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Home My WebLink About20151738.tiff SITE SPECIFIC DEVELOPMENT PLAN AND USE BY SPECIAL REVIEW (USR) APPLICATION FOR PLANNING DEPARTMENT USE DATE RECEIVED: RECEIPT # /AMOUNT # /$ CASE # ASSIGNED: APPLICATION RECEIVED BY PLANNER ASSIGNED: Parcel Number 1 2 1 1 _ 3 4 _ 0 _ 0 0 _ 0 0 8 (12 digit number - found on Tax I.D. information, obtainable at the Weld County Assessor's Office, or www.co.weld.co.us) Legal Description 16681 SE1/4 34-3-66 (4R6D) 15725 26CR , Section 34 , Township 3 North, Range 66 West Zone District: Agriculture , Total Acreage: 150 Acres , Flood Plain: NO , Geological Hazard: No Airport Overlay District: No FEE OWNER(S) OF THE PROPERTY: Name: ANADARKO E & P COMPANY LP Work Phone # 720-929-6160 Home Phone # Email tracy.colling@anadarko.com Address: 1099 18th Street, Suite 1800 Address: City/State/Zip Code Denver, CO 80202 Name: Work Phone # Home Phone # Email Address: Address: City/State/Zip Code Name: Work Phone # Home Phone # Email Address: Address: City/State/Zip Code APPLICANT OR AUTHORIZED AGENT (See Below: Authorization must accompany applications signed by Authorized Agent) Name: Tracy Coiling - Kerr McGee Gathering, LLC Work Phone # 720-929-6160 Home Phone # Email tracy.colling@anadarko.com Address: 1099 18th Street, Suite 1800 Address: City/State/Zip Code Denver, CO 80202 PROPOSED USE: Natural gas compressor station to assist in the transport of products to processing facilities. I (We) hereby depose and state under penalties of perjury that all statements, proposals, and/or plans submitted with or contained within the application are true and correct to the best of my (our)knowledge. Signatures of all fee owners of property must sign this application. If an Authorized Agent signs, a letter of authorization from all fee owners must be included with the application. If a corporation is the fee owner, notarized evidence must be included indicating th t t e signatory has to legal authority to sign for the corporation. 0 �i !i I7 Sig ature: Own or Authorized n Da e I Signature: Owner or Authorized Agent Date i 6 ft .i. 4 i::', DEPARTMENT OF PLANNING SERVICES 1555 N 17i" AVE 0 GREELEY, CO 80631 PHONE: (970) 353-6100, Ext. 3540 COLORADO FAX: (970) 304-6498 AUTHORIZATION FORM I Tracy Coiling represent Anadarko E&P Comp_any, LP for the property (Agent/Applicant) (Owner) located at 1099 18th St. , Ste 1800 Denver, Colorado 80202 LEGAL DESCRIPTION: SEC 34 TWN 3 RNG 66 SUBDIVISION NAME: LOT BLK I can be contacted at the following phone #'s: Home Work 720-929-6160 Fax # 720-929-7160 The property owner can be contacted at the following phone #'s Home Work Fax # Correspondence mailed to (only one): E Agent/Applicant • Property Owner 12- 1 -2014 DATE OWNER'S SIGNATURE \_,Ame"-ii1/4„..ji (it -- Michael A. Nixson, Land Director 1 SECTION 1 1 . DESCRIPTION OF PROPOSED USE: This USR application is referred to as the Cannon Compressor Station application and is submitted by Kerr-McGee Gathering, LLC (KMGG), a subsidiary of Anadarko Petroleum Corporation (APC). APC and KMGG operate nearly 5,000 oil and gas wells in the Denver-Julesberg (DJ) Basin with the vast majority being located in Weld County, Colorado. All of these wells produce varying amounts of natural gas that need to be routed via a system of underground pipelines through a number of compressor stations in Weld County. A compressor station helps the transportation process of natural gas from one location to another. Natural gas, while being transported through a pipeline, needs to be constantly pressurized in certain distance intervals (from 4 up to 100 miles). The gas in the compressor station is pressurized by special turbines, motors and engines. The proposed site is owned by Anadarko E & P Company, LP and will be leased by KMGG. It is located less than one 1/2 mile northwest of the intersection of Weld County Road 26 and Weld County Road 33. It is currently zoned Agriculture and surrounded by parcels that are also zoned Agriculture. The use is currently undeveloped rangeland with several natural gas well heads with associated small condensate tanks. The proposed installation outlined in this application, includes various compression equipment that will be used to compress and transport natural gas. The equipment being proposed will include compressors, vapor recovery units, separators, dehydrators, launchers, coalescers, storage tanks and additional supporting compression equipment. There will also be an electric switch yard consisting of a transformer to step down the incoming distribution voltage from 69 kV to 12.7 kV. The transformer is placed outside of the compressor station's fence line for safety and visual reasons. This allows the burial of the low voltage lines into the station instead running the larger power lines overhead across the parcel into the station. A communications tower is also proposed, to allow the site to be operated remotely. The communications tower will be a 70 foot tall tower and powered from the Compressor Station UPS. There will be 1 -2 dishes on the tower and it will handle all communications on site, and co-location will be possible. Please see the Site Plan in the Appendix for a more detailed layout and description of the proposed equipment and a reasonable facsimile of the communications tower. The compressors on site operate 24 hours a day, 7 days a week, 365 days a year. However, the station will automatically adjust to run only those engine-compressors needed to adequately handle the volume of gas flowing through the pipeline. Facility Ownership: Cannon Compressor Station Kerr-McGee Gathering, LLC 1099 18th St., Suite 1800 Denver, CO 80202 2. CONSISTENCY WITH THE INTENT OF THE WELD COUNTY CODE, CHAPTER 22 OF THE COMPREHENSIVE PLAN The Weld County Comprehensive Plan addresses goals and policies for agriculturally zoned properties, oil and gas deposits, as well as environmental pollutants that the compressor site may emit. Goal 6 of the Comprehensive Plan encourages the division of land in agricultural areas to support the continuation of Cannon Compressor Station T3N-R66W Sec 34 Weld County, Colorado 2 agricultural production. The site is currently owned by APC, and used for agricultural purposes. Finally, the Comprehensive Plan addresses the presence of oil and gas deposits in the county and encourages the extraction of oil and gas resources that conserve the land and minimize the impact on surrounding land and the existing surrounding land uses. The proposed addition of a Compressor Site conserves land by eliminating the need for an additional separate compressor site elsewhere in Weld County. The proposed use is consistent with Chapter 22 and any other applicable code provisions or ordinance in effect. Section 22-5-100.A. (OG.Goal 1 .) states, " Promote the reasonable and orderly exploration and development of oil and gas mineral resources," while Section 22-5-100.B. (OG.Goal 2.) strives to, "Ensure that the extraction of oil and gas resources conserves the land and minimizes the impact on surrounding land and the existing surrounding land uses." Section 22-5-100.B., (OG.Policy 2.9.) outlines the objective to, "Impose protective measures through available state, County and federal regulations to ensure that the mineral operator conducts operations in a manner that will minimize current and future environmental impacts." The request for a Site Specific Development Plan and a Special Review Permit for a Mineral Resource Development Facility, including Oil and Gas Support and Service: specific to oil and gas processing facilities and related equipment, including, but not limited to, eight (8) compressors associated with gas processing, being part of a new compressor, pipeline and gas processing network necessitated by the need to move larger volumes of gas due to the recent increases in drilling activity and projected additional production increases anticipated by producers. 3. CONSISTENCY WITH THE INTENT OF THE WELD COUNTY CODE, CHAPTER 23 (ZONING) AND THE ZONE DISTRICT IN WHICH IT IS LOCATED. Oil and gas facilities are allowed as a use by right in the A (Agricultural) Zone District. However, oil and gas support and service operations such as a Compressor Facility require the approval of a Use by Special Review Permit. The proposed use is consistent with the intent of the A (Agricultural) Zone District. Section 23-3-40.A.2 of the Weld County Code provides for Oil and Gas Support and Service, and Section 23-3-40.L of the Weld County Code provides for a communications tower greater than 70 feet in height as a Use by Special Review in the A (Agricultural) Zone District. 4. SURROUNDING USES AND COMPATIBILITY WITH SURROUNDING USES. There are currently no USR permits on the proposed site. The proposed facility does not interfere with the existing use of the area, and remains compatible with the current zoning. 5. DETAILS OF THE SITE a. Number of people who will use this site There are no permanent employees on this site. The site is visited by a KMGG/APC employee on a daily basis. The employee is typically not on site for longer than one to two hours at a time. Given the short amount of time an employee is on site, KMGG believes that a permanent water and sewer service is not necessary. The site is monitored 24 hours a day 7 days a week by the computers at the company's gas control centers in Brighton and Denver. Bottled water and a port-a-let will be utilized by personnel visiting the facility b. Number of employees proposed to be employed at this site There will be no full time employees at the Cannon Compressor Station. One employee may visit the site on a daily basis. Cannon Compressor Station T3N-R66W Sec 34 Weld County, Colorado 3 c. Hours of operation The compressors on site run 24 hours a day 7 days a week based on demand. On average one employee will visit the site once each day in a pick-up truck. Trucks will generally only come to the site during the hours of 8 am to 5 pm unless there is an emergency. d. Type and number of structures to be built on this she Please see the Site Plan in the Appendix for a more detailed layout of all proposed buildings and communication tower. e. Type and number of animals There are no animals on site. f. Kind of vehicles that will access this site and how often A KMGG/APC employee will visit the site once each day in a pick-up truck. Larger vehicles with trailers may come to the site for delivery, repair, and maintenance purposes only, on a periodic basis. g. Fire Protection The Platteville-Gilcrest Fire Protection District provides fire protection to this area. A referral packet will be sent to the District by the County. h. Water source on the property There are no full time employees on site. A KMGG/APC employee will visit the site on a daily basis. Due to the lack of employees permanently on site, a water connection is not necessary. Should the status of employees on site change, water would be requested from Central Weld County Water District or obtained from a new well on site as appropriate. Bottled water will be available during construction and during operation. L Sewage disposal system There is no need for a sewer disposal system. Employees will have access to use a port-o-let at the Cannon Compression Station. This facility will be serviced by Waste Management for waste removal. A small dumpster and will also be on site. Should a water source later be required, there appears to be ample space on the lot to provide for an ISDS for sewage disposal. j. Storage or warehousing No additional storage or warehousing is proposed for this facility. 6. PROPOSED LANDSCAPING It is anticipated that the facility will be enclosed with a chain link fence approximately 6 to 7 feet high with a potential 3 foot outrigger and barbed wire to prohibit vandalism and theft not only during the construction phase but also as a security device for the life of the facility. Due to the remote location of the facility with the closest residential structure over a half a mile away no additional screening or additional landscape being proposed for this application. 7. RECLAMATION PROCEDURES Upon termination of the proposed project, all equipment would be removed. The ground would be re- graded to accommodate agricultural uses or be re-vegetated to 80% of pre-disturbance vegetative cover in accordance with the COGCC 1000 Series Rules. The pre-disturbance vegetation cover shall be determined by the undisturbed surrounding area. We would also be willing to evaluate coordinating reclamation efforts with Weld County Extension, Public Works, and the Spoil Conservation District. Cannon Compressor Station T3N-R66W Sec 34 Weld County, Colorado 4 8. STORM WATER DRAINAGE A water quality feature has been added. A drainage narrative will also be submitted and will provide additional details. 9. CONSTRUCTION PERIOD Construction of the proposed facility is expected to commence shortly after the site plan and Use by Special Review application are approved. We expect construction to be complete by the end of 2015. 10. STORAGE & STOCKPILING OF WASTES / WASTE HANDLING PLAN The following wastes are expected to be generated on site from the operations and maintenance of equipment. Typically these are used as coolants and lubricants and need to be changed on a regular basis. Product Name Quantity Used Triethylene Glycol (TEG) 25 gal Used Cat NGEC Premix 50/50 25 gal Used Mobil Pegasus 805/Oily Water 100 gal The wastes listed above are generated on a monthly basis and either recycled or disposed of by Mesa Oil. The replacement products needed as part of this equipment maintenance will be stored in steel tanks mounted on steel skid mounted containment units. The seams will be sealed. Each unit will be sufficient to contain 1 .5 times the tank capacity. Additionally, oil and coolant are also stored within the compressor units themselves and spills are contained by the structural steel skid of the actual compressor. A list of associated SDS sheets are attached in the appendix of this application. The waste generated from the municipal waste dumpster, roll-off, and portable sanitation unit (portable toilet) are managed and disposed of by Waste Management. The portable toilet is emptied weekly, and the dumpster either weekly or biweekly. The roll-off is emptied on a call-out basis. Waste Handling/Recycling Contact Information: Mesa Oil, Waste Management 7239 Bradburn Blvd. 2400 West Union Ave Westminster, CO 80030 Englewood, CO 80010 (303) 426-4777 (303) 482-6406 In the unlikely event of a motor vehicle oil leak (potentially during construction), KMGG will take appropriate measures to mitigate the effects of the spill/release. If a spill/release meets or exceeds any regulatory reporting criteria, KMGG will report the spill to the appropriate regulatory agency(s). KMGG's standard operating procedures are to excavate the impacted soils and transport them to a licensed disposal facility. As appropriate, confirmation soil samples will be collected from the excavation for laboratory analysis. Laboratory analytical results will be utilized to demonstrate effective remediation to below the appropriate regulatory standards. The laboratory reports will be included in any written report to a regulatory agency. Following completion of the excavating activities, the area will be backfilled and returned to its pre-release grade. Please see Appendix for all Safety Data Sheets (SDS) of wastes generated. No vehicles be washed on site. Additionally, All KMGG/APC and contractor activities will be operated in a manner that prevents spills and releases of crude oil, natural gas, produced water and other wastes to the environment. Non-routine waste (e.g. spills or releases) will be managed in accordance with KMGG/APC's Emergency Response and Oil Spill Contingency Plan. Spills, as appropriate, will be reported to the proper regulatory agency(s). Additionally, a site-specific Spill Prevention Control and Countermeasure (SPCC) Plan will Cannon Compressor Station T3N-R66W Sec 34 Weld County, Colorado 5 be developed to outline appropriate actions to be taken in the event of a spill or release. The SPCC Plan, in conjunction with the Emergency Response and Oil Spill Contingency Plan, will ensure that all appropriate response actions are taken and that all waste will be handled in accordance with applicable rules and regulations. Both documents are written in accordance with requirements set forth by the Environmental Protection Agency. A copy of this plan will be submitted to Weld County within six months after start of operations. 11 . LIST ALL ON-SITE AND OFF-SITE IMPROVEMENTS AND TIMELINE A list of all the equipment is shown on Sheet 3 of the USR Site Plan drawing package, along with the proposed phase of construction. Other improvements are as follows: Site grading and drainage: Phase 1 Access Road construction: Phase 1 Fencing: Phase 3 Landscaping: Not applicable Phase one: 2015 Phase two: 2016 Phase three: 2017 Note: this phasing schedule is an estimate and may fluctuate depending on economic conditions, part availability, weather conditions, and well production. Cannon Compressor Station T3N-R66W Sec 34 Weld County, Colorado 6 SECTION 2 1 . NOTIFICATION REQUIREMENTS In accordance with Section 23-2-260 (B) (9) of the Weld County Code a certified list of the names and addresses of the owners of property within 500 feet of the subject property (Parcel # 121134000008) is listed below and provided in the Appendix. The County is responsible for mailing the notice. This list was created from Assessor records of Weld County on November 17, 2014. A signed version is available in the appendix of this application. Account Parcel Owner Mailing Address R4931786 121134000020 ADAMS LORRAINE 15464 COUNTY RD 28 PLATTEVILLE CO 806518122 R4931486 121134000008 ANADARKO 1099 18TH ST STE 1800 E &P DENVER CO 802021918 R6777242 121134300002 ANADARKO E&P ATTN TRAVIS HOLLAND- COMPANY PROPERTY TAX LP PO BOX 173779 ivEwef1807171779 R4931586 121134000009 BARCLAY FARMS 13017 COUNTY ROAD 30 LLC PLATTEVILLE CO 806518111 R4932486 121135000003 CANNON LAND CO 3575 E CHERRY CREEK NORTH DR DENVER R5158586 130902000001 CANNON LAND CO 3575 E CHERRY CREEK NORTH DR DENVER R5159386 130903000007 CANNON LAND CO 3575 E CHERRY CREEK NORTH DR DENVER R6777238 121134300001 MAYER REVOCABLE 810 PROCLAMATION DR TRUST TAMPA FL 336133139 R4932186 121135000002 NILES MILLER C/O DIANNE KAY BROWN FAMILY MANAGER 1913 GOLDENVUE FARMS LLC DR 2. OPERATION STANDARDS a. Noise Control The operation of the Compressor Station shall comply with the noise standards enumerated in Section 802 of the COGCC Amended Rules 2008. Noise is emitted from compressor sites, however, the daily maintenance performed by sub- contractor or Anadarko employee will be done by pick-up truck and trailer and typically during normal business hours. The rural setting of the project location is preferred to mitigate the effects of noise emissions on the surrounding property owners. Please see appendix for a copy of the Noise Abatement Plan. b. Air and Water Quality All activities will be in compliance with the permit and control provisions of the Colorado Air Quality Control Program, Title 25, Article 7, C.R.S. as applicable. No waste water will be discharged within the site. All water and waste is carried by vehicle off the site. Cannon Compressor Station T3N-R66W Sec 34 Weld County, Colorado 8 c. Lighting All lighting on the site will be downcast and shielded. Lighting will be provided for security, evening maintenance, and emergency work. Any source of lighting on the site shall be shielded so that light will not shine directly onto adjacent properties. Nor will direct or reflected light from any source on the project site create a traffic hazard to operators of motor vehicles on the adjacent road access. There will be lights at the compression pipe racks and be duplex fixtures on one pole facing opposite directions. Each compressor will also have a door light and a wall mounted light at the end of each cooler. In additional all office, motor control center, power distribution center, and compressor buildings will have a wall mounted light at each door. Please see Appendix for a reasonable facsimile of lights selected for the site. d. Weed Control The compressor site will be kept free of weeds, rubbish, and other waste material. The area will be treated if necessary and as practicable to prevent invasion of undesirable species and noxious weeks. 3. REQUIRED PERMITS a. Weld County A Use by Special Review Permit is required to be approved by the Weld County Board of County Commissioners prior to construction, including release of grading permits for this facility. KMGG/APC will submit any additional permits necessary for county approval prior to commencement of construction site. b. Platteville — Gilcrest Fire Protection District The Site Plan and Special Review Use Application will be referred to and reviewed by the Platteville — Gilcrest Fire Protection District. Approval of the plans is expected. Any requested Safety Data sheets (SDS) will also be provided to the Platteville — Gilcrest Fire Protection District. c. Transport Permits A Transport Permit for oversize load and/or overweight vehicles will be obtained through Public Works prior to construction. d. Grading Permit A grading permit is needed for disturbing an area of 1 acre or more. A grading plan will be submitted for review and approved by Public Works prior to construction. e. Access Permit The access point for the facility is located off of Weld County Road 33. This entry point already exists and meets all of KMGG/APC's access requirements. A new access permit will be submitted. A copy of the approved access permit will be provided to Weld County and number added to the USR drawings. f. Right-of-Way (ROW) Use Permit A Right-of-Way Use Permit if necessary will be obtained through Weld County in the event any work is performed in the public right-of-way. Cannon Compressor Station T3N-R66W Sec 34 Weld County, Colorado 9 g. Construction Storm Permit A Construction Stormwater Permit is needed for disturbing more than 1 acres. This permit will be obtained from the State Colorado Department of Public Health and Environment, Water Quality Control Division. 4. TRAFFIC The construction process will involve site grading with equipment, including but not limited to, motor graders, front end loaders, excavation equipment, and possibly scrapers. Heavy hauls involving the compressor units and some of the larger process equipment will be necessary, as will the use of large truck mounted cranes to unload and set this equipment. The length of the heavy haul trailers will determine the required access to the site off the county roads, although typically this has been an apron off the county road of about 75 to 100 feet necking down to a fenced and or gated opening of around 40 feet. This would depend on the available turning radius off the county road. There will also be concrete trucks and pumpers on a regular basis during construction. Anticipated staffing during the construction of the facility is estimated at 30 to 40 personnel during peak construction, 3 to 4 office trailers and 5 to 8 tool and parts vans/conex buildings. Please see Use by Special Review Questionnaire for traffic detail post construction. 5. DUST ABATEMENT PLAN During the construction phase of the project, KMGG, will use or contract to have water trucks utilized to maintain dust suppression and fugitive particulate emissions. Also, the Storm Water Management plan will be followed to mitigate soil erosion during construction. After completion of construction, the property will be stabilized using appropriate native vegetation, usually a combination of dryland/grass mixture or crop, which will not be allowed to grow over 12" high. Additionally KMGG will gravel any access and driving surfaces affected, with the same material in its existing condition. If necessary, KMGG will also use or contract to control dust after construction. 