Sec. 30-4-160. Enforcement Sec. 30-4-170. Penalties ARTICLE V SITE AND SOIL EVALUATION Sec. 30-5-10. Site and Soil Evaluation General Requirements Sec. 30-5-20. Preliminary Investigation Sec. 30-5-30. Reconnaissance Sec. 30-5-40. Detailed Soil Investigation Sec. 30-5-50. Marking of Soil Profile Pit Excavations or Percolation Holes Sec. 30-5-60. Report and Site Plan Sec. 30-5-70. Design Document Sec. 30-5-80. Site Protection Sec. 30-5-90. Qualifications for a Competent Technician ARTICLE VI WASTEWATER FLOW AND STRENGTH Sec. 30-6-10. Wastewater Flows Table 30-6-1 Single -Family Residential Design Flows Table 30-6-2 Estimate of Average Daily Wastewater Flow and BOD5 Load Per Person Unless Otherwise Noted Sec. 30-6-20. Wastewater Strength Table 30-6-3 Treatment Levels Table 30-6-4 High Strength Wastewater ARTICLE VII MINIMUM DISTANCES BETWEEN COMPONENTS OF AN ON -SITE WASTEWATER TREATMENT SYSTEM AND PHYSICAL FEATURES Sec. 30-7-10. Minimum Horizontal Distances Sec. 30-7-20. Dry Gulches, Cut Banks and Fill Areas Sec. 30-7-30. On -site Wastewater Treatment System Design Consideration Soil Treatment Area Table 30-7-1 Minimum Horizontal Distances in Feet Between Components of an On -Site Wastewater Treatment System Installed After November 15, 1973 and Water, Physical and Health Impact Features Table 30-7-2 On -site Wastewater Treatment System Design Consideration and Treatment Requirements — Separation Distances from Soil Treatment Area ARTICLE VIII DESIGN CRITERIA -GENERAL Sec. 30-8-10. Performance Sec. 30-8-20. Reliability Sec. 30-8-30. Accessibility for Inspection, Maintenance, and Servicing Sec. 30-8-40. Plumbing Codes Sec. 30-8-50. Electrical Equipment Sec. 30-8-60. Indicators of Failure or Malfunctioning for Systems Utilizing Mechanical Apparatus Sec. 30-8-70. Sampling Access Sec. 30-8-80. Component Operating Instructions Sec. 30-8-90. Surface Activity Sec. 30-8-100. Floodplains Sec. 30-8-110. Business Commercial, Industrial, Institutional or Multi -Family Dwelling Wastewater Systems ARTICLE IX DESIGN CRITERIA -COMPONENTS Sec. 30-9-10. Tanks and Vaults Sec. 30-9-20. Septic Tanks Table 30-9-1 Minimum Septic Tank Size Based on Number of Bedrooms Sec. 30-9-30. Abandonment of Tank Sec. 30-9-40. Pipe Standards and Bedding Requirements Sec. 30-9-50. Cleanouts Sec. 30-9-60. Distribution Box Sec. 30-9-70. Drop Box Sec. 30-9-80. Stepdown/Relief Pipe Sec. 30-9-90. Wastewater Pumping and Dosing Siphon Systems Sec. 30-9-100. Effluent Screens Sec, 30-9-110. Grease Interceptor Tanks ARTICLE X DESIGN CRITERIA -SOIL TREATMENT AREA Sec. 30-10-10. Soil Treatment Area General Sec. 30-10-20. Calculation of Infiltrative Surface of Soil Treatment Area Table 30-10-1 Soil Treatment Area Long-term Acceptance Rates by Soil Texture, Soil Structure, Percolation Rate and Treatment Level Table 30-10-1A Design Criteria for Soils with High Rock Content (Type "R" Soils) 1, 2, 3, 4 Sec. 30-10-30. Allowable Soil Treatment Area Reductions and Increases Table 30-10-2 Size Adjustment Factors for Methods of Application in Soil Treatment Areas Table 30-10-3 Size Adjustment Factors for Types of Distribution Media in Soil Treatment Areas Sec. 30-10-40. Design of Distribution Systems Sec. 30-10-50. Soil Treatment Area Requirements Sec. 30-10-60. Storage/Distribution Media Sec. 30-10-70. Lift Stations Sec. 30-10-30. Soil Replacement Sec. 30-10-90. Repairs ARTICLE XI DESIGN CRITERIA -HIGHER LEVEL TREATMENT SYSTEMS Sec. 30-11-10. General Sec. 30-11-20. Treatment Levels Sec. 30-11-30. Sand Filters Sec. 30-11-40. Mound Systems Sec. 30-11-50. Rock Plant Filter (Constructed Wetland) Treatment Before a Soil Treatment Area ARTICLE XII DESIGN CRITERIA -OTHER FACILITIES Sec. 30-12-10. Evapotranspiration and Evapotranspiration/Absorption Systems Table 30-12-1 Gradation of Wicking Sand for Evapotranspiration Beds Sec. 30-12-20. Vaults other than yault Privies Sec. 30-12-30. Vault Privies Sec. 30-12-40. Incinerating, Composting and Chemical Toilets Sec. 30-12-50. Treatment Systems Other Than Those Discharging Through a Soil Treatment Area or Sand Filter System ARTICLE XIII I OPERATION AND MAINTENANCE Sec. 30-13-10. Responsibility Sec. 13-13-20. Service Label Sec. 30-13-30. Monitoring and Sampling /ARTiCLE X7V TECHNOLOGY REVIEW AND ACCEPTANCE Sec. 30-14-10 Technology Review and Acceptance ARTICE F XV MATERIALS I NCORPORATED BY REFERENCE Sec. 30-15-10 Material Incorporated by Reference Appendix 30-A TEXTURAL TRIANGLE DEFINING TWELVE TEXTURAL CLASSES OF SOIL OF THE USDA Appendix 30-B SOIL CLASSIFICATION SYSTEM (SOIL -SEPARATE SIZE LIMITS) Appendix 30-C ANNUAL FREE WATER SURFACE EVAPORATION MAP OF WELD COUNTY ADAPTED FROM NOAA RR NWS 33 ARTICLE I AUTHORITY Sec. 30-1-10. Title. The Regulations contained herein shall be known as the On -site Wastewater Treatment System Regulations ("Regulations"). Sec. 304-20. Jurisdiction, Severability, Savings Clause. A. These Regulations are promulgated by the Weld County Board of County Commissioners under the authority of the Weld County Home Rule Charter, Section 3-8, acting as the Weld County Board of Public Health under authority of the Weld County Home Rule Charter, and upon the recommendation of the advisory Board of Public Health established pursuant to said Charter. The jurisdiction of these Regulations extends _n a territories within Weld County including all incorporated and unincorporated areas. B. If any section of these Regulations adopted hereunder or its application to any person or circumstance is held invalid, unconstitutional, void or inoperative, such holding shall not affect other provisions or applications of the ordinance adopted hereunder. The Board of Public Health and the Board of County Commissioners hereby declares that in this regard, the rdinance adopted hereunder is severable, and that said Boards would have adopted the remaining ordinance hereof notwithstanding such holding. C. The repeal of any Regulation adopted hereunder shall not deny any right, action, or cause of action, which arose under existing ordinances. D. The repeal and re-enactment of these Regulations shall not prejudice the prosecution of any violations under previous versions of these Regulations. E. The Board of County Commissioners hereby delegates these duties described herein to the Board of Public Health subject to the rights of appeal as outlined in these Regulations. F. Chapter Coverage: These Regulations adopted by the Weld County Board of Public Health, pursuant to current On -site Wastewater Treatment System Regulations of the Colorado Department of Public Health and Environment, Water Quality Control Commission, Regulation #43 (5 CCR 1002-43) and adopted in compliance with Section 25-10-104, C.R.S., shall govern all aspects of permits, performance, location, construction, alteration, installation, and use of Onsite Wastewater Treatment Systems of less than or equal to 2,000 gallons per day design capacity. Site approval, design review and a discharge permit from the Water Quality Control Division are required for a system with design capacity greater than -2,000 gallons per day average flow. Sec. 30®1-30. Effective Date Upon adoption, the On -site Wastewater Treatment System Regulations shall become effective upon the twelfth day of February, 2018. Until the twelfth day of February, 2018, Chapter 30 Code provisions in effect prior to the changes contained in the On -site Wastewater Treatment System Regulations shall remain in effect. ARTICLE II SCOPE AND PURPOSE Sec. 30-2-10. ciarfli no A. In order to preserve the environment and protect the public health and water quality; to eliminate and control causes of disease, infection, and aerosol contamination; and to reduce and control the pollution of the air, land and water, it is declared to be in the public interest to establish minimum standards and regulations for On -site Wastewater Treatment Systems ("OWTS") within the County of Weld and to provide the authority for the administration and enforcement of such minimum standards and regulations. B. This regulation will apply to On -site Wastewater Treatment Systems as defined in Article III of this Chapter -3Q. Sec. 30-2-20. Purpose A. The purpose of this regulation as authorized and required by the OWTS Act, Section 25- 10-101, et seq., C.R.S., is to establish minimum standards for the location, design, construction, performance, installation, alteration and use of OWTS within the County of Weld, including but not limited to permit application requirements; requirements for issuing permits; the inspection, testing, and supervision of installed systems; the maintenance and cleaning of systems; transportation and final disposal of sewage materials; the control of systems contractors and systems cleaners of such systems; and issuance of cease and desist orders. This Regulation meets or exceeds the requirements of the regulations adopted by the Colorado Department of Public Health & Environment, Water Quality Control Commission pursuant to Section 25-10-104, C.R.S. Sec. 30-2- '=a Effluent Discharged to Surface Waters. A. Any system that will discharge into surface waters must be designed by a professional engineer. -The discharge permit application must be submitted for preliminary approval to the Board of Public Health. Once approved by the Board of Public Health, the application must be submitted to the Water Quality Control Division for review in accordance with the Water Quality Control Act, Section 25-8-101, et seq., C.R.S, and all applicable regulations of the Water Quality Control Commission. Compliance with such a permit will be deemed full compliance with this Regulation. ARTICLE III DEFINITIONS Sec. 30-3-10. Definitions. The following definitions shall apply in the interpretation and enforcement of these Regulations. The words "shall," and "must" as used herein indicates a mandatory requirement. "Absorption system" means a leaching field and adjacent soils or other system for the treatment of sewage in an On -site Wastewater Treatment System by means of absorption into the ground. See Soil treatment area. "Accessible": means easily reached, attained or entered by the necessary equipment or maintenance provider. "Applicant" means a person who submits an application for a permit for an On -site Wastewater Treatment System. Basal Area: means the effective surface area available to transmit the treated effluent from the filter media in a mound system into the in -situ receiving soils. The perimeter is measured at the interface of the imported fill material and in -situ soil. On sloping sites, only the area down - gradient from the up -slope edge of the distribution media may be included in this calculation. "Bed" means a below -grade soil treatment area with a level sub -base, consisting of a shallow excavation greater than three feet wide containing distribution media and more than one lateral. "Bedrock" means continuous rock that underlies the soil or is exposed at the surface. Bedrock is generally considered impervious, but if fractured or deteriorated, it may allow effluent to pass through without adequate treatment. "Bedroom" means, a room with an egress window, a closet, and/or is intended for sleeping purposes; or as defined by the local board of health, as stated in the local OWTS regulation. "Biochemical Oxygen Demand, Five -Day" (BOD5)— means quantitative measure of the amount of oxygen consumed by bacteria while stabilizing, digesting, or treating biodegradable organic matter under aerobic conditions over a five-day incubation period; expressed in milligrams per liter (mg/L). "Biochemical Oxygen Demand, Carbonaceous Five Day" (CBOD5) means quantitative measure of the amount of oxygen consumed by bacteria while stabilizing, digesting, or treating the organic matter under aerobic conditions over a five-day incubation period while in the presence of a chemical inhibitor to block nitrification; expressed in milligrams per liter (mg/L). "Board of Public Health" means the Advisory Board of Public Health as designated by the Board of County Commissioners pursuant to the Home Rule Charter. "Building sewer" means piping that conveys wastewater to the first system component or the sewer main. "Carbonaceous Biochemical Oxygen Demand" See Biochemical Oxygen Demand, Carbonaceous. "Cesspool" means an unlined or partially lined underground pit or underground perforated receptacle into which raw household wastewater is discharged and from which the liquid seeps into the surrounding soil. Cesspool does not include a septic tank. "Chamber" means an open, arch -shaped structure providing an open -bottom soil interface with permeable sidewalls used for distribution of effluent in a soil absorption system. "Chapter 30" means Chapter 30 of the Weld County Code also known as the On -site Wastewater Treatment System Regulations. "Cistern" means an underground, enclosed, unpressurized reservoir or tank for storing water as part of a potable water supply system. "Cleaning" means the act of removing septage or other wastes from a wastewater treatment system component or grease/waste from a grease interceptor. "Colorado Plumbing Code" means- Rules and Regulations of the Colorado State Plumbing Board, (3 CCR 720-1). "Competent technician" -means a person who has the appropriate expertise and is able to conduct and interpret the results of soil profile test pit excavations, percolation tests, and site evaluations. This individual has also met the required competencies for a "Competent Technician" as defined in section 30-5-90. "Component" means a subsection of an On -site Wastewater Treatment System; a component may include multiple devices. "Composting toilet" means a self-contained waterless toilet designed to decompose non - water -carried human wastes through microbial action and to store the resulting matter for disposal. "Consistence" means the degree and kind of cohesion and adhesion that soil exhibits and/or the resistance of soil to deformation or rupture under an applied stress to an extent that the soil density would restrict soil permeability. Aspects of consistence are used to determine if the horizon will have permeability lower than that of the defined soil type. Additional insight to consistence can be found in the USDA — NRCS Field book for Describing and Sampling Soils; Version 3.0, Sept. 2012. "Crest" means the highest point on the side of a dry gulch or cut bank. "Cut -bank" means a nearly vertical slope caused by erosion or construction that has exposed historic soil strata. "Deep gravel system" means a soil treatment area for repairs only where the trenches utilize a depth of gravel greater than six (6) inches below the distribution pipe and sidewall area is allowed according to a formula specified in this Regulation. "Deficiency"7 See Malfunction "Department" means the Weld County Department of Public Health and Environment. "Design" means 1) the process of selecting, sizing, locating, specifying, and configuring treatment train components that match site characteristics and facility use as well as creating the associated written documentation; and 2) written documentation of size, location, specification and configuration of a system. "Design capacity" See Flow, Design. "Design flow" See Flow, Design. "Designer, On -site Wastewater Treatment System" means a practitioner who utilizes site evaluation and investigation information to select an appropriate OWTS and prepares a design document in conformance with this Regulation. "Distribution" means the process of conveying wastewater or effluent to one or more components, devices, or throughout a soil treatment area. "Distribution box" means a watertight component that receives effluent from a septic tank or other treatment unit and distributes effluent via gravity in approximately equal portions to two (2) or more distribution laterals in the soil treatment area. "Division" means the Division of Environmental Health Services, Weld County Department of Public Health and Environment. "Division Representative" -See Environmental Health Specialist. "Domestic wastewater" See Wastewater, domestic. "Domestic Wastewater Treatment Works" means a system or facility for treating, neutralizing, stabilizing, or disposing of domestic wastewater which system or facility has a designed capacity to receive more than 2,000 gallons of domestic wastewater per day. The term "domestic wastewater treatment works" also includes appurtenances to such system or facility such as outfall sewers and pumping stations and to equipment related to such appurtenances. The term "domestic wastewater treatment works" does not include industrial wastewater treatment plants or complexes whose primary function is the treatment of industrial wastes, notwithstanding the fact that human wastes generated incidentally to the industrial process are treated therein. Section 25-8-103 (5), C.R.S. "Dosing" means a high rate periodic discharge into a soil treatment area. "Dosing, demand" means configuration in which a specific volume of effluent is delivered to a component based upon patterns of wastewater generation from the source. "Dosing, pressure"- Means a uniform application of wastewater throughout the intended portion of the soil treatment area through small diameter pipes and orifices, under pressure. For this definition, the term pressure indicates that the system is capable of creating upward movement of effluent out of the distribution system piping. "Dosing, timed" means a configuration in which a specific volume of effluent is delivered to a component based upon a prescribed interval, regardless of facility water use. d ve "Dosing siphon" means a device used for demand dosing effluent; which stores a predetermined volume of water and discharges it at a rapid rate, from a tank at a given elevation to a component at a lower elevation, accomplished by means of atmospheric pressure and the suction created by the weight of the liquid in the conveying pipe. "Dosing tank" means a tank, compartment or basin that provides for storage of effluent from a septic tank or other treatment unit intended to be delivered to a soil treatment area at a high rate periodic discharge. "Drainfield" See Soil treatment area. "Drop box" means a device used for serial or sequential distribution of effluent by gravity flow to a lateral of a soil treatment area. "Dry gulch" See Gulch, dry. "Drywell" means an unlined or partially lined underground pit (regardless of geometry) into which drainage from roofs, basement floors, water softeners or other non -wastewater sources is discharged and from which the liquid seeps into the surrounding soil. / "Effective Size" means the size ofgranular media such that tenpercent (10%) by weight g of the media is finer than the size specified. "Effluent" means the liquid flowing out of a component or device of an On -site Wastewater Treatment System. "Effluent filter" See Effluent screen. "Effluent pipe" means non -perforated pipe that conveys effluent from one MI On -site Wastewater Treatment System component to the next. "Effluent screen" means a removable, cleanable (or disposable) device installed on the outlet piping of a septic tank for the purpose of retaining solids larger than a specific size and/or modulating effluent flow rate. An effluent screen may be a component of a pump installation. An effluent screen may also be installed following the septic tank but before higher level treatment components or a soil treatment area. "Environmental Health Specialist" means a person trained in physical, biological, or sanitary science to carry out educational and inspectional duties in the field of environmental health. Also known as Division Representative. "Evapotranspiration/absorption system" means an unlined On -site Wastewater Treatment component that uses evaporation, transpiration, and absorption for dispersal of effluent. "Evapotranspiration system" means an On -site Wastewater Treatment component with a continuous, impermeable liner that uses evapotranspiration and transpiration for dispersal of effluent. ±Ex , ' _ man tal s stem 59 means, a des- - -y-pe of s - em--- a s-ed- pon-i p-ro- sts-oc n -4 n -the to h also -g' y --of se e4r-e s - n--t-hWa-t 'nazi _ not -been f Oast r "Failure" means a condition existing within any component of an OWTS which prevents the system from functioning as intended, and which results in the discharge of untreated or partially treated wastewater onto the ground surface, into surface water or ground water, or which results in the back-up of sewage into the building sewer. Other conditions within an OWTS component that are deemed by a local public health agency to be a threat to public health and/or safety may also be deemed a failure. "Field performance testing" means data gathering on a system in actual use that is being proposed for Water Quality Control Division acceptance. "Floodplain (100 -year)" means an area adjacent to a stream which is subject to flooding as the result of the occurrence of a one hundred (100) year flood, and is so adverse to past, current or foreseeable construction or land use as to constitute a significant hazard to public or environmental health and safety or to property or is designated by the Federal Emergency Management Agency (FEMA) or National Flood Insurance Program (NFIP). In the absence of FEMA/NFIP maps, a professional engineer must certify the flood plain elevations. "Floodway" means the channel of a river or other watercourse and the adjacent land areas that must be reserved in order to discharge the base flood without cumulatively increasing the water surface elevation more than one-half(1/2) foot (six 16.1 inches) at any point or as designated by the Federal Emergency Management Agency or National Flood Insurance Program. In the absence of FEMA/NFIP maps, a professional engineer must certify the floodway elevation and location. "Flow, daily" means the measured volume of wastewater generated from a facility in a 24 -hour period expressed as gallons per day. "Flow, design" means the estimated volume of wastewater per unit of time for which a component or system is designed. Design flow may be given in the estimated volume per unit such as person per unit time that must be multiplied by the maximum number of units that a facility can accommodate over that time. "Flow equalization" means a system configuration that includes sufficient effluent storage capacity to allow for regulated flow on a daily or multi -day basis to a subsequent component despite variable flow from the source. "Flow equalizer" means an adjustment device to evenly distribute flow between outlets in a distribution box or other device that may be out of level. "Grease interceptor tank" means a watertight device located outside a facility designed to intercept, congeal, and retain or remove fats, oils, and grease from sources such as commercial food -service that will generate high levels of fats, oils and greases. "Ground water" means that part of the subsurface water that is at or below the saturated zone. "Ground water surface" means the uppermost limit of an unconfined aquifer at atmospheric pressure. "Guidelines" means State Board of Health Guidelines on Individual Sewage Disposal Systems, 5 CCR 1003-6, which are the predecessor of Regulation 43, On -site Wastewater Treatment System Regulations, 5 CCR 1002-43. "Gulch, dry" means a deep, narrow ravine marking the course of an intermittent or ephemeral stream. "Health Officer" means the Director of the Weld County Department of Public Health and Environment, or other representative as designated by the Board of County Commissioners of Weld County. "Higher level treatment" means designated treatment levels other than treatment level 1.(See table 30-6-3) "Holding tank": See "vault" "Individual Sewage Disposal System" means a term used for On -site Wastewater Treatment System in Color do Regulations from 1973 until 2013. "Infiltrative surface" means designated interface where effluent moves from distribution media or a distribution product into treatment media or original soil. In standard trench or bed systems this will be the interface of the distribution media or product and in -situ soil. Two separate infiltrative surfaces will exist in a mound system and an unlined sand filter; one at the interface of the distribution media and fill sand, the other at the interface of the fill sand and in -situ soil. "Inspection port" means an access point in a system component that enables inspection, operation and/or maintenance. "Invert" means elevation of the bottom of the inside pipe wall or fitting. "Lateral" means a pipe, chamber or other conveyance used to carry and distribute effluent. "Leach field" See Soil treatment area. "Lift Station" means a device used for the vertical lifting of sewage or effluent to the required horizontal level of either the septic tank or soil treatment area. "Limiting layer" means a horizon or condition in the soil profile or underlying strata that limits the treatment capability of the soil or severely restricts the movement of fluids. This may include soils with low or high permeability, impervious or fractured bedrock, or a seasonal or current ground water surface. Lunear Loads i Rate: means the amount of effluent applied per lit (g-pd/linear fn er foot along the contour "Liner" means an impermeable synthetic or natural material used to prevent or restrict infiltration and/or exfiltration. For the purposes of this regulation, the minimum thickness of a liner must be 30 ml. `"e:1x:14-1Ja F "Long -Term Acceptance Rate" (LTAR) means a design parameter expressing the rate that effluent enters the infiltrative surface of the soil treatment area at equilibrium, measured in volume per area per time, e.g. gallons per square foot per day (gal/ ft2/day). "Malfunction" means the condition in which a component is not performing as designed or installed and is in need of repair in order to function as originally intended._ "Manufactured media"— See Media, other manufactured. "Media" means solid material that can be described by shape, dimensions, surface area, void space, and application. "Media, Enhanced Manufactured" means an accepted proprietary manufactured distribution product, other than a chamber, wrapped in a specified fabric, and placed on a specified sand base or media that does not mask the infiltrative surface of the in -situ soil. "Media, other manufactured" means an accepted proprietary manufactured distribution product made of synthetic media for distribution of effluent that is placed directly on the in -situ soil. "Media, treatment" means non -or slowly -degradable media used for physical, chemical, and/or biological treatment in an On -site Wastewater Treatment System component. "Mound" means a soil treatment area whereby the infiltrative surface is at or above original grade at any point "Nitrogen reduction" means a minimum 50 percent reduction of influent nitrogen strength which is the minimum objective of NSF/ANSI Standard 245 - Wastewater Treatment Systems - Nitrogen Reduction. "On -Site Wastewater Treatment System" or "OWTS" and, where the context so indicates, the term "system" means an absorption system of any size or flow or a system or facility for treating, neutralizing, stabilizing, or dispersing sewage generated in the vicinity, which system is not a part of or connected to a sewage treatment works. "Owner" means the person who is owner of record of the land on which an On -site Wastewater Treatment System is to be designed, constructed, installed, altered, or used. "OWTS Act" means the On -site Wastewater Treatment System Act, Section 25-10-101, et seq. C.R.S. "Percolation test" means a subsurface soil test at the depth of a proposed absorption system or similar component of an OWTS to determine the water absorption capability of the soil, the results of which are normally expressed as the rate at which one inch of water is absorbed. The rate is expressed in minutes per inch. "Performance standard" means minimum performance criteria for water quality and operation and maintenance established by the regulatory authority to ensure compliance with the public health and environmental goals of the state or the Division. "Permeability" means the property of a material which permits movement of water through the material. "Permit" means a permit, issued by the Division, authorizing the construction or alteration, installation, and use or for the repair of an On -site Wastewater Treatment System. "Person" means an individual, partnership, firm, corporation, association, or other legal entity and also the state, any political subdivision thereof, or other governmental entity. "Pressure distribution"- See "Dosing, pressure" "Privy" means an above grade structure allowing for the disposal of excreta not transported by a sewer and which provides privacy and shelter and prevents access to the excreta by flies, rodents, or other vectors. 1. Pit privy — privy over an unlined excavation. 2. Vault privy — privy over a vault. "Professional engineer" means an engineer licensed in accordance with Section 12-25-101, et seq., C.R.S. "Professional geologist" means a person who is a graduate of an institution of higher education which is accredited by a regional or national accrediting agency, with a minimum of thirty semester (forty-five quarter) hours of undergraduate or graduate work in a field of geology and whose post - baccalaureate training has been in the field of geology with a specific record of an additional five years of geological experience to include no more than two years of graduate work. Section 23- 41-208, C.R.S., and Section 34-1-201, C.R.S. "Proprietary product" means a manufactured component or other product that is produced by a private person. It may be protected by patent, trademark or copyright. "Public domain technology" means a system that is assembled on location from readily available components and is based on well -established design criteria and is not protected by patent, trademark or copyright. "Record Drawing'": means construction drawings provided to illustrate the progress or completion of the installation of an OWTS, or components of the OWTS; typically based on field inspections by the designer or local public health agency. "Redoximorphic" means a soil property that results from the reduction and oxidation of iron and manganese compounds in the soil after saturation with water and subsequent desaturation. "Remediation system" means a treatment system, chemical/biological additive or physical process that is proposed to restore the soil treatment area of an OWTS to intended performance. "Repair" means restoration of functionality and/or treatment by reconstruction, relocation, or replacement of an on -site sewage wastewater treatment system or any component thereof in order to allow the system to function as intended. "Replacement System"; See "Repair" "Riser" means a watertight vertical cylinder and lid allowing access to an OWTS component for inspection, cleaning, maintenance, or sampling. "Rock -plant filter" means a designed system which utilizes treatment media and various wetland plants to provide treatment of wastewater through biological, physical, and chemical processes. Also called a constructed wetland. "Sand filter" means an engineered designed OWTS that utilizes a layer of specified sand as filter and treatment media and incorporates pressure distribution. "Sand filter, lined" means an engineered designed OWTS that has an impervious liner and under -drain below the specified sand media. Lined sand filters may be intermittent / single pass where the effluent is distributed over the sand bed a single time before distribution to a soil treatment area, or recirculating where part of the effluent is returned to an earlier component for additional treatment before distribution to a soil treatment area. "Sand filter, unlined" means an engineered designed OWTS that includes a layer of specified sand used as a treatment media without a liner between the sand and the existing soil on which it is placed. "Seepage pit" means an excavation deeper than it is wide that receives septic tank effluent and from which the effluent seeps from a structural internal void into the surrounding soil through the bottom and openings in the side of the pit. "Septage" means a liquid or semisolid that includes normal household wastes, human excreta, and animal or vegetable matter in suspension or solution generated from a residential septic tank system. -Septage may include such material issued from a commercial establishment if the commercial establishment can demonstrate to the Division that the material meets the definition of septage set forth in the preceding sentence. "Septic tank" means a watertight, accessible, covered receptacle designed and constructed to receive sewage from a building sewer, settle solids from the liquid, digest organic matter, store digested solids through a period of retention, and allow the clarified liquids to discharge to other treatment units for final disposal. "Sequential distribution" means a distribution method in which effluent is loaded into one (1) trench and fills it to a predetermined level before passing through a relief pipe or device to the succeeding trench. The effluent does not pass through the distribution media before it enters succeeding trenches. "Serial distribution" means a distribution method in which effluent is loaded into one (1) trench and fills it to a predetermined level before passing through a relief pipe or device to the succeeding trench. The effluent passes through the distribution media before entering succeeding trenches which may be connected to provide a single uninterrupted flow path. "Sewage" means a combination of liquid wastes that may include chemicals, house wastes, human excreta, animal or vegetable matter in suspension or solution, and other solids in suspension or solution, and that is discharged from a dwelling, building, or other establishment. See also Wastewater. "Sewage treatment works" has the same meaning as "domestic wastewater treatment works" under Section 25-8-103, C.R.S. "Site evaluation" means a comprehensive analysis of soil and site conditions for an OWTS. "Site evaluator" means a practitioner who conducts preconstruction site evaluations, including visiting a site and performing soil analysis, a site survey, or other activities necessary to determine the suitability of a site for an OWTS. "Slit trench latrine" means a temporary shallow trench for use as disposal of non -water -carried human waste. "Soil" means 1. unconsolidated mineral and/or organic material on the immediate surface of the earth that serves as a medium for the growth of plants and can potentially treat wastewater effluent; 2. unconsolidated mineral or organic matter on the surface of the earth that has been subjected to and shows effects of: a) pedogenic and environmental factors of climate (including water and temperature effects) and b) macro and microorganisms, conditioned by relief, acting on parent material over a period of time. "Soil evaluation" means a percolation test, soil profile, or other subsurface soil analysis at the depth of a proposed soil treatment area or similar component or system to determine the water absorption capability of the soil, the results of which are normally expressed as the rate at which one inch of water is absorbed or as an application rate of gallons per square foot per day. "Soil horizon" means layers in the soil column differentiated by changes in texture, color, redoximorphic features, bedrock, structure, consistence, and any other characteristic that affects water movement or treatment of effluent. "Soil morphology" means 1) physical constitution of a soil profile as exhibited by the kinds, thickness, and arrangement of the horizons in the profile; and by the texture, structure, consistence, and porosity of each horizon; and 2) visible characteristics of the soil or any of its parts. "Soil profile test pit excavation" means a trench or other excavation used for access to evaluate the soil horizons for properties influencing effluent movement, bedrock, evidence of seasonal high ground water, and other information to be used in locating and designing an On - site Wastewater Treatment System. "Soil structure" means the naturally occurring combination or arrangement of primary soil particles into secondary units or peds; secondary units are characterized on the basis of shape, size class, and grade (degree of distinctness). "Soil texture" means proportion by weight of sand, silt, and clay in a soil. "Soil treatment area" means the physical location where final treatment and dispersal of effluent occurs. Soil treatment area includes drainfields, mounds and drip fields. "Soil treatment area, alternating" means final treatment and distribution component that is composed of two soil treatment areas that are independently dosed. "Soil treatment area, sequencing" means a soil treatment area having more than two sections that are dosed on a frequent rotating basis. "State Waters" means any and all surface and subsurface waters which are contained in or flow in or through this state, but does not include waters in sewage systems waters in treatment works of disposal systems, waters in potable water distribution systems, and all water withdrawn for use until use and treatment have been completed. Section 25-8-103 (19) C.R.S. "Strength, wastewater" means the concentration of constituents of wastewater or effluent; usually expressed in mg/L. "Suitable soil" means a soil which will effectively treat and filter effluent by removal of organisms and suspended solids which meets long-term acceptance rate requirements as defined in Table 30-10-1, and has the required vertical thickness below the infiltrative surface and above a limiting layer." "Systems cleaner" means a person engaged in and who holds himself or herself out as a specialist in the cleaning and pumping of On -site Wastewater Treatment Systems and removal of the residues deposited in the operation thereof. "Systems contractor" means a person engaged in and who holds himself or herself out as a specialist in the installation, renovation, and repair of On -site Wastewater Treatment Systems. "Total suspended solids" means measure of all suspended solids in a liquid; typically expressed in mg/L. "Transfer of Title" means change of ownership of a property. "Treatment level" means defined concentrations of pollutants to be achieved by a component or series of components of an OWTS. "Treatment media" See Media, treatment. "Treatment unit" means a component or series of components where solids or pollutants are removed from wastewater or effluent from a preceding component. "Trench" means 1) below -grade soil treatment area consisting of a shallow excavation with a width of 3 feet or less containing distribution media and one lateral; and 2) excavation for placement of piping or installation of electrical wire or conduit. "Uniformity coefficient" means a value which is the ratio of D60 to D10 where D60 is the soil diameter of which 60 percent of the soil weight is finer and D10 is the corresponding value at 10 percent finer. (A soil having a uniformity coefficient smaller than 4 would be considered "uniform" for purposes of this Regulation.) "Vault" means a watertight, covered receptacle, which is designed to receive and store excreta or wastes either from a building sewer or from a privy and is accessible for the periodic removal of its contents. If the vault is intended to serve a structure or structures that are projected to generate a domestic wastewater flow of two thousand gallons per day or more at full occupancy, the vault is a domestic wastewater treatment works. Vaults are On -site Wastewater Treatment Systems. "Visual and tactile evaluation of soil" means determining the properties of soil by standardized tests of appearance and manipulation in the hand. "Volume, effective" means the amount of effluent contained in a tank under normal operating conditions; for a septic tank, effective volume is determined relative to the invert of the outlet. For a dosing tank, the effective volume under normal conditions is determined relative to the invert of the inlet and the control off level. "Wastewater, domestic" means combination of liquid wastes (sewage) which may include chemicals, household wastes, human excreta, animal or vegetable matter in suspension or solution, or other solids in suspension or solution which are discharged from a dwelling, building or other structure. "Wastewater, high strength" means 1. Wastewater from a structure having BOD5 greater than 300 mg/L; and/or TSS greater than 200 mg/L; and/or fats, oils, and grease greater than 50 mg/L; or 2. Eeffluent from a septic tank or other pretreatment component (as defined by NSF/ANSI Standard 40 testing protocol) that has BOD5 greater than 180 mg/L; and/or TSS greater than 80 mg/L; and/or fats, oils, and grease greater than 25 mg/L and is applied to an infiltrative surface. "Wastewater pond" means a designed pond which receives exclusively domestic wastewater from a septic tank and which provides an additional degree of treatment. "Water Quality Control Commission" State of Colorado Commission created by Section 25-8- 201, C.R.S. "Water Quality Control Division" means the division of the Colorado Department of Public Health and Environment. "Wetland, constructed" See Rock -plant filter. "Wetlands" means those areas that are inundated or saturated by surface or groundwater at a frequency and duration sufficient to support, and that under normal circumstances do support, a prevalence of vegetation typically adapted for life in saturated soil conditions. Wetlands generally include swamps, marshes, bogs and similar areas. Table 30-3-1 Abbreviations and Acronyms AASHTO American Association of State Highway and Transportation fficials ANSI American National Standards Institute ASTM American Society for Testing and Materials BOD Biochemical Oxygen Demand C.R.S. Colorado Revised Statutes CBOD Carbonaceous Biochemical Oxygen Demand CSA gpd Canadian Standards Association gallons per day IAPMO International Association of Plumbing and Mechanical Officials ISDS Individual Sewage Disposal System LTAR mg/L Long-term Acceptance Rate milligrams per Liter MPI Minutes Per Inch NAWT National Association of Wastewater Technicians NDDS Non -pressurized Drip Dispersal System NPCA National Precast Concrete Association NSF National Sanitation Foundation OWTS On -site Wastewater Treatment System(s) STA TL TN Soil Treatment Area Treatment Level Total Nitrogen TSS UL Total Suspended Solids Underwriters' Laboratories ARTICLE IV ADMINISTRATION AND ENFORCEMENT Sec. 30-4-10. General Sanitation Requirements. A. The owner of any structure where people live, work, or congregate shall ensure that the structure contains an adequate, convenient, sanitary toilet and sewage system in good working order. Under no condition shall sewage or effluent be permitted to be discharged upon the surface of the ground, or into State Waters, unless the sewage or effluent meets the minimum requirements of these Regulations or the water quality standards of the Colorado Water Quality Control Commission, whichever are applicable. Any person who is aware of a malfunctioning OWTS is encouraged to report the location of the system to the Division. Sec. 30-4-20. Existing OWTS Review. A. In the case of an existing OWTS, which was installed and exists without a permit, certain circumstances, including but not limited to, a referral from the Department of Planning Services, may require evaluation to assure compliance with these Regulations. The owner of the property shall certify in written form the size of the tank in gallons and the absorption field in square feet, and provide a drawing showing the location and dimensions of the existing OWTS, as it exists at the time of review. B. The owner shall provide a pumping receipt from a Weld County licensed systems cleaner, a tank inspection report for evaluation of existing systems for loan approval inspections and any other inspections deemed necessary by the Division. The tank must have been inspected and pumped within the last two (2) years of the existing system evaluation request. Sec. 30-4-30. Permit Application Requirements and Procedures. A. Prior to installing, altering, or repairing a system, the applicant must obtain a permit from the Division. B. An applicant must submit a complete application that is consistent with Section 30-4-40. to the Division prior to installing, altering or repairing a system. C. Minimum Permit Application Requirements: 1. Owner name and contact information; 2. Applicant's name and contact information; 3. Property address; 4. Parcel Identification Number; 5. Property legal description; 6. Type of permit; 7. Lot size, in acres; 8. Type of building use; 9. Type of water supply; 10. The owner's signature or agent with written permission to sign for the owner; 11. Directions to the property; 12. Report from Site and Soil Evaluation (see ARTICLE V); 13. System design with a legible, accurate site plan which shows pertinent physical features on subject property, and on adjacent properties, as noted in Table 30-7-1; and 14. Other information, data, plans, specifications and tests as required by the Division, including, but not limited to: a. Additional Evaluation: When the Division Representative has determined that the Division does not have sufficient information for evaluation of an application or a system, the Division Representative may require additional tests or documentation. b. Additional Hydrological, Geological or Engineering: When specific evidence suggests undesirable soil conditions exist, additional hydrological, geological, engineering or other information provided by a professional engineer or geologist may be required to be submitted by the applicant. This requirement will not prejudice the right of the Division to develop its own information from its own source(s). c. Any expenses associated with additional information, data, plans, specifications and tests shall be the responsibility of the party obtaining the permit. D. After receiving an application for an OVVTS permit, the application shall be reviewed by the Division and an inspection shall be made by the Environmental Health Specialist consisting of: 1. Inspection of the premises, unless previously inspected; 2. An assessment of the general topographical conditions; 3. A preliminary assessment as to the suitability of the site and of the proposed system design based upon verification of the ground water table, suitable soil, depth to bedrock, ground slope and pertinent physical features such as the location of the OWTS with reference to wells, streams, lakes, ditches, structures, and other geographical features; E. Permit Fees 1. A permit fee, as set by the Board of Weld County Commissioners, shall be required of applicants for the installation, alteration or repair of an OWTS, payable at the time the application is received. Permit fees are non-refundable except as specifically provided in E.3. of this Section. Permit applications are non -transferable. The issuance of a permit does not denote approval of any zoning subdivision or building code requirements. 2. The Weld County Board of Public Health and/or the Division, may make provision for the waiver of any permit fee normally required for an OWTS. 3. Fee Refunds: a. The Division may authorize the refunding of any fee paid which was erroneously paid or collected. b. The Division shall not authorize the refunding of any fee paid except upon written request filed by the original permittee. F. Other Fees 1. Re -Inspection Fee - The Division may assess a re -inspection fee as established by the Board of County Commissioners for each inspection or re -inspection when such portion of work for which inspection is called is not complete or when corrections called for are not ready. 2. Surcharge - The Division must collect a fee of twenty-three dollars ($23.00) for each permit issued for a new, repaired, or upgraded OWTS. Of that fee, the Division must retain three dollars ($3.00) to cover the -Division's administrative costs and twenty dollars ($20.00) must be transmitted to the state treasurer, who must deposit that sum in the water quality control fund created in Section 25-8-502(1)(c), C.R.S G. Permit Term. 1. If both a building permit and an OWTS permitare issued for the same property, and construction is not commenced prior to the expiration date of the building permit, the OVVTS permit shall expire at the same time as the building permit. If an OWTS permit is issued for property on which no building permit is required, the OWTS permit shall expire one year after the permit's issuance, if construction is not commenced. 2. Any change in plans or specifications after the permit has been issued invalidates the permit unless written approval is secured from the Division Representative for such changes. Expired permits can only be renewed by payment of the permit fee and only if there has been no change in the plans and specifications of the proposed system as set out in the original application; or such change is reviewed and approved by a Division Representative. H. Repair Permit 1. The Division may issue a repair permit and an emergency use permit to the owner or occupant of property on which a system is not functioning properly. Application for a repair permit shall be made by such owner or occupant to the Division within two business days after receiving notice that the system is not functioning in compliance with the OVVTS Act, or applicable sections of these Regulations adopted thereunder, or otherwise constitutes a nuisance or a hazard to public health. 2. The permit shall provide for a reasonable period of time within which repairs shall be made. At the end of that period the system shall be inspected by this Division to ensure it is functioning properly. Concurrently with the issuance of a repair permit, the Division may issue an emergency use permit authorizing continued use of a malfunctioning system on an emergency basis for a period not to exceed the period stated in the repair permit. Such an emergency use permit may be extended, for good cause shown, in the event repairs may not be completed in the period stated in the repair permit through no fault of the owner or occupant and only if the owner or occupant will continue to make repairs to the system. I. A permit must be required for the expanded use of an OWTS. The OWTS must be replaced or modified to handle the increased design flow unless it is determined that the existing system is adequately designed and constructed for the higher design flow rate. J. The issuance of a permit and specifications of terms and conditions therein will not constitute assumption of liability, nor create a presumption that Weld County or its officers, employees or agents may be liable for the failure or malfunctioning of any system. Permit issuance will not constitute a certification that the system, the equipment used in the system, or any component used for system operation will ensure continuous compliance with the provision of the OWTS Act, applicable sections of these Regulations adopted thereunder, or any terms and conditions of a permit. K. No OWTS permit shall be issued to any person when the subject property is located within a municipality or special district that provides public sewer service, except where such sewer service to the property is not feasible in the determination of the municipality or special district, or the permit is otherwise authorized by the municipality or special district. Sec. 30-4-40. Determination of Compliance of Permit Submission. A. A determination shall be made by an Environmental Health Specialist after review of the application, site and soils evaluations, assumptions and calculations, design of the proposed OWTS test results, and other required information, whether the proposed system is in compliance with the requirements of these Regulations and the OWTS Act and any other applicable rules and regulations adopted thereunder. A permit may be issued by the Division Representative if the proposed system is determined to be in compliance with the requirements of these Regulations and the OWTS Act and any other applicable rules and regulations adopted thereunder. B. After reviewing all required information, the Division may give conditional approval for a permit for the proposed OWTS, or it may recommend disapproval of the application and denial of the permit if the proposed system cannot be made to comply with these Regulations and the OWTS Act and any other applicable rules and regulations adopted thereunder. Written notice of the denial of a permit or disapproval of plans shall be served upon the applicant as provided by the Colorado Rules of Civil Procedure or by certified mail, return receipt requested. Service by mail shall be complete upon receipt by the Division of the return receipt. Any applicant whose permit application has been denied may request review of the application by the Board of Public Health as provided in Section 30-4-50. The conditional approval shall set forth conditions precedent to the issuance of a permit including effluent testing, cleaning or maintenance schedules, or other special conditions. No permit shall be issued to the applicant or to a subsequent owner until the conditions have been met. C. No permits shall be issued for the following systems unless they are designed by a professional engineer, and until they have been reviewed and approved by the Board of Public Health: 1. Product Development Permits; 2. Treatment systems other than those discharging through a soil treatment area or a sand filter system. Sec. 30-4-50. Denial of Permit Application. A. Any applicant whose permit application has been denied by the Division may request review of the application by the Board of Public Health. B. A request for review shall be made within sixty (60) days after denial. C. The applicant shall bear the burden of supplying the Board of Public Health with sufficient evidence to document that the denied system will be constructed and used in such a manner as to comply with the declaration and intent of these Regulations and all applicable state and local rules and regulations and required terms and conditions in any permit pursuant thereto. D. Should the Board of Public Health deny an appeal under this Section 30-4-50, the applicant shall have the right to appeal such decision to the Weld County Board of County Commissioners pursuant to Section 3-8(4)(n) of the Weld County Home Rule Charter and the procedures promulgated thereunder. Sec. 30-4-60. Access to Site. For the purpose of inspecting and enforcing applicable regulations and the terms and conditions of any permit issued and investigating and responding to complaints, the Division is authorized to enter upon private property at reasonable times and upon reasonable notice for the purpose of determining whether or not an operating OWTS is functioning in compliance with the OWTS Act and applicable regulations adopted pursuant thereto and the terms and conditions of any permit issued and to inspect and conduct tests in evaluating any permit application. The owner or occupant of every property having an OWTS must permit the access to the property to make inspections, conduct required tests, take samples, and monitor compliance. If access is denied, the Division Representative may apply to the District Court for an order authorizing entry. Sec. 30-4-70. Notification and Inspection Stages. A. When construction of an OWTS has been completed, the system contractor or owner shall notify the Division, and a representative of the Division shall make a final inspection within seventy-two (72) hours, or at an agreed time, after receipt of notice, Saturdays, Sundays, and holidays excepted. B. If upon final inspection of the system, the Environmental Health Specialist finds the system installed in accordance with these Regulations and the permit, the Environmental Health Specialist shall issue final approval for the completed system. If the system was required to be designed by or constructed under the supervision of a professional engineer, the Division shall require the engineer to certify, in writing, to the Division that construction and installation of the system has been completed in accordance with the terms of the permit and these Regulations. If the inspection discloses any significant departure from the description or design of the system as stated in the application and permit, or if any aspect of the system fails to comply with these Regulations, approval shall be withheld. Written notice of deficiencies causing the disapproval shall be given to the system contractor or owner. A subsequent inspection shall be made upon notification from the system contractor or owner that the deficiencies have been corrected and the system has been brought into compliance with these Regulations. Sec. 30-4-80. Final Approval of OWTS Permit. A. Final approval of the OWTS permit by the Division must include, but is not limited to: 1. Receipt of letter from the professional engineer certifying construction of the OWTS as per the approved design, if the OWTS was engineer -designed; 2. Receipt of a record drawing which includes a scale drawing showing all components of the OWTS, including their location from known and findable points, dimensions, depths, sizes, manufacturers' names and models as available, and other information relative to locating and maintaining the OWTS components. 