HomeMy WebLinkAbout20133354.tiffJv;,at
/a-9- aoi3
WELD COUNTY
CODE ORDINANCE 2013-13
= IN THE MATTER OF REPEALING AND REENACTING IN ITS ENTIRETY, CHAPTER 30
SEWAGE SYSTEMS, OF THE WELD COUNTY CODE
BE IT ORDAINED BY THE BOARD OF COUNTY COMMISSIONERS OF THE COUNTY OF
WELD, STATE OF COLORADO:
WHEREAS, the Board of County Commissioners of the County of Weld, State of
Colorado, pursuant to Colorado statute and the Weld County Home Rule Charter, is vested with
the authority of administering the affairs of Weld County, Colorado, and
WHEREAS, the Board of County Commissioners, on December 28, 2000, adopted Weld
County Code Ordinance 2000-1, enacting a comprehensive Code for the County of Weld,
including the codification of all previously adopted ordinances of a general and permanent nature
enacted on or before said date of adoption, and
WHEREAS, the Weld County Code is in need of revision and clarification with regard to
procedures, terms, and requirements therein.
NOW, THEREFORE, BE IT ORDAINED by the Board of County Commissioners of the
County of Weld, State of Colorado, that certain existing Chapters of the Weld County Code be,
and hereby are, repealed and re-enacted, with amendments, and the various Chapters are
revised to read as follows.
CHAPTER 30
WELD COUNTY DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT
ON -SITE WASTEWATER TREATMENT SYSTEM REGULATIONS
TABLE OF CONTENTS
ARTICLE I AUTHORITY 1
ARTICLE II SCOPE AND PURPOSE 2
ARTICLE III DEFINITIONS 3
ARTICLE IV ADMINISTRATION AND ENFORCEMENT 14
ARTICLE V SITE AND SOIL EVALUATION 26
ARTICLE VI WASTEWATER FLOW AND STRENGTH 34
ARTICLE VII MINIMUM DISTANCES BETWEEN COMPONENTS OF AN ON -SITE
WASTEWATER TREATMENT SYSTEM AND PHYSICAL FEATURES 40
ARTICLE VIII DESIGN CRITERIA -GENERAL 44
ARTICLE IX DESIGN CRITERIA -COMPONENTS 47
ARTICLE X DESIGN CRITERIA -SOIL TREATMENT AREA 53
ARTICLE XI DESIGN CRITERIA -HIGHER LEVEL TREATMENT SYSTEMS 63
ARTICLE XII DESIGN CRITERIA -OTHER FACILITIES 65
ARTICLE XIII OPERATION AND MAINTENANCE 71
PAGE 1
2013-3354
ORD2013-13
Appendix 30-A
Appendix 30-B
Appendix 30-C
TEXTURAL TRIANGLE DEFINING TWELVE TEXTURAL CLASSES
OF SOIL OF THE USDA 72
SOIL CLASSIFICATION SYSTEM (SOIL -SEPARATE SIZE LIMITS) 73
ANNUAL FREE WATER SURFACE EVAPORATION MAP OF WELD
COUNTY ADAPTED FROM NOAA RR NWS 33 74
PAGE 2
2013-3354
ORD2013-13
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 & 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 2,000 gallons per day design capacity (Site approval and a discharge permit
from the Colorado Department of Public Health and Environment, Water Quality Control
Division are required for a system with design capacity greater than or equal to 2,000
gallons per day average flow).
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
PAGE 3
2013-3354
ORD2013-13
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 shall apply to On -site Wastewater Treatment Systems (OWTS) as defined
in section 25-10-103(12), C.R.S.
Sec. 30-2-20. Purpose
A. The purpose of this regulation as authorized and required by the OWTS Act 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, 25-8-101 et seq. C.R.S, and all applicable regulations of the
Water Quality Control Commission. Compliance with such a permit shall 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.
"Applicant" means a person who submits an application for a permit for an On -site
Wastewater Treatment System.
"Bed" means a below -grade soil treatment area consisting of a shallow excavation greater
than three feet wide containing distribution media and more than one lateral.
PAGE 4
2013-3354
ORD2013-13
"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.
"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.
"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 Examining Board of Plumbers Rules And Regulations (3
CCR 720-1).
"Commission" means the Water Quality Control Commission created by section 25-8-201,
C.R.S.
"Competent technician" means a person designated by a local public health agency who is
able to conduct and interpret the results of soil profile test pit excavations, profile holes,
percolation tests, and site evaluations.
"Component" means a subsection of an On -site Wastewater Treatment System; a component
may include multiple devices.
PAGE 5
2013-3354
ORD2013-13
"Composting toilet" means self-contained waterless toilet designed to decompose
non -water -carried human wastes through microbial action and 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.
"Crest" means the highest point on the side of a dry gulch or cut bank.
"Deep gravel system" means a soil treatment area for repairs only where the trenches utilize a
depth of gravel greater than 6 inches below the distribution line and sidewall area is allowed
according to a formula specified in this Regulation.
"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 or
more trenches or two or more 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 2,000 gallons of domestic wastewater per day or more. 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
PAGE 6
2013-3354
ORD2013-13
that human wastes generated incidentally to the industrial process are treated therein. 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 delivery of effluent under pressure to a component, device or to a
soil treatment area for even distribution.
"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 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 line" 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.
PAGE 7
2013-3354
ORD2013-13
"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" means damage to a system component, structural member or connection.
"Field performance testing" means data gathering on a system in actual use that is being
proposed for Colorado Department of Public Health & Environment, 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 Colorado professional engineer shall 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 shall 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 shall 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.
PAGE 8
2013-3354
ORD2013-13
"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 pad 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.
"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 device into 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 pipe, tubing 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 condition" means a layer with low permeability, ground water surface or other
condition that restricts the treatment capability of the soil.
"Liner" means an impermeable synthetic or natural material used to prevent or restrict
infiltration and/or exfiltration.
"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 (g/ ft2/day).
PAGE 9
2013-3354
ORD2013-13
"Malfunction" means the condition in which a component is not performing as designed or
installed.
"Manufactured media" See Media, manufactured.
"Media" means solid material that can be described by shape, dimensions, surface area, void
space, and application.
"Media, manufactured" means a synthetic media for distribution such as polystyrene blocks or
beads or plastic grids.
"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 an above -grade soil treatment area designed and installed with at least 12
inches of clean sand between the bottom of the infiltrative surface and the original ground
elevation; that utilizes pressure distribution and includes a final cover of suitable soil to stabilize
the surface and 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, 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.
PAGE 10
2013-3354
ORD2013-13
"Pressure distribution" means application of effluent over an infiltrative surface via pressurized
orifices and associated devices and parts (including pump, filters, controls, and piping).
"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 12-25-1,
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.
23-41-208, C.R.S. and 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.
"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 good performance.
"Restrictive layer" means a horizon or condition in the soil profile or underlying strata that
restricts movement of fluids. A restrictive layer may constitute a limiting soil/site condition.
"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 a system that utilizes a layer of specified sand as filter and treatment
media and pressure distribution.
"Sand filter, lined" means a sand filter designed for higher level treatment that has an
impervious liner and under -drain below the sand layer. 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.
PAGE 11
2013-3354
ORD2013-13
"Sand filter, unlined" means a layer of sand used as a sand 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 preceeding 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
trench and fills it to a predetermined level before passing through a relief line 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 trench
and fills it to a predetermined level before passing through a relief line 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
PAGE 12
2013-3354
ORD2013-13
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 hole" means a hole dug or drilled near a proposed soil treatment area to locate
bedrock or ground water, if present. Observations of soil cuttings may be made.
"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 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. (Sec. 25-8-103 (19) C.R.S.)
"Strength, wastewater" means the concentration of earth such as joints in bedrock, gravels, or
very coarse soils and which meets percolation constituents of wastewater or effluent; usually
expressed in mg/L.