6. FIRE AND EMERGENCY RESPONSE There is adequate provision for the protection of the health, safety, and welfare of the inhabitants of the neighborhood and county. All roads leading to the site and within the site will be designated and maintained to support fire apparatus. A turnaround may be constructed as necessary to accommodate fire apparatus. In addition to above-referenced rules and regulations, KMGG/APC is also subject to COGCC Rule 6064 pertaining to fire prevention and protection. KMGG/APC has support personnel in the field or on call at all times to provide technical assistance in fire prevention and elimination. Cannon Compressor Station T3N-R66W Sec 34 Weld County, Colorado 10 III . NOISE ABATEM ENT PLAN Introduction The Cannon Compressor Station is a proposed Kerr-McGee Gathering, LLC (KMGG) facility located in Weld County. This facility is needed to help transport the increasing amounts of natural gas to processing facilities where it is then prepared for sale to market. KMGG has taken steps to attenuate noise originating from this site and will continue to take the necessary actions to comply with COGCC noise regulation. The following plan outlines how noise is mitigated at the Cannon Compressor Station site. Location and Surrounding Land Use The proposed Cannon Compressor Station access road is located approximately 760 feet north of the intersection of WCR 26 and WCR 33 in an area zoned for agriculture. Proposed I mprovements KMGG is proposing the installation eight (8) compressors. There will be six (6) CAT3606LE/Ariel JGK- 3, and two (2) 3750 HP Electric Units. There will also be one 60,000 gallon slug catcher, two (2) 30 MMscfd and one (1) 50 MMscfd coalescing filter separators, two (2) 30 MMscfd and one (1) 50 MMscfd TEG dehydrator-condenser-VRU's, one condensate pump skid and associated piping and electrical infrastructure. Noise Regulation and Goal There is no equipment presently at the proposed site. Under the current COGCC regulations, permissible noise levels cannot exceed 55 dBA during the day or 50 dBA at night. KMGG will ensure the installed equipment complies with these COGCC regulations. KMGG also has the ultimate goal of not exceeding 50 dBA at all times and will be measured at the fence line of the facility. Efforts to Date KMGG has already begun efforts to reduce noise on-site by designing High Specification Noise Suppression Packages (HSNSP) for the first three Cat3606LE/Ariel JGK-3 compressor/cooler packages. This includes a cooler silencer, a noise attenuated building over the engine and compressor, a combustion air intake silencer, and a hospital grade muffler on the engine exhaust. The other three proposed CAT3606LE/Ariel and two 3750 HP will be installed with the same cooler silencers and hospital grade mufflers on the engine exhaust or lower noise emitting coolers. Assessment and Attenuation Upon operation KMGG will conduct a noise survey to determine if noise levels meet COGCC requirements. If noise exceeds levels then sound walls or insulation will be built around the identified problem equipment. Ventilation packages may also need to be installed to ensure that the equipment is able to operate while being completely enclosed. Cannon Compressor Station T3N-R66W Sec 34 Weld County, Colorado 14 XI . AIR POLLUTANT EMISSION NOTICE (APEN) Kerr-McGee Gathering LLC (KMG) registered three compressor engines under General Permit Number 2 ("GP02"), issued by the Colorado Department of Health and Environment. KMG also submitted an Air Pollutant Emission Notice (APEN) for a backup emergency generator. With the submittal of these documents to the CDPHE, KMG has the permit coverage necessary to construct and operate the Cannon Compressor Station. The CDPHE will acknowledge the permit coverage with the issuance of a letter to KMG, which KMG can provide immediately upon receipt. Cannon Compressor Station T3N-R66W Sec 34 Weld County, Colorado 23 VI . EMERGENCY INFORMATION SHEET 1 . General Information: The purpose of this document is to provide ownership information case of emergency. It may be used by outside agencies, company employees, and contract labor to help secure a speedy recovery from such emergency situations: a. Name and Address: Kerr-McGee Gathering, LLC 1099 18th St, Suite 1800 Denver, CO 80202 b. Type of Facility: Compressor Station c. Location and Access: Part of the southeast quarter of section 34, Township 3 North, Range 66 West. 6th P.M. All proper warning signs and equipment guards will be installed. 2. Emergency Contact List: The following is a list of KMGG/APC personnel and organizations that may be contacted in the event an emergency occurs at the facility. Due to the nature of this being a midstream facility, any emergency will necessitate KMGG personnel to respond to the issue and resolve with our standard company protocol. KMGG has trained personnel available 24/7 to respond to incidents and engage local officials as appropriate. KMGG/APC's Integrated Operations Center (IOC) provides 24 hours a day/7 days a week monitoring and emergency response that number is 1 -866-504-8184. In any case the following personnel at APC can be reached if necessary: KMGG and APC - Emergency Contact List: Contact Phone Number Notes Anadarko and Kerr-McGee (970) 339-1020 24/7 Emergency Response Integrated Operating Center (IOC) (866) 504-8184 Number Scott Rovira, (720) 929-6243 - o Drilling and completion Drilling General Manager (281) 702-0652 - m operations. Shane Fross -General Manager — Rockies (720)929-7226 - o Drilling and completion Completions (307)680-8670 - m operations. (720) 929-6246 - o Production and Midstream Rex Specht -Regional Operations (303) 241-3582 - m Operations Director Michael Lutkin (970) 515-1266 - o Production Superintendent (970) 397-0431 - m Gathering and compression operations Randy Lavalleur (303) 655-5376 - o Production Superintendent (303) 815-8247 - m Plant operations Charles Chase, (970) 515-1176 - o Sr. HSE Representative (307) 399-3911 - m Midstream operations. Rick Morrish (970) 515-1157 - o Staff HSE Representative (303) 570-4745 — m Midstream operations. Patrice Barnett (303) 655-5310 - o HSE Representative II (720) 325-3429 - m Jeff Jones (970) 506-5925 - o Drilling, completion, and production Sr Staff HSE Representative (307) 262-2899 -m operations. Cannon Compressor Station T3N-R66W Sec 34 Weld County, Colorado 17 Midstream Emergency Response Contact List: Phone Incident Contact Comments Number Fire, explosion, Platteville-Gilcrest Fire 911 or serious injury Protection District (970) 785-2232 Weld County Sherriff's 911 or Office (970) 356-4015 COGCC (303) 894-2100 Reporting required for spills of crude oil, produced water, or E&P waste Spill or release COGCC (303) 894-2100 exceeding 5 bbl in containment or 1 bbl outside of containment, or all spills that impact surface or ground water Platteville-Gilcrest Fire 911 or Reporting required for spills impacting Protection District (970) 785-2232 surface water or for reportable quantity spills of CERCLA hazardous substances. Colorado Department Reporting required for spills impacting of Public Health and (800) 886-7689 surface water or for reportable quantity Environment spills of CERCLA hazardous substances. Reporting required for spills impacting US EPA (800) 227-8917 surface water or for reportable quantity spills of CERCLA hazardous substances. National Response (800) 424-8802 Reporting required for spills impacting Center surface water or for reportable quantity spills of CERCLA hazardous substances. A commercial spill clean-up and Clean Harbors (406) 370-6595 response contractor Cannon Compressor Station T3N-R66W Sec 34 Weld County, Colorado 18 2 PFIZEUMNPCRIAMCN allEra Rip:ea g MEI Intendedlse Frith erpanorta Bectrical addaaewithccgucloy, Fntend ngaee� dred polyester porvcia firidl. AI baladsae100%fa ay ridgy plaledseav Mel l lilting,wdkwaysald /kilt ioneladlitedLira tested. Hghrex1awfigh d1..imlteraaltat. 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Inca xf312a/,2/N,347. 18 Re#1xvYithfixtuerareaxda(eg,1(PD/1Q. 534 L/THONIA LIGHT/NS 1-800-279-8041 I wwwlithaiac n F 0 Light ing Roadway & Security Fixtures I Roadway and Security Fixtures ,c0.2 GE L/77-10/V/A . ____ 2 OW Lighting Solutions I� L/GNT//NG lall i • Lamps not included, except Nbs. 18N219, SECu Fa t y Lighting 18N220, 1 FLJ3, and Contour® Area Lighting • Include cast-in external slipfitter for Durable, lightweight, die-cast aluminum fixtures bolt easy mast arm installation securely onto mast arm mounting. • De-cast aluminum head meets gE Light ing SoLut ionS Roadway NENIAdimension standards N 21 7 • Mogul-base socket is. P� and 2LBL8 h r have a small profile for use in ` • Rug-in ignitor for easy maintenance commercial applications. No. 1FLJ3 includes lamp aid Area/Roadway • Bolt to 112" to 2" dia. mast arm mounting photocell; mounts directly to a 4" "J" box. Nis. 21 DT aid 44%479 feature lightweight aluminum housing, An adjustable photocell controls HD(high intensity discharge) light sources. F�lye�er gasket locks out prismatic refractor, and a 5" mounting arm. Nis. dust and dirt. Gay powder-coated finish. R�atocell 21 W 6 and 2l RL5 have a powder-coated housing, or shorting cap required sold separately on page high-impact diffuser, and protective steel cage. fib. dirlie 5YB41 induces 18" mast arm, lamp, photocontrd, 451 . Nbs. 18N219 and 18N220 include integral surge hardware. Nb. 5YB'!'1 features a coder-running protection. ballast, 392°F wiring, and phosphor bronze contacts. Area/Roadway Full aitoff optics, nos. 4wy41 , LL Listed. 4wy40, and 4wy45 Cont ouF True 90° cutoff (no light above 90°) meets IESf'A Horizontt a Lighting al porcelain mogul socket full cutoff classification FF8-2000. Nbs. 4VW41 and • Include extruded 4" arm for square pole mounting 4WY40 have easy-to-doan, corrosion-freeALCLAS'' Pill: reflector surface coating. Fixtures have a dark bronze corrosion-resistant polyester finish and soft corners. Lie-cast alumi- Frismati c Lens. nos. 4wy42 to num fixtures have soft corners and a dark bronze. 4wy44, 18n219, and 18n220 H'droformed aluminum reflector and multitap ballast. R-oject light farther; use fewer poles on new installa- IFo5 Fated. U.. Listed for wet locations. tions to save on operating costs. Mount ingBRaCkEtS and aO SSoRiES __-_,-e- a REa/Roadway as brackets for pole or wall mounting have 42-lb. _ Ifi• otocontrol receptacle adjusts without tools capacity hb. 4EA34. has 87-lb. capacity. Security • Bolt to 114"-dia. mast arm mounting Lighting k SquaRE Mount ing FoLES r Built-in wildlife shield adjusts to fit most arms. 1-bat- 1. ' +?k - • resistant gasket seals the optical chanter from F�quire proper evaluation to ensure structural integrity J. envi rani rierltal contaminants. Terminal block standard. in specific local wind conditions. 1-pc., square straight 1 Nbs. 511345 to 5YB47 are pre-wired and indude hard lighting pdes have a 4" dia. shaft and anchor ham ware. � � with slotted holesst . . Hot-rolled, 11-ga. steel construc- tion. Dark brorizepowder-coated finish. contour Area Lighting Nbte: Fa a wider seledicn of lighting poles and for assistance in pole selection, please call your local branch. Suggested Suggested Lamp Light Photocell Lamp Item $ Lamp Type Voltage Watts Lens Type Distribution Item No. L W H Item No. &and Mfr. Series No. Eadi Area/Fbadway HPS 120 100 Drop Acrylic Type II 6F006 10" 13" 27" 2V519 Lithonia 115 5YB45 `✓ 140.30 HPS 120 150 Rat Gass Type III 5U793 53'a" 13Y4" 26Y4" 2VAD7 GE Lighting M2RC 4WY41 ✓ 307.00 HPS 120 150 Crop Acrylic Type II 5U793 103/2" 13Y4" 26Ye 2VAD7 G=Lighting M2RR 4WY43 ✓ 302.75 HPS 120 150 Crop Acrylic Type II 6P006 10" 13" 27" 2VAD7 Lithonia 115 5YB46 " ✓ 149.35 HPS 120-277 250 Rat Gass Type Ill _ 5U793 53'4" 13Y4" 26Y4" 3APT5 G-Lighting M2RC 4WY40 325.25 HPS 120-277 250 Drop Gass Type III 5U793 10Y2" 13Y4" 26Y4" 3APT5 GE Lighting M2RR 4WY42 333.25 HPS 120-277 250 Drop Gass Type III 5U792 10" 13" 27" 3APT5 Lithonia 115 5YB47 *✓ 229.25 HPS 120-277 400 Rat Gass Type I l 5U793 SW' 15Y4" 313'x" 3APT6 CE Lighting msa 4WY45 ✓ 520.50 HPS 120-277 400 Prismatic Drop Gass Type III 5U793 14Ye 15" 313'4" 3APT6 CT Lighting MSRL 4WY44 503.50 PMH-EE 120-277 400 Prismatic Gass Len M-GI II 5U793 3113'16' 15Ys" 14%16' 3APK4 G=Lighting MSCL 18N219 671.50 PMH-EE 120-277 400 Prismatic Gass Len M-Gl II 5U793 3113'16" 15Ys" 14%16" 3APK4 G=Lighting MSC_ 18N220 562.00 MH 120-277 400 Tempered Gass Type Ill — 33" 25" 8Y4" 6XV25 Lithonia MR2 3JXC9 ✓ 1,028.00 MH 120-277 400 Tempered Gass Type IV — 33" 25" 8Yi" 3APK3 Lithonia MR2 3JXD1 1,090.00 Security Lighting MH 120 50 Acrylic Type V — 9Ye 8Y4" 10Y2" 1F398 LumaPro — 2LBL7 / 255.75 HPS 120 70 Polycarbonate Type V — 10Xe 8Y 73'4" 2V632 Lithonia G LD 1 PLJ3 1 87.05 MH 120 70 Acrylic Type V 6P006 12W 9Yi' 16W' 2F942 LumaPro — 2HER6 1 159.00 HPS 120 70 Acrylic Type V — 93'4" 814" 10Y2" 2YC6 LumaPro — 2LBL8 ✓ 163.00 HPS 120 70 Acrylic Type V 6F006 15Y2" 12" 17' 2YCF6 LumaPro — 4VM79 / 184.50 MH 120 100 Polystyrene Type V 6P006 15W 13" 17" — LumaPro — 21 PJ 6 ✓ 314.75 MH 120 100 -- Type V 6P006 15Y2" 13" 17" 2YGC6 Lithonia TDD 6J6N7 ✓ 191.50 HPS 120 150 Polystyrene Type V 6F006 15W 13" 17" 2YC 1 LumaPro — 21 R 5 ✓ 239.50 HPS 120 150 Acrylic Type V 6P006 15W 13" 17" 2V713 Lithonia TDD 6JBVI8 ✓ 155.00 Contour" Area Lighting MH 120-277 250 Tempered Gass Type III — 17W 17W 7Ys" 3APK1 Lithonia KAD 3JXC5 1 720.00 I'S Li 401 Tempered Gass Type III 7Ya" _6X125___ Lithonia_ 2., / 800.50 400 Tempered Gass Type IV 6XV25 Lithonia_ ✓ 800.50 �curity/Area Lighting HPS 120 100 Acrylic TypeV — 15Y2" 12" 12" 2VAD5 Lithonia 11L 5YB41 ✓ 95.90 Hr'S 120 100 Acrylic TypeV 6P006 15W 12' 17' 2V519 Lithonia 11 5YB44 110.50 L W H Mfr. Item $ Mfr. Item $ Description (in.) (in.) (in.) Brand Model No. Each L W Brand Model No. Each Mounting Brackets and Accessories . :J: IEs 4 2 5 Lithonia WBE04 4EA33 73.80 16 ft. 4" Lithonia SSS 16 4C DM28 5YB49 687.50 Fble Slipfitter Bracket Mount 14Y4 2%s 2%s Lithonia T20-190 4E434 125.95 PL DDB SHAFT ;se with KAD Seri e_ 4 2 5 Lithonia RPD04 U 4EA35 57.05 SSS 20 4C DM28 • Photocell Receptacle Shorting Cap — — — CB Lighting Sal-PCCTL003 4WY49 11.53 20 ft. 4" Lithonia PL DDB SHAFT 5YB50 727.00 * Photo cel I receptacle. 25 ft. 4" Lithonia SSS 25 4C DM28 5YB51 940.50 PL DDB SHAFT 1 For Photocells, see page 451 . 712 GRAINGER® Find even MORE on Grainger.com® 1= Repair & Replacement Coverage Available "It ANADARKO (970) 339-1020 OR (303) 659-5922 Authorized Personnel Only Solo Personal Autorizado No Smoking Beyond this Point No Fumar Partir De Este Punto Wear Protective Equipment Use Equipo de Proteccion CANNON COMPRESSOR STATION PART OF THE SW QUARTER OF SECTION 34 TOWNSHIP 3 NORTH, RANGE 66 WEST DANGER: HIGH IN CASE OF MEDICAL PRESSURE GAS EMERGENCY CALL 911 krii Kerr!vtGee CANNON COMPRESSOR STATION PART OF THE SW QUARTER OF SECTION 35 SECTION 34 -T3N-R66W SITE SPECIFIC DEVELOPMENT PLAN AND USE BY SPECIAL REVIEW (USR) APPLICATION FOR PLANNING DEPARTMENT USE DATE RECEIVED: Revised 3/19/15 RECEIPT#/AMOUNT# /$2500.00 CASE#ASSIGNED: USR14-0079 APPLICATION RECEIVED BY DA PLANNER ASSIGNED: DA Parcel Number 1 2 1 1 _ 3 4 _ 0 _ 0 0 _ 0 0 8 (12 digit number-found on Tax I.D.information,obtainable at the Weld County Assessor's Office,or www.co.weld.co.us) Legal Description 16681 SE1/4 34-3-66(4R6D) 15725 26CR , Section 34 , Township 3 North, Range 66 West Zone District:Agriculture , Total Acreage: 150 Acres , Flood Plain: NO , Geological Hazard: No , Airport Overlay District: No FEE OWNER(S) OF THE PROPERTY: Name:ANADARKO E&P COMPANY LP Work Phone# 720-929-6160 Home Phone# Email tracy.colling@anadarko.com Address: 1099 18th Street, Suite 1800 Address: City/State/Zip Code Denver, CO 80202 Name: Work Phone# Home Phone# Email Address: Address: City/State/Zip Code Name: Work Phone# Home Phone# Email Address: Address: City/State/Zip Code APPLICANT OR AUTHORIZED AGENT (See Below:Authorization must accompany applications signed by Authorized Agent) Name:Tracy Coiling-Kerr McGee Gathering, LLC Work Phone# 720-929-6160 Home Phone# Email tracy.colling@anadarko.com Address: 1099 18th Street, Suite 1800 Address: City/State/Zip Code Denver, CO 80202 PROPOSED USE: Natural gas compressor station to assist in the transport of products to processing facilities and laydown yard to store items related to oil and gas exploration and development. I (We) hereby depose and state under penalties of perjury that all statements, proposals, and/or plans submitted with or contained within the application are true and correct to the best of my (our)knowledge. Signatures of all fee owners of property must sign this application. If an Authorized Agent signs, a letter of authorization from all fee owners must be included with the application. If a corporation is the fee owner, notarized evidence must be included indicating th the signatory has to legal authority to sign for the corporation. cat.i (L. fb Sig ature: O n or Authorized Age t Da Signature: Owner or Authorized Agent Date SECTION 1 1. DESCRIPTION OF PROPOSED USE: This USR application is referred to as the Cannon Compressor Station and Laydown Yard application and is submitted by Kerr-McGee Gathering,LLC (KMGG),a subsidiary of Anadarko Petroleum Corporation (APC). APC and KMGG operate nearly 5,000 oil and gas wells in the Denver-Julesburg(DJ)Basin with the vast majority being located in Weld County, Colorado. All of these wells produce varying amounts of natural gas that need to be routed via a system of underground pipelines through a number of compressor stations in Weld County. This proposed site is located on parcel 1211340008 and is owned by Anadarko E&P Company,LP. The site is located less than one 1/2 mile northwest of the intersection of Weld County Road 26 and Weld County Road 33. It is currently zoned Agriculture and surrounded by parcels that are also zoned Agriculture. The use is currently undeveloped rangeland with several natural gas well heads with associated small condensate tanks. Two uses are proposed on this parcel,a compressor station and a laydown yard. A compressor station helps the transportation process of natural gas from one location to another.Natural gas,while being transported through a pipeline,needs to be constantly pressurized in certain distance intervals(from 4 up to 100 miles). The gas in the compressor station is pressurized by special turbines,motors and engines. The proposed compressor station will be leased by KMGG. The second proposed use is a laydown yard, providing storage for various oil and gas support services equipment. Proposed Cannon +� Compressor Station . prox.9 Acres I1 � tl II Parcel 12113.1000008 • I _ I 4J Laydown Yard Approx.17 Acres .° Access Load Caunty.Raada26. • Coon 'oad 26 Exhibit A—Vicinity Map Cannon Compressor Station&Laydown Yard T3N-R66W Sec 34 Weld County, Colorado 2 Compressor Station: The proposed operation outlined in this application,includes various compression equipment that will be used to compress and transport natural gas. The equipment being proposed will include compressors, vapor recovery units, separators,dehydrators,launchers, coalescers, storage tanks and additional supporting compression equipment. There will also be an electric switch yard consisting of a transformer to step down the incoming distribution voltage from 69 kV to 12.7 kV. The switch yard is included within the compressor station's fence area for safety and to reduce the total footprint. This allows the burial of the low voltage lines into the station instead running the larger power lines overhead across the parcel into the station. A communications tower is also proposed,to allow the site to be operated remotely. The communications tower will be a 70 foot tall tower and powered from the Compressor Station UPS. There will be 1-2 dishes on the tower and it will handle all communications on site,and co-location will be possible. Please see the Site Plan in the Appendix for a more detailed layout and description of the proposed equipment and a reasonable facsimile of the communications tower. The compressors on site operate 24 hours a day, 7 days a week, 365 days a year. However, the station will automatically adjust to run only those engine-compressors needed to adequately handle the volume of gas flowing through the pipeline. Facility Ownership: Cannon Compressor Station Kerr-McGee Gathering, LLC 1099 18th St., Suite 1800 Denver, CO 80202 Laydown Yard: The proposed laydown yard included in this application will be located on the same parcel,with a separate access point than the compressor station, see the Vicinity Map,Exhibit A. The laydown yard will be approximately 17 acres in size,with two of those acres chain-link fenced to store smaller items. The yard will store items related to oil and gas support and service. This includes,but not limited to the following items: parts for drilling rigs,drilling iron pipe and fittings,poly pipe and fittings,two parts trailers and rig mats. There will be no chemicals stored on this site. 2. CONSISTENCY WITH THE INTENT OF THE WELD COUNTY CODE, CHAPTER 22 OF THE COMPREHENSIVE PLAN The proposed use is consistent with Chapter 22 and any other applicable code provisions or ordinance in effect. Section 22-2-10(D)emphasizes the "Extraction of natural resources as an important part of the economy of Weld County. Such extraction operations should minimize the impacts on agricultural lands and agricultural operations."This compressor station and laydown yard will contribute to the expansion of the County's economic base by providing increased capacity for future oil production. The proposed addition of a compressor station and laydown yard in this location conserves land by eliminating the need for these facilities elsewhere in Weld County. Section 22-5-100.A(OG. Goal 1) states: "Promote the reasonable and orderly exploration and development of oil and gas mineral resources,"while Section 22-5-100.B (OG. Goal 2) strive to, `Ensure that the extraction of oil and gas resources conserves the land and minimizes the impact on Cannon Compressor Station&Laydown Yard T3N-R66W Sec 34 Weld County, Colorado 3 surrounding land and the existing surrounding land uses." Section 22-5-100.B, (OG. Policy 2.9) outlines the objective to, "Impose protective measures through available state, County and federal regulations to ensure that the mineral operator conducts operations in a manner that will minimize current and future environmental impacts."The Use by Special Review application for a Mineral Resource Development Facility,which is part of a comprehensive gas processing network necessary to move larger volumes of gas,due to increases in drilling activity and projected additional production increases anticipated by producers in the Weld County area. 3. CONSISTENCY WITH THE INTENT OF THE WELD COUNTY CODE, CHAPTER 23 (ZONING)AND THE ZONE DISTRICT IN WHICH IT IS LOCATED. Oil and gas facilities are allowed as a use by right in the A(Agricultural)Zone District.However,oil and gas support and service operations such as a Compressor Facility and Laydown Yard require the approval of a Use by Special Review Permit. The proposed use is consistent with the intent of the A(Agricultural) Zone District. Section 23-3-40.A.2 of the Weld County Code provides for Oil and Gas Support and Service, and Section 23-3-40.L of the Weld County Code provides for a communications tower greater than 70 feet in height as a Use by Special Review in the A(Agricultural)Zone District. 4. SURROUNDING USES AND COMPATIBILITY WITH SURROUNDING USES. There are currently no USR permits on the proposed site. The proposed facility does not interfere with the existing use of the area,and remains compatible with the current zoning. 