3. Final inspection prior to backfilling the OWTS by the Division confirming that it was installed according to the permit requirements and regulations or variances to the regulations; and Identification of systems contractor. Sec. 30-4-90. Systems Employing New Technology. Systems employing new technology may be considered by the Division provided they have been reviewed and accepted by the Water Quality Control Division according to Section 43.13 of On -site Wastewater Treatment System Regulation #43, as adopted in 2017. The Division prohibits the reduction of system size, or the reduction in vertical or horizontal separation when higher level treatment systems are used. Sec. 30-4-100. Product Development Permit 1 A. For products that have not received Colorado Water Quality Control Division acceptance, the manufacturer may apply to the local public health agency for a product development permit. Requirements for proprietary treatment component acceptance are in Regulation 43-5 CCR 1002-43. The. Division prohibits the reduction of system size, or the reduction in vertical or horizontal separation when higher level treatment systems are used. B. For products or types of systems which have not been otherwise accepted by the Colorado Water Quality Control Division pursuant to section 43.13.D of Regulation 43, the Board of Public Health may approve an application for product development permit only if the system has been designed by a professional engineer, and only if the application provides proof of the ability to install a replacement OWTS in compliance with all local requirements in a timely manner in the event of a failure or malfunction of the system installed. C. Before a product development permit is issued, the Water Quality Control Division must determine that the product to be tested qualifies for testing under the product development evaluation based on information submitted to the Division. 1. Applicant must provide evidence of nationally accepted third -party testing of the product to be evaluated, or 2. Provide test data from multiple single-family homes under normal working conditions that meet the following criteria: a. Test data must be provided from a minimum of four sites. b. Each system must be tested over a period of at least one year. c. Each system must be sampled at least three times during the year with at least one sample obtained during cold weather conditions. d. Laboratory results for all parameters for which acceptance is being requested must be submitted. D. The board of health must not arbitrarily deny any person the right to consideration of an application for such a system and must apply reasonable performance standards in determining whether to approve such an application; 25-10-108 (2), C.R.S. E. A completed application for a product development permit must be submitted to the Division at least 30 days in advance of installation of the product. F. An application for a product development permit must include the following: 1. Proof of the ability to install a replacement OWTS in compliance with all local requirements in a timely manner in the event of a failure or malfunction of the system under testing; 2. A description of the product under development including performance goals; and 3. Documentation signed by the owner of the proposed product development site allowing access to the local public health agency and Division for inspection of the site. 4. Design documents as required in section 30-5-70 of this regulation. G. Other than the performance standards identified in section 30-4-100 C. 2 above, the division may stipulate additional requirements for the product development permit necessary to ensure that the system performs as intended. H. A product development permit is a site -specific permit. Product development testing at multiple sites requires a product development permit for each site. I. During the term of the product development permit, all data collected is to be submitted to the Water Quality Control Division and the Division. J. The Division may revoke or amend a product development permit, if the continued operation or presence of the product under development: 1. Presents a risk to the public health or environment; 2. Causes adverse effects on the proper function of the OWTS on the site; 3. Leaks or discharges effluent on the surface of the ground; or 4. If the developer of the product fails to comply with any requirements stipulated on the permit by the Division or the Water Quality Control Division. K If the product development permit is revoked, the product developer must install the replacement system. L. Once the system is installed and approved, the Division must supply the Water Quality Control Division with a copy of the completed OWTS permit. M The Division prohibits the reduction of system size, or the reduction in vertical or horizontal separation when higher level treatment systems are used. Sec. 30-4-110. Systems Contractor License. No person, except as in Section 30-4-110.B below, shall install, engage in the installation of, or repair an OWTS unless such personhe holds a valid systems contractor license issued by the Division. Employees of a validly licensed Systems Contractor shall not be required to be licensed. The initial fee for a systems contractor license shall be set by separate Chapter of the Board of Weld County Commissioners. A license shall expire on December 31 of each year, and shall be renewed within thirty (30) days prior thereto, and an annual renewal fee, as set by separate Chapter of the Board of Weld County Commissioners, shall be charged. A license which lapses because of failure to renew or is revoked shall be subject to the fee established for a new license upon re -application. B. Any owner of record shall be entitled to install one OWTS per year for his own private use under the terms and conditions of the permit. A system contractor license shall not be required for owner -installers who have obtained permits in accordance with these regulations. However, owner -installers shall be responsible for complying with all other applicable requirements of these regulations, including but not limited to, assuring that all required inspections are scheduled with, and performed by the Division Representative. C. Standard of performance required for holders of system contractor licenses. 1. Application for systems contractors licenses or renewals shall be made upon forms supplied by the Division. 2. Prior to the issuance or renewal of a license, the Division Representative may require the applicant to demonstrate adequate knowledge of these Regulations. 3. Installation, renovation or repair of any OWTS shall be in compliance with these Regulations and with the conditions set out in the installation permit. 4. Notice of a requested inspection shall be given by the license holder not less than twenty-four (24) hours before the inspection is to be made. 5. The license holder shall ensure that a permit has been issued before installation of a system has begun. D. Revocation of License. 1. A license may be revoked for failure to comply with these Regulations or for other good cause shown above. Revocation shall take place only after a hearing before the Board of Public Health. The license holder shall be given not less than ten (10) days notice of the hearing and may be represented at the hearing by counsel. 2. Written notice of revocation explaining the violations shall be served upon the holder of the systems contractor license. Service of notice as required in this Section shall be as provided by the Colorado Rules of Civil Procedure, or by registered or certified mail, return receipt requested, deliverable to the addressee only. 3. A person who has previously had a systems contractor license revoked may be denied issuance of a new license by the Board of Public Health. Sec. 30-4-120. Regulations of Systems Cleaners. A. No person shall engage in the cleaning of sewage treatment works and On -site Wastewater Treatment Systems or the transportation of septage to a disposal site unless such person holds a valid systems cleaner license issued by the Division. Employees of a validly licensed systems cleaner shall not be required to be licensed. The initial fee for a systems cleaner license shall be as set by separate Chapter by the Board of Weld County Commissioners. Licenses shall expire on December 31 of each year and an annual renewal fee, as set by separate Chapter by the Board of Weld County Commissioners, shall be charged. A license which lapses because of failure to renew or is revoked shall be subject to the fee established for a new license upon re -application. B. Standard of Performance for Systems Cleaners. 1. A license holder, when cleaning a septic tank or aeration plant, shall remove the liquid, solids, and scum, leaving no more than three (3) inches depth of storage in a non- backflowing septic tank or aeration plant. In backflowing types of systems, cleaning shall be effective in reducing solids and scum to the point of a near new system. 2. License holders shall maintain their equipment so as to ensure that no spillage of septage will occur during transportation, and that their employees are not subjected to undue health hazards. 3. A licensed holder shall dispose of the collected septage only by the following methods: a. By disposal in a municipal sewage treatment collection system by agreement and approval of the plant manager or responsible party. b. By disposal at a site permitted and approved by the Weld County Board of Public Health in accordance with Chapter 14 of the Weld County Code pertaining to land application of septage, specifically Chapter 14, Article 6. c. The licensed systems cleaner shall provide the Division a list of the locations and legal descriptions of all disposal sites utilized for each load transported. This shall be provided monthly except for septage that is land applied. Septage which is land applied shall meet the requirements of Chapter 14, Article 6 of the Weld County Code. d. Prior to the issuance of or renewal of a license, the Division Representative may require the applicant to demonstrate adequate knowledge of Sections 30-4-120.A and B. C. Revocation of a Systems Cleaner License: The procedures described in Section 30-4-110.D. shall be followed for the revocation of a license. Sec. 30-4-130. Variance Procedure. A. General The Division may set fees for processing an OWTS permit with a variance in accordance with the provisions of Title 25, Article 10, C.R.S. This permit fee may be the standard OWTS permit fee or may be a separate fee based upon the cost of processing a permit with a variance. B, Requirements for Variance Consideration. 1. The Weld County Board of Public Health must hear variance cases and approval of a variance requires a majority vote. 2. Prior to the rendering of a decision on a variance request, a public hearing must be held. The hearing shall be the subject of a public notice or notice shall be sent via certified mail, with a minimum twenty (20) day reply time from the date of mailing, to all adjacent property owners. The applicant may submit a signed and dated statement of acknowledgment of variance from all adjacent property owners in lieu of posting or mailing. 3. Requests must be accompanied by: a. Site specific request identifying the specific criteria from which a variance is being requested. b. Technical justification by a professional engineer or professional geologist, which indicates the specific conditions which exist and/or the measures which will be taken to result in no greater risk than that associated with compliance with the requirements of the regulation. Examples of conditions which exist, or measures which might be taken, include but are not limited to the following: evidence of a natural or manmade physical barrier to the movement of effluent to or towards the feature from which the variance is requested; placement of a manmade physical barrier to the movement of effluent to or toward the feature from which the variance is requested; soil amendment or replacement with sand filter media to reduce the infiltration rate of the effluent such that the travel time of the effluent from the absorption field to the physical feature is no less than the travel time through the native soils at the prescribed setback; and treatment equivalent to Treatment Level 2. c. A discussion of alternatives considered in lieu of the requested variance; d. Technical support for selected alternative, which may include a testing program, which confirms that the variance does not increase the risk to public health and to the environment; and e. A statement of the hardship, which creates the necessity for the variance. 4. The applicant has the burden of proof of demonstrating that the variance is justified and will pose no greater risk to public health and the environment than would a system meeting the Regulations. 5. The Division has the ability to impose requirements and conditions on any variance granted. C. Variances for Repair of Failing Systems. 1. When a proposed variance for a system repair or upgrade would result in encroachment on minimum distances to physical features on neighboring properties required by the Division, the hearing procedures in Section 30-4-130.B. above, Requirements for Variance Consideration must be followed. 2. For the repair of or upgrade to an existing system where the existing system does not meet the required separation distances and where the conditions other than lot size precludes adherence to the required distances, a variance to the separation distances may be requested. The repairs or upgrade must be no closer to features requiring setbacks than the existing facilities. Variances requesting setbacks no closer than existing setbacks do not have to provide technical justification from a professional engineer or professional geologist. D. Prohibitions on the Granting of Variance Requests. 1. No variance will be issued to mitigate an error in construction involving any element of property improvements. 2. No variance will be issued where the property can accommodate a conforming OWTS. 3. No variance will be issued which will result in setbacks to an offsite physical feature which do not conform to the minimum setbacks defined in Table 30-7-1 without the board of health considering any concerns of the owner of property containing said feature. Property lines are considered offsite features. The property owner containing said feature must be notified of the time and date of the hearing. 4. No variance will be issued which reduces the separation to ground water or bedrock based on the level of treatment in Item 4, Table 30-7-2. 5. No variance from the horizontal setback from a well shall be given which does not also meet the variance requirements of the Board of Examiners of Water Well Construction and Pump Installation Contractors. 6. No variance will be allowed solely for economic gain. 7. No variance shall be issued for the installation of a higher level treatment system based on sizing or separation reductions. E. Outcome of the Variance Proceeding. The applicant shall be notified, in writing, of the decision regarding the request for a variance. The notice of a denial of a variance shall include those reasons which form the basis for the denial. The notice of an approval of a variance shall include any conditions of the approval. The variance, and any conditions thereof shall be recorded on the deed to the property, and any expenses associated with that recording shall be the responsibility of the party obtaining the variance. F. Right to Appeal. Should the Board of Public Health deny a variance under this Section, the applicant shall have the right to appeal such decision to the Weld County Board of County Commissioners pursuant to Section 3-8(4)(n) of the Weld County Home Rule Charter and the procedures promulgated thereunder. Sec. 30-4-140. General Prohibitions. A. No city, county, or city and county shall issue to any person: 1. A permit to construct or remodel a building or structure that is not serviced by a sewage treatment works until the Division has issued a permit for an OWTS. 2. An occupancy permit for the use of a building that is not serviced by a sewage treatment works until the Division makes a final inspection of the OWTS, provided for in Section 25-10-106 (1) (h), C.R.S., and the Division approves the installation. B. Use, construction or existence of cesspools, pit privies, slit trenches, and seepage pits, is prohibited. C. A person must not connect more than one dwelling, commercial, business, institutional or industrial unit to the same OWTS unless such multiple connection was specified in the application submitted and in the permit issued for the system. D. No person shall construct or maintain any dwelling or other occupied structure which is not equipped with adequate facilities for the sanitary disposal of sewage. E. All persons shall dispose of septage removed from systems in the process of maintenance or cleaning at an approved site and in an approved manner. Sec. 30-4-150. Prohibition of On -Site Wastewater Treatment Systems in Unsuitable Areas. A. The Board of County Commissioners may conduct a public hearing, after written notice to all affected property owners as shown in the records of the County Assessor and publication of notice in a newspaper of general circulation at least ten days prior to the hearing, to consider the prohibition of permits for On -site Wastewater Treatment Systems in defined areas. The Board of County Commissioners may order such prohibition upon a finding that the construction and use of additional On -site Wastewater Treatment Systems in the defined area will constitute a hazard to the public health or the environment. In such a hearing, the Board of County Commissioners may request affected property owners to submit engineering and geological reports concerning the defined area and provide a study of the economic feasibility of constructing a sewage treatment works. Section 25-10-111, C.R.S. Sec. 30-4-160. Enforcement. A. Notice of Violations. 1, Whenever the Division Representative determines that there has been a violation of any provision of these Regulations, he/she shall give notice of such violation to the responsible person(s). Such notice shall be in writing, shall specify the violation(s), provide a reasonable time for correction, and shall be addressed to the owner of the property. Service of such notice shall be as provided by the Colorado Rules of Civil Procedure or by certified mail, return receipt requested, deliverable to addressee only. Service by certified mail shall be completed upon receipt by the Division of the return receipt, or upon refusal to accept delivery by the addressee. If the property owner cannot be found or served after a reasonable effort to do so by the Division, service may be made by posting a notice in a conspicuous place on or about the property affected by the notice. A statement by the Division Representative as to why the posting was necessary shall be included in the record. B. Cease and Desist Orders. 1. The Health Officer or his/her designee may issue an order to cease and desist from the use of any OWTS or sewage treatment works which is found by the Health Officer not to be functioning in compliance with these Regulations, the OWTS Act, or with applicable regulations or is found to constitute a hazard to public health, or has not otherwise received timely repairs under the provisions of Section 25-10-106 (1) (j), C.R.S. Such an order may be issued only after a hearing which shall be conducted by the Health Officer not less than 48 hours after written notice thereof is given to the owner or occupant of the property on which the system is located. The order shall require that the owner or occupant bring the system into compliance or eliminate the health hazard within thirty (30) days, or thereafter cease and desist from the use of the system. A cease and desist order issued by the Health Officer shall be reviewable in the district court for Weld County wherein the system is located and upon a petition filed not later than ten days after the order is issued. Sec. 30-4-170. Penalties. A. Any person who commits any of the following acts or violates any of the provisions of this Section commits a Class 1 petty offense as defined in Section 18-1.3-503, C.R.S.: 1. Constructs, alters, installs, or permits the use of any OWTS without first having applied for and received a permit as provided for in these Regulations and the OWTS Act and any other applicable rules and regulations adopted thereunder; 2. Constructs, alters, or installs an OWTS in a manner which involves a knowing and material variation from the terms or specifications contained in the application, permit or variance; 3. Violates the terms of a cease and desist order that has become final under the terms of Section 25-10-106 (1) (k), C.R.S.; 4. Conducts a business as a systems contractor without having obtained the license provided for in these Regulations and the OWTS Act and any other applicable rules and regulations adopted thereunder; 5. Conducts a business as a systems cleaner without having obtained the license provided for in these Regulations and the OWTS Act and any other applicable rules and regulations adopted thereunder; 6. Falsifies or maintains improper records concerning system cleaning activities not performed or performed improperly; or 7. Willfully fails to submit proof of proper maintenance and cleaning of a system as required by these Regulations and the OWTS Act and any other applicable rules and regulations adopted thereunder. B. In addition to the penalty that may be imposed pursuant to Subsection A. above, the Board of County Commissioners, sitting as the Board of Public Health, may assess a monetary penalty pursuant to Section 25-10-113, C.R.S. C. Upon a finding by the local board of health that a person is in violation of this regulation, the local board of health may assess a penalty of up to fifty dollars for each day of violation. In determining the amount of the penalty to be assessed, the local board of health shall consider the seriousness of the danger to the health of the public caused by the violation, the duration of the violation, and whether the person has previously been determined to have committed a similar violation. D. A person subject to a penalty assessed pursuant to section 30-4-170 B. may appeal the penalty to the local board of health by requesting a hearing before the appropriate body. The request must be filed within thirty days after the penalty assessment is issued. The local board of health shall conduct a hearing upon the request in accordance with section 24-4-105, C.R.S. ARTICLE V SITE AND SOIL EVALUATION Sec. 30-5-10. Site and Soil Evaluation General Requirements. A. A site and soil evaluation must be conducted for each property on which an OWTS is proposed, to determine the suitability of a location to support an OWTS, and to provide the designer a sound basis to select the most appropriate OWTS design for the location and application. Each site evaluation must consist of: 1. Preliminary investigation; 2. Reconnaissance; 3. Detailed soil investigation; and 4. Report and site plan. Sec. 30-5-20. Preliminary Investigation. A. Preliminary investigation: Research of information relative to the site and anticipated conditions must be conducted. Information gathered as part of the preliminary investigation must include, but is not limited to: 1. Property Information: a. Address; b. Legal description; c. Existing structures; and d. Location of existing or proposed wells on the property. 2. Existing Division OWTS records. 3. Published site information: a. Topography; and b. Soil data. 4. Location of physical features, on and off the property that will require setbacks as identified in Table 30-7-1. 5. Preliminary soil treatment area size estimate based on information on existing or planned facility and local regulations. 6. Other information required by the Division. 7. Additional information that may be useful to the specific evaluation as available: a. Survey; b. Easements; c. Floodplain maps; d. Geology and basin maps and descriptions; e. Aerial photographs; f. Climate information; and g. Delineated wetlands maps. Sec. 30-5-30. Reconnaissance. A. Reconnaissance: A visit to the property to evaluate the topography and other surface conditions that will impact the location and design of the OWTS must be conducted. Information gathered as part of the site reconnaissance may include, but is not limited to: 1. Landscape position; 2. Topography; 3. Vegetation; 4. Natural and cultural features; and 5. Current and historic land use. Sec. 30-5-40. Detailed Soil Investigation. A. Soil investigations to determine the long-term acceptance rate of a soil treatment area must be conducted per the following criteria: 1. Visual and tactile evaluation of two or more soil profile test pit excavations must be conducted to determine soil type as well as to determine whether a limiting layer is encountered. 2. In addition to the two soil profile test pit excavations, percolation testing may be conducted to obtain additional information regarding the long-term acceptance rate of the soil. 3. If the site evaluation includes both a visual tactile evaluation of soil profile test pit excavations and percolation tests, and the results from these two evaluations do not coincide with the same LIAR as noted in Table 30-10-1, the designer must use the more restrictive LIAR in determining the size of the soil treatment area. B. Procedure for performing visual and tactile evaluations of soil in order to determine a long-term acceptance rate: 1. The soils evaluation shall be performed by or under the supervision of a professional engineer, professional geologist, competent technician, or other similarly qualified professional as approved by the Division. 2. Evaluation of two or more soil profile test pit excavations must be performed to determine soil types, limiting layers, and best depth for the infiltrative surface. The total number of soil profile test pit excavations beyond the required two shall be based on the judgment of the competent technician. 3. At least one of the soil profile test pit excavations must be performed in the portion of the soil treatment area anticipated to have the most limiting conditions. 4. The minimum depth of the soil profile test pit excavation must be to any limiting layer, or four feet below the infiltrative surface of the in -situ soil, whichever is encountered first. 5. Layers and interfaces that interfere with the treatment and dispersal of effluent must be noted. Thus, any limiting soil characteristic such as consistence also needs to be evaluated. The evaluation of consistence may also include an evaluation of excavation difficulty, rupture resistance, and/or penetration resistance. 6. The soil observations must be conducted at or immediately adjacent to the location of the proposed soil treatment area, but if possible, not under the final location of a trench or bed. 7. Each soil profile test pit excavation observed at the proposed soil treatment area must be evaluated under adequate light conditions with the soil in an unfrozen state. 8. The soil observation method must allow observation of the different soil horizons that constitute the soil profile. 9. Soil profile test pit observations must be conducted prior to percolation tests to determine whether the soils are suitable to warrant percolation tests and, if suitable, at what depth percolation tests must be conducted. 10. The soil type at the proposed infiltrative surface of the soil treatment area or a more restrictive soil type within the treatment depth must be used to determine the long- term acceptance rate from Table 30-10-1 or Table 30-10-1A. The treatment depth is two to four feet depending on the required thickness for the treatment level below the infiltrative surface from Item 4, Table 30-7-2. 11. Soils data, previously collected by others at the site can be used for the purposes of an OWTS design at the discretion of the local public health agency. It is recommended that the data be verified, at a minimum, by performing an evaluation of a soil profile test pit excavation. C. Soil descriptions for determination of a limiting layer must include: 1. The depth of each soil horizon measured from the ground surface and a description of the soil texture, and structure of each soil horizon; 2. Depth to the bedrock; 3. Depth to the periodically saturated soil as determined by: a. Redoximorphic features and other indicators of water levels, or b. Depth of standing water in the soil observation excavation, measured from the ground surface, if observed, unless redoximorphic features indicate a higher level. D. Procedure for performing percolation tests: 1. The percolation testing shall be performed by or under the supervision of a professional engineer, professional geologist, competent technician or other similarly qualified professional as approved by the Division. 2. Number of test holes; Location. a. Soil percolation tests shall be performed in at least three test holes in the area in which the soil treatment area is to be located, spaced evenly over the proposed area. b. if the likely depth of a proposed infiltrative surface is uncertain, percolation tests must be performed at more than one depth to determine the depth of the infiltrative surface. 3. Dimensions a. The percolation test hole must have a diameter of eight to 12 inches and be terminated a minimum of six inches and a maximum of 18 inches below the proposed infiltrative surface. 4. Change in Soil. b. If a change of soil type, color or structure is present within those soils comprising the depth of soil below the infiltrative surface as required in Table 30-7-2 for vertical separation, a minimum of two soil percolation holes must be terminated in the changed soil, and percolation tests must be conducted in both holes. 5. Percolation Tests. a. The percolation tests must be conducted using the hole preparation, soil saturation and rate measurement procedures described below. b. Preparation of Percolation Test Holes 1) Excavate the hole to the depth and diameter required, 2) Carefully scrape the bottom and sides of the hole with a knife blade or sharp instrument to remove any smeared soil surfaces and provide a natural soil interface into which water may percolate. 3) Remove all loose soil from the hole, 4) Add two inches of very coarse sand or fine gravel to protect the bottom of the hole from scouring and sediment. c. Presoak_ 1) The hole must be presoaked adequately to accomplish both saturation, which is filling the void spaces between the soil particles, and swelling, which is the intrusion of water into the individual soil particles. 2) To presoak the hole, carefully fill the hole with clean water to a minimum depth of 12 inches over the gravel placed in the bottom of the hole. In most soils, it is necessary to refill the hole by supplying a surplus reservoir of clean water, possibly by means of an automatic siphon, to maintain water in the hole for at least four hours and preferably over night. Determine the percolation rate 24 hours after water is first added to the hole. This procedure is to ensure that the soil is given ample time to swell and to approach the condition it will be in during the wettest season of the year. In sandy soils containing five percent or less particles passing the #200 sieve, by weight, the swelling procedure is not essential and the test may be conducted after the water from one filling of the hole has completely seeped out of the hole. d. Percolation Rate Measurement. 1) With the exception of sandy soils containing five percent or less particles passing the #200 sieve, by weight, percolation rate measurements must be made on the day following the presoak procedure. 2) If water remains in the percolation test hole after the swelling period, adjust the depth to approximately six inches above the gravel in the bottom of the hole. From a fixed reference point, measure the drop in water level over a 30 minute interval. The drops are used to calculate the percolation rate. 3) If no water remains in the hole after the swelling period, carefully add clean water to bring the depth of water in the hole to approximately six inches above the top of the gravel in the bottom of the hole. From a fixed reference point, measure the drop in water level at 30 minute intervals for four hours, refilling to six inches over the top of the gravel as necessary. The drop in water level that occurs during the final 30 -minute period is used to calculate the percolation rate. If the water level drops during prior periods provide sufficient information, the procedure may be modified to suit local circumstances. The requirement to conduct a four hour test under this Section is waived if three successive water - level drops do not vary by more than 1/16 inch; however, in no case shall a test under this Section be less than two hours in duration. e. Sandy Soils. 1) In sandy soils or other soils in which the first six inches of water seeps out of the hole in less than 30 minutes, after the 24 hour swelling period, the time interval between measurements must be ten minutes and the test conducted for one hour. The drop that occurs during the final ten minutes must be used to calculate the percolation rate. 2) If the soil is so sandy or coarse -textured that it will not retain any water, then the infiltration rate must be recorded as less than one minute per inch. f. Percolation Rate Determination and Reporting. 1) The field percolation rate will be the average rate of the percolation rates determined for all percolation test holes observed in the proposed soil treatment area in minutes per inch. The average percolation rate determined by the tests must be used in determining the long-term acceptance rate for the proposed system from Table 30-10-1. 2) The technician performing the percolation tests shall furnish an accurate scale drawing, showing the location of the soil profile test pit excavations and/or percolation holes tied to lot corners or other permanent objects. The drawing must meet the criteria in Section 30-5-60.A.7. All holes must be clearly labeled to relate to the information provided for the profile test pits and percolation tests. h. Alternate Percolation Testing. 1) Alternate percolation test procedures may be approved, provided the test results of alternate procedures are substantially equivalent to those determined using the test procedures described in this Section. 2) Prior approval from the Division of alternate percolation test procedures is required. Sec. 30-5-50. Marking of Soil Profile Test Pit Excavations or Percolation Holes. The soil profile test pit excavations or percolation holes, must be flagged or otherwise marked to allow easy location by others. Percolation holes must remain open until after evaluation by the Division. The soil profile test pit excavations may be backfilled after evaluation by the third party professional {professional engineer, geologist, competent technician, or other similar professional}. If the profile test pit excavation is backfilled prior to inspection by the Division, a monitoring port shall be installed prior to backfilling for evaluation by the Division. Soil test pit excavations that are left open must be suitably barricaded to prevent unauthorized access and to address safety concerns. Sec. 30-5-60. Report and Site Plan. A. A written report must describe the results of the preliminary investigation, reconnaissance, and detailed evaluations. The report may be in text and/or tabular form and must include a drawing locating features relative to the proposed OWTS location and test locations. The report may be included as part of the OWTS design document. The report must include, but is not limited to: 1. Company name, address, telephone number, e-mail address, and name of individual, credentials and qualifications of the individual conducting the site evaluation; 2. Preliminary and detailed evaluations, providing information from the surface site characteristics assessment and soils investigation; 3. Dates of preliminary and detailed evaluations; 4. A graphic soil log, to scale, indicating depth of the soil test pit excavation, soil description and classification, depth to any limiting layer encountered, type of equipment used to excavate the soil profile test pit, and date of soils investigation. 5. Setback distances to features listed in Table 30-7-1; 6. Setback distances to features listed in Table 30-7-2, existing on the site or within applicable setback limits, whichever is greater; 7. A drawing created to a scale that provides the complete property boundary lines. The minimum drawing size is 8.5 -inches by 11 -inches. If the property is too large to adequately indicate and label the profile test pits and percolation test holes, a detail of the portion of the site containing the soil profile test pits and percolation test holes must be submitted. If the property is too large to adequately show site evaluation information, a detail drawing that includes the information required from the site and soil evaluation that will impact the location of the OWTS must be submitted. Drawings must indicate dimensions, have a north arrow and graphic scale and include: a. Fixed, non -degradable temporary or permanent benchmark, horizontal and vertical reference points of the proposed soil treatment area; soil observations; percolation testing results and pertinent distances from the proposed OWTS to all required setbacks, lot improvements, easements; ordinary high water mark of a pond, creek, stream, lake, wetland or other surface waters, and detention or retention ponds; and property lines; b. Contours or slope direction and percent slope; c. The location of any visible or known unsuitable, disturbed or compacted soils; d. The estimated depth of periodically saturated soils and bedrock, or flood elevation, if applicable; and e. The proposed elevation of the infiltrative surface of the soil treatment area, from an established datum (either ground surface or a benchmark). 8. Anticipated construction -related issues, if applicable; 9. An assessment of how known or reasonably foreseeable land use changes are expected to affect the system performance, including, but not limited to, changes in drainage patterns, increased impervious surfaces and proximity of new water supply wells, if applicable; and 10. A narrative explaining difficulties encountered during the site evaluation, including but not limited to identifying and interpreting soil and landform features and how the difficulties were resolved, if applicable. Sec. 30-5-70. Design Document. A. The report and site plan may be attached to the design document or the report and site plan may be combined with the design information as a single document. B. The design document must include a brief description of the facility and its proposed use, basis and calculations of design flow, and influent strength. C. The design document must contain all plan detail necessary for permitting, installation and maintenance, including: 1. Assumptions and calculations for each component, including total dynamic head (TDH) and gallons per minute (GPM) for all dosing systems; 2. A fixed, non -degradable temporary or permanent benchmark, (North America Vertical Datum or assumed elevation is acceptable); 3. A scale drawing showing location of each OWTS component and distances to water supplies, surface water, physical and health impact features on both the subject and adjacent properties requiring setbacks; 4. Layout of soil treatment area, dimensions of trenches or beds, distribution method and equipment, distribution boxes, drop boxes, valves, or other components used; 5. Elevation or depth of infiltrative surface of the soil treatment area, the septic tank invert, and all other components of the OWTS; 6. Special structural design considerations, as applicable to ensure the long-term integrity of each component; 7. References to design manuals or other technical materials used; 8. Installation procedures, as applicable; 9. Operation and maintenance manuals or instructions; and 10. Other information that may be useful such as photos and cross-section drawings. Sec. 30-5-80. Site Protection. Prior to and during construction, the proposed soil treatment area and replacement area, if any, must be protected from disturbance, compaction, or other damage by means of staking, fencing, posting, or other effective methods. Sec. 30-5-90. Qualifications for a Competent Technician. A. Percolation Tests. 1. Competencies needed: a. Set up equipment; b. Perform and run percolation tests according to the procedure in this Regulation; and c. Record results and calculate percolation rates. 2. The Division may approve training for percolation testing. B. Visual and Tactile Evaluation of Soil. 1. Competencies needed: a. Identify soil types by hand texturing and observation; b. Identify presence or absence of soil structure; c. Identify type and grade of soil structure; d. Recognize evidence of highest seasonal water surface; e. Identify layers and interfaces that will interfere with effluent movement; f. Determine the most promising depth for infiltrative surface of OWTS and for percolation tests, if used; and Understand basic principles of OWTS siting and design. 9. 2. Possible demonstrations of competence in visual and tactile evaluation of soil: a. Degree in soil science, agronomy, geology, other majors if a course(s) in soil morphology was included; or b. Attendance at training or workshop for soil evaluation for OWTS including both class and field work. (1) If the training or workshop includes an exam to verify acceptable completion of the course, a passing grade on the exam must be attained. 3. The Water Quality Control Division must approve training for visual and tactile evaluation of soil. ARTICLE VI WASTEWATER FLOW AND STRENGTH Sec. 30-6-10. Wastewater Flows. A. The Division may require the installation of a meter to measure flow into the facility or the OWTS. B. Single -Family Residential Homes. 1. Design flow per person must be 75 gallons per day (gpd). 2. The minimum design flow for a new home must be for a two -bedroom house, unless otherwise noted in this regulation. The minimum design flow for the repair or replacement of an OWTS of an existing one -bedroom home must be for one -bedroom unless bedrooms are added. 3. For homes up to and including three bedrooms, the assumed number of persons per bedroom is two for design purposes. 4. For homes with more than three bedrooms, the assumed number of persons is six persons (first three bedrooms x two persons per bedroom) plus one additional person for each bedroom more than three bedrooms. 5. Table 30-6-1 summarizes the design flows for single-family residential homes up to six bedrooms. Table 30-6-1 Single -Family Residential Design Flows # Bedrooms 2 3 Occupancy (# of Persons) 4 5 6 C. Auxiliary Buildings 4 6 7 8 Wastewater Flow Per Person (gallons/day) 9 75 75 Design Flow (gallons/day) 75 75 75 300 450 525 600 675 1. If a single-family home has an auxiliary building, such as a non-commercial shop with plumbing fixtures, the flow may be conveyed to the OWTS of the home, or to a separate OWTS constructed to handle the flow from the auxiliary facility. 2. If the flow from the auxiliary building is only generated by residents of the home, it will be assumed that the OWTS for the home will be adequately sized to include the auxiliary building if the flows are combined. 3. If the auxiliary building will have users in addition to residents and the flow from the auxiliary building will flow to the OWTS of the home, the design flow of the home must include the increased use. 4. If the auxiliary building has a separate OWTS, the facility must be sized on the basis of Table 30-6-2 and a septic tank detention time of 48 hours. D. Multi -Family and Commercial On -site Wastewater Treatment Systems. 1. Design flow values and strengths for multi -family and commercial systems must be determined from: a. Table 30-6-2; or b. An analysis of flows and strengths from at least three comparable facilities or from the facility, if it is an existing facility, must be submitted to the Division for approval. The analysis must include: 1) Metered water flows for inside use only for at least a year, or if use is seasonal, for a full season. If metered flows are less than full capacity, they must be paired with actual use in units of persons present or meals served or other units as appropriate so that an actual daily rate per unit can be determined. The daily rate per unit times the number of units at full occupancy will be the design flow. 2) Total Suspended Solids and BOD5 or CBOD5 tests at times of full use. At least three samples taken at least one week apart are required. Sampling that provides equivalent and representative data through "composite sampling" may be allowed. 3) Explanation and justification for the comparability of the tested facilities with the proposed facility. E. Flow Equalization. 1. Flow equalization may be used if a facility has flows that vary from day to day by more than four times the average flow. 2. The highest peak assumed must be at least equal to the full capacity of the facility. 3. The stored flow must be distributed to the soil treatment area before the next greater - than -average peak. 4. Flow equalization may be used only if: a. The facility is non-residential; b. The facility is only used for one purpose; c. Flows will follow a predictable pattern; and d. There is a long-term expectation that size and pattern of the flows will remain the same. 5. Timed dosed pressure distribution or timed dosed NDDS must be used. The soil treatment area reduction for pressure distribution must not be used in addition to the flow equalization reduction. 6. Contingency plans must be made for expanding the capacity of the OWTS in the event of changed use at the facility. TABLE 30-6-2 Estimate of Average Daily Wastewater Flow and BOD5 Load Per Person Unless Otherwise Noted RESIDENTIAL WASTEWATER GPD BOD5 IN POUNDS PER DAY Single-family dwellings 75 Auxiliary buildings by fixture type .20 Bath/Shower Dishwasher Kitchen sink with garbage grinder Laundry washer 14.7 1.8 5.8 19.5 .014 .002 052 Lavatory 8.4 .037 .021 Water closet (toilet) 24.8 Hotels and motels per room 75 029 .15 Multiple -family dwellings or apartments 75 Boarding and rooming houses (users absent during working hours) 50 .20 Tiny Homes***, per unit 150 Mobile home 75 Mobile home park per space 300 COMMERCIAL WASTEWATER GPD Facilities with short-term or transient visitors Examples: Airports or bus stations per passenger; fairgrounds per person attending; ball parks, race tracks, stadiums, theaters or auditoriums per seat 5 15 .40 .20 .80 BOD5 IN POUNDS PER DAY Airport per employee 10 .02 06 Barber and beauty shops per chair 100 Bowling alleys per lane - toilet wastes only 5 .70* 03* Country club per member 30 County club per employee 20 .02 06 Dentist offices per non -wet chair 50 .14* Doctor offices per doctor 250 80* Factories and plants exclusive of industrial wastewater per employee per eight -hour shift — no showers 20 35 05 08 Factories and plants exclusive of industrial wastewater per employee per eight -hour shift - showers provided Kennels per dog 30 .20 Laundries, self-service per commercial washer 400 .75 Office buildings per employee per eight -hour shift 15 .06 Service stations per toilet fixture 250 .50* Stores and shopping centers per square foot of retail space .1 .01* Work or construction camps semi -permanent with flush toilets 50 .17 Work or construction camps semi -permanent without flush toilets 35 02 FOOD SERVICE ESTABLISHMENT GPD BODE IN POUNDS PER DAY Restaurant open 1 or 2 meals per seat 50 .06/meal .07/meal served 24 -hour restaurant per seat 75 Restaurant with paper service only per seat 25 01/meal served Additional for bars and cocktail lounges per seat 30 .02 Drive-in restaurant per car space 50 02 INSTITUTIONAL WASTEWATER WITHOUT KITCHENS UNLESS OTHERWISE NOTED GPD BODE IN POUNDS PER DAY Churches per seat; without any food service, or other uses 3.5 .01 Churches, per seat; warming kitchen only, no major food service 5 01 Churches, per seat; with food service, per meal served**** 4 .02 Hospitals per bed space 250 .20 Nursing homes; Group homes for developmentally disabled, per bed space 125 .20 Schools, Boarding per person 100 .17 Schools, Day without cafeteria, gym or showers 15 04 Schools, Day with cafeterias, no gym or showers Schools, Day with cafeterias, gym and showers Schools, Day additional for school workers 20 25 15 .08 RECREATIONAL AND SEASONAL WASTEWATER USE GPD Camps, day, no meals served Luxury resort Resort night and day Campground per campsite** 15 125 10 06 BOD5 IN POUNDS PER DAY 12 17 Public park flush toilet per fixture per hour when park is open Public park urinal per fixture per hour when park is open 50 12 50 .12 36 .04 lbs./ fixture 10 .01 lbs./fixture Public park shower per fixture per hour when park is open Public park faucet per fixture per hour when park is open Swimming pools and bathhouses 100 I .10 lbs./ fixture 15 I .04 lbs./ fixture Travel trailer parks with individual water and sewage hookup per unit ** Travel trailer park without individual water and sewage hookup per unit ** 10 I .06 100 I .24 50 I .12 *BOD levels need further verification depending on the specific use of the facility. **Laundry facilities are to be calculated on a per commercial washer basis in accordance with other elements of this table ***For the purpose of this Table, a "Tiny home" is a structure that has only one bedroom and has <400 sq. ft. of livable space, including lofts. In this instance, the OWTS may be sized for only one bedroom. ****For churches with food service, the 4 gal/meal must be added to the 3.5 gal/seat to determine projected design flows. Sec. 30-6-20. Wastewater Strength. A. Table 30-6-3 includes levels of treatment that can be achieved by various OWTS components, excluding the soil treatment area. Systems qualifying for these treatment levels except TL1 produced by a septic tank alone must be approved by the Water Quality Control Division under Section 43.13. of OWTS Regulation #43. B. High strength waste must be reduced to at least Treatment Level TL1 quality or lower before applying to a soil treatment area. Waste strength levels defined in Tables 30-6-3 and 30-6-4 must be used to determine compliance. Table 30-6-3 Treatment Levels Treatment Level TL 12 RODS (mg/L) CBODs, (mg1L) TSS (mg/L) Total Nitrogen (mg/L) 180 _ 80 60-80 TL 2 25 30 N/A3 TL 2N - 25 30 >50% reductions TL 3 - 10 10 N/A3 TL 3N - 10 10 20 mg/L (Shading indicates higher treatment levels 1 Requirements for CBODs are only related to effluent samples from a higher level treatment system. 