PAGE 13
2013-3354
ORD2013-13
"Suitable soil" means a soil which will effectively treat and filter effluent by removal of
organisms and suspended solids before the effluent reaches any highly permeable test or soil test
pit excavation requirements for determining long-term acceptance rate and has a vertical
thickness of at least four feet below the bottom of the soil treatment area unless the treatment goal
is met by other performance criteria.
"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 media" See Media, treatment.
"Treatment level" means defined concentrations of pollutants to be achieved by a component
or series of components of an OWTS.
"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, effective volume under normal conditions is determined relative to the invert of the
inlet and the control off level.
PAGE 14
2013-3354
ORD2013-13
"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. influent 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 entering a
pretreatment component (as defined by NSF/ANSI Standard 40 testing protocol); 2. effluent from
a septic tank or other pretreatment component that has BOD5 greater than 170 mg/L; and/or TSS
greater than 60 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" See Commission.
"Water Quality Control Division" means the division of administration 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
PAGE 15
2013-3354
ORD2013-13
NAWT
National Association of Wastewater Technicians
NPCA
National Precast Concrete Association
NSF
National 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 Waters of the State, 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 on -site wastewater treatment system 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 cleaner, and tank
inspection report for evaluation of existing systems for loan approval inspections and/or
other inspections deemed necessary by the Division. The tank must be inspected and
pumped within the last two (2) years of the existing system evaluation request.
PAGE 16
2013-3354
ORD2013-13
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 Weld County Department of Public Health and Environment, Division of Environmental
Health Services.
B. An applicant must submit a complete application that is consistent with section 30-4-40.C.
to the Weld County Department of Public Health and Environment, Division of
Environmental Health Services 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:
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
PAGE 17
2013-3354
ORD2013-13
may be required to be submitted by the applicant. This requirement shall 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 on -site wastewater treatment system 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 groundwater 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 on -site wastewater treatment
system, 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 Weld County Department of Public
Health and Environment, Division of Environmental Health Services, may make
provision for the waiver of any permit fee normally required for an on -site wastewater
treatment system.
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.
PAGE 18
2013-3354
ORD2013-13
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 shall retain
three dollars to cover the Division's administrative costs and twenty dollars shall be
transmitted to the state treasurer, who shall 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 on -site wastewater treatment system permit are issued
for the same property, and construction is not commenced prior to the expiration date
of the building permit, the on -site wastewater system permit shall expire at the same
time as the building permit. If an on -site wastewater treatment system permit is
issued for property on which no building permit is required, the on -site wastewater
treatment system 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:
a. 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 Weld County Division of Environmental Health Services 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 shall 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.
PAGE 19
2013-3354
ORD2013-13
J. The issuance of a permit and specifications of terms and conditions therein shall 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 shall 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 the OWTS Act, and applicable rules and
regulations adopted under said section. A permit may be issued by the Division
Representative if the proposed system is determined to be in compliance with the
requirements of the OWTS Act, and the rules and regulations adopted pursuant thereto.
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. 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 30-4-120.B. 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. Experimental systems;
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.
PAGE 20
2013-3354
ORD2013-13
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. Right to Appeal.
1. Should the Board of Public Health deny an appeal under Section 30-4-50 hereof, 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
A. 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.
PAGE 21
2013-3354
ORD2013-13
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 system as
designed, if required to be engineer -designed;
2. Receipt of as -built drawing;
3. Final inspection prior to backfilling system by the Division confirming that the OWTS
was installed according to the permit requirements and regulations or variances to the
regulations; and
4. Identification of system contractor.
Sec. 30-4-90. Systems Employing New Technology
A. Systems employing new technology may be considered by the Division provided they
have been reviewed and accepted by the Colorado Department of Public Health and
Environment, Water Quality Control Division according to Section 43.13 of On -site
Wastewater Treatment System Regulation #43, as adopted in 2013.
Sec. 30-4-100. Experimental Systems
A. Except for designs or types of systems which have been approved by the Colorado
Department of Public Health and Environment, Water Quality Control Division pursuant to
section 25-10-108 (1), C.R.S., the Board of Public Health may approve an application for
a type of system not otherwise provided for in this regulation, 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 experimental system.
B. The Board of Public Health shall not arbitrarily deny any person the right to consideration
of an application for such a system and shall apply reasonable performance standards in
determining whether to approve such an application. (Section 25-10-108 (2), C.R.S.)
C. Requirements for consideration of an experimental system permit shall include, but not be
limited to:
1. The system shall be designed by a professional engineer to include such design
specifications, along with any previous laboratory or field testing data.
2. The necessary field tests shall be agreed upon by the manufacturer or professional
engineer and the Board of Public Health. The manufacturer or professional engineer
shall agree to conduct, at the manufacturer's or professional engineer's expense, such
field testing of the proposed system as the Board of Health shall require to ensure that
the system functions properly and creates no hazard to the public health.
3. The duration of the testing period shall be determined by the Board of Public Health.
PAGE 22
2013-3354
ORD2013-13
4. The manufacturer or professional engineer shall warrant the design and installation,
and shall agree, in writing, to remove any unsatisfactory installation, as determined by
the Board of Public Health, within the time limit stipulated by the Board.
D. The design shall provide for the installation of a back-up DINTS of a type described in
these Regulations or certified by the Colorado Department of Public Health and
Environment, pursuant to Section 25-10-108(1), which the applicant shall agree to install
in the event that the Health Officer determines that the proposed system, once installed, is
not functioning properly or is otherwise creating a hazard to the public health.
E. An unsatisfactory installation may be repaired or changed with the consent of and
observation by the Division Representative. However, the Board of Public Health may
limit the duration of the testing period, and may declare the design and installation to be
unsatisfactory. At that time, the Board of Public Health may require the experimental
system to be replaced by an acceptable installation or to be removed from the designated
lot. Failure to satisfactorily repair or remove an unsatisfactory installation shall be
deemed a violation of these Regulations.
F. The application for an experimental system shall include provisions for the timely
installation of a backup system upon failure of the experimental system. The time
allowed for replacement and the design of the replacement system shall be approved by
the Division prior to installation of the experimental system.
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 on -site wastewater treatment system unless he 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 on -site wastewater treatment system
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 License or renewals shall be made upon forms
supplied by the Division.
PAGE 23
2013-3354
ORD2013-13
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 on -site wastewater treatment system 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 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.
PAGE 24
2013-3354
ORD2013-13
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
1. The Division may set fees for processing an On -site Wastewater Treatment System
(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:
PAGE 25
2013-3354
ORD2013-13
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.,
Requirements for Variance Consideration above must be followed.
2. For the repair of or upgrade to an approved existing system where the existing system
does not meet the required separation distances and where the size of the lot
precludes adherence to the required distances, a variance to the separation distances
may be requested. The repairs or upgrade shall 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.
PAGE 26
2013-3354
ORD2013-13
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 written
consent of the owner of property containing said feature. Property lines are
considered offsite features.
4. No variance will be issued which reduces the separation to groundwater 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.
E. Outcome of the Variance Proceeding.
1. 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.
1. Should the Board of Public Health deny a variance under Section 30-4-130 hereof, 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; Section 25-10-112, C.R.S.
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.
PAGE 27
2013-3354
ORD2013-13
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.
Section 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 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
PAGE 28
2013-3354
ORD2013-13
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 a
reasonable period of time, 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; Section 25-10-113, C.R.S.
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 section 25-10-106, C.R.S.;
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 section 25-10-109 (1), C.R.S., in areas which the Board of Public
Health has adopted licensing regulations pursuant to that section;
5. Conducts a business as a systems cleaner without having obtained the license
provided for in section 25-10-109 (2), C.R.S., in areas which the Board of Public
Health has adopted licensing regulations pursuant to that section;
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 Regulations adopted by the Board of Public Health, pursuant to Section
25-10-106, 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.
1. Each site evaluation shall consist of:
PAGE 29
2013-3354
ORD2013-13
a. Preliminary investigation;
b. Reconnaissance;
c. Detailed soil investigation; and
d. Report and site plan.