5. DETAILS OF THE SITE a. Number of people who will use this site There are no permanent employees on this site. The site is visited by a KMGG/APC employee on a daily basis.The employee is typically not on site for longer than one to two hours at a time. Given the short amount of time an employee is on site,permanent water and sewer service is not necessary. The site is monitored 24 hours a day 7 days a week by the computers at the company's gas control centers in Brighton and Denver. Bottled water and a port-a-let will be utilized by personnel visiting the facility and the laydown yard. b. Number of employees proposed to be employed at this site There will be no full time employees at the Cannon Compressor Station or the Cannon Laydown Yard. One employee may visit the site on a daily basis. c. Hours of operation The compressors on site run 24 hours a day 7 days a week based on demand. On average one employee will visit the site once each day in a pick-up truck. Trucks will generally only come to the site during the hours of 8 am to 5 pm unless there is an emergency. The Laydown Yard will be access primarily during daylight hours,however it should be available 24 hours a day 7 days a week on demand. d. Type and number of structures to be built on this site Please see the Site Plan in the Appendix for a more detailed layout of all proposed buildings and communication tower and laydown yard. e. Type and number of animals There are no animals on site. Cannon Compressor Station&Laydown Yard T3N-R66W Sec 34 Weld County, Colorado 4 f Kind of vehicles that will access this site and how often A KMGG/APC employee will visit the site once each day in a pick-up truck. Larger vehicles with trailers may come to the site for delivery,repair,and maintenance purposes only,on a periodic basis. g. Fire Protection The Platteville-Gilcrest Fire Protection District provides fire protection to this area. A referral packet will be sent to the District by the County. h. Water source on the property There are no full time employees on site.A KMG/KMGG/APC employee will visit the site on a daily basis. Due to the lack of employees permanently on site,a water connection is not necessary. Should the status of employees on site change,water would be requested from Central Weld County Water District or obtained from a new well on site as appropriate. Bottled water will be available during construction and during operation. i. Sewage disposal system There is no need for a sewer disposal system. Employees will have access to use a port-o-let. This facility will be serviced by Waste Management for waste removal. A small dumpster will also be on site for the disposal of household waste. Should a water source later be required, there appears to be ample space on the lot to provide for an ISDS for sewage disposal. j. Storage or warehousing No additional storage or warehousing is proposed for this facility. 6. PROPOSED LANDSCAPING It is anticipated that the compressor facility will be enclosed with a chain-link fence approximately 6 to 7 feet high with a potential 3 foot outrigger and barbed wire to prohibit vandalism and theft not only during the construction phase but also as a security device for the life of the facility. The storage yard will not be fenced,with the exception of a two-acre area for smaller storage items. This will be a 6-7 foot tall chain- link fence,with a locked gate. Due to the remote location of this site,with the closest residential structure over a half a mile away no additional screening or landscaping is proposed for this application. 7. RECLAMATION PROCEDURES Upon termination of the proposed project, all equipment would be removed. The ground would be re- graded to accommodate agricultural uses or be re-vegetated to 80%of pre-disturbance vegetative cover in accordance with the COGCC 1000 Series Rules. The pre-disturbance vegetation cover shall be determined by the undisturbed surrounding area. KMGG would also be willing to evaluate coordinating reclamation efforts with Weld County Extension,Public Works, and the Soil Conservation District. 8. STORM WATER DRAINAGE A water quality feature has been added. A drainage narrative will also be submitted and will provide additional details. 9. CONSTRUCTION PERIOD Construction of the proposed facility is expected to commence shortly after the site plan and Use by Special Review application are approved. We expect construction to be complete by the end of 2015. Cannon Compressor Station&Laydown Yard T3N-R66W Sec 34 Weld County, Colorado 5 10. STORAGE&STOCKPILING OF WASTES/WASTE HANDLING PLAN The following wastes are expected to be generated on site from the operations and maintenance of compressor station related equipment. Typically these are used as coolants and lubricants and need to be changed on a regular basis. Product Name Quantity Used Triethylene Glycol(TEG) 25 gal Used Cat NGEC Premix 50/50 25 gal Used Mobil Pegasus 805/Oily Water 100 gal The wastes listed above are generated on a monthly basis and either recycled or disposed of by Mesa Oil. The replacement products needed as part of this equipment maintenance will be stored in steel tanks mounted on steel skid mounted containment units. The seams will be sealed. Each unit will be sufficient to contain 1.5 times the tank capacity. Additionally, oil and coolant are also stored within the compressor units themselves and spills are contained by the structural steel skid of the actual compressor. A list of associated SDS sheets are attached in the appendix of this application. No Chemical will be stored at the laydown yard,nor will any vehicles be washed. The waste generated at the compressor station and the laydown yard from the portable toilets are emptied weekly, and the dumpsters either weekly or biweekly. The roll-off is emptied on a call-out basis. Waste Handling/Recycling Contact Information: Recycling Services: Waste Handling Services: Portable Toilet Services: Mesa Oil, Waste Management Redi Services 7239 Bradburn Blvd. 2400 West Union Ave 7601 Miller Drive#G Stallion Oilfield Services Westminster, CO 80030 Englewood,CO 80010 Frederick, CO 80504 2116 E Hwy.402 Unit B (303)426-4777 (303)482-6406 (720)378-7873 Loveland, CO 80537 Or (970) 646-3129 Reliable Services 1616 2nd Avenue Greeley, CO 80631 (970)381-1242 Or In the unlikely event of a motor vehicle oil leak(potentially during construction),KMGG will take appropriate measures to mitigate the effects of the spill/release. If a spill/release meets or exceeds any regulatory reporting criteria,KMGG will report the spill to the appropriate regulatory agency(s). KMGG's standard operating procedures are to excavate the impacted soils and transport them to a licensed disposal facility. As appropriate, confirmation soil samples will be collected from the excavation for laboratory analysis. Laboratory analytical results will be utilized to demonstrate effective remediation to below the appropriate regulatory standards. The laboratory reports will be included in any written report to a regulatory agency. Following completion of the excavating activities,the area will be backfilled and returned to its pre-release grade. Please see Appendix for all Safety Data Sheets(SDS)of wastes generated. No vehicles be washed on site. Additionally,All KMGG/APC and contractor activities will be operated in a manner that prevents spills and releases of crude oil,natural gas,produced water and other wastes to the environment. Non-routine waste(e.g. spills or releases)will be managed in accordance with KMGG/APC's Emergency Response and Oil Spill Contingency Plan. Spills,as appropriate,will be reported to the proper regulatory agency(s). Additionally, a site-specific Spill Prevention Control and Countermeasure(SPCC)Plan will Cannon Compressor Station&Laydown Yard T3N-R66W Sec 34 Weld County, Colorado 6 be developed to outline appropriate actions to be taken in the event of a spill or release. The SPCC Plan, in conjunction with the Emergency Response and Oil Spill Contingency Plan,will ensure that all appropriate response actions are taken and that all waste will be handled in accordance with applicable rules and regulations. Both documents are written in accordance with requirements set forth by the Environmental Protection Agency.A copy of this plan will be submitted to Weld County within six months after start of operations. 11. LIST ALL ON-SITE AND OFF-SITE IMPROVEMENTS AND TIMELINE A list of all the equipment is shown on Sheet 3 of the USR Site Plan drawing package,along with the proposed phase of construction. Other improvements are as follows: Compressor Station: Site grading and drainage: Phase 1 Access Road construction: Phase 1 Fencing:Phase 3 Landscaping:Not applicable Phase one: 2015 Phase two: 2016 Phase three: 2017 Note: this phasing schedule is an estimate and may fluctuate depending on economic conditions,part availability,weather conditions,and well production. Laydown Yard: Completed in February 2015 as part of an early release request to the Weld County Department of Planning Services. Cannon Compressor Station&Laydown Yard T3N-R66W Sec 34 Weld County, Colorado 7 SECTION 2 1. NOTIFICATION REQUIREMENTS In accordance with Section 23-2-260 (B)(9) of the Weld County Code a certified list of the names and addresses of the owners of property within 500 feet of the subject property(Parcel#121134000008) is listed below and provided in the Appendix. The County is responsible for mailing the notice. This list was created from Assessor records of Weld County on March 12,2015. A signed version is available in the appendix of this application. Account Parcel Owner _ Mailing Address R4931786 121134000020 ADAMS LORRAINE 15464 COUNTY RD 28 PLATTEVILLE CO 806518122 R4931486 121134000008 ANADARKO 1099 18TH ST STE 1800 E& P DENVER CO 802021918 R6777242 121134300002 ANADARKO E&P ATTN TRAVIS HOLLAND- COMPANY PROPERTY TAX LP PO BOX 173779 IIFNVFR ( fl Rf1717'77Q R4931586 121134000009 BARCLAY FARMS 13017 COUNTY ROAD 30 LLC PLATTEVILLE CO 806518111 R4932486 121135000003 CANNON LAND CO 3575 E CHERRY CREEK NORTH DR DENVER R5158586 130902000001 CANNON LAND CO 3575 E CHERRY CREEK NORTH DR DENVER R5159386 130903000007 CANNON LAND CO 3575 E CHERRY CREEK NORTH DR DENVER R6777238 121134300001 MAYER REVOCABLE 810 PROCLAMATION DR TRUST TAMPA FL 336133139 R4932186 121135000002 NILES MILLER C/O DIANNE KAY BROWN FAMILY MANAGER 1913 GOLDENVUE FARMS I LC DR 2. OPERATION STANDARDS a. Noise Control The operation of the Compressor Station and laydown yard shall comply with the noise standards enumerated in Section 802 of the COGCC Amended Rules 2008. Noise is emitted from compressor sites,however,the daily maintenance performed by sub- contractor or APC/KMGG employees will be done by pick-up truck and trailer and typically during normal business hours. The rural setting of the project location is preferred to mitigate the effects of noise emissions on the surrounding property owners. Please see appendix for a copy of the Noise Abatement Plan. b. Air and Water Quality All activities will be in compliance with the permit and control provisions of the Colorado Air Quality Control Program,Title 25,Article 7, C.R.S. as applicable. No waste water will be discharged within the site. All water and waste is carried by vehicle off the site. Cannon Compressor Station&Laydown Yard T3N-R66W Sec 34 Weld County, Colorado 9 c. Lighting All lighting on the compressor station site will be downcast and shielded. Lighting will be provided for security,evening maintenance,and emergency work. Any source of lighting on the site shall be shielded so that light will not shine directly onto adjacent properties. Nor will direct or reflected light from any source on the project site create a traffic hazard to operators of motor vehicles on the adjacent road access. There will be lights at the compression pipe racks and be duplex fixtures on one pole facing opposite directions. Each compressor will also have a door light and a wall mounted light at the end of each cooler. In additional all office, motor control center,power distribution center,and compressor buildings will have a wall mounted light at each door. Please see Appendix for a reasonable facsimile of lights selected for the site. Lighting will not be provided for the laydown yard. d. Weed Control The compressor site and laydown yard will be kept free of weeds,rubbish, and other waste material. The area will be treated if necessary and as practicable to prevent invasion of undesirable species and noxious weeks. 3. REQUIRED PERMITS a. Weld County A Use by Special Review Permit is required to be approved by the Weld County Board of County Commissioners prior to construction, including release of grading permits for this facility. KMGG/APC will submit any additional permits necessary for county approval prior to commencement of construction site. b. Platteville—Gilcrest Fire Protection District The Site Plan and Special Review Use Application will be referred to and reviewed by the Platteville—Gilcrest Fire Protection District. Approval of the plans is expected. Any requested Safety Data sheets(SDS)will also be provided to the Platteville—Gilcrest Fire Protection District. c. Transport Permits A Transport Permit for oversize load and/or overweight vehicles will be obtained through Public Works prior to construction. d. Grading Permit A grading permit is needed for disturbing an area of 1 acre or more. A grading plan will be submitted for review and approved by Public Works prior to construction. e. Access Permit The access point for the compressor station facility is located off of Weld County Road 33. This entry point already exists and meets all of KMGG/APC's access requirements. A new access permit has been approved and copy is included in the Appendix. The access for the laydown yard is located off of Weld County Road 26. This entry point already exists and meets all KMG/APC's access requirements. A new access permit has been approved and a copy is included in the Appendix. Cannon Compressor Station&Laydown Yard T3N-R66W Sec 34 Weld County, Colorado 10 f Right-of-Way(ROW) Use Permit A Right-of-Way Use Permit if necessary will be obtained through Weld County in the event any work is performed in the public right-of-way. g. Construction Stormwater Permit A Construction Stormwater Permit is needed for disturbing more than 1 acres. KMGG has area wide permit coverage under the State Colorado Department of Public Health and Environment, Water Quality Control Division,Permit Number COR-039803. h. Non-Exclusive License Agreement/Road Maintenance Agreement A Non-Exclusive License agreement will be obtained from Weld County for Weld County Road 33 were we are utilizing the unmaintained section line of right-of-way to access our parcel This Non-Exclusive License Agreement will ensure legal access to our parcel and make it understood the County does not maintain this right-of-way.Additionally,KMGG will obtain a Road Maintenance Agreement for WCR 33. 4. TRAFFIC Compressor Station: The construction process for the compressor station will involve site grading with equipment, including but not limited to,motor graders,front end loaders, excavation equipment, and possibly scrapers. Heavy hauls involving the compressor units and some of the larger process equipment will be necessary,as will the use of large truck mounted cranes to unload and set this equipment. The length of the heavy haul trailers will determine the required access to the site off the county roads,although typically this has been an apron off the county road of about 75 to 100 feet necking down to a fenced and or gated opening of around 40 feet.This would depend on the available turning radius off the county road. There will also be concrete trucks and pumpers on a regular basis during construction. Anticipated staffing during the construction of the facility is estimated at 30 to 40 personnel during peak construction, 3 to 4 office trailers and 5 to 8 tool and parts vans/conex buildings. Please see Use by Special Review Questionnaire for traffic detail post construction. Laydown Yard: Since the laydown yard will not be graded there is very little construction equipment involved with the preparation of the site for use. APC/KMGG estimates 10 to 20 trips per day initially to store items in the yard,this will reduce to approximately 1 to 5 trips per day over the life of the yard for loading and unloading purposes. 5. DUST ABATEMENT PLAN During the construction phase of the project, APC/KMGG,will use or contract to have water trucks utilized to maintain dust suppression and fugitive particulate emissions. Also,the Stormwater Management Plan will be followed to mitigate soil erosion during construction. After completion of construction,the perimeter of the property will be stabilized using appropriate native vegetation,usually a combination of dry land/grass mixture or crop. Additionally KMGG will gravel all access and driving surfaces affected. Areas inside the fence line will be compacted and stabilized. If necessary,KMGG will also use or contract to control dust after construction. 6. FIRE AND EMERGENCY RESPONSE There is adequate provision for the protection of the health, safety,and welfare of the inhabitants of the neighborhood and county. Cannon Compressor Station&Laydown Yard T3N-R66W Sec 34 Weld County, Colorado 11 All roads leading to the site and within the site will be designated and maintained to support fire apparatus. A turnaround may be constructed as necessary to accommodate fire apparatus. In addition to above-referenced rules and regulations, APC/KMGG is also subject to COGCC Rule 6064 pertaining to fire prevention and protection. APC/KMGG has support personnel in the field or on call at all times to provide technical assistance in fire prevention and elimination. Cannon Compressor Station&Laydown Yard T3N-R66W Sec 34 Weld County, Colorado 12 WELD COUNTY ACCESS PERMIT pee Weld County Public Works Dept. 34i\ IWA Phone: (970)304-6496 •1111 H Street After Hours: (970)356-4000 P.O. Box 758 -o Astir (i Emergency Services: (970)304-6500 x 2700 Greeley, CO 80632 GBH Q� Inspection: (970)304-6480 Z/CW° Permit Number: AP14-00511 Issuance of this permit binds applicant and its contractors to all requirements,provisions,and ordinances of Weld County,Colorado. Project Name: PRE14-0250 Cannon Compre: Expiration date: 05/04/2015 Applicant Information: Property Owner Information: Name: Kelsey Dunlap Name: Nathan Keiser Company: Kerr-McGee Oil&Gas Onshore LP Company: Anadarko E&P Company LP Phone: 720-929-6448 Phone: Email: kelsey.dunlap@anadarko.com Email: nathan.keiser@anadarko.com Location: Proposed Use: Access is on WCR: 26 Temporary: Nearest Intersection WCR: 26 &WCR: 31 Single Residential: Distance From Intersection: 5270 Industrial: Number of Existing Accesses: 3 Small Commercial: Planning Process: Other PRE14-0250 Oil&Gas: Large Commercial: Road Surface Type&Construction Information: Subdivision: Road Surface: Gravel Field (Agricultural Culvert Size&Type: 15"CMP/RCP min. Only)/Exempt: Start Date: 02/01/2015 Finish Date: 03/01/2015 Materials to Construct Access: standard road base Required Attached Documents Submitted: Traffic Control Plan: No Certificate of Insurance: No Access Pictures: Yes A copy of this permit must be on site at all times during construction hours Daily work hours are Monday through Friday DAYLIGHT to 1/2 HOUR BEFORE DARK(applies to weekends if approved) Approved MUTCD traffic control/warning devices are required before work begins and must remain until completion of work Special Requirements or Comments Parcel 121134000008. Utilize existing upgraded access point on CR 26(1-Industrial)located approx. 5270 ft. East of CR 31. Approved by: Weld County Public Works Date: 11/17/2014 Print Date-Time: 11/17/2014 12:16:21PM Report ID: PW00008v001 Page 1 of 1 WELD COUNTY ACCESS PERMIT C. Weld County Public Works Dept. 34i\ yJ► Phone: (970)304-6496 1111 H Street After Hours: (970)356-4000 P.O. Box 758 -o Astir (i Emergency Services: (970)304-6500 x 2700 Greeley, CO 80632 GBH Q� Inspection: (970)304-6480 Z/CW° Permit Number: AP15-00082 Issuance of this permit binds applicant and its contractors to all requirements,provisions,and ordinances of Weld County,Colorado. Project Name: Cannon Temp. Laydown Yard Expiration date: 08/09/2015 Applicant Information: Property Owner Information: Name: Kelsey Dunlap Name: Company: Kerr-McGee Oil&Gas Onshore LP Company: Anadarko E&P Company LP Phone: 720-929-6448 Phone: Email: kelsey.dunlap@anadarko.com Email: Location: Proposed Use: Access is on WCR: 26 Temporary: Nearest Intersection WCR: 26 &WCR: 31 Single Residential: Distance From Intersection: 3460 Industrial: Number of Existing Accesses: 4 Small Commercial: Planning Process: Oil&Gas: El Large Commercial: Road Surface Type&Construction Information: Subdivision: Road Surface: Gravel Field (Agricultural Culvert Size&Type: 15"CMP/RCP min. Only)/Exempt: Start Date: Finish Date: Materials to Construct Access: existing-upgrade Required Attached Documents Submitted: Traffic Control Plan: No Certificate of Insurance: No Access Pictures: Yes A copy of this permit must be on site at all times during construction hours Daily work hours are Monday through Friday DAYLIGHT to 1/2 HOUR BEFORE DARK(applies to weekends if approved) Approved MUTCD traffic control/warning devices are required before work begins and must remain until completion of work Special Requirements or Comments Parcel 121134000008. Utilize existing upgraded access point on CR 26(1-O&G)located approx. 3460 ft. East of CR 31. Approved by: Weld County Public Works Date: 2/17/2015 Print Date-Time: 2/17/2015 3:19:23PM Report ID: PW00008v001 Page 1 of 1 Cannon Compressor Station - Emergency Contact Information 1. General Information: The purpose of this document is to provide ownership information case of emergency. It may be used by outside agencies,company employees,and contract labor to help secure a speedy recovery from such emergency situations. A.Name and Address: Kerr-McGee Gathering,LLC 1099 18th St, Suite 1800 Denver,CO 80202 B.Type of Facility: Compressor Station C.Location and Access: Part of the southeast quarter of section 34,Township 3 North, Range 66 West. 6th P.M. All proper warning signs and equipment guards will be installed. 