2 Domestic septic tank effluent prior to soil treatment or higher level treatment has a wide range of concentrations. These values are typical, but values used for design must account for site -specific information. 3 Total Nitrogen does not apply to Treatment Levels TL2 and TL3. Processes intended to reduce total nitrogen are addressed in Treatment Levels TL2N and TL3N. Any total nitrogen reductions that may be observed for TL2 and TL3 are as a result of the treatment process for BOD5 and TSS reductions. 4 NSF/ANSI Standard 245 — Wastewater Treatment Systems — Nitrogen Reduction requires reduction of 50 percent rather than an absolute value. Table 30-6-4 High Strength Wastewater* Septic Tank Influent Septic Tank Effluent BOD5 (mg1L) >300 >180 TSS (mg/L) >200 Fats, Oils, Grease FOG ma1L >50 X80 >25 *High strength effluent prior to a septic tank has a wide range of concentrations. The values are typical, but values used for design purposes must account for site -specific information. ARTICLE VII MINIMUM DISTANCES BETWEEN COMPONENTS OF AN ON -SITE WASTER TREATMENT SYSTEM AND PHYSICAL FEATURES Sec. 30-7-10. Minimum Horizontal Distances. A. Horizontal distances from the various components of an OWTS to pertinent terrain features, including streams, lakes, water courses, springs, wetlands, wells, subsurface drains, cisterns, water lines, suction lines, dry gulches, cut banks, dwellings, other occupied buildings and property lines, must be in accordance with Table 30-7-1. The setback requirements are applicable for minimum system performance and treatment as provided in Table 30-7-2. All distance setback modifications must be analyzed and approved by the Board of Public Health and be in complete compliance with the variance procedures of this Regulation. Acceptable methods of analyzing horizontal separation distances with higher treatment levels include but are not limited to: 1. Analyzing the intended uses of impacted surface and/or ground waters; 2 Contacting adjacent property owners for potential conflicts with property line encroachments; and 3. Analyzing potential impacts that system locations may have on building foundations and other potentially affected features. Sec. 30-7-20. Dry Gulches, Cut Banks and Fill Areas. A. Separation distances to dry gulches, cut banks and fill areas in Table 30-7-1 must apply unless the designer or design engineer determines by observation of the exposed slope of the dry gulch or cut bank or by soil profile test pit excavations that a limiting layer is present that will direct or allow the effluent from the soil treatment area to move laterally and surface. In this instance, a greater distance may be required. B. A lesser distance may be used if it can be demonstrated by a professional engineer or professional geologist that the use of a barrier, such as a minimum 30 mil PVC liner placed between the soil treatment area and the slope of the dry gulch, cut bank or fill area will prevent effluent surfacing laterally. C. The separation distance between a component and the crest of a dry gulch or cut bank will be evaluated for potential erosion or slope instability if the component and the slope are too close together. If there is potential for erosion or instability, the separation distance must be increased until the risk is minimized. Sec. 30-7-30. On -site Wastewater Treatment System Design Consideration and Treatment Requirements — Separation Distances from Soil Treatment Area. A. Table 30-7-2 provides the required site evaluation, design, and treatment level considerations necessary to evaluate the site and to design and locate the soil treatment area component of an OWTS. B. Items 1, 2 and 3 in Table 30-7-2 address the allowable horizontal setback distance between the soil treatment area and the following physical features: 1. Setback distance from soil treatment area to on -site well; 2. Setback distance from soil treatment area to water features; and 3. Setback distance from soil treatment area to a dry gulch or cut bank. C. Item 4 in Table 30-7-2 addresses the required vertical separation distance between the infiltrative surface of the soil treatment area and the limiting layer or the required depth of soil comprising the soil treatment area. 0_ C \m�2Ra _� 6592§ G Tu 2 2. f •Lc i_ 0' c<22 0Q�_ c2 —Q 0 6 ±\(\k$k �c S 7 = it'_ 2 oTo �=#§ casE Et I6 ER 7f t_ =e m _ �(\2k5/.. f\ 7a - S 0 '0 n to & 0 Lo O \ O 0 0 to 0 \ 0 0 0 0 & O LO 0 0 O 2 S 0 tO e=§ ��% gt/$$.- W /) Q CW Q _ 0 G f f n c / C.4 0 / \ 2 / Building Sewer or Effluent Lines a 2 2 co / \ 0 Lined Sand Filter / I• f tj en 0 CO\ CO/ w§ 2� \ a- k k $ NOTE: The minimum distances shown above must be maintained between the OWTS components and the features described. Where soil, geological or other conditions warrant, greater distances may be required by the Board of Public Health or by the Water Quality Control Commission pursuant to Section 25-8-206, C.R.S. and applicable regulations. For repair or upgrading of existing OWTS where the size of lot precludes adherence to these distances, a repaired OWTS shall not be closer to setback features than the existing OWTS, as reviewed and approved by the Water Quality Control Division. Components that are not watertight should not extend into areas of the root system of nearby trees. 1 Includes potable wells, irrigation wells and monitoring wells set within a potable aquifer and infiltration galleries permitted as wells by the Division of Water Resources. 2 Crossings or encroachments may be permitted at the points as noted above provided that the water or wastewater conveyance pipe is encased for the minimum setback distance on each side of the crossing. A length of pipe with a minimum Schedule 40 rating of sufficient diameter to easily slide over and completely encase the conveyance must be used. Rigid end caps of at least Schedule 40 rating must be glued or secured in a watertight fashion to the ends of the encasement pipe. A hole of sufficient size to accommodate the pipe must be drilled in the lowest section of the rigid cap so that the conveyance pipe rests on the bottom of the encasement pipe. The area in which the pipe passes through the end caps must be sealed with an approved underground sealant compatible with the piping used. Other methods of encasement that provide equal protection am allowed. These methods must be designed by a professional engineer and approved by the local public health agency. 3 Add eight feet additional distance for each 100 gallons per day of design flows between 1,000 and 2,000 gallons per day, unless it can be demonstrated by a professional engineer or geologist by a hydrologic analysis or the use of a banier, consisting of a minimum 30 mil PVC liner or equivalent, that contamination will be minimized. All horizontal setbacks to a potable water supply cistern must be met unless a variance by the Board of Examiners of Water Well Construction and Plumb installation Contractors is granted per section 11,4 of the Water Well Construction Rules, 2 CCR 402-2. The minimum horizontal setback that may be granted through a variance is to 25 feet. 5 If the structure is not used as a habitable unit, the isolation may be reduced by the local board of health to no less than 50 feet. 6 Building sewer installations shall meet the design requirements of the Colorado Plumbing Code. Table 30-7-2 On -site Wastewater Treatment System Design Consideration and Treatment Requirements - Separation Distances from Soil Treatment Area ITEM OWTS DESIGN CONSIDERATION All Treatment Levels 1 Horizontal Separation Distances Distance from soil treatment area to on -site well 2 3 Distance from soil treatment area to pond, creek, lake, or other surface water feature Greater than or equal to 100 feet Greater than or equal to 50 feet Distance from soil treatment area to dry gulch or cut bank Vertical Separation Distances Greater than or equal to 25 feet 4 Treatment depth in feet from infiltrative surface to a limiting layer 4 feet (3 feet with pressure dosing) NOTE: Treatment levels are defined in Table 30-6-3. ARTICLEVIII DESIGN CRITERIA - GENERAL Sec. 30-8-10. Performance. A. The OWTS for single-family homes shall be designed to accommodate the proposed flows from the structure as defined in 30-6-10. B. Flow estimates for multi -family or commercial OWTS must comply with 30-6-10.D.1. Expected waste strength as noted in Table 30-6-3 and Table 30-6-4 must also be addressed, where applicable. Installation of low flow fixtures or the separation of toilet waste or other sources of wastewater does not allow for the reduction in the size of an OWTS. B. OWTS shall be designed and constructed to achieve the treatment level specified by the design. Sec. 30-8-20. Reliability, OWTS must be designed and constructed such that each component shall function, when installed and operated, in a manner not adversely affected by normal operating conditions including erosion, corrosion, vibration, shock, climatic conditions, and usual household chemicals. Each component must be free of non-functional protrusions or sharp edges, or other hazards, which could cause injury to persons, animals, or properties. Design must be such as to exclude flies and rodents and other vectors and to prevent the creation of nuisances and public health hazards and must provide for efficient operation and maintenance. Sec. 30-8-30. Accessibility for Inspection, Maintenance, and Servicing. A. Septic tanks must have watertight risers over each access manhole and all risers must extend to or above final grade. B. For new construction, the top of any septic tank, dosing tank or vault must be no deeper than four feet below finished grade. C. Each treatment component of an OWTS other than the septic tank and soil treatment area shall be equipped with access manholes with risers that extend to or above final grade, located to permit periodic physical inspection, collection and testing of samples and maintenance of all components and compartments. D. Riser Lids 1. Each riser lid must be watertight, brought to or above the surface, and must have a secure closing mechanism, such as a lock, special headed bolts or screws, or sufficient weight (defined as 59 pounds) to prevent unauthorized access. E. Components that require access for maintenance must include but not be limited to submerged bearings, moving parts, pumps, siphons, valves, tubes, intakes, slots, distribution boxes, drop boxes, cleanouts, effluent screens, filters, inlet and outlet baffles, aerators, treatment equipment and other devices. F. Components must be designed and constructed so that, when installed, they must be easily maintained, sampled, and serviced according to the manufacturer's recommendations. Easy physical access to treatment components by maintenance personnel and equipment must be provided. Sec. 30-8-40. Plumbing Codes. Plumbing fixtures, building sewers, vents, sewer lines and other appurtenances must be designed, operated and maintained so as to comply with the minimum requirements of the locally enforced plumbing code. In the absence of a local plumbing code, designs must adhere to the Colorado Plumbing Code (3 CCR 720-1). A local plumbing permit may be required. Sec. 30-8-50. Electrical Equipment. A. All electrical work, equipment, and material must comply with the requirements of the locally enforced code. A local electrical permit may be required. B. Electrical components must be protected from moisture and corrosive gases. Sec. 30-8-60. Indicators of Failure or Malfunctioning for Systems Utilizing Mechanical Apparatus. A signal device must be installed which will provide a recognizable indication or warning to the user that the system or component is not operating as intended. This indication or warning must be a visual signal and an audible signal and must be located in a centralized area within visual and audible range of the system user. A signal or message may also be sent remotely to a maintenance provider. Sec. 30-8-70. Sampling Access. A. If sampling for testing or as a requirement for a permit will be required of effluent from a component other than the soil treatment area, an accessible sampling point must be provided. B. If sampling of the treated wastewater from the soil treatment area will be required for testing or as a requirement for a permit, a monitoring well or wells must be constructed. Monitoring wells must be located down gradient from the soil treatment area, accessible, and provided with a properly securable cover at or above the ground surface. Monitoring wells up gradient of the system may also be required. Lysimeters or other collection devices under the soil treatment area may be used instead of a monitoring well. Sec. 30-8-80. Component Operating Instructions, A. The manufacturer of proprietary treatment units utilizing mechanical components must provide clear, concise written instructions covering the components which, when followed, must assure proper installation and safe and satisfactory operation and maintenance. B. If the OWTS uses public domain technology, the design engineer must provide clear, concise written instructions covering the components which, when followed, must assure proper installation and safe and satisfactory operation and maintenance. Sec. 30-8-90. Surface Activity. Activity or use on the surface of the ground over any part of the OWTS must be restricted. The soil treatment area must not be subject to damage or soil compaction from livestock, vehicular traffic, recreational use, or other site development activity. Construction equipment not necessary to install the OWTS must be kept off of the soil treatment area to prevent undesirable compaction of the soils. If compaction occurs, the disturbed or compacted soil must be re-evaluated and/or new soil evaluations performed. The system must be redesigned if the soil permeability has changed. Sec. 30-8-100. Floodplains. A. A new, expanded or repair/replacement OWTS installed in a 100 -year floodplain must meet or exceed the requirements of the Weld County Flood Plain Management Ordinance contained in Chapter 23 and the Federal Emergency Management Agency. Repairs of an existing system must meet the requirements as feasible. The system as approved by the Division must be designed to minimize or eliminate infiltration of floodwaters into the system and discharge from the system into the floodwaters. The OWTS must be located to avoid impairment to floodwaters or contamination from them during flooding. The Division has available a floodplain guidance document. B. Anew or expanded OWTS must not be installed in a floodway designated in a 100 -year floodplain where a conforming OWTS outside the floodway can be installed. For any new OWTS or system repair that may affect the floodway delineation, appropriate procedures must be followed including revision of the floodway designation, if necessary. Sec. 30-8-110. Business Commercial, Industrial, Institutional or Multi -Family Dwelling Wastewater Systems. A. An OWTS that will serve a business, commercial, industrial or institutional property, or a multifamily dwelling must: 1. Be designed by a professional engineer; 2. Receive only such biodegradable wastes for treatment and distribution as are compatible with those biological treatment processes as occur within the septic tank, any additional treatment unit and the soil treatment area; and 3. Receive authorization by rule or a class V underground injection permit from the United States Environmental Protection Agency (EPA) before an application for an OWTS permit is approved if the system may receive non-residential wastewater or is otherwise covered by the EPA underground injection control program. Subsequent to acceptance by the EPA, the Division may choose to also issue a permit for this type of use. ARTICLE IX DESIGN CRITERIA - COMPONENTS Sec. 30-9-10. Tanks and Vaults. A. Watertightness 1. Septic tanks, vaults, dosing tanks, other treatment components, risers and lids must not allow infiltration of ground water or surface water and must not allow the release of wastewater or liquids through other than designed openings. 2. When the final compartment of a tank is being proposed for use as a pump or siphon chamber, the wall between this chamber and the previous chamber must be watertight except for the intended hydraulic opening. 3. Acceptable watertightness testing methods performed at a manufacturer's site or in the field include water filling the tank or vacuum testing. B. Tank Anchoring: In locations where ground water or floodwaters may cause instability problems to the septic tank, vault, or other treatment unit in the OWTS due to flotation, the tank, vault or unit must be anchored in a manner sufficient to provide stability when the tank is empty. Risers must be included in the buoyancy calculations. 1. If a manufacturer provides recommendations for anchoring designs, they may be used if they meet the conditions present at the site. 2. If a manufacturer does not provide recommendations for provisions to compensate for buoyancy, or if the professional engineer chooses to provide his/her own designs, the anchoring system design must be prepared by the professional engineer. C. Identification and Data Marking: All tanks and treatment units must be permanently and legibly marked in a location for the purpose of inspection that is readily visible when inspected before backfilling. The marking inscription must include the following: 1. Name of manufacturer; 2. Model or serial number, if available; 3. Effective volume and unit of measure; 4. Maximum depth of earth cover and external loads the tanks is designed to resist; and 5. Inlet and outlet identifications, if relevant. Sec. 30-9-20. Septic Tanks. A. The manufacturer must provide sufficient information to demonstrate that the tank will meet the design specification. B. Sizing Requirements: 1. Sizing for residential capacity for new installations must be based upon the number of bedrooms according to Table 30-9-1 Table 30-9-1 Minimum Septic Tank Size Based on Number of Bedrooms Number of Bedrooms 2 or 3 Tank Capacity (gallons) 4 1,000 Each Additional 1,250 250 2. For multi -family and non-residential applications, a septic tank must be sized to permit detention of incoming wastewater design flows for a minimum of 48 hours. 3. For systems that remove toilet waste for separate treatment, tank capacity may be less than 1,000 gallons, if it provides a minimum of 48 hours detention time. 4. Minimum tank size for new installations other than for a single-family residence is 400 gallons. C. Inspection and Testing of Septic Tank Watertightness. 1. Testing of septic tanks must be performed and evaluated as specified in Section 9 of ASTM C1227-13 (Standard Specification for Precast Septic Tanks) for concrete tanks or in Standard IAPMO/ANSI 21000-2013 (American Standards for Prefabricated Septic Tanks) for other prefabricated septic tanks. 2. Each unit must be inspected in the field for conditions that may compromise its watertightness. 3. The inspection in the field must be conducted by the Division and be performed after the tank installation but before backfilling. 4. If the inspection in the field indicates that the tank may be damaged or is not watertight, the Division Representative may require that the tank be tested for watertightness by the tank manufacturer or the system contractor. D. Septic Tank Design and Dimension Criteria. 1. A septic tank must have two or more compartments or more than one tank may be used in series. The first compartment of a two -compartment tank or the first tank in a series must hold no less than one-half of the required effective volume. 2. Inlet invert must be at least two inches higher than the outlet invert. 3. Inlet tee or baffle must extend above the surface of the liquid at least five inches and must extend a minimum of eight inches below the liquid surface. However the inlet tee or baffle must not extend to a depth of more than 40 percent of the liquid depth measured from the liquid surface. 4. Outlet tee or baffle must extend at least 5 inches above and 14 inches below the outlet invert, however it must not extend to more than 40 percent of the liquid depth measured from the liquid surface. The outlet tee or baffle that accommodates an effluent screen must be located so that the effluent screen has sufficient clearance to be removed through the access opening with a riser in place. 5. The distance from the outlet invert to the underside of the tank top must be at least ten inches. 6. Liquid depth must be a minimum of 30 inches and the maximum depth must not exceed the tank length. 7. The transfer of liquid from the first compartment to the second or successive compartment must be made at a liquid depth of between 35 and 40 percent of the liquid depth measured from the liquid surface. 8. At least one access opening no less than 20 inches across must be provided in each compartment of a septic tank. 9. A septic tank must have a minimum of 25 square feet of liquid surface area and have at least a six-foot separation between inlets and outlets. Septic tanks in series, combined, must have a minimum of 25 square feet of liquid surface area and the sum of the distances between inlets and outlets of all tanks must be at least six feet. The requirements for liquid surface area and separation between inlet and outlet may be waived for tanks with less than 750 gallon effective volume. E Concrete Septic Tank Structural Design. 1. Concrete septic tanks must comply with the structural design criteria of ASTM O1227- 13 (Standard Specification for Precast Septic Tanks). 2. The design for each tank model and size by each manufacturer must be certified by a professional engineer as complying with these design and structural requirements and the watertightness standard of this Regulation. 3. Certification by a professional engineer must be submitted to the Water Quality Control Division for acceptance. 4. Tank slab lids, mid -seam tanks, and the connections between the tank and risers must be designed to provide for a watertight seal. F. Fiberglass, Fiberglass -Reinforced Polyester, and Plastic Tanks. 1. All fiberglass, fiberglass -reinforced polyester, and plastic tanks must meet the minimum design and structural criteria of IAPMO/ANSI Z1000-2013 (American Standards for Prefabricated Septic Tanks) and be certified by a professional engineer as meeting these standards. The professional engineer certifying the criteria must be registered or licensed in the United States, but need not be registered in Colorado. 2. All tanks must be sold and delivered by the manufacturer or manufacturer's designated representative, preferably completely assembled. On -site tank assembly will be allowed on an as -needed basis. 3. Tanks must be structurally sound and support external forces as specified in the standard referenced above when empty and internal forces when full. Tanks must not deform or creep resulting in deflection of more than five percent in shape as a result of loads imposed. 4. All tanks must be constructed of sound, durable materials and not be subject to excessive corrosion, decay, frost damage, or cracking. 5. All seams or connections including to risers must be sealed to be watertight. G. Metal tanks are prohibited. Sec. 30-9-30. Abandonment of Tank. A. The contents of a tank shall be pumped by a Weld County licensed systems cleaner and properly disposed by methods specified in Section 30-4-120. B. 3. B. A tank may be completely removed and the parts disposed of safely. C. If the tank will remain in place: (see Sec. 30-9-30.A) 1. The bottom of the tank must be broken so the tank neither floats nor fills with water; 2. The top must be collapsed and the sides may be broken into the void; 3. The remaining void must be filled with gravel, sand or compacted soil; and 4. The filled excavation will be graded to surroundings, allowing for settling D. The Division requires abandonment of a tank that is deemed to be a hazard. Sec. 30-9-40. Pipe Standards and Bedding Requirements. A. Pipe Standards 1. All wastewater pipes used in portions of an OWTS that are pressurized must be constructed of compatible pipe, primer, bonding agent, and fittings. Flexible couplings to connect pipes may only be used in portions of an OWTS that are intended for gravity flow of the wastewater. 2. Where unperforated plastic pipe and fittings are used for gravity flow, the minimum wall thickness of the pipe must conform to ASTM Standard D 3034 or equivalent or greater strength. Schedule 40 pipe is preferred. 3. Perforated distribution pipe surrounded by rock within a soil treatment area must have a minimum wall thickness and perforations conforming to ASTM Standard D 2729 or equivalent or greater strength. Corrugated polyethylene pipe with smooth interior that meets ASTM F405 or AASHTO M252 specifications or equivalent may be used. 4. Schedule 40 or pipe of equivalent or greater strength must be used for the placement of piping under driveways or roadways and in instances where sewer line setback distances are granted a variance for any reason. 5. Tile pipe, open -joint pipe, and cast iron pipe must not be used in an OWTS. 6. Pressure pipe must be rated for the intended use to accommodate pump discharge pressure. B. Bedding: All system piping, except for distribution laterals within the soil treatment area, must be bedded with select material before final inspection by the Division. Select bedding material must consist of loose, granular material, free from stones, clods, frozen soil, or other deleterious material. Select material may consist of on -site job -excavated or imported material. Bedding material must be mechanically compacted to support piping. C. Pipe identification and data marking must be visible for the purpose of inspection before backfilling. Section 30-9-50 Cleanouts A. Cleanouts required between the building and the septic tank: 1. Cleanouts must have a secure cap and a riser extending to or easily accessible from grade. The installation of a straight tee or sanitary tee is acceptable. 2. Cleanouts must be provided within five (5) feet of the outside of the building. 3. Where a sewer has a change of horizontal direction greater than 45 degrees, a cleanout must be installed at the change of direction unless a cleanout already exists within 40 feet upstream of this fitting. Where more than one change of direction greater than 45 degrees occurs within 40 feet of a developed length of piping, the cleanout for the first change of direction may serve as the cleanout for all changes within that 40 feet of developed length of pipe. 4. Cleanouts must be provided at intervals within the building sewer from the structure to the tank of not more than 100 feet. The effluent pipe between the septic tank and soil treatment area is exempt from this requirement Sec. 30-9-60. Distribution Box. A. A distribution box, if used, must be of sufficient size to distribute effluent equally to the laterals of a trench or absorption bed system. The box must be constructed with the inlet invert at least one inch above the level of the outlet inverts. Flow equalizers or similar devices must be used to adjust the flow between laterals. Access to the box must be provided with a manhole riser with access lid at or above grade if the top of the box does not reach final grade. 1. Each lateral shall be connected separately to the distribution box. 2. The distribution box shall be watertight and all pipes shall be grouted or cemented. The box shall be located a minimum of five (5) feet from the septic tank. J 3. The cistribution box must be located outside of the absorption area. Solid wall pipe must be installed from the distribution box until the beginning of the absorption area. 4. In the event that treatment tank effluent is discharged to the distribution box by a pump, a baffle shall be installed in the distribution box. The baffle shall be secured to the bottom of the box, extending vertically to a point level with the crown of the inlet pipe, and shall be perpendicular to the inlet. In lieu of a baffle, the inlet pipe may have a ninety (90) degree bend which diverts effluent downwards into the distribution box. Sec; 30-9-70. Drop ox. In sequential or serial distribution, a watertight box may be used to transfer the effluent to the following trench when the effluent in a trench has received the designed level for overflow to the next trench. A drop box shall have a riser at or above final grade, if the top of the drop box does not reach final grade. Outlet pipes in sequential distribution must be designed and installed so that they may be capped off for resting periods. Sec. 30-9-80. Stepdown/Relief Pipe. In sequential or serial distribution, an unperforated pipe may be used to transfer the effluent to the following trench when the effluent in a trench has received the designed level for overflow from that trench. Sec. 30-9-90. Wastewater Pumping and Dosing Siphon Systems. A. Pumps. 1, Non -clog pump opening must have at least two-inch diameter solids handling capacity where raw wastewater is pumped. A pump opening must not have more than 3/4 -inch diameter solids handling capacity if previously settled effluent is pumped. 2. Pumps must be certified to the applicable UL or CSA electrical safety standard, bear the seal of approval of CSA, UL or an equivalent testing program and be constructed of corrosion resistant materials. 3. Grinder pumps must also be certified to NSF/ANSI Standard 46 and bear the seal of approval of the NSF or equivalent testing and certification program. B. Floats and Switches. 1 Automatic liquid level controls must be provided to start and shut off pumps at a frequency or level specified in the design. 2. Floats must be mounted on a stem separate from the pump discharge piping to allow for removal, adjustment, and replacement of the float from grade without removing the pump. 3. Float switches must be certified to the applicable UL or CSA electrical safety standard, bear the seal of approval of CSA, UL or an equivalent certification program and be constructed of corrosion resistant materials. 4. Dosing siphons for pressure dosing and higher level treatment systems must provide for a means of determining the number of dosing events. C Location of Pump or Siphon. 1. A pump or a siphon may be installed in a separate tank following the septic tank. The tank must be of sufficient volume to allow pump or siphon cycling commensurate with the design capacity. 2. The second compartment of a two -compartment septic tank may only be used as the pump tank when the tank is specifically designed for this purpose and it can be demonstrated to the satisfaction of the Division that the minimum 48 -hour detention time will not be decreased. The pump must be screened or provided with an approved filtering device to assure that only liquid effluent will be discharged. The transfer of liquid from the first to the second compartment must be at an elevation that is between the inlet and outlet invert elevations, and through a standard tee designed and located as per the requirements of section 30-9-20,D.4. Siphons must not be installed in the second compartment of a two compartment tank. 3.The use of a three -compartment septic tank, sized to provide the required effective volume in the first two compartments with the pump or siphon in the third compartment is acceptable for tanks specifically designed for this purpose. The transfer of liquid from the second to the third compartment must be at an elevation that is between the inlet and outlet invert elevation, and through a standard tee designed and located as per the requirements of section 30-9-20.D.4. D. Pump or Siphon Discharge Piping. 1. The discharge pipe from the pumping or siphon chamber must be protected from freezing by burying the pipe below frost level or sloping the pipe to allow it to be self - draining. Drainage must be provided through the bottom of the pump or through a weep hole located in the discharge pipe prior to exiting the tank. 2. The pump discharge piping must have a quick disconnect that is accessible from grade to allow for easy pump access and removal. 3. The pipe must be sized to maintain a velocity of two or more feet per second. 4. Pressure pipes must be designed to prevent air or vacuum locking and allow self draining of the pipes. E. Access. 1. The pump or dosing system tank, chamber, or compartment must have a minimum 24 -inch diameter access riser, made of corrosion -resistant material, extending to or above ground level. A smaller diameter riser may only be installed if it is accepted by the Water Quality Control Division as an integral component of a specific product during the product review process. 2. The access riser must have a watertight connection to the pump or dosing chamber/compartment to prevent infiltration or exfiltration. All other intrusions to the riser for electrical or other component access must also be watertight. F. Splice Box. 1. Splice boxes must be located outside the pump system access riser and be accessible from the ground surface. 2. Wire splices are prohibited inside the tank, dosing chamber or riser. Wire splicing must be completed with corrosion -resistant, watertight connectors. G. Controls. 1. Control panels or other electrical boxes used to control the functions of an OWTS must comply with the following, as appropriate: a. The pump system must have an audible and visual alarm notification in the event an excessively high water condition occurs. b. The pump must be connected to a control breaker separate from the high water alarm breaker and from any other control system circuits. An electrical disconnect must be provided within the line of sight of the pump chamber. c. The pump system must be provided with a means that will allow the pump to be manually operated. d. The pump system for pressure dosing and higher level treatment systems must have a mechanism for tracking both the amount of time the pump runs and the number of cycles the pump operates. e. Must bear the seal of a Nationally Recognized Testing Laboratory (NRTL), such as UL or ETL. Sec. 30-9-100. Effluent Screens. A. If a pump or dosing siphon is used to remove septic tank effluent from the final compartment of the septic tank, the effluent must be filtered prior to dispersal into the soil treatment area. An effluent screen, pump vault equipped with a filter cartridge, or a filter on the discharge pipe, would all be considered acceptable. B. The effluent screen, if used, must be cleaned at manufacturer recommended intervals, or more often, if use patterns indicate. C. An alarm may be installed on an effluent screen indicating need for maintenance. D. Where an ejector pump, grinder pump or non -clog pump is proposed for use prior to the septic tank, an effluent screen must be installed on the outlet of the septic tank. E. The handle of the effluent screen must extend to within 12 inches of grade. Sec. 30-9-110. Grease Interceptor Tanks. A. All commercial food service facilities and other facilities generating fats, oils and greases in their waste must install a grease interceptor tank. B. Grease interceptor tanks shall treat only those portions of the total wastewater flow in which grease and oils are generated. C. The grease interceptor must have a minimum of two compartments and must be sized proportionate to the amount of fats, oils and grease it receives, the peak flow rate through the tank, and the expected cleaning frequency. D. The inlet and outlet tees or baffles must extend into the bottom 1/3 of the liquid volume, but must be at least 12 inches off the inside floor of the interceptor. E. The inlet and outlet tees or baffles must extend at least 5 inches above the liquid level and must provide for a free vent area across the liquid surface. ARTICLE X DESIGN CRITERIA — SOIL TREATMENT AREA Sec. 30-10-10. Soil Treatment Area General. A. The size and design of the soil treatment area must be based on the results of the site and soil evaluation, design criteria, and construction standards for the proposed site and OWTS selected. B. At proposed soil treatment area locations where any of the following conditions are present, the system must be designed by a professional engineer and approved by the Division: 1. For soil types , 3A, 4, 4A, 5, R-0, R-1 and R-2, as specified in Table 30-10-1 and 30- 10-1A of this Regulation; 2. The maximum seasonal level of the ground water surface is less than four feet below the bottom of the proposed infiltrative surface; 3. A limiting layer exists less than four feet below the bottom of the proposed infiltrative surface; 4. The ground slope is in excess of thirty percent; or 5. Pressure distribution is used. Sec. 30-10-20. Calculation of Infiltrative Surface of Soil Treatment Area. A. The infiltrative surface of a trench or bed receiving any treatment level of effluent is only the bottom area. No sidewall credit is allowed except in deep gravel trenches that are permissible in repairs. B. Long-term acceptance rates (LTARs) are shown in Table 30-10-1 and 30-10-1A. C. Factors for adjusting the size of the soil treatment area are in Tables 30-10-2 and 30-10- 3. D. The required area for a soil treatment area is determined by the following formula: Soil Treatment Area in square feet required = Design Flow (in gallons per day) LIAR (in gallons per day per square foot) 1. Adjusted Soil Treatment Area = Required Soil Treatment Area x Size Adjustment Factor(s). 2. Size adjustment factors for methods of application are in Table 30-10-2. 3. Size adjustment factors for types of distribution media are in Table 30-10-3. 4. A required soil treatment area may be multiplied by one size adjustment factor from Table 30-10-2, Table 30-10-3, or both. 5. A soil treatment area receiving TL2, TL2N, TL3, or TL3N effluent must be pressure dosed. Long Term Acceptance Rate (LTAR); Gallons per day per square foot All Treatment Levels >35% Rock (>2mm): See Table 30- 10-1A co d Co o U) a co o M 0 N 0 r 0 — 0 Soil Type, Texture, Structure and Percolation Rate Range Percolation Rate (MPI) >35% Rock (>2mm): See Table 30-10-1A N- 6 6 N co (Q N CD r ; in (D N I. 0 N O) + N USDA Soil Structure - Grade >35% Rock (>2mm): See Table 30-10-1A 0 (Structureless) 2 (Moderate) 3 (Strong) 1 (Weak) 0 (Structureless) N 1 0 (Structureless) N 1 0 (Structureless) Co N USDA Soil Structure -Type >35% Rock (>2mm): See Table 30-10-1A Single Grain PR (Prismatic) BK (Blocky) GR (Granular) PR, BK, GR Massive PR, BK, GR PR, BK, GR Massive PR, BK, GR PR, BK, GR Massive USDA Soil Texture >35% Rock (>2mm): See Table 30-10-1A Sand, Loamy Sand Sandy Loam, Loam, Silt Loam Sandy Loam, Loam, Silt Loam Sandy Clay Loam, Clay Loam, Silty Clay Loam Sandy Clay Loam, Clay Loam, Silty Clay Loam Sandy Clay, Clay, Silty Clay Sandy Clay, Clay, Silty Clay Soil Types 2-4A Soil Type ix r (N N CIM . in c (.Q W O o ORD2013-13 Table 30-10-1A Design Criteria for Soils with High Rock Content (Type "R" Soils) 1,2,3,4 Soil Type, Percentage of Rock, LTAR, Distribution Required Sand or Media Depth Relative to the Quality of Effluent Applied to the Distribution System Treatment Level 16 Minimum 3 -foot deep , Unlined Sand Filter Minimum 2 -foot deep Unlined Sand Filter Remove, mix, replace 4 feet of existing material; with a maximum LTAR Minimum 3 -foot deep Unlined Sand Filter Type of Distribution Required Pressure Distribution8 Pressure Distribution8 Pressure Distribution8 Timed, Pressure Distribution8 Maximum LTAR (gal/sq. ft./day Unlined Sand Filter: 1.0 for "Preferred Sand Media:, 0.8 for "Secondary Sand Media" Use TL1 LIAR from Table 30-10-1 for the soil type corresponding to the soil matrix with a maximum LTAR of 0.8 The allowable LTAR's are defined in each individual treatment level column in this table Use TL1 LTAR from Table 30-10-1 for the soil type corresponding to the soil matrix, with a maximum LTAR of 0.8 Percentage and Size of Rocks R-0 I Soil Type 1 with more than 35% Rock (>2mm) R-1; Option 1 Soil Type 2-5, >35%- 65% Rock (>2mm); With >50% of the Rock <20 mm (3/4 inch) R-1; Option 2 Soil Type 2 and 2A, >35%-65% Rock (>2mm); With >50% of the Rock <20 mm (3/4 inch) Soil Type 2-5, >65% Rock (>2mm), OR >50% of Rock >20mm (3/4 inch) Soil Type N OC Lo (0 W O Q 0 * M i ..L - CO M N- r N O N O ct 1 General guidance for Table 30-10-1A: The intent of the soil type R-0 is to define a material that consists of a high percentage of rock, or rock fragments, and has a percolation rate of less than 5 mpi. Soil types R-1 and R-2 consist of a high percentage of rock or rock fragments, but have a percolation rate of greater than 5 mpi Soil types R-0 and R-2 are considered to be a "limiting layer". 2 No sizing adjustments are allowed for systems placed in type "R" soils. The maximum LTAR's are provided in this table 3. The design of type "R" soil treatment systems must conform to sections 30-11-30.B and C. 4. All systems installed in a type "R" soil must be designed by a professional engineer. 5. The percentage of rock may be determined by a gradation conducted per ASTM standards, or an appropriate field evaluation by volume. 6. Type "R" soil treatment systems that are designed per the criteria noted in the Treatment Level 1 column of this table do not require 0/M oversight by the LPHA. 7. The "Percentage and Size of Rock" column references the soil types noted in Table 30-10-1. 8. Design of the pressure distribution system for type "R" soils shall comply with the requirements of sections 30- 11-30 B. 2. a, b, c, d, and e. Sec. 30-10-30. Allowable Soil Treatment Area Sizing Adjustments. A. The soil treatment area size determined by dividing the design flow rate by the long-term acceptance rate may be adjusted by factors for soil treatment area design and type of distribution media. B. For the purpose of the table, a "baseline system," i.e. adjustment factor of 1.O0, is considered to be Treatment Level 1 (TL1) applied by gravity to a gravel -filled trench. Table 30-10-2 Size Adjustment Factors for Methods of Application in Soil Treatment Areas Type of Soil Treatment Area Method of Effluent Application from Treatment Unit Preceding Soil Treatment Area Gravity Dosed (Siphon or Pump) Pressure Dosed Trench 1.0 0.9 0.8 Bed 1.2 1.1 1.0 Table 30-10-3 Size Adjustment Factors for Types of Distribution Media in Soil Treatment Areas Type of Soil Treatment Area Type of Storage/Distribution Media Used in Soil Treatment Area Category 1 Category 2 Category 3 Rock or Tire Chips Other Manufactured Media Chambers or Enhanced Manufactured Media Trench or Bed 1.0 0.9 0.7 1. All proprietary distribution products must receive acceptance and the applicable reduction through Colorado Water Quality Control Division review per the applicable requirements of Regulation 43 section 43.13. Sec. 30-10-40. Design of Distribution Systems. A. General 1. The infiltrative surface and distribution laterals must be level. 2. The infiltrative surface must be no deeper than four feet below grade unless. The depth of the infiltrative surface will be measured on the up -slope side of the trench or bed. 3. Trenches must follow the ground surface contours so variations in infiltrative surface depth are minimized. Beds must be oriented along contours to the degree possible. 4. Pipe for gravity distribution must be no less than three inches in diameter 5. A final cover of soil suitable for vegetation at least ten inches deep must be placed from the top of the geotextile or similar pervious material in a rock and pipe system, chamber, or manufactured media up to the final surface grade of the soil treatment area. 6. Following construction, the ground surface must be graded to divert stormwater runoff or other outside water from the soil treatment area. The area must be protected against erosion. Subsurface drains upslope of the soil treatment area may be installed to divert subsurface flow around the area. Subsurface drains must meet the minimum horizontal separation distances from components of the OWTS as specified in Table 30-7-1. 7. Backfilling and compaction of soil treatment areas must be accomplished in a manner that does not impair the intended function and performance of the storage/distribution media and soil and distribution laterals, allows for the establishment of vegetative cover, minimizes settlement and maintains proper drainage. 8. Dosing may be used for soil treatment area distribution. The dose must be sized to account for the daily flow and the dosing frequency. B. Distribution Laterals; Must meet the requirements of section 30-9-40 as applicable. 1. Distribution between laterals in a soil treatment area must be as level as possible. Uneven settling of portions of the distribution system following construction must be addressed by provisions in the design to adjust flows between laterals. 2. The maximum length of distribution laterals must not exceed 150 feet. 3. Distribution laterals longer than 100 feet must be pressure dosed or the application of the effluent must be at the center of the lateral through a distribution box. 4. For absorption beds, the separating distance between parallel gravity distribution laterals must not exceed six feet (center -to -center), and a distribution lateral must be located within three feet of each sidewall and endwall. 5. The end of a distribution pipe must be capped, unless it is in a bed or trenches in a level soil treatment area, where the ends of the lines may be looped. 6. To promote equal distribution to the soil treatment area, the forcemain or effluent pipe must be connected to as near to the middle of the distribution header as possible. However it must be offset from any distribution lateral to prevent preferential flow. 7. Orifices must be oriented downward unless pressure distribution is used and provision for pipe drainage is included. C. Pressure Distribution 1. Design of pressure distribution systems must include: a. Dose size and frequency for either proposed flows and soil type, or media long- term acceptance rate; b. Pipe diameter and strength requirements; c. Orifice size and spacing; d. A 30 — 72 inch operating head at the distal end orifice; e. Pump/siphon information; Total Dynamic Head; gallons/minute; f. Drain -back volume from forcemain; and g. Calculations, or a design software reference, that indicates the selected component sizing will provide equal flow within each active zone of the distribution system, and provide no more than a 10% flow differential from the initial orifice to the most distal end orifice within each zone. 2. The separating distance between parallel distribution pipes in a pressure distribution absorption bed must not exceed four feet, and the outer distribution pipe must be located within two feet of each sidewall and endwall. Specific requirements for the design of sand filters are noted in section 30-11-30.B. 3. Flushing assemblies must be installed at the distal end of each lateral and be accessible from finished grade. A sweeping 90 degree or bends limited to 45 degree must be provided. Sec. 30-10-50 Soil Treatment Area Requirements A. Trenches. 1. Trenches must be three feet wide or less. 2. The separating distance between trenches must be a minimum of four feet sidewall-to-sidewall. 3. Distribution laterals used in a trench must be as close to the center of the trench as possible. B. Beds. 1. Maximum width for a bed shall be 12 feet, unless the bed receives effluent meeting Treatment Level 2 quality or better. 2. The separation distance between beds must be a minimum of six feet sidewall-to- sidewall. C. Serial and Sequential Distribution: 1. A serial or sequential distribution system may be used where the ground slope does not allow for suitable installation of a single level soil treatment area unless a distribution box or dosing chamber is used. 2. The horizontal distance from the side of the absorption system to the surface of the ground on a slope must be adequate to prevent lateral flow and surfacing. 3. Adjacent trenches or beds must be connected with a stepdown/relief pipe or a drop box arrangement such that each trench fills with effluent to the top of the gravel or chamber outlet before flowing to succeeding treatment areas. D. Alternating Systems. 1. An alternating system must have two or more zones that must be alternated on an annual or more frequent basis. 2. For repairs, each section must be a minimum of 50 percent of the total required soil treatment area. For new installations, each separate soil treatment area must meet the minimum sizing requirements of this regulation. 3. A diversion valve or other approved diversion mechanism that requires the owner or operator to manually alternate zones of the OWTS may be installed on the septic tank effluent line allowing soil treatment area sections to be alternated. 4. The diversion mechanism must be readily accessible from the finished grade E. Sequencing Zone Systems. 1. Sequencing zone systems have two or more soil treatment area sections that are dosed on a frequent rotating basis. 2. Where soil conditions are similar between the sections, each section area must be the same size. If soil conditions are such that long-term acceptance rates are different, each section may be sized for the same dose, but different long-term acceptance rates. 3. An automatic distribution valve must be used. 4. Dosing of each system must be evaluated by the design engineer based on projected daily flow rates, number of zones, and soil types. F. Inspection Ports 1. A 4 -inch inspection port accessible from ground surface must be installed at the terminal end of each lateral in a trench system and at each corner of a bed system. The bottom of the inspection port tube must extend to the infiltrative surface and not be connected to the end of the distribution pipe. 2. Inspection ports in chambers may be installed according to manufacturer's instructions if the infiltrative surface is visible and effluent levels can be observed from the inspection port. 3. Additional inspection ports connected to distribution pipes may be installed. 4. The top of the inspection ports may be terminated below the final grade if each is housed in a component such as a valve box for a lawn irrigation system and has a removable cover at the ground surface. 30-10-60 Storage/Distribution Media A. Rock and Pipe 1. The perforated pipe must be surrounded by clean, graded gravel, rock, or other material of equal efficiency which may range in size from 1/2 inch to 2 1/2 inches. AASHTO M 43 size No. 3 coarse aggregate meets this specification. 2. At least six inches of gravel, rock or other material must be placed below the pipe. The gravel, rock or other material must fill around the pipe and be at least two inches above the top of the distribution pipe. 3. The top of the placed gravel or such material used must be covered with non -woven permeable geotextile meeting a maximum thickness rating of 2.0 ounces per square yard or equivalent pervious material. An impervious covering must not be used. B. Chambers 1. Chambers must be installed with the base of the unit on in -situ soil or, if placed on acceptable media, the manufacturer's installation instructions must be followed so as to prevent chambers from settling into the media. 2. Installation must be according to manufacturer's instructions. 3. Effluent may be distributed by gravity, pump or siphon. 4. If the width of a proprietary manufactured distribution product is within 90 percent of the width of the excavation, it may be approved as being equivalent to the full width of the excavation, if information is provided that demonstrates distribution of the full width. Thus, the product must cover at least 90 percent of the excavated area in either a trench or bed configuration in order to receive sizing adjustments provided in Table 30-10-3. C. Media, Enhanced, or Other Manufactured 1. Manufactured media must be installed with the base on the in -situ soil or placed on acceptable media meeting the manufacturer's specifications for proprietary distribution products or combined treatment/distribution products. 2. Installation must be according to manufacturer's instructions. 3. Pressure distribution is required for TL2-TL3N effluent, unless otherwise noted in this regulation. D. Driplines 1. The infiltrative surface area must be calculated using the long-term acceptance rate for the site or a more conservative value if recommended by the manufacturer. 2. Driplines must be installed on manufacturer's spacing recommendations. 3. Drainback must be provided for all drip lines, pipes and pumps. 4. Provisions must be made to minimize freezing in the distribution pipes, driplines, relief valves, and control systems. 5. Provisions must be made for filtering, back -flushing, or other cleaning. E. Tire Chips 1. The pipe may be surrounded with clean, uniformly -sized tire chips. 2. Tire chips must be nominally two inches in size and may range from 1/2 inch to a maximum of four inches in any one direction. 3. Wire strands must not protrude from the tire chips more than 0.75 inches. 4. Tire chips must be free from balls of wire and fine particles less than two mm across. 