Sec. 30-5-20. Preliminary Investigation
A. A preliminary investigation shall review documented information relative to the site and
anticipated conditions. Information gathered as part of the preliminary investigation shall
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. Weld County Department of Public Health and Environment, Division of Environmental
Health Services existing 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;
PAGE 30
2013-3354
ORD2013-13
e. Aerial photographs;
f. Climate information; and
g. Delineated wetlands maps.
Sec. 30-5-30. Reconnaissance
A. A reconnaissance visit to the property shall evaluate the topography and other surface
conditions that will impact the selection and location and design of the OWT'S, including:
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
shall be either:
1. Visual and tactile evaluation of two or more soil profile test pit excavations; or
2. Percolation tests plus one or more soil profile holes or one or more soil profile test pit
excavations.
B. If percolation tests are performed, at least one soil profile hole shall be evaluated to
determine whether current ground water levels and/or bedrock is encountered within 8
feet of the ground surface. A visual and tactile evaluation of a soil profile test pit
excavation as described in section.30-5-40.E may be substituted for a profile hole.
Following three years after the effective date of adoption of the Colorado Department of
Public Health & Environment, Water Quality Control Commission's Regulation #43, a
visual and tactile evaluation of a soil profile test pit excavation shall be used instead of a
soil profile hole when percolation tests are performed to determine long-term acceptance
rates. (Soil profile borings will not be allowed after 7/1/16)
C. If visual and tactile evaluations of soil are performed without percolation tests to determine
a long-term acceptance rate:
1. Evaluation of two or more soil profile test pit excavations must be performed to
determine soil types and structure, restrictive layers, evidence of seasonal high
ground water, and best depth for the infiltrative surface.
PAGE 31
2013-3354
ORD2013-13
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.
3. The total number of soil profile test pit excavations required is based on the judgment
of the competent technician.
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. 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 reasonably evenly over the
proposed area. There shall be no less than one test hole provided in every 1,200
square foot area of soil treatment area.
b. If the likely depth of a proposed infiltrative surface is uncertain, percolation tests
shall be performed at more than one depth to determine the depth of the infiltrative
surface.
3. Dimensions
a. The percolation test hole shall 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 shall be terminated in
the changed soil, and percolation tests shall be conducted in both holes.
5. Percolation Tests
a. The percolation tests shall 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.
PAGE 32
2013-3354
ORD2013-13
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 shall 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 shall 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 series 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 shall be taken as ten minutes and the test
PAGE 33
2013-3354
ORD2013-13
conducted for one hour. The drop that occurs during the final ten minutes shall
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 shall be recorded as less than one minute per inch.
f. Percolation Rate Determination and Reporting
1) The field percolation rate shall 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 shall 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 holes or soil profile test pit
excavations and percolation holes tied to lot corners or other permanent
objects. The drawing shall meet the criteria in section 30-5-60.A.7. All holes
shall be clearly labeled to relate to the information provided for the profile test
pits and percolation tests.
g. Percolation Test Waiver
1) If the applicant demonstrates to the satisfaction of the Division that the system
is not dependent upon soil absorption, the requirement of percolation tests
may be waived.
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.
E. Visual and Tactile Evaluation of Soil Requirements:
1. The visual and tactile evaluation of soil shall be performed by a professional engineer,
professional geologist, competent technician or other similarly qualified professional
as approved by the Division.
2. 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.
3. 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.
PAGE 34
2013-3354
ORD2013-13
4. The soil observation method must allow observation of the different soil horizons that
constitute the soil profile.
5. 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 shall be conducted.
6. The minimum depth of the soil profile test pit excavation must be to the periodically
saturated layer, to the bedrock, or four feet below the proposed depth of the infiltrative
surface, whichever is encountered first.
7. The soil type at the proposed infiltrative surface of the soil treatment area or a more
restrictive soil type within the treatment depth shall be used to determine the long-term
acceptance rate from Table 30-10-1. The treatment depth is three to four feet
depending on the required thickness for the treatment level below the infiltrative
surface from Item 4, Table 30-7-2.
8. Soils data, previously collected by others at the site can be used for the purposes of an
OWTS design at the discretion of the Division. It is recommended that the data be
verified, at a minimum, by performing an evaluation of a soil profile test pit excavation.
F. Soil descriptions for determination of a limiting layer shall include:
1. The depth of each soil horizon measured from the ground surface and a description of
the soil texture, structure, and consistency 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;
and
4. Any other soil characteristic that needs to be described to design a system, such as
layers that will restrict permeability.
Sec. 30-5-50. Percolation Holes, Profile Holes, and Profile Test Pits Excavations — Marking
A. The percolation holes, profile holes, and profile test pit excavations must be flagged or
otherwise marked to allow easy location by others. Percolation holes and profile test pits
must remain open until after evaluation by the Division. The profile test pit excavations
must be secured to eliminate safety hazards while kept open for evaluation.
Sec. 30-5-60. Report and Site Plan
A. A written report shall describe the results of the preliminary investigation, reconnaissance,
and detailed evaluations. The report may be in text and/or tabular form and shall include
PAGE 35
2013-3354
ORD2013-13
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. The name, address, telephone number, e-mail address, and 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 drill hole or excavation, soil description
and classification, depth to ground water encountered during drilling or excavation,
type of equipment used to drill the profile hole or excavate the soil profile test pit, date
of soils investigation, name of investigator and company name.
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.
Minimum drawing size shall 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 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 shall indicate dimensions, have a north arrow and graphic scale and include:
a. 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;
PAGE 36
2013-3354
ORD2013-13
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; 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.
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 shall 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;
2. A scale drawing showing location of each OWTS component and distances to water,
physical and health impact features requiring setbacks;
3. Layout of soil treatment area, dimensions of trenches or beds, distribution method and
equipment, distribution boxes, drop boxes, valves, or other components used;
4. Depth of infiltrative surface of soil treatment area, depth of the septic tank, depth of
other components;
5. Specifications of each component. Specifications for septic tanks or other buried
components must include loads due to burial depth, additional weight or pressure
loads, and highest elevation of ground water. Resistance to local water composition
such as high sulfates shall be included in the specification if such conditions exist at
the site;
6. References to design manuals or other technical materials used;
7. Installation procedures;
8. Operation and maintenance manuals or instructions; and
9. Other information that may be useful such as photos and cross-section drawings.
Sec. 30-5-80. As -Built Drawings
A. Scale drawing showing the OWTS as installed, including its location from known and
findable points, dimensions, depths, sizes, manufacturers' names and models as
PAGE 37
2013-3354
ORD2013-13
available, and other information relative to locating and maintaining the OWTS
components.
Sec. 30-5-90. Site Protection
A. During construction, the proposed soil treatment area and replacement area, if any,
must be protected from disturbance, compaction, or other damage by staking, fencing,
posting, or other effective method.
Sec. 30-5-100. 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 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 OWTS including both
class and field work.
PAGE 38
2013-3354
ORD2013-13
3. The Division shall 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 shall be 75 gallons per day (gpd).
2. The minimum design flow for a new home shall be for a two -bedroom house. The
minimum design flow for the repair or replacement of an OWTS of an existing
one -bedroom home shall be one -bedroom unless bedrooms are added.
3. For homes up to and including three bedrooms, the assumed number of persons per
bedroom shall be two for design purposes.
4. For homes with more than three bedrooms, the assumed number of persons shall be
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.
PAGE 39
2013-3354
ORD2013-13
2. If the flow from the auxiliary building is only generated by residents of the home, it shall
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 shall 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 shall 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 shall 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 shall 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 shall 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.
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 shall be at least equal to the full capacity of the facility.