2. Emergency Contact List: The following is a list of Kerr-McGee Gathering,LLC(KMGG)an Anadarko(APC)company,personnel and organizations that may be contacted in the event an emergency occurs at the facility. Due to the nature of this being a midstream facility, any emergency will necessitate KMGG personnel to respond to the issue and resolve with our standard company protocol. KMGG has trained personnel available to respond to incidents and engage local officials as appropriate. KMGG Integrated Operations Center(IOC)provides 24 hours a day 7 days a week monitoring and emergency response,and can be reached at 1-866-504-8184. In any case the following KMGG personnel can be reached if necessary: Kerr McGee Gathering LLC an Anadarko Company-Emergency Contact List: Contact Phone Number Notes Anadarko and Kerr-McGee (970) 339-1020 24/7 Emergency Response Integrated Operating Center(IOC) (866) 504-8184 Number Scott Rovira, (720) 929-6243-o Drilling and completion General Manager (281) 702-0652- m operations. (720)929-7226-o Drilling and completion Shane Fross-General Operations Director (307)680-8670- m operations. (720) 929-6246 - o Production and Midstream Rex Specht—Operations Advisor (303) 241-3582 - m Operations Michael Lutkin (970) 515-1266-o Gathering and compression Production Superintendent (970) 397-0431 - m operations Randy Lavalleur (303) 655-5376 - o Production Superintendent (303)815-8247-m Plant operations Charles Chase, (970)515-1176-o Midstream operations. Sr. HSE Representative (307)399-3911-m Rick Morrish (970) 515-1157- o Staff HSE Representative (303) 570-4745—m Midstream operations. Patrice Barnett (970)515-1332-o HSE Representative II (720) 325-3429-m Jeff Jones (970) 515-1421-o Sr Staff HSE Representative (307) 262-2899-m Midstream Emergency Response Contact List: Incident Contact Phone Number Comments Fire, explosion, Platteville-Gilcrest Fire 911 or serious injury Protection District (970) 785-2232 Weld County Sherriff's 911 or Office (970) 356-4015 COGCC (303) 894-2100 Fire, explosion, associated with Platteville-Gilcrest Fire 911 or loss of well Protection District (970) 785-2232 control Weld County Sherriff's 911 or Office (970) 356-4015 COGCC (303) 894-2100 Wild Well Control, Inc. (281)353-5481 Commercial well control contractor. Reporting required for spills of crude oil, produced water, or E&P waste Spill or release COGCC (303) 894-2100 exceeding 5 bbl in containment or 1 bbl outside of containment, or all spills that impact surface or ground water Platteville-Gilcrest Fire 911 or Reporting required for spills impacting Protection District (970) 785-2232 surface water or for reportable quantity spills of CERCLA hazardous substances. Colorado Department Reporting required for spills impacting of Public Health and (800) 886-7689 surface water or for reportable quantity Environment spills of CERCLA hazardous substances. Reporting required for spills impacting US EPA (800) 227-8917 surface water or for reportable quantity spills of CERCLA hazardous substances. National Response (800) 424-8802 Reporting required for spills impacting Center surface water or for reportable quantity spills of CERCLA hazardous substances. A commercial spill clean-up and Clean Harbors (406) 370-6595 response contractor Noise Abatement Plan—Cannon Compressor Station Introduction The Cannon Compressor Station is a proposed Kerr-McGee Gathering,LLC(KMGG)facility located in Weld County. This facility is needed to help transport the increasing amounts of natural gas to processing facilities where it is then prepared for sale to market. KMGG has taken steps to attenuate noise originating from this site and will continue to take the necessary actions to comply with COGCC noise regulation. The following plan outlines how noise is mitigated at the Cannon Compressor Station site. Location and Surrounding Land Use The proposed Cannon Compressor Station is located approximately 760 feet mile north of the intersection of WCR 26 and WCR 33 in an area zoned for agriculture with limited/extensive residential development. Proposed Improvements KMGG is proposing the installation eight (8)compressors. There will be six (6) CAT3606LE/Ariel JGK- 3, and two(2) 3750 HP units. There will also be one 60,000 gallon slug catcher,three(3)30 MMscfd coalescing filter separators, three(3) 30 MMscfd TEG dehydrator-condenser-VRU, one condensate pump skid and associated piping and electrical infrastructure. Noise Regulation and Goal There is no equipment presently at the proposed site. Under the current COGCC regulations,permissible noise levels cannot exceed 55 dBA during the day or 50 dBA at night. KMGG will ensure the installed equipment complies with these COGCC regulations. KMGG also has the ultimate goal of not exceeding 50 dBA at all times and will be measured at the fence line of the facility. Efforts to Date KMGG has already begun efforts to reduce noise on-site by designing High Specification Noise Suppression Packages(HSNSP)for the first three Cat3606LE/Ariel JGK-3 compressor/cooler packages. This includes a cooler silencer,a noise attenuated building over the engine and compressor,a combustion air intake silencer,and a hospital grade muffler on the engine exhaust. The other three proposed CAT3606LE/Ariel and two 3750 HP will be installed with the same cooler silencers and hospital grade mufflers on the engine exhaust or lower noise emitting coolers. Assessment and Attenuation Upon operation KMGG will conduct a noise survey to determine if noise levels meet COGCC requirements. If noise exceeds levels then sound walls or insulation will be built around the identified problem equipment. Ventilation packages may also need to be installed to ensure that the equipment is able to operate while being completely enclosed. 9127 S.Jamaica Street East Building Englewood, Colorado 80112 Phone: 303-771-0900 March 5, 2015 Weld County Department of Public Works Public Works Development Engineer 1111 H Street Greeley, Colorado 80631 Subject: Anadarko Petroleum Corporation's Proposed Cannon Compressor Station— Drainage Narrative (Revision 2—added the 17 acre storage yard) To Whom It May Concern: The proposed compressor station site is located in Weld County, Colorado, approximately 4 miles Southeast of Platteville in the North 1/2 of the SE 1/4 of Section 34,Township 3 North, Range 66 West of the 6th Principal Meridian. The project entails the construction of a new compressor station that will be used to transport natural gas through pipelines. The developed site will encompass approximately 9.4 acres within the 161.4 acre platted parcel, numbered 121134000008, that is owned by Anadarko E&P Company, LP. This letter is intended to provide a summary of the site drainage plan for the proposed Cannon Compressor Station for the purpose of requesting a waiver from the Weld County Code requirement to provide stormwater detention. Additionally, Anadarko is intending to use 17 acres of the same parcel as a storage area for pipe and equipment. EXISTING SITE DESCRIPTION The site of the proposed compressor station is situated 2100 feet North of Weld County Road 26, and 1400 feet West of Weld County Road 33. The site consists of undeveloped rangeland. The remainder of the parcel is mostly undeveloped rangeland, with several natural gas wellheads and associated small diameter condensate tanks, and a vacant residence on the south border adjacent to Weld County Road 26. The concrete lined Spear Canal traverses the quarter section entering from the lower east side and exiting the upper west side. The areas surrounding the parcel also consist of undeveloped rangeland with oil and gas production facilities in all directions. The west side of the parcel, located south of the Spear Canal, generally slopes to the west at grades from 1%to 3%. The remainder of the parcel slopes downward from the South to the North at grades ranging from 1%to 3%. The existing site drainage at the location of the proposed compressor station flows to a shallow but large depression located northwest of the station site. Most drainage appears to then infiltrate into the soil. Larger runoffs sheetflow to the north onto another parcel consisting of undeveloped rangeland except for several natural gas wellheads and a condensate collection facility. The entire parcel where the compressor station site will be located is comprised of Valent sands based on the Soil Map determined from the Natural Resources Conservation Service Web Soil Survey. Valent sands belong to Hydrologic Soil Group A which have a low runoff potential when thoroughly wet. The site is not located within a FEMA designated 100 year floodplain, as per Flood Insurance Rate Map number 080266-0860-C. The existing parcel percentage impervious was calculated to be 2.8%. PUBLIC WORKS DEVELOPMENT ENGINEER PAGE 2 MARCH 5, 2015 The 17 acre area that will be used as a storage yard is located in the southwest corner of the parcel, and will be accessed by an existing access drive off of Weld County Road 26, approximately 1830 feet east of the intersection with Weld County Road 33.The site consists of undeveloped rangeland with heavy grasses, and slopes towards the west and southwest at grades of 1%to 3%. Drainage is intercepted by a shallow borrow ditch on the north side of Weld County Road 26. Excess runoff overflows the road to a larger borrow ditch on the south side of the road. PROPOSED SITE DESCRIPTION The proposed compressor station site would include skidded buildings and equipment placed on concrete piers and foundations,gravel roads, and gravel finished working surfaces. The existing parcel drainage that presently drains onto the site, would be directed around the site using a proposed 1 foot high earthen berm that will be replanted with native grasses. The diverted drainage will follow the historical path to the existing depression noted above, where it will infiltrate into the soil. The onsite drainage would be directed outward from the center of the site to drainage channels located around the perimeter of the site. The channels will be sloped to a proposed Water Quality Capture Feature located on the northwest perimeter of the site. Runoff volumes in excess of the Water Quality Capture Feature capacity will exit through an overflow weir and will follow the historical drainage path. The drainage channels will be replanted with native grasses and protected with an erosion control blanket to allow for final stabilization. The existing parcel gravel access road will be improved and lengthened to access the proposed compressor station. This will result in a negligible increase in runoff, which will not pass through the Water Quality Capture Feature, but will either pass through the existing site depression northwest of the compressor station, or an additional existing depression northeast of the compressor station. The capacity of both of these depressions is sufficient to hold the Water Quality Capture Volume that is in their tributary catchment area. The parcel imperviousness, after the site development, along with existing site installations,will be 5.2%. The proposed storage yard will be used to store pipe and equipment used in developing hydrocarbon fields.The storage yard will include a two acre site that will be fenced, and the remaining 15 acres will be open. The yard will not be graded or graveled, and the equipment will be placed on cribbing which will allow the storm drainage runoff to infiltrate the soil under the stored materials. Therefore,the storage yard will not significantly increase the parcel imperviousness. WATER QUALITY CAPTURE FEATURE It is proposed that a Water Quality Capture Feature be provided, in lieu of a detention pond for the compressor station site. The Water Quality Capture Feature will allow stormwater run-off from the developed site to be collected and settle out any contaminants. The Water Quality Capture Volume (WQCV) of the feature is calculated based on the Urban Storm Drainage Criteria Manual, Volume 3,Section 3.3, Equation 3-1. WQCV= a(0.91P-1.19/2 +0.781) Where: WQCV =Water Quality Capture Volume (watershed inches) a = Coefficient corresponding to WQCV drain time, from Table 3-2 of the reference = 1.0, conforms to a 40 hour drain time as required in the Weld County Engineering and Construction Criteria, Section 5.11.1 PUBLIC WORKS DEVELOPMENT ENGINEER PAGE 3 MARCH 5, 2015 / = Composite Imperviousness of Site (%/100) The composite imperviousness of 0.36 for the compression station site was calculated based on the following data: LAND SURFACE CHARACTERISTICS IMPERVIOUS FACTOR TRIBUTARY (Note 1) CATCHMENT ACREAGE Roofs 0.90 0.62 Greenbelts, agricultural 0.02 1.81 Gravel (packed) 0.40 6.95 Concrete Foundations 1.00 0.06 TOTAL ACRES= 9.44 Note 1: Impervious factor from the Urban Storm Drainage Criteria Manual,Volume 1, Section 2.7,Table RO-3 Therefore, WQCV = 1.0[(0.91 x 0.363)-(1.19 x 0.36') + (0.78 x 0.36)] = 0.169 watershed inches The required storage volume of the basin is then calculated as: V= WQCV(A) 12 Where: V= Required storage volume (acre-feet) A= Tributary catchment area upstream (acres) Therefore,V = (0.169 watershed inches)(9.44 acres) 12 =0.13 acre-feet = 5793 cubic feet The proposed WQCV basin will provide a storage volume of 0.17 acre-feet, or 7317 cubic feet, at a maximum depth of 1 foot. The pond will infiltrate the soil in less than 40 hours. In the event of stormwater volumes in excess of the basin capacity, stormwater will overflow the basin and will sheet flow along the historic drainage path towards the northwest to the existing depression in the parcel, where it will also infiltrate the soil. Any overflow from the depression will continue to the north along the historic flow path. CONCLUSIONS Due to a total parcel imperviousness of only 5.2%, and no downstream impacts expected from the development of the compressor station site, a waiver of the Weld County Code requirement for stormwater detention is requested. A Water Quality Control Feature as indicated above, will be installed. PUBLIC WORKS DEVELOPMENT ENGINEER PAGE 4 MARCH 5, 2O15 Additionally,due to the insignificant increase in imperviousness, and the non-disturbance of the soils,the storage yard will not include any stormwater facilities. We appreciate your consideration in this matter, and please feel free to contact me with any questions Sincerely, .f 0 GJSA'�ti o3.5-Wc31 (cz31579 •"� Ronald B. Heitland, P.E. !► e Sr. Civil/Structural Engineer !< (720)286-4543 ron.heitland@ch2m.com STATE OF COLORADO John W.Hickenlooper,Governor Larry Wolk,MD, MSPH ti,ov colop Executive Director and Chief Medical Officero Dedicated to protecting and improving the health and environment of the people of Colorado 4300 Cherry Creek Dr.S. Denver,Colorado 80246-1530 �1g�6� Phone(303)692-2000 Colorado Department Located in Glendale,Colorado of Public Health www.colorado.gov/cdphe and Environment January 7, 2015 ACTION: APEN REQUIRED PERMIT EXEMPTED Joel Kenyon Kerr-McGee Gathering LLC PO Box 173779 Denver, CO 80217 RE: Permit Application No. 14WE1770 Dear Joel Kenyon: The Air Pollution Control Division (the Division) has reviewed your air emission permit application for the following engine: One (1) Cummins, Model 550 GFJC GTA38, Serial Number To Be Determined, natural gas-fired, turbo- charged, 4SRB reciprocating internal combustion engine, site rated at 720 horsepower. This engine shall be equipped with a non-selective catalytic reduction (NSCR) system. This emission unit will be used as a backup/emergency power generator. This engine will be located at the Cannon Compressor Station, in the NWSE Section 34, Township 3N, Range 66W, Weld County, Colorado. The Division has determined that this engine is exempt from permit requirements. The filing of an Air Pollutant Emissions Notice(s) (APEN) is required. The above emission unit is a listed source that is specifically exempt from construction permit requirements, per Regulation No. 3, Part B, Section II.D.1. Specifically, this exemption is granted because the engine is an emergency power generator that operates less than two hundred and fifty (250) hours per year (Regulation 3, Part B, Section II.D.1.c.(ii)). If this engine is replaced with another emergency power generator with less than two hundred and fifty (250) hours per year of operation, this exemption shall remain valid as long as a revised APEN is filed with the Division reflecting the change in equipment. This exemption from permit requirements is issued in reliance upon the accuracy and completeness of information supplied by the applicant and is conditioned upon construction, installation and operation in accordance with this information and with representations made by the applicant or applicant's agents. According to the Division's preliminary analysis, based on the submitted data and information, the equipment identified above will result in the emission of the following air pollutants. Annual fees will be billed for this source in accordance with and in the amounts and limits specified in the provisions of Colorado Revised Statutes section 25-7-114.1. AIRS: 123/9D52/004 Page 1 of 2 NGEngine XP Version 2014-1 Facility Equipment AIRS Point Tons per Year ID NOx CO VOC GEN-15 004 0.6 0.2 0.3 It should be noted that although exempted sources may not need air emission permits, they are still required to meet all applicable standards and regulations of the Air Quality Control Commission, including visible emissions shall not exceed 20% opacity. A Revised Air Pollutant Emission Notice (APEN)shall be filed: (Reference: Regulation No. 3, Part A, Section II.C.) a. Annually whenever a significant increase in emissions occurs as follows: For any criteria pollutant: For sources emitting less than 100 tons per year, a change in actual emissions of five tons per year or more, above the level reported on the last APEN submitted; or For any non-criteria reportable pollutant: If the emissions increase by 50% or five (5)tons per year, whichever is less, above the level reported on the last APEN submitted to the Division. b. Whenever there is a change in the owner or operator of any facility, process, or activity; or c. Whenever new control equipment is installed, or whenever a different type of control equipment replaces an existing type of control equipment; or d. Whenever a permit limitation must be modified; or e. No later than 30 days before the existing APEN expires. Please refer to the most recent annual fee invoice to determine the APEN expiration date. For any questions regarding a specific expiration date call the Division at(303)-692-3150. Any changes with respect to the original submittal which would result in increases in either emissions or ambient air impacts, or which would result in the emission of any pollutants not listed in the original submittal, automatically nullifies this exemption. Before actually making any such change, you must apply to the Division for a new exemption based on the anticipated change; if the Division denies the new exemption, you will have to obtain a permit before implementing the change. Sincerely, Oluwaseun Ogungbenle Permit Engineer Stationary Sources Program Air Pollution Control Division PERMIT EXEMPTED AIRS: 123/9D52/004 Page 2 of 2 NGEngine XP Version 2014-1 STATE OF COLORADO John W.Hickenlooper,Governor - Larry Wolk, MD,MSPH •°4 `°io a� .x Executive Director and Chief Medical Officer r -<<:,:a:r•'� Dedicated to protecting and improving the health and environment of the people of Colorado 4300 Cherry Creek Dr.S. Laboratory Services Division `.?is* Denver,Colorado 80246-1530 8100 Lowry Blvd. Phone(303)692-2000 Denver,Colorado 80230-6928 Located in Glendale,Colorado (303)692-3090 Colorado Department of Public Health www colorado,gov/cdphe and Environment January 7,2015 Jennifer Shea Kerr-McGee Gathering, LLC Po Box 173779 Denver, CO 80217-3779 RE: Oil & Gas RICE GP02 General Permit Approval for Package # 320005 Dear Jennifer Shea: The Colorado Air Pollution Control Division approves your company's registration of the equipment described below for coverage under general permit GP02 for natural gas fired reciprocating internal combustion engines (RICE) used at oil and gas sources. Please refer to general permit GP02 for all applicable requirements, limitations, terms and conditions. A copy of the general permit may be obtained via the Internet at the following web address: http://www.colorado.gov/cs/Satellite/CDPH E-AP/CBON/1251596446083 The following Table 1 contains identifying information for the engine to which this registration approval applies. Table 1 Company Name: KERR-MCGEE GATHERING, LLC Stationary Source "Plant" Name: CANNON COMPRESSOR STATION Emissions Point AIRS ID: 123-9D52-001 Stationary Source Location: NWSE 34 3N 66W EAST OF PLATTEVILLE WELD COUNTY APEN Document#: 320000 APEN Signature Date: 10/24/2014 The following Table 2 contains specific equipment information and process and emissions limits for the engine to which this registration approval applies. Table 2 Engine Manufacturer: Caterpillar Engine Model: G3606 LE Engine Serial Number: TBD Fuel Consumption Limit: 119A0 Million standard cubic feet per year 12.0 Tons NOX per year Emissions Limits: 4.3 Tons CO per year 7.5 Tons VOC per year The following Table 3 contains regulatory applicability and stationary source classification determinations for the engine to which this registration applies [1]. These classifications determine, in part ,what specific requirements are applicable under the general permit coverage Table 3 This engine subject to New Source Performance Standard (NSPS) Subpart: TBD This engine subject to Maximum Achievable Control Technology(MACT)area source TBD requirements for subpart: Is this engine located at a synthetic minor stationary source for Title V Operating Permit, New Yes Source Review, or MACT requirements? Is this engine located at a synthetic minor stationary source of NOx or CO? (If"yes", see Yes Section V.A of the permit to determine if stack testing is required). Is this engine located at a synthetic minor stationary source of formaldehyde? (If"yes", see Yes Section V.A of the permit to determine if stack testing is required). If you have any questions regarding this letter, please contact me directly at(303)691-4089. Sincerely, Oluwaseun Ogungbenle Permit Engineer Stationary Sources Program Air Pollution Control Division [1] If listed as"to be determined" (TBD)there was not sufficient information within the application to determine applicability. The operator has an obligation to comply with a requirement within the general permit to determine and document all applicable requirements under both NSPS JJJJ and MACT ZZZZ. STATE OF COLORADO John W.Hickenlooper,Governor - Larry Wolk, MD,MSPH •°4 `°io a� .x Executive Director and Chief Medical Officer r -<<:,:a:r•'� Dedicated to protecting and improving the health and environment of the people of Colorado 'i,,,, •• t 4300 Cherry Creek Dr.S. Laboratory Services Division `.?is* Denver,Colorado 80246-1530 8100 Lowry Blvd. Phone(303)692-2000 Denver,Colorado 80230-6928 Located in Glendale,Colorado (303)692-3090 Colorado Department of Public Health wwnv colorado,gov/cdphe and Environment January 7,2015 Jennifer Shea Kerr-McGee Gathering, LLC Po Box 173779 Denver, CO 80217-3779 RE: Oil & Gas RICE GP02 General Permit Approval for Package # 320005 Dear Jennifer Shea: The Colorado Air Pollution Control Division approves your company's registration of the equipment described below for coverage under general permit GP02 for natural gas fired reciprocating internal combustion engines (RICE) used at oil and gas sources. Please refer to general permit GP02 for all applicable requirements, limitations, terms and conditions. A copy of the general permit may be obtained via the Internet at the following web address: http://www.colorado.gov/cs/Satellite/CDPH E-AP/CBON/1251596446083 The following Table 1 contains identifying information for the engine to which this registration approval applies. Table 1 Company Name: KERR-MCGEE GATHERING, LLC Stationary Source "Plant" Name: CANNON COMPRESSOR STATION Emissions Point AIRS ID: 123-9D52-002 Stationary Source Location: NWSE 34 3N 66W EAST OF PLATTEVILLE WELD COUNTY APEN Document#: 320001 APEN Signature Date: 10/24/2014 [1] If listed as "to be determined" (TBD)there was not sufficient information within the application to determine applicability. The operator has an obligation to comply with a requirement within the general permit to determine and document all applicable requirements under both NSPS JJJJ and MACT ZZZZ. The following Table 2 contains specific equipment information and process and emissions limits for the engine to which this registration approval applies. Table 2 Engine Manufacturer: Caterpillar Engine Model: G3606 LE Engine Serial Number: TBD Fuel Consumption Limit: 119.40 Million standard cubic feet per year 12.0 Tons NOX per year Emissions Limits: 4.3 Tons CO per year 7.5 Tons VOC per year The following Table 3 contains regulatory applicability and stationary source classification determinations for the engine to which this registration applies [1]. These classifications determine, in part ,what specific requirements are applicable under the