5. The top of the tire chips used must be covered with non -woven permeable geotextile meeting a maximum thickness rating of 2.0 ounces per square yard or equivalent pervious material. An impervious covering must not be used. Sec. 30-10-70. Lift Stations. Lift stations intended solely for the purpose of delivering sewage to a septic tank or septic tank effluent to a standard soil treatment area that is located such that it is not possible to provide gravity flow from the septic tank to the soil treatment area are not required to be designed by a professional engineer. The systems installer shall submit to the Division a pump information form, provided by the Division, for documentation. Sec. 30-10-80. Soil Replacement. A. The construction of a soil replacement system is permitted to bring the soil treatment area into compliance with the requirements of this regulation 1. When a soil type "R" is removed, the following requirements must be met: a. All added soil must comply with the following specifications: (1) Added soil must meet the specifications of either "preferred" or "secondary" sand filter media, as specified in section 30-11-30 B.4. (2) The long-term applicable rates as specified in Table 30-10-1A must be used. No additional sizing adjustments are allowed. (3) The depth of the added media must comply with the requirements of Table 30-10-1A. (4) A gradation of the sand media used must be provided. The gradation must be dated no more than one month prior to the installation date. However, a gradation of the actual material placed in the excavation is recommended. (5) All added soil must be completely settled prior to installation of components as specified and approved by the design engineer. (6) Pressure distribution must be used. 2. The removal and reinstallation of in -situ soil may only be allowed where the soils are determined to be a soil type "R-1" (Option 2). The design must comply with the requirements for this soil type noted in Table 30-10-1A (Soil Type R-1, Option 2). 3. When a sand media is added to soil treatment area or to an excavation where a soil type 1-5 (Table 30-10-1) is the underlying soil, the following requirements must be met: a. Added soil must meet the specifications of either "preferred" or "secondary" sand filter media, as specified in section 30-11-30 B.4. b. Unless the design follows the criteria for a sand filter or mound system design as required in section 30-11-30, the TL1 long-term acceptance rate for the receiving soil must be used. c. A gradation of the sand media used must be provided. The gradation must be dated no more than one month prior to the installation date. However, a gradation of the actual material placed in the excavation is recommended. d. All added soil must be completely settled prior to installation of components. Sec. 30-10-90. Repairs. A. When space is not available or if there are other site limitations that preclude other soil treatment area options for OWTS repairs, wide beds, deep beds and deep gravel trenches may be considered for repairs only. Other options are vaults (in accordance with Section 30-12-40) or higher level treatment systems. B. Repairs to failing systems must conform to setbacks identified in Table 30-7-1 when possible. When this is not possible using all available methods described above, the jurisdiction with authority may permit reductions to setbacks. At no point will a setback reduction be approved by the jurisdiction less than what the existing separation is to existing OWTS. In maximizing this setback distance, all methods available in section 30- 10-90 A. must be utilized including but not limited to the use of Higher Level Treatment, wide beds, etc., where allowed. Any setback reduction beyond what the existing failing system presents must be approved by the local board of health as outlined in section 30- 4-140. C. Wide Beds: For repairs, beds may be wider than 12 feet without being required to receive effluent meeting Treatment Level 2 quality or better. E. Deep Beds: For repairs, the infiltrative surface of a bed may be no deeper than five feet. Size adjustments as provided for in Tables 30-10-2 and 30-10-3 must not be applied. System sizing will be based strictly on the soil type and corresponding LTAR. F. Deep Gravel Trenches. 1. The length of an absorption trench may be calculated by allowance for the sidewall area of additional depth of gravel in excess of six inches below the bottom of the distribution pipe according to the following formula: Adjusted Length = L x (W+2) (W+1 +2D) Where: L = length of trench prior to adjustment for deep gravel W = width of trench in feet D = additional depth in feet of gravel in excess of the minimum required six inches of gravel below the distribution pipe 2. Maximum allowable additional depth is five feet. 3. Percolation tests or soil profile test pit excavations must be performed at the proposed infiltrative surface depth. 4. Size adjustments as provided for in Table 30-10-2 3n and GI IV V V deep gravel trenches. G. Wastewater Ponds 1. Construction of new wastewater ponds is prohibited. 1 In 3 1 i L I L be appii€d tir 2. For repairs of an existing wastewater pond, the potential for risk to public health and water quality may be evaluated by the local public health agency. If risk is low in the determination of the local public health agency, the repair of a wastewater pond may be permitted, however the following criteria must be followed: a. A septic tank must precede the wastewater pond. b. The depth of the design volume of the wastewater pond must be at least five feet. c. A wastewater pond must have two feet of free board above the design volume of the pond. d. A wastewater pond must be fenced to keep out livestock, pets, vermin, and unauthorized people. e. Wastewater ponds must be designed on the basis of monthly water balance including design flow, precipitation, evaporation, and seepage. f. Wastewater ponds must be constructed so the seepage out of the bottom or sides does not exceed 1/32 of an inch per day. If this limit cannot be achieved using compacted natural soil materials including soil additives, an impermeable synthetic membrane liner must be used. g. If the evapotranspiration does not exceed the rate of inflow of effluent from the structure, a soil treatment area meeting the requirements of this regulation must be installed to accept the excess flow. h. Maintenance must include preventing aquatic and wetland plants from growing in or on the edge of the pond, protecting sides from erosion, and mowing grasses on the berm and around the pond. i. Wastewater ponds must be designed by a professional engineer. G. Vaults. 1. The allowable use of vaults for repairs must meet the criteria specified in Section 30- 12-20 of this Regulation. H. Higher Level Treatment Options. 1. Design criteria for higher level treatment systems are in Article XI. ARTICLE XI DESIGN CRITERIA — HIGH LEVEL TREATMENT SYSTEMS Sec. 30-11-10. General. A. Higher level treatment systems must be designed by a professional engineer. B. Higher level treatment systems may be public domain technology systems or proprietary systems. 1. Public domain technology systems must be designed, installed and maintained according to established criteria. When design criteria are not specifically provided in this Regulation, the criteria used in the design must be from a reference commonly used as an industry standard and the criteria must be cited in the design. 2. Proprietary systems must be designed, installed, and maintained according to manufacturer's instructions and must have received review and acceptance by the Water Quality Control Division. C. Soil treatment areas for higher level treatment systems must be pressure dosed. D. Systems must be capable of accommodating all anticipated flows and organic loads. E. Ventilation and air systems: Mechanical components must be installed in a properly vented location and all vents, air intakes, and air hoses must be protected from snow, ice, or water vapor accumulations. F. Covers, barriers, or other protection: All systems must be installed to include protection of openings against entry of insects, rodents, other vectors and unauthorized people. Sec. 30-11-20. Treatment Levels. The treatment levels identified in Table 30-6-3 are specified in this Section for public domain technology, and proprietary treatment systems will be assigned a treatment level approved by the Water Quality Control Division. Adequate maintenance and operation plan as required by the Water Quality Control Division must be submitted to the Division. Sec. 30-11-30. Sand Filters. A. A lined or unlined intermittent sand filter, or recirculating sand filter, may be used as a higher level -treatment system prior to dispersing the effluent into a soil treatment area. B. Intermittent (Single Pass) Sand Filters; General Requirements 1. The treatment level for intermittent sand filters is considered TL3. 2. General Design Parameters: Not all combinations of the variables noted below will result in a proper distribution system design. The design engineer must justify through calculations or design software that the selected values will concur with industry standards. a. Distribution pipe size: 3/4 inch — 1.5 inches (PVC Class 200, min.) (1) 2 inch distribution pipe may only be used where other design modifications cannot overcome a greater than 10% variation in the pressure head between the initial and distal orifices. (2) Distribution pipe spacing: 18 inches — 48 inches (3) Orifice size: 1/8 inches — 3/8 inches (Also see section 30-11-30 E.1. below) (4) Orifice spacing: 18 inches — 48 inches (5) Operating head at the distal end of distribution pipes: 30 inches — 72 inches (60 inches typ.). Larger orifices allow for an operating head at the lower end of this range, while smaller orifices will necessitate an operating head at the higher end of this range. 3. Dosing= a. Pressure distribution is required. The design of the distribution system must also comply with the requirements of 30-10-40 C.1. b. Number of cycles/day: Will vary with design (Short, frequent doses are preferred.) c. Proposed dose volume: Will vary with design (0.25 — 1.0) gallons/orifice/dose, or 3-5 times distribution pipe volume d. Timed dosing is recommended where design considerations allow, 4. Sand Filter Treatment Media a. The depth of the sand media below the distribution system must be at least 24 inches unless otherwise noted in Table 30-10-1A for type "R" soils. b. "Preferred" sand media requirements: (i) Effective size: 0.25-0.60 mm (ii) Uniformity coefficient: 5 4.0 (iii) Percent fines passing #200 sieve: ≤ 3.0 c. "Secondary" sand media requirements: (i) Effective size: 0.15-0.60 mm (ii) Uniformity coefficient: ≤7.0 (iii) Percent fines passing #200 sieve: ≤ 3.0 d. A gradation of the sand media used must be provided. The gradation must be dated no more than one month prior to the installation date. However, a gradation of the actual material placed in the excavation is recommended. 5. Gravel Requirements a. Clean, graded gravel, or rock, must range in size from 1/2 inch to 2 1/2 inches. AASHTO M 43 size No.3 coarse aggregate meets this specification. (i) The gravel must surround the distribution pipes used to disperse the effluent and must be at least 6 inches below and 2 inches above the pipes. (ii) Water Quality Control Division accepted manufactured media may be used as an alternative to specified gravel. 6. Filter Fabric Requirements a. The top layer of gravel must be covered with a non -woven permeable geotextile fabric meeting a maximum thickness rating of 2.0 ounces per square yard or equivalent pervious material. 7. Final Cover Material a. 8 inches — 10 inches of Type 1 or 2 soil with an additional 2 inches top soil 8. Size adjustment factors provided in Tables 30-10-2 and 30-10-3 are not applicable for sand filters. 9. Sand filters must not be used to treat wastewater that does not conform to TL.1 treatment level or better. C. Unlined (Open Bottom) Sand Filters. 1. All requirements for 30-11-30 B. 1-9 will apply to unlined sand filters. 2. Application rates: a. Maximum hydraulic loading rate for TL1 effluent applied to "Preferred Sand Media" in an unlined sand filter is 1.0 gal./sq.ft./day, or the long- term acceptance rate of the receiving soil for TL1 (Table 10-1) whichever results in the larger area. b. Maximum hydraulic loading rate for TL1 effluent applied to "Secondary Sand Media" in an unlined sand filter is 0.8 gal./sq.ft./day, or the long term acceptance rate of the receiving soil for TL1 (Table 10-1) whichever results in the larger area. c. Maximum hydraulic loading rate for TL2, TL2N, TL3, or TL3N effluent applied to "Preferred" or "Secondary" Sand Media in an unlined sand filter must be the long- term acceptance rate of the receiving soil for TL1, (Table 10-1). 3. The upper infiltrative surface of an unlined sand filter receiving TL1 — TL3N effluent must be at least three feet above a limiting layer. D. Lined Sand Filters 1. All requirements of 30-11-30 B.1-9 will apply to unlined sand filters. 2. Application rates: a. Hydraulic loading rate for TL1 effluent applied to "Preferred Sand Media" in a lined sand filter is 1.0 gal./sq.ft./day. b. Hydraulic loading rate for TL1 effluent applied to "Secondary Sand Media" in a lined sand filter is 0.8 gal.fsq.ft,/day. 3. The minimum depth of the sand media in a lined sand filter must be two feet. 4. An intermediate layer of pea gravel, two inches in thickness, must be placed between the sand filter media and the course under -drain media to prevent the migration of sand into the lower layer of under -drain gravel. ASTM C 33, No. 8, coarse aggregate meets this specification. 5. A minimum four -inch diameter slotted SCH40 PVC under -drain pipe must be used to collect the treated effluent. The under -drain pipe must be installed in the center of a 5 inches thick bed of washed, graded gravel, or rock ranging in size from 1/2 inch to 2 1/2 inches. AASHTO M 43, No.3 coarse aggregate meets this specification. 1. Lined sand filters must have an impervious liner on the sides and bottom of the filter. The liner must consist of a minimum 30 mil thick PVC material or equivalent. 6. Effluent collected by the under -drain must be dispersed to a soil treatment area. The soil treatment area may be sized with a maximum long-term acceptance rate of the receiving soil for TL1 effluent. E. Recirculating Sand Filter, Minimum Requirements: 1. Treatment level: a. Treatment level provided within recirculating sand filters is TL3. (i) General Design Parameters: Not all combinations of the variables noted below will result in a proper distribution system design. Engineer must justify through calculations or design software that the selected values will concur with industry standards. b. Distribution pipe size: 3/4 inch — 2 inches (PVC Class 200, min.) c. Distribution pipe spacing: 18 inches — 36 inches (24 inches typ.) d. Orifice size: 1/8 inch — 1/4 inch e. Orifice spacing: 18 inches — 36 inches (24 inches typ.) f. Pressure head at end of distribution pipe: 24 inches — 72 inches (60 inches typ.) 2. Dosing: a. Timed dosed, pressure distribution is required. The design of the distribution system must comply with the requirements of section 30-10-40 C.1. b. Recirculation ratio: 3:1 — 5:1 c. Gallons/orifice/dose: 1 — 3 (2.0 typ.) d. Hydraulic loading: 3 - 5 galisq.ft./day (4 — 5 typ.) e. Dosing time "ON"; <2.5 min. (<2.0 typ.) f. Number of cycles/day: 48 — 120 3. Top gravel requirements: a. Washed, graded gravel, or rock, must range in size from 1/2 inch to 2 1/2 inches. AASHTO M 43, No.3 coarse aggregate meets this specification. b. The gravel must surround the distribution pipes used to disperse the effluent and must be at least 6 inches below and 2 inches above the pipes. c. State accepted manufactured media may be used as an alternative to specified gravel. d. Soil cover is prohibited. The upper gravel layer must be open to the atmosphere. 4. Filter media requirements: a. Effective size: 1.5 — 2.5 mm b. Uniformity coefficient: 5 3 c. Fines passing #200 sieve: s 1.0 d. Media depth (min.): 24 inches 5. Intermediate gravel layer: a. An intermediate layer of pea gravel, two inches in thickness, must be placed between the coarse underdrain media and the sand filter media to prevent the migration of sand into the lower layer of under -drain gravel (ASTM C 33, No. 8, coarse aggregate). 6. Under -drain requirements: A minimum four inch diameter slotted SCH40 PVC under -drain pipe must be used to collect the treated effluent. The under -drain pipe must be installed in the center of a 5 inches thick bed of washed, graded gravel, or rock ranging in size from 1/2 inch to 2 1/2 inches, AASHTO M 43, No.3 coarse aggregate meets this specification. 7. PVC liner requirements: a. Lined sand filters must have an impervious liner on the sides and bottom of the filter. The liner must consist of a 30 mil thickness PVC material or equivalent. b. Effluent collected from the recirculating sand filter must be discharged to a soil treatment area. The soil treatment area may be sized with a maximum long-term acceptance rate of the receiving soil for TL1 effluent. 30-11-40 Mound Systems A. When the infiltrative surface area of the media receiving wastewater effluent is at or above the natural ground surface at any point, it shall be considered a mound system. B. Mound systems that provide a minimum of 24 inches of sand treatment media may use the application rates for the in -situ receiving soil for TL1 effluent (Table 10-1). Size adjustment factors within Table 30-10-3 may be applied if TL1 application rates are used. C. Mound systems must conform to the design requirements of sections 30-11-30 C.1-5 for unlined (open bottom) sand filters, with the following exceptions. 1. A mound system may include less than 24 inches of imported sand media on a site where a lesser depth of sand media is sufficient to meet vertical separation requirements above a limiting layer. Application rates for the in -situ receiving soil for TL1 effluent must be used when less than 24 inches of sand media is used, unless higher level treatment is provided prior to dispersal into the mound system. 2. For the design of a mound system where less than 24 inches of sand media is proposed, and application rates for TL1 are used, the size adjustment factors within Table 30-10-3 may be used. D. The basal area must be determined using the LTAR from Table 30-10-1 for the in -situ receiving soil under the mound. E. Linear loading rates must be determined. The evaluation of many factors is required for an accurate determination of the linear loading rate. While application rates for the in -situ receiving soil under the mound is a main component, placement on the slope, and percent of slope must also be addressed when defining the linear loading rate. If the movement of the effluent is primarily vertical, then the linear loading rate is not as critical. However, if the movement of the effluent will be primarily horizontal, as would be expected in soil types 3A through 5 (Table 30-10-1), then the linear loading rate is extremely important and long narrow mounds are strongly recommended. 1. When TL1 effluent is applied to the distribution media of a mound system installed above in -situ soil types 1 through 3 (Table 30-10-1) and R-0 through R-2 (Table 30- 10-1A), the suggested linear loading rate is between 6 gpd/lin.ft. and 12 gpd/lin.ft. The maximum width of the distribution media in a mound system installed above these soil types is 12 feet when TL1 effluent is applied to the distribution media of a mound system. 2. When TL2 through 3N effluent is applied to the distribution media of a mound system installed above in -situ soil types 1 through 3 (Table 30-10-1) and R-0 through R-2 (Table 30-10-1A), the linear loading rate may exceed 12 gpd/lin.ft.; subsequently the mound may be wider than 12 feet. 3. When TL1 through TL3N effluent is applied to mound systems installed above in -situ soil types 3A through 5 (Table 30-10-1), the suggested linear loading rate is between 3 gpd/lin.ft. and 5 gpd/lin.ft. The maximum width of the distribution media in a mound system placed above these soil types is 12 feet. F. The final cover over a mound system must extend at least twelve inches horizontally beyond the perimeter of the distribution media prior to sloping down to existing grade. The final slope of the mound must be no greater than three feet horizontal to one foot vertical. G. The surface of the mounded area must be planted with a suitable vegetative cover_ H. A suggested reference for the design and installation of mound systems is, "The Wisconsin Mound Soil Absorption System: Siting, Design, and Construction Manual, January 2000". Note that this is suggested guidance, and where the requirements of this regulation differ from those in the referenced mound document, the requirements of this regulation will govern in those cases. Sec. 30-11-50. Rock Plant Filter (Constructed Wetland) Treatment Before a Soil Treatment Area. A. A rock plant filter system must be designed by a professional engineer. B. The design must be site specific and include specifications for: loading, capacity, dimensions, liner material, filter media, effluent depth and depth control mechanism, density and species of plant material, instructions for maintenance and other pertinent information as requested by the Division. C. The treated effluent from a rock plant filter must be distributed to a soil treatment area. D. Although producing higher level treatment, rock plant filters must not be assigned a treatment level higher than TL1 because of system and seasonal variability. ARTICLE XII DESIGN CRITERIA - OTHER FACILITIES Sec. 30-12-10. Evapotranspiration and EvapotranspirationlAbsorption Systems. A. Non -Pressurized Drip Dispersal System (NDDS): 1. An NDDS is considered a type of evapotranspiration/absorption system. However as specific design criteria is provided for an NDDS, they are exempt from the additional requirements of section 30-12-10 B, C and D. 2. The Colorado Professionals in Onsite Wastewater Guidelines for the Design and Installation of Non -Pressurized Drip Dispersal Systems (NODS), September, 2016 is the procedural guideline in the design of a NDDS and must be followed when an NDDS is proposed. 3. The width of an NDDS system may be wider than 12 feet. B. The following section provides general criteria which must be followed when an evapotranspiration or evapotranspiration/absorption bed is proposed. 1. The design may only be permitted in arid climates where the annual evaporation rate exceeds the annual precipitation rate by more than 20 percent, and where site characteristics dictate that conventional methods of effluent dispersal are not appropriate. 2. The design may only be permitted in soil types 4, 4A and 5. 3. The system must be designed by a professional engineer. 4. If data for the Pan Evaporation Rate is provided, it must be multiplied by 0.70, or less, to obtain the equivalent Lake Evaporation Rate. 5. The width of the bed may be wider than 12 feet. 6. The required capillary or wicking sand must meet the gradation requirements in Table 12-1 and be approved by the design engineer. This sand is to be covered by a crowned, thin layer of loamy -sand mix and appropriate vegetation that will assist in drawing the water to the surface. 7. Adjustment factors as provided in Tables 30-10-2 and 30-10-3 must not be used. Table 30-12-1 Gradation of Wicking Sand for Evapotranspiration Beds (Fine Sand) Sieve Size 4 Percent Passing 100 40 50-70 200 <15 C. For systems designed strictly as an evapotranspiration bed, the following criteria must be met: 1. Design data to be furnished must include, but shall not be limited to: system dimensions, distribution system design, specifications of distribution media and wicking sand, liner material if used, bedding, properties of the soil under the system, vegetation cover, and a water balance calculation including annual precipitation and storage requirements for periods of the year when evapotranspiration does not occur. 2. The following formula must be used for determining the minimum area necessary for total evapotranspiration of septic tank effluent: Area (in square feet)* = Design Flow (in gallons per day) x 586 Lake Evaporation Rate at the Site (in inches per year) * Additional area may be required based on the annual water balance calculations. 3. Designs will include a rock and pipe, or other Water Quality Control Division approved proprietary distribution product, with the centerline of the distribution system 6 to 8 feet on center. A thin non -woven fabric may be placed above the distribution system. Capillary wicking of the effluent is accomplished by a uniform depth layer of the specified sand media (capillary wicks), no more than 24 inches deep, placed between and above the distribution media. The base of the evapotranspiration bed may be no more than 30 inches below finished grade. 4. Capillary wicks which penetrate between the distribution system to the bottom of the bed, must be at least 15 percent of the bed surface area. The wicks must be uniformly spaced throughout the system. 5. Except for dwellings, if the system is designed for summer use only, the surface area may be multiplied by 0.6 to obtain the required area. D. For systems designed as an evapotranspiration/absorption bed, the following criteria must be met. 1. Data to be furnished must include, but is not limited to: system dimensions, distribution system design, specifications of wicking sand, properties of the soil under the evapotranspiration/absorption bed, provision for vegetation cover, and a water balance calculation including annual precipitation and storage requirements for periods of the year when evapotranspiration does not occur. 2. Design will include a rock and pipe, or other Water Quality Control Division approved proprietary distribution product, with the centerline of the distribution system 6 to 8 feet on center. A thin non -woven fabric may be placed above the distribution media. Capillary wicking of the effluent is accomplished by a uniform depth layer of the specified sand media (capillary wicks) no more than 24 inches deep placed between and above the distribution media. The infiltrative surface may be no more than 30 inches below finished grade. 3. Capillary wicks which penetrate between the distribution system to the bottom of the bed, must be at least 15 percent of the bed surface area. The wicks must be uniformly spaced throughout the bed. 4. Amount of storage and evapotranspiration capacities may be reduced by the volume of effluent absorbed by the underlying soil based on the long-term acceptance rate for that soil type and the formulas provided in section 30-12-10 D.5. below. 5. The following formula must be used for determining the minimum area necessary for evapotranspiration/absorption of septic tank effluent: (1) Area (sq. ft.)* = Flow (clpd) (LTAR + ETR) a. LIAR refers to the long-term acceptance rate of the underlying soil as provided in Table 30-10-1 for TL1 effluent. b. ETR refers to the evapotranspiration rate derived from the following formula: ETR (gal,/day sq. ft.) = Lake Evaporation Rate at the Site (in inches per year) 586 * Additional area may be required based on the annual water balance calculations. Sec. 30-12-20. Vaults other than Vault Privies. A. Vaults for full time use in new construction are prohibited where a property can accommodate an OWTS with a soil treatment area. B. Vaults may be permitted under the following conditions: 1. Where there is limited use occupancy on a property which cannot accommodate an OWTS with soil treatment area. 2. If the facility is on land where the installation of an OWTS with soil treatment area is not permitted. 3. Where there is only a temporary water source available (bottled water, cistern). 4. Temporary use for on -location construction offices (mobile offices) not to exceed 6 months. 5. Low flow commercial uses that are temporary, such as gravel mining operations. 6. Seasonal recreational facilities where use is no more than 6 months per year 7. A vault system variance approved by the Board of Public Health. 8. Where some of the wastewater flows are separated, such as toilet wastes only, into a vault. The portion not retained in the vault must be treated in an adequately sized OWTS. C. A vault must have a minimum 500 gallon effective volume or be capable of holding a minimum of the 48 hour design wastewater flow, whichever is larger. D. A visual and audible signal device, indicating filling to a maximum of 75 percent capacity, must be installed to indicate when pumping is necessary. E. Concrete vaults must meet the strength and watertightness requirements for septic tanks. Prefabricated fiberglass, fiberglass -reinforced polyester, and plastic tanks may be used as vaults, if the tank manufacturer provides testing criteria certifying them for this use. F. Contents of the vault must be pumped by a Weld County licensed systems cleaner, and records of maintenance and proper disposal shall be maintained by the owner and available for review by the Division. Sec. 30-12-30 Vault Privies. A. Effective volume of the vault privy must be no less than 400 gallons and it must be constructed of concrete or plastic. The vaults for privies must meet the structural and watertightness standards of vaults. B. A vault privy must be built to include: fly- and rodent -tight construction, a superstructure affording complete privacy, an earth mound around the top of the vault and below floor level that slopes downward away from the superstructure base, a floor, and a riser of concrete or other impervious material with hinged seats and covers of easily cleanable, impervious material. All venting must be fly -proofed with No. 16 or tighter mesh screening. C. A signal device is not required for a vault privy. D. A permit fee, as set by the Board of County Commissioners, shall be required of applicants for any system that requires only a vault or holding tank. An application for an OWTS permit must be completed by the owner and a final inspection must be made by the Division with proper notice as specified in Section 30-4-70. Sec. 30-12-40. Incinerating, Composting and Chemical Toilets. A. The use of an incinerating, composting or chemical toilet will not reduce the required size of the OWTS as noted in Section 30-8-10. B. Incinerating and composting toilets may be permitted. Incinerating and composting toilets shall bear the seal of approval of the NSF or an equivalent test and certification program. C. Permitting of an incinerating or composting toilet may also be subject to the jurisdiction of a local agency regulating plumbing or the Colorado Plumbing Board, whichever has jurisdiction over plumbing in the location. D. An incinerating or composting toilet may be used for toilet waste where an OWTS is installed for treating wastewater remaining after removal of toilet waste. Subject to Board of Public Health, or other applicable regulations or codes (e.g., Colorado Plumbing Code if a local code does not exist), the compartment may be located within a dwelling or building provided the unit complies with the applicable requirements of this Regulation, and provided the installation will not result in conditions considered to be a health hazard as determined by the Division. Compartment and appurtenances related to the unit must include fly -tight and vector -proof construction and exterior ventilation. E. Incinerating Toilets: An approved incinerating toilet must be designed and installed in accordance with all applicable federal, state, and local air -pollution requirements and manufacturer's instructions. 1. Incinerating Toilets Acceptance Requirements a. Incinerating toilets must meet the requirements of the NSF Protocol P157 and bear the seal of approval of the NSF or an equivalent testing and certification program. b. Incinerating toilets must be operated according to manufacturer's specifications. F. Composting Toilets. 1. Composting toilets must meet the requirements of NSF/ANSI Standard 41 and bear the seal of approval of the NSF or an equivalent testing and certification program. 2. An approved composting toilet must treat deposits of feces, urine, and readily decomposable household garbage that are not diluted with water or other fluids and are retained in a compartment in which aerobic composting will occur. 3. The effective volume of the receptacle must be sufficient to accommodate the number of persons served in the design of the unit installed. The effective volume of the unit must include sufficient area for the use of composting materials which must not be toxic to the process or hazardous to persons and which must be used in sufficient quantity to assure proper decomposition. 4. Residue from the composting toilet must be removed when it is filled to 75 percent of capacity. Residue from the unit must be properly disposed of by methods recommended by the manufacturer and acceptable to the Division. Disposal methods must prevent contamination of water and not cause a public health nuisance. Disposal using solid waste practices is recommended. 5. If a system will be installed where low temperature may be a factor, design and installation must address the effects of the low temperature. 6. Composting toilets must be operated according to manufacturer's specifications. G. Portable Chemical Toilets. 1. A portable chemical toilet may be used by permit from the Division. 2. Use of a portable chemical toilet in permanently occupied buildings is prohibited except during construction or under emergency circumstances as determined by the Division. Proper ventilation of a chemical toilet used inside must be required. Sec. 30-12-50. Treatment Systems Other Than Those Discharging Through a Soil Treatment Area or Sand Filter System. A. For systems discharging to State Waters, see Section 30-2-30.A. B. Systems that discharge other than through a soil treatment area or a sand filter system must: 1. Be designed by a professional engineer; 2. Be reviewed by the Board of Public Health; and 3. Not pose a potential health hazard or private or public nuisance or undue risk of contamination 4. Not allow drainage of effluent off of the property of origin. C. The Board of Public Health may choose to permit only systems that do not allow drainage of effluent off the property of origin. D. The following minimum performance criteria must be required for all permitted systems pursuant to this Section: 1. If effluent discharge is made into areas in which the possibility exists for occasional direct human contact with the effluent discharge, the effluent at the point of discharge must meet the minimum treatment criteria of TL3 effluent and specifically adhere to each of the following standards: a. The geometric mean of the E. coli density must not exceed 15 per 100 milliliters when averaged over any five consecutive samples, and no single sample result for E.coli can exceed 126 per 100 milliliters. b. The arithmetic mean of the standard five-day carbonaceous biochemical oxygen demand (CBOD5) must not exceed ten milligrams per liter when averaged over any three consecutive samples. c. The arithmetic mean of the total suspended solids must not exceed ten milligrams per liter when averaged over any three consecutive samples. 2. If the effluent discharge is made into an area so restricted as to protect against the likelihood of direct human contact with the discharged effluent, the effluent at the point of discharge must meet the treatment criteria of TL2 effluent and specifically adhere to each of the following standards: a. The geometric mean of the E. coli density must not exceed 126 per 100 milliliters when averaged over any five consecutive samples, and no single sample can exceed 325 E.coli per 100 milliliters. b. The arithmetic mean of the standard five-day carbonaceous biochemical oxygen demand (CBOD5) must not exceed 25 milligrams per liter when averaged over any three consecutive samples. c. The arithmetic mean of the total suspended solids must not exceed 30 milligrams per liter when averaged over any three consecutive samples. E. To determine compliance with the standards contained in this Section, the required sampling frequency for E.coli, CBOD5, and total suspended solid levels must be performed at least once per month when the system is in operation and the results submitted to the Division for compliance with the permit requirements. F. Methods of Analysis — Sampling Points: 1. All effluent samples must be analyzed according to the methods prescribed in the American Public Health Association, American Water Works Association, and Water Environment Federation: Standards Methods for the Examination of Water and Wastewater, 21St edition. 2. The sampling point must be a location that is representative of final discharge from the system. ARTICLE XIII Operation and Maintenance Sec. 30-13-10. Responsibility. The owner must be responsible for maintenance of an OWTS unless the responsibility has been contractually assigned to a tenant or a third party or a public, quasi -public, or political subdivision. Sec. 13-13-20. Service Label. For higher level treatment systems or other components under a service contract, a clearly visible, permanently attached label or plate giving instructions for obtaining service must be placed at a conspicuous location. Sec. 30-13-30. Monitoring and Sampling. A. For an OWTS for which monitoring of effluent is required, a delegated third party must collect and test effluent samples to ensure compliance with the provisions of this Regulation. B. Sampling may be required by the Division in conjunction with an enforcement action. \+Y C. Any owner or occupant of property on which an OWTS is located may request the Division to collect and test an effluent sample from the system. The Division may perform such collection and testing services. The owner or occupant must pay for these services. 1. If the Division or a delegated third party collects and tests effluent samples, a fee not to exceed that which is allowed by the OWTS Act (Title 25, Article 10) may be charged for each sample collected and tested. Payment of such charge must be stated in the permit as a condition for its continued use. 2. Conditions when the Division can require routine monitoring including, but not limited to: a. Indications of inadequate performance; b. Location in sensitive areas; c. Experimental systems. D. Sampling and analysis must be performed according to American Public Health Association, American Water Works Association, and Water Environment Federation: Standards Methods for the Examination of Water and Wastewater, 21st edition. ARTICLE XIV Technology Review and Acceptance 30-14-10 Technogy Review and Acceptance A. OWTS technologies must either be public domain, including but not limited to rock and pipe distribution systems, sand filters with pressure distribution and mound systems, with criteria for design, installation, maintenance and use as described in this regulation, or proprietary products that have received Water Quality Control Division review and acceptance before the Division may permit them for use, as stated in Section 43.13 of Regulation 43. B. The Water Quality Control Division must review and provide either comment or acceptance to the manufacturer for proprietary products in these technology categories: 1. Proprietary treatment products (e.g. treatment systems); 2. Propriety distribution products (e.g. manufactured distribution products or subsurface dripline); 3. Septic tanks; 4. Others as needed, ARTICLE XV Materials Incorporated by Reference 30-15-10 Materials Incorporated by Reference Throughout these regulations, standards and requirements by outside organizations have been adopted and incorporated by reference. The materials incorporated by reference cited herein include only those versions that were in effect as of April 10, 2017, and not later amendments to the incorporated material. APPENDIX 30-A TEXTURAL TRIANGLE DEFINING TWELVE TEXTURAL CLASSES OF THE USDA (ILLUSTRATED FOR A SAMPLE CONTAINING 37% SAND, 45% SILT, AND 18% CLAY) SOURCE: EPA Design Manual for Onsite Wastewater Treatment and Disposal Systems Soil Textural Triangle 100 90 ro 80 70 20 10 0\O 60 50 O sandy 40 clay clay silty clay o 30 sandy clay loam loamy sand \sand sandy loam clay loam silty clay loam loam silt loam 00 OO silt o0 c9p cop o O �O �p U'p Np �O Sand Separate, % APPENDIX 30-B SOIL CLASSIFICATION SYSTEM (SOIL -SEPARATE SIZE LIMITS) SOURCE: USDA NRCS Field Book (pages 2-45) USDA _ Clay One co. FINE Silt floe EARTH co. vii .05 .1 300 141i fl, Sand .25 60 mad co ROCK FRAGMENTS ;50 3 24' ,,,,,r, ornnnnrn ntlgit alonea in±r,4re ra Gravel I Cob- fine medium coarse bias Stones Boulders millimeters: 0.0002 U.S. Standard Sieve No. Owing): .002 mm .02 .5 35 1 18 2 mm 5 10 4 20 (314) 76 (3") 250 mm 600 mm (10) (25) international Clay Silt line Sand COMB Gravel Stones mllllmalars: .002 mm .02 20 2 mm 20 mm U.S standard Sieve No. (opening): 10 (314) Sand Gravel Unified Silt or Clay One medium co. line costae Cobbles Boulders millimeters: 074 .42 2 mm 4,8 10 76 300 mm U.S Standard Slave No. (openng): 200 40 10 / 4 (3/4) (3") AASHTO Clay Silt Sand Gravel or Stones Broken Rock a (angular), fine coarse One mad co. or Boulders (rounded) millimeters: .005 mm .074 .42 2 mm 9.5 25 75 mm U.S. Slendard Sieve No, (opening): 200 40 10 (.'1al f1) t3'? phial: 12 ModifieWentworth 10 clay 9 6 7 6 —t.s--•silt 5 4 —•—ro 3 2 sand 1 D -1 -2 -2 -4 -6 1i�;kalalov-- -6 -7 -8 -9 -1D -12 _4— 61 ITS- boulders -# 04— millimeters: .00025 .002 .004 .006 .015 .031 .062 125 25 5 1 2 4 B 18 32 64 128 256 4092 mm U.S. Standard Sieve No : 230 17.0 BO 35 18 10 5 APPENDIX 30-C ANNUAL FREE WATER SURFACE EVAPORATION MAP OF WELD COUNTY ADAPTED FROM NOAA TR NWS 33 UNITS: INCHESIYEAR l 45 43 40 Nunn Windsor ill 1.104s -town Erie • Greeley Ft l vpton +Briggsdale 45 CHAPTER 30 ELD CSt : UN T Y DEPA"TT ENT OF PU -SITEWASTEWATER TREATME LIC HEALTH AND ENVIRONMENT I SYSTEM REGULATIONS TABLE OF CONTENTS ARTICLE I AUTHORITY Sec. 30-1-10. Title Sec. 30-1-20. Jurisdiction, Severability, Savings Clause Sec. 30-1-30. Effective Date ARTICLE II SCOPE AND PURPOSE Sec. 30-2-10. Declaration Sec. 30-2-20. Purp;se Sec. 30-2-30. Effluent Discharged to Surface Waters ARTICLE III DEFINITIONS Sec.3-3-10 D initions a e 0 1 Abbreviations a d Acronyms ARTICLE IV ADMINISTRATION AND ENFORCEMENT Sec. 30-4-10. General Sanitation Requirements Sec. 30-4-20. Existing OWTS Review Sec. 30-4-30. Permit Application Requirements and Procedures Sec. 30-4-40. Determination of Compliance of Permit Submission Sec. 30-4-50. Denial of Permit Application Sec. 30-4-60. Access to Site Sec. 30-4-70. Notification and Inspection Stages Sec. 30-4-80. Final Approval of OVVTS Permit Sec. 30-4-90. Systems Employing New Technology Sec. 30-4-100. Product Bey hcpment PernnitEx eAme-rptal Systems m Sec. 30-4-110. Systems Contractor License Sec. 30-4-120. Regulations of Systems Cleaners Sec. 30-4-130. Variance Procedure Sec. 30-4-140. General Prohibitions Sec. 30-4-150. Prohibition of On -Site Wastewater Treatment Systems in Unsuitable Areas Sec. 30-4-160. Enforcement Sec. 30-4-170. Penalties ARTICLE V SITE AND SOIL EVALUATION Sec. 30-5-10. Site and Soil Evaluation General Requirements Sec. 30-5-20. Preliminary Investigation Sec. 30-5-30. Reconnaissance / Sec. 30-5-40. Detailed Soil Investigation Sec. 30-5-50. Markin of Soil Profile Pit Excavations or Percolation Holes, Profit Ho-�, s-,- nd-lam e o e Test P W . x v- n€ s Viar- ir4g Sec. 30-5-60. Report and Site Plan Sec. 30-5-70. Design Document Sec. 30-5-80. Site Protec ion -A -s ufit-.--Dcawtngs Sec. 30-5-90. Qualifications for a Competent Technician `ot-aro4e&o - ._Q i; en r for a_C ompet n s _ ' ec h- i i-an � � Y"F_6 a �F � n �T �.� � �. � if 8 ARTICLE VI WASTEWATER FLOW AND STRENGTH Sec. 30-6-10. Wastewater Flows Table 30-6-1 Single -Family Residential Design Flows Table 30-6-2 Estimate of Average Daily Wastewater Flow and BOD5 Load Per Person Unless Otherwise Noted Sec. 30-6-20. Wastewater Strength Table 30-6-3 Treatment Levels Table 30-6-4 High Strength Wastewater ARTICLE VII MINIMUM DISTANCES BETWEEN COMPONENTS OF AN ON -SITE WASTEWATER TREATMENT SYSTEM AND PHYSICAL FEATURES Sec. 30-7-10. Sec. 30-7-20. Sec. 30-7-30. /LA14,&71---cl>9 Minimum Horizontal Distances Dry Gulches, Cut Banks and Fill Areas On -site Wastewater Treatment System Design Consideration Soil Treatment Area Table 30-7-1 Minimum Horizontal Distances in Feet Between Components of an On -Site Wastewater Treatment System Installed After November 15, 1973 and Water, Physical and Health Impact Features Table 30-7-2 On -site Wastewater Treatment System Design Consideration and Treatment Requirements — Separation Distances from Soil Treatment Area ARTICLE VIII DESIGN CRITERIA -GENERAL Sec. 30-8-10. Performance Sec. 30-8-20. Reliability Sec. 30-8-30. Accessibility for Inspection, Maintenance, and Servicing Sec. 30-8-40. Plumbing Codes Sec. 30-8-50. Electrical Equipment Sec. 30-8-60. Indicators of Failure or Malfunctioning for Systems Utilizing Mechanical Apparatus Sec. 30-8-70. Sampling Access Sec. 30-8-80. Component Operating Instructions Sec. 30-8-90. Surface Activity Sec. 30-8-100. Floodplains Sec. 30-8-110. Business Commercial, Industrial, Institutional or Multi -Family Dwelling Wastewater Systems ARTICLE IX DESIGN CRITERIA -COMPONENTS Sec. 30-9-10. Sec. 30-9-20. Sec. 30-9-30. Sec. 30-9-40. Sec. 30-9-50. Sec. 30-9-60. Sec. 30-9-70. Sec. 30-9-80. Systems Acti-v 9 Sec. 30-,-90. Tanks and Vaults Septic Tanks Table 30-9-1 Minimum Septic Tank Size Based on Number of Bedrooms Abandonment of Tank Pipe Standards and Bedding Requirements Cleanoutsribution Box Distribution BoxDe-p- ox Drop BoxStep -own-b eta Line Stepdown/Relief PipeWastewater Pumping and Dosing Siphon Wastewater Pumping and Dosing Siphon SystemsSurface Sec. 30-9-100. Effluent Screens-ase--nt-.roe-p oc-T-a- Sec. 30-9-110. Grease Interceptor Tanks ARTICLE X DESIGN CRITERIA -SOIL TREATMENT AREA Sec. 30-10-10. Soil Treatment Area General Sec. 30-10-20. Calculation of Infiltrative Surface of Soil Treatment Area Table 30-10-1 Soil Treatment Area Long-term Acceptance (44-lt Rates by Soil Texture, Soil Structure, Percolation Rate and Treatment Level Table 30-10-1A Design Criteria for Soils with High Rock Content (Type "R" Soils) 1, 2, 3, 4 Sec. 30-10-30. Allowable Soil Treatment Area Reductions and Increases Table 30-10-2 Size Adjustment Factors for Methods of Application in Soil Treatment Areas Table 30-10-3 Size Adjustment Factors for Types of Distribution Media in Soil Treatment Areas Sec. 30-10-40. Design of Distribution Systems Sec. 30-10-50. Sal Treatment Area RequirementsAlternating-aid Seque-Proi-Rg- Zone-Systems Sec. 30-10-60. Storage/Distribution MediaDo #g Sec. 30-10-70. Lift Stations Sec. 30-10-80. Soil Replacement Sec. 30-10-90. Repairs ARTICLE XI DESIGN CRITERIA -HIGHER LEVEL TREATMENT SYSTEMS Sec. 30-11-10. General Sec. 30-11-20. Treatment Levels Sec. 30-11-30. Sand Filters Sec. 30-11-40. Mound Systems Sec. 30-11-50. Rock Plant Filter (Constructed Wetland) Treatment Before a Soil Treatment Area ARTICLE XII DESIGN CRITERIA -OTHER FACILITIES Sec. 30-122 0. 'A 2--st ec ,�.'tt e r R .e rg a- -i-n g .!A f ' j Se paratien of To et a sL a„. +� .� 9 �it;:J� l✓ 9�i � er , 3 ]� � 7 f�"v �- ✓ it d.,r !—� 'od. ��+' .da e � i 'aa S s Sec. 30-12-210. Evapotranspiration and Evapotranspiration/Absorption Systems Table 30-12-1 Gradation of Wicking Sand for Evapotranspiration Beds / Sec. _ 30-----3-Q—V-a-s Q.ew-at-e r F'o R s Sec. 30-12-420. Vaults other thanan-•Vault Privies Sec. 30-12-30. Vault Privies Sec. 30-12-540. Incinerating, Composting and Chemical Toilets Sec. 30-12-650. Treatment Systems Other Than Those Discharging Through a Soil Treatment Area or Sand Filter System ARTICLE XIII OPERATION AND MAINTENANCE Sec. 30-13-10. Responsibility Sec. 13-13-20. Service Label Sec. 30-13-30. Monitoring and Sampling Appendix 30-A TEXTURAL TRIANGLE DEFINING TWELVE TEXTURAL CLASSES OF SOIL OF THE USDA Appendix 30-B SOIL CLASSIFICATION SYSTEM (SOIL -SEPARATE SIZE LIMITS) Appendix 30-C ANNUAL FREE WATER SURFACE EVAPORATION MAP OF WELD COUNTY ADAPTED FROM NOAA RR NWS 33 ARTICLE I AUTHORITY Sec. 30-1-10, Title. The Regulations contained herein shall be known as the On -site Wastewater Treatment System Regulations ("Regulations"). Sec. 30-1-20. Jurisdiction, Severability, Savings Clause. A. These Regulations are promulgated by the Weld County Board of County Commissioners under the authority of the Weld County Home Rule Charter, Section 3-8, acting as the Weld County Board of Public Health under authority of the Weld County Home Rule Charter, and upon the recommendation of the advisory Board of Public Health established pursuant to said Charter. B. If any section of these Regulations adopted hereunder or its application to any person or circumstance is held invalid, unconstitutional, void or inoperative, such holding shall not affect other provisions or applications of the ordinance adopted hereunder. The Board of Public Health and the Board of County Commissioners hereby declares that in this regard, the ordinance adopted hereunder is severable, and that said Boards would have adopted the remaining ordinance hereof notwithstanding such holding. C. The repeal of any Regulation adopted hereunder shall not deny any right, action, or cause of action, which arose under existing ordinances. D. The repeal and re-enactment of these Regulations shall not prejudice the prosecution of any violations under previous versions of these Regulations: E. The Board of County Commissioners hereby delegates these duties described herein to the Board of Public Health subject to the rights of appeal as outlined in these Regulations. F. Chapter Coverage: These Regulations adopted by the Weld County Board of Public Health, pursuant to current On -site Wastewater Treatment System Regulations of the Colorado Department of Public Health and Environment, Water Quality Control Commission, Regulation #43 (5 CCR 1002-43) and adopted in compliance with Section 25-10-104, C.R.S., shall govern all aspects of permits, performance, location, construction, alteration, installation, and use of Onsite Wastewater Treatment Systems of less than or equal to 2,000 gallons per day design capacity. Site approval, resign review and a discharge permit from the Water Quality Control Division are required for a system with design capacity greater than or equal -to 2,000 gallons per day average flow. Sec. 30-1-30. Effective Date Upon adoption, the On -site Wastewater Treatment System Regulations shall become effective upon the first day of Jul es -01 . Until the first day of 4u1SIT 044, Chapter 30 Code provisions in effect prior to the changes contained in the On -site Wastewater Treatment System Regulations shall remain in effect. ARTICLE II SCOPE AND PURPOSE Sec. 30-2-10. Declaration. A. In order to preserve the environment and protect the public health and water quality; to eliminate and control causes of disease, infection, and aerosol contamination; and to reduce and control the pollution of the air, land and water, it is declared to be in the public interest to establish minimum standards and regulations for On -site Wastewater Treatment Systems ("OWTS") within the County of Weld and to provide the authority for the administration and enforcement of such minimum standards and regulations. I / B. This regulation shall -will apply to On -site Wastewater Treatment Systems as defined in Article III of this Chapter 30. Sec. 30-2-20. Purpose A. The purpose of this regulation as authorized and required by the OWTS Act, Section 25- 10-101, et seq., C.R.S., is to establish minimum standards for the location, design, construction, performance, installation, alteration and use of OWTS within the County of Weld, including but not limited to permit application requirements; requirements for issuing permits; the inspection, testing, and supervision of installed systems; the maintenance and cleaning of systems; transportation and final disposal of sewage materials; the control of systems contractors and systems cleaners of such systems; and issuance of cease and desist orders. This Regulation meets or exceeds the requirements of the regulations adopted by the Colorado Department of Public Health & Environment, Water Quality Control Commission pursuant to Section 25-10-104, C.R.S. Sec. 30-2-30. Effluent Discharged to Surface Waters. A. Any system that will discharge into surface waters must be designed by a professional engineer. The discharge permit application must be submitted for preliminary approval to the Board of Public Health. Once approved by the Board of Public Health, the application must be submitted to the Water Quality Control Division for review in accordance with the Water Quality Control Act, Section 25-8-101, et seq., C.R.S, and all / applicable regulations of the Water Quality Control Commission. Compliance with such I a permit ll-will be deemed full compliance with this Regulation. ARTICLE III DEFINITIONS Sec. 30-3-10. Definitions. The following definitions shall apply in the interpretation and enforcement of these Regulations. The word "shall," as used herein indicates a mandatory requirement. "Absorption system" means a leaching field and adjacent soils or other system for the treatment of sewage in an On -site Wastewater Treatment System by means of absorption into the ground. See Soil treatment area. "Accessible": means easily reached, attained or entered by the necessary equipment or maintenance provider. "Applicant" means a person who submits an application for a permit for an On -site Wastewater Treatment System. Basal Area: means the effective surface area available to transmit the treated effluent from the filter media in a mound system into the in -situ receiving] soils. The perimeter is measured at trio interface of the imported fill material and in -situ soil. On sloping sites, only the area down - gradient from the up -slope edge of the distribution media may be included in this calculation. "Bed" means a below -grade soil treatment area with a level sub -base, consisting of a shallow excavation greater than three feet wide containing distribution media and more than one lateral. "Bedrock" means continuous rock that underlies the soil or is exposed at the surface. Bedrock is generally considered impervious, but if fractured or deteriorated, it may allow effluent to pass through without adequate treatment. "Bedroom" means, a room with an egress window, a closet, and/or is intended for sleeping, purposes; or as defined by the local board of health, as stated in the local OWTS red ulation. "Biochemical Oxygen Demand, Five -Day" (BOD5) means quantitative measure of the amount of oxygen consumed by bacteria while stabilizing, digesting, or treating biodegradable organic matter under aerobic conditions over a five-day incubation period; expressed in milligrams per liter (mg/L). "Biochemical Oxygen Demand, Carbonaceous Five Day" (CBOD5) means quantitative measure of the amount of oxygen consumed by bacteria while stabilizing, digesting, or treating the organic matter under aerobic conditions over a five-day incubation period while in the presence of a chemical inhibitor to block nitrification; expressed in milligrams per liter (mg/L). "Board of Public Health" means the Advisory Board of Public Health as designated by the Board of County Commissioners pursuant to the Home Rule Charter. "Building sewer" means piping that conveys wastewater to the first system component or the sewer main. "Carbonaceous Biochemical Oxygen Demand" See Biochemical Oxygen Demand, Carbonaceous. C� "Cesspool" means an unlined or partially lined underground pit or underground perforated receptacle into which raw household wastewater is discharged and from which the liquid seeps into the surrounding soil. Cesspool does not include a septic tank. "Chamber" means an open, arch -shaped structure providing an open -bottom soil interface with permeable sidewalls used for distribution of effluent in a soil absorption system. "Chapter 30" means Chapter 30 of the Weld County Code also known as the On -site Wastewater Treatment System Regulations. "Cistern" means an undergro Ind, enclosed, unpressurized reservoir or tank for storing water »part of a potable water supply system. "Cleaning" means the act of removing septage or other wastes from a wastewater treatment system component or grease/waste from a grease interceptor. f "Colorado Plumbing Code" means-Exa•m4ni-a oard-c ®9A- b s Rules and Regulations of the Colorado State R1umbing Board: (3 CCR 720-1). "Competent technician" ymea s a-pe-r -a n -desk te4- ti o `ivy o�- wko- is a -b -l- conduct 4o condu ant -4. ?1��e r ,/'&'_q� ' r ` ' . f s C re -file -test lC�"'a'�'i1-''tea f « 0 Y� � � �� G x � -� 8-"-` �' OI`� oropriate expertise and is able to conduct and interpret the results of soil profile test pit excavations, percolation tests, and site evaluations. Tnis individual has also met the required competencies for a "Competent Technician" as defined in section 30--0. mean means a person who has the may include multiple devices. "Component" means a subsection of an On -site Wastewater Treatment System; a component emi) "Composting toilet" means a self-contained waterless toilet designed to decompose non - water -carried human wastes through microbial action and to store the resulting matter for disp••sal. "Consistence" means the degree and kind of cohesion and adhesion that soil exhibits and/or the resistance of soil to deformation or rupture under an applied stress.