3. The stored flow shall 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;
PAGE 40
2013-3354
ORD2013-13
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 pressure distribution shall be used. The soil treatment area reduction for timed
pressure distribution shall 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,
AVERAGE
GPD'
BOD5 IN
'� POUNDS RER
DAY
Single-family dwellings
75
.20
OR Single-family dwellings or 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
Total with kitchen sink garbage grinder
75
.20
Hotels and motels per room without private baths
50
.15
Hotels and motels per room with private baths
75
.15
Multiple -family dwellings or apartments
75
.20
Boarding and rooming houses
50
.15
Mobile home
75
.20
Mobile home park per space
300
.80
COMMERCIAL WASTEWATER:.
AVERAGE
GPD
BOD5 IN
POUNDS PER
DAY 444f..
PAGE 41
2013-3354
ORD2013-13
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
.02
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 and plants exclusive of industrial wastewater per
employee per eight -hour shift — no showers
20
.05
Factories and plants exclusive of industrial wastewater per
employee per eight -hour shift - showers provided
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 or construction camps semi -permanent with flush toilets
50
.17
Work or construction camps semi -permanent without flush
toilets
35
.02
:__ , :_
FOOD SERVICE ESTABLISHMENT
AVERAGE PD
C�
pops IN
POUNDS PER
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
,._
INSTITUTIONAL WASTEWATER WITHOUT KITCHENS
UNLESS OTHERWISE NOTED .�.
:.. „ ,,
fist,
AVERAGE
GPD
BODs I`
POUNDS PER
S. DAY `°
PAGE 42
2013-3354
ORD2013-13
Churches
5
.01
Hospitals per bed space
250
.20
Nursing homes per bed space
100
.17
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
" AVERAGES
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 **
50
.12
Travel trailer park without individual water and sewage hookup
per unit **
50
.12
*BOD levels need further verification
**Laundry facilities are to be calculated on a per commercial washer basis in accordance with other elements of this
table
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 Colorado
Department of Public Health and Environment, Water Quality Control Division under
section 43.13. of OWTS Regulation #43.
PAGE 43
2013-3354
ORD2013-13
B. CBOD5 strength must be reduced to Treatment Level TL1 or lower before applying to a
soil treatment area.
Table 30-6-3 Treatment Levels
Treatment Level
CBOD5* (mg/L)
TSS (mg/L)
Total Nitrogen (mg/L)
TL 1**
145
80
60-80
TL 2
25
,z.
30 "
60-80
TL 2NIA
30 i.
'50% reduction***
TL 3
10
10
40-60
TL 3N '
10
10
20' mg/L
(Shading indicates higher treatment levels)
*If concentrations of organic material are submitted in BODE without data in CBOD5, the data in BODE shall be
multiplied by 0.85 to estimate CBOD5 levels.
**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.
***NSF/ANSI Standard 245 — Wastewater Treatment Systems — Nitrogen Reduction requires reduction of 50
percent rather than an absolute value.
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 shall apply
unless the designer or design engineer determines by observation of the exposed slope of
PAGE 44 2013-3354
ORD2013-13
the dry gulch or cut bank or by profile holes or soil profile test pit excavations that a
restrictive layer is present that will direct or allow the effluent from the soil treatment area
to move laterally and surface.
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
shall 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 restrictive layer or the required depth
of soil comprising the soil treatment area.
PAGE 45
2013-3354
ORD2013-13
d
T
N
w
C
CdC
4G d
RI L
L rn
~ d
y LL
R t1
t0
d c
d E
t0
Y
S
r d
=
c a
O c
to
c —
ca
O 'y
T
r L
r c
d
R c
o o r
co O. f6
d E
Jo U =
c
2d M
2 t`
d r
m m
d L
d d
LL
c E
N >
d o
CO
C
N
O ut
OQ
cC d
O
N
O =
2
E
E
5
U Y
U F
I
to
to
to
o
I
o`
.. Y la
acC.
(..9m a O N
_ w
aU 1U
O
0
N
0
O
0
O
c -p
Y CD N N U N 0
- 8 Old U
O
502
Co
to
25
to
N
N
N
CV
N
253
8 c c _ m c N
ita rcip
a- E d 3 E L- j
co c y en - co
O
N
N
O
O
N
0
O
y 'C p -p 0 L
o 0oc_cw
2a. .zr 7 = C
a
0
a
O
O
0
0
0
rn-0m
c c
N 0=.�
pp m
0
5
O
0
to
r
r
r
125
o _T c
a .�. Q N
a> CLU
25
252
Li)
N
25
(O
N
O
N
V)
N
50
a T
a
pa, a
d> = J
O
N
N
N
N
N
N(O
N
N
O
C 0 m
.QN J
CO > CO
502
N
a
ID
o
0
O
r
0
CO
0
O
0
0
O
N
O
0
Septic Tank, Higher Level Treatment Unit,
Dosing Tank, Vault
Building Sewer or Effluent Lines
STA Trench, STA Bed, Unlined Sand Filter,
Sub -surface Dispersal System
Lined Sand Filter
Lined Evapo-transpiration Field or Outside of
Berm of Lined Wastewater Pond
Unlined Sand Filter in Soil With a Percolation
Rate Slower than 60 Minutes per Inch, Unlined
or Partially Lined Evapotrans-piration System,
Outside of Berm of Unlined Wastewater Pond,
or System Not Relying on STA for Treatment
Other than Aerosol
Vault Privy
System Not Relying on STA for Treatment and
Utilizing Aerosol Methods
LO
M
CO M
M
- N
00
fy
0
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
Division. Components that are not watertight should not extend into areas of the root system of nearby trees.
Includes 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. 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
shall 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 shall be sealed with an approved
underground sealant compatible with the piping used.
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.
PAGE 47
2013-3354
ORD2013-13
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
Depth in feet from soil treatment area
infiltrative surface to restrictive layer or
ground water
4 feet (3 feet with pressure dosing)
NOTE: Treatment levels are defined in Table 30-6-3.
ARTICLEVIII
I
DESIGN CRITERIA - GENERAL
Sec. 30-8-10. Performance
A. OWTS shall be designed and constructed to achieve the treatment level specified by the
design.
Sec. 30-8-20. Reliability
A. OWTS shall 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 shall be free of non-functional protrusions or sharp edges,
or other hazards, which could cause injury to persons, animals, or properties. Design shall
be such as to exclude flies and rodents and other vectors and to prevent the creation of
nuisances and public health hazards and shall provide for efficient operation and
maintenance.
PAGE 48
2013-3354
ORD2013-13
Sec. 30-8-30. Accessibility for Inspection, Maintenance, and Servicing
A. Septic tanks shall have risers over each access manhole and all risers shall extend to or
above final grade.
B. 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.
C. Riser Lids
1. Each riser lid brought to the surface shall have a secure closing mechanism, such as a
lock, special headed bolts or screws, or sufficient weight to prevent unauthorized
access.
2. A secondary plug, cap, cover or screen shall be provided below the riser cover to
prevent tank entry if the cover is unknowingly damaged or removed.
D. Components that require access for maintenance shall 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.
E. Components shall be designed and constructed so that, when installed, they shall be
easily maintained, sampled, and serviced according to the manufacturer's
recommendations. Easy physical access to treatment components by maintenance
personnel and equipment shall be provided.
Sec. 30-8-40. Plumbing Codes
A. Plumbing fixtures, building sewers, vents, sewer lines and other appurtenances shall be
designed, operated and maintained so as to comply with the minimum requirements
of the most recently revised locally enforceable plumbing code. In absence of a
local plumbing code, designs shall adhere to the Colorado Plumbing Code (3 CCR 720-1).
A local plumbing permit may be required.
Sec. 30-8-50. Electrical Equipment, If Used
A. All electrical work, equipment, and material shall comply with the requirements of the
currently applicable National Electrical Code as designated by the State Electrical Board
Rules and Regulations (3 CCR 710-1). A local electrical permit may be required.