general permit coverage Table 3 This engine subject to New Source Performance Standard (NSPS) Subpart: TBD This engine subject to Maximum Achievable Control Technology(MACT)area source TBD requirements for subpart: Is this engine located at a synthetic minor stationary source for Title V Operating Permit, New Yes Source Review, or MACT requirements? Is this engine located at a synthetic minor stationary source of NOX or CO? (If"yes", see Yes Section V.A of the permit to determine if stack testing is required). Is this engine located at a synthetic minor stationary source of formaldehyde? (If"yes", see Yes Section V.A of the permit to determine if stack testing is required). If you have any questions regarding this letter, please contact me directly at (303) 691-4089. Sincerely, Oluwaseun Ogungbenle Permit Engineer Stationary Sources Program Air Pollution Control Division [1] If listed as"to be determined" (TBD)there was not sufficient information within the application to determine applicability. The operator has an obligation to comply with a requirement within the general permit to determine and document all applicable requirements under both NSPS JJJJ and MACT ZZZZ. STATE OF COLORADO John W.Hickenlooper,Governor - Larry Wolk, MD,MSPH •°4 `°io a� .x Executive Director and Chief Medical Officer r -<<:,:a:r•'� Dedicated to protecting and improving the health and environment of the people of Colorado 'i,,,, •• t 4300 Cherry Creek Dr.S. Laboratory Services Division `.?is* Denver,Colorado 80246-1530 8100 Lowry Blvd. Phone(303)692-2000 Denver,Colorado 80230-6928 Located in Glendale,Colorado (303)692-3090 Colorado Department of Public Health wwnv colorado,gov/cdphe and Environment January 7,2015 Jennifer Shea Kerr-McGee Gathering, LLC Po Box 173779 Denver, CO 80217-3779 RE: Oil & Gas RICE GP02 General Permit Approval for Package # 320005 Dear Jennifer Shea: The Colorado Air Pollution Control Division approves your company's registration of the equipment described below for coverage under general permit GP02 for natural gas fired reciprocating internal combustion engines (RICE) used at oil and gas sources. Please refer to general permit GP02 for all applicable requirements, limitations, terms and conditions. A copy of the general permit may be obtained via the Internet at the following web address: http://www.colorado.gov/cs/Satellite/CDPHE-AP/CBON/1251596446083 The following Table 1 contains identifying information for the engine to which this registration approval applies. Table 1 Company Name: KERR-MCGEE GATHERING, LLC Stationary Source "Plant" Name: CANNON COMPRESSOR STATION Emissions Point AIRS ID: 123-9D52-003 Stationary Source Location: NWSE 34 3N 66W EAST OF PLATTEVILLE WELD COUNTY APEN Document#: 320002 APEN Signature Date: 10/24/2014 [1] If listed as "to be determined" (TBD)there was not sufficient information within the application to determine applicability. The operator has an obligation to comply with a requirement within the general permit to determine and document all applicable requirements under both NSPS JJJJ and MACT ZZZZ. The following Table 2 contains specific equipment information and process and emissions limits for the engine to which this registration approval applies. Table 2 Engine Manufacturer: Caterpillar Engine Model: G3606 LE Engine Serial Number: TBD Fuel Consumption Limit: 119.40 Million standard cubic feet per year 12.0 Tons NOX per year Emissions Limits: 4.3 Tons CO per year 7.5 Tons VOC per year The following Table 3 contains regulatory applicability and stationary source classification determinations for the engine to which this registration applies [1]. These classifications determine, in part ,what specific requirements are applicable under the general permit coverage Table 3 This engine subject to New Source Performance Standard (NSPS) Subpart: TBD This engine subject to Maximum Achievable Control Technology(MACT) area source TBD requirements for subpart: Is this engine located at a synthetic minor stationary source for Title V Operating Permit, New Yes Source Review, or MACT requirements? Is this engine located at a synthetic minor stationary source of NOX or CO? (If"yes", see Yes Section V.A of the permit to determine if stack testing is required). Is this engine located at a synthetic minor stationary source of formaldehyde? (If"yes", see Yes Section V.A of the permit to determine if stack testing is required). If you have any questions regarding this letter, please contact me directly at (303) 691-4089. Sincerely, Oluwaseun Ogungbenle Permit Engineer Stationary Sources Program Air Pollution Control Division [1] If listed as"to be determined" (TBD)there was not sufficient information within the application to determine applicability. The operator has an obligation to comply with a requirement within the general permit to determine and document all applicable requirements under both NSPS JJJJ and MACT ZZZZ. SITE SPECIFIC DEVELOPMENT PLAN USE BY SPECIAL REVEWW PERMIT DEVELOPMENT STANDARDS - DRAFT ' -M�� "G `� USR14-0079 1. THE SITE SPECIFIC DEVELOPMENT PLAN AND USE BY SPECIAL REVIW PERMIT, USR14-0079, IS FOR MINERAL RESOURCE DEVELOPMENT FACLIIES INCLUDING - OL D GAS SUPPORT AND SERVICE FACIBES (COMPRESSOR STATION FOR NATURAL GAS AND ALL RELATED EQUIPMENT, INCLUDING. BUT NOT LINKED TO, EIGHT (B) PRESSORS, VAPOR RECOVERY UNITS, SEPARATORS, DEHYDRATORS, STORAGE TANKS, AND ONE (1) SEVENTY-FOOT IN HEIGHT COMMUNICATION TOWER) IN A PARCEL OF LAND LOCATED IN THE SOUTHEAST QUARTER THE A ULTURAL) ZONE DISTRICT, SUBJECT TO THE DEVELOPMENT STANDARDS STATED HEREON. OF SECTION 34, TOWNSHIP 3 NORTH, RANGE 66 WEST OF 2. APP AL OF THIS PUN MAY CREATE A VESTED PROPERTY RIGHT PURSUANT TO SECTION 23-8-10 Cf THE WELD COUNTY CODE. THE 6TH PRINCIPAL MERIDIAN, WELD COUNTY, COLORADO 3. THE OF OPERATION WEL BE 24 HOURS A DAY, SEVEN (7) DAYS A WEER, AS STATED BY THE APPLICINNT. 4. THE SIG ON THE SITE SHALL BE MAINTAINED IN ACCORDANCE WITH NE APPROVED SENAGE PLAN. 5. THE LAN NG AND SCREDSING ON THE SITE SHALL BE MAINTAINED IN ACCORDANCE WITH THE APPROVED LANDSCAPING/SCREENING PLAN. ei 6. SHOULD NOXIO WEEDS EXIST ON THE PROPERTY, OR BECOME ESTABLISHED AS A RESULT OF THE PROPOSED DEVELOPMENT, THE APPUCMT/LANDOWNER \ill -" N./ \ ` Iii 11 PLANNING COMMISSION CERTIFICATION g SHALL. BE RESPONSI FOR CONTROLLING THE NOXIOUS WEEDS, PURSUANT TO CHAPTER 15, ARTICLES I AND II, OF THE WELD COUNTY CODE \) I 121128000029 171/27100028 121126000001 I This is the certify that the Weld County Planning Commission has certified and does hereby recommend to the Board of S4k1^/E1; SCOTT avv 84R1YAY FARMS [LC N'4RFRYF ARTHUR G m 7. TIE HISTORICAL PATTERNS AND RUNOFF AMOUNTS WILL BE MAINTAINED ON THE SITE WELD COUNTY IS NOT RESPONSIBLE FOR TIE MAINTENANCE OF v I l County Commissioners, Weld County, Colorado, for its confirmation, approval and adoption this Site Specific ON—SITE DRAINAGE RELA FEATURES. 4976 c �� I27 • 0I \ \ Development Plan and Use by Special Review as shown and described thereon this day of • 0 B. THERE SHALL BE NO OR STAGING OF VEHICLES ON COUNTY ROADS. ON—SITE PARKING SHALL BE UTILIZED. 7 COtNAITY ROM) 28 et 34 96 111 20 49 a 9. ALL LIQUID AND SOLE AS DEFIED IN TIE SOLD WASTES DISPOSAL stirs AND FACIIIES ACT, 30-20-100.5, C.R.S., SHALL BE STORED AND F REMOVED FOR FMIAL DISPOSAL A MANNER THAT PROTECTS AGAINST SURFACE AND GROUNDWATER CONTAMINATION. N 10. NO PERMANENT DISPOSAL ASTES SHALL BE PERMITTED AT THIS SITE THIS IS NOT MEANT TO INCLUDE THOSE WASTES SPECIFICALLY EXCLUDED FROMes-N ` THE Dff1NITON OF A SOLID W THE SOLD WASTES DISPOSAL SITES AND FACIITES ACT, SECTION 30-20-100.5, C.R.S. ( Chair, Weld County Planning Commission m 12113401010O25% I ~ 11. WASTE MATERIALS SH LL BE STORED, AND DISPOSED IN A MANNER TWAT CONTROLS FUGiTIVE DUST, BLOWING DEBRIS, AND OTHER POTENTIAL S1YIIgEllpl TtA?JftSle)) ( `.i NUISANCE CONDITIONS. THE APPLICANT OPERATE N ACCORDANCE WITH THE APPROVED WASTE HANDLING PLAN, AT All TIMES. R \\ L. 12. FUGITIVE DUST AND F1IGiTIVE PARITC TE EMISSIONS SFWl BE CONTROLLED ON NE SIZE THE FA(%JIl SHALL BE OPERATED IN ACCORDANCE WIN THE r71133aOD0r2 4J I 1211 `34000009 ' 1211,1\5000110.1%", c BOARD OF COUNTY COMMISSIONERS GEBIJ[1GAIlI?N APPROVED DUST ABATEMENT PLAN, AT ALL S4R 3'El. JOYCE E e48cur FAR145 L c NILES, MILLER FAMILY ArdYS u FAMILY TRUST(5Qi) I / I I Wien ET This is the certify that the Board of County Commissioners, Weld County, Colorado, does hereby confirm and adopt this i 13. ADEQUATE DRINKING, HANDWASHNG AND ACIRES SHALL BE PROMDED FOR EMPLOYEE AND PATRONS OF TIE FACILITY, AT ALL TIMES. AS J Site Specific Development Plan and Use by Special Review and Development Standards as shown and described f EMPLOYEES OR CONTRACTORS ARE ON—SITE LESS,THAN IWO (2) CONSECUTiE HOURS A DAY, PORTABLE TOILETS AND BOTTLE) WATER ARE ACCEPTABLE 1 I I 4*35 hereon this _ day of , 20 RECORDS OF MAINTENANCE AND PROPER FOR PORTAB E TOLES SHALL BE RETAINED ON A QUARTERLY BASIS AND AVAILABLE FOR RENEW BY THE O /21x340OO022 PI WELD COUNTY DEPARTMENT OF PUBLIC HEALTH ENWRONMENT (WCDPHE). PORTABLE TOILETS SWILL BE SERVICED BY A CLEANER LICENSED IN WED COUNTY w I HEIDI L. WAG 1R E ROOlliT W. ( � ec AND SHALL CONTAIN HAND SANfi1ZERS. * 0PR0Pl16ED 2 �'�; )- 1-3a n / Chair, Board of County Commissioners i 14. ALL POTENTIALLY HAZARDOUS CIEMICALS MUST HANDLED IN A SAFE MANNER IN ACCORDANCE WITH PRODUCT LABELING AND IN A MANNER THAT I �r ' `1 SALON 2 < MINIMIZES DIE RELEASE OF HAZARDOUS NR POLLUT (FLAP'S) AND VOLATILE ORGANIC COMPOUNDS (VOC's). ALL CFEINCALS MUST BE STORED SECURE, ON PI ---- _ — — _ — _ T � O/ ATTEST: 6 AN IMPERVIOUS SURFACE, AND IN ACCORDANCE WITH UFACTURER'S RECOMMENDATIONS. 15. THE SPLL PREVENTION, CONTROL AND COUNTERM PLAN SHALL BE AVAIABLE ON THE SIZE AT ALL TIES. c3r . 1 1 {tau Weld County Clerk to the Board g 16. THIS FACILITY SHALL ADHERE TO THE MAXIMUM PERMIS NOISE LEVELS ALLOWED IN THE NON—SPECFiED ZONE. AS DEUNEATED IN SECTION 14-9-30oi BY: Dated: OF THE WELD COUNTY COIL OR WITH ALL APPUCABLE STA STATUES AND/OR REGULATIONS. THE APPLICANT SHALL OPERATE IN ACCORDANCE WITH THE L a F \, 5 I, SWITCHYARD /FUTURE CANNON / Z APPROVED NOISE ABATEMENT FUN AT ALL TINES. \ m 17. THE APPLICANT SHAT OBTAIN A COLORADO DISCHARGE PER SYSTEM (COPS) PERMIT FROM THE COLORADO DEPARTMENT OF PUBLIC HEALTH AND / ; - H i \ 1211 350000J i ENVIRONMENT (CDPFE).ft , WATER QUALITY CONTROL DIVISION, AS AP t +�--�-.% LCA NON- LW CO �� 121133400007(1 I AASIOIIBK0 lP \ ` Ilr. -ACCESS I II Lit 18. IN ACCORDANCE WITH COLORADO OL AND GAS CONSERVATION C MISSION (COOCC) RULE 604, A SPILAGE RETENTION BERM SHALL BE CONSTRUCTED DRILL [LC ff P PROPERTY OWNER'S CERTIFICATION AROUND DE ABOVEGROUND STORAGE TANKS. TIE VOLUME RELINED THE SPRUCE BERM SHOULD BE GREATER THAN NE VOLUME OF THE LARGEST TANK T J \ i INSIDE THE BERM AND Sl1FF10EM FREEBOARD TO CONTAIN PRECF'ITA ALIERNATNE PROTECTIVE MEASURES MAY BE ALLOWED PROVIDED THEY COMPLY WITH — ---, �• PROPOSED CANNON \ j // The undersigned major property owner(s) do hereby agree to the Site Specific Development Plan and Use by Special S THE COLORADO a< AND GAS CONSERVAl10N COMMISSION REGtNATONS. y O STORAGE YARD \ ,• 1211341O0OO8 I �� / Review Development Standards as descrlbed hereon this _ day of 20_ •` N4VA.RK0 Ldp COMPANY LP i 19. TIE OPERATION SHALL COMPLY WITH ALL APPLICABLE RULE AND REG TONS Of STATE AND FEDERAL AGENCIES AND THE WELD COUNTY CODE. I f 20. SOURCES OF LIGHT SHALL BE SHIELDED SO THAT LIGHT RAYS WIL NOT NE DIRECTLY ONTO ADJACENT PROPERTIES WHERE SUCH WOUND CAUSE A I Y1c/ Bl� �r NUISANCE OR INTERFERE WITH THE USE ON DE ADJACENT PROPERTIES IN ACC DANCE WITH 71€ PUN. NH3IFER THE DIRECT, NOT REFLECTED, LJ(iIT FROM ' In .d y{ J�2 Signature ANY LIGHT SOURCE MAY CREATE A TRAFFIC HAZARD TO OPERATORS OF MOTOR (GEES ON PUBLIC OR PRIVATE SIRE. NO COLORED LIGHTS MAY BE USED 33 ' 34✓ c. •_ �__ • — EH '= r Michael A. Nixson o WENCH MAY BE CONFUSED WITH, OR CONSTRUED AS, TRAFFIC CONTROL DEVICES. ► COUNTY ROAD 26 3 2, j I Anadarko E&P Company LP 4 'S 1I 0 21. BUILDING PERMITS MAYBE REQUIRED, PER SEMEN 29-3-10 OF THE WELD COIL CU Y THE FOLLOWING HAS BEEN ADOPTED BY WELD 1 1 � 17/9QTA00001 G-2\o COUNTY: 2012 INTERNATIONAL CODES; 2006 INTERNATIONAL ENERGY CODE 2011 NA ELE CODE A BLINDING PERMIT APPLICATION MUST BE §Tr 1 ( , I \ GWMW LAD CO h o COMPLETED AND TWO (2) COMPLETE SETS OF ENG14wtU PLANS BEARING THE WET P OF A COLORADO REGISTERED ARCHITECT OR ENGINEER MUST BE 13090/000001 \SUBMIT LLD FOR REVIEW. A GEOTECHNICAL ENGINEFRNG REPORT, PERFORMED BY A C REGISTERED ENGINEER, SAW BE REQUIRED OR AN OPEN HOLEI . II/ / INSPECTION. ` GRAPHIC SCALE22. THE PROPERTY OWNER OR OPERATOR SHALL BE RESPONSIBE FOR COMPLING WITH DESIGN AND OPERATION STANDARDS OF CHAPTER 23 OF THE i !!! ` 400 a .00 1600 I = -\Jp� ywaD couNn cooE. \ I1 LOCATION MAP �I ' ' - ) '`' IN MT o .� a N 23. NECESSARY PERSONNEL FROM THE WELD COUNTY DEPARTMENTS OF PUNNING SERVICES, WORKS, AND PUBLIC HEALTH AND ENVIRONMDJT SHALL BE ^� r I / SCALE: 1' = 800'-0' 1 1 inch = 800 ft a COUNTY 80110 2e I e Ln o GRANTED ACCESS ONTO THE PROPERTY AT ANY REASONABLE TIME IN ORDER TO ENSURE THE CARRIED OUT ON NE PROPERTY COMPLY WITH THE 76 a C0NDITONS Of APPROVAL AND DEVELOPMENT STANDARDS STAID tom AND ALL APPLICABLE COUNTY REGULATIONS. C �5 C4 Z � a F 24. THE USE BY SPECIAL REVIEW AREA SHALL BE LIMITED TO THE PLANS SHOWN HEREON AND BY THE FORGOING STANDARDS AND ALL APPLICABLE l �'' c . \' �` WELD COUNTY REGULATIONS. SUBSTANTIAL CHANGES FROM THE PLANS OR DEVELOPMENi STANDARDS, SHOWN OR STATED, SHALL REQUIRE THE APPROVAL OF , a AN AMENDMENT OF THE PERMIT BY THE WELD COUNTY BOARD OF COUNTY COMMISSIONERS BEFORE CHANGES THE PLANS OR DEVELOPMENT ? { Q I o et STANDARDS ARE PERMITTED. ANY OTHER CHANGES SHALL BE FILED IN THE OFFICE OF THE DEPARTMENT PLANNING SERVICES. I (� ,� -1 ° • mvA�\`� ' 25. DE PROPERTY OWNER OR OPERATOR SHALL BE RESPONSIBLE FOR COMPLYING WITH ALL OF THE NG DEVELOPMENT STANDARDS. NONCOMPLIANCER \/" WITH ANY OF TIE FOREGOING DEVELOPMENT STANDARDS MAY BE REASON FOR REVOCATION OF NE PERMIT TIE BOARD OF COUNTY COMMISSIONERS. --- 7 �1 ' i i ii J26. WLD COUS RIGHT TO FARM STAENT: WELD COUNTY IS ONE OF THE MOST PRODUCTIVE AGRICULTU COUS N THE UNITED STATES, TYPICALLYo RANKING N TFE TOP LEN COUNTES IN THE COUNTRY N TOTAL MIARKEi VALUE OF AGRICULTURAL PRODUCTS 1}E RURAL AREAS OF WELD COUNTY MAY BE lre OPEN AND SPACOUS, BUT THEY ARE INiENSNELY USED FOR AGRICULTURE PERSONS MOVING INTO A RURAL UST RECOGNIZE AND ACCEPT THERE ARE DRAWBACKS, INCLUDING CONFLICTS WITH LONG-STANDING AGRICULTURAL PRACTICES AND A LOWER LEVEL OF 1HW N TOWN. ALN4G WiTH TFE USR14-0079 DRAWING INDEXDRAWBACKS COME TFE INCENTNf5 WHICH ATT RACE URBAN DWELLERS TO RELOCATE TO RURAL AREAS: OPEN NEWS. ACTOl1SNESS, WIDIFE LACK OF CiTY , n !NOISE AND CONGESTIONN, AND RURAL ATMOSPHERE AND WAY OF LFE WITHOUT NEIGHBORING FARMS, THOSE FEATU ATTRACT URBAN DWELLERS TD DRAWING NUMBER DRAWING TITLE REV REV. DATE 1 ( // RURAL WELD COUNTY WOULD QUICKLY BE GONE FOREVER. 1'*' '�!` 15-CANN-CS-4001 VICINITY AND LOCATION MAPS, AND NOTES D 2/4/2015 COUNTY ROAD 26 I I ',_ 6 AGRICULTURAL USERS OF THE LAND SHOULD NOT BE EXPECTED TO CHANGE THEIR LONG-ESTABLISHED AGRICULTURAL P ES TO ACCOMMODATE THE 15-CANN-CS-4002 OVERALL SITE PLAN D 2/4/2015 t 1 � eil INTRUSIONS OF URBAN USERS INTO A RURAL AREA WELL-RUN AGRICULTURAL ACTT/TIES WILL GENERATE OfF-SITE IMP INCLUDING NOISE FROM TRACTORS 15-CANN-CS-4003 ENLARGED SITE PLAN D 2/4/2015 �\ / \I /. �� a AND EQUIPMENT; SLOW-MOVING FARM VEHICLES ON RURAL ROADS; DUST FROM ANIMAL PENS, HELD WORK, HARVEST AND VEL ROADS; ODOR FROM ANIMAL -------‘-----)--- Fr / 2 4 I K C m CONFINEMENT. SILAGE AND MANURE SMOKE FROM DITCH BURNING; FLIES AND MOSQUITOS; HUNTING AND TRAPPING SHOOTING SPORTS. LEGAL HAZING 41 OF NUISANCE WI.DIFE; AND THE USE OF PESTICIDES AND FERRIZERRS IN TIE FIELDS, INCLUDING THE USE OF AERIAL SPRA . IT IS COMMON PRACTICE FOR �n-�� L.-, I J� a AGRICULTURAL PRODUCERS TO UTILIZE Al ACCUMULATION OF AGRICULTURAL MACHINERY AND SUPPLIES TO ASSIST IN THEIR AG LTURAL OPERATIONS. A , 1 I CONCENTRA11ON OF WISCEILMEOUS AGRICULTURAL MATERIALS OFTEN PRODUCES A VISUAL DISPARITY BETWEEN RURAL AND UR OF RE COUNTY. ; 1 VICINITY MAP } °' �� \ SECTION 35-3.5-102, C.R.S., PROVIDES THAT AN AGRICULTURAL OPERATION SHALL NOT BE FOUND TO BE A PUBLIC OR PRIVATE CE F THE AGRICULTURAL o • '•L I I 2 2'• r O OPERATION ALLEGED TO BE A NUISANCE EMPLOYS METHODS OR PRACTICES THAT ARE COMMONLY OR REASONABLY ASSOCIATED ULTURAL PRODUCTION. c SCALE 1' - 2000'-0' ≤ WATER HAS BEEN, AND CONTINUES TO BE, TIE LIFELINE FOR THE AGRICULTURAL COMMUNITY. IT IS UNREALISTIC TO ASSUME THAT TES AND RESERVOIRS MAY I SIMPLY BE MOVED "OUT OF THE WAY" OF RESIDENTIAL DEVELOPMENT. WHEN MOVING TO THE COUNTY, PROPERTY OWNERS AND RESI MUST REALIZE THEY CANNOT TAKE WATER FROM IRRIGATION DITCHES, LAKES, OR OTHER STRUCTURES, UNLESS THEY HAVE AN ADJUDICATED RIGHT TO THE 0 WELD COUNTY COVERS A LAND AREA OF APPROXIMATELY FOR THOUSAND (4,000) SQUARE MIES IN SIZE (TWICE THE SIZE OF THE STATE DELAWARE) WITH MORE THAN THREE THOUSAND SEVEN HUNDRED (3,700) MALES OF STATE AND COUNTY ROADS OUTSIDE OF MUNICF'NJTES. THE SHEER DE OF THE AREA SITE SOIL CLASSIFICATIONS i m TO BE SERVED STRETCHES AVAUBE RESOURCES. LAW ENFORCEMENT IS BASED ON RESPONSES TO COMPLAINTS MORE THAN ON PATROLS THE COUNTY, AND VAUNT SAND, 3 TO 9 PERCENT SLOPES. AREA - 100.0% THE DISTANCES WHICH MUST BE TRAVELED MAY DELAY ALL EMERGENCY RESPONSES, INCLUDING LAW DFORCEICIT, AMBULANCE AND FIRE PROTECii(NN IS V) USUALLY PROVIDED BY VOLUNTEERS WHO MUST LEAVE REF JOBS AND MILES TO RESPOND TO EMERGENCIES. COUNTY GRAVEL ROADS, NO TIER HOW OFTEN THEY ARE BLADED, WILLNOT PROVIDE TEE SAIL KIND OF SURFACE EXPECTED FROM A PAVED ROAD. SNOW REMOVAL PRIORITIES MEAN T ROADS AND 3 SUBDIMSONS TO ARTERIALS MAY NOT BE CLEARED FOR SEVERAL DAYS AFTER A MAJOR SNOWSTORM. SERVICES IN RURAL AREAS, N MANY NOT BE II I- EQUIVALENT TO MUNICIPAL SERVICES. RURAL DWELLERS MUST, BY NECESSITY, BE MORE SEE-SUFFICIENT THAN URBAN DWELLERS. as PEOPLE ARE EXPOSED TO DIFFERENT HAZARDS IN NE COUNTY THAN N AN URBAN OR SUBURBAN SETTING. FARM EOUNPMENT AND CC FIELD EQUIP , PONDS §1 AND IRRIGATION DITCHES. ELECTRICAL POWER FOR PUMPS AND CENTER PIVOT OPERATIONS, HIGH SPEED TRAFFIC, SAND BURS, PUNCTURE VINES, ,, FARM DOGS AND LAESiOCK, AND OPEN BURNING PRESENT REAL THREATS. CONTROWNG CHILDREN'S ACTMTES IS IMPORTANT, NOT ONLY FOR MEP i BUT ALSO FOR THE PROTECTION OF THE FARIER'S LIDIO0D. (WELD COUNTY CODE ORDINANCE 2002-6; WELD COUNTY CODE ORDINANCE 2008-13) 0 z 2 z I < 0 0 o NOTES REFERENCE DRAWINGS REVISIONS ,�e CANNON COMPRESSOR STATION , VICINITY AND LOCATION MAPS, AND NOTES 11 RE-ISSUED FOR PERMIT SPB4 5 `�' 4 5 / Alliadadall USE BY SPECIAL REVIEW - US R14-0079 SPB REM �y RE—ISSUED FOR PERMIT 1/15 5 1/15/15 DRAWN BY: SPB CREATION DATE 10/23/14 AFE No.: 2096379 -< ISSUED FOR PERMIT TB n 4 4 K" n/14/14 Petroleum Corporation APPROVED: — APPR. DATE oo sPB A ISSUED FOR CLIENT REVIEW 11 1 4 Rai 11 1 4 DWG. No.: SHEET No. D . NO. TITLE NO. oEscrRHPno14 Err OATS CM DATA: APPR DANE SCALE X91nlin.o.A. CO 2 ' 1R 15-CANAL-CS-4001 , � 3 SCALE AS NOTED ir----21 /'' /' / TRUE NORM / 1 / / / d i i ,__--..-_/ /, 1 / / /—COUNTY QUARTER / i !.. / / SECTION LINE / r I / / —.797- II I -- > - l i_ \/ / \\\ I \ o I / _J / / J /' / r _ _/l \ / `/ / 1 I/ ' / / / PARCEL BOUNDARY 1 \ I FENCED AND LOCKED GATE �_�\ r ' , \I/ / / --- _1 / r / / 1\ /-4995-\ 1AREA (300 FT. x 300 FT.) ,__. \.__/-' /'' / ^-. \ \ / / I /' I /I I WI \` / \L_ /. //. I /\- `` -^\'-l'-_�\` i ./- � '. �/� / \```�__-__- '"♦ 1\\ r\\` I\\ III O 1 r _ _ / �\ \ \\ ♦\ \ I J / I • \ m r \ / / -, / / / I \ I 1 1 I i z • - -. . - /' _ /� STORAGE YARD — �' / / �. ` \ 1 I I I 90' GORDON M. SIERi- m \—___ _ -- 'co iv I //� // (17 ACRES: SEE ?NOTE 2' •\\ _-' �'"�� / // I/ �� •\\\ / ,1 i ,/ // AND HELEN L SIERT /' _ �: I- IPH / / / / TRUST EASEAETiT L'i ,tQ '' / / r , \ \\---� J `\ 1 / /' /' I / / / (RECEPTION No. 2761129, /' I — _/ cit., ' / / / / / `\, _ • — \ 1 \ . / I a I I DATED 4/11/2000) • • • /IW • • • • m M - / / ; \ \ / \ g~g / i ./ /1 \\ \ \ iA-EXIST. ENCANA DEVORE / : YS / / , �.' / \\ \\ / / `� •• • 4i. / 33-34 WILL HEAD of W r _ \� / /. // / / /` / /wg/ /// �` ♦` --\ \ 1 �\`\\\\ .ills I i \ \ \ ---_./.___' / ' �� _ /' / ! \\ \` 11 11 1 11\11///r// / V l \ 3 is/ ...1-1E- -ap ----' /-- /'p/' / .r `\ 1 \ fJ / WATER QUAUTY - NO BUILD/STORAGE J--- 14 / cc __-- elite- / / I I I / I� AREA (VOLUME = 0.17 ACRE—FEET) i EXIST. ENTRANCE (ACCESS ��\- -- ' /--�'/'---/'� ,r- -`I _ �`--' �' /- I / -/ / // / '/ I ,,- ` - iii ` I PERMIT No. AP15-00082) f,�_ /� s _i / ..... ' _ _r\ L, I----- /- \ • /34-34 a IMOi�/ / 7�v \ Z -. Jy�(/) , -1------_____i (it\ < \ \-,..•4.0-1,/' �i� "19y C'tQ,� / / '•\ '\ II /' F I I NON CO►IPRE$5Og \ • 3 }�i j '/ a_ete44744%,4'ia / / \ I I Pe---(APPROX. 9.25 ACRES Li \fir 431P7. ST • O 11 _ i 1 I / I t \ 1 / a `• / / I i• / / N I�� a ist I I EXIST. ABANDONED SINGLE `—\\ /�. / �`� 11 i' / 1 I I I ` `•-. �% i�' I STORY RESIDENCE AND 1 j--,./--; / i i i i ' ♦ . VARIOUS OUT BUILDINGS , \ / / / I I I 1 \ F^� _ I cro0 N �� _II\ i J / / 1 I EXIST. ACCESS ORNE ,,'r•/ 1 \\ ._.-._ ' _. -._.-� �. •: __I I o y �/ —. . /� // / i ( \ v BARD - ��— I 'I I �.-- \\ !'` / I / I% / / \\ ` \ • •\ `.�' (APPROX. 0.14 ACRES) T .. �,`.r..it. .L _ 4-. — I 8 /-. \ / / / I , 1 1 _I \\ L--� L- ,- ► ��.i1 - _ ____ , \ .. / • „ 4 i / / / I . A . / , , , „ I \ 11 I w --...:=:-. \'y I I I 1 'L'/ / i i / EXIST. ENCIINA EXIST. UNDERGROUND i 8 // IDUSE I \ 1 6 r L`\ '=w\\ \`\ 1 �' / / // SEPARATORS PIPELINES (TYP.) 8 z ,/ .' :7— A{ZATORS / \\ 11 EXIST. OVERHEAD Z �T ,\ 1 -1 / / / / / W jg Z / u11Y1, Y,LJ -, \ a. - /\ .`>� 1 1 ,, ./ %I EXIST. ENCANA TANK ��yi 13 i / EXIST. ENCANA.T/WK COUNTY SECTKNN LINE ( ` 1/� i i %/ ��5 I I r BATTERY FAClf11 ,,' O a '/ Cri ` / / \ I __/ , _ / J J &TIERY FACIIILIY; i SECRON LINE n z i 30' R.O.W. FOR \ I I 1 I / 1 _v -- ' I I CV Iv / f o y. \ , t EXIST. ENCANA DEVORE r o \ r 3-34 WELL HEAD c- I / / / N Z COUNTY ROAD 26 /• J11 / / I I\ I / ``� v •.•-� , 1 I// / / - ��/ ,/ /1 // / / / I ♦ /• \ I 1 I / / 0\0 (BOOK 86/PAGE 273) / I .T _I I / ``- // / ,' •' ! / 1` •' r I I I / N F / / / I t_ / EMT ENCMIA DEVORE i \ I / o �, I // `♦ I- I ♦ ` \/' ' ,' /' / 1 43-34 WELL HEAD 1 I 111 / /7 IO \CC / I o \ 1 \ I l - _\ `\ `\ / / , I EXIST. ENCANA DEVORE / / i / I \ / /'' U I I , 11 \ \\ 1 ` ��\ \\ \\ rl r/(/ //'/J // ,/ / 6^4 34 WELL HEAD 1 �` ; I 1 / I- /I/ 1 \ \ _ ` \ •\ I o / / / / 1 . V \ / N / / 1 1 \ ./ \ \ \ / / /' /' W n \ ! \ , \ I I 2Q' FUTURE OYEPfEAD, J \ /' G'i m \\ 75 MIME PIPELINE ROW ELECTRIC ROW 1 I 11 II i \�`� —'I -- ``i \ \i \I i i z n g i uM LID PD. I (RECEPTION No. TBD, // c I ' 11 I i I 1 I - L. 1 v ''� /' i i I i j I 11 a o N i WED TBD) 1v v ;DRIED TBD). 1 1 `o EXIST. DOSS DENIM t \\ -- `\ I / / 1 I / I I I a I 1 z z a I lI \ / <ZIE I v 1 6-8-34 .11' - vv •' •` vv '`;�� i 1 I I / i i I 1i o zo / ,y9 vv I �`v� / s \� \ ♦ \ \ lII / 11 1 I I I I 1 I I it r K \ 1\ MT. ENGALMMORE-\ I I i 1 t E a I 1 I I \ 44-34 WF1L i v v I( , I A. I I , I J Fz We I 1 1 1 \ a. W \i \EXIST. DOUBLE SWING SITE GATE' —r /A I 24•-0' WIDE (MIN.) ACCESS DRIVE T 1_ n - — _ I I I \ , ? I TO REMAIN (APPROX. 85 FT.- _.�— _ _(GRAVEL SURFACED) $ o 11"' — I \ \ ,I \,' W _ I FROM EDGE OF COUNTY RD. 33) 1 N - V W n r �. I I V, I { \ \ EXIST. CATTLE GUARD TO BE RDAOVED �, o n — �'n'r— — — --I — 1 1 Z I NEW 16 SQ. FT. SELF-SUPPORTED AND REPLACE) W/ NEW DOUBLE \ Y _z> i� I I I I ` I I • COMPRESSOR SUTTON SKIN (6 FT.