- to an extent that the soil density would restrict soil permeability. Aspects of consistence are used to determine if the, horizon will have permeability lower than that of the defined soil typo. Additional insight to consistence can be found in the USDA — NRCS Field book for Describing and sampling soils Version 3.0, Sept. 2012. "Crest" means the highest point on the side of a dry gulch or cut bank. 66 in � A, - u ank" means a near -I\ vex Racal slope caused by erosion or construction t historic soil strata. ..4 at has expose "Deep gravel system" means a soil treatment area for repairs only where the trenches utilize v a depth of gravel greater than 6 inches below the distribution knepipe and sidewall area is allowed according to a formula specified in this Regulation. 'Deficiency", See Malfunction "Department" means the Weld County Department of Public Health and Environment. "Design" means 1) the process of selecting, sizing, locating, specifying, and configuring treatment train components that match site characteristics and facility use as well as creating the associated written documentation; and 2) written documentation of size, location, specification and configuration of a system. "Design capacity" See Flow, Design. "Design flow" See Flow, Design. "Designer, On -site Wastewater Treatment System" means a practitioner who utilizes site evaluation and investigation information to select an appropriate OVVTS and prepares a design document in conformance with this Regulation. "Distribution" means the process of conveying wastewater or effluent to one or more components, devices, or throughout a soil treatment area. "Distribution box" means a watertight component that receives effluent from a septic tank or other treatment unit and distributes effluent via gravity in approximately equal portions to two or more4 n -o- es -e 4wc or more distribution laterals in the soil treatment area. "Division" means the Division of Environmental Health Services, Weld County Department of Public Health and Environment. "Division Representative" See Environmental Health Specialist. "Domestic wastewater" See Wastewater, domestic. "Domestic S� - g-eWastewater Treatment Works" means a system or facility for treating, ,. neutralizing, stabilizing, or disposing of domestic wastewater which system or facility has a designed capacity to receive more roan 2,000 gallons of domestic wastewater per day - r mace. The term "domestic wastewater treatment works" also includes appurtenances to such system or facility such as outfall sewers and pumping stations and to equipment related to such appurtenances. The term "domestic wastewater treatment works" does not include industrial wastewater treatment plants or complexes whose primary function is the treatment of industrial wastes, notwithstanding the fact that human wastes generated incidentally to the industrial process are treated therein. Section 25-3-103 (5), C.R.S. "Dosing" means a high rate periodic discharge into a soil treatment area. "Dosing, demand" means configuration in which a specific volume of effluent is delivered to a component based upon patterns of wastewater generation from the source. "Dosing, pressure" me &-del ILL -o- -off-u n-_ un4e p Fes -s -Du ego a--Go•m ego n -e -fie- ice -o -444-9-a /s014-4reamsm-are-a$ar evefl--tsar--ution- eans a uniform application of wastewater throughout tie intended portion of the soil treatment area through small diameter aloes and orifices, under pressure. For this definition, the term pressure indicates that the system is capable of creating upward movement of effluent out of the distribution system piping "Dosing, timed" means a configuration in which a specific volume of effluent is delivered to a component based upon a prescribed interval, regardless of facility water use. "Dosing siphon" means a device used for demand dosing effluent; which stores a predetermined volume of water and discharges it at a rapid rate, from a tank at a given elevation to a component at a lower elevation, accomplished by means of atmospheric pressure anon the suction created by the weight of the liquid in the conveying pipe. "Dosing tank" means a tank, compartment or basin that provides for storage of effluent from a septic tank or other treatment unit intended to be delivered to a soil treatment area at a high rate periodic discharge. "Drainfield" See Soil treatment area. "Drop box" means a device used for serial or sequential distribution of effluent by gravity flow to a lateral of a soil treatment area. "Dry gulch" See Gulch, dry. "Drywell" means an unlined or partially lined underground pit (regardless of geometry) into which drainage from roofs, basement floors, water softeners or other non -wastewater sources is discharged and from which the liquid seeps into the surrounding soil. "Effective Size" means the size of granular media such that not -more than 10 percent by weight of the media is finer than the size specified. "Effluent" means the liquid flowing out of a component or device of an On -site Wastewater Treatment System. "Effluent filter" See Effluent screen. "Effluent pipeti-re" means non -perforated pipe that conveys effluent from one On -site Wastewater Treatment System component to the next. "Effluent screen" means a removable, cleanable (or disposable) device installed on the outlet piping of a septic tank for the purpose of retaining solids larger than a specific size and/or modulating effluent flow rate. An effluent screen may be a component of a pump installation. An effluent screen may also be installed following the septic tank but before higher level treatment components or a soil treatment area. "Environmental Health Specialist" means a person trained in physical, biological, or sanitary science to carry out educational and inspectional duties in the field of environmental health. Also known as Division Representative. "Evapotranspiration/absorption system" means an unlined On -site Wastewater Treatment component that uses evaporation, transpiration, and absorption for dispersal of effluent. "Evapotranspiration system" means an On -site Wastewater Treatment component with a continuous, impermeable liner that uses evapotranspiration and transpiration for dispersal of effluent. "Experimental system" means a design or type of system based upon improvements or development in the technology of sewage treatment that has not been fully tested. "Failure" " �L✓"' i a ge_ _ _ D --a — a —.�^ a �f s G ! 9 e jP c Fa i I u re means �;� � n-��-�� t -o � �,� �� -�� e� �, -��, � � a�—m�b�-9- condition existing within any component of an OVVTS which prevents the system from functioning as intended, and which results in the discharge of untreated or partially treated wastewater onto the ground surface, into surface water or ground watersor which results in the back-uo of sewage into the building sewer. Other conditions within an OWTS s component that are deemed by a local public health agency to be a threat to public health and/or safety may also be deemed a a 'lure. n-eotian, a "Field performance testing" means data gathering on a system in actual use that is being proposed for Water Quality Control Division acceptance. "Floodplain (100 -year)" means an area adjacent to a stream which is subject to flooding as the result of the occurrence of a one hundred (100) year flood, and is so adverse to past, current or foreseeable construction or land use as to constitute a significant hazard to public or environmental health and safety or to property or is designated by the Federal Emergency Management Agency (FEMA) or National Flood Insurance Program (NFIP). In the absence of FEMA/NFIP maps, a professional engineer &ha14must certify the flood plain elevations. "Floodway" means the channel of a river or other watercourse and the adjacent land areas that must be reserved in order to discharge the base flood without cumulatively increasing the water surface elevation more than one-half foot (6 inches) at any point or as designated by the Federal Emergency Management Agency or National Flood Insurance Program. In the absence of FEMA/NFIP maps, a professional engineer s-hal1must certify the floodway elevation and location. "Flow, daily" means the measured volume of wastewater generated from a facility in a 24 -hour period expressed as gallons per day. "Flow, design" means the estimated volume of wastewater per unit of time for which a component or system is designed. Design flow may be given in the estimated volume per unit such as person per unit time that StlaiiMLISI be multiplied by the maximum number of units that a facility can accommodate over that time. "Flow equalization" means a system configuration that includes sufficient effluent storage capacity to allow for regulated flow on a daily or multi -day basis to a subsequent component despite variable flow from the source. "Flow equalizer" means an adjustment device to evenly distribute flow between outlets in a distribution box or other device that may be out of level. "Grease interceptor tank" means a watertight device located outside a facility designed to intercept, congeal, and retain or remove fats, oils, and grease from sources such as commercial food -service that will generate high levels of fats, oils and greases. "Ground water" means that part of the subsurface water that is at or below the saturated zone. "Ground water surface" means the uppermost limit of an unconfined aquifer at atmospheric pressure. /O "Guidelines" means State Board of Health Guidelines on Individual Sewage Disposal Systems, 5 CCR 1003-6, which are the predecessor of Regulation 43, On -site Wastewater Treatment System Regulations, 5 CCR 1002-43. "Gulch, dry" means a deep, narrow ravine marking the course of an intermittent or ephemeral stream. "Health Officer" means the Director of the Weld County Department of Public Health and Environment, or other representative as designated by the Board of County Commissioners of Weld County. "Higher level treatment" means designated treatment levels other than treatment level 1.(See table 30-6-3) ,17 "Holding tank": See "vault" "Individual Sewage Disposal System" means a term used for On -site Wastewater Treatment System in Colorado Regulations from 1973 until 2013. "Infiltrative surface" means designated interface where effluent moves from distribution media o r a distribution device into soil. product into treatment media or original soil. In standard trench o r bed systems this will be the interface of the distribution media or product and in -situ soil. Two s crate infiltrative surfaces will exist in a mound system and an unlined sand filter; one at the interface of the distribution media and fill sand, the other at the interface of the fill sand and in - situ soil. "Inspection port" means an access point in a system component that enables inspection, o peration and/or maintenance. "Invert" means elevation of the bottom of the inside pipe wall or fitting. "Lateral" means a pipe, tubingchamber or other conveyance used to carry and distribute effluent. "Leach field" See Soil treatment area. "Lift Station" means a device used for the vertical lifting of sewage or effluent to the required horizontal level of either the septic tank or soil treatment area. << �W.i m-i- ang--c-or1c ition" means--- a- lay—sr—witth-Bow—perm:ea i-I ky g rot -d---w-a-te. ---u- =ace or off:n er co-ndi i -n that rest-ri-c-t-s4tne-yea-tmen-t-Ga 4 i! y -of the soil. "Limiting layer" means a horizon or condition in the soil profile or underlying strata that limits the treatment capabilkche soil or severely restricts the movement of fluids. This may include soils with low or high permeability, impervious or fractured bedrock, or a seasonal or current ground water surface a "Liner" mean an impermeable synthetic or natural material used to prevent or restrict f infiltration and/or exfiltration. For the purposes of this regulation, the minimum thickness of a liner must be 30 rill. v/(ci L near Loadig Rate: means the amount of effluent applied per linear foot along the contour pd/linear ft.). "Long -Term Acceptance Rate" (LTAR) means a design parameter expressing the rate that effluent enters the infiltrative surface of the soil treatment area at equilibrium, measured in volume per area per time, e.g. gallons per square foot per day (gal/ ft2/day). "Malfunction" means the condition in which a component is not performing as designed or installed.- and is in need of repair in order to function as originally intended. "Manufactured media" See Media, other manufactured. "Media" means solid material that can be described by shape, dimensions, surface area, void space, and application. "Media, Enhanced Manufactured" means an accepted proprietary manufactured distribution product, other than a chamber, wrapped in a specified fabric, and placea on a specified sand base or media that does not mask the infiltrative surface of the in -situ soil. 7 "Media, other manufactured" means an accepted proprietary manufactured distribution product made of synthetic media for distribution of effluent such as polystyrene blocks or beads that is placea directly on the in -situ soil. "Media, treatment" means non -or slowly -degradable media used for physical, chemical, and/or biological treatment in an On -site Wastewater Treatment System component. "Mound" means a soil treatment area whereby the infiltrative surface is at or above original grade at any point an a bone-gra4e s ag e ate a -r -e -a n -i-n n -e - r a ast 12 inches of ciea-n—sad—b we -e- the _ bona p -of the—i n-fi t -*a v s -r-fae&. a nod-th-e--edig i-Pn a--gmu- elevat-i-o-n; that _ utilizes piesari auz4e--n and Govexof suitable so -11 to stabilize the- a-ee ond support vegetative growth. "Nitrogen reduction" means a minimum 50 percent reduction of influent nitrogen strength which is the minimum objective of NSF/ANSI Standard 245 - Wastewater Treatment Systems - Nitrogen Reduction. "On -Site Wastewater Treatment System" or "OWTS" and, where the context so indicates, the term "system" means an absorption system of any size or flow or a system or facility for treating, neutralizing, stabilizing, or dispersing sewage generated in the vicinity, which system is not a part of or connected to a sewage treatment works. "Owner" means the person who is owner of record of the land on which an On -site Wastewater Treatment System is to be designed, constructed, installed, altered, or used. "OWTS Act" means the On -site Wastewater Treatment System Act, Section 25-10-101, et seq. C.R.S. "Percolation test" means a subsurface soil test at the depth of a proposed absorption system or similar component of an OWTS to determine the water absorption capability of the soil, the results of which are normally expressed as the rate at which one inch of water is absorbed. The rate is expressed in minutes per inch. "Performance standard" means minimum performance criteria for water quality and operation and maintenance established by the regulatory authority to ensure compliance with the public health and environmental goals of the state or the Division. "Permeability" means the property of a material which permits movement of water through the material. "Permit" means a permit, issued by the Division, authorizing the construction or alteration, installation, and use or for the repair of an On -site Wastewater Treatment System. "Person" means an individual, partnership, firm, corporation, association, or other legal entity and also the state, any political subdivision thereof, or other governmental entity. / "Pressure distribution" me-ans appi-cateon of effluent ovate an inf l i-v-eace-vi-a-p-ressur-ized o -r -i=ii yes and a s-oGi ated devices—and—p-ea-rts4i-ncl ud i-ng p i e s co n sroais,ane See "Dosing, pressure" "Privy" means an above grade structure allowing for the disposal of excreta not transported by a sewer and which provides privacy and shelter and prevents access to the excreta by flies, rodents, or other vectors. 1. Pit privy — privy over an unlined excavation. 2. Vault privy — privy over a vault. "Professional engineer" means an engineer licensed in accordance with Section 12-25-101, et seq., C.R.S. "Professional geologist" means a person who is a graduate of an institution of higher education which is accredited by a regional or national accrediting agency, with a minimum of thirty semester (forty-five quarter) hours of undergraduate or graduate work in a field of geology and whose post - baccalaureate training has been in the field of geology with a specific record of an additional five years of geological experience to include no more than two years of graduate work. Section 23- 41-208, C.R.S., and Section 34-1-201, C.R.S. "Proprietary product" means a manufactured component or other product that is produced by a private person. It may be protected by patent, trademark or copyright. "Public domain technology" means a system that is assembled on location from readily available components and is based on well -established design criteria and is not protected by patent, trademark or copyright. Record Drawing: means construction drawings provided to illustrate the progress or completion of the installation of an OWTS, or corn Janet of the OWTS. ty inspections by the designer or local public health agency ically based on field "Redoximorphic" means a soil property that results from the reduction and oxidation of iron and manganese compounds in the soil after saturation with water and subsequent denaturation. !3 7 "Remediation system" means a treatment system, chemical/biological additive or physical process that is proposed to restore the soil treatment area of an OWTS to g-oo-dintended performance. "Repair" means restoration of functionality and/or treatment by reconstruction, relocation, or replacement of an on -site sewage wastewater treatment system or any component thereof in order to allow the system to function as intended. / "Replacement System": See "Repair" "Riser" means a watertight vertical cylinder and lid allowing access to an OWTS component for inspection, cleaning, maintenance, or sampling. "Rock -plant filter" means a designed system which utilizes treatment media and various wetland plants to provide treatment of wastewater through biological, physical, and chemical processes. Also called a constructed wetland. "Sand filter" means an engineered designed OWTS system that utilizes a layer of specified sand as filter and treatment media and incorporates pressure distribution. "Sand filter, lined" means an engineered designed OWTS--a- -4 a :de -signed -far -hit r Lek -1 that has an impervious liner and under -drain below the specified the -sand 1ayermedia. Lined sand filters may be intermittent / single pass where the effluent is distributed over the sand bed a single time before distribution to a soil treatment area, or recirculating where part of the effluent is returned to an earlier component for additional treatment before distribution to a soil treatment area. "Sand filter, unlined" means an engineered designed OWTS that includes a layer of specified V/esand used as a treatment mediasand filter without a liner between the sand and the existing soil on which it is placed. "Seepage pit" means an excavation deeper than it is wide that receives septic tank effluent and from which the effluent seeps from a structural internal void into the surrounding soil through the bottom and openings in the side of the pit. "Septage" means a liquid or semisolid that includes normal household wastes, human excreta, and animal or vegetable matter in suspension or solution generated from a residential septic tank system. Septage may include such material issued from a commercial establishment if the commercial establishment can demonstrate to the Division that the material meets the definition of septage set forth in the preceding sentence. "Septic tank" means a watertight, accessible, covered receptacle designed and constructed to receive sewage from a building sewer, settle solids from the liquid, digest organic matter, store digested solids through a period of retention, and allow the clarified liquids to discharge to other treatment units for final disposal. I' "Sequential distribution" means a distribution method in which effluent is loaded into one 9� q trench and fills it to a predetermined level before passing through a relief tinepipe or device to the "Soil profile test pit excavation" means a trench or other excavation used for access to evaluate the soil horizons for properties influencing effluent movement, bedrock, evidence of seasonal high ground water, and other information to be used in locating and designing an On - site Wastewater Treatment System. "Soil structure" means the naturally occurring combination or arrangement of primary soil particles into secondary units or peds; secondary units are characterized on the basis of shape, size class, and grade (degree of distinctness). "Soil texture" means proportion by weight of sand, silt, and clay in a soil. i "Soil treatment area" means the physical location where final treatment and dispersal of effluent occurs. Soil treatment area includes drainfields, mounds and drip fields. "Soil treatment area, alternating" means final treatment and distribution component that is composed of two soil treatment areas that are independently dosed. 0.1 "Soil treatment area, sequencing" means a soil treatment area having more than two sections that are dosed on a frequent rotating basis. "State Waters" means any and all surface and subsurface waters which are contained in or flow in or through this state, but does not include waters in sewage systems waters in treatment works of disposal systems, waters in potable water distribution systems, and all water withdrawn for use until use and treatment have been completed. Section 25-8-103 (19) C.R.S. "Strength, wastewater" means the concentration of constituents of wastewater or effluent; usually expressed in mg/L. "Suitable soil" means a soil which will effectively treat and filter effluent by removal of /organisms and suspended solids which meets long-term acceptance rate requirements as defined in Table 30-10-1, and has the required vertical thickness below the infiltrative surface and above a limiting layer." --bra-re the effluent re -aches any hag -h -y permeable b 4ra� q-ryav !s, or ve-ry_.sam-SO4IS a nd which -r-etd-p-ercolatien-t-est or+! -fit -s-=,-ex-o t, i n cequ-rem-e rats for-det ti r Hi -n l o n t -e- .m--airoe-pta-nce-ra and has a \tart thick -sue--- at l a four feet-betow-the -the bottom of the soil tre es,n rea- I t i-e-treatmnt goal is met by oth-a crrteria. "Systems cleaner" means a person engaged in and who holds himself or herself out as a specialist in the cleaning and pumping of On -site Wastewater Treatment Systems and removal of the residues deposited in the operation thereof. "Systems contractor" means a person engaged in and who holds himself or herself out as a specialist in the installation, renovation, and repair of On -site Wastewater Treatment Systems. "Total suspended solids" means measure of all suspended solids in a liquid; typically expressed in mg/L. "Transfer of Title" means change of ownership of a property. succeeding trench. The effluent does not pass through the distribution media before it enters succeeding trenches. "Serial distribution" means a distribution method in which effluent is loaded into one trench and fills it to a predetermined level before passing through a relief pipeline or device to the succeeding trench. The effluent passes through the distribution media before entering succeeding trenches which may be connected to provide a single uninterrupted flow path. "Sewage" means a combination of liquid wastes that may include chemicals, house wastes, human excreta, animal or vegetable matter in suspension or solution, and other solids in suspension or solution, and that is discharged from a dwelling, building, or other establishment. See also Wastewater. "Sewage treatment works" has the same meaning as "domestic wastewater treatment works" under Section 25-8-103, C.R.S. "Site evaluation" means a comprehensive analysis of soil and site conditions for an OWTS. "Site evaluator" means a practitioner who conducts preconstruction site evaluations, including visiting a site and performing soil analysis, a site survey, or other activities necessary to determine the suitability of a site for an OWTS. "Slit trench latrine" means a temporary shallow trench for use as disposal of non -water -carried human waste. "Soil" means 1. unconsolidated mineral and/or organic material on the immediate surface of the earth that serves as a medium for the growth of plants and can potentially treat wastewater effluent; 2. unconsolidated mineral or organic matter on the surface of the earth that has been subjected to and shows effects of: a) pedogenic and environmental factors of climate (including water and temperature effects) and b) macro and microorganisms, conditioned by relief, acting on parent material over a period of time. "Soil evaluation" means a percolation test, soil profile, or other subsurface soil analysis at the depth of a proposed soil treatment area or similar component or system to determine the water absorption capability of the soil, the results of which are normally expressed as the rate at which one inch of water is absorbed or as an application rate of gallons per square foot per day. "Soil horizon" means layers in the soil column differentiated by changes in texture, color, redoximorphic features, bedrock, structure, consistence, and any other characteristic that affects water movement or treatment of effluent. "Soil morphology" means 1) physical constitution of a soil profile as exhibited by the kinds, thickness, and arrangement of the horizons in the profile; and by the texture, structure, consistence, and porosity of each horizon; and 2) visible characteristics of the soil or any of its parts prof i i-e-h-Gle"m e a ns - h&e c1 -o - a 1- -Bd-- ea a- -ro-po ed--s c a s t r ea tm-e mare -a -to locate bed -rook or g-rd wa=ter, if pent. bs a o K GB euttffgs-e made. i' G "Ireatment !evemeans defined concentrations o. follutants to be achieved a component or series of comp •- rents of an off. "Treatment media" See Media, treatment. visnan e fl 3air "Treatment unit" means a component or series of components where solids or pollutants are removed from wastewater or effluent from a preceding component. "Trench" means 1) below -grade soil treatment area consisting of a shallow excavation with a width of 3 feet or less containing distribution media and one lateral; and 2) excavation for placement of piping or installation of electrical wire or conduit. "Uniformity coefficient" means a value which is the ratio of D60 to D10 where D60 is the soil diameter of which 60 percent of the soil weight is finer and D10 is the corresponding value at 10 percent finer. (A soil having a uniformity coefficient smaller than 4 would be considered "uniform" for purposes of this Regulation.) "Vault" means a watertight, covered receptacle, which is designed to receive and store excreta or wastes either from a building sewer or from a privy and is accessible for the periodic removal of its contents. If the vault is intended to serve a structure or structures that are projected to generate a domestic wastewater flow of two thousand gallons per day or more at full occupancy, the vault is a domestic wastewater treatment works. Vaults are On -site Wastewater Treatment Systems. "Visual and tactile evaluation of soil" means determining the properties of soil by standardized tests of appearance and manipulation in the hand. "Volume, effective" means the amount of effluent contained in a tank under normal operating conditions; for a septic tank, effective volume is determined relative to the invert of the outlets Eror a dosing tank, the effective volume under normal conditions is determined relative to the invert of the inlet and the control off level. "Wastewater, domestic" means combination of liquid wastes (sewage) which may include chemicals, household wastes, human excreta, animal or vegetable matter in suspension or solution, or other solids in suspension or solution which are discharged from a dwelling, building or other structure. 7 "Wastewater, high strength" means 1. -J-i�aent 'Vastewater fr.m a structure having BOD5 greater than 300 mg/L; and/or TSS greater than 200 mg/L; and/or fats, oils, and grease greater than 50 mg/L-s _n4 r ng-ag- r .ire tm- -n-- o-m-porent _ (a-s-clegne-d-b-sv-MaRIANWand-acci--40-4?&st-ing pro4o-Gras); or 2. effluent from a septic tank or other pretreatment component (as dofine rb NSF/ANSI Standard 40 testing protocolLthat has BOD5 greater than 1780 mg/L; and/or TSS greater than 680 mg/L; and/or fats, oils, and grease greater than 25 mg/L and is applied to an infiltrative surface. "Wastewater pond" me ns a designed pond which receives exclusively domestic wastewater from a septic tank and which provides an additional degree of treatment. • r "Water Quality Control Commission" State of Colorado Commission created by Section 25-8- 201, C.R.S. "Water Quality Control Division" means the division of the Colorado Department of Public Health and Environment. "Wetland, constructed" See Rock -plant filter. "Wetlands" means those areas that are inundated or saturated by surface or groundwater at a frequency and duration sufficient to support, and that under normal circumstances do support, a prevalence of vegetation typically adapted for life in saturated soil conditions. Wetlands generally include swamps, marshes, bogs and similar areas. Table 30-3-1 Abbreviations and Acronyms AASHTO American Association of State Highway and Transportation Officials ANSI American National Standards Institute ASTM American Society for Testing and Materials BOD Biochemical Oxygen Demand C.R.S. Colorado Revised Statutes CBOD Carbonaceous Biochemical Oxygen Demand CSA Canadian Standards Association gpd gallons per day IAPMO International Association of Plumbing and Mechanical Officials ISDS Individual Sewage Disposal System LTAR Long-term Acceptance Rate mg/L milligrams per Liter MPI Minutes Per Inch NAWT N ational Association of Wastewater Technicians Y Non -pressurized Drip Dispersal System N PCA N ational Precast Concrete Association N SF N ational Sanitation Foundation OWTS On -site Wastewater Treatment System(s) STA Soil Treatment Area TL Treatment Level TN Total Nitrogen TSS Total Suspended Solids UL Underwriters' Laboratories ARTICLE IV ADMINISTRATION AND ENFORCEMENT Sec. 30-4-10. General Sanitation Requirements. A. The owner of any structure where people live, work, or congregate shall ensure that the structure contains an adequate, convenient, sanitary toilet and sewage system in good working order. Under no condition shall sewage or effluent be permitted to be discharged upon the surface of the ground, or into State Waters, unless the sewage or effluent meets the minimum requirements of these Regulations or the water quality standards of the Colorado Water Quality Control Commission, whichever are applicable. Any person who is aware of a malfunctioning OWTS is encouraged to report the location of the system to the Division. Sec. 30-4-20. Existing OWTS Review. A. In the case of an existing OWTS, which was installed and exists without a permit, certain circumstances, including but not limited to, a referral from the Department of Planning Services, may require evaluation to assure compliance with these Regulations. The owner of the property shall certify in written form the size of the tank in gallons and the absorption field in square feet, and provide a drawing showing the location and dimensions of the existing OWTS, as it exists at the time of review. B. The owner shall provide a pumping receipt from a Weld County licensed systems cleaner, a tank inspection report for evaluation of existing systems for loan approval inspections and any other inspections deemed necessary by the Division. The tank must have been inspected and pumped within the last two (2) years of the existing system evaluation request. Sec. 30-4-30. Permit Application Requirements and Procedures. A. Prior to installing, altering, or repairing a system, the applicant must obtain a permit from the Division. B. An applicant must submit a complete application that is consistent with Section 30-4-40.C. to the Division prior to installing, altering or repairing a system. C. Minimum Permit Application Requirements: 1. Owner name and contact information; 2. Applicant's name and contact information; 3. Property address; 4. Parcel Identification Number; 5. Property legal description; 6. Type of permit; 7. Lot size, in acres; 8. Type of building use; 9. Type of water supply; 10. The owner's signature or agent with written permission to sign for the owner; 11. Directions to the property; 12. Report from Site and Soil Evaluation (see ARTICLE V); 13. System design with a legible, accurate site plan which shows pertinent physical features on subject property, and on adjacent properties, as noted in Table 30-7-1; and 14. Other information, data, plans, specifications and tests as required by the Division, including, but not limited to: a. Additional Evaluation: When the Division Representative has determined that the Division does not have sufficient information for evaluation of an application or a system, the Division Representative may require additional tests or documentation. b. Additional Hydrological, Geological or Engineering: When specific evidence suggests undesirable soil conditions exist, additional hydrological, geological, engineering or other information provided by a professional engineer or geologist may be required to be submitted by the applicant. This requirement wills-hal-1 not prejudice the right of the Division to develop its own information from its own source(s). c. Any expenses associated with additional information, data, plans, specifications and tests shall be the responsibility of the party obtaining the permit. a 0 D. After receiving an application for an OWTS permit, the application shall be reviewed by the Division and an inspection shall be made by the Environmental Health Specialist consisting of: 1. Inspection of the premises, unless previously inspected; 2. An assessment of the general topographical conditions; 3. A preliminary assessment as to the suitability of the site and of the proposed system design based upon verification of the ground water table, suitable soil, depth to bedrock, ground slope and pertinent physical features such as the location of the OWTS with reference to wells, streams, lakes, ditches, structures, and other geographical features; E. Permit Fees 1 A permit fee, as set by the Board of Weld County Commissioners, shall be required of applicants for the installation, alteration or repair of an OWTS, payable at the time the application is received. Permit fees are non-refundable except as specifically provided in E.3. of this Section. Permit applications are non -transferable. The issuance of a permit does not denote approval of any zoning subdivision or building code requirements. 2. The Weld County Board of Public Health and/or the Division, may make provision for the waiver of any permit fee normally required for an OWTS. 3. Fee Refunds: a. The Division may authorize the refunding of any fee paid which was erroneously paid or collected. b. The Division shall not authorize the refunding of any fee paid except upon written request filed by the original permittee. F. Other Fees 1. Re -Inspection Fee - The Division may assess a re -inspection fee as established by the Board of County Commissioners for each inspection or re -inspection when such portion of work for which inspection is called is not complete or when corrections called for are not ready. 2. Surcharge - The Division must collect a fee of twenty-three dollars for each permit issued for a new, repaired, or upgraded OWTS. Of that fee, the Division shaRRmust retain three dollars to cover the Division's administrative costs and twenty dollars mustsh- R be transmitted to the state treasurer, who sh-a-l4must deposit that sum in the water quality control fund created in Section 25-8-502(1)(c), C.R.S G. Permit Term. aLl 1. If both a building permit and an OWTS permit are issued for the same property, and construction is not commenced prior to the expiration date of the building permit, the WTS permit shall expire at the same time as the building permit. Of an OWTS permit is issued for property on which no building permit is required, the OW _ E S permit shall expire one year after the permit's issuance, if construction is not commenced. 2. Any change in plans or specifications after the permit has been issued invalidates the permit unless written approval is secured from the Division 'epresentative for such changes. Expired permits can only be renewed by payment of the permit fee and only if there has been no change in the plans and specifications of the proposed system as set out in the original application; or such change is reviewed and approved by a Division Representative. H. Repair Permit 1. The Division may issue a repair permit and an emergency use permit to the owner or occupant of property on which a system is not functioning properly. Application for a repair permit shall be made by such owner or occupant to the Division within two business days after receiving notice that the system is not functioning in compliance with the OWTS Act, or applicable sections of these Regulations adopted thereunder, or otherwise constitutes a nuisance or a hazard to public health. 2. The permit shall provide for a reasonable period of time within which repairs shall be made. At the end of that period the system shall be inspected by this Division to ensure it is functioning properly. Concurrently with the issuance of a repair permit, the Division may issue an emergency use permit authorizing continued use of a malfunctioning system on an emergency basis for a period not to exceed the period stated in the repair permit. Such an emergency use permit may be extended, for good cause shown, in the event repairs may not be completed in the period stated in the repair permit through no fault of the owner or occupant and only if the owner or occupant will continue to make repairs to the system. I. A permit rnusts-al be required for the expanded use of an OWTS. The OWTS must be replaced or modified to handle the increased design flow unless it is determined that the existing system is adequately designed and constructed for the higher design flow rate. J. The issuance of a permit and specifications of terms and conditions therein willshall not constitute assumption f liability, nor create a presumption that Weld County or its officers, employees or agents may be liable for the failure or malfunctioning of any system. Permit issuance willshall not constitute a certification that the system, the equipment used in the system, or any component used for system operation will ensure continuous compliance with the provision of the OWTS Act, applicable sections of these Regulations adopted thereunder, or any terms and conditions of a permit. K. No OWTS permit shall be issued to any person when the subject property is located within a municipality or special district that provides public sewer service, except where such sewer service to the property is not feasible in the determination of the municipality or special district, or the permit is otherwise authorized by the municipality or special district. a� Sec. 30-4-40. Determination of Cmpliance of Permit Submission. A. A determination shall be made by an Environmental Health Specialist after review of the application, site and soils evaluations, assumptions and calculations, design of the proposed OWTS test results, and other required information, whether the proposed system is in compliance with the requirements of these Regulations and the OWTS Act and any other applicable rules and regulations adopted thereunder. A permit may be issued by the Division Representative if the proposed system is determined to be in compliance with the requirements of these Regulations and the OWTS Act and any other applicable rules and regulations adopted thereunder. B. After reviewing all required information, the Division may give conditional approval for a permit for the proposed OWTS, or it may recommend disapproval of the application and denial of the permit if the proposed system cannot be made to comply with these Regulations and the OWTS Act and any other applicable rules and regulations adopted thereunder. Written notice of the denial of a permit or disapproval of plans shall be served upon the applicant as provided by the Colorado Rules of Civil Procedure or by certified mail, return receipt requested. Service by mail shall be complete upon receipt by the Division of the return receipt. Any applicant whose permit application has been denied may request review of the application by the Board of Public Health as provided in Section 30-4-50. The conditional approval shall set forth conditions precedent to the issuance of a permit including effluent testing, cleaning or maintenance schedules, or other special conditions. No permit shall be issued to the applicant or to a subsequent owner until the conditions have been met. C. No permits shall be issued for the following systems unless they are designed by a professional engineer, and until they have been reviewed and approved by the Board of Public Health: 1. Product Development Perrni'ts oe--ri ian aI ys4sm-s; 2. Treatment systems other than those discharging through a soil treatment area or a sand filter system. Sec. 30-4-50. Denial of Permit Application. A. Any applicant whose permit application has been denied by the Division may request review of the application by the Board of Public Health. B. A request for review shall be made within sixty (60) days after denial. C. The applicant shall bear the burden of supplying the Board of Public Health with sufficient evidence to document that the denied system will be constructed and used in such a manner as to comply with the declaration and intent of these Regulations and all applicable state and local rules and regulations and required terms and conditions in any permit pursuant thereto. D. Should the Board of Public Health deny an appeal under this Section 30-4-50, the applicant shall have the right to appeal such decision to the Weld County Board of County Commissioners pursuant to Section 3-8(4)(n) of the Weld County Home Rule Charter and the procedures promulgated thereunder. Sec. 30-4-60. Access to Site. For the purpose of inspecting and enforcing applicable regulations and the terms and conditions of any permit issued and investigating and responding to complaints, the Division is authorized to enter upon private property at reasonable times and upon reasonable notice for the purpose of determining whether or not an operating OWTS is functioning in compliance with the OWTS Act and applicable regulations adopted pursuant thereto and the terms and conditions of any permit issued and to inspect and conduct tests in evaluating any permit application. The owner or occupant of every property having an OWTS must permit the access to the property to make inspections, conduct required tests, take samples, and monitor compliance. If access is denied, the Division Representative may apply to the District Court for an order authorizing entry. Sec. 30-4-70. Notification and Inspection Stages. A. When construction of an OWTS has been completed, the system contractor or owner shall notify the Division, and a representative of the Division shall make a final inspection within seventy-two (72) hours, or at an agreed time, after receipt of notice, Saturdays, Sundays, and holidays excepted. B. If upon final inspection of the system, the Environmental Health Specialist finds the system installed in accordance with these Regulations and the permit, the Environmental Health Specialist shall issue final approval for the completed system. If the system was required to be designed by or constructed under the supervision of a professional engineer, the Division shall require the engineer to certify, in writing, to the Division that construction and installation of the system has been completed in accordance with the terms of the permit and these Regulations. If the inspection discloses any significant departure from the description or design of the system as stated in the application and permit, or if any aspect of the system fails to comply with these Regulations, approval shall be withheld. Written notice of deficiencies causing the disapproval shall be given to the system contractor or owner. A subsequent inspection shall be made upon notification from the system contractor or owner that the deficiencies have been corrected and the system has been brought into compliance with these Regulations. Sec. 30-4-80. Final Approval of OWTS Permit. A. Final approval of the OWTS permit by the Division must include, but is not limited to: 1. k Receipt of letter from the professional engineer certifying construction of the sStrriaNTS as per the approved designed, if the OWTS was cequtirs—to--be eengineer-designed; 2. 2. Receipt of a as-builtrecord drawing which includes a scale drawing showing all components of the OWTS, including their location from known and findable points, dimensions, depths, sizes, manufacturers' names and models as available, and other information relative to locating and maintaining the OWTS components. Final inspection prior to backfilling the OWTS system by the Division confirming L.0-7 C3T that itthe OWTS was installed according to the permit requirements and regulations or variances to the regulations; and Identification of systems contractor. Sec. 30-4-90. Systems Employing New Technology. Systems employing new technology may be considered by the Division provided they have been reviewed and accepted by the Water Quality Control Division according to Section 43.13 of On -site Wastewater Treatment System Regulation #43, as adopted in 201-37. The Division prohibits the reduction of system size, or the reduction in vertical or horizontal separation when higher level treatment systems are used. Sec. 30-4-100. Product Development Permit A. For products that have not received Colorado Water Quality Control Division acceptance, the manufacturer may ap ply to the local public health ac enc for a product development permit. Requirements for proprietary treatment corn oonent acceptance are in Regulation 43-5 CCR 1002-43. B. For products or types of systems which have not been otherwise accepted by the Colorado Water Quality Control Division pursuant to section 43.13.D of Regulation 43, the Board of Public health may approve an application for product development permit only if the system has been designed by a professional engineer, and only if the application provides proof of the ability to install a replacement OVVTS in comp'iance with all local requirements in a timely manner in the event of a failure or malfunction of the system installed. C. Before a product development permit is issued, the Water Quality Control Division must determine that the oroduct to be tested qualifies for testing under the product development evaluation based on information submitted to the Division. 1. Applicant must provide evidence of nationally accepted third -party testing of the product to be evaluated, or 2. Provide test data from multiple single-family names under normal working conditions that meet the following criteria: a. Test data must be provided from a minimum of four sites. b. Each system must be tested over a period of at least one year. c. Each system must be sampled at least three times during the year with at least one sample obtained during cold weather conditions. d. Laboratory results for all parameters for which acceptance is being requested must be submitted. D. The board of health must not arbitrarily deny any person the right to consideration of an application for such a system and must apply reasonable_performance standards in determining whether to approve such an application; 25-10-108 (2), C.R.S. E. A completed application for a product development permit must be submitted to the Division at least 30 days in advance of installation of the product. F. An a ration for a product development permit must include the following: Proof of the ability to install a replacement OWTS in compliance with ail local requirements in a timely manner in the event of a failure or malfunction of the system uIlcer testing; 2. A description of the product under development including performance goals; and 3. Documentation signed by the owner of the proposteroduct development site allowing access to the local public health agency and Division for inspection of the site. Design documents as required in section 30=5J0 of this regulation. G. Other than the performance standards identified in section 30-4=100 C. 2 above, the division may stipulate additional requirements for the product development permit necessary to ensure that the system performs as intended. H. A product development permit is a site -specific permit. Product development testing al multiple sites requires a product development permit for each site. L During the term of the product development permit, all data collected is to be submitted to the Water Quality Control Division and the Division. �. The Division may revoke or amend a product development permit, if the continued operation or presence of the product under development: 1. Presents a risk to the public health or environment; 2. Causes adverse effects on the proper function of the OWTS on the site; 3. Leaks or discharges effluent on the surface of the ground; or 4. if the developer of the product fails to corn Iy with any req 9ire;ents sticulated on the permit by the Division or the Water Quality Control Division. K. If the product development permit is revoked, the product developer must install the replacement system. L. Once the system is installed and _ approved, the Division must supply tie Wa. Control Division with a copy on the completed OWTS perm t. M. The Division prohibits the reduction of s stem size, or the reduction in vertical or horizontal separation when higher level treat n gent s sterns are used. Sec. 344-40 Ex- l -z -4-t er Quality 7 1 `�- � ' ' r�t� � S\ � .,�' �' ' rvvs @. A y �• nr? �` , 7'Fl � ,P�n � /� �a Y B the �-i S v � �� ` r � s �-ri s or . -y, -e-m-s--�� -i -h-awe- r p F^ ve s bps - e - � -rQ -i a Wiacy cc n u rsu a- t -S - en -25- _ 0 -40 -8 -(4a -S. , the —Board of P u a r We i hU 02(0 for --a t p�--s- °-s4e-m- not—et-h-ervi- -- -r A r-i-n- -i regulation; only- if _ t -e- ----h-a-s --G -a -n- c -ii-fies--pro of 4h -i-i-i �- -t QVV- -- - rice 'd- y-nan-r1e-r-Er : v -e -p -€Ai B. The-- a -,-d- R o -H t -h -s h i not a- -i rriy-d-o n- p ° -n- - -s-rso a 9 h---r1gh4-te C n id- ° o �- � � p� �t i o - o -�h- - � m d—sl app- y -a -o -n -a l e- fe tl a -nc-- a n4 ara s4r d4 e r m+ni g-- e-th „e -r o �rc R e c Q -- p -o -p4 e i o � Y "{ ..- -� o�S . R`.S . ��"' k G i § � �� & a 0 a� . 