B. Electrical components shall be protected from moisture and corrosive gases.
Sec. 30-8-60. Indicators of Failure or Malfunctioning for Systems Utilizing Mechanical
Apparatus
A. A signal device shall be installed which will provide a recognizable indication or warning
to the user that the system or component is not operating or is operating but
PAGE 49
2013-3354
ORD2013-13
malfunctioning. This indication or warning shall be a visual/ audible signal and shall 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 shall 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 shall be constructed.
Monitoring wells shall 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 shall
provide clear, concise written instructions covering the components which, when followed,
shall assure proper installation and safe and satisfactory operation and maintenance.
B. If the OWTS uses public domain technology, the design engineer shall provide clear,
concise written instructions covering the components which, when followed, shall assure
proper installation and safe and satisfactory operation and maintenance.
Sec. 30-8-90. Surface Activity
A. Activity or use on the surface of the ground over any part of the OWTS must be restricted
to that which shall allow the system to function as designed and which shall not contribute
to compaction of the soil or to structural loading detrimental to the structural integrity or
capability of the component to function as designed. During construction, equipment
shall be kept off of the ground surface above the soil treatment area and out of the
excavation to prevent compaction. If compaction occurs, the disturbed or compacted soil
shall be re-evaluated and new percolation tests may be performed to the disturbed or
compacted soil and the system redesigned if the parameters have changed.
Sec. 30-8-100. Floodplains
A. New OWTS and replacement OWTS installed in a 100 -year floodplain shall meet or
exceed the requirements of the Flood Management Ordinance contained in Chapter 23
and the Federal Emergency Management Agency. Repairs of an existing system shall
meet the requirements as feasible. The system as approved by the Division shall be
designed to minimize or eliminate infiltration of floodwaters into the system and discharge
from the system into the floodwaters. The Division has available a floodplain guidance
document.
PAGE 50
2013-3354
ORD2013-13
B. No new or expanded OWTS shall be installed in a floodway designated in a 100 -year
floodplain. For any system repair that may affect the floodway delineation, appropriate
procedures shall 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 shall:
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.
ARTICLE IX
DESIGN CRITERIA - COMPONENTS
Sec. 30-9-10. Tanks and Vaults
A. Watertightness
1. Septic tanks, vaults, pump tanks, other treatment components, risers and lids shall not
allow infiltration of ground water or surface water and shall not allow the release of
wastewater or liquids through other than designed openings.
2. 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 shall be anchored in a manner sufficient to provide stability when the
tank is empty. Risers shall 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 shall be prepared by the professional engineer.
C. Identification and Data Marking: All tanks and treatment units shall be permanently and
legibly marked in a location for the purpose of inspection that is readily visible when
inspected before backfilling. The marking inscription shall include the following:
PAGE 51
2013-3354
ORD2013-13
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 shall provide sufficient information to demonstrate that the tank will
meet the design specification.
B. Sizing Requirements:
1. Sizing for residential capacity for new installations shall 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
Tank Capacity (gallons)
2 or
1,000
4
1,250
Each Additional
250
2. For multi -family and non-residential applications, a septic tank shall 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. Testing of Septic Tank Watertightness
1. Testing of septic tanks must be performed and evaluated as specified in section 9 of
ASTM C1227-12 (Standard Specification for Precast Septic Tanks) for concrete tanks
or in Standard IAPMO/ANSI Z1000-2007 (American Standards for Prefabricated
Septic Tanks) for other prefabricated septic tanks.
2. Each unit shall be inspected in the field for conditions that may compromise its
watertightness.
PAGE 52
2013-3354
ORD2013-13
3. The inspection in the field shall 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 shall 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 shall hold no less than one-half of the required effective volume.
2. Inlet invert shall be at least two inches higher than the outlet invert.
3. Inlet tee or baffle shall extend above the surface of the liquid at least five inches and
shall extend a minimum of eight inches below the liquid surface.
4. Outlet tee or baffle shall extend at least 14 inches below the outlet invert and, if
needed, be modified to accommodate an effluent screen. 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 shall be at least ten
inches.
6. Liquid depth shall be a minimum of 30 inches and the maximum depth shall not
exceed the tank length.
7. The transfer of liquid from the first compartment to the second or successive
compartment shall 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 manhole no less than 20 inches across shall be provided in each
compartment of a septic tank.
9. A septic tank shall 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, shall 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 shall comply with the structural design criteria of ASTM
C1227-12 (Standard Specification for Precast Septic Tanks).
PAGE 53
2013-3354
ORD2013-13
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 Colorado
Department of Public Health and Environment, Water Quality Control Division for
acceptance.
4. Tank slab lids or mid -seam tanks shall be sealed to be watertight.
5. Connections between tank and risers shall be sealed to be watertight.
F. Fiberglass, Fiberglass -Reinforced Polyester, and Plastic Tanks
1. All fiberglass, fiberglass -reinforced polyester, and plastic tanks shall meet the
minimum design and structural criteria of IAPMO/ANSI Z1000-2007 (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 shall 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 shall be structurally sound and support external forces as specified in the
standard referenced above when empty and internal forces when full. Tanks shall not
deform or creep resulting in deflection of more than five percent in shape as a result of
loads imposed.
4. All tanks shall 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 shall 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 30-4-120.6.3.
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 shall 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 shall be filled with gravel, sand or compacted soil; and
PAGE 54
2013-3354
ORD2013-13
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 lines used in an OWTS shall be constructed of compatible pipe, primer,
bonding agent, and fittings.
2. Where unperforated plastic pipe and fittings are used for gravity flow, the minimum
wall thickness of the pipe shall 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 shall 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 shall 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,
shall be bedded with select material before final inspection by the Division. Select bedding
material shall 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. Distribution Box
A. A distribution box, if used, shall be of sufficient size to distribute effluent equally to the
lateral lines of a trench or absorption bed system. The box shall be constructed with the
inlet invert at least one inch above the level of the outlet inverts. Flow equalizers or
similar devices shall be used to adjust the flow between lines. Access to the box shall 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
PAGE 55
2013-3354
ORD2013-13
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. Outlet lines from the distribution box to the laterals shall be of solid wall pipe for a
minimum of five (5) feet.
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. 30-9-60. Drop Box
A. 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 lines in sequential distribution shall be
designed and installed so that they may be capped off for resting periods.
Sec. 30-9-70. Stepdown/Relief Line
A. 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. 30-9-80. Wastewater Pumping and Dosing Siphon Systems
A. Pumps
1. Non -clog pump opening shall have at least two-inch diameter solids handling capacity
where raw wastewater is pumped. A pump opening shall 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 without removing the pump.
PAGE 56
2013-3354
ORD2013-13
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.
C. Location of Pump or Siphon
1. A pump may be, or a siphon shall be, installed in a separate tank following the septic
tank and be of sufficient volume to allow pump or siphon cycling commensurate with
the design capacity. The use of a three -compartment septic tank, sized to provide
effective volume in the first two compartments with the pump in the third compartment,
is acceptable.
2. The second compartment of the septic tank shall not be used as the pump tank unless
it can be demonstrated to the satisfaction of the local public health agency that the
minimum 48 -hour detention time will not be decreased and the pump is screened or
provided with an approved filtering device to assure that only liquid effluent will be
discharged.
D. Pump or Siphon Discharge Piping
1. The discharge line from the pumping or siphon chamber shall be protected from
freezing by burying the pipe below frost level or sloping the pipe to allow it to be
self -draining. Drainage shall be provided through the bottom of the pump or through
a weep hole located in the discharge line prior to exiting the tank.
2. The pump discharge piping shall have a quick disconnect that is accessible within the
riser to allow for easy pump access and removal.
3. The pipe shall be sized to maintain a velocity of two or more feet per second.
4. Automatic air/vacuum release valves shall be installed at high points in the pressure
line where necessary to prevent air or vacuum locking and allow self draining of the
lines.
E. Access
1. The pump or dosing system tank, chamber, or compartment shall have a minimum
24 -inch diameter access riser, made of corrosion -resistant material, extending to or
above ground level.
2. The access riser must have a watertight connection to the pump or dosing
chamber/compartment to prevent infiltration or exfiltration.