- CATRE GUARD (20 FT. TRAVEL WIDTH) / 1 \\ ; a I I j li I I - HIGH MAX.). LOCATED 20 FE. FROM I 1 WI o g to z 2 I I /•, LEGEND F I PARCEL BOUNDARY FROM COUNTY RD. R.O.W.) \ E EXIST. ENTRANCE TO BE IMPROVED (GRAVEL wm I I I I1Ij1 m \ . j - SURFACED; 60 FT. ACCESS RAN) (ACCESS z W CO 1 ' 8 I I I `. DOSTING CONTOUR oo I I— `lie `�-r — —PERM' No. AP14-14-00511)-- o•1 r OD `3 i _ % _ < y �� ` �" i` �`� u — _ --IF GAS SDNG UNDERGROUND �i W' — U S r-- T UNE I _` - _ z ROOD �- T_ I fi E SI NG OVERHEAD ., PROPOSED CONTOUR ELECTRIC !1 COUNTY SECTION LTTE — — — — — — — — I- 0 0 PROPOSED ACCESS DRIVE L g z U O W GRAPHIC SCALE: it 80 0 40 80 160 320 it z OVERALL SITE PLAN ( IN FEET ) g < SCALE 1. = 1601-0' 1 inch = 160 ft 1 Er O y 17 N REFERENCE DRAWINGS REVISIONS 1.NOTES: DUSTING BACKGROUND/SURVEY DATA IS BASED ON THE FOLLOWING: HORIZONTAL DATUM IS BASED CANNON COMPRESSOR STATION ON COLORADO STATE PLANE NORTH, NAD 83, US FEET AND WAS ESTABLISHED BY O.P.U.S. GPSiti OBSERVATIONS IN ACCORDANCE WITH WE NATgNAL GEODETIC SURVEYS SPECIFICATIONS FOR AnadarlictiOVERALL SITE PLAN g O.P.U.S. OBSERVATIONS; VERTICAL DATUM IS BIASED ON NAVD 88. RE-ISSUED FOR PERMIT SPe z/4/1s �" i/4ps USE BY SPECIAL REVIEW - USR14-0079 U 2. STORAGE YARD WILL NOT BE GRADED OR GRAVELED. �e Ra1 RE-ISSUE[) FOR PERMIT f/Is s ,nsrs DRAWN BY: SPB CREATION DATE 10/23/14 AFE No.: 2096379 WE Petroleum Corporation ISSUED FOR PERMIT �e 11 4 4 11 4 4 APPROVED: - APPR. DATE -j ISSUED FOR CLIENT REMEW sPe n/11/14 `�" 11tIp4 DWG. No.: C� �+ SLEET No. DWG. NO. 1111.E NO. DESCRP11ON 9Y DAE DATE APPR DAE CH2M H I LL 6'�°'°°d �i SCALE AS NOTED 15-CAN N-CJ-4 02 2 OF 3 / D \ l / 2a' FUTURE OVERHEAD GRID NORTH 1 /• ELECTRIC ROW (RECEPTION No. TBD, T DATED 1T3D) - \ % A. 11 : \ J I \ \ N. N il / V \ \ // / 49� NEW 6'-0- DRAINAGE CHANNEL N N \ N N. N. \ / WALKWAY OVER (TYP. FOR 4) \ N N I / — — ( I I i / / I N \ \\\ �� '�s000 rI -- T \ \ \\ o / 1 f / \ ._.; ---_ • S fN NN N o I / \ � / ` \ \ ` Zoo % WATER QUALITY - NO BUID/STORAGE f _ \�_/!_._._.-: _. —•—•—•—• —., \ \ \ �y Z AREA (VOLUME — 0.17 ACRE—FEET) —.—.— — — — \ \\ / 7..-- 24 24 24 soot ■ ' I \ \ � \/// \\m \ \ I / Y 25 T 25 1 25 A 1 �.: :' \\ r \ 1, � 11 ! 1yxj \ ' I / . . LIIG6M I E 'T. ENC.ANA ACCESS DRI�� \ Me / _— _— _ — _ __ — __ �I _ 7 EX�ISxT ENCANA TANK BATTERY N. FAY / / I 8 EXIST. ENCANA SEPARATORSTi\1/4 iliJ \ �_ M I \ \ \ CO / ST. UNDERGROUND \ \ 4998 a \ - - - _ / / ' ' I %ID o °- •-I S `§ J \ \ \ / / 6-4-34 WELL HEAD rc N \ E ill \ EXIST. ENCANA DEVORE � `'� '::=•�• • I , � 43-34 WE111fAD L D I II •Ii I \ \ i / I I 1 I r 'I� 1 ' ' Q.L. I \\ \ \\ \ \ / // 1 I ' � i (AT'PROX XXJO( ACRES) SITE SURFACE (AROUND STATION �+! EOUPMENi: GRAVEL SURFACED) �\ © PROPOSED EQUIPMENT INDEX _ — — — — \ \ \/ / I<� f u 11�� I SITE LK2TDNG (TYP. FOR 14) CONSTRUCTION < _ �/+ ■ ,■ 1'::•. HI ITEM No. ITEM DESCRIPTION QTY. N N / / I - ' f ' ! � ' I Ili:rr IIII L 24'-0- WIDE (MN.) ACCESS 1 PHASE § \ I Li�I 1 VENT RECEIVER 1 1 N g9 17 17 17 1�: ,1r �� DRNE (GRAVEL SURFACED) 2 3 ,' I Thai ( + 6'-0- HIGH MIN. CHAN-UNK 2 HP DIAPHRAGM PUMP 6 I 16 16 1 (MIN.) 3 ELECTRIC COMPRESSOR w/ COOLER rc \ _ rte, L� L•! •r� �_ C 1 `�33�i I J 1 2 I j1E FENCE 4 SLUG CATCHER 2 (1) IN PHASE 1) IN PHASE 3 1 r5 / I \ \ __ .-- is i I — .- I =_ _ _ _ • 1 I 1111111 18 I 5 METHANOL TANK 1 1 N. 7 FUEL GAS CONDITIONING SYSTEM 1 1 / I 0 * * * I n - n• 11 I I \ EXIST. FNCANA OEVORE 4497 ; 17 17 17 /� 10 .i'•11 1. •••.. .....- N.' \ 8 FUEL GAS METER ( ) 1 1 33-34 WELL HEAD �. .r,, • 9 INLET/DISCHARGE PIPING ON PIPERACKS q °� 1. I 1• �� 1 I 10 AIR RECEIVER 1 n o r S a / :!iii \ , \ 11 TEE SUPPORTS 1 F. LJ Lam] iii I \ \ 11 _ 12 ELECTRK AL SWITCHYARD 1 3 m ' • I _ � ' 0 I \ \ \ \ 14 60 MOTOR CO 13 AIR NTROL SOR CENTER 1 1 0 o �•■ (1) IN PHASE 1; m z 4998 ii : Li ' I \ 3 (2) IN PHASE 3 . ' 15 TRANSFORMER � � ` • �.� I � � � � \ (1) IN PHASE 1; o - I r' 2 (1) IN PHASE 3 \ I �b4 1 16 INLET SEPARATOR \ I I N. \ GAS COMPRESSOR W1 COOLER (FITTED w/ NOISE SUPPRESSION 3 IN PHASE 1; \ I I I \\ \ 17 PACKAGES-COOLER SLENCERS, MUFFLERS, AIR INTAKE 6 ( ) - - - -- --- - - - - -\ \ / \ \ 13 - \ \ SILENCERS, AND ATTENUATED BUILDINGS) (3) M PHASE 2 15 \ / °45 I N. \ 18 JUNCTION PPING(ON PIPE RACKS 1 a / — — — — — \ -4999 — I / —j I I \ \ - 19 GENERATOR ) 1 1 1 1 1 a\ \ I 14 34 I T I N. \ 20 CONTROL ROOM 1 1 J // \ \ \ I 20 i I I 1 I I I . 1 1 1 i _; 21 70' RADIO TOWER / _ N. \ 21 _ '14:0 I I \ 22 CONNECTING PIPE (ON PEE RACKS) 1 l FUTURE OVERHEAD (1) IN PHASE 1; / --`� \ \ � \ ` - - -N. ❑ ... ROW 3 1 IN PHASE 2; +/ / — '>. N / 12 u•.•- u�•r. V I ELECTRIC 23 GLYCOL REGEN SKID ( ) / / / -_ \ \ \' ,� I j No. TBD, (1) W PHASE 3 N. a ` � � / ' // / ....,- /-- \1 �� ® 15 • o I, DATED TBO) (1) IN PHASE 1;I.<o � � / // // / / / \ \ „ \ �\� � � \�- -5001- -- .�• / 1S I - I I 3 < / a// / / /// / ' .• / 19 i I 24 BTEX SKID 3 (1) IN PHASE 2; // // / / / / ." �.� .` j I I I I (1) IN PHASE 3 '-'-'.i (1) IN PHASE 1; O C\�� / / / / / �� .. � \ \ � I I 14 1 INPHASE2: o \\\\ \ / /% / % / % ` I ^ ` j '` `\` i •\ . / 25 VAPOR RECOVERY ( ) (2) IN PHASE 3 re I 36'-0- WIDE HEAVY DUTY —. _ (1) IN PHASE 1; 1., \\.`- ��j -'� SLIDE GATE . •`\_._._. _ ._......_. _- 1T._._. _. _. .-I L J 26 COALESCING SKID / +`' 3 (1) IN PHASE 2; 5000 (1) IN PHASE 3 z 1, -- ' -- 4'-0' MADE (MIN.) MAN GATE I� 4999-4999 �■ "=:" .aw \\ 27 3-PHASE SEPARATOR 1 3 (IYP. FOR 5) \ \ \- 28 BOOSTER PUMP SKID 1 1 o - 24'-0. WIDE (MN.) ACCESS \ 15002 I \ 29 TRIM COOLER 1 (1) IN PHASE 3 z -- DINE (GRAVEL SURFACED) - ' ' NQUAITTY AREA (EW GRASS DRAINAGEFCOWIlEC110N i \ \ 30 NOT USED b ' -- ' ' .-- / --- S- \ / 31 NOT USED ' / / TRENCH) AROUND ENTIRE INTERIOR // 32 LUBE OIL TANK 1 1 Z ' / \ SITE PERIMETER f / 33 GLYCOL TANK 2 1 N I / 34 POWER DISTRIBUTION CENTER 1 3 ' \ 1 NEW SITE PEPoMETER EIERM (3H:1� I \ / 35 GAS CHROMATOGRAPH 1 1 (TOP SOIL AND SEED, AS NECESSARY) 36 DISCHARGE SKID 1 1 i ' \ \\ 37 MEASUREMENT EQUIPMENT 1 1 6 I EXIST. UNDERGROUND PIPELINE LEGEND I-• s� D(ISTING CONTOUR PROPOSED CONTOUR � XI GRAPHIC SCALE t La 1 \ \ — _ EXISTING UNDERGROUND zs o +zs zs 50 100 // \ \ \ \\ GAS LNE PROPOSED SITE MIT / ENLARGED SITE PLAN \ EXISTING OVERHEAD ( �' ) i / SCALE 1" = 50'-0' \ ELECIPoC DRAINAGE FLOW ARROW Ll1./'— s inch = 50 ft 14 CANNON COMPRESSOR STATION Y o REVISIONS 1 i ma ;I REFERENCE DRAWINGS NOTES: III ENLARGED SITE PLAN RBH USE BY SPECIAL REVIEW - USR14-0079 �1 RE-ISSUED FOR PERMIT 2 4 5 2 4 5 , RE—ISSUED FOR PERMIT SPB +/'s/,s Rem '/15/15 Petroleum Corporation DRAWN SPB CREATION DATE 10/23/14 AFE No.: 2096379 y r9 __ APPROVED: — APPR. DATE :1 ISSUED FOR PERMIT S "/1+/14 "/14/14 A ISSUED FOR CLENT REVIEW II I 4 II I 4 DWG. No.: SHEET No. Err APPR. CH2MHILL °1 „2 SCAT AS NOTED 15-CANN-CS-4003 3 OF 3 DWG. NO. TITLE NO. DESCRIPTION DAT DATE DAT 9127 S.Jamaica Street East Building Englewood, Colorado 80112 CitePhone: 303-771-0900 S November 14, 2014 Weld County Department of Public Works Public Works Development Engineer 1111 H Street Greeley, Colorado 80631 Subject: Anadarko Petroleum Corporation's Proposed Cannon Compressor Station—Drainage Narrative To Whom It May Concern: The proposed compressor station site is located in Weld County, Colorado,approximately 4 miles Southeast of Platteville in the North 1/2 of the SE 1/4 of Section 34,Township 3 North, Range 66 West of the 6th Principal Meridian. The project entails the construction of a new compressor station that will be used to transport natural gas through pipelines. The developed site will encompass approximately 10 acres within the 161.4 acre platted parcel, numbered 121134000008, that is owned by Anadarko E&P Company, LP. This letter is intended to provide a summary of the site drainage plan for the proposed Cannon Compressor Station for the purpose of requesting a waiver from the Weld County Code requirement to provide stormwater detention. EXISTING SITE DESCRIPTION The site of the proposed compressor station is situated 2100 feet North of Weld County Road 26, and 1400 feet West of Weld County Road 33. The site consists of undeveloped rangeland. The remainder of the parcel is mostly undeveloped rangeland,with several natural gas wellheads and associated small diameter condensate tanks, and a vacant residence on the south border adjacent to Weld County Road 26. The concrete lined Spear Canal traverses the quarter section entering from the lower east side and exiting the upper west side. The areas surrounding the parcel also consist of undeveloped rangeland with oil and gas production facilities in all directions. The west side of the parcel, located south of the Spear Canal,generally slopes to the west at grades from 1%to 3%. The remainder of the parcel slopes downward from the South to the North at grades ranging from 1%to 3%. The existing site drainage at the location of the proposed compressor station flows to a shallow but large depression located northwest of the station site. Most drainage appears to then infiltrate into the soil. Larger runoffs sheetflow to the north onto another parcel consisting of undeveloped rangeland except for several natural gas wellheads and a condensate collection facility. The entire parcel where the compressor station site will be located is comprised of Valent sands based on the Soil Map determined from the Natural Resources Conservation Service Web Soil Survey. Valent sands belong to Hydrologic Soil Group A which have a low runoff potential when thoroughly wet. The site is not located within a FEMA designated 100 year floodplain, as per Flood Insurance Rate Map number 080266-0860-C. The existing parcel percentage impervious was calculated to be 2.8%. PUBLIC WORKS DEVELOPMENT ENGINEER PAGE 2 NOVEMBER 14, 2014 PROPOSED SITE DESCRIPTION The proposed compressor station site would include skidded buildings and equipment placed on concrete piers and foundations,gravel roads, and gravel finished working surfaces. The existing parcel drainage that presently drains onto the site, would be directed around the site using a proposed 1 foot high earthen berm that will be replanted with native grasses. The diverted drainage will follow the historical path to the existing depression noted above,where it will infiltrate into the soil. The onsite drainage would be directed outward from the center of the site to drainage channels located around the perimeter of the site. The channels will be sloped to a proposed Water Quality Capture Feature located on the northwest perimeter of the site. Runoff volumes in excess of the Water Quality Capture Feature capacity will exit through an overflow weir and will follow the historical drainage path. The drainage channels will be replanted with native grasses and protected with an erosion control blanket to allow for final stabilization. The parcel imperviousness, after the site development, along with existing site installations, will be 5.4%. WATER QUALITY CAPTURE FEATURE It is proposed that a Water Quality Capture Feature be provided, in lieu of a detention pond. The Water Quality Capture Feature will allow stormwater run-off from the developed site to be collected and settle out any contaminants. The Water Quality Capture Volume (WQCV) of the feature is calculated based on the Urban Storm Drainage Criteria Manual,Volume 3,Section 3.3, Equation 3-1. WQCV= a(0.91P-1.19/2 +0.781) Where: WQCV =Water Quality Capture Volume (watershed inches) a =Coefficient corresponding to WQCV drain time,from Table 3-2 of the reference = 1.0, conforms to a 40 hour drain time as required in the Weld County Engineering and Construction Criteria,Section 5.11.1 / =Composite Imperviousness of Site (%/100) The composite imperviousness of 0.35 for the compression station site was calculated based on the following data: LAND SURFACE CHARACTERISTICS IMPERVIOUS FACTOR TRIBUTARY (Note 1) CATCHMENT ACREAGE Roofs 0.90 0.61 Greenbelts, agricultural 0.02 2.19 Gravel (packed) 0.40 7.15 Concrete Foundations 1.00 0.05 TOTAL ACRES= 10.00 Note 1: Impervious factor from the Urban Storm Drainage Criteria Manual,Volume 1,Section 2.7,Table RO-3 Therefore,WQCV = 1.0[(0.91 x 0.353)-(1.19 x 0.352)+(0.78 x 0.35)] PUBLIC WORKS DEVELOPMENT ENGINEER PAGE 3 NOVEMBER 14, 2014 =0.166 watershed inches The required storage volume of the basin is then calculated as: V= WQCV(A). 12 Where: V= Required storage volume (acre-feet) A= Tributary catchment area upstream (acres) Therefore,V = (0.166 watershed inches((10.00 acres). 12 =0.14 acre-feet = 6098 cubic feet The proposed WQCV basin will provide a storage volume of 0.17 acre-feet,or 7317 cubic feet, at a maximum depth of 1 foot. The pond will infiltrate the soil in less than 40 hours. In the event of stormwater volumes in excess of the basin capacity, stormwater will overflow the basin and will sheet flow along the historic drainage path towards the northwest to the existing depression in the parcel, where it will also infiltrate the soil. Any overflow from the depression will continue to the north along the historic flow path. CONCLUSIONS Due to a total parcel imperviousness of only 5.4%, and no downstream impacts expected from the development of the compressor station site, a waiver of the Weld County Code requirement for stormwater detention is requested. A Water Quality Control Feature as indicated above, will be installed. We appreciate your consideration in this matter, and please feel free to contact me with any questions Sincerely, �pQPp0 RECjs % ....- P t vp �p5.He3g�, et� Ronald B. Heitland, P.E. ��{)'U4'�Ol 31579 ye;' Sr. Civil/Structural Engineer III ;a II‘ fr i ar (720)286-4543 ;� � • I ron.heitland@ch2m.com ! 9127 S.Jamaica Street East Building Englewood,Colorado 80112 CH2MH ILL® Phone: 303-771-0900 110.0 January 15, 2015 Weld County Department of Public Works Public Works Development Engineer 1111 H Street Greeley, Colorado 80631 Subject: Anadarko Petroleum Corporation's Proposed Cannon Compressor Station—Drainage Narrative (Revision 1) To Whom It May Concern: The proposed compressor station site is located in Weld County, Colorado, approximately 4 miles Southeast of Platteville in the North 1/2 of the SE 1/4 of Section 34,Township 3 North, Range 66 West of the 6th Principal Meridian. The project entails the construction of a new compressor station that will be used to transport natural gas through pipelines. The developed site will encompass approximately 9.4 acres within the 161.4 acre platted parcel, numbered 121134000008,that is owned by Anadarko E&P Company, LP. This letter is intended to provide a summary of the site drainage plan for the proposed Cannon Compressor Station for the purpose of requesting a waiver from the Weld County Code requirement to provide stormwater detention. EXISTING SITE DESCRIPTION The site of the proposed compressor station is situated 2100 feet North of Weld County Road 26, and 1400 feet West of Weld County Road 33. The site consists of undeveloped rangeland. The remainder of the parcel is mostly undeveloped rangeland,with several natural gas wellheads and associated small diameter condensate tanks, and a vacant residence on the south border adjacent to Weld County Road 26. The concrete lined Spear Canal traverses the quarter section entering from the lower east side and exiting the upper west side. The areas surrounding the parcel also consist of undeveloped rangeland with oil and gas production facilities in all directions. The west side of the parcel, located south of the Spear Canal,generally slopes to the west at grades from 1%to 3%. The remainder of the parcel slopes downward from the South to the North at grades ranging from 1%to 3%. The existing site drainage at the location of the proposed compressor station flows to a shallow but large depression located northwest of the station site. Most drainage appears to then infiltrate into the soil. Larger runoffs sheetflow to the north onto another parcel consisting of undeveloped rangeland except for several natural gas wellheads and a condensate collection facility. The entire parcel where the compressor station site will be located is comprised of Valent sands based on the Soil Map determined from the Natural Resources Conservation Service Web Soil Survey. Valent sands belong to Hydrologic Soil Group A which have a low runoff potential when thoroughly wet. The site is not located within a FEMA designated 100 year floodplain,as per Flood Insurance Rate Map number 080266-0860-C. The existing parcel percentage impervious was calculated to be 2.8%. PUBLIC WORKS DEVELOPMENT ENGINEER PAGE 2 JANUARY 15, 2015 PROPOSED SITE DESCRIPTION The proposed compressor station site would include skidded buildings and equipment placed on concrete piers and foundations, gravel roads, and gravel finished working surfaces. The existing parcel drainage that presently drains onto the site, would be directed around the site using a proposed 1 foot high earthen berm that will be replanted with native grasses. The diverted drainage will follow the historical path to the existing depression noted above, where it will infiltrate into the soil. The onsite drainage would be directed outward from the center of the site to drainage channels located around the perimeter of the site. The channels will be sloped to a proposed Water Quality Capture Feature located on the northwest perimeter of the site. Runoff volumes in excess of the Water Quality Capture Feature capacity will exit through an overflow weir and will follow the historical drainage path. The drainage channels will be replanted with native grasses and protected with an erosion control blanket to allow for final stabilization. The existing parcel gravel access road will be improved and lengthened to access the proposed compressor station. This will result in a negligible increase in runoff, which will not pass through the Water Quality Capture Feature, but will either pass through the existing site depression northwest of the compressor station, or an additional existing depression northeast of the compressor station. The capacity of both of these depressions is sufficient to hold the Water Quality Capture Volume that is in their tributary catchment area. The parcel imperviousness, after the site development, along with existing site installations, will be 5.2%. WATER QUALITY CAPTURE FEATURE It is proposed that a Water Quality Capture Feature be provided, in lieu of a detention pond. The Water Quality Capture Feature will allow stormwater run-off from the developed site to be collected and settle out any contaminants. The Water Quality Capture Volume (WQCV) of the feature is calculated based on the Urban Storm Drainage Criteria Manual, Volume 3, Section 3.3, Equation 3-1. WQCV= a(0.9113-1.1912+0.781) Where: WQCV = Water Quality Capture Volume (watershed inches) a = Coefficient corresponding to WQCV drain time, from Table 3-2 of the reference = 1.0, conforms to a 40 hour drain time as required in the Weld County Engineering and Construction Criteria, Section 5.11.1 / = Composite Imperviousness of Site (%/100) The composite imperviousness of 0.36 for the compression station site was calculated based on the following data: LAND SURFACE CHARACTERISTICS IMPERVIOUS FACTOR TRIBUTARY (Note 1) CATCHMENT ACREAGE Roofs 0.90 0.62 Greenbelts, agricultural 0.02 1.81 Gravel (packed) 0.40 6.95 Concrete Foundations _ 1.00 0.06 TOTAL ACRES= 9.44 PUBLIC WORKS DEVELOPMENT ENGINEER PAGE 3 JANUARY 15, 2O15 Note 1: Impervious factor from the Urban Storm Drainage Criteria Manual,Volume 1, Section 2.7,Table RO-3 Therefore,WQCV = 1.0[(0.91 x 0.363)-(1.19 x 0.362) + (0.78 x 0.36)] = 0.169 watershed inches The required storage volume of the basin is then calculated as: V= WQCV(A) 12 Where: V= Required storage volume (acre-feet) A= Tributary catchment area upstream (acres) Therefore,V = (0.169 watershed inches)(9.44 acres) 12 = 0.13 acre-feet = 5793 cubic feet The proposed WQCV basin will provide a storage volume of 0.17 acre-feet, or 7317 cubic feet, at a maximum depth of 1 foot. The pond will infiltrate the soil in less than 40 hours. In the event of stormwater volumes in excess of the basin capacity, stormwater will overflow the basin and will sheet flow along the historic drainage path towards the northwest to the existing depression in the parcel, where it will also infiltrate the soil. Any overflow from the depression will continue to the north along the historic flow path. CONCLUSIONS Due to a total parcel imperviousness of only 5.2%, and no downstream impacts expected from the development of the compressor station site, a waiver of the Weld County Code requirement for stormwater detention is requested. A Water Quality Control Feature as indicated above, will be installed. We appreciate your consideration in this matter, and please feel free to contact me with any questions Sincerely, �� RE09• ova B.VJ NEj Tom-,Ca AN / Ronald B. Heitland, P.E. % 31579 t i r Sr. Civil/Structural Engineer it r lr/C) �AL �'r�e(720)286-4543 o A ron.heitland@ch2m.com METHANOL Material Safety Data Sheet Instant FAME/Instant Anaerobe Methods { Methanol SECTION 1 -CHEMICAL PRODUCT AND COMPANY IDENTIFICATION MSDS Name:Methanol MSDS Preparation Date: 06/19/2009 Synonyms or Generic ID for Methanol: Carbinol;Methyl alcohol;Methyl hydroxide; Monohydroxymethane;Wood alcohol;Wood naptha;Wood spirits;Columbian spirits;Methanol. Chemical Family:Methanol Family Formula: CH3OH Molecular Weight:N/A PIN(UN#/NA#):UN1230 Company Identification: Microbial ID. 125 Sandy Drive Newark,DE 19713 For Information,call:(800)276-8068,(302)737-4297 For Domestic CHEMTREC assistance,call:800-424-9300 For International CHEMTREC assistance,call:703-527-3887 I SECTION 2—COMPOSITION,INFORMATION ON INGREDIENTS 67-56-1 Methanol <99% 200-659-6 Irritant, Flammable NFPA Rating:(estimated)Health: 1;Flammability:3;Instability:0 f State: Liquid Appearance:colorless Odor:Alcohol like,weak odor Boiling Point: pH:Not available Specific Gravity: 64.7°C@760►mmHg 7910g/cm3@20°C Vapor Pressure(mm Hg): 128mm1-Ig @20°C Vapor Density(AIR.