1, � f '0�--3'`'� �S'� 4�- a �.s -�A. a �' tl � a..2' ��-� f �'-- C. -unmen-1(s- �i ,or-.c-o-nsid rration of -an._ -xn he —system _ shall -be -GI 7 g reb-a3n. be profes-s-i - eng1 o--iude�-- . Bch _ design •a The tests- t --h- --r n n b - . -- -r-p- . npg--r -d --the Bo-d---o-Boafthaf P Heathh . The-rn anus -Fa -du re -r- or -p s -s s-i-an- I-en-i-n e-er sha -A--- g F- e-to---c-o cl _ u-st -af- .he- -n-u -c-= -- r -s ---o6 -s-- nra- n 1n ea 's -e -p se,-su ee- d4 thg--- tl e m o p o sed-system-as-thre " rd —of h h l 1 re -g -u i re to n&urea the-- s t -- -n-mot i- s -p pe-r-i y-aS -- - -no h- y l-- o--the-to w The -duration of the Un p d -s -h a 1-1 e-d4e- i d- y _ t -- -o -rd- Sul ii c .r: --------T-1 e -anf-act um --o-r i essw a1_ - -g-Y-ry e er-s-hd-= - -1- r --a t -h d e--� n"d- -tl o tai n a-ny s -h- l -1 ---wage , -i-n-wri t-i-r-g , to -remove a urn- at o sf n ,o y4n-s -1-1-a-t-io n , as - n -n- d the -Board -of The- esi• n- -hid-pcGM-d -for - --e-i-n-s -1 - -n of -a _ b -c- u C a he COI -Grad -0a to - e t4.on -5\-- e- p i- - 4 -s -h ak-re 6�d a1� —9B _-6 -ad X17 9 tl6 g e die 9 u B t. tharb 6 3�fi6 � lSka1 19 , once NAD -o i rot A i- -- e of -0ng--ac-hara Fd 4- h- -p-u- t -heap a4 d Of -G4-, -a, ged w _-Gonf n ' f and -bee - -o-n-- y- -e D 3j Health -may --r - --M -d _ . r 4 i- — - 4he Una -pe co -� l-msde&-athe de -sign and i-nsta ati- -to--- -a-t-41-me, _ the -Board LIC-Health may require -h e-agyp- - -o- 4al t _ �a � �q g � �, �^� ,tea � . �g s f e -Y _ -be-- rep �--�oecd--`� an cG 9t vwfi ;�.- - E a t i-o'-n a ¢fit" � remrove d'�-§ a -am- e- tot. lure ti -s '_" e' , • � '. -ea -611-Sa a c - d de —ems —GI —a vi —et —tan —of —these —Re ipsta4iation shall -be h -ap 1-i-o- -4 o n for n -�� r � 1- ��s -- h�l 1-- i ric-J •d -e ;erg -i o rr - ti n ern - -a' ti -p- st on- ai ure-of -x-- s ri -syst- . The-, me kaw - er---repi- _L he d s g - t ;p t --s- -sh 11 b -P o°6ied--- v Sec. 30-4-110. Systems Contractor License. A. No person, except as in Section 30-4-110.B below, shall install, engage in the installation of, or repair an OWTS unless he holds a valid systems contractor license issued by the s em Division. Employees of a validly licensed Systems Contractor shall not be required to be licensed. The initial fee for a systems contractor license shall be set by separate Chapter of the Board of Weld County Commissioners. A license shall expire on December 31 of each year, and shall be renewed within thirty (30) days prior thereto, and an annual renewal fee, as set by separate Chapter of the Board of Weld County Commissioners, shall be charged. A license which lapses because of failure t0 renew or is revoked shall be subject to the fee established for a new license upon re -application. B. Any owner .f record shall be entitled to install one OVVTS per year for his own private use under the terms and conditions of the permit. A system contractor license shall not be required for owner -installers who have obtained permits in accordance with these regulations. However, owner -installers shall be responsible for complying with all other applicable requirements of these regulations, including but not limited to, assuring that all required inspections are scheduled with, and performed by the Division Representative. C. Standard of performance required for holders of system contractor licenses. 1. Application for systems contractors licenses or renewals shall be made upon forms supplied by the Division. 2. Prior to the issuance or renewal of a license, the Division Representative may require the applicant to demonstrate adequate knowledge of these Regulations. 3. Installation, renovation or repair of any OWTS shall be in compliance with these Regulations and with the conditions set out in the installation permit. 4. Notice of a requested inspection shall be given by the license holder not less than twenty-four (24) hours before the inspection is to be made. 5. The license holder shall ensure that a permit has been issued before installation of a system has begun. D. Revocation of License. 1. A license may be revoked for failure to comply with these Regulations or for other good cause shown above. Revocation shall take place only after a hearing before the Board of Public Health. The license holder shall be given not less than ten (10) days notice of the hearing and may be represented at the hearing by counsel. 2. Written notice of revocation explaining the violations shall be served upon the holder of the systems contractor license. Service of notice as required in this section shall be as provided by the Colorado Rules of Civil Procedure, or by registered or certified mail, return receipt requested, deliverable to the addressee only. 3. A person who has previously had a systems contractor license revoked may be denied issuance of a new license by the Board of Public Health. ce 30-4=120. Reg lations of Systems Cleaners. A. No person shall engage in the cleaning of sewage treatment works and On -site Wastewater Treatment Systems or the transportation of septage to a disposal site unless o? A such person holds a valid systems cleaner license issued by the Division. Employees of a validly licensed systems cleaner shall not be required to be licensed. The initial fee for a systems cleaner license shall be as set by separate Chapter by the Board of Weld County Commissioners. Licenses shall expire on December 31 of each year and an annual renewal fee, as set by separate Chapter by the Board of Weld County Commissioners, shall be charged. A license which lapses because of failure to renew or is revoked shall be subject to the fee established for a new license upon re -application. B. Standard of Performance for Systems Cleaners. 1 A license holder, when cleaning a septic tank or aeration plant, shall remove the liquid, solids, and scum, leaving no more than three (3) inches depth of storage in a non- backflowing septic tank or aeration plant. In backflowing types of systems, cleaning shall be effective in reducing solids and scum to the point of a near new system. 2. License holders shall maintain their equipment so as to ensure that no spillage of septage will occur during transportation, and that their employees are not subjected to undue health hazards. 3. A licensed holder shall dispose of the collected septage only by the following methods: a. By disposal in a municipal sewage treatment collection system by agreement and approval of the plant manager or responsible party. b. By disposal at a site permitted and approved by the Weld County Board of Public Health in accordance with Chapter 14 of the Weld County Code pertaining to land application of septage, specifically Chapter 14, Article 6. c. The licensed systems cleaner shall provide the Division a list of the locations and legal descriptions of all disposal sites utilized for each load transported. This shall be provided monthly except for septage that is land applied. Septage which is land applied shall meet the requirements of Chapter 14, Article 6 of the Weld County Code. d. Prior to the issuance of or renewal of a license, the Division Representative may require the applicant to demonstrate adequate knowledge of Sections 30-4-120.A and B. C. Revocation of a Systems Cleaner License: The procedures described in Section 30-4-110.D. shall be followed for the revocation of a license. Sec. 30-4-130. Variance Procedure. A. General The Division may set fees for processing an OWTS permit with a variance in accordance with the provisions of Title 25, Article 10, C.R.S. This permit fee may be the standard OWTS permit fee or may be a separate fee based upon the cost of processing a permit with a variance. d9 i 04/ B. Requirements for Variance Consideration. 1. The Weld County Board of Public Health must hear variance cases and approval of a variance requires a majority vote. 2. Prior to the rendering of a decision on a variance request, a public hearing must be held. The hearing shall be the subject of a public notice or notice shall be sent via certified mail, with a minimum twenty (20) day reply time from the date of mailing, to all adjacent property owners. The applicant may submit a signed and dated statement of acknowledgment of variance from all adjacent property owners in lieu of posting or mailing. 3. Requests must be accompanied by: 4. r :.v a. Site specific request identifying the specific criteria from which a variance is being requested. b. Technical justification by a professional engineer or professional geologist, which indicates the specific conditions which exist and/or the measures which will be taken to result in no greater risk than that associated with compliance with the requirements of the regulation. Examples of conditions which exist, or measures which might be taken, include but are not limited to the following: evidence of a natural or manmade physical barrier to the movement of effluent to or towards the feature from which the variance is requested; placement of a manmade physical barrier to the movement of effluent to or toward the feature from which the variance is requested; soil amendment or replacement with sand filter media to reduce the infiltration rate of the effluent such that the travel time of the effluent from the absorption field to the physical feature is no less than the travel time through the native soils at the prescribed setback; and treatment equivalent to Treatment Level 2. c. A discussion of alternatives considered in lieu of the requested variance; d. Technical support for selected alternative, which may include a testing program, which confirms that the variance does not increase the risk to public health and to the environment; and e. A statement of the hardship, which creates the necessity for the variance. 4. The applicant has the burden of proof of demonstrating that the variance is justified and will pose no greater risk to public health and the environment than would a system meeting the Regulations. The Division has the ability to impose requirements and conditions on any variance granted. C. Variances for Repair of Failing Systems. 0 1. When a proposed variance for a system repair or upgrade would result in encroachment on minimum distances to physical features on neighboring properties required by the Division, the hearing procedures in Section 30-4-130. B. above, Requirements for Variance Consideration must be followed. 2. For the repair of or upgrade to an app -existing system where the existing system dim does not meet the required separation distances and where theSze o E e tetconditions other than lot size precludes adherence to the required distances, a variance to the separation distances may be requested. The repairs or upgrade mLstsi-1& be no closer to features requiring setbacks than the existing facilities. Variances requesting setbacks no closer than existing setbacks do not have to provide technical justification from a professional engineer or professional geologist. D. Prohibitions on the Granting of Variance Requests. 1. No variance will be issued to mitigate an error in construction involving any element of property improvements. 2. No variance will be issued where the property can accommodate a conforming OWTS. 3. No variance will be issued which will result in setbacks to an offsite physical feature which do not conform to the minimum setbacks defined in Table 30-7-1 without the board of nea.th considering any, concerns r n -u4 n --con nt of the owner of property containing said feature. Property lines are considered offsite features. The oroperty owner containina said feature must be notified of the time and date of the hearing. 4. No variance will be issued which reduces the separation to ground water or bedrock based on the level of treatment in Item 4, Table 30-7-2. 5. No variance from the horizontal setback from a well shall be given which does not also meet the variance requirements of the Board of Examiners of Water Well Construction and Pump Installation Contractors. No variance will be allowed solely for economic gain. No variance shall be- issued for the instaa based on sizing i or separation reductions. E. Outcome of the Variance Proceeding. ation of a higher level treatment s /stem The applicant shall be notified, in writing, of the decision regarding the request for a variance. The notice of a denial of a variance shall include those reasons which form the basis for the denial. The notice of an approval of a variance shall include any conditions of the approval. The variance, and any conditions thereof shall be recorded on the deed to the property, and any expenses associated with that recording shall be the responsibility of the party obtaining the variance. F. Right to Appeal. Should the Board of Public Health deny a variance under this Section, the applicant shall have the right to appeal such decision to the Weld County Board of county commissioners 3/ pursuant to Section 3-8(4)(n) of the Weld County Home Rule Charter and the procedures promulgated thereunder. Sec. 0-4-`i ` ii'a liner I Prohibitions. A. No city, county, or city and county shall issue to any person: 1. A permit to construct or remodel a building or structure that is not serviced by a sewage treatment works until the Division has issued a permit for an OWTS. 2. An occupancy permit for the use of a building that is not serviced by a sewage treatment works until the Division makes a final inspection of the OWTS, provided for in Section 25-10-106 (1) (h), C.R.S., and the Division approves the installation. B. Use, construction or existence of cesspools, pit privies, slit trenches, and -d -seepage pits,, is prohibited. C. A person must not connect more than one dwelling, commercial, business, institutional or industrial unit to the same OWTS unless such multiple connection was specified in the application submitted and in the permit issued for the system. D. No person shall construct or maintain any dwelling or other occupied structure which is not equipped with adequate facilities for the sanitary disposal of sewage. E. All persons shall dispose of septage removed from systems in the process of maintenance or cleaning at an approved site and in an approved manner. ce 304-150. Prohibiti in of ,11n -Site Wastewater Tratment Systems in Unsuitable Areas, A. The Board of County Commissioners may conduct a public hearing, after written notice to all affected property owners as shown in the records of the County Assessor and publication of notice in a newspaper of general circulation at least ten days prior to the hearing, to consider the prohibition of permits for On -site Wastewater Treatment Systems in defined areas. The Board of County Commissioners may order such prohibition upon a finding that the construction and use of additional On -site Wastewater Treatment Systems in the defined area will constitute a hazard to the public health or the environment. In such a hearing, the Board of County Commissioners may request affected property owners to submit engineering and geological reports concerning the defined area and provide a study of the economic feasibility of constructing a sewage treatment works. Section 25-10-111, C.R.S. Sec. 304-1600 E of : rcerent. A. Notice of Violations. 1. Whenever the Division Representative determines that there has been a violation of any provision of these Regulations, he/she shall give notice of such violation to the responsible person(s). Such notice shall be in writing, shall specify the violation(s), provide a reasonable time for correction, and shall be addressed to the owner of the property. Service of such notice shall be as provided by the Colorado Rules of Civil Procedure or by certified mail, return receipt requested, deliverable to addressee only. Service by certified mail shall be completed upon. receipt by the Division of the return receipt, or upon refusal to accept delivery by the addressee. If the property owner cannot be found or served after a reasonable effort to do so by the Division, service may be made by posting a notice in a conspicuous place on or about the property affected by the notice. A statement by the Division Representative as to why the posting was necessary shall be included in the record. B. Cease and Desist Orders. 1. The Health Officer or his/her designee may issue an order to cease and desist from the use of any OWTS or sewage treatment works which is found by the Health Officer not to be functioning in compliance with these Regulations, the OWTS Act, or with applicable regulations or is found to constitute a hazard to public health, or has not otherwise received timely repairs under the provisions of Section 25-10-106 (1) 0), C.R.S. Such an order may be issued only after a hearing which shall be conducted by the Health Officer not less than 48 hours after written notice thereof is given to the owner or occupant of the property on which the system is located. The order shall require that the owner or occupant bring the system into compliance or eliminate the health hazard within thirty ( ,--tea-s-on-able-per4o-d of tir 30 ) days, or thereafter cease and desist from the use of the system. A cease and desist order issued by the Health Officer shall be reviewable in the district court for Weld County wherein the system is located and upon a petition filed not later than ten days after the order is issued. Sec. 30-4-170. Penalties. A. A. Any person who commits any of the following acts or violates any of the provisions of this Section commits a Class 1 petty offense as defined in Section 18-1.3- 503, C.R.S.: 1. Constructs, alters, installs, or permits the use of any OWTS without first having applied for and received a permit as provided for in these Regulations and the OWTS Act and any other applicable rules and regulations adopted thereunder; 2. Constructs, alters, or installs an OWTS in a manner which involves a knowing and material variation from the terms or specifications contained in the application, permit or variance; 3. Violates the terms of a cease and desist order that has become final under the terms of Section 25-10-106 (1) (k), C.R.S.; 4. Conducts a business as a systems contractor without having obtained the license provided for in these Regulations and the OWTS Act and any other applicable rules and regulations adopted thereunder; 5. Conducts a business as a systems cleaner without having obtained the license provided for in these Regulations and the OWTS Act and any other applicable rules and regulations adopted thereunder; 6. Falsifies or maintains improper records concerning system cleaning activities not performed or performed improperly; or 33 7. Willfully fails to submit proof of proper maintenance and cleaning of a system as required by these Regulations and the OWTS Act and any other applicable rules and regulations adopted thereunder. B. Upon a finding by the local board of nealth that a person is in violation of this regulation, the local board of health may assess a penalty of up to fifty dollars for each day of violation. In determining the amount of the penalty to be assessed, the local board of health shall consider the seriousness of the danger to the health of the public caused by the violation, the duration of the violation, and whether the person has previously been determined to have committed a similar violation. C. A person subject to a penalty assessed pursuant to section 30-4-170 B. may appeal the penalt ' to the local board of health by recuesting a hearing before the appropriate body. The request must be filed within thirty days after the penalty assessment is issued. The local board of health shall conduct a hearing upon the request in accordance with section 24-4-105, C.R.S. ARTICLE V SITE AND SOIL EVALUATION Sec. 30-5-10. Site and Soil Evaluation General Requirements. A. A site and soil evaluation must be conducted for each property on which an OWTS is proposed, to determine the suitability of a location to support an OWTS, and to provide the designer a sound basis to select the most appropriate OWTS design for the location and application. Each site evaluation mustshaR consist of: 1. ,, Preliminary investigation; 2. B- Reconnaissance; 3. a Detailed soil investigation; and 4. D. _ Report and site plan. Sec. 30-5-20. Preliminary Investigation. A. A pPreliminary investigation: shai: Research of information relative to the site and anticipated conditions must be conducted. Information gathered as part of the preliminary investigation s all -must include, but is not limited to: 1. Property Information: a. Address; b. Legal description; c. Existing structures; and d. Location of existing or proposed wells on the property. tit 2. Existing Division OWTS records. 3. Published site information: a. Topography; and b. Soil data. 4. Location of physical features, on and off the property that will require setbacks as identified in Table 30-7-1. 5. Preliminary soil treatment area size estimate based on information on existing or planned facility and local regulations. 6. Other information required by the Division. 7. Additional information that may be useful to the specific evaluation as available: a. Survey; b. Easements; c. Floodplain maps; d. Geology and basin maps and descriptions; e. Aerial photographs; f. Climate information; and g. Delineated wetlands maps. Sec. 30-5-30. Reconnaissance. A. A-Rceconnaissance: A visit to the property total-! evaluate the topography and other surface conditions that will impact theme location and design of the OWTS must be conducted., incluthn- information gathered as part of the site reconnaissance may include, but is not limited to: 1.A- Landscape position; . 2.-a.- Topography; 3. C Vegetation; 4 D Natural and cultural features; and 5. Current and historic land use. Sec. 30-5-40. Detailed Soil Investigation. A. Soil investigations to determine the long-term acceptance rate of a soil treatment area musts -ha -Id be e- her-condu cted oer the following criteria: 1. Visual and tactile evaluation of two or more soil profile test pit excavations; must be conducted to determine soil type as well as to determine whether a limiting layer is encountered. or 2. 2, —In addition to the two soil profile test pit excavations, percolation testing may be conducted to obtain additional information regarding the long-term acceptance rate of the soil. 3. If the site evaluation includes both a visual tactile evaluation of soil profile test pit excavations and percolation tests, and the results from these two evaluations do not coincide with the same LIAR as noted in Table 30-10-1, the designer must use the more restrictive LTAR in determining the size of the soil treatment area. Percolation is plus one or more soil profi B^ If-pe-r , -o-n tests least one soil profile -4 shall ,b vatuate4- o e- ine whether cu-rre-nt ground wa-fe-r bevels and/or bed -rock is encounters -d- th-Ph--eig,h4 +&Yfeet-oi the grou-n-c surface. A visual and tactile cvaIuan, test pit hole. 0 s _ after the eff 'f - .: a a a a a a c.. ■ , ... _ r Public Health and -En r -o- ,81ae,r _ Qua%Control, Commission's Regulation #43, and tactile evaluation --of _ a s o pro- : l.e- -, l -I be used instead of a visual or ngs -w ti-o-n-t-e-sts are *e4- r July 1, 2016, B.C, -I-fProcedure for performing visual and tactile evaluations of soil are performed w h -aroolatioMests-in order to determine a long-term acceptance rate: 1 1. The soils evaluation shall be performed by or under the supervision of a professional engineer, professional geologist, competent technician, or other similarly qualified professional as approved by the Division. 2. Evaluation of two or more soil profile test pit excavations must be performed to determine soil types and structure, restrictive, limiting layers, evi h-i~gh ground water, and best depth for the infiltrative surface. The total number of soil profile test pit excavations beyond the required two shall be based on the judgment of the competent technician. 3. 2 —At least one of the soil profile test pit excavations must be performed in the portion of the soil treatment area anticipated to have the most limiting conditions. 4. ..1 —The total number of soil profile test p-i-txcavatton requ red judgment - -competent 4echnician.The minimum depth of the soil profile test pit excavation must be to any limiting layer, or four feet below the infiltrative surface of the in -situ soil, whichever is encountered first-. 5. Layers and interfaces that interfere with the treatment and dispersal of effluent must be noted. Thus, any limiting soil characteristic such as consistence also needs to be evaluated. The evaluation of consistence may also include an evaluation of excavation difficulty, rupture resistance, and/or penetration resistance. 6. The soil observations must be conducted at or immediately adjacent to the location of the proposed soil treatment area, but if possible, not under the final location of a trench or bed. 7. Each soil profile test pit excavation observed at the proposed soil treatment area must be evaluated under adequate light conditions with the soil in an unfrozen state. 8. The soil observation method must allow observation of the different soil horizons that constitute the soil profile. 9. Soil profile test pit observations must be conducted prior to percolation tests to determine whether the soils are suitable to warrant percolation tests and, if suitable, at what depth percolation tests must be conducted. 10. The soil type at the proposed infiltrative surface of the soil treatment area or a more restrictive soil type within the treatment depth must be used to determine the long- term acceptance rate from Table 30-10-1 or Table 30-10-1A. The treatment depth is two to four feet depending on the required thickness for the treatment level below the infiltrative surface from Item 4, Table 30-7-2. 11. Soils data, previously collected by others at the site can be used for the purposes of an OWTS design at the discretion of the local public health agency. It is recommended that the data be verified, at a minimum, by performing an evaluation of a soil profile test pit excavation. C. Soil descriptions for determination of a limiting layer must include: 1. The depth of each soil horizon measured from the ground surface and a description of the soil texture, and structure of each soil horizon; 2. Depth to the bedrock; 3. Depth to the periodically saturated soil as determined by: a. Redoximorphic features and other indicators of water levels, or Pte. Depth of standing water in the soil observation excavation, measured from the ground surface, if observed, unless redoximorphic features indicate a higher level. Procedure for performing percolation tests: 1. The percolation testing shall be performed by-oror under the supervision of a professional engineer, professional geologist, competent technicianoorpe e -n -t technician or other similarly qualified professional as approved by the Division. Number of test holes; Location. 37 a. Soil percolation tests shall be performed in at least three test holes in the area in which the soil treatment area is to be located, spaced � �secably evenly over the proposed area. -There -s -hall -b- -o--1 s -s tha-net s q u -a- e490t— a're of s o44rem- fl -s - b. If the likely depth of a proposed infiltrative surface is uncertain, percolation tests s-h-l-lmust be performed at more than one depth to determine the depth of the infiltrative surface. 3. Dimensions. The percolation test hole musts-h-aU have a diameter of eight to 12 inches and be terminated a minimum of six inches and a maximum of 18 inches below the proposed infiltrative surface. 4. Change in Soil. -If a change of soil type, color or structure is present within those soils comprising the depth of soil below the infiltrative surface as required in Table 30-7-2 for vertical separation, a minimum of two soil percolation holes mustsk141- be terminated in the changed soil, and percolation tests 6 musts -h 44 be conducted in both holes. 5. Percolation Tests. a. The percolation tests s -h -all -must be conducted using the hole preparation, soil saturation and rate measurement procedures described below. b. Preparation of Percolation Test Holes a 1) Excavate the hole to the depth and diameter required. 2) Carefully scrape the bottom and sides of the hole with a knife blade or sharp instrument to remove any smeared soil surfaces and provide a natural soil interface into which water may percolate. 3) Remove all loose soil from the hole. 4) Add two inches of very coarse sand or fine gravel to protect the bottom of the hole from scouring and sediment. c. Presoak. 1) The hole must -h -a4 be presoaked adequately to accomplish both saturation, which is filling the void spaces between the soil particles, and swelling, which is the intrusion of water into the individual soil particles. 2) To presoak the hole, carefully fill the hole with clean water to a minimum depth of 12 inches over the gravel placed in the bottom of the hole. In most soils, it is necessary to refill the hole by supplying a surplus reservoir of clean water, possibly by means of an automatic siphon, to maintain water in the hole for at SJ least four hours and preferably over night. Determine the percolation rate 24 hours after water is first added to the hole. This procedure is to ensure that the soil is given ample time to swell and to approach the condition it will be in during the wettest season of the year. In sandy soils containing five percent or less particles passing the #200 sieve, by weight, the swelling procedure is not essential and the test may be conducted after the water from one filling of the hole has completely seeped out of the hole. d. Percolation Rate Measurement. 1) With the exception of sandy soils containing five percent or less particles passing the #200 sieve, by weight, percolation rate measurements s -h -must be made on the day following the presoak procedure. 2) If water remains in the percolation test hole after the swelling period, adjust the depth to approximately six inches above the gravel in the bottom of the hole. From a fixed reference point, measure the drop in water level over a se:rise-of 30 minute intervals. The drops are used to calculate the percolation rate. 3) If no water remains in the hole after the swelling period, carefully add clean water to bring the depth of water in the hole to approximately six inches above the top of the gravel in the bottom of the hole. From a fixed reference point, measure the drop in water level at 30 minute intervals for four hours, refilling to six inches over the top of the gravel as necessary. The drop in water level that occurs during the final 30 -minute period is used to calculate the percolation rate. If the water level drops during prior periods provide sufficient information, the procedure may be modified to suit local circumstances. The requirement to conduct a four hour test under this Section is waived if three successive water - level drops do not vary by more than 1/16 inch; however, in no case shall a test under this Section be less than two hours in duration. e. Sandy Soils. 1) In sandy soils or other soils in which the first six inches of water seeps out of the hole in less than 30 minutes, after the 24 hours swelling period, the time interval between measurements must !! be sago n as -ten minutes and the test conducted for one hour. The drop that occurs during the final ten minutes thal-imust be used to calculate the percolation rate. 2) If the soil is so sandy or coarse -textured that it will not retain any water, then the infiltration rate sttatimust be recorded as less than one minute per inch. f. Percolation Rate Determination and Reporting. 1) The field percolation rate en -al -Will be the average rate of the percolation rates determined for all percolation test holes observed in the proposed soil treatment area in minutes per inch. The average percolation rate determined by the tests shalimust be used in determining the long-term acceptance rate for the proposed system from Table 30-10-1. 3-9 g. 2) The technician performing the percolation tests shall furnish an accurate scale drawing, showing the location of the soil--p-rofo e -h de --s or soil profile test pit excavations and/or percolation holes tied to lot corners or other permanent objects. The drawing musts -h -a44 meet the criteria in Section 30-5-60.A.7. All holes stra-14must be clearly labeled to relate to the information provided for the profile test pits and percolation tests. Rs rool-a-fio d- st Waiver, rc;_i tra tes to the satisfaction of the Division that the system is not dependant upon soil aosorption, the --r rem of percolation tests may be waived. ffh. Alternate Percolation Testing. 1) Alternate percolation test procedures may be approved, provided the test results of alternate procedures are substantially equivalent to those determined using the test procedures described in this Section. 2) Prior approval from the Division of alternate percolation test procedures is required. E. Vi s- a1-a-nd-T--octal - vak a -ti 1. T-1oy1s al anr9 tactile evaluation of soil -h -a -H- performe professional ge-o-ogist, compe4,. as approved byre Division. 2. Fash-soli-prof- i-O e -- -excavation o -b-eel-ai a4ed under ke-ngineer, vro-cssionai eLd soil treatrner araa--m-u m -t'. T -soil obser! a4 n-s--mut-b -conducted at a-tely djace o the beat -of = h- p -r- po d s -o i-Ireat-ment a -re a s Gut f possible, not under the final lo -Gat --ion of-a-tren ch- of_bed- -1. The soil observation method mus 5-. S -oil profite-tart pit -absent -at -ions -must be- c r_ duote-d- pr y to-perso--lion tests to dete rm ne ahe he so i 1 -s -a- par ti c -n tes-t-s- ana , if suitable, at what depth percolation to n, saturated layer, to the-bec rofile test pit t e e t below -the _ pro -p E e-df--d-e nth s -mace, which-ay-v-r-which-e-vffl encountered first. 7 e --soil type at d-i ca41y fittrati-- e f ve surface of the soil treatment area or a more re -s Te+ ape within the Bat e de hI the long-term ac- �e-pta nce rate -from Ta b-i-e 30--10-1. The -1 ea-tmen-t th- is-- e-=4o-fou r feet �b claps n -ding _ on the-req-u-i-redthi k n e-ss--f o -r ---t-h vsa m'e n -t level below the infiltrative sunrcace 8. 4's --data, _ p-6 e ious1- t d -by-others at the s i te --ca-n--bey-used -fo r the purposes -c an-OA/TS d -e -g-n the d i s c F ion- of the Division. it is ra mrne--n-d-ed- t -h e cl a t be min um, by-pe-4e-rprfPe $est pit excavation. F. Sail dc--s-criptions for deter -ti-on ofimitin -la-yer—shall include: 4. he -depth of each soil -h -'c rizo n-nl -asuFe se and a description of the soil te-xto-rest u ctu re, a -n, o -n -s1 s= e n- - -a-ch soil h orLizon � p^ • e-ptd -4 o the1. r : ✓f ro—oc— �• Depth h-e-pe-4o d i oatl-y-sa46rad-so i I as d ete rm i-n-ed-by - a— edo-x- e Lu res and o4h-e,4-d-e-ators of wa4e 4e 81s —o- — e -p¢ standing water in the sod- observation exc1av ground surface, if observed Any -o h -or soil char-actecst i-c that -needs to be -d -sue b-ed 4o deskjnra _ system, such -as la -yeas ha--NAiII r-sic+�- r-meab t. Sec. 30-5-50. Markirig of Soil Profile Test u Exc vaVVons or Percolation Holes -Profile He—Tast-P A n 1 • The soil profile test pit excavations or percolation holes, -e-h-oes, andprofile +�-st of excavations -must be flagged or otherwise marked to allow easy location by others. Percolation holes and profile holes must remain open until after evaluation by the Division. The soil profile test pit excavations may be backfilled after evaluation by the third party professional {professional engineer, geologist, competent technician, or other similar professional}. If the profile test pit excavation is backfilled prior to inspection by the Division, a monitoring port shall be installed prior to backfilling for evaluation by the Division. Soil test pit excavations that are left open must be suitably barricaded to prevent unauthorized access and to address safety concerns. Sec. 30-5-60. Report and Site Plan. A. A written report shallmust describe the results of the preliminary investigation, reconnaissance, and detailed evaluations. The report may be in text and/or tabular form and s -n Rrust include a drawing locating features relative to the proposed OWTS location and test locations. The report may be included as part of the OWTS design document. The report must include, but is not limited to: 1. Company -The name, address, telephone number, e-mail address, and name of individual, credentials and qualifications of the individual conducting the site evaluation; 2. Preliminary and detailed evaluations, providing information from the surface site characteristics assessment and soils investigation; 4/ 3. Dates of preliminary and detailed evaluations; 4. A graphic soil log, to scale, indicating depth of d�-H--ho t°he soil test pit -of excavation, soil description and classification, depth to any limiting layergro-u-d sec encountered duicing-dur-i-iting-ar-e-xc-a-v-a-tion, type of equipment used to d-Y-l14h-e- p-rofe hole excavate the soil profile test pit, 9nel date of soils investigation3—name--of imn. sti-g = - d 5. Setback distances to features listed in Table 30-7-1; 6. Setback distances to features listed in Table 30-7-2, existing on the site or within applicable setback limits, whichever is greater; 7. A drawing created to a scale that provides the complete property boundary lines. The LA -minimum drawing size h - -is-be 8.5 -inches by 11 -inches. If the property is too large to adequately indicate and label the profile test pits and percolation test holes, a detail of the portion of the site containing the soil profile test pits and percolation test holes must be submitted. If the property is too large to adequately show site g q y evaluation information, a detail drawing that includes the information required from the site and soil evaluation that will impact the location of the OWTS must be submitted. Drawings s-hi4must indicate dimensions, have a north arrow and graphic scale and include: a. Fixed, ron-detradable temporary or permanent benchmark, F4horizontal and vertical reference points of the proposed soil treatment area; soil observations; percolation testing results and pertinent distances from the proposed OVVTS to ail required setbacks, lot improvements, easements; ordinary high water mark of a pond, creek, stream, lake, wetland or other surface waters, and detention or retention ponds; and property lines; b. Contours or slope direction and percent slope; c. The location of any visible or known unsuitable, disturbed or compacted soils; d. The estimated depth of periodically saturated soils and bedrock, or flood elevation, if applicable; and e. The proposed elevation of the infiltrative surface of the soil treatment area, from an established datum (either ground surface or a benchmark). 8. Anticipated construction -related issues, if applicable; 9 An assessment of how known or reasonably foreseeable land use changes are expected to affect the system performance, including, but not limited to, changes in drainage patterns, increased impervious surfaces and proximity of new water supply wells; if applicable; and 10. A narrative explaining difficulties encountered during the site evaluation, including but not limited to identifying and interpreting soil and Iandform features and how the difficulties were resolved, if ap licable. Seca 3O-5=70. 05ir!. ` Rocument. A. The report and site plan may be attached to the design document or the report and site plan may be combined with the design information as a single document. / B. The design document r us s -h -a -ht include a brief description of the facility and its proposed P use, basis and calculations of design flow, and influent strength. C. The design document must contain all plan detail necessary for permitting, installation and maintenance, including: V 1. 1. --Assumptions and calculations for each component, including total dynamic head (TON) and gallons per minute (GPM) for all dcsincSm9 s; 2. A fixed ; n redable ter soorary or ermanent benchmark, (North America Vertical Datum or assumed elevation _ is acceptable); 3.- A scale drawing showing location of each OWTS component and distances to water supplies surface water, physical and health impact features on both the subject and ad acent prooerties requiring setbacks; 37 Layout of soil treatment area, dimensions of trenches or beds, distribution method and equipment, distribution boxes, drop boxes, valves, or other components used; 5.4 e Elevation or -depth of infiltrative surface of the soil treatment area, depth -of -the septic tank invert, d-eptih-a.nd all --of other components of the UNTS; ; 6.5. Special structural design considerations, as applicable to ensure the long-term integrity of each componen Spe -fi- i-o i each corn-pe n+,%sc . a -Ross Toc se ti-c tanker 9 te-r-V 8.. -u r i~ d oo m- p e flu st - -nc P e ad -d n -a l pr -e- -s-a e —1 -o -d-s-, arid —h-i - - st e I -e a4 i_e n —o -f g -u-n -at - 9 v -e s -i e Fees _ to i- tea a i at 9 G TT a0-Sif C1 --SUL L e �-o ti -p ec4c a in- ^ -S — ,; o ✓x —1 3 e —s# , 7.6, References to design manuals or other technical materials used; 8. Installation procedures, as applicable; Operation and maintenance manuals or instructions; and 10.9-: Other information that may be useful such as photos and cross-section drawings. ti3 y c 3-04- V5/ �.Y' 9 _ Aai -SQ`" -d-r wi- �� s ,moo _ ag 3 s E A ge bo vAy g �. p'ns°has �,�'?�'�,da G,9 �_�c��0`�i�`h- �""�`�9-�'�., `a�'a�.�E�.'-�' ��''� �v' �e`�o��"-a in -stager L� t�s'�'-'`�a s-Fed1� °.s�B rig � �� cA �d �"e- a o?7-u�� 3 d3 d F "f dow 1 t -s ,` `a r "a a 9 +-n ', "" t- 9` - s., s -t e m1anu*a e r: -m-e-s----an-d--m-o d l -s aS---a-va...9-a-b4e , a n .-o t . w--i nform-a4o -- et f l- ---to _ ON -TS -corn °.b e- n- s . Sec. 30-5-98O. Site Protection. - h-,�- Prior to and Dduring construction, the proposed soil treatment area and replacement area, if any, must be protected from disturbance, compaction, or other damage by means of staking, fencing, posting, or other effective methods. Sec. 30-5409 0. Qualifications for a Competent Technician. A. Percolation Tests. 1. Competencies needed: a. Set up equipment; b. Perform and run percolation tests according to the procedure in this Regulation; and c. Record results and calculate percolation rates. 2. The Division may approve training for percolation testing. B. Visual and Tactile Evaluation of Soil. 1. Competencies needed: a. Identify soil types by hand texturing and observation; b. Identify presence or absence of soil structure; c. Identify type and grade of soil structure; Recognize evidence of highest seasonal water surface; e. Identify layers and interfaces that will interfere with effluent movement; f. Determine the most promising depth for infiltrative surface of OWTS and for percolation tests, if used; and g. Understand basic principles of OWTS siting and design. Possible demonstrations of competence in visual and tactile evaluation of soil: a. Degree in soil science, agronomy, geology, other majors if a course(s) in soil morphology was included; or b. Attendance at training or workshop for soil evaluation for OWTS including both class and field work. (1) If the training or workshop includes an exam to verify acceptable completion of the course, a passing grade on the exam must be attained. )-7-4 3. The Water Quality Control Division m -t lust approve training for visual and tactile evaluation of soil. ARTICLE VI WASTEWATER FLOW AND STRENGTH Sec. 30-6-10. Wastewater Flows. A. The Division may require the installation of a meter to measure flow into the facility or the OVVTS. B. Single -Family Residential Homes. 1. Design flow per person must beshall be 75 gallons per day (gpd). 2. The minimum design flow for a new home musts-hamI be for a two -bedroom house, unless otherwise noted in this regulation. The minimum design flow for the repair or replacement of an OWTS of an existing one -bedroom home must be fors it be one - bedroom unless bedrooms are added. 3. For homes up to and including three bedrooms, the assumed number of persons per bedroom isshall be two for design purposes. 4. For homes with more than three bedrooms, the assumed number of persons is -h -all se six persons (first three bedrooms x two persons per bedroom) plus one additional person for each bedroom more than three bedrooms. 5. Table 30-6-1 summarizes the design flows for single-family residential homes up to six bedrooms. Table 30-6-1 Single -Family Residential Design Flows Bedrooms 2 Occupancy (# of Persons) 4 Wastewater Flow Per Person (gallons/day) 75 Design Flow (gallons/day) 300 3 6 75 450 4 7 75 525 5 3 75 600 6 9 75 675 C. Auxiliary Buildings 1. If a single-family home has an auxiliary building, such as a non-commercial shop with plumbing fixtures, the flow may be conveyed to the OVVTS of the home, or to a separate OWTS constructed to handle the flow from the auxiliary facility. 2. If the flow from the auxiliary building is only generated by residents of the home, it shall will be assumed that the OWTS for the home will be adequately sized to include the auxiliary building if the flows are combined. 3. If the auxiliary building will have users in addition to residents and the flow from the auxiliary building will flow to the OVVTS of the home, the design flow of the home must include the increased use. 4. If the auxiliary building has a separate OWTS, the facility must 4 be sized on the basis of Table 30-6-2 and a septic tank detention time of 48 hours. D. Multi -Family and Commercial On -site Wastewater Treatment Systems. 1. Design flow values and strengths for multi -family and commercial systems mustshall be determined from: a. Table 30-6-2; or b. An analysis of flows and strengths from at least three comparable facilities or from the facility, if it is an existing facility, must be submitted to the Division for approval. The analysis mustsh-atl include: 1) Metered water flows for inside use only for at least a year, or if use is seasonal, for a full season. If metered flows are less than full capacity, they mustshall be paired with actual use in units of persons present or meals served or other units as appropriate so that an actual daily rate per unit can be determined. The daily rate per unit times the number of units at full occupancy wills -hie -I4 be the design flow. 2) Total Suspended Solids and BOD5 or CBOD5 tests at times of full use. At least three samples taken at least one week apart are required. Sampling that providesequivalent and representative data through "composite sampling" may be allowed. 3) Explanation and justification for the comparability of the tested facilities with the proposed facility. E. Flow Equalization. 1. '1- Flow equalization may be used if a facility has flows that vary from day to day by more than four times the average flow. 2. 2 —The highest peak assumed mustsha-Il be at least equal to the full capacity of the facility. 4/6 3. 3.- The stored flow -flow musts-h-falt be distributed to the soil treatment area before the next greater -than -average peak. 4. -.- Flow equalization may be used only if: a. The facility is non-residential; b. The facility is only used for one purpose; c. Flows will follow a predictable pattern; and d. There is a long-term expectation that size and pattern of the flows will remain the same. 5. 5. Timed dosed pressure distribution or timed dosed NDDS must shall be used. The soil treatment area reduction for timed -pressure distribution shallmust not be used in addition to the flow equalization reduction. 6. 6. Contingency plans must be made for expanding the capacity of the OWTS in the event of changed use at the facility. Tf►,:.-=ALE 30-6-2 Estimate of Average Daily Wastewater Flow and BOD5 Load Per Person Unless Otherwise Noted AVE AG -F POUNDS BOD5 DAY IN PER PD RESIDENTIAL WASTEWATER Single-family dwellings 75 .20 OR S -In -e I we;-i'n s aAuxiliary buildings by fixture type -g e, g y -or �7 Bath/Shower 14.7 .014 Dishwasher 1.8 .002 Kitchen sink with garbage grinder 5.8 .052 Laundry washer 19.5 .037 Lavatory 8.4 .021 Water closet (toilet) 24.8 .029 Hotels and motels room -Total with k4ts per ern-s-i nI�-g- -r--a ge- 75 _� 5 .1. grinder Multiple -family dwellings or apartmentsFloteks-a-mote1--- 750 -p9r-room w� �� h� � baths .20 �` ..gate Boarding and rooming houses (users absent during working 50Th �� hours), e- td- .15 . _�- -mo mo e�, - r ro wi-tq -p^afl-- m9 my Homes***,per unit •�i ..ItEple-tariiy.d-�°e 1507-5 �* ggg///''��,,q��}¢. rryr�y-{�_p �_d?�� l gig , , `7 tl ! "Cd'nc'SrY B ar-d nd-ro--ming houses 59 .15 Mobile home 75 .20 Mobile home park per space 300 .80 /% .. }. h �e'?[��N'! .5F . > y,, . ,p / 1i�)e�{ SST V°A� "�iN A. JM9 Sy'��':•b �S ` . � .Y kEcY«:: F 1., f . "",'. BOD5 I N 1s Vt, rat � ..xx gt ,. ` f �:» •.. `@ �+p� u'v'" .v"'�' ryp�m,�y I� 'mil_ RAGE k�� jr .. COMMERCIAL WA T T ... S d t �r '. '. :6 : ^,-gn y4_,S2 ,p ' -' POUNDS PER / 1F 1, GPD DA,� ,f� fQ Facilities Examples: with short-term Airports or bus or transient stations visitors per passenger; fairgrounds stadiums, theaters per person or auditoriums attending; ball per parks, seat race tracks , 5 .02 Airport per employee 10 .06 -arber and beauty shops per chair 100 .70* Bowling alleys per lane - toilet wastes only 5 .03* Country club per member 30 .02 County club per employee 20 .06 Dentist offices per non -wet chair 50 .14* Doctor offices per doctor 250 .80* Factories employee and plants eight -hour exclusive shift of — industrial wastewater per 20 .05 per g no showers Factories employeeper and Y plants eight g -hour exclusive shift of - showers industrial provided wastewater per 35 .08 Kennels per dog 30 .20 Laundries, self-service per commercial washer 400 .75 Office buildings per employee per eight -hour shift 15 .06 Service stations per toilet fixture 250 .50* Stores and shopping centers per square foot of retail space .1 .01* Work toilets or construction camps semi -permanent with flush 50 .17 Work toilets or construction camps semi -permanent without flush 35 .02 �`±. �au RAG POUNDS BOD5IN PER z �`:'` GPD FOOD SERVICE ESTABLISHMENT DAY Restaurant open 1 or 2 meals per seat 50 .06/meal 24 -hour restaurant per seat 75 .07/meal served Restaurant with paper service only per seat 25 .01 /meal served Additional for bars and cocktail lounges per seat 30 .02 Drive-in restaurant per car space 50 .02 =1, vt—SRA: 5 a_ rte: D5 IN INSTITUTIONAL WASTEWATER WITHOUT KITCHENS , it, POUNDS DAY PER. GPD UNLESS OTHERWISE NOTED Churches per seat; without any food service, or other uses -53.5 .01 Churches, per seat; warming kitchen only, no major food 52e0-.01 serviceHospiaals bed space per Churches, per seat; with food service, per meal served**** 4 .02 Hospitals per bed space 250 .20 Nursing homes; Group homes for developmentally 10025 disabled, per bed space .1720 Schools, Boarding per person 100 .17 Schools, Day without cafeteria, gym or showers 15 .04 Schools, Day with cafeterias, no gym or showers 20 .08 Schools, Day with cafeterias, gym and showers 25 .10 Schools, Day additional for school workers 15 .06 AVF GPD en: �zm. POUNDS BOD5IN DAY PER RECREATIONAL AND SEASONAL WASTEWATER USE>; Camps, day, no meals served 15 .12 Luxury resort 125 .17 Resort night and day 50 .12 Campground per campsite** 50 .12 Public o p en park flush toilet per fixture per hour when park is 36 .04 lbs./ fixture Public park urinal per fixture per hour when park is open 10 .01 lbs./fixture Public park shower per fixture per hour when park is open 100 .10 lbs./ fixture Public park faucet per fixture per hour when park is open 15 .04 lbs./ fixture Swimming pools and bathhouses 10 .06 trailer per unit parks ** with individual water and sewage 10050 42.24 Travel hookup trailer per unit park ** without individual water and sewage 50 .12 Travel hookup *BOD levels need further verification depending on the specific use of the facility. **Laundry facilities are to be calculated on a per commercial washer basis in accordance with other elements of this table ***For the purpose of this Table, a "Tiny home" is a structure that has only one bedroom and has <400 sq. ft. of livable space, including lofts. In this instance, the OWTS may be sized for only one bedroom. ****For churches with food service, the 4 gal/meal must be added to the 3.5 gal/seat to determine projected design flows. Sec. 30-6-20. Wastewater Strength. A. Table 30-6-3 includes levels of treatment that can be achieved by various OWTS components, excluding the soil treatment area. Systems qualifying for these treatment levels except TL1 produced by a septic tank alone must be approved by the Water Quality Control Division under Section 43.13. of OWTS Regulation #43. B. High strength waste must be reducedBOD5-s eRg l -must be reduced _to at least Treatment Level TL1 quality or lower before applying to a soil treatment area. Waste strength levels defined in Tables 30-6-3 and 30-6-4 must oe used to determine compliance. Table 30-6-3 Treatment Levels Treatment Level(mglL)TSS CBODC1 Total (mglL) Nitrogen 1Orrigl (rig/L} TL 12 180 1- 80 60-80 25 30 N/A364O TL 2 TL 2N 25 30 >50% reduction***4 TL 3 10 10 NI/A4-0--69- TL 3N A 10 10 20 nig/L (Shading indicates higher treatment levels) -f- e-neen ations ial are submitted in BOD5 without data 1n-C-BOD5, the data in BOD5 shaW-be multiplied -by 0.85 to estimate CBOD5 levelsRequirements for CBOD5 are only related to effluent samples from a higher level treatment system. **2 Domestic septic tank effluent prior to soil treatment or higher level treatment has a wide range of concentrations. These values are typical, but values used for design must account for site -specific information. ***3 Total Nitrogen does not apply to Treatment Levels TL2 and TL3. Processes intended to reduce total nitrogen are addressed in Treatment Levels TL2N and TL3N. Any total nitrogen reductions that may be observed for TL2 and TL3 are as a result of the treatment process for BOD5 and TSS reductions. 4 NSF/ANSI Standard 245 — Wastewater Treatment Systems — Nitrogen Reduction requires reduction of 50 percent rather than an absolute value. Ta 30-6-4 ig h Strength 1 /as tewater:� BOD5 (mg/L) TSS (mg/L) Fats, Oils, Grease (FOG) (mg/L) Septic Tank Influent >300 >200 >50 Septic Tank Effluent >180 >80 >25 *High strength effluent prior to a septic tank has a wide range of concentrations. The values are typical, but values used for design purposes must account for site -specific information. ARTICLE VII MINIMUM DISTANCES BETWEEN COMPONENTS OF AN ON -SITE WASTER TREATMENT SYSTEM AND PHYSICAL FEATURES Sec. 30-7-10. Minimum Horizontal Distances. A. Horizontal distances from the various components of an OWTS to pertinent terrain features, including streams, lakes, water courses, springs, wetlands, wells, subsurface drains, cisterns, water lines, suction lines, dry gulches, cut banks, dwellings, other occupied buildings and property lines, must be in accordance with Table 30-7-1. The setback requirements are applicable for minimum system performance and treatment as provided in Table 30-7-2. All distance setback modifications must be analyzed and approved by the Board of Public Health and be in complete compliance with the variance procedures of this Regulation. Acceptable methods of analyzing horizontal separation distances with higher treatment levels include but are not limited to: 1. Analyzing the intended uses of impacted surface and/or ground waters; ,5? 