F. Splice Box
1. Splice boxes shall be located outside the pump system access riser and be accessible
from the ground surface.
PAGE 57
2013-3354
ORD2013-13
2. No wire splices shall be made inside the tank, dosing chamber or riser. Wire splicing
shall be completed with corrosion -resistant, watertight connectors.
G. Controls
1. The pump system shall have an audible and visual alarm notification in the event an
excessively high water condition occurs.
2. The pump shall be connected to a control breaker separate from the high water alarm
breaker and from any other control system circuits.
3. The pump system shall have a switch so the pump can be manually operated.
4. The pump system for pressure dosing and higher level treatment systems shall have a
mechanism for tracking either the amount of time the pump runs or the number of
cycles the pump operates.
5. Control panels shall be UL listed.
Sec. 30-9-90. Effluent Screens
A. If a pump or dosing siphon is used to remove septic tank effluent from the final
compartment of the septic tank, an effluent screen must be provided prior to the pump or
siphon inlet. A pump vault equipped with a filter cartridge may be considered equivalent
to an effluent screen preceding the pump.
B. The effluent screen, if used, shall 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.
Sec. 30-9-100. 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.
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 shall be based on the results of the site and
soil evaluation, design criteria, and construction standards for the proposed site and
OWTS selected.
PAGE 58
2013-3354
ORD2013-13
B. At proposed soil treatment area locations where any of the following conditions are
present, the system shall be designed by a professional engineer and approved by the
local public health agency:
1. The soil classifications are Types 0, 3A, 4, 4A, and 5 as specified in Table 30-10-1 of
this Regulation;
2. The maximum seasonal level of the ground water surface is less than four feet below
the bottom of the proposed absorption system;
3. A restrictive layer exists less than four feet below the bottom of the proposed
absorption system;
4. The ground slope is in excess of thirty percent; or
5. Pressure distribution is used.
Sec. 30-10-30. 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.
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)
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 storage/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.
PAGE 59
2013-3354
ORD2013-13
Long Term Acceptance Rate
(LTAR); Gallons per day per
square foot
All Treatment Levels
Minimum 3 foot deep unlined sand
filter required ,
1.0 LTAR
o
co
O
0
(O
O
0
( O
O
to
M
6
o
M
O
o
Nr
O
c
:O
O
O
Soil Type, Texture, Structure and Percolation Rate Range
Percolation Rate
(MPI).
(()
V
to
N
O
V'
N
O
(D
V
L')
CO
O
r
o
+
N
USDA Soil
Structure -Grade
Single Grain (0)
Single Grain (0)
2 (Moderate)
3 (Strong)
1 (Weak)
Massive
CO
N
1 '
Massive
C)
N
1
Massive
M
N
USDA Soil
Structure -Shape
PR (Prismatic) BK
(Blocky)
GR (Granular)
PR, BK, GR
0 (none)
PR, BK, GR
PR, BK, GR
0'
PR, BK=,GR
PR, BK, GR
0
um
a
USDA Soil Texture
Soil Type With more than
35% Roe t2mm); Soil t'
Types 2-5 with more than
50% Rock (>2mm)
Sand, Loamy Sand
Sandy Loam, Loam, Silt
Loam
Sandy Loam, Loam, Silt
Loam
Sandy Clay Loam, Clay
Loam, Silty Clay Loam
Oki
Sandy Clay Loam, Clay
Loam, Silty Clay Loam
Sandy Clay, Clay, Silty
Clay
Sandy Clay, Clay, Silty
Clay
Soil Types 2-4A
Soil Type
0
r
N
M
M
1'
4A
U)
T Cr)
Nr
7 0
Z
� LL
°
it O
O
co tr. co M
cs
O
N
(vi
a1
O
M
1
0
M
O
U
co
O
0
0
U
N
Co
W
ct
Q
E
m
m
0
w w
c m.
Er) as
d e
0 ofO.
y(O m
boy
o m
asoa
mti�
a e y
ca m
m
)L
0 m0 w
c
m N
CO
Ca
d c
mm
(C E
m
a
d
a
iN
0)
Sec. 30-10-40. Allowable Soil Treatment Area Reductions and Increases
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.
C. The maximum reduction from all combined reductions shall be no greater than 50 percent
of the baseline system required for a soil treatment area.
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
Rock or Tire
Chips
Manufactured
Media Other Than
Chambers
Chambers
Trench or Bed
1.0
0.9
0.7
Sec. 30-10-50. Design of Distribution Systems
A. General
1. The infiltrative surface and distribution lines must be level.
2. The infiltrative surface must be no deeper than four feetunless adequate treatment at a
deeper level can be demonstrated and is approved by the Division.The depth will be
measured on the downslope side of the trench or bed.
PAGE 61 2013 -[Document Number]
ORD2013-13
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 shall 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.
B. Distribution Lines
1. Distribution between lines in a soil treatment area must be as even as possible.
Uneven settling of portions of the distribution system following construction must be
addressed by provisions in the design to adjust flows between lines.
2. Distribution lines shall be a maximum of 150 feet long.
3. Distribution lines longer than 100 feet shall be pressure dosed or the application of the
effluent shall be at the center of the line.
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.
5. Inspection Ports
a. An inspection port accessible from ground surface must be installed at the terminal
end of each line. The bottom of the inspection port tube must extend to the
infiltrative surface and not be connected to the end of the distribution pipe.
Inspection ports in chambers may be installed according to manufacturer's
instructions if the infiltrative surface is visible or can be measured from the
inspection port.
b. Additional inspection ports connected to distribution pipes may be installed.
c. The top of inspection ports may be below the final grade of the surface if each has
a cover at the surface such as a valve box for a lawn irrigation system.
PAGE 62 2013 -[Document Number]
ORD2013-13
6. Trenches
a. Trenches must be three feet wide or less.
b. The separating distance between trenches must be a minimum of six feet
sidewall-to-sidewall.
c. Perforated distribution pipe used in a trench must be as close to the center of the
trench as possible.
d. Perforations must be oriented downward unless pressure distribution is used and
provision for pipe drainage is included.
7. Beds
a. Maximum width for a bed shall be 12 feet, unless the bed receives effluent meeting
Treatment Level 2 quality or better.
b. The separation distance between beds must be a minimum of six feet
sidewall-to-sidewall.
c. The separating distance between parallel distribution lines in an absorption bed
must not exceed six feet and a distribution line must be located within three feet of
each sidewall and endwall of the absorption bed.
8. Serial and Sequential Distribution:
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.
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.
c. Adjacent trenches or beds must be connected with a stepdown/relief line 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.
C. Storage/Distribution Media
1. Rock and Pipe
a. The 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. At least six
inches of gravel, rock or other material must be placed below the pipe. The
gravel, rock or other material must fill the trench around the pipe and at least two
inches above the top of the distribution pipe.
PAGE 63 2013 -[Document Number]
ORD2013-13
b. 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.
2. Tire Chips
a. The pipe may be surrounded with clean, uniformly -sized tire chips.
b. 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.
c. Wire strands must not protrude from the tire chips more than 0.75 inches.
d. Tire chips must be free from balls of wire and fine particles less than two mm
across.
e. 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.
3. Chambers
a. Chambers must be installed with the base on the infiltrative surface.
b. Installation must be according to manufacturer's instructions.
c. Effluent may be distributed by gravity or pressure dosing.
4. Manufactured Media
a. Manufactured media must be installed with the base on the infiltrative surface.
b. Installation must be according to manufacturer's instructions.
c. Effluent may be applied by pressure distribution only if the manufacturer specifies
suitability of the product for that use.
5. Pressure Distribution
a. Design of pressure distribution systems must include:
1) Dose size and frequency for flows and soil or media long-term acceptance
rate;
2) Pipe diameter and strength requirements;
3) Orifice size and spacing; and
PAGE 64 2013 -[Document Number]
ORD2013-13
4) Distal pressure head.
b. Cleanouts must be installed at the end of each line.