-1): 1.11 Flash Point: 12°C Solubility in Water:miscible I SECTION 3-HAZARDS IDENTIFICATION Appearance: Colorless liquid,Flash Point: 12°C,53.6°F. Danger! Poison!May be fatal or cause blindness if swallowed.Vapor harmful.Flammable liquid and vapor.Harmful if swallowed,inhaled,or absorbed through the skin. Causes eye,skin,and respiratory tract irritation.May cause central nervous system depression. Cannot be made non-poisonous. Target Organs: Eyes,nervous system,optic nerve. Potential Health Effects Eye:May cause painful sensitization to light.Methanol is a mild to moderate eye irritant.Inhalation, ingestion or skin absorption of methanol can cause significant disturbance in vision,including blindness. Skin:Causes moderate skin irritation.May be absorbed through the skin in harmful amounts.Prolonged and or repeated contact may cause defatting of skin and dermatitis.Methanol can be absorbed through the skin,producing systemic effects that include visual disturbances. Ingestion: May be fatal or cause blindness if swallowed.Aspiration hazard.Cannot be made non- poisonous.May cause gastrointestinal irritation with nausea,vomiting and diarrhea.May cause systematic toxicity with acidosis.May cause central nervous system depression,characterized by excitement,followed by headache,dizziness,drowsiness,and nausea.Advanced stages may cause collapse,unconsciousness, coma,and possible death due to failed respiratory failure.May cause cardiopulmonary system effects. Microbial ID Chemicals 1 MSDS Potassium Hydroxide Solution Material Safety Data Sheet Instant FAME/Instant Anaerobe Methods ' Methanol Inhalation: Methanol is toxic and can very readily form extremely high vapor concentrations at room temperature. Inhalation is the most common route of occupational exposure.At first,methanol causes CNS depression with nausea,headache,vomiting,dizziness and incoordination.A time period with no obvious symptoms follows(typically 8-24 hrs).This latent period is followed by metabolic acidosis and severe visual effects which may include reduced reactivity and/or increased sensitivity to light,blurred,doubl and/or snowy vision,and blindness.Depending on the severity of exposure and the promptness of treatment,survivors may recover completely or may have permanent blindness,vision disturbances and/or nervous system effects. Chronic:Prolonged or repeated skin contact may cause dermatitis.Chronic exposure may cause effects similar to those of acute exposure.Methanol is only very slowly eliminated from the body.Because of this slow elimination,methanol should be regarded as a cumulative poison.Though a single exposure may cause no effect,daily exposures may result in the accumulation of a harmful amount.Methanol has produced fetotoxicity in rats and teratogenicity in mice exposed by inhalation to high concentrations that did not produce significant material toxicity. SECTION 4-FIRST AID MEASURES Eyes: In case of contact,immediately flush eyes with plenty of water for a t least 15 minutes.Get medical aid. Skin:In case of contact,inunediately flush skin with plenty of water for at least 15 minutes while removing contaminated clothing and shoes.Get medical aid immediately.Wash clothing before reuse. Ingestion: Potential for aspiration if swallowed.Get medical aid immediately.Do not induce vomiting unless directed to do so by medical personnel.Never give anything by mouth to an unconscious person.If vomiting occurs naturally,have victim lean forward. Inhalation: If inhaled,remove to fresh air.If not breathing,give artificial respiration.If breathing is difficult,give oxygen.Get medical aid. Notes to Physician: Effects may be delayed. Antidote: Ethanol may inhibit methanol metabolism. I SECTION 5—FIRE FIGHTING MEASURES General Information:Ethanol may inhibit methanol metabolism.As in any fire,wear a self-contained _ breathing apparatus in pressure-demand,MSHA/NIOSH(approved or equivalent),and full protective gear. During a fire,irritating and highly toxic gases may be generated by thermal decomposition or combustion. Use water spray to keep fire-exposed containers cool.Water may be ineffective.Material is lighter than water and a fire may be spread by the use of water.Vapors are heavier than air and may travel to a source of ignition and flash back.Vapors can spread along the ground and collect in low or confined areas. Extinguishing Media:For small fires,use dry chemical,carbon dioxide,water spray or alcohol-resistant foam.Water may be ineffective.For large fires,use water spray,fog or alcohol-resistant foam.Do NOT use straight streams of water. Flash Point: 12 deg C(53.60 deg F) Autoignition Temperature: 455 deg C(851.00 deg F) Explosion Limits,Lower:6.0 vol% . Upper: 31.00 vol% NFPA Rating:(estimated)Health: 1;Flanunability: 3;Instability:0 SECTION 6-ACCIDENTAL RELEASE MEASURES General Information:Use proper personal protective equipment as indicated in Section 8. Spills/Leaks:Use water spray to disperse the gas/vapor.Remove all sources of ignition.Absorb spill using an absorbent,non-combustible material such as earth,sand,or vermiculite.Do not use combustible materials such as sawdust.Use a spark-proof tool.Provide ventilation.A vapor suppressing foam may be used to reduce vapors.Water spray may reduce vapor but may not prevent ignition in closed spaces. Microbial ID Chemicals 2 MSDS Potassium Hydroxide Solution Material Safety Data Sheet Instant FAME/Instant Anaerobe Methods Methanol SECTION 7-HANDLING AND STORAGE Handling:Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Ground and bond containers when transferring material.Use spark-proof tools and explosion proof equipment. Avoid contact with eyes,skin,and clothing.Empty containers retain product residue,(liquid and/or vapor), and can be dangerous.Keep container tightly closed.Do not ingest or inhale.Do not pressurize,cut,weld, braze,solder,drill,grind,or expose empty containers to heat,sparks or open flames.Use only with adequate ventilation.Keep away from heat,sparks and flame.Avoid use in confined spaces. Storage: Keep away from heat,sparks,and flame.Keep away from sources of ignition.Store in a cool, thy,well-ventilated area away from incompatible substances.Flammables-area.Keep containers tightly closed. I SECTION 8-EXPOSURE CONTROL/PERSONAL PROTECTION Engineering Controls:Use explosion-proof ventilation equipment.Facilities storing or utilizing this material should be equipped with an eyewash facility and a safety shower.Use adequate general or local exhaust ventilation to keep airborne concentrations below the permissible exposure limits. Chemical Name ACGIH NIOSH OSHA—Final PELs Methanol 200 ppm TWA;250 200 ppm TWA;260 200 ppm TWA;260 ppm STEL;Skin- mg/m3 TWA 6000 ppm mg/m3 TWA potential significant IDLH contribution to overall exposure by the cutaneous route OSHA Vacated PELs:Methanol:200 ppm TWA;260 mg/m3 TWA Personal Protective Equipment Eyes: Wear chemical splash goggles. Skin:Wear butyl rubber gloves,apron,and/or clothing. Clothing:Wear appropriate protective clothing to prevent skin exposure. Respirators:Follow the OSHA respirator regulations found in 29 CFR 1910.134 or European Standard EN 149.Use a NIOSH/MSHA or European Standard EN 149 approved respirator if exposure limits are exceeded or if irritation or other symptoms are experienced. SECTION 9--PHYSICAL AND CHEMICAL PROPERTIES Physical State: Clear liquid Appearance: clear,colorless-APHA: 10 max Odor:alcohol-like-weak odor pH:Not available. Vapor Pressure: 128 mm Hg @ 20 deg C Vapor Density: 1.11 (Air=-1) Evaporation Rate:5.2(Ether=l) Viscosity:0,55 cP 20 deg C Boiling Point:64.7 deg C @ 760 mmHg Freezing/Melting Point:-98 deg C Decomposition Temperature:Not available. Solubility:miscible Specific Gravity/Density:.7910 g/cm3 @ 20°C Molecular Formula:CH4O Molecular Weight:32.04 Microbial ID Chemicals 3 MSDS Potassium Hydroxide Solution Material Safety Data Sheet Instant FAME/Instant Anaerobe Methods '- • Methanol SECTON 10-STABILITY AND REACTIVITY Chemical Stability: Stable under normal temperatures and pressures. Conditions to Avoid:High temperatures,ignition sources,confined spaces. Incompatibilities with Other Materials: Oxidizing agents,reducing agents,acids,alkali metals, • potassium,sodium,metals as powders(e.g.hafnium,raney nickel),acid anhydrides,acid chlorides, powdered aluminum,powdered magnesium. Hazardous Decomposition Products: Carbon monoxide,irritating and toxic fumes and gases,carbon dioxide, formaldehyde. Hazardous Polymerization:Will not occur. SECTION 11 -TOXICOLOGICAL INFORMATION RTECS#: CAS#67-56-1: PC1400000 LD50/LC50: CAS#67-56-1: Draize test,rabbit,eye:40 mg Moderate; Draize test,rabbit,eye: 100 mg/24H Moderate; Draize test,rabbit,skin:20 mg/24H Moderate; Inhalation,rabbit: LC50=81000 mg/m3/14H; Inhalation,rat:LC50=64000 ppm/4H; Oral,mouse:LD50=7300 ing/kg; Oral,rabbit: LD50= 14200 mg/kg; Oral,rat:LD50=5600 mg/kg; Skin,rabbit:LD50= 15800 mg/kg; Human LDLo Oral: 143 mg/kg;Human LDLo Oral:428 mg/kg;Human TCLo Inhalation;300 ppm caused visual field changes&headache;Monkey LDLo Skin:393 mg/kg.Methanol is significantly less toxic to most experimental animals than humans,because most animal species metabolize methanol differently. Non-primate species do not ordinarily show symptoms of metabolic acidosis or the visual effects which have been observed in primates and humans. Carcinogenicity: CAS#67-56-1:Not listed by ACGIH,IARC,NTP,or CA Prop 65. Epidemiology:No information found Teratogenicity:There is no human information available.Methanol is considered to be a potential developmental hazard based on animal data.In animal experiments,methanol has caused fetotoxic or teratogenic effects without maternal toxicity. Reproductive Effects: See actual entry in RTECS for complete information. Mutagenicity:See actual entry in RTECS for complete information. Neurotoxicity:ACGIH cites neuropathy,vision and CNS under TLV basis. I SECTION 12-ECOLOGICAL INFORMATION Ecotoxicity: Fish:Fathead Minnow:29.4 g/L;96 Hr;LC50(unspecified)Fish:Goldfish:250 ppm; 11 Hr; resulted in deathFish:Rainbow trout:800O mg/L;48 Hr;LC50(unspecified)Fish:Rainbow trout: LC50= 13-68 mg/L;96 Hr.; 12 degrees CFish:Fathead Minnow:LC50=29400 mg/L;96 Hr.;25 degrees C,pH 7.63Fish: Rainbow trout: LC50=8000 mg/L;48 Hr.;UnspecifiedBacteria:Phytobacterium phosphoreum: EC50=51,000-320,000 mg/L;30 minutes;Microtox test No data available. Environmental:Dangerous to aquatic life in high concentrations.Aquatic toxicity rating:TLm 96>1000 ppm.May be dangerous if it enters water intakes.Methyl alcohol is expected to biodegrade in soil and water very rapidly.This product will show high soil mobility and will be degraded from the ambient atmosphere by the reaction with photochemically produced hyroxyl radicals with an estimated half-life of 17.8 days.Bioconcentration factor for fish(golden ide)< 10.Based on a log Kow of-0.77,the BCF value for methanol can be estimated to be 0.2. Physical:No information available. Other:No information available. Microbial ID Chemicals 4 MSDS Potassium Hydroxide Solution Material Safety Data Sheet Instant FAME/Instant Anaerobe Methods Methanol SECTION 13-DISPOSAL CONSIDERATIONS Chemical waste generators must determine whether a discarded chemical is classified as a hazardous waste. US EPA guidelines for the classification determination are listed in 40 CFR Parts 261.3.Additionally, waste generators must consult state and local hazardous waste regulations to ensure complete and accurate classification. • RCRA P-Series:None listed. RCRA U-Series: CAS#67-56-1:waste number U154(Ignitable waste). SECTION 14-TRANSPORT INFORMATION US DOT CANADA TDG Shipping Name: Methanol Methanol Hazard Class: 3 3 UN Number: UN1230 UN1230 Packing Group: II II Additional Information Flash Point 12°C I SECTION 15-REGULATORY INFORMATION J US FEDERAL TSCA CAS#67-56-1 is listed on the TSCA inventory. Health&Safety Reporting List { None of the chemicals are on the Health&Safety Reporting List. Chemical Test Rules None of the chemicals in this product are under a Chemical Test Rule. Section 12b None of the chemicals are listed under TSCA Section 12b. TSCA Significant New Use Rule None of the chemicals in this material have a SNUR under TSCA. CERCLA Hazardous Substances and corresponding RQs CAS#67-56-1: 5000 lb final RQ;2270 kg final RQ SARA Section 302 Extremely Hazardous Substances None of the chemicals in this product have a TPQ. SARA Codes CAS#67-56-1:immediate,fire. Section 313 This material contains Methanol(CAS#67-56-1,>99%),which is subject to the reporting requirements of Section 313 of SARA Title III and 40 CFR Part 373. Clean Air Act: CAS#67-56-1 is listed as a hazardous air pollutant(HAP). This material does not contain any Class 1 Ozone depletors. This material does not contain any Class 2 Ozone depletors. Clean Water Act: None of the chemicals in this product are listed as Hazardous Substances under the CWA. None of the chemicals in this product are listed as Priority Pollutants under the CWA. None of the chemicals in this product are listed as Toxic Pollutants under the CWA. OSHA: None of the chemicals in this product are considered highly hazardous by OSHA. STATE CAS#67-56-1 can be found on the following state right to know lists:California,New Jersey, { Pennsylvania,Minnesota,Massachusetts. Microbial ID Chemicals 5 MSDS Potassium Hydroxide Solution Material Safety Data Sheet Instant FAME/Instant Anaerobe Methods Methanol California Prop 65 California No Significant Risk Level:None of the chemicals in this product are listed. European/International Regulations European Labeling in Accordance with EC Directives Hazard Symbols: TF Risk Phrases: R 11 Highly flammable. R 23/24/25 Toxic by inhalation,in contact with skin and if swallowed. R 39/23/24/25 Toxic:danger of very serious irreversible effects through inhalation,in contact with skin and if swallowed. Safety Phrases: S 16 Keep away from sources of ignition-No smoking. S 36/37 Wear suitable protective clothing and gloves. S 45 In case of accident or if you feel unwell,seek medical advice immediately(show the label where possible). S 7 Keep container tightly closed. WGK(Water Danger/Protection) CAS#67-56-1: 1 Canada-DSL/NDSL CAS#67-56-1 is listed on Canada's DSL List. Canada-WHMIS This product has a WHMIS classification of B2,DIB,D2B. This product has been classified in accordance with the hazard criteria of the Controlled Products Regulations and the MSDS contains all of the information required by those regulations. Canadian Ingredient Disclosure List CAS#67-56-1 is listed on the Canadian Ingredient Disclosure List. I SECTION 16—Other Information This Material Safety Data Sheet has been prepared in accordance with 29 CFR 1910.1200 and contains information believed to be accurate and complete at the date of preparation.The statements contained herein are offered for informational purposes only and are based upon technical data.MIDI Inc.believes them to be accurate but does not purport to be all-inclusive.The above-stated product is intended for use only by persons having the necessary technical skills and facilities for handling the product at their discretion and risk.Since conditions and manner of use are outside our control,we(MIDI Inc.)make no warranty of merchantability or any such warranty,express or implied with respect to.information and we assume no liability resulting from the above product or its use.Users should make their own investigations to determine suitability of information and product for their particular purposes. Microbial ID Chemicals 6 MSDS Potassium Hydroxide Solution Cat NGEC (Natural Gas Engine Coolant) Premix 50/50 Material Safety Data Sheet SECTION 1 PRODUCT AND COMPANY IDENTIFICATION Cat® NGECTM (Natural Gas Engine Coolant) Premix 50/50 Product Use: Antifreeze/Coolant Product Number(s): CPS227813 Company Identification ChevronTexaco Global Lubricants 6001 Bollinger Canyon Road San Ramon, CA 94583 United States of America Transportation Emergency Response CHEMTREC: (800)424-9300 or (703) 527-3887 Health Emergency ChevronTexaco Emergency Information Center: Located in the USA. International collect calls accepted. (800) 231-0623 or(510) 231-0623 Product Information email : lubemsds@chevron.com Product Information: 800-LUBE-TEK MSDS Requests: 800-414-6737 SECTION 2 COMPOSITION/INFORMATION ON INGREDIENTS COMPONENTS CAS NUMBER AMOUNT Water 7732-18-5 45-60 %weight Ethylene Glycol 107-21-1 40 -55 %weight Diethylene glycol 111-46-6 1 -5 %weight SECTION:3 HAZARDS IDENTIFICATION ************************************************************************************************************************ EMERGENCY OVERVIEW -HARMFUL OR FATAL IF SWALLOWED -CAUSES EYE IRRITATION -POSSIBLE BIRTH DEFECT HAZARD - CONTAINS MATERIAL THAT MAY CAUSE BIRTH DEFECTS BASED ON ANIMAL DATA -MAY CAUSE DAMAGE TO: - KIDNEY ************************************************************************************************************************ IMMEDIATE HEALTH EFFECTS Revision Number:0 of Cat®NGECTM(Natural Gas Engine Revision Date: 02/10/2003 Coolant)Premix 50/50 MSDS: 11116 Eye: Contact with the eyes causes irritation. Symptoms may include pain, tearing, reddening, swelling and impaired vision. Skin: Contact with the skin is not expected to cause prolonged or significant irritation. Not expected to be harmful to internal organs if absorbed through the skin. Ingestion: Toxic; may be harmful or fatal if swallowed. Inhalation: The vapor or fumes from this material may cause respiratory irritation. Symptoms of respiratory irritation may include coughing and difficulty breathing. Breathing this material at concentrations above the recommended exposure limits may cause central nervous system effects. Central nervous system effects may include headache, dizziness, nausea, vomiting, weakness, loss of coordination, blurred vision, drowsiness, confusion, or disorientation. At extreme exposures, central nervous system effects may include respiratory depression, tremors or convulsions, loss of consciousness, coma or death. DELAYED OR OTHER HEALTH EFFECTS: Reproduction and Birth Defects: Contains material that may be harmful to the developing fetus based on animal data. Target Organs: Contains material that may cause damage to the following organ(s) following repeated ingestion based on animal data: Kidney See Section 11 for additional information. Risk depends on duration and level of exposure. SECTION 4 FIRST AID MEASURES I Eye:Flush eyes with water immediately while holding the eyelids open. Remove contact lenses, if worn, { after initial flushing, and continue flushing for at least 15 minutes. Get medical attention if irritation persists. Skin: To remove the material from skin, use soap and water. Discard contaminated clothing and shoes or thoroughly clean before reuse. Ingestion: If swallowed, get immediate medical attention. Do not induce vomiting. Never give anything by mouth to an unconscious person. Inhalation: Move the exposed person to fresh air. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical attention if breathing difficulties continue. SECTION 5 FIRE FIGHTING MEASURES FIRE CLASSIFICATION: OSHA Classification (29 CFR 1910.1200): Not classified by OSHA as flammable or combustible. NFPA RATINGS: Health: 2 Flammability: 0 Reactivity: 0 FLAMMABLE PROPERTIES: Flashpoint: NA Autoignition: NDA Flammability (Explosive) Limits (% by volume in air): Lower: NA Upper: NA EXTINGUISHING MEDIA: Dry Chemical, CO2, AFFF Foam or alcohol resistant foam. PROTECTION OF FIRE FIGHTERS: Fire Fighting Instructions: For fires involving this material, do not enter any enclosed or confined fire space without proper protective equipment, including sell`contained breathing apparatus. Combustion Products: Highly dependent on combustion conditions. A complex mixture of airborne Revision Number: 0 of Cat®NGEC'""(Natural Gas Engine Revision Date: 02/10/2003 Coolant)Premix 50/50 MSDS: 11116 solids, liquids, and gases including carbon monoxide, carbon dioxide, and unidentified organic compounds will be evolved when this material undergoes combustion. Combustion may form oxides of: Sodium . SECTION 6 ACCIDENTAL RELEASE MEASURES Spill Management: Stop the source of the release if you can do it without risk. Contain release to prevent further contamination of soil, surface water or groundwater. Clean up spill as soon as possible, observing precautions in Exposure Controls/Personal Protection. Use appropriate techniques such as applying non-combustible absorbent materials or pumping. Where feasible and appropriate, remove contaminated soil. Place contaminated materials in disposable containers and dispose of in a manner consistent with applicable regulations. Reporting: Report spills to local authorities and/or the U.S. Coast Guard's National Response Center at (800)424-8802 as appropriate or required. SECTION 7 HANDLING AND STORAGE Precautionary Measures: Wash thoroughly after handling. Do not taste or swallow. Do not breathe vapor or fumes. Do not get in eyes. General Handling Information: Do not taste or swallow antifreeze or solution. Keep out of the reach of children and animals. General Storage Information: Do not store in open or unlabeled containers. Container Warnings: Container is not designed to contain pressure. Do not use pressure to empty container or it may rupture with explosive force. Empty containers retain product residue (solid, liquid, and/or vapor) and can be dangerous. Do not pressurize, cut, weld, braze, solder, drill, grind, or expose such containers to heat, flame, sparks, static electricity, or other sources of ignition. They may explode { and cause injury or death. Empty containers should be completely drained, properly closed, and promptly returned to a drum reconditioner or disposed of properly. SECTION 8. EXPOSURE CONTROLS/PERSONAL PROTECTION GENERAL CONSIDERATIONS: Consider the potential hazards of this material (see Section 3), applicable exposure limits, job activities, and other substances in the work place when designing engineering controls and selecting personal protective equipment. If engineering controls or work practices are not adequate to prevent exposure to harmful levels of this material, the personal protective equipment listed below is recommended. The user should read and understand all instructions and limitations supplied with the equipment since protection is usually provided for a limited time or under certain circumstances. ENGINEERING CONTROLS: Use process enclosures, local exhaust ventilation, or other engineering controls to control airborne levels below the recommended exposure limits. PERSONAL PROTECTIVE EQUIPMENT Eye/Face Protection: Wear protective equipment to prevent eye contact. Selection of protective equipment may include safety glasses, chemical goggles, face shields, or a combination depending on the work operations conducted. Skin Protection: No special protective clothing is normally required. Where splashing is possible, select protective clothing depending on operations conducted, physical requirements and other substances in the workplace. Suggested materials for protective gloves include: Natural rubber, Neoprene, Nitrile Rubber, Polyvinyl Chloride (PVC or Vinyl). Respiratory Protection: Determine if airborne concentrations are below the recommended exposure limits. If not, wear an approved respirator that provides adequate protection from measured concentrations of this material, such as: Air-Purifying Respirator for Organic Vapors, Dusts and Mists. ) Revision Number:0 of Cat®NGECTM(Natural Gas Engine Revision Date: 02/1O/2003 Coolant)Premix 50/50 MSDS: 11116 Use a positive pressure air-supplying respirator in circumstances where air-purifying respirators may not provide adequate protection. Occupational Exposure Limits: Component Limit TWA STEL Ceiling Notation Ethylene Glycol ACGIH 39.4 ppm (weight) Ethylene Glycol ACGIH_TLV 100 mg/m3 Ethylene Glycol OSHA PEL 125 mg/m3 SECTION 9 PHYSICAL AND CHEMICAL PROPERTIES Attention: the data below are typical values and do not constitute a specification. Color: Purple Physical State: Liquid Odor: Faint or Mild pH: 10 - 11 Vapor Pressure: 0.12 mmHg (Typical) @ 20 °C Vapor Density (Air= 1): 2.1 Boiling Point: 228 °F (109 C) Solubility: Miscible Freezing Point: -34 °F (-37 C) Specific Gravity: 1.13 @ 15.6 °C / 15.6 °C Viscosity: 8 cSt @ 40 °C Evaporation Rate: NDA SECTION.10 STABILITY AND REACTIVITY Chemical Stability: This material is considered stable under normal ambient and anticipated storage and handling conditions of temperature and pressure. Incompatibility With Other Materials: May react with strong oxidizing agents, such as chlorates, nitrates, peroxides, etc. Hazardous Decomposition Products: Aldehydes (Elevated temperatures) Hazardous Polymerization: Hazardous polymerization will not occur. SECTION 11 TOXICOLOGICAL INFORMATION IMMEDIATE HEALTH EFFECTS Eye Irritation: The eye irritation hazard is based on evaluation of data for similar materials or product components. Skin Irritation: The skin irritation hazard is based on evaluation of data for similar materials or product components. Skin Sensitization: No product toxicology data available. Acute Dermal Toxicity: The acute dermal toxicity hazard is based on evaluation of data for similar materials or product components. Acute Oral Toxicity: The acute oral toxicity hazard is based on evaluation of data for similar materials or product components. Acute Inhalation Toxicity: The acute inhalation toxicity hazard is based on evaluation of data for similar materials or product components. J Revision Number: 0 of Cat®NGECTU(Natural Gas Engine Revision Date: 02/10/2003 Coolant)Premix 50/50 MSDS: 11116 ADDITIONAL TOXICOLOGY INFORMATION: This product contains ethylene glycol (EG). The toxicity of EG via inhalation or skin contact is expected to be slight at room temperature. The estimated oral lethal dose is about 100 cc (3.3 oz.) for an adult human. Ethylene glycol is oxidized to oxalic acid which results in the deposition of calcium oxalate crystals mainly in the brain and kidneys. Early signs and symptoms of EG poisoning may resemble those of alcohol intoxication. Later, the victim may experience