2. Contacting adjacent property owners for potential conflicts with property line encroachments; and 3. Analyzing potential impacts that system locations may have on building foundations and other potentially affected features. Sec. 3;x,-7-20. Dry Gulches, Cut Banks and Fill Are so A. Separation distances to dry gulches, cut banks and fill areas in Table 30-7-1 musts -ha -1 apply unless the designer or design engineer determines by observation of the exposed slope of the dry gulch or cut bank or by pr-file--hc-i-es-or soil profile test pit excavations that a c str i-velimitin layer is present that will direct or allow the effluent from the soil treatment area to move laterally and surface. In this instance, a greater distance may be r "Cell ., u i r Pl o B. A lesser distance may be used if it can be demonstrated by a professional engineer or professional geologist that the use of a barrier, such as a minimum 30 mil PVC liner placed between the soil treatment area and the slope of the dry gulch, cut bank or fill area will prevent effluent surfacing laterally. C. The separation distance between a component and the crest of a dry gulch or cut bank will be evaluated for potential erosion or slope instability if the component and the slope are too close together. If there is potential for erosion or instability, the separation distance mu sts-haq be increased until the risk is minimized. Sec. 30-7-30. n®site Wastewater Treatment System ' esign Consider .tlon and Treatment equirements — separation Dist :noes from Soil Treatment Area. A. Table 30-7-2 provides the required site evaluation, design, and treatment level considerations necessary to evaluate the site and to design and locate the soil treatment area component of an OWTS. B. Items 1, 2 and 3 in Table 30-7-2 address the allowable horizontal setback distance between the soil treatment area and the following physical features: 1. Setback distance from soil treatment area to on -site well; 2. Setback distance from soil treatment area to water features; and 3. Setback distance from soil treatment area to a dry gulch or cut bank. Item 4 in Table 30-7-2 addresses the required vertical separation distance between the infiltrative surface of the soil treatment area and the limiting-.4biv layer or the required depth of soil comprising the soil treatment area. um Hd z.. nnst 116 t . I i Stances 1 ..4 Feet =ce lied fter Nov, .m ,#er 15, el Table een Co 73 .4n o rrents' ,j -Site '''' aste :1.,, = tee Treat:, a .m;t System ter, hys&cal and ... ealth ct Features Spring, Well, Suction Potable Line Potable Supply Water Line2 Structure Structure Irrigation Property Piped upslope Lines, Lined Ditch_ or Intermittent Subsurface Stormwater Irrigation l-nf Lateral, Drywell, Structure Drain, l -¢ranee Irrigation Course, Stream, Wetland Lake, Water Ditch, Fill Gulch, Bank, (from Crest) Dry Cut Area Septic Higher Tank_ without basement level crawlspace w/basement treatment crawlspace or footing unit or footing drainsPotab Water Dosing drains le Water- Tank Suppy Sapp°- curtain Cistern4 Vault or Cistern drain Privy Treatment Septic Unit, or Tank, Vault Dosing Higher Privy Tank, Level Vault_ 502 102 5 525 10 10 50 10 -- Building Sewer or Effluent Lines 502 4052-6 0 0252 102 102 502 102 -- STA Sand Filter, Trench, STA Sub -surface System Bed, Unlined Dispersal 1003 252 20 1025 10 25 503 25 5 Lined Sand Filter 60 102 15 102-5 10 10 25 10 5 Lined Outside Evapotranspiration Wastewater of Berm of Pond Lined Field or 60 102 15 1525 10 10 25 10 5 System, Relying Unlined Percolation Partially Wastewater Minutes on Outside Sand Lined STA than per Rate Pond, Filter Inch, Evapotranspiration for Aerosol of Slower Berm Treatment in Unlined or System Soil than of With Unlined or 60 Not Other a 100 252 15 1525 10 25 25 15 10 Vault--P---r 59 02 25 `i-0 1-0 25 -;_0 System Not Treatment and Relying i-I-i-zing-Aero-so•I- on STA for 1003 102 125 125 10 0 253 10 10 MethodsDispersal -U NOTE: The minimum distances shown above must be maintained between the OWTS components and the features described. Where soil, geological or other conditions warrant, greater distances may be required by the Board of Public Health or by the Water Quality Control Commission pursuant to Section 25-8-206, C.R.S. and applicable regulations. For repair or upgrading of existing OWTS where the size of lot precludes adherence to these distances, a repaired OWTS shall not be closer to setback features than the existing OWTS, as reviewed and approved by the Water Quality Control Division. Components that are not watertight should not extend into areas of the root system of nearby trees 1 Includes potable wells, irrigation wells and monitoring wells set within a potable aquifer and infiltration galleries permitted as wells by the Division of Water Resources. 2 Crossings or encroachments may be permitted at the points as noted above provided that the water or wastewater conveyance pipe is encased for the minimum setback distance on each side of the crossing. A length of pipe shall be used -with a minimum Schedule 40 rating of sufficient diameter to easily slide over and completely encase the conveyance must be used. Rigid end caps of at least Schedule 40 rating must be glued or secured in a watertight fashion to the ends of the encasement pipe. A hole of sufficient size to accommodate the pipe mustsh -I-1 be drilled in the lowest section of the rigid cap so that the conveyance pipe rests on the bottom of the encasement pipe. The area in which the pipe passes through the end caps mustshall be sealed with an approved underground sealant compatible with the piping used. Other methods of encasement that provide equal protection are allowed. These methods must be designed by a professional engineer and approved by the local public health agency. 3 Add eight feet additional distance for each 100 gallons per day of design flows between 1,000 and 2,000 gallons per day, unless it can be demonstrated by a professional engineer or geologist by a hydrologic analysis or the use of a barrier, consisting of a minimum 30 mil PVC liner or equivalent, that contamination will be minimized. 4 All horizontal setbacks to a potable water supply cistern must be met unless a variance by the Board of Examiners of Water Well Construction and Plumb Installation Contractors is granted per section 11.4 of the Water Well Construction Rules, 2 CCR 402-2. The minimum horizontal setback that may be granted through a variance is to 25 feet. 5 If the structure is not used as a habitable unit, the isolation may be reduced by the local board of health to no less than 50 feet. 6 Building sewer installations shall meet the design requirements of the Colorado Plumbing Code. Table 30-7-2 On -site Wasteater Treatment System Design Consideration and Treatment ewuir=..m . nts separ. bon Dist nces fr o m sTreatment Area ITE 1 2 3 4 I�f L-• r!!. 0 TS Es I N N s I D E ATI o N Horizontal Se aration Distances Distance from soil treatment area to on -site well Distance from soil treatment area to pond, creek, lake, or other surface water feature Distance from soil treatment area to dry gulch or cut bank Vertical Separation Distances Treatment, depth in feet from soil - a m_ep, .a-reainfiltrative surface to a re--trtGtl-ve - I i n h i ti n p layer or-gre-End - water NOTE: Treatment levels are defined in Table 30-6-3. Sec. 30-8-10. Pert rmance. All Treatment Levs Greater than or equal to 100 feet Greater than or equal to 50 feet Greater than or equal to 25 feet 4 feet (3 feet with pressure dosing) ARTICLEVIII DESIGN CRITERIA - GENERAL The OWTS for single-family homes shall be desic ned to accom modate the proposed flows 'rom the structure as defined in 30-0-10.B. Flow estimates for multi -family r commercial OWIS must comply with 30-6-10.D.1. Expected waste strength as noted in Table 30-6-3 aid Table 30-6-4 must also be adaressed, whero applicable. Installation of low flow fixtures or the seQaration of toilet taste or of ner sources of wastewater does not allow for the reduction in the size of an OWTS. B. OWTS shall be designed and constructed to achieve the treatment level specified by the design. Sec. 3f m -20. Reliability. OUTS wm ustshal-R be designed and constructed such that each component shall function, when installed and operated, in a manner not adversely affected by normal operating conditions including erosion, corrosion, vibration, shock, climatic conditions, and usual household chemicals. Each component musts W be free of non-functional protrusions or sharp edges, or other hazards, which could cause injury to persons, animals, or properties. Design must-h-eu be such as to exclude flies and rodents and other vectors and to prevent the creation of nuisances and public health hazards and sh must provide for efficient operation and maintenance. Sec. 3O4-=3®. Accessibility for Inspection, Maintenance, and Servicing. A. A. Septic tanks musts -hall have watertight risers over each access manhole and all risers musts ' extend to or above final grade. B. For new construction, the top of any septic tank, dosing tank or vault must be no deeper than four feet below finished grade. C. &-- Each treatment component of an OWTS other than the septic tank and soil treatment area shall be equipped with access manholes with risers that extend to or above final grade, located to permit periodic physical inspection, collection and testing of samples and maintenance of all components and compartments. '�I - r, [J. � 4 _ E. . Riser Lids 1. Each riser lid must be watertight, brought to or above the surface and must shalt have a secure closing mechanism, such as a lock, special headed bolts or screws, or sufficient weight(defined as 59 pounds) to prevent unauthorized access. Components that require access for maintenance mustsh-a-P include but not be limited to submerged bearings, moving parts, pumps, siphons, valves, tubes, intakes, slots, distribution boxes, drop boxes, cleanouts, effluent screens, filters, inlet and outlet baffles, aerators, treatment equipment and other devices. F.E. Components &h-a-il must be designed and constructed so that, when installed, they mshall-ust be easily maintained, sampled, and serviced according to the manufacturer's recommendations. Easy physical access to treatment components by maintenance personnel and equipment th-allmust be provided. Sec. 30-8-40. Plumbing Codes. Plumbing fixtures, building sewers, vents, sewer lines and other appurtenances musts -h -aft be designed, operated and maintained so as to comply with the minimum requirements of the locally enforced plumbing code. In the absence of a local plumbing code, designs mustshag adhere to the Colorado Plumbing Code (3 CCR 720-1). A local plumbing permit may be required. Sec. 30-8-50. Electrical Equipment. l A. All electrical work, equipment, and material musts-hal4 comply with the requirements of the locally enforced code. A local electrical permit may be required. B. Electrical components musts -hat be protected from moisture and corrosive gases. Sec. 30-8-60. Indicators of Failure or Malfunctioning for Systems Utilizing Mechanical pparatus. A signal device shallmust be installed which will provide a recognizable indication or warning to the user that the system or component is not operating as intendedor is operating but malfunctioning. This indication or warning musts -ha -11 be a visual signal ander an audible signal or both and s-allmust be located in a centralized area within visual and audible range of the system user. A signal or message may also be sent remotely to a maintenance provider. >S? Sec. 30- S L, : -70. Sampling Access. A. If sampling for testing or as a requirement for a permit will be required of effluent from a component other than the soil treatment area, an accessible sampling point mu st h- 91 be provided. B. If sampling of the treated wastewater from the soil treatment area will be required for testing or as a requirement for a permit, a monitoring well or wells mustshall be constructed. Monitoring wells mustsh-all be located down gradient from the soil treatment area, accessible, and provided with a properly securable cover at or above the ground surface. Monitoring wells up gradient of the system may also be required. Lysimeters or other collection devices under the soil treatment area may be used instead of a monitoring well. c. 3 8 0. Com •.nent perating Instructions. A. The manufacturer of proprietary treatment units utilizing mechanical components sh-a-IWmust provide clear, concise written instructions covering the components which, when followed, snustsh !4 assure proper installation and safe and satisfactory operation and maintenance. B. If the OWTS uses public domain technology, the design engineer ha14must provide clear, concise written instructions covering the components which, when followed, s-h-atimust assure proper installation and safe and satisfactory operation and maintenance. Sec. 30 -90. Surface Activity. Activity or use on the surface of the ground over any part of the OWTS must be restricted_ The soil treatment area must not be subject to darnaoe or soil cornoaction from livestock, vehicular traffic, recreational use, or other site develo omen activity. Construction equipment not necessary to install the OWTS must be keot off of the soil treatment area to prevent undesirable compaction of the soils. to that w - -h all _ a iw#—t4 -y -e m-- o --•fu I, -Rot -c-- n-tF bu4e t o -m p ct- o - hie ac -to- Pafal----1 c ad i n g e rime -Mal k -e fr- ctur-a-I-- n ay 1-oo h e a p -o— n- o $u n-otta n ass --d- - ,g ne . Dui-i-, 14R, +coff the-g-ro-u-rte u ri e boa e s o-i--I treatment area -a n -d L\ t -of-; he *ca -v -a ion —te-- v n t GO -Mr r as anT If compaction occurs, the disturbed or compacted soil s -h - !-must be re-evaluated and/or new soil evaluations oo -ta Las -fl- y -be performed,--t-e-thaisrtufleed-or-oompacted 1�tr he system must be redesigned if the soil- -ar me e -s permeability b e changed. Sec. 30-8-100. Floodplains. A. A Nnew,_expanded or O T -n-d repaid -replacement Ova _ i S installed in a 100 -year floodplain s-hatimust meet or exceed the requirements of the Weld County Flood Plain Management Ordinance contained in Chapter 23 and the Federal Emergency Management Agency. Repairs of an existing system h -must meet the requirements as feasible. The system as approved by the Division -s-h4must be designed to minimize or eliminate infiltration of floodwaters into the system and discharge from the system into the floodwaters. -The OWTS must be located to avoid impairment to floodwaters or contamination from them during ,loading. The Division has available a floodplain guidance document. 7B. ANI}c-new or expanded OWTS must notshaR be installed in a floodway designated in a 100 -year floodplain where a conforming OWTS outside the floodway can be installer,. For any new OWTS or system repair that may affect the floodway delineation, appropriate procedures mustshe 1 be followed including revision of the floodway designation, if necessary. Sec. 30-8-110. Business Commercial, Industrial, Institutional or Multi -Family Dwelling Wastewater Systems. A. An OWTS that will serve a business, commercial, industrial or institutional property, or a multifamily dwelling roustshall: 1. Be designed by a professional engineer; 2. Receive only such biodegradable wastes for treatment and distribution as are compatible with those biological treatment processes as occur within the septic tank, any additional treatment unit and the soil treatment area; and 3. Receive authorization by rule or a class V underground injection permit from the United States Environmental Protection Agency (EPA) before an application for an OWTS permit is approved if the system may receive non-residential wastewater or is otherwise covered by the EPA underground injection control program. Subsequent to acceotance by the EPA, the Division may choose to also issue a permit for this type of use. ARTICLE IX DESIGN CRITERIA - COMPONENTS Sec. 30-9-10. Tanks and Vaults. A. Watertightness 1. Septic tanks, vaults, p ° �- da tanks, other treatment components, risers and lids si, -imust not allow infiltration of ground water or surface water and s-haRmust not allow the release of wastewater or liquids through other than designed openings. 2. When the final compartment of a tank is being proposed for use as a pump or siphon chamber, the wall between this chamber and the previous chamber must be watertight except for the intended hydraulic opening. 32. Acceptable watertightness testing methods performed at a manufacturer's site or in the field include water filling the tank or vacuum testing. B. Tank Anchoring: In locations where ground water or floodwaters may cause instability problems to the septic tank, vault, or other treatment unit in the OWTS due to flotation, the tank, vault or unit h must be anchored in a manner sufficient to provide stability when the tank is empty. Risers s -h -a- mt..ust be included in the buoyancy calculations. 1. If a manufacturer provides recommendations for anchoring designs, they may be used if they meet the conditions present at the site. .�9 i If a manufacturer does not provide recommendations for provisions to compensate for buoyancy, or if the professional engineer chooses to provide his/her own designs, the anchoring system design -4must be prepared by the professional engineer. / C. Identification and Data Marking: All tanks and treatment units s-�� atinust be permanently and legibly marked in a location for the purpose of inspection that is readily visible when inspected before backfilling. The marKing inscription shatirnus.. include the following: 1. Name of manufacturer; 2. Model or serial number, if available; 3. Effective volume and unit of measure; 4. Maximum depth of earth cover and external loads the tanks is designed to resist; and 5. Inlet and outlet identifications, if relevant. Sec. 30-9-20® Septic Tanks. A. The manufacturer taiirn1st provide sufficient information to demonstrate that the tank will meet the design specification. B. Sizing Requirements: 1. Sizing for residential capacity for new installations hatimust be based upon the number f bedrooms according to Table 30-9-1: Table 3 " m =1 Minimu sestic Tank Size Based on Number of Bedrooms '51 .., ber of edroorns 2 or 4 Each Additional Tank Capacity (gallons) 1,000 1,250 250 2. For multi -family and non-residential applications, a septic tank rnustsh-a.E be sized to permit detention of incoming wastewater design flows for a minimum of 48 hours. 3. For systems that remove toilet waste for separate treatment, tank capacity may be less than 1,000 gallons, if it provides a minimum of 48 hours detention time. 4. Minimum tank size for new installations other than for a single-family residence is 400 gallons. JC. I ispection and Testing of Septic Tank Watertightness. 1. Testing of septic tanks must be performed and evaluated as specified in Section 9 of ASTM 01227-123 (Standard Specification for Precast Septic Tanks) for concrete tanks or in Standard IAPMO/ANSI 21000-209--� 13 (American Standards for Prefabricated Septic Tanks) for other prefabricated septic tanks. Each unit shaRrnust be inspected in the field for conditions that may compromise its watertightness. 3. The inspection in the field sh l -E us1 be conducted by the Division and be performed after the tank installation but before backfilling. 4. If the inspection in the field indicates that the tank may be damaged or is not watertight, the Division Representative may require that the tank be tested for watertightness by the tank manufacturer or the system contractor. D. Septic Tank Design and Dimension Criteria. 1. A septic tank s-h•a-l-l•ust have two or more compartments or more than one tank may be used in series. The first compartment of a two -compartment tank or the first tank in a series sh-aii-must hold no less than one-half of the required effective volume. 2. Inlet invert s allmust be at least two inches higher than the outlet invert. 3. Inlet tee or baffle sing —must extend above the surface of the liquid at least five inches and s -h Rmust extend a minimum of eight inches below the liquid surface. However the inlet tee or baffle must not extend to a daglh of more than 40 ercent of the lid depth measured from the liquid surface. 4. Outlet tee or baffle soh- must extend at least 5 inchos above and 14 inches below the outlet invert, however it must not extend, to more than 40 percent of the liquid depth f^ �•r measured from the liquid surface and, needy -d -be- m-sd- d4o_accornm- -ate--a-n sfflu-e-- ree-n-. The outlet tee or baffle that accommodates an effluent screen must be located so that the effluent screen has sufficient clearance to be removed through the access opening with a riser in place. 5. The distance from the outlet invert to the underside of the tank top -shrailmust be at least ten inches. 6. Liquid depth that -must be a minimum of 30 inches and the maximum depth shatiRmust not exceed the tank length. 7. The transfer of liquid from the first compartment to the second or successive compartment sh must be made at a liquid depth of between 35 and 40 percent of the liquid depth measured from the liquid surface. 8. At least one access manhol- opening no less than 20 inches across na-4must be provided in each compartment of a septic tank. 9. A septic tank hailmust have a minimum of 25 square feet of liquid surface area and have at least a six-foot separation between inlets and outlets. Septic tanks in series, combined, s -h -4must have a minimum of 25 square feet of liquid surface area and the sum of the distances between inlets and outlets of all tanks must be at least six feet. The requirements for liquid surface area and separation between inlet and outlet may be waived for tanks with less than 750 gallon effective volume. E. Concrete Septic Tank Structural Design. 1. Concrete septic tanks sh-allmust comply with the structural design criteria of ASTM C1227-123 (Standard Specification for Precast Septic Tanks). 2. The design for each tank model and size by each manufacturer must be certified by a professional engineer as complying with these design and structural requirements and the watertightness standard of this Regulation. 3. Certification by a professional engineer must be submitted to the Water Quality Control Division for acceptance. 4. Tank slab lids -Par mid -seam tanks, and the connections between the tank and risers 6-1 .Er°nust be desi d ded to orovide seared -to befor a watertight seal. sealed -to -be watertight. F. Fiberglass, Fiberglass -Reinforced Polyester, and Plastic Tanks. 1. All fiberglass, fiberglass -reinforced polyester, and plastic tanks sh-a1 must meet the minimum design and structural criteria of IAPMO/ANSI Z1000-200713 (American Standards for Prefabricated Septic Tanks) and be certified by a professional engineer as meeting these standards. The professional engineer certifying the criteria must be registered or licensed in the United States, but need not be registered in Colorado. 2. All tanks shallmust be sold and delivered by the manufacturer or manufacturer's designated representative, preferably completely assembled. On -site tank assembly will be allowed on an as -needed basis. 3. Tanks shallmust be structurally sound and support external forces as specified in the standard referenced above when empty and internal forces when full. Tanks s -h -a must not deform or creep resulting in deflection of more than five percent in shape as a result of loads imposed. 4. All tanks s-ha-l-lmust be constructed of sound, durable materials and not be subject to excessive corrosion, decay, frost damage, or cracking. 5. All seams or connections including to risers shaRrnust be sealed to be watertight. G. Metal tanks are prohibited. Sec. 30-9-30. Abandonment of Tank. A. The contents of a tank shall be pumped by a Weld County licensed systems cleaner and properly disposed by methods specified in Section 30-4-120.B.3. B. A tank may be completely removed and the parts disposed of safely. C. If the tank will remain in place: (see Sec. 30-9-30.A) 1. The bottom of the tank Eh a !4 e gust be broken so the tank neither floats nor fills with water; 2. The top must be collapsed and the sides may be broken into the void; 3. The remaining void ha must be filled with gravel, sand or compacted soil; and 4. The filled excavation will be graded to surroundings, allowing for settling. 0. The Division requires abandonment of a tank that is deemed to be a hazard. Seca 30-940a a Standards and Bedding Requirements. A. Pipe Standards 1. All wastewater spipes used in cortiof is of an OWTS that a to pressurized sha4 must be constructed of compatible pipe, primer, bonding agent, and fittings. Flexio9.e couplingato c Dnnect pipes ma only oe used in portions of an OVVTS that are intended fol gravity flow of the wastewater. 2. Where unperforated plastic pipe and fittings are used for gravity flow, the minimum wall thickness of the pipe s- !llmust conform to ASTM Standard D 3034 or equivalent or greater strength. Schedule 40 pipe is preferred. 3. Perforated distribution pipe surrounded by rock within a soil treatment area mustsh-a-at, have a minimum wall thickness and perforations conforming to ASTM Standard D 2729 or equivalent or greater strength. Corrugated polyethylene pipe with smooth interior that meets ASTM F405 or AASHTO M252 specifications or equivalent may be used. 4. Schedule 40 or pipe of equivalent or greater strength must -h:4 be used for the placement of piping under driveways or roadways and in instances where sewer line setback distances are granted a variance for any reason. 5. Tile pipe, open -joint pipe, and cast iron pipe must not be used in an OWTS. 6. Pressure pipe must be rated for the intended use to accommodate pump discharge pressure. edding: All system piping, except for distribution laterals within the soil treatment area, mustsh -9-1- be bedded with select material before final inspection by the Division. Select bedding material riusts-h-all consist of loose, granular material, free from stones, clods, frozen soil, or other deleterious material. Select material may consist of on -site job - excavated or imported material. Bedding material must be mechanically compacted to support piping. C. Pipe identification and data marking must be visible for the purpose of inspection before backfilling. Section 30-9-50 Cleanouts A. Cleanouts required between the building and the seotic tank: 1. Cleanouts must have a secure cap anc a riser extending to or easily accessible from grade. The installation of a straight tee or sanitary tee is acceptable. 2. Cleanouts must be provided within five (5) feet of the outside of the ouildno 't J. Where a sewer has a change of horizontal direction greater than 45 degrees, a cleanout must be installed at the change of direction unless a cleanout already exists wiCnin 40 feet upstream of this fitting. Where more than one change of direction greater than 45 degrees occurs within 40 feet of a developed length of piping, the cleanout for the first change of direction may serve as the cleanout for all changes within that 40 feet of developed length of pipe. 4. Cleanouts must be provided at intervals within the building sewer from the structure to the tank of not more than 100 feet. The effluent pipe between the septic tank and soil treatment area is exempt from this requirement Sec. 30-9-5060. Distribution Box. A. A distribution box, if used, shallmust be of sufficient size to distribute effluent equally to the laterals -Lines of a trench or absorption bed system. The box sipiat must be constructed with the inlet invert at least one inch above the level of the outlet inverts. Flow equalizers or similar devices s -h l-Imusi be used to adjust the flow between 11-Reislaterals. Access to the box sh-a-4r ust be provided with a manhole riser with access lid at or above grade if the top of the box does not reach final grade. 1. Each lateral shall be connected separately to the distribution box. 2. The distribution box shall be watertight and all pipes shall be grouted or cemented. The box shall be located a minimum of five (5) feet from the septic tank. an _tea 4 ` ; e . --the- � . b- t-ionbox � o �� t L� h l �- b of o l ,� e for �j �l �� }-. � � 9 or ��- �sd a u '�.s 1�§ �� d �. 5' � � ;n 1 � 5 ��a '��'A a,.a -� � a � � '� a +�' "�s 3 �''�1 4. In the event that treatment tank effluent is discharged to the distribution box by a pump, a baffle shall be installed in the distribution box. The baffle shall be secured to the bottom of the box, extending vertically to a point level with the crown of the inlet pipe, and shall be perpendicular to the inlet. In lieu of a baffle, the inlet pipe may have a ninety (90) degree bend which diverts effluent downwards into the distribution box. Sec; 30 60700 Drop Box© In sequential or serial distribution, a watertight box may be used to transfer the effluent to the following trench when the effluent in a trench has received the designed level for overflow to the next trench. A drop box shall have a riser at or above final grade, if the top of the drop box does not reach final grade. Outlet -lin-e-spipes in sequential distribution sh -Ermust be designed and installed so that they may be capped off for resting periods. 69 9" Sec. 30-9-7080. Stepdown/Relief L neP pee In sequential or serial distribution, an unperforated pipe may be used to transfer the effluent to the following trench when the effluent in a trench has received the designed level for overflow from that trench. Sec. 30-9-9020. Wastewater Puy . ping and Dosint Siphon Systems. A. Pumps. 1. Non -clog pump opening sh-allmust have at least two-inch diameter solids handling capacity where raw wastewater is pumped. A pump opening s-h-llmust not have more than 3/4 -inch diameter solids handling capacity if previously settled effluent is pumped. 2. Pumps must be certified to the applicable UL or CSA electrical safety standard, bear the seal of approval of CSA, UL or an equivalent testing program and be constructed of corrosion resistant materials. 3. Grinder pumps must also be certified to NSF/ANSI Standard 46 and bear the seal of approval of the NSF or equivalent testing and certification program. B. Floats and Switches. 1 Automatic liquid level controls must be provided to start and shut off pumps at a frequency or level specified in the design. 2 Floats must be mounted on a stem separate from the pump discharge piping to allow for removal, adjustment, and replacement of the float from grade without removing the pump. a. Float switches must be certified to the applicable UL or CSA electrical safety standard, bear the seal of approval of CSA, UL or an equivalent certification program and be constructed of corrosion resistant materials. Dosing siphons for pressure dosin. and higher level treatment systems must provide for a means of determining the number o.f dosing events. C. Location of Pump or Siphon. 1 A pump may -Lae, -or a siphon s-h-attmay be; installed in a separate tank following the septic tank. and. The tank must be of sufficient volume to allow pump or siphon cycling commensurate with the design capacity. - tee--- a--4h.ce -Gem- --m-e 5ia t Raz F b; rc m artm- nt- wi 6 h4he-pu"m' � p 7�4h�' mp ° aapta Sri C§ a �� s a a o u, 9 a eT 2. The second compartment of the a two -compartment septic tank shall notmbonly be used as the pump tank un-a-ssawhen the tank is specifically designed for this purpose and it can be demonstrated to the satisfaction of the Division that the minimum 48 - hour detention time will not be decreased; The-andthe pump srnust be screened or provided with an approved filtering device to assure that only liquid effluent will be discharged. Me transfer of liquid from the first to the second compartment must be at an elevation that is between the inlet and outlet invert elevations, and through a standard tee designed and located as per the requirements of section 30-9-20.D.4. Siphons must not be installed in the second compartment of a two compartment tank. 3.The use of a three -compartment septic tank, sized to provide the required effective volume in the first two compartments with the pump or siphon in the third compartment is acceptable for tanks specifically designed for this purpose. The transfer of liquid from the second to tne third compartment must be at an elevation that is between the inlet and outlet invert elevation, and through a standard tee designed and located as per the requirements of section 30-9-20.D.4. D. Pump or Siphon Discharge Piping. 1 The discharge line,pipe from the pumping or siphon chamber shailmust. be protected from freezing by burying the pipe below frost level or sloping the pipe to allow it to be self -draining. Drainage must- :°R be provided through the bottom of the pump or through a weep hole located in the discharge finepipe prior to exiting the tank. 2. The pump discharge piping shall --must have a quick disconnect that is accessible Wiihnin tc e riserfrom grade to allow for easy pump access and removal. 3. The pipe s -h mmust be sized to maintain a velocity of two or more feet per second. 4. , c a-iflvau u m t h e -p re s u re I i -, wh- e zalto-pcevs -t --i-r r--v-aeu u-m--hocki R a -U o -s-c c rain-ing-othe f Pressure Noes must be desi named to prevent air or vacuum locking and allow self draining of the pipes. - E. Access. 1 The pump or dosing system tank, chamber, or compartment tatimust have a minimum 24 -inch diameter access riser, made of corrosion -resistant material, extending to or above ground level. A smaller diameter riser may only be installed if it is accepted by the Water Quality Control Division as an integral component of a specific pry duct during the product review process. 2. The access riser must have a watertight connection to the pump or dosing chamber/compartment to prevent infiltration or exfiltration. All ther intrusio-ns to the riser for elec ncal or ot; er component access must watertight._ c��.ss also be F. Splice Box. 1. Splice boxes s� -l-rnust be located outside the pump system access riser and be accessible from the ground surface. 2. - 7 ►ire splices shall---be-flare I are prohibited inside the tank, dosing chamber or riser. Wire splicing shall r List be completed with corrosion -resistant, watertight connectors. G. Controls. 1. Control panels or other electrical boxes used to control the functions of an OW S must comply with the following, as appropriate: a. - The pump system Rmust have an audible and visual alarm notification in the event an excessively high water condition occurs. b. a The pump e-Innust be connected to a control breaker separate from the high water alarm breaker and from any other control system circuits. An electrical disconnect must be pr•:vided within the line of sight of the pump chamber. The pump system ha -H ---have at-s-�tc-hmust be provick,d with a means that will allow -so the pump toea- I be manually operated. d. The pump system for pressure dosing and higher level treatment systems have a mechanism for tracking e-it-hecboth the amount of time the pump runs orand the number of cycles the pump operates. s �L H tdd usa bear the seal of a Nationally Recognized Testing Laboratory (N TL), such as IL or ETL. ce 30-941.10, Effluent Screens. A. A. If a pump or dosing siphon is used to remove septic tank effluent from the final compartment of the septic tank, anthe effluent screen must be filtered, p-rc e - prior to the -pump _ o-r-hPrinl-dispersa l into the soil treatment area.,- -An effluent screen, pump vault equipped with a filter cartridge, or a filter on the discharge pipe, would all ---n be considered ec -an-ef cent -s- sen p -seeds g-- —pu- a cce pta b I e . The effluent screen, if used, s- ati ust be cleaned at manufacturer - recommended intervals, or more often, if use patterns indicate. An alarm may be installed on an effluent screen indicating need for maintenance. D. Wherea elector pump cinder pump or ron-clog pump is proposed for use prior to the septic tank, an effluent screen must be insta lcd on the outlet of the septic tank. E. The a dle of the effluent screen must extend to within 12 inches of grade. Sec. 30-9-1010. Grease Interce rtor Tanks. A. A. All commercial food service facilities and other facilities generating fats, oils and greases in their waste must install a grease interceptor tank. . B. Grease interceptor tanks shall treat only those portions of the total wastewater flow in which grease and oils are generated. C. The grease interceptor must have a minimum of two compartmeits and must be sized proportionate to to the amount of fats, oils aid grease it receives, the Peak flow rate t -rough the tank, and the expected cleaning ire uency. ('7 D. The inlet ana o►udet tees or baffles must extend into the bottom 1/3 of the liquid volume, but must be at least 12 inches off the inside floor of the interceptor. E. The inlet and outlet tees or baffles must extend at least 5 inches. above the liquid level and must provide for a free vent area across the liquid surface, ARTICLE x DESIGN CRITERIA — SIL TREATMENT AREA Sec. 30-10=10, Soil Treatment Area General. A. The size and design of the soil treatment area sh-a imust be based on the results of the site and soil evaluation, design criteria, and construction standards for the proposed site and OUTS selected. B. At proposed soil treatment area locations where any of the following conditions re present, the system st l must be designed by a professional engineer and approved by the Division: 1. Thecor soil di c s --aye types 9, 3A, 4, 4A, an -d 5, mO, RA and R-2, as specified in Table 30-10-1 and 30-10-1A of this Regulation; 2. The maximum seasonal level of the ground water surface is less than four feet below the bottom of the proposed infiltrative surface b-sarpti-sy term 3. A limitingire-e layer exists less than four feet below the bottom of the proposed absorption s ste yinfiltradve faCC; 4. The ground slope is in excess of thirty percent; or 5. Pressure distribution is used. Seca 30-10,20 Calculation of Infiltrative Surface of Soil Treatment Area, A. The infiltrative surface of a trench or bed receiving any treatment level of effluent is only the bottom area. No sidewall credit is allowed except in deep gravel trenches that are permissible in repairs. Long-term acceptance rates (LTARs) are shown in Table 30-10-1 and 30 -1O -1A. C. Factors for adjusting the size of the soil treatment area are in Tables 30-10-2 and 30-10- 3. D. The required area for a soil treatment area is determined by the following formula: Soil Treatment Area in square feet required = Design Flow (in gallons per day) LTA (in gallons per day per square foot) 1. Adjusted Soil Treatment Area = Required Soil Treatment Area x Size Adjustment Factor(s). 2. Size adjustment factors for methods of application are in Table 30-10-2. 3. Size adjustment factors for types of s-Fa9-e/distribution media are in Table 30-10-3. 4. A required soil treatment area may be multiplied by one size adjustment factor from Table 30-10-2, Table 30-10-3, or both. 5. A soil treatment area receiving TL2, TL2N, TL3, or TL3N effluent must be pressure dosed. Table 30-10-4 Soil Treatment Area Long-term Acceptance Rates by Soil Texture, Soil Structure, Percolation Rate and Treatment Level Soil Type, Texture, Structure and Percolation Rate Range Long (LTAR); Term Gallons square Acceptance per foot day Rate per Soil Type USDA Soil Texture USDA Structure- S. peT Soil If pe USDA Soil Grade Structure- Percolation (MPI) Rate All Treatment Levels Soil T` 1- th e —>35% Rock Single -ere -in (0)- >35% <-5->35% Rock Minimum toot deep 35-94-R-ec-k- pe (>2 -�- a m * -n T - i - --Bait- m 1 0 LIAR>35 -3 t}lt -ra 5 y i Rock -unlined d, ,. sa na See (>2mm): See Table Rock (>2.mm): See Table (>2mm): See Table 6R ° f1 7 X35%o 30-10-1A 30-10-1A 30-10-1A t' �'o (>2mm�. Rock (>2mm): See TableTable 30-10-1A 30-10-1A 1 Sand, Loamy Sand ---Single Grain Single Grain �0}_ 5-15 0.80 (Structureless) 2 Sandy Loam, Loam Loam, Silt PR (Prismatic) GR (Blocky) (Granular) BK 2 (Moderate) 3 (Strong) 16-25 0.00 2A Sandy Loam, Loam Loam, Silt 0 (none PR, BK, GR M-ssive0 1 (Weak) (Structureless) 26-40 0.50 -}Massive PR, BK, GR 2, 3 41-60 0.35 3 Sandy Loam, Clay Silty Loam, Clay Clay Loam 3A Sandy Loam, Clay Silty Loam, Clay Clay Loam PR, 01Vlassive BK, OR I i 1 assivecUStructureless) 61 w75 0.30 4 Sandy Clay, Clay Clay, Silty PR, BK, GR,, 3 76-90 0.20 4A Sandy Clay, Clay Clay, Silty I PR, °Massive BK, GR 1 M-assive0 (Structureless) 91-120 0.15 PAGE 70 2013-** ORD2013-13 5 I Soil Types 2-4A Shaded areas require system design by a professional engineer. 1 Treatment levels are defined in Table 30-6-3. 9 Unlined sand filters in -these soil types-shall-pr-eii4e athogen rem-val:---Design shall c-snform to Section 30-1-1-30.B.3., Unlined -Sand Filters. able 30-10-1A Design Criteria for Soils with Hi r h Rock Content (Type "R" Soils 1,2,3,4 Soil Type, Percentage of Rock, LTAR, Distribution Require° Sand or Media Depth Relative to the Quality of Effluent Applied to the Distribution System Soil Type _ Percentage and Size of Maximum LTAR (gal/soy Type of Distribtion Treatment Level 16 Rocks ft/day Required R.p0 Soil Type? 1 with more Unlined Sand Filter: 1.0 Pressure Distsribution8 Minimum 3 -foot deep than 35% Rock (>2mm) for "Preferred Sand Unlined Sand Filter Media:, 0.8 for `Secondary Sand Media" Pressure Distribution8 Minimum 2 -foot deep R-1; Option 1 Soil Type? 2-5, >35%- Use TL1 LTAR from 65% Rock (>2mm); Unlined Sand Filter Tab e 30-10-1 for the With >50% of the Rock soil type corresponding <20 mm (3/4 inch) to the soil matrix with a maximum LTAR of 0.8 The allowable LTAR's Pressure Distribution8 Remove, mix, replace 4 R-1; Option 2 Soil Type? 2 and 2A, >35%-65% Rock are defined in each feet of existing material (>2mm); With , >50% of individual treatment with a maximum LTAR the Rock <20 mm (3/4 levelcolumn in this table inch) R-2 Soil Type? 2-5, >65% Timed, Minimum 3 -foot deep Use TL1 LTAR from Rock (>2mm), OR Table 30-10-1 for the Pressure Distribution8 Unlined Sand Filter >50% of Rock >20mm soil type corresponding (314 inch) to the soil matrix, with a maximum LTAR of 0.8 PAGE 71 2013-** ORD2013-13 1. General guidance for Table 30-10-'1A: The intent of the soil type R-0 is to define a material that consists of a high percentage of rock, or rock fragments, and has a percolation rate of less than 5 mpi. Soil types R-1 and R-2 consist of a high percentage of rock or rock fragments, but have a percolation rate of greater than 5 mpi. Soil types R-0 and R-2 are considered to be a "limiting layer". 2. No sizing adjustments are allowed for systems placed in type "R" soils. The maximum LTAR's are provided in this table 3. The design of type "R" soil treatment systems must conform to sections 30-11-30.B and C. 4. All systems installed in a type "R" soil must be designed by a professional engineer. 5. The percentage of rock may be determined by a gradation conducted per ASTM standards, or an appropriate field evaluation by volume. 6. Type "R" soil treatment systems that are designed per the criteria noted in the Treatment Level 1 column of this table do not require 0/111 oversight by the LPHA. 7. The "Percentage and Size of Rock" column references the soil types noted in Table 30-10-1. Design of the pressure distribution system for type "R" soils shall comply with the requirements of sections 30- 11-30 B. 2. a, b, c, d, and e. Sec. 30-10-30. Allowable Soil Treatment Area Reckicti ms-- = -- ,ese S izti n � Adjustments. A. The soil treatment area size determined by dividing the design flow rate by the long-term acceptance rate may be adjusted by factors for soil treatment area design and type of distribution media. B. For the purpose of the table, a "baseline system," i.e. adjustment factor of 1.00, is considered to be Treatment Level 1 (TL1) applied by gravity to a gravel -filled trench. 7 e -m iru Fc dui cun$co 6 he ob"9' B e a re f d- _ t o o" n" d-sG�"' _ �" .'mo o an 5 0 t r-ce 1 t -of-the asl--i~ e -s- ern-rq u-i e dfer Table 30-10x2 Size Adjustment Factors for Methods of Aplicatif:ln in Soil Treatment reas Type of Soil Treatment Area Meth d of Effluent Ap , Head=• n frm Treatment Unit Pre cea}ing Soil Treatment Area Gravity Dosed (Siphon or Pump) Pressure Dosed Trench 1.0 IA 0.8 Bed 1.2 1.0 Table 30-10-3 Size adjustment Factors for Types f Distribution Media in Soil Treatment Areas 1O2--/ Type of Stora *istribution Media Used in Soot Treat ent Area Type of Soil Treatment Area category korTire .o [ruts ther Manufactured edia Qt - r T- 9 - Cars as7ateciont3 • Chambers or Enhau ced anufactured MMeda Trench or 1 OS 0.7 1. All proprietary distribution products must receive acceptance and the applicable reduction through Colorado Water Quality Control Division review per the applicable requirements of Regulation 43 section 43.13. Sec. 30-10-40. Design of Distribute n ^ y temsa A. General 1. The infiltrative surface and distribution i n -e' laterals must be level 2. The infiltrative surface must be no deeper than four feet below L rade unless -adequate ' '��* "�3 � � � � a"°� � •.��. � �� A �� one � �'� �t"� 6 �_ G a �= � � a � _y, f �._� �-^'-� '7 3 4 s� 2cd"ee p r-" ;�.+ r� "a n o e i_f_'- del a a �i -i-s � �1„'p'r ,ter - 1 '- The depth of the infiltrative surface will be measured on the up -slopes Am -Sops side of the trench or bed. 3. Trenches must follow the ground surface contours so variations in infiltrative surface depth are minimized. Beds must be oriented along contours to the degree possible. 4. Pipe for gravity distribution must be no less than three inches in diameter. 5. A final cover of soil suitable for vegetation at least ten inches deep must be placed from the top of the geotcxtile or similar pervious material in a rock and pipe system, chamber, or manufactured media up to the final surface grade of the soil treatment area. 6. Following construction, the ground surface must be graded to divert stormwater runoff or other outside water from the soil treatment area. The area must be protected against erosion. Subsurface drains upslope of the soil treatment area may be installed to divert subsurface flow around the area. Subsurface drains must meet the minimum horizontal separation distances from components of the OWTS as specified in Table 30-7-1. 7. Backfilling and compaction of soil treatment areas sh-atimust be accomplished in a manner that does not impair the intended function and performance of the storage/distribution media and soil and distribution laterals, allows for the establishment of vegetative cover, minimizes settlement and maintains proper drainage. /,s 8. Dosing may be used for soil treatment area distribution. The dose must be sized to account for the daily flow and the dosing frequency. B. Distribution LinesLaterals; Must meet the requirements of section 30-9-40 as applicable. 1. Distribution between 4n -es -laterals in a soil treatment area must be as evenflevel as possible. Uneven settling of portions of the distribution system following construction must be addressed by provisions in the design to adjust flows between lineslaterals. 2. 4ribu io-n--lanes sh-a-1 —b a -The maximum length of distribution laterals must not exceed _ of 150 feet-lo-ng. --Distribution lines laterals longer than 100 feet shallmust be pressure dosed or the application of the effluent s-hal-It-lust be at the center of the Unelateral through a distribution box. 4. For absorption beds, the separating distance between parallel gravity distribution laterals must not exceed six feet (center -to -center), and a distribution lateral must be located within three feet of each sidewall and endwall. 5. 4. The end of a distribution pipe must be capped, unless it is in a bed or trenches in a level soil treatment area, where the ends of the lines may be looped. 6. To promote equal distribution to the soil treatment area, the forcemain or effluent pipe must be connected to as near to the middle of the distribution header as possible. However it must be offset from any distribution lateral to prevent preferential flow. 7. Orifices must be oriented downward unless pressure distribution is used and provision for pipe drainage is included. C. Pressure Distribution 1. Design of pressure distribution systems must include: a. Dose size and frequency for either proposed flows and soil type, or media long- term acceptance rate; b. Pipe diameter and strength requirements; c. Orifice size and spacing; d. A 30 — 72 inch operating head at the distal end orificeL e. Pump/siphon information; Total Dynamic Head; gallons/minute; f. Drain -back volume from forcemain; and Calculations, or a design software reference, that indicates the selected component sizing will provide equal flow within each active zone of the distribution system, and provide no more than a 10% flow differential from the initial orifice to the most distal end orifice within each zone. pines in a pressure distribution The separating distance between parallel distribution � �� aosortion bed must not exceed four feet, and the outer distribution pipe must be located in two feet of each sidewall and endwall. Specific requirements for the design of sand filters are noted in section 30-11-30.B. 3. Flushin.., assemb ies must be installed at the distal end of each [ateral and be accessible from finished grade. A sweeping 90 decree or bends limited to 45 degree must be provided. a--An-i-nrs-pect-i--an--pachaecessib-le = c r- h�� d-s �- -a e ti u - � e - �s r § B i a and of each -41 -pre.- T a tom ---o h -e I -n o act i on- - b -e -m must—extend--to--the .9 9 5 4It F'ativ 'idi- c e a - Rat d be _ 'SOS on N-ct eeV,d' - the `moo• 7 5 r f h ''�Z�:d.._-_d 1-st too B 9 _ pE e. n 4a -1 -US - oo rd. 6 a —to rn-anutia-c-tu-res lna -o-i- r c i= e --i n fi` e- a e s v1sibl aar -n- be -measured -r rn the B in s pectu ion--por :Ad i=t l i n -s- o� fl- ores-- n-n-ecte--t-o-di-st4 i u= d -n-p i- e-i o a 1 c. T1-p--on=i- &-p e ki-o-n-po4s-ma3 bf-- e o 4 t .rye -o ` h e s u 4 c 4 e c h a -cover a- re -surface Seca 30010-50 Soy Treatment Area Re A. . Trenches. Trenches must be three feet wide or less. The separating distance between trenches must be a minimum of s-ifour feet sidewall-to-sidewall. aireme nts 3. a l-efrat--dDistribution pielaterals used in a trench must be as close to the center of the trench as possible. . Recto-ratio-Rs____.mn a--b-e-O n:ua ted-d c wftwa FcPd n -pr -Fe—distribution is U-sed-a-n pcovi-� n for i- e-,--dmtn-a-g - -- -c-P 8e - B.7. Beds. 1._a. Maximum width for a bed snail be 12 feet, unless the bed receives effluent meeting Treatment Level 2 quality or better. .- The separation distance between beds must be a minimum of six feet sidewall-to-sidewall. T -n -e--- = -9 _-di-stance- t 64 in —an -a b -s r pt inn----bed- mu-st--not--eyce4e s-i-eSan_d _ a-distri-b-uption-fn _ - a p b t b•ti -bsa�� wi_t hi -y Leo feet -of sac h - -a44- -d--e-n-d w atke-f-t h-e---ab o -r- tion bed, C.& Serial and Sequential Distribution: 1.a. A serial or sequential distribution system may be used where the ground slope does not allow for suitable installation of a single level soil treatment area unless a distribution box or dosing chamber is used. 2.b. The horizontal distance from the side of the absorption system to the surface of the ground on a slope must be adequate to prevent lateral flow and surfacing. 3.c. Adjacent trenches or beds must be connected with a stepdown/relief tiepipe or a drop box arrangement such that each trench fills with effluent to the top of the gravel or chamber outlet before flowing to succeeding treatment areas. a. _ S4o-ra-‘454-gistt io n lea -e�d-i-a- p -rr - t b u rrounde- -b" clea; -a -e-d-g -;, e, _ roc, err -other m a 4 i-of e -l. efficiency wh-icii-may-nra-n e -n-si e -- - h o- i- i n es - e--s4-shx- hes of , a ar--m teri amust be- d a e -be - e --p .p -e. - ,e -g e -rock---o =-o=no -c -teb l- - -fill the try hh--ar ounahe pi n d --at I -e -st--i-es-a-b vee- o -f- e d- ,rhb-uti c pipe; o—o--fthe ace d l srmaa- -Fe-gse - x -4i -l- - o -r egwva e--nt- er we -u -s --m e- i-a --� - e - su The _ a --fib ; -.ter. a en dec- - h clean, unit- . Ti -re -c i-ps -mp st be em—i- tl x, gw .-o-f n-e-d-i-r -oti • n • ve l or such nn -r 1 us- d- -m -st o n-wog-en In a --maxi mu - n , l -i- n-ee-s _ a -iof 2. - u ce -p q u-ace-yeard e � �m-u n el -be - sdT in -size -and -may -range -from UM -pi _ cMo-a-m ax mu m C . \A4re s r ° S-- o US4-n t < r..� - de- 0 th -e- ica has -r -e--, - a -n -Q i nc 1- 36- i rye G h4 -p that-be-free/4r° m --b 1- --o-f-v-e- an -f -e 1r _ i-e s [ es --Mh-a X1;1: o -m mro€ s . e h e top -of -the -ti -re c N-p-s--ise-m-uvs4-- v e r- d- i- ft n aweven perm a - e -g e ote _ of le . S- ins - -m i- u ;- ckne --rt' ----oQ- n ---es- r Aare _ y as r iq \ � a sn t pervious mate - L --A - r gym- i-o-u-s- -Dave-ri-n-g-- -� R-ot-b - d �L b. n o-n--PliPd _ S a -e oo- ° 4 o- '�a n -u a- ture-r--' s- nst-r u c c. F sauant- m -b g -r y a �� u u . __M e a, a, M do -t d--meeli-a-mu- b --4 s i- ed s 1-e Is n the---i- I b . I n_sta-l-1 t-i-o-nom s4 -b -e-' o g, of a -d ure r' -ir uc r n e E ruent --may—: o--pli d by --pc-e ur-e—d4s-t butio-n -� s -u -i4 _b -it -of-- t- e--\A--ethet-fer-t-hat-useT -, ------ 1-) se --s a za-a-nd -s ur-e - 1 ri_biat sa3,.