6. Driplines
a. 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.
b. Driplines must be installed on manufacturer's spacing recommendations.
c. Drainback must be provided for all drip lines, pipes and pumps.
d. Provisions must be made to minimize freezing in the distribution lines, driplines,
relief valves, and control systems.
e. Provisions must be made for backflushing or other cleaning.
Sec. 30-10-60. Alternating and Sequencing Zone Systems
A. Alternating Systems
1. An alternating system must have two zones that must be alternated on an annual or
more frequent basis.
2. Each section must be a minimum of 50 percent of the total soil treatment area. Size
adjustment factors for methods of effluent application or type of distribution media
shall not be allowed.
3. A diversion valve or other approved diversion mechanism 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.
B. Sequencing Zone Systems
1. Sequencing zone systems have more than two soil treatment area sections that are
dosed on a frequent rotating basis.
2. Where soil conditions are similar between the sections, each section area shall 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.
PAGE 65 2013 -[Document Number]
ORD2013-13
Sec. 30-10-70. Dosing
A. Dosing may be used for soil treatment area distribution. The dose must be sized to
account for the daily flow and the dosing frequency. Dosing systems must be designed by
a professional engineer.
Sec. 30-10-80. Lift Stations
A. Lift stations intended solely for the purpose of delivering sewage to a septic tank or septic
tank effluent to a non -engineered 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. 30-10-90. Soil Replacement
A. Soil replacement is permitted to bring the soil within the requirements of suitable soil.
Added soil must meet the specifications of sand filter media, as specified in section
30-11-30.6.1. All added soil must be completely settled prior to installation of
components as specified and approved by the design engineer. The loading rate for
sand filters must be used. Pressure distribution must be used.
Sec. 30-10-100. 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 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. Wide Beds: For repairs, beds may be wider than 12 feet without being required to receive
effluent meeting Treatment Level 2 quality or better.
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)
(W+1+2D)
Where:
L = length of trench prior to adjustment for deep gravel
W = width of trench or bed 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.
PAGE 66 2013 -[Document Number]
ORD2013-13
3. Percolation tests and soil profile hole or soil profile excavation test pit evaluations must
be performed at the proposed infiltrative surface depth. (soil profile borings will not be
allowed after July 1, 2016)
4. The reduction in field size area with the use of chambers must not be applied to deep
gravel systems.
D. Vaults
1. The allowable use of vaults for repairs must meet the criteria specified in section
30-12-40 of this Regulation.
E. Higher Level Treatment Options
1. Design criteria for higher level treatment systems are in Article Xl.
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.
PAGE 67 2013 -[Document Number]
ORD2013-13
Sec. 30-11-20. Treatment Levels
A. The treatment levels identified in Table 30-6-3 are specified in this section for public
domain technology, and proprietary treatment systems shall 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. Sand filters, such as a lined intermittent sand filter or recirculating sand filter, may be used
as a pre-treatment system where the treated effluent is collected and dispersed to a soil
treatment area or where site conditions require importing treatment media, such as an
unlined sand filter, a soil replacement system, or a mounded system.
B. Intermittent (Single Pass) Sand Filters
1. General
a. The filtering material used in a sand filter must be clean, coarse sand, all passing a
screen having four meshes to the inch. The sand must have an effective size
between 0.25 and 0.60 mm. The uniformity coefficient must be 4.0 or less.
Material meeting ASTM 33, for concrete sand, with one percent or less fines
passing 200 mesh sieve may be used.
b. The sand below the distribution lines must be at least two feet deep.
c. Distribution system
1) Dispersal of effluent to the surface of the sand filter must be by a pressurized
distribution system for equal distribution.
2) Pipes used to disperse the effluent must be surrounded by washed coarse
screened gravel or crushed stone. All of the gravel or stone must pass a 2
1/2 -inch screen and must be retained on a 3/4 -inch screen.
3) Manufactured media may be used as an alternative to gravel or stone.
4) The separation distance between parallel distribution lines must not exceed six
feet, and a distribution line must be located within three feet of each filter
sidewall.
d. Application Rates
1) A maximum sand filter application rate of 1.0 gpd/ft2 must be used.
2) An intermittent sand filter must not be used to treat wastewater that does not
conform to TL1 treatment level or better.
2. Lined Sand Filters
PAGE 68 2013 -[Document Number]
ORD2013-13
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. A minimum four -inch diameter under -drain pipe must be used. The under -drain
pipe must be surrounded by washed coarse screened gravel or crushed stone. All
of the gravel or stone must pass a 2 1/2 inch screen and must be retained on a
3/4 -inch screen. Manufactured media may be used as an alternative to gravel or
stone.
c. Under -drain effluent collected below the sand filter shall be dispersed to a soil
treatment area.
3. Unlined (Open Bottom) Sand Filters
a. The bottom of the sand filter must be no less than two feet above the high ground
water surface or bedrock for installations in which effluent percolates downward
through the soil.
b. An unlined sand filter is to be sized based on section 30-11-30.B.1.d.(1).
4. Mounded Sand Filters (Mound Systems)
a. When the infiltrative surface area of the media receiving wastewater effluent is
above the natural ground surface, the system shall be considered a mounded
sand filter.
b. Mounded sand filters must conform to section 30-11-30.B.3.for unlined (open
bottom) sand filters.
c. The basal area and linear loading rate must be determined from the loading rate
for the soil type under the mound and the slope of the site.
d. The final slope of the mound must be no greater than three feet horizontal to one
foot vertical.
e. The surface of the mounded area must be planted with a suitable vegetative cover.
C. Recirculating Sand Filters
1. A recirculating sand filter 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.
2. A minimum four -inch diameter under -drain pipe must be used. The under -drain pipe
must be surrounded by washed coarse screened gravel or crushed stone. All of the
gravel or stone must pass a 2 1/2 -inch screen and must be retained on a 3/4 -inch
screen. Manufactured media may be used as an alternative to gravel or stone.
a. Filter media effective size (D10) must range from 1.0 to 1.50 mm and the uniformity
coefficient (D60/D10) must be less than 4.0. Fines passing a 200 mesh sieve
must be less than one percent.
PAGE 69 2013 -[Document Number]
ORD2013-13
3. Sand depth must be a minimum of two feet.
4. Typical loading rates are 3.0 to 5.0 gpd/ ft2. Rate must not exceed 5.0 gpd/ ft2.
5. Design re -circulation ratios may be 3:1 to 5:1.
6. Effluent collected from the sand filter must be discharged to a soil treatment area.
Sec. 30-11-40. 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. Wastewater Remaining After Separation of Toilet Wastes
A. An OWTS treating the wastewater remaining after the separation of the toilet wastes must
meet all minimum design and construction standards for a TL1 OWTS based on the
volume and character of wastes for the fixtures and the number of persons to be served.
Sec. 30-12-20. Evapotranspiration and Evapotranspiration/Absorption Systems:
A. An evapotranspiration system may be designed to consider evaporation and transpiration
only, or in soil types 3A, 4, 4A and 5, absorption may also be considered.
1. An evapotranspiration system or evapotranspiration/absorption system must be
designed by a professional engineer.
2. Data to be furnished must include, but shall not be limited to: dimensions; distribution
system design; specifications of gravel and wicking sand if used, liner material if used,
and bedding; properties of the soil under the evapotranspiration system and provision
for vegetation cover.
3. The following formula may be used as a guide for determining the 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)
PAGE 70 2013 -[Document Number]
ORD2013-13
4. As an alternative, a system may be designed and sized on the basis of a monthly
water balance for the system. Such a design would provide for total storage of
average daily flows for all periods in which evapotranspiration is not shown to occur.
5. If the design provides wicks (sand structures which penetrate through the rock media
to the bottom of the bed), they must be equal to 10 to 15 percent of the bed surface
area. The wicks must be uniformly spaced throughout the bed.
6. Sand utilized in evapotranspiration or evapotranspiration/absorption beds for wicks
must meet the gradation requirements in Table 30-12-1 and be approved by the
design engineer.
Table 30-12-1
Gradation of Wicking Sand for Evapotranspiration Beds
Sieve Size
Percent Passing
4
100
40
50-70
200
<15
7. Adequate surface area must be provided to evaporate/transpirate total annual
average daily flows at a rate equivalent to local net lake evaporation including over
the part of the year when the evaporation rate is not measured.
8. If the system is designed as an evapotranspiration/absorption system, the amount
of storage and evapotranspiration capacities may be reduced by the volume of
effluent absorbed by the soil based on the long-term acceptance rate for that soil
type.
9. 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.
10. Evapotranspiration beds and evapotranspiration -absorption beds may be wider
than 12 feet.
Sec. 30-12-30. Wastewater Ponds
A. Construction of new wastewater ponds for single-family homes is prohibited.
B. A septic tank must precede the wastewater pond.
C. The depth of the design volume of the wastewater pond must be five feet.
D. A wastewater pond must have two feet of free board above the design volume of the pond.
PAGE 71 2013 -[Document Number]
ORD2013-13
E. A wastewater pond must be fenced to keep out livestock, pets, vermin, and unauthorized
people.
F. Wastewater ponds must be designed on the basis of monthly water balance including
design flow, precipitation, evaporation, and seepage.
G. 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.
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.
Sec. 30-12-40. Vaults 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-day design wastewater flow, whichever is larger.
PAGE 72 2013 -[Document Number]
ORD2013-13
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.
G. Vault Privy
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.
2. 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.
3. A signal device is not required for a vault privy.
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
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. 30-12-50. Incinerating, Composting and Chemical Toilets
A. Only incinerating and composting toilets receiving review and acceptance by the Water
Quality Control Division may be permitted. Incinerating and composting toilets shall bear
the seal of approval of the NSF or an equivalent test and certification program.
B. 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.
C. 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.
PAGE 73 2013 -[Document Number]
ORD2013-13
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.
E. Composting Toilets
1. 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.
2. 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.
3. 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.
4. If a system will be installed where low temperature may be a factor, design and
installation must address the effects of the low temperature.
5. Composting toilets must be operated according to manufacturer's specifications.
F. 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. 30-12-60. 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
PAGE 74 2013 -[Document Number]
ORD2013-13
3. Not pose a potential health hazard or private or public nuisance or undue risk of
contamination.
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 fecal coliform density must not exceed 25 per 100
milliliters when averaged over any five consecutive samples, and no single sample
result for fecal coliform can exceed 200 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 coliform density must not exceed 500 per 100
milliliters when averaged over any five consecutive samples, and no single sample
can exceed 5000 fecal coliform 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 fecal coliform, 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:
PAGE 75 2013 -[Document Number]
ORD2013-13
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
A. 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
A. 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.
PAGE 76 2013 -[Document Number]
ORD2013-13
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.
PAGE 77 2013 -[Document Number]
ORD2013-13
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
Chart showing the percentages of clay (below 0.002 trim.).
silt (0.002 to 0.05 mm.). and sand (0.05 to 2.0 mm.) in the basic soil
textural classes.
From: USDA Soil Survey Manual
5,L-13,7148
PAGE 78 2013 -[Document Number]
ORD2013-13
APPENDIX 30-B
SOIL CLASSIFICATION SYSTEM (SOIL -SEPARATE SIZE LIMITS)
SOURCE: EPA Design Manual for Onsite Wastewater Treatment and Disposal Systems
NAMES AND SIZE LIMITS OF PRACTICAL -SIZE
CLASSES ACCORDING TO .SIX SYSTEMS
SYSTEM
• I. U.S. OurtlU of
Iie Iamanon and
Corps of Engmoatslll S
OW. GI Eno Aim,)
2. Amuutan Assocraiion•
'01 Sratu Iliyhway .
Officals
3. Amorican Seca i, ICI
Tourng and MaroroIs
4 Woniwurilr
t 5. U.S. Aaparnnenhah
Agritultw o
5.Inlornadonal Saeruly
of Sou Saienec •
• 0
I - I . r.er T I
Silt and Clay
Idissinguisiwll on nut. �
Oasis aipin)IIGIly)..
i _
. Fine sand
UTTTTI
Manium
said
I I1'E!II
Cwnse
wad
HMI yravVl
..17"r17
Cod. se'
Wavut •
Cobnlds
'.,-..^..1Ciay��
Colloids
I
'
?Ina sand
•
Caruso sand
rims iliwvdl
11Sill'
Mddiu11i
Usual
Cuai ►u
yravtr
Oa.dddrs
Clay —r
r
ISIN.::.
Cnilalds
rine eea.i
Medina% Cuarsir
• solid sand
'Gravel
•W
Clay
..
..
:. Sill . Very
saA6
._
Ma
sand
Vari
Mudr1i a coaue
s.uul,• .•uaisnnd•.
Gl:mulch
... rind. : I
l
publdei Cob6ins
• •
•,.
Clay _
'. Slit ..!L11nfFIn.
•e
.
M�dn
sand '
. -
.:Very
tear au.
coats. .
sandy. .
: .
gravel
. .
Coarse gravel
CobblaOM?
.'CIa"y
,n„ i-__I_ia.i-#.a1i
Snl:.
Flna sand-
, I;.rii
Chaos* sand..
I —.I 4,a
. Gs ave. •
, . i.'..:r •�.". .•, ...a
'
0,2
Panicle dlnnererl mm,
PAGE 79
•
2.0
i
K•
?00
2013 -(Document Number]
ORD2013-13
APPENDIX 30-C
ANNUAL FREE WATER SURFACE
EVAPORATION MAP OF WELD COUNTY
ADAPTED FROM NOAA TR NWS 33
UNITS: INCHES/YEAR
45
40
•
Nunn
•Briggsdaie
tiffndscr
. Greeley •
•
Johnstown
�1r£rie
40
Ft l upton
'45
PAGE 80 2013 -[Document Number]
ORD2013-13
BE IT FURTHER ORDAINED by the Board that the Clerk to the Board be, and hereby is,
directed to arrange for Colorado Code Publishing to supplement the Weld County Code with the
amendments contained herein, to coincide with chapters, articles, divisions, sections, and
subsections as they currently exist within said Code; and to resolve any inconsistencies regarding
capitalization, grammar, and numbering or placement of chapters, articles, divisions, sections,
and subsections in said Code.
BE IT FURTHER ORDAINED by the Board if any section, subsection, paragraph,
sentence, clause, or phrase of this Ordinance is for any reason held or decided to be
unconstitutional, such decision shall not affect the validity of the remaining portions hereof. The
Board of County Commissioners hereby declares that it would have enacted this Ordinance in
each and every section, subsection, paragraph, sentence, clause, and phrase thereof irrespective
of the fact that any one or more sections, subsections, paragraphs, sentences, clauses, or
phrases might be declared to be unconstitutional or invalid.
The above and foregoing Ordinance Number 2013-13 was, on motion duly made and
seconded, adopted by the following vote on the 20th day of January, A.D., 2014.
BOARD OF COUNTY COMMISSIONERS
WELD COUNTY, COLORADO
ATTEST:
William F. Garcia, Chair
Weld County Clerk to the Board
Douglas Rademacher, Pro-Tem
BY:
Deputy Clerk to the Board
Sean P. Conway
APPROVED AS TO FORM:
Mike Freeman
County Attorney
Barbara Kirkmeyer
Publication:
First Reading:
Publication:
Second Reading:
Publication:
Final Reading:
Publication:
Effective:
November 8, 2013
December 9, 2013
December 18, 2013, in the Greeley Tribune
December 30, 2013
January 8, 2014, in the Greeley Tribune
January 20, 2014
January 29, 2014, in the Greeley Tribune
February 3, 2013
PAGE 81 2013 -[Document Number]
ORD2013-13
Hello