�to '— ' Y C,i s-- hi � 1� i"Er t we udace t he --n a- " - -r—spec i f e �-$ - - Rd -s -o k-- - --m=om dia-ll-en-_ & a a- se- -t- ;- 2)— Pine cJ4 meter- a -n -d -h a a a 's m nat s and b l elan outs rn a s -t -fi e--i-n a -1 l _a .the -e cLof e ash-kn a. 1 he n Y rat t o-- s-u4a e-a-rsa-mustbe-oa 1 - t-h� ova m o e oo, a u - era r- -comk-mend- d-- - t e-r-acce-$-n-ce =soc �t e a n to=e . . A -manufacture re r' 09i -n o -ti se" r Y'i+_5`e R4atio-FI :— c -D _ r-a-i-n-b-ek-be pcev- -mod- -r- ! d. Provisions -.n u--+ valves; and-- con ng n the --d . - m tb � o � - p ; , _ r-e- �'? '�.o b b-' - •� ...m � bs ten-1-67 Pre-vJ E s'9 -e -n s ---m jam' 'bide 1 a 9 f o ac• ''® `d�'J d d S Y�L� 6 f -L san•��i-b a Ae-r-natir li u D.A. Alternating Systems. 1. An alternating system must have two_or more zones that must be alternated on an annual or more frequent basis. 2. For repairs, each Jea-c-h section must be a minimum of 50 percent of the total required soil treatment area. Size _ adj-ustm-en.t fa - -for toe--of-distribution m -s h> not -be lower -For new installations, each separate soil treatment area must meet the rninirnum sizing requirements of this regulation. 3. A diversion valve or other approved diversion mechanism that requires the owner or operator to manually alternate zones of the OVVT S may be installed on the septic tank effluent line allowing soil treatment area sections to be alternated. 4. The diversion mechanism must be readily accessible from the finished grade. &E. Sequencing Zone Systems. 1. Sequencing zone systems have more -than two or more soil treatment area sections that are dosed on a frequent rotating basis. 2. Where soil conditions are similar between the sections, each section area hai4mus�{ be the same size. If soil conditions are such that long-term acceptance rates are different, each section may be sized for the same dose, but different long-term acceptance rates. 3. An automatic distribution valve must be used. 4. Dosing of each system must be evaluated by the design engineer based on projected daily flow rates, number of zones, and soil types. F. Inspection Ports 1. A 4 -inch inspection port accessible from ground surface must be installed at the terminal end of each lateral in a trench system and at each corner of a bed system. nie bottom of the inspection port tube must extend to the infiltrative surface and not be connected _ to the end of the distribution pipe. 2. Inspection ports in chambers may be installed accordig to manufacturer's instructions if the infiltrative surrace is visible and effluent levels can be observed from the inspection port. 3. Additional inspection ports connected to distribution pipes may be installed. 4. The top of the inspection ports may be terminated below the final rade if each is housed in a component suct as a valve box for a lawn irrigation system and has a removable cover at thes qro!, nd surface. 30-10-60 Storage/Distribution Media A. Rock and Pipe 1. The perforated pipe must be surrounded by dean, graded gravel, rock, or other material of equal efficiency which ma\range in size from 1/2 inch to 2 1/2 inches AASHTO M 43 size No. 3 coarse aggregate meets this specification. 76( 2. least six inches of gravel, rock or other material must be placed below the pipe. The 9 ravel, rock or other material must fill around the pipe and be at !east two inches above the top of Rohe distribution pipe. 3. The top of the placed gravel or such material used must be covered with nonwoven oermeable geotextile meeting a maximum thickness rating of 2.0 ounces per square yard or equivalent pervious material. An impervious covering mist not be used. B. Chambers 1,i Chambers must be installed with the base of the unit on in -situ soil or, if placed on acceptable media, the manufacturer's installation instructions must be followed so as, to prevent chambers from settling into the media. 2. Installation must be according to manufacturer's instructions. Effluent may be distributed by gravity, pump or siplion. if the width of a proprietary manufactured distribution product is within 90 percent of the width of the excavation, it may be approved as being ec uivalent to the full wic th of the excavation; if information is provided that demonst4retes distribution of the furl witth. Thus, the product must cover at least 90 percent of trio excavated area in either a trench or bed configuration in order to receive sizinajustments provided in Table 30-10-3. C. Media, Enha cad, or Other Manufactured 1 Manufactured media must be installed with the base on the in -situ soil or placed on c ,eptet e media meeting the manufacturer's specifications for proprietary distribution products or combined tr eatment/distr ib ition products. 2. Installation must be according to manufacturer's instructions. 3.Pressure distribution is require for F L2- l -3N effluent, unless otherwise noted in this regulation. D. Driplines . The infiltrative surface area must be calculated using the long-term acceptance rate for the site or a r< ore conservative value if recommended by the manufacturer. Driplines must be installed on manufacturer's spacing recommendations. �P JS T Foy (+ must Drainback b provided for all drip lines pipes an a pumps. 4. Provisions must be made to minimize freezing in the distribution pipes, driplines, relief valves, and control systems. Provisions must be made for 3'ol :eriu back-flushin _ other cleaning. Tire Chip. 7� 1. The pipe may be surrounded with clean, uniformly -sized tire chips. n 1. ire chips must be nominally two inches in size anc nna .-an e from 1/2 inch to a maximum of four inches in any one direction. 3. Wire strands must not protrude from the tire chips more than 0.75 inches. 4. Tire chips must be free from balls of wire and fine particles less than two mm across. 5. The top of the tire chips used must be covered with non -woven permeable geotextile meeting a maximum thickness rating of 2.0 ounces per square yard or ecuivalent pervious material. An impervious covering must not be used. sec. { asigi 1, r ra ose - - - 0 De si-n-g—m S-USS4O Sole--tr a4msflt-a rsa - _ rr UtI O -n . yhe's- ust --b e -sized -t a— c count far the d a i -poi Prat - ' he 11 " _e c --y- s Q3' ii g-s`s se B G s-§' f' ug Sec. 30-10-7079. Lift Stations. Lift stations intended solely for the purpose of delivering sewage to a septic tank or septic tank effluent to a standard pre-n--s-n-cAn-e-e-Pred soil treatment area that is located such that it is not possible to provide gravity flow from the septic tank to the soil treatment area are not required to be designed by a professional engineer. The systems installer shall submit to the Division a pump information form, provided by the Division, for documentation. Sec. 30-104080. Soil Replacement. a ga emen�-perrn-i-t-te-Pt o--i-ir �- the soil with-4pe e -rte ci utremen✓ f .QQ Ad , d -s o - -t -s c i a t -o n s e- -�--$ -ft - ; ars e ��fl� n Section n - ' �-tl 1- Odl. t- i-ac Ls `L' krau- �Ge"�.d' 9�8 i !� Cr ' s eity-s-fie' bb l 0 ar to i n aq-a tl n-of- c-' nr— f t� sLs-s-es he d -a n p-p-co'v. y t e 493j g n-'e-n'gEn-r ear . d c e o 4 n gr �--�� - o- = r sand- f efi-m-p -t-eus-ems- s r i-sr-i-b-u- R--,mus be -use- The construction of a soil replace rent system is permitted to orinq the soil treatment area into compliance with the requirements of this regulation 1. Vhen a soil type "R" is rcmoved the followiu a requirements must be met: a. All added soil must comp! with the following !pecifications: (1) Added soil must meet the specifications of either "preferred" or "secondary" sand filter media, as specified in section 30-11-30 8.4. (2) The long-term applicable rates as specified in Table 30-10-1A must be used. No additional sizing adjustments are allowed. The depth of the added media must comply with the requirements of Table 30®10-1A. (4) A gradation of the sand media used must be provided. The gradation must be dated no more than one month prior to the installation date. However, a Gradation of the actual matecia placed in the excavatioi is recommended. (5) toll added soil must be cmpleteiy settled prior to installation of components as specified and approved by thc design engineer. f6) Pressure distribution must be used The remove and reinstallation of in -situ soil may ondylose allowed where the soils are determined to De a soil type "R-1" (Option 2). The design must comply with the requirements for this soil type noted in Table 30-10-1A (Soil Type R-1, Option 2) 3. When a sand media is added to soil treatment area or to an excavation where a soil tape 1-5 (Table 30-10-1 S m e t. : is the underlying soil, the following requirements must be 'n p�qn �,'v�} must 5_� yry specifications AC e7 _J y�pp {_ a,� g� flreferred"npe�p�p`�.y!pry._`p�,pa. Addedsoil meet lShe specifications o Y e o r "secondary" , s a n d Niter media, as specified in section 30-11-30 BA. Unless the design follows the criteria for a sand filter or mound system des �„_s required in section 30-11-30, the TL d lone -term acceptance rate for tl e receiving_ soil must be used. c. A gradation of the sand media used must be provided. The gradation must be dated ono more than one month prior to the installation date. However, as radatiokn of tl e actual material placed in the excavation is recommended All ad ded sod must be completeh seWed prior to installation of components. Sec. 30-10-190. Repairs. A. When space is not available or if there are other site limitations that preclude other soil treatment area options for OWTS repairs, wide beds deep beds and deep gravel trenches may be considered for repairs only. Other options are vaults (in accordance with Section 30-12-40) or higher level treatment systems. Repairs to failing systems must conform to setbacks identified in Table 30-7-1 when possible. When this is not possible using all available methods described above, the jurisdiction with authority gay permit redLctions to setbacks. At no point will a setback reduction be approved by the jurisdiction less than what the existing separation is to existing OWTS. In maximizing this setback distance, all methods available in section 30- 10-00 A. must be utilized including but not limited to the use of Higher Level Treatment, wide beds_, etc., where allowed. Any setback reduction beyond wnat the existing failing system presents must be approved by tie local board of health as outlined in section 30- 4-140. Cala Wide Beds: For repairs, beds may be wider than 12 feet without being required to receive effluent meeting Treatment Level 2 quality or better. D. Deep Beds: For repairs, the infiltrative surface of a bed may be no deeoaer than five feet. Size adjustments as provided for in Tables 30-10-2 and 30-'0-3 must not be applied. System sizing will be based strictly on the soil type and corresponding LTAR. E. C. Deep Gravel Trenches. 1. The length of an absorption trench or —bed may be calculated by allowance for the sidewall area of additional depth of gravel in excess of six inches below the bottom of the distribution pipe according to the following formula: Adjusted Length = L x (W+2) OW+1+2D) Where: L = length of trench prior to adjustment for deep gravel W = width of trench - in feet D = additional depth in feet of gravel in excess of the minimum required six inches of gravel below the distribution pipe 2. Maximum allowable additional depth is five feet. 3. Percolation testsand-- -- - i e—hrol or soil profile test pit excavations.--tc evaluations must be performed at the proposed infiltrative surface depth. o-fife- o-r-i- ion-- , be o,- l-I-or.e-da r -e.-u1, 2016, 4. -- - S min e-ki i-z-e ara _wfth$eh- u ,-se-was.- 4 sSize adjustments as provided for in Table 30-10-2 and 30-10-3. must not be applied to deep gravel trenches -teems. F. Wastewater Ponds 1. Construction of new wastewater ponds is prohibited. 2. For repairs of an existing wastewater pond, the potential for risk to public health and water quality may be evaluated by the local public health agency. If risk is low in the determination of the local public health agency, the repair of a wastewater pond may be permitted, however the following criteria must be followed: a. A septic tank must precede the wastewater pond. b. The depth of the design volume of the wastewater pond must be at least five fee c. A wastewater pond must have two feet of free board above the design volume of the pond. A wastewaters must be fenced to keep out livestock, pets, vermin, and unauthorized people. Wastewater ponds must be designed on the basis of monthly water balance including design flow, precipitation, evaporation, and seepage. f . Wastewater ponds must be constructed so the seepage out of the bottom or sides does not exceed 1/32 of an inch per day. If this limit cannot be achieved u sing compac ed natural soil materials inciudin n soil additives, an impermeable synthetic membrane liner must be used. g. If the evapotranspiration does not exceed the rate of inflow of effluent from the structure, a soil treatment area meeting the requirements of this regulation must be installed to accept the excess flow. h. Maintenance must include preventing aquatic and wetland plants from growing in o r on the edge of the pond, protecting sides from erosion, and mowing grasses o n the berm and around the pond. i. Wastewater ponds must be designed by a professional engineer. r -1-G. Vaults. 1. The allowable use of vaults for repairs must meet the criteria specified in Section 30- 12-420 of this Regulation. Higher Level Treatment Options. 1. Design criteria for higher level treatment systems are in Article XI. ARTICLE XI DESIGN CRITERIA - HIGH LEVEL TREATMENT SYSTEMS Sec. 30-1140. General. A. Higher level treatment systems must be designed by a professional engineer. B. Higher level treatment systems may be public domain technology systems or proprietary systems. 1 Public domain technology systems must be designed, installed and maintained according to established criteria. When design criteria are not specifically provided in this Regulation, the criteria used in the design must be from a reference commonly used as an industry standard and the criteria must be cited in the design. 2. Proprietary systems must be designed, installed, and maintained according to manufacturer's instructions and must have received review and acceptance by the Water Quality Control Division. C. Soil treatment areas for higher level treatment systems must be pressure dosed. D. Systems must be capable of accommodating all anticipated flows and organic loads. E. Ventilation and air systems: Mechanical components must be installed in a properly vented location and all vents, air intakes, and air hoses must be protected from snow, ice, or water vapor accumulations. ��3 F. Covers, barriers, or other protection: All systems must be installed to include protection of openings against entry of insects, rodents, other vectors and unauthorized people. Sec. 30-11=20. Treat.: 4r nt Levels. • The treatment levels identified in Table 30-6-3 are specified in this Section for public domain technology, and proprietary treatment systems be assigned a treatment level approved by the Water Quality Control Division. Adequate maintenance and operation plan as required by the Water Quality Control Division must be submitted to the Division. Sec. 3041-30. Sand Filters. A. dmU Sandrifle-isms as -a -A lined or unlined intermittent sand filter,_ or recirculating sand filter, may be used as a prehigher level -treatment system wi sP the -t- a4e -e4P nt i-poisect- d----a-n- --spe-mod to a prior to dispersing the effluent into a soil treatment area gar wh-erell-notects-Wern-,-, e sita ₹ uo a - a -n -gird ad -ndit -a Intermittent (Single Pass) Sand FiltersjGeneral Re uirements- 1. enera9 T �g �.�° dr + � a €Py� '� f�' e � 'L...h 8 �'' � �u A � �, �� P� ,��' � � � � "� i-B N' a � f b' -� 1 1 t c F ~` 9-Y � e� d"� o mamas `S eV_�o_`_arn , arsoce,e-n---haAlin ur meshes -to . -inh . The -sand t betwen Q- ane s" rn m.; --f '-heas c oe ! is mr f1 -a 6 b — 4�3 --Q--a !eadds. M p ss-i ��--- b The s n n- e -1 e- o Crib- -R- 14-ni—m . 4- w h ----o- e- e ro$e t �wefeee-deep: - - D-i- ,- r s-a..i_ot- ftu 9t= e dda -c-e- -f h s -na-fi i-te -u s»' b 4l-is4Fi_buti.on.-system=i-or -u a -1 --d- - i-buko-n . 2-) P _ ----usS 4-Srs -h a!-uenr- ' u '. `°,e s 9:-ci-n4e-d-by_ w &; edGear-,e s -cc n- d G m s he 4 St n -11-&f ' e- g Pas ve k -r-st-o-n- ---m-use a-&-s--a- - -2 jr h- s c -r . -a n- ---ust—be- ° t - - -- 4 c 2\ V a -Y` ufa ct b � 4 d Si _ a - w -be -used- used -ass n- -maw e-1--�° r �_ ki ..s :, . `tf -rati-en-d-ist- -Ge -atween Pa rata a -e nes m- s- - t-exe e-s-i--S f e t any--- wa-lb e- l -co t e -w-'h4 three ea o -e-ac h filter The treatment level for intermittent sand Me s is considered TL3. 2. General Design Parameters: Not all combinatio is of the variables noted oelow will result in a proper distribution system design. The design engineer must ; ustifi through calculations or design software that the selected vales will concur with industry standards. Distribution pipe size: /4 inch ® 1.5 inches 0PVC class 200, min.) 2 inch distribution pipe ma onlbe used where other design modifications cannot overcome a greater than 10% variation. in the pressure head between the initial and distal orifices. (2) Distribution pipe spacing: 18 inches — 48 inches (3) Orifice size: 1/8 inches — 3/8 inches (Also see section 30-11-30 E.1. below) 4) Orifice spacing: 18 inches - 48 inches (5) Operating head at the distal end of distribution pipes: 30 inches — 72 inches (60 inches typ.). Larger orifices allow for an operating head at the lower end of this ranggo, while smaller orifices will necessitate an operating head at the higher end of this range. 3. Dosing: a. Pressure distribution is required. The design of the distribution stem must also comply with the requirements of 30-10-40 c.1. b. Number of cycles/day: Will vary with design Short, frequent doses are preferred.) c. Proposed dose volume: Will vary with design (0.25 - 1.01nalionsiorificeidose, or 3-5 times distribution pipe volume d Timed d sing is recommended where design considerations allow. . Sand Filter Treatment Media The depth of the sand media below the distribution system must be at least 24 inches unless otherwise noted in Table 30-10-1A for type "R" soils. b. "Preferred" sand media requirements: (i) Effective size: 0.25-0.60 mm (ii) Uniformity coefficient: ≤ 4.0 (iii) Percent fines passing #200 sieve: ≤ 3.0 c. "Secondary" sand media requirements: (i) Effective size: 0.15-0.60 mm (ii) Uniformity coefficient: ≤ 7.0 (iii) Percent fines passing #200 sieve: ≤ 3.0 d. A gracation of the sand media used must be provided. The gradation must be dated no more than one month prior to the installation date. However, a gradation of the actual material placed in the excavation is recommended. 5. Gravel Requirements a. Clean, graded gravel, or rock, must range in size from 112 inch to 2 1/2 inches. AASHTO M 43 size No.3 coarse aggregate meets this specification. (i) The gravel must surround the distribution pipes used to disperse the effluent and must be at least 6 inches below and 2 inches above the pipes. (ii) Water Quality Control Division accepted manufactured media may be used as an alternative to specified gravel. 6. Filter Fabric Requirements (i) The top layer of gravel must be covered with a non -woven permeable geotextile fabric meeting a maximum thickness rating of 2.0 ounces per scuare yard or ecuivalent pervious material. 7. Final Cover Material a. 8 inches — 10 inches of Tvoe 1 or 2 soil with an additional 2 inches to o soil 8. Size adjustment factors provided in Tables 30-10-2 and 30-10-3 are not applicable for sand filters. 9. Sand filters must not be used to treat wastewater that does not conform to TL1 treatment level or better. d. Appl i-ca=ion--Rater: A maxim -urn sand filter application -rate -of 1.0 gpolft2 must be used. -.-- 2) An intermittent s -an -d --fitter must not be used to treat -wastewater that does not conform to TL1-treatment level or better. 2. Lined Sand -Fitters. a Lined sand fi-l+ v -n---impeP40u-s-I-iner on the sides and b-o6tom of the f t -e -r --The liner must consist -of -a 30 mil -thickness PVC m b . m - -o wi d-nc h d i a me- er rain pipe must be -used. The -under -drain pipe must be -s - oars -o screened gravel or crushed stone. Ali of the gravel -or stone must pata-re- a i-ned on a 314 -inch -screen. --M a-n-ufao-used-media--, a -e used--a-s-a lte mti-ve-to g- aveI or s4 T ?.? c --JJ-n _ d e -p - d=a, kreffl-u- gin--oo-a l s to -- w -the- s -a n- i-lter—Sa- - e—dis pose ---t o a S-0:14 try--atmen. area - c. 0. water -u's a-oe or tai tallations i- t -h- All requirements for 30-11-30 a 1-9 will apply to Unlined (Open Bottom) Sand Filters. he bottom of :the s an d ,i i it & r us= -e%n_o_ es , h a n woos-et--aabo `4h -e hi -h-g mu -mod later downward 2. App 3. icatio Pc rates: lined sand filters. l raximur hydraulic loading rate for TI 1 efflueht applied to "Preferred Sand Media" in an Jr o led sand P. i ter is ` o gal./scjlt./da\L ®r the long= term acceptance rate of the receiving soil for T ``l (Iab e /r-1) w icr' ever [resJits O1 �� tT e arge area. Co. MiaAmum hydradic loading rate for _T l I effluent applied to "Secondari Sand Veda" in an J fined sand filter is 0.8 gal./sg.fliday, or the lore term acceptance rate o f .the receiving soil for T L, Tao e 10-1) iOchever resu is On the arQ]er area. c. IMa ximu hydrae oadOng r e for L2N, a or 3N effluent applied to "Preferred" or "Secol ��ol ufy" Sand Mec oa in an unlined sand fi e ter m us'G be the Ion tern l� acceptance rat, of t �e receOMOng soU for TO ab 10= nd filter is to � Sectinri 3 BAR of the reooi in oil, wh-frtheNer is greater. The upperinfi trasive firface of an unlinod sand 'after ter receiving TL1 o TL3N effluent must be at least three feet above a I _ rnohr later. oned Sand Otters AM l re 2. App 3. U ore rents of 30= ication rates: 6 =30 8.1-9 will app y to unlined sand filters. a. H jdraulic loading rate for TI 1 effluent applied to "Prefe lined sand filter is 1 0 gal./Kieft/day. b. C fine ydraulic loadingg rate for TLl red Sand Media" in a effluent applied to "Secor udary Sand Media" i fined sand filer is 0.8 gal./sq.ft./day. ninimu m depth of the sand media in a li ed sand filter must be two feet. 4. An On y :e aye between the sari dfi r of pea grave , two inches in thickness, must be placed to f' media and fre course under -drain media to prevent ne Horatian of sad into the lower la\ er of and a coarse ac grec ate i Teets this specification. er-drain caravel. STlM C 33, No. 0z a ,m r=inch diareter slotted SCH4O PVC jnder-drain pipe must be used to co lect the ttated affluent. The under -drain pipe must be installed it t flee cer utor of a 5 inches thick bed of washed, graded gravel, or rock raniging in size from 1/2 inch to 2 112 inches. AASHTO IV 43, No.3 coarse aggregate meets tnis specification. f. Lined sand filters must have an impervious liner on the sides and bottom of the filter. The liner must consist of a minimum 30 mil thick PVC material or equivalent. 6. Effluent collected by the under -drain must be dispersed to a soil treatment area. The soil treatment area may be sized with a maximum long-term acceptance rate of the receiving soil for TL1 effluent. 4. Mounded Sand if ers (Mound -Systems). a. When the infiltrative surface -area of th-eabove the natun-ground--sr-fa-ce, the- s -s e -t ,a-i-3--oesonde d a mounded -sand f- biy r o u nd ed s bet am) --aid-- ter- - conform to Section 30-1.1 The basal -area and linear load-ing rate must for the so- -pe-under the mo n -d -a -n -he slope of the site. d (open d. The -final slope of the mourTd--m-u-s4-4be no greater than three feet horizontal to one fo-of-v-e- e he surface o -n shame-mou ee-i-area must -be planted with a su-itable vegetative cove- . C. Re4i-rcu l aj 1. A--rsc-i-coin-at-i-- t ter _ must i '5 ve-a - i 9-§ +' -$-v IOU Ii -b 8er c n---- a- "e -- n..GLL _'a o in -of thee -filter. Th-e--i -n-e r must cons-isto-f-- m1I- i=o- -e s -s -PVC m -ate- is I or e -u-iva-I-e-n -t- minimum foc -n-eh diameter--rider-drain pipe mu-st-be used. The u -n -der f -iLn pe -must be surrounced by washed -coarse screened -gavel or crushed stone. _ Ald of the gravel t- --pans s a 2 1/ i-n c h- s c r -e en- n~--rn-u-st be ret a i n et--an--a-31--i-n-c-h s- -e-n . MaManufact-u red rr i-a--m-be--u e�--a-s-m -i4e m -a i ve-to gravel -o r- tone . R i-I-t-e-r rr� i- -ef iye size /_n�Ln1 g from 1.0 to 1.50-m- ,-Rd-nt h e --u- n if o rm ity Go-fficieint (D60/O10) must be4ess than 1 F -in -es pass - no be --1 e s s -tnan--pe-rc e n t. and--d-e-pt-h- - s-a---m-i� gib- _of -two -tea. 5.0 gpd/ ft2. mate must not exceed 5.0 gpd/ ft2. 5. Desig-n rer-circulation ratios may be 3:1 to 5:1. Eff u eit col Iecte- a ro-m-= he-i,aa-e -m u -t -bs discharged tom so ! treanaLare-a . E. Recirculating Sand Filter, Minimum Requirements: 1. Treatment level: - s eve must Treatment level provided within recirculatinq sand filters is 113 g 9 (i) General Design Parameters: Not ali combinations of the variables noted below will result in a proper distribution system design. Engineer must justify through calculations or design software that the selected values will concur with industry standards. b. Distribution pipe size: 3/4 inch — 2 inches (PVC Class 200, min.) c. Distribution pipe spacing: 18 inches — 36 inches (24 inches typ.) d. Orifice size: 1/8 inch — % inch e. Orifice spacing: 18 inches — 36 inches (24 inches typ.) f. Pressure head at end of distribution pipe: 24 inches — 72 inches (60 inches typ.) 2 Dosing: a. Timed dosed, pressure distribution is required. The design of the distribution system must comply with the requirements of section 30-10-40 C.1. b. Recirculation ratio: 3:1 — 5:1 c. Gallons/orifice/dose: 1 — 3 (2.0 typ.) d. Hydraulic loading: 3 - 5 gal./sq.ft./day (4 — 5 typ.) e. Dosing time "ON"; <2.5 min. (<2.0 typ.) f. Number of cycles/day: 48 e 120 3. Top gravel requirements: a. Washed, graded gravel, or rock, must range in size from 1/2 inch to 2 1/2 inches. AASHTO M 43, No.3 coarse aggregate meets this specification. b. The gravel must surround the distribution pipes used to disperse the effluent and must be at least 6 inches below and 2 inches above the pipes. c. State accepted manufactured media may be used as an alternative to specified gravel. d. Soil cover is prohibited. The upper gravel layer must be open to the atmosphere. 4. Filter media requirements: a. Effective size: 1.5 — 2.5 mm b. Uniformity coefficient: ≤ 3 c. Fines passing #200 sieve: ≤ 1.0 9 d. Media depth (min.): ≥24 inches 5. Intermediate gravel l er a. An intermediate layer of pea gravel, two inches in thickness, must be placed between the coarse underdrain media and the sand filter media to prevent the migration of sand into the lower layer of under -drain gravel (ASTM C 33, No. 8, coarse aggregate). Under -drain requirements: a. A minim m four -inch diameter ?lotted SCH10 PVC under -drain pipe must be used to collect the treated effluent. The under -drain pipe must be installed in the center of a 5 inches thick bed of washed, graded gravel, or roc . rant in _ size from 112 inch to 2 1/2 inches. AASl E T o M 43, No.3 coarse acorecate meets this specification. . PVC liner requirements: a. Lined s nd filters must have an irnpery ous liner on the sides a :t d bottom of the filter. The liner must consist of a 30 mil thickness PVC material or equivalent. Effluent collec ed from the recirculating sand filter must be discharged to a soil treatment area. The sod treatment area may be sized with a maximum ;one&term acceptance rate of the receiving soil for TLI effluent. 30-11-4o Mound Systems A. When the infiltrative surface area of the media r eceivinq wastewater effluent is at or above the natural grou id surface at any point it shall be considered a mound system. B. Mound sy stems that provide a minimum of _ 24 inches of sand treatment media ma\- use the application rates for the in -situ receivifts soil for TL eff uent (Table 10-1). Size - adjustment factors within I -able 30-10-3 may be applied if L1 application rates are used. C. Mound s- stems must conform to he design requirements of sections 30-11-30 C. I -5 for unlined (open bottom) sand filters, with the following exceptions. 1 A mound system may include less than 24 inches of imported sand media on a site where a esser depth of sand media is sufficient to meet vertical separation requirements above a limiting laver. Application rates for he in=situ receiving soil for TLI effluent must be used when less than 24 inches of sand media is used, unless higher level treatmert is provided prior to dispersal into the mound system. 2. For the esign of a mound system where less than 24 inches of sane' media is aci pc sed, and applica :ion rates for T l `I are used, the size adjustment factors within Table 30-10-3 may be used. . The basal area must be determined using th receiving soil under the mound. from Table 30-10-1 for the in -situ G% / E. Unear loading rates nnust be determ -led. Tire evaluation of many factors is requured for an accurate determhiation of the irear loading rate. VVhHe ado D i ration rates for the in -situ receiving soil urder tre round is a main com onert9 acement on the siooe, and percert of s ope mast a so be addressed when defining hrHear loading rate. If the movement of the effluent us o nm a rn verUca then the linear _ oathnd _ r .'ce is not as c'iticak I _ owevcr, if the moverr'-ent of the effluent will be codmariIy horizontal, as would be expected soil Woes 3A through 5 (Tabe3O'O=i),lthen the linear 'Soling rate is extremely irbortaet and one narrow mounos are strop qhL recommended. When i L i off! eat is applied to _ the distribution media of a mound sstem insta above i .msitu soil types 1 through 3 (Table 30 10-1) and ,-&-(0 through 10 -IA), the si oested linear loading rate is between 6 apd/lin.ft. and u The maximum width of the distributio i media in a mourd s stem installs( _ these soil types is '2 Feet when 11 _ Li if' Len': is a mound system. led R-2 (Table 30e ,d/lin.f'. above °plied to _ the distribution media of a 4. When TL2 through 3N offluent is app led to Me distribution media of a mound system installed above in -situ soil types r throuq n 3 (Table 30-'10- and R-0 through R-2. (Table able 30 -10 -IA), the fear loading rate may exceed ` 2 q,pd/din. . :_subseg uentl the mound may be wider titan 12 feet. 3. en ED I through 3N effl ue It is apaked to mou nd systems insta led above unnsutu soil types 3A t.hrouoh 5,Table 30-10-1 :, the suggested linear loading rate is between 3 d/lin.ft. and 5 qpd/Pin. t Tree maximum width of the thstributio�n media in a mound system paced above these soli types is 12 feet. The fund cover over a mound sx stem must extend at east twelve inches horizonta roe yond the perimeter of the distrioutiomedia prior to s going dwn to existing grade. The final. slope of the mound must be ro greater than three feet horizontal to one foot vericaL The surface of ne mou ided area must be planted with a suitable vegetative cove Q H A su %Ayested reference _ for the desi n and installatior of mound systems is, "the Wisconsin Mound Soil Absorption System: Si/ npt Designs and Construction Manual January 2000". Note that this is suggested quidarce, arch where the roeuUrernents if this reg. Matson differ from those in tie referenced mound docu inert, the requirements of this regulation wpb} govern w arose cases. Sec. 3 Treatm ti- -11450. Rock Plant Filter (constructed Wetland) Treatment Before a soil nt AreL. A. A rock plant filter system must be designed by a professional engineer. B. The design must be site specific and include specifications for: loading, capacity, dimensions, liner material, filter media, effluent depth and depth control mechanism, density and species of plant material, instructions for maintenance and other pertinent information as requested by the Division. C. The treated effluent from a rock plant filter must be distributed to a soil treatment area. gat D. Although producing higher level treatment, rockplant filters must not be assigned a treatment level higher than TL1 because of system and seasonal variability. ARTICLE XII DESIGN CRITERIA — OTHER FACILITIES rl 1 r- - '+ew$ e'r Parn-ar 4!` L �f/� G1 �¢ �p� 7 l:S n 11 flaL Any- TS4 eat i ng-t4e-- -z . s-ewate-rr-8a-i- n g of to r th c se� ust r e S t--a-l-l-m i n-i m 9 -design and co n -s ru-c t i-ona-n -wd - $o r-- Ar L i ONACTS based on the Motu e -a n ch•a-rKacter-of--tastes -for ts tieares --a- h - r umbeF-of -gyp ers -Re _ to be-se-Rted. Sec. 30-12-210. Evapotranspiration and Evapotranspiration/Absorption Systems. A. Non -Pressurized Drip Dispersal System (NODS): 1. An NDDS is considered a type of evapotranspiration/absorption system. However as specific design criteria is provided for an NDDS, they are exempt from the additional requirements of section 30-12-10 B, C and D. 2. The Colorado Professionals in Onsite Wastewater Guidelines for the Design and Installation of Non -Pressurized Drip Dispersal Systems (NDDS), September, 2016 is the procedural guideline in the design of a NDDS and must be followed when an NDDS is proposed. 3. The width of an NDDS system may be wider than 12 feet. B. The following section provides general criteria which must be followed when an evapotranspiration or evapotranspiration/absorption bed is proposed. 1. The design may only be permitted in arid climates where the annual evaporation rate exceeds the annual precioitation rate by more than 20 percent, and where site characteristics dictate that conventional methods of effluent dispersal are not appropriate. 2. An evapotranspiration system The design may only be des eva &r -a- i-on -ati-on only, orpermittec in soil types 3/1/27 4, 4A and 57 ai+ b &o -r a o n may 24 S- co s.. -i-d-e r -e _. 3. I,. The systemA-n-e 4. ton system or evapotranspiration/absorption system must be designed by a professional engineer. If data for the Pan Evaporation Rate is provided, it must be multiplied by 0.70, or less, to obtain the equivalent Lake Evaporation Rate. 5. The width of the bed may be wider than 12 feet. 6. The required capillary or wicking sand must meet the gradation requirements in Table 12-1 and be approved by the design engineer. This sand is to be covered by a 9� crowned, thin layer of loamy -sand mix and appropriate vegetation that will assist in drawing the water to the surface. 7. Adjustment factors as provided in Tables 30-10-2 and 30-10=3 must not be used. Table 30-12-1 Gradation of Wicking Sand for Evapotranspiration Beds (Fine Sand) Sieve Size Percent Passing 4 100 40 50-70 200 <15 C. For systems designed strictly as an evapotranspiration bed, the following criteria must be met: 1 _9. Design data to be furnished must include, but shall not be limited to: system dimensions distribution system design;.,. specifications of gyr ve distribution media and wicking sand -if -used, liner material if used, an -d -bedding;, properties of the soil under the •sv-a; ra--sp-i-ration system,. and provision for vegetation cover, and a water balance calculation including annual precipition and storage requirements for periods of the year when evapotranspiration does not occur. 2. 3. The following formula maymust be used as a guide for determining the minimum area necessary for total evapotranspiration of septic tank effluent: Area (in square feet)* = Design Flow (in gallons per day) x 586 Lake Evaporation Rate at the Site (in inches per year) * Additional area may be required based on the annual water balance calculations. 3. Designs will include a rock and pipe, or other Water Quality Control Division approved proprietary distribution product, with the centerline of the distribution system 6 to 8 feet on center. A thin non -woven fabric may be placed above the distribution system. Capillary wicking of the effluent is accomplished by a uniform depth layer of the specified sand media (capillary wicks), no more than 24 inches deep, placed between and above the distribution media. The base of the evapotranspiration bed may be no more than 30 inches below finished grade. 4. Capillary wicks which penetrate between the distribution system to the bottom of the beo, must be at least 15 percent of the bed surface area. The wicks must be uniformly paced throughout the system. 4. As a-pramcama, tive o-a4-ance fec the system. Such a design would pro\ c ir4y-flows for all periods in whi'ch -o be a monthly water 5. tl-`-�0 1"�vv - -`� i-'-- arevides s Mc � s� �a a at n -d 9 �- - -u r s -w ¢ an � r� a ° a° -h A� 'r c K }� :�""c,�a a a � �' a s�i -A �� a o � E � a� �'""��S.� �r� �3- �` 3 � a"-7"�� "'� as Y a -o--t-h --" oo. --- "f the -bed --hey—m u &-b -- I $ `1-0 - = _ .red :t --- Mh d u- face rT i s .m .s t--be.-u_ ." o r _ ,' s p t "e a gt oJI < 'ti --Sand- a e d - n- va of as ns ti o _` uor-'eta pe hasp-' i r tarbta bs -o ' r4on-b d s for li -us-t--m-- -a4 e i g i"ti -st i re z°� n � e_. 2m ' n d e_. 4" b h h o-'`�� e-- ��"o-� -�� a r� � �-�---��---� � �-0 �-��}°I � `�---��-.a--� �-p�o�� . �-�� e � sign Tale0----1-24 �-- . r-- - p a- . ra -i . e a.4-90 Arg iPdaG 2-0 9 445 7. Ael-eq-uace aoe-- re- --- it Ix., d d to--svapo a 4 i-r te-4-etaI a-n-rtual avarage-d-aaws-at _ a--rate-e-opu-ktale-n-t to-l-e-oal-n-e-44-a-kme-e-v-aw-a-than-ineal ei_onctr h -part aye --ye a-r-v.the-3 4h ` -rya-on rate -is n -c4 -m- a-su-- • A _,.x2r. Q • `epq,, y� an+r 1c. P"9 `Q p� 'S� rptto " 9. s st y the �'ra° a Q�✓�nrt � 6 �-��-e�Q7 �-� , � � 5�� m -�- o f to' ' e'_ a -r cl _ ` vmot r�s- p ra a --a- l- r ss— m ye-c u me - ca en -t- a b- -o d br t - e--- .oi-----b.--se-d-on-th-e I n - m-- - - e an c eatom; a that-s<o-i_ tp 59. Except for dwellings, if the system is designed for summer use only, the surface area may be multiplied by 0.6 to obtain the required area. Q .--Eva- be- n -d --e ca petr-a-r- h ra y o a a--a-f-sue r6 ° -o- --may --bew4d- r t h 12 f t D. For systems designed as an evapotranspiration/absorption bed, the fonovvina criteria must be met. Data to be furnished must include, but is not limited to: system dimensions, distribution system design, specifications of wicking sand, properties of the soil under the evapotranspirationtabsorption bed, provision for vegetation cover, and a water balance calculation including annual precipitation an° storage requirements for periods of the year when evapotranspiration does not occur. 2. Desgn will Inc ude a rock and pipe, or other Water Quality Control Division approve roprietary distribution product, with the centerline of the distribution system 6 to 8 feet on center. A thin no -woven fabric may be placed above the distribution media capillary wicking of the effluent is accomplished by a uniform depti layer of the specified sand media jcapoillary wicks\ no more than 24 inches deep placed between and above the distribution media. The infiltrative surface may be no more than 30 inches beiow finished grade. .g oft 3. Capillary WICKS which penetrate between the distribution system to the bottom f the bed, must be at least 15 percent of the bed surface area. The wicks must be uniformly spaced throughout the bed. 4. Amount of storage and evapotranspiration capacities may be reduced by the volume of effluent absorbed by the underlying soil based on the long-term acceptance rate for that soil type and the formulas provided in section 30-12-10 D.5. below. The following formula must be used for determining the minimum area necessary for evapotranspiration/absorption of septic tank effluent: Area (sq. ft.)* = Flow (apt LIAR AR + FIR) a. LTAR refers to the long -tern acceptance rate of the underlying soil as provided in Table 30-10-1 for e L1 effluent. b. E T R refers to the evapotranspiration rate derived from the following formu la: ETR (gal./day sq. ft.) = Lake Evaporation Rate at the Site (in inches oer year) 586 * Additional area may be required based on the annual water balance ca A. C .str-u-c#i --of=n _ e -s -�� e p s for s i n le$a i o yes-i-s--pre i ti e d tank ; st-p.re_ce e the -wastewater posek tthe4e& -n etu-d Y� - f -the- {i -a -e wa -p n`clr au -s e— _ive -ft, A -yid -as -taw r p -°us -h -fee t _ flee-b-ea-rc bav'-t -e culations. a _ wa stewa4 9 and must be fanis - - fib- ut- pet s - min ,r yo -u- t people. F.- (-s to vaner p -ds- 6-s-fcbe--Ss4g d on th - - ys - -s- , -nth-,lpia Fa4a c - l -u -n- e-si n4 w pr - -tati-en ra ton —a d— e -p -a te-E-p-o-r d -s- -�1t-be-eo- stru so e seepage-eat--of-the bot° - -ed=s de o c -oe-s net -exceed --143- k ' k --c nie - - d -u s inn-;-eam- a . a-----impe-rmeab e-s-yn 4i- : s r-=ane_kn- m-u-si mu -sin -be -used: H -,---M- n4 -ay e---must-inctud e thfre u -a 4c --and # d—pta-nts f-ro- -Jg- ewi-n-g--i n -o ---rn r e p nib j pr - o"tsv i, i-i`a s id- s �� h a e -re io Y _ d— e -lo ing— -r . s -s 8 e -F -F- 1-21-Rt R d7 be -d- siSl-by fe s s -O- ake-n-g t n -e r 94- Sec. 30-42-420. a other tha n and Vault Privies. A. Vaults for full time use in new construction are prohibited where a property can accommodate an OWTS with a soil treatment area. B. Vaults may be permitted under the following conditions: 1. Where there is limited use occupancy on a property which cannot accommodate an OWTS with soil treatment area. 2. If the facility is on land where the installation of an OWTS with soil treatment area is not permitted. 3. Where there is only a temporary water source available (bottled water, cistern). 4. Temporary use for on -location construction offices (mobile offices) not to exceed 6 months. 5. Low flow commercial uses that are temporary, such as gravel mining operations. 6. Seasonal recreational facilities where use is no more than 6 months per year. 7. A vault system variance approved by the Board of Public Health. 8. Where some of the wastewater flows are separated, such as toilet wastes only, into a vault. The portion not retained in the vault must be treated in an adequately sized OWTS. C. A vault must have a minimum 500 gallon effective volume or be capable of holding a minimum of the two- a -y48 hour design wastewater flow, whichever is larger. D. A visual and audible signal device, indicating filling to a maximum of 75 percent capacity, must be installed to indicate when pumping is necessary. E. Concrete vaults must meet the strength and watertightness requirements for septic tanks. Prefabricated fiberglass, fiberglass -reinforced polyester, and plastic tanks may be used as vaults, if the tank manufacturer provides testing criteria certifying them for this use. F. Contents of the vault must be pumped by a Weld County licensed systems cleaner, and records of maintenance and proper disposal shall be maintained by the owner and available for review by the Division. Vault PriNnarl. A 1. Effective volume of the vault privy must be no less than 400 gallons and it must be constructed of concrete or plastic. The vaults for privies must meet the structural and watertightness standards of vaults. ` A vault privy must be built to include: fly- and rodent -tight construction, a superstructure affording complete privacy, an earth mound around the top of the vault and below floor level that slopes downward away from the superstructure base, a floor, 97 and a riser of concrete or other impervious material with hinged seats and covers of easily cleanable, impervious material. All venting must be fly -proofed with No. 16 or tighter mesh screening. C. 3. _ A signal device is not required for a vault privy. D. H. A permit fee, as set by the Board of County Commissioners, shall be required of applicants for any system that requires only a vault or holding tank. An application for an OVVTS permit must be completed by the owner and a final inspection must be made by the Division with proper notice as specified in Section 30-4-70. Sec. 30-12-250. Incinerating, Composting and Chemical Toilets. A. The use of an incinerating, composting or chemical toilet will not reduce the required size of the OVVTS as noted in Section 30-3-10. B. Only -incinerating and composting toilets race-iving pie- d rope n-ce -by the Water QuaR-ty Control Divis -n may be permitted. Incinerating and composting toilets shall bear the seal of approval of the NSF or an equivalent test and certification program. C. P. Permitting of an incinerating or composting toilet may also be subject to the jurisdiction of a local agency regulating plumbing or the Colorado Plumbing Board, whichever has jurisdiction over plumbing in the location. CTD. An incinerating or composting toilet may be used for toilet waste where an OVVTS is installed for treating wastewater remaining after removal of toilet waste. Subject to Board of Public Health, or other applicable regulations or codes (e.g., Colorado Plumbing Code if a local code does not exist), the compartment may be located within a dwelling or building provided the unit complies with the applicable requirements of this Regulation, and provided the installation will not result in conditions considered to be a health hazard as determined by the Division. Compartment and appurtenances related to the unit must include fly -tight and vector -proof construction and exterior ventilation. B.D. Incinerating Toilets: An approved incinerating toilet must be designed and installed in accordance with all applicable federal, state, and local air -pollution requirements and manufacturer's instructions. 1. Incinerating Toilets Acceptance Requirements a. Incinerating toilets must meet the requirements of the NSF Protocol P157 and bear the seal of approval of the NSF or an equivalent testing and certification program. b. incinerating toilets must be operated acccroirq to manufacturer's specifications. F.B. Composting Toilets. 1. 1. Composting toilets must meet the requirements of NSF/ANSI Standard 41 and bear the seal of approval of the NSF or an equivalent testing and certification program. 9f 2. An approved composting toilet must treat deposits of feces, urine, and readily decomposable household garbage that are not diluted with water or other fluids and are retained in a compartment in which aerobic composting will occur. 3. The effective volume of the receptacle must be sufficient to accommodate the number of persons served in the design of the unit installed. The effective volume of the unit must include sufficient area for the use of composting materials which must not be toxic to the process or hazardous to persons and which must be used in sufficient quantity to assure proper decomposition. Residue from the composting toilet must be removed when it is filled to 75 percent of capacity. Residue from the unit must be properly disposed of by methods recommended by the manufacturer and acceptable to the Division. Disposal methods must prevent contamination of water and not cause a public health nuisance. Disposal using solid waste practices is recommended. 5._zk__lf a system will be installed where low temperature may be a factor, design and insta lation must address the effects of the low temperature. 6. 5. Composting toilets must be operated according to manufacturer's specifications. - Portable Chemical Toilets. 1. A portable chemical toilet may be used by permit from the Division. 2. Use of a portable chemical toilet in permanently occupied buildings is prohibited except during construction or under emergency circumstances as determined by the Division. Proper ventilation of a chemical toilet used inside must be required. Sec. 30-12-650. Treatment Systems Other Than Those Discharging Through a Soil Treatment Area or Sand Filter System. A. For systems discharging to State Waters, see Section 30-2-3O.A. B. Systems that discharge other than through a soil treatment area or a sand filter system must: 1. Be designed by a professional engineer; 2. Be reviewed by the Board of Public Health; and 3. Not pose a potential health hazard or private or public nuisance or undue risk of contamination.- 4. Not allow drainage of effluent off of the property of oriqnn. C. The Board of Public Health may choose to permit only systems that do not allow drainage of effluent off the property of origin. D. The following minimum performance criteria must be required for all permitted systems pursuant to this Section: 9 9 1. If effluent discharge is made into areas in which the possibility exists for occasional direct human contact with the effluent discharge, the effluent at the point of discharge must meet the minimum treatment criteria of TL3 effluent and specifically adhere to each of the following standards: a. The geometric mean of the fecal coliformE. coli density must not exceed 2-515 per 100 milliliters when averaged over any five consecutive samples, and no single sample result for fe a1-- oMormE.coli can exceed 20-0120 per 100 milliliters. b. The arithmetic mean of the standard five-day carbonaceous biochemical oxygen demand (CBOD5) must not exceed ten milligrams per liter when averaged over any three consecutive samples. c. The arithmetic mean of the total suspended solids must not exceed ten milligrams per liter when averaged over any three consecutive samples. 2. If the effluent discharge is made into an area so restricted as to protect against the likelihood of direct human contact with the discharged effluent, the effluent at the point of discharge must meet the treatment criteria of TL2 effluent and specifically adhere to each of the following standards: a. The geometric mean of the fecal co-lifer-mE. coil density must not exceed 50-0126 per 100 milliliters when averaged over any five consecutive samples, and no single sample can exceed 5000325 fecal colifor -E.coli per 100 milliliters. b. The arithmetic mean of the standard five-day carbonaceous biochemical oxygen demand (CBOD5) must not exceed 25 milligrams per liter when averaged over any three consecutive samples. c. The arithmetic mean of the total suspended solids must not exceed 30 milligrams per liter when averaged over any three consecutive samples. E. To determine compliance with the standards contained in this Section, the required sampling frequency for fe,GalcolitecrRE.coli, CBOD5, and total suspended solid levels must be performed at least once per month when the system is in operation and the results submitted to the Division for compliance with the permit requirements. F. Methods of Analysis — Sampling Points: 1. All effluent samples must be analyzed according to the methods prescribed in the American Public Health Association, American Water Works Association, and Water Environment Federation: Standards Methods for the Examination of Water and Wastewater, 21St edition. 2. The sampling point must be a location that is representative of final discharge from the system. ARTICLE XIII Operation and Maintenance Sec. 30-13-10. Responsibility. The owner must be responsible for maintenance of an OWTS unless the responsibility has been contractually assigned to a tenant or a third party or a public, quasi -public, or political subdivision. Sec. 13-13-20. Service Label. For higher level treatment systems or other components under a service contract, a clearly visible, permanently attached label or plate giving instructions for obtaining service must be placed at a conspicuous location. Sec. 30-13-30. Monitoring and Sampling. A. For an OWTS for which monitoring of effluent is required, a delegated third party must collect and test effluent samples to ensure compliance with the provisions of this Regulation. B. Sampling may be required by the Division in conjunction with an enforcement action. C. Any owner or occupant of property on which an OWTS is located may request the Division to collect and test an effluent sample from the system. The Division may perform such collection and testing services. The owner or occupant must pay for these services. 1 If the Division or a delegated third party collects and tests effluent samples, a fee not to exceed that which is allowed by the OWTS Act (Title 25, Article 10) may be charged for each sample collected and tested. Payment of such charge must be stated in the permit as a condition for its continued use. 2. Conditions when the Division can require routine monitoring including, but not limited to. a. Indications of inadequate performance; b. Location in sensitive areas; c. Experimental systems. 3. Sampling and analysis must be performed according to American Public Health Association, American Water Works Association, and Water Environment Federation: Standards Methods for the Examination of Water and Wastewater, 21st edition. /O / APPENDIX 30-A TEXTURAL TRIANGLE DEFINING TWELVE TEXTURAL CLASSES OF THE USDA (ILLUSTRATED FOR A SAMPLE CONTAINING 37% SAND, 45% SILT, AND 18% CLAY) SOURCE: EPA Design Manual for Onsite Wastewater Treatment and Disposal Systems Soil Textural Triangle 100 90/ 80 47/ Ibt 50 i 40 20 10 30 sandy clay loam 70 60 sandy clay loamy / sand sand CP 6V clay clay loam o silty clay r s'3 0. ete 00 silty \ clay loam a co silt loam o 4. JCIGJ8vA. OM '.'_:./Y..::.YSx rSMr11JGY.GW/ : ' - . !.v.e34' J.'.l.•C:.^S511S1:PiF:Rv`i:HbC.%:ii�Y''YY1:d" giyESAVI PS,1=1.PM.Vfi AYF2raUttCt :'4.4- .. yrO Sand Separate, % op O 'O$ 00 APPENDIX 30-B SOIL CLASSIFICATION SYSTEM (SOIL -SEPARATE SIZE LIMITS) SOURCE: USDA NRCS Field Book (pages 2-45) _.._...._ _.......... USDA FINE EARTH 150 ROCK FRAGMENTS Sao 6O0 mm Ch anners fl agsi s r;es 1 stones L boulders _ _... _. _...___... _ .. Clay Silt Sand Gravel Cob - _ _ _ --.. - ---- - _- fine co. _ fine co. v.fi. fi. med. co. cc fine medium coarse tiles Stones Boulders millimeters: U.S. Standard Sieve No. 0.0002 .002 mm .02 .05 .1 .25 .5 1 2 mm 5 20 76 (opening): 300 140 60 35 18 10 4 (3/4") (3") 250 mm 600 mm (10') (25') International Clay Silt __Sand fine coarse Gravel Stones millimeters: U.S. Standard Sieve No. .002 mm .02 .20 (opening): 10 2 mm 20 rum (3/4") - - ._. Unified Silt or Clay Sand Gravel fine medium cc. fine coarse Cobbles Boulders millimeters: U.S. Standard Sieve No. .074 .42 2 (opening): 200 40 10 mm 4.8 19 76 300 4 (3/4') (3') mm AASHTO i I Clay Silt Sand Gravel or Stones Broken Rock (angular), fine coarse fine med. co. I or Boulders (rounded) millimeters: .005 mm .074 .42 2 U.S. Standard Sieve No. (opening): 200 40 10 mm 9.5 25 75 mm (3/8') (1') (3') phi #: 12 10 9 8 7 6 5 4 3 2 1 0 -1 -2 -3 .4 -5 -6 -7 -8 -9 -10 -12 Modified > 4 I co bb/�, clay r silt �,� sand {i Wentworth pebbles s ® boulders millimeters: .00025 .002 .004 .008 .016 .031 .062 .125 .25 .5 1 2 4 8 16 32 64 128 256 4092 mm U.S. Standard Sieve No.: 230 120 60 35 18 10 5 APPENDIX 3 eC ANNUAL FREE WATER SURFACE EVAPORATION MAP OF WELD COUNTY ADAPTED FROM NOAA TR NWS 33 UNITS: INCHES/YEAR WO 6 Hello