nausea, vomiting, weakness, abdominal and muscle pain, difficulty in breathing and decreased urine output. When EG was heated above the boiling point of water, vapors formed which reportedly caused unconsciousness, increased lymphocyte count, and a rapid, jerky movement of the eyes in persons chronically exposed. When EG was administered orally to pregnant rats and mice, there was an increase in fetal deaths and birth defects. Some of these effects occurred at doses that had no toxic effects on the mothers. We are not aware of any reports that EG causes reproductive toxicity in human beings. This product contains diethylene glycol (DEG). The estimated oral lethal dose is about 50 cc (1.6 oz) for an adult human. DEG has caused the following effects in laboratory animals: liver abnormalities, kidney damage and blood abnormalities. It has been suggested as a cause of the following effects in humans: liver abnormalities, kidney damage, lung damage and central nervous system damage. SECTION 12 ECOLOGICAL INFORMATION ECOTOXICITY The toxicity of this material to aquatic organisms has not been evaluated. Consequently, this material should be kept out of sewage and drainage systems and all bodies of water. ENVIRONMENTAL FATE This material is expected to be readily biodegradable. SECTION 13 DISPOSAL CONSIDERATIONS Use material for its intended purpose or recycle if possible. This material, if it must be discarded, may meet the criteria of a hazardous waste as defined by US EPA under RCRA (40 CFR 261) or other State and local regulations. Measurement of certain physical properties and analysis for regulated components may be necessary to make a correct determination. If this material is classified as a hazardous waste, federal law requires disposal at a licensed hazardous waste disposal facility. SECTION 14 TRANSPORT INFORMATION The description shown may not apply to all shipping situations. Consult 49CFR, or appropriate Dangerous Goods Regulations, for additional description requirements (e.g., technical name) and mode- specific or quantity-specific shipping requirements. DOT Shipping Name: NOT REGULATED AS A HAZARDOUS MATERIAL FOR TRANSPORTATION UNDER 49 CFR DOT Hazard Class: NOT APPLICABLE DOT Identification Number: NOT APPLICABLE DOT Packing Group: NOT APPLICABLE Additional Information: Bulk shipments with a reportable quantity(5000 pounds) of ethylene glycol are a hazardous material. The Proper Shipping Name is: Environmentally Hazardous Substance, Liquid, N.O.S. (ethylene glycol), 9, UN3082, III, RQ (ethylene glycol). IMO/IMDG Shipping Name: NOT REGULATED AS DANGEROUS GOODS FOR TRANSPORTATION J Revision Number:0 of Cat®NGECTM(Natural Gas Engine Revision Date:02/10/2003 Coolant)Premix 50/50 MSDS: 11116 UNDER THE IMDG CODE IMO/IMDG Hazard Class: NOT APPLICABLE IMO/IMDG Identification Number: NOT APPLICABLE IMO/IMDG Packing Group:NOT APPLICABLE SECTION 15 REGULATORY INFORMATION SARA 311/312 CATEGORIES: 1. immediate (Acute) Health Effects: YES 2. Delayed (Chronic) Health Effects: YES 3. Fire Hazard: NO 4. Sudden Release of Pressure Hazard: NO 5. Reactivity Hazard: NO REGULATORY LISTS SEARCHED: 4_I1=IARC Group 1 15=SARA Section 313 4_I2A=IARC Group 2A 16=CA Proposition 65 4_128=IARC Group 2B 17=MA RTK 05=NTP Carcinogen 18=NJ RTK 06=OSHA Carcinogen 19=DOT Marine Pollutant 09=TSCA 12(b) 20=PA RTK The following components of this material are found on the regulatory lists indicated. Ethylene Glycol 15, 17, 18, 20 CERCLA REPORTABLE QUANTITIES(RQ)/SARA 302 THRESHOLD PLANNING QUANTITIES(TPQ): Component Component RQ Component TPQ Product RQ Ethylene Glycol 5000 lbs None 10477 lbs CHEMICAL INVENTORIES: AUSTRALIA: This material contains components that require notification before sale or importation into Australia. CANADA: All the components of this material are on the Canadian DSL or have been notified under the New Substance Notification Regulations, but have not yet been published in the Canada Gazette. EUROPEAN UNION: All the components of this material are in compliance with the EU Seventh Amendment Directive 92/32/EEC. JAPAN: This material contains components that require notification before sale or importation into Japan. KOREA:This material contains components that require notification before sale or importation into Korea. PHILIPPINES: All the components of this product are listed on the Philippine Inventory of Chemicals and Chemical Substances (PICCS). UNITED STATES: All of the components of this material are on the Toxic Substances Control Act (TSCA) Chemical Inventory. NEW JERSEY RTK CLASSIFICATION: Refer to components listed in Section 2. WHMIS CLASSIFICATION: Class D, Division 1, Subdivision B: Toxic Material - Acute Lethality Class D, Division 2, Subdivision A: Very Toxic Material - Teratogenicity and Embryotoxicity 1 Revision Number:0 of Cat@ NGECTM' (Natural Gas Engine Revision Date:02/10/2003 Coolant)Premix 50/50 MSDS: 11116 • . Class D, Division 2, Subdivision B: Toxic Material - Chronic Toxic Effects Skin or Eye Irritation SECTION 16 OTHER INFORMATION NFPA RATINGS: Health: 2 Flammability: 0 Reactivity: 0 HMIS RATINGS: Health: 2* Flammability: 0 Reactivity: 0 (0-Least, 1-Slight, 2-Moderate, 3-High, 4-Extreme, PPE:- Personal Protection Equipment Index recommendation, "-Chronic Effect Indicator). These values are obtained using the guidelines or published evaluations prepared by the National Fire Protection Association (NFPA) or the National Paint and Coating Association (for HMIS ratings). REVISION STATEMENT: This is a new Material Safety Data Sheet. ABBREVIATIONS THAT MAY HAVE BEEN USED IN THIS DOCUMENT: TLV - Threshold Limit Value TWA - Time Weighted Average STEL - Short-term Exposure Limit PEL - Permissible Exposure Limit CAS - Chemical Abstract Service Number NDA - No Data Available NA - Not Applicable - Less Than or Equal To >_ - Greater Than or Equal To Prepared according to the OSHA Hazard Communication Standard (29 CFR 1910.1200) and the ANSI MSDS Standard (Z400.1) by the ChevronTexaco Energy Research &Technology Company, 100 Chevron Way, Richmond, California 94802. The above information is based on the data of which we are aware and is believed to be correct as of the date hereof. Since this information may be applied under conditions beyond our control and with which we may be unfamiliar and since data made available subsequent to the date hereof may suggest modifications of the information, we do not assume any responsibility for the results of its use. This information is furnished upon condition that the person receiving it shall make his own determination of the suitability of the material for his particular purpose. { J Revision Number:0 of Cat®NGECTM(Natural Gas Engine Revision Date:02/10/2003 Coolant)Premix 50/50 MSDS: 11116 E&onMobil Product Name: MOBIL PEGASUS 805 Revision Date: 26Sep2008 Page 1 of 8 MATERIAL SAFETY DATA SHEET SECTION 1 PRODUCT AND COMPANY IDENTIFICATION PRODUCT Product Name: MOBIL PEGASUS 805 Product Description: Base Oil and Additives Product Code: 602466-00, 97D936 Intended Use: Natural gas engine oil COMPANY IDENTIFICATION Supplier: EXXON MOBIL CORPORATION 3225 GALLOWS RD. FAIRFAX, VA. 22037 USA 24 Hour Health Emergency 609-737-4411 Transportation Emergency Phone 800-424-9300 ExxonMobil Transportation No. 281-834-3296 Product Technical Information 800-662-4525, 800-947-9147 MSDS Internet Address http://www.exxon.com, http://www.mobil.com SECTION 2 COMPOSITION / INFORMATION ON INGREDIENTS Reportable Hazardous Substance(s) or Complex Substance(s) Name CAS# Concentration* BENZENE PROPANOIC ACID, 125643-61-0 1 -5% 3,5-BIS(1,1-DIMETHYLETHYL)-4-HYDROXY-,C7-9 BRANCHED ALKYL ESTERS *All concentrations are percent by weight unless material is a gas. Gas concentrations are in percent by volume. SECTION 3 HAZARDS IDENTIFICATION This material is not considered to be hazardous according to regulatory guidelines (see (M)SDS Section 15). POTENTIAL HEALTH EFFECTS Low order of toxicity. Excessive exposure may result in eye, skin, or respiratory irritation. High-pressure injection under skin may cause serious damage. NFPA Hazard ID: Health: 0 Flammability: 1 Reactivity: 0 HMIS Hazard ID: Health: 0 Flammability: 1 Reactivity: 0 NOTE: This material should not be used for any other purpose than the intended use in Section 1 without expert advice. Health studies have shown that chemical exposure may cause potential human health risks which may vary from person to person. SECTION 4 FIRST AID MEASURES E&onMobil Product Name: MOBIL PEGASUS 805 Revision Date: 26Sep2008 Page 2 of 8 INHALATION Remove from further exposure. For those providing assistance, avoid exposure to yourself or others. Use adequate respiratory protection. If respiratory irritation, dizziness, nausea, or unconsciousness occurs, seek immediate medical assistance. If breathing has stopped, assist ventilation with a mechanical device or use mouth-to-mouth resuscitation. SKIN CONTACT Wash contact areas with soap and water. If product is injected into or under the skin, or into any part of the body, regardless of the appearance of the wound or its size, the individual should be evaluated immediately by a physician as a surgical emergency. Even though initial symptoms from high pressure injection may be minimal or absent, early surgical treatment within the first few hours may significantly reduce the ultimate extent of injury. EYE CONTACT Flush thoroughly with water. If irritation occurs, get medical assistance. INGESTION First aid is normally not required. Seek medical attention if discomfort occurs. SECTION 5 FIRE FIGHTING MEASURES EXTINGUISHING MEDIA Appropriate Extinguishing Media: Use water fog, foam, dry chemical or carbon dioxide (CO2)to extinguish flames. Inappropriate Extinguishing Media: Straight Streams of Water FIRE FIGHTING Fire Fighting Instructions: Evacuate area. Prevent runoff from fire control or dilution from entering streams, sewers, or drinking water supply. Firefighters should use standard protective equipment and in enclosed spaces, self-contained breathing apparatus (SCBA). Use water spray to cool fire exposed surfaces and to protect personnel. Hazardous Combustion Products: Oxides of carbon, Sulfur oxides, Aldehydes, Smoke, Fume, Incomplete combustion products FLAMMABILITY PROPERTIES Flash Point [Method]: >2450 (473F) [ASTM D-92] Flammable Limits (Approximate volume % in air): LEL: 0.9 UEL: 7.0 Autoignition Temperature: N/D SECTION 6 ACCIDENTAL RELEASE MEASURES NOTIFICATION PROCEDURES In the event of a spill or accidental release, notify relevant authorities in accordance with all applicable regulations. US regulations require reporting releases of this material to the environment which exceed the E&onMobil Product Name: MOBIL PEGASUS 805 Revision Date: 26Sep2008 Page 3 of 8 applicable reportable quantity or oil spills which could reach any waterway including intermittent dry creeks. The National Response Center can be reached at (800)424-8802. SPILL MANAGEMENT Land Spill: Stop leak if you can do it without risk. Recover by pumping or with suitable absorbent. Water Spill: Stop leak if you can do it without risk. Confine the spill immediately with booms. Warn other shipping. Remove from the surface by skimming or with suitable absorbents. Seek the advice of a specialist before using dispersants. Water spill and land spill recommendations are based on the most likely spill scenario for this material; however, geographic conditions, wind, temperature, (and in the case of a water spill)wave and current direction and speed may greatly influence the appropriate action to be taken. For this reason, local experts should be consulted. Note: Local regulations may prescribe or limit action to be taken. ENVIRONMENTAL PRECAUTIONS Large Spills: Dike far ahead of liquid spill for later recovery and disposal. Prevent entry into waterways, sewers, basements or confined areas. SECTION 7 HANDLING AND STORAGE HANDLING Prevent small spills and leakage to avoid slip hazard. Static Accumulator: This material is a static accumulator. STORAGE Do not store in open or unlabelled containers. SECTION 8 EXPOSURE CONTROLS/ PERSONAL PROTECTION Exposure limits/standards for materials that can be formed when handling this product: When mists/aerosols can occur, the following are recommended: 5 mg/m3 -ACGIH TLV, 10 mg/m3 -ACGIH STEL, 5 mg/m3- OSHA PEL. NOTE: Limits/standards shown for guidance only. Follow applicable regulations. ENGINEERING CONTROLS The level of protection and types of controls necessary will vary depending upon potential exposure conditions. Control measures to consider: No special requirements under ordinary conditions of use and with adequate ventilation. PERSONAL PROTECTION Personal protective equipment selections vary based on potential exposure conditions such as applications, E&onMobil Product Name: MOBIL PEGASUS 805 Revision Date: 26Sep2008 Page 4 of 8 handling practices, concentration and ventilation. Information on the selection of protective equipment for use with this material, as provided below, is based upon intended, normal usage. Respiratory Protection: If engineering controls do not maintain airborne contaminant concentrations at a level which is adequate to protect worker health, an approved respirator may be appropriate. Respirator selection, use, and maintenance must be in accordance with regulatory requirements, if applicable. Types of respirators to be considered for this material include: No special requirements under ordinary conditions of use and with adequate ventilation. For high airborne concentrations, use an approved supplied-air respirator, operated in positive pressure mode. Supplied air respirators with an escape bottle may be appropriate when oxygen levels are inadequate, gas/vapor warning properties are poor, or if air purifying filter capacity/rating may be exceeded. Hand Protection: Any specific glove information provided is based on published literature and glove manufacturer data. Glove suitability and breakthrough time will differ depending on the specific use conditions. Contact the glove manufacturer for specific advice on glove selection and breakthrough times for your use conditions. Inspect and replace worn or damaged gloves. The types of gloves to be considered for this material include: No protection is ordinarily required under normal conditions of use. Eye Protection: If contact is likely, safety glasses with side shields are recommended. Skin and Body Protection: Any specific clothing information provided is based on published literature or manufacturer data. The types of clothing to be considered for this material include: No skin protection is ordinarily required under normal conditions of use. In accordance with good industrial hygiene practices, precautions should be taken to avoid skin contact. Specific Hygiene Measures: Always observe good personal hygiene measures, such as washing after handling the material and before eating, drinking, and/or smoking. Routinely wash work clothing and protective equipment to remove contaminants. Discard contaminated clothing and footwear that cannot be cleaned. Practice good housekeeping. ENVIRONMENTAL CONTROLS See Sections 6, 7, 12, 13. SECTION 9 PHYSICAL AND CHEMICAL PROPERTIES Typical physical and chemical properties are given below. Consult the Supplier in Section 1 for additional data. GENERAL INFORMATION Physical State: Liquid Color: Amber Odor: Characteristic Odor Threshold: N/D IMPORTANT HEALTH, SAFETY, AND ENVIRONMENTAL INFORMATION Relative Density(at 15 C ): 0.89 Flash Point [Method]: >245C (473F) [ASTM D-92] Flammable Limits (Approximate volume % in air): LEL: 0.9 UEL: 7.0 Autoignition Temperature: N/D E&onMobil Product Name: MOBIL PEGASUS 805 Revision Date: 26Sep2008 Page 5 of 8 Boiling Point/ Range: >288C (550F) Vapor Density (Air= 1): > 2 at 101 kPa Vapor Pressure: < 0.013 kPa (0.1 mm Hg)at 20 C Evaporation Rate (n-butyl acetate = 1): N/D pH: N/A Log Pow (n-Octanol/Water Partition Coefficient): > 3.5 Solubility in Water: Negligible Viscosity: 130 cSt (130 mm2/sec) at 40 C I 13.5 cSt (13.5 mm2/sec)at 100C Oxidizing Properties: See Sections 3, 15, 16. OTHER INFORMATION Freezing Point: N/D Melting Point: N/A Pour Point: -12°C (10°F) DMSO Extract(mineral oil only), IP-346: < 3 %wt SECTION 10 STABILITY AND REACTIVITY STABILITY: Material is stable under normal conditions. CONDITIONS TO AVOID: Excessive heat. High energy sources of ignition. MATERIALS TO AVOID: Strong oxidizers HAZARDOUS DECOMPOSITION PRODUCTS: Material does not decompose at ambient temperatures. HAZARDOUS POLYMERIZATION: Will not occur. SECTION 11 TOXICOLOGICAL INFORMATION ACUTE TOXICITY Route of Exposure Conclusion / Remarks Inhalation Toxicity(Rat): LC50> 5000 mg/m3 Minimally Toxic. Based on test data for structurally similar materials. Irritation: No end point data. Negligible hazard at ambient/normal handling temperatures. Based on assessment of the components. Ingestion Toxicity(Rat): LD50> 5000 mg/kg Minimally Toxic. Based on test data for structurally similar materials. Skin Toxicity(Rabbit): LD50> 5000 mg/kg Minimally Toxic. Based on test data for structurally similar materials. Irritation (Rabbit): Data available. Negligible irritation to skin at ambient temperatures. Based on test data for structurally similar materials. Eye Irritation (Rabbit): Data available. May cause mild, short-lasting discomfort to eyes. Based on test data for structurally similar materials. CHRONIC/OTHER EFFECTS E&onMobil Product Name: MOBIL PEGASUS 805 Revision Date: 26Sep2008 Page 6 of 8 For the product itself: Sensitization: No adverse effects were observed. The study was conducted on structurally-similar material. Contains: Base oil severely refined: Not carcinogenic in animal studies. Representative material passes IP-346, Modified Ames test, and/or other screening tests. Dermal and inhalation studies showed minimal effects; lung non-specific infiltration of immune cells, oil deposition and minimal granuloma formation. Not sensitizing in test animals. Additional information is available by request. The following ingredients are cited on the lists below: None. --REGULATORY LISTS SEARCHED-- 1 = NTP CARC 3 = IARC 1 5 = IARC 2B 2 = NTP SUS 4 = IARC 2A 6 = OSHA CARC SECTION 12 ECOLOGICAL INFORMATION The information given is based on data available for the material, the components of the material, and similar materials. ECOTOXICITY Material -- Not expected to be harmful to aquatic organisms. MOBILITY Base oil component-- Low solubility and floats and is expected to migrate from water to the land. Expected to partition to sediment and wastewater solids. PERSISTENCE AND DEGRADABILITY Biodegradation: Base oil component-- Expected to be inherently biodegradable BIOACCUMULATION POTENTIAL Base oil component-- Has the potential to bioaccumulate, however metabolism or physical properties may reduce the bioconcentration or limit bioavailability. SECTION 13 DISPOSAL CONSIDERATIONS Disposal recommendations based on material as supplied. Disposal must be in accordance with current applicable laws and regulations, and material characteristics at time of disposal. DISPOSAL RECOMMENDATIONS Product is suitable for burning in an enclosed controlled burner for fuel value or disposal by supervised incineration at very high temperatures to prevent formation of undesirable combustion products. REGULATORY DISPOSAL INFORMATION E&onMobil Product Name: MOBIL PEGASUS 805 Revision Date: 26Sep2008 Page 7 of 8 RCRA Information: The unused product, in our opinion, is not specifically listed by the EPA as a hazardous waste (40 CFR, Part 261 D), nor is it formulated to contain materials which are listed as hazardous wastes. It does not exhibit the hazardous characteristics of ignitability, corrositivity or reactivity and is not formulated with contaminants as determined by the Toxicity Characteristic Leaching Procedure (TCLP). However, used product may be regulated. Empty Container Warning Empty Container Warning (where applicable): Empty containers may contain residue and can be dangerous. Do not attempt to refill or clean containers without proper instructions. Empty drums should be completely drained and safely stored until appropriately reconditioned or disposed. Empty containers should be taken for recycling, recovery, or disposal through suitably qualified or licensed contractor and in accordance with governmental regulations. DO NOT PRESSURISE, CUT, WELD, BRAZE, SOLDER, DRILL, GRIND, OR EXPOSE SUCH CONTAINERS TO HEAT, FLAME, SPARKS, STATIC ELECTRICITY, OR OTHER SOURCES OF IGNITION. THEY MAY EXPLODE AND CAUSE INJURY OR DEATH. SECTION 14 TRANSPORT INFORMATION LAND (DOT) : Not Regulated for Land Transport LAND (TDG) : Not Regulated for Land Transport SEA(IMDG) : Not Regulated for Sea Transport according to IMDG-Code AIR (IATA) : Not Regulated for Air Transport SECTION 15 REGULATORY INFORMATION OSHA HAZARD COMMUNICATION STANDARD: When used for its intended purposes, this material is not classified as hazardous in accordance with OSHA 29 CFR 1910.1200. NATIONAL CHEMICAL INVENTORY LISTING: AICS, IECSC, DSL, ENCS, KECI, PICCS, TSCA Special Cases: Inventory Status ELINCS Restrictions Apply EPCRA: This material contains no extremely hazardous substances. SARA(311/312) REPORTABLE HAZARD CATEGORIES: None. SARA(313) TOXIC RELEASE INVENTORY: This material contains no chemicals subject to the supplier notification requirements of the SARA 313 Toxic Release Program. The Following Ingredients are Cited on the Lists Below: Chemical Name CAS Number List Citations DIPHENYLAMINE 122-39-4 5 E&onMobil Product Name: MOBIL PEGASUS 805 Revision Date: 26Sep2008 Page 8 of 8 --REGULATORY LISTS SEARCHED-- 1 =ACGIH ALL 6 =TSCA 5a2 11 = CA P65 REPRO 16 = MN RTK 2 =ACGIH Al 7 =TSCA 5e 12 = CA RTK 17 = NJ RTK 3 =ACGIH A2 8 =TSCA6 13 = ILRTK 18 = PARTK 4 = OSHA Z 9 =TSCA 12b 14 = LA RTK 19 = RI RTK 5 =TSCA 4 10 = CA P65 CARC 15 = MI 293 Code key: CARC=Carcinogen; REPRO=Reproductive SECTION 16 OTHER INFORMATION N/D = Not determined, N/A= Not applicable THIS SAFETY DATA SHEET CONTAINS THE FOLLOWING REVISIONS: No revision information is available. The information and recommendations contained herein are, to the best of ExxonMobil's knowledge and belief, accurate and reliable as of the date issued. You can contact ExxonMobil to insure that this document is the most current available from ExxonMobil. The information and recommendations are offered for the user's consideration and examination. It is the user's responsibility to satisfy itself that the product is suitable for the intended use. If buyer repackages this product, it is the user's responsibility to insure proper health, safety and other necessary information is included with and/or on the container. Appropriate warnings and safe-handling procedures should be provided to handlers and users. Alteration of this document is strictly prohibited. Except to the extent required by law, re-publication or retransmission of this document, in whole or in part, is not permitted. The term, "ExxonMobil" is used for convenience, and may include any one or more of ExxonMobil Chemical Company, Exxon Mobil Corporation, or any affiliates in which they directly or indirectly hold any interest. Internal Use Only MHC: 0B, 0B, 0, 0, 0, 0 PPEC: A DGN: 2007675XUS (1015410) Copyright 2002 Exxon Mobil Corporation, All rights reserved Triethylene Glycol TRIETHYLENE GLYCOL Page 1 of 4 Common Name TRIETHYLENE GLYCOL ( Manufactured by COASTAL CHEMICAL CAS Number 112-27-6 Revised 08/08/1996 Source Dolphin (DOL.222760) 1. Chemical Product and Company Identification 2. Composition and Information on Ingredients 3. Hazards Identification 4. First Aid Measures 5. Fire and Explosion Data 6. Accidental Release Measures 7. Handling and Storage 8. Exposure Controls/personal Protection 9. Physical and Chemical Properties 10. Stability and Reactivity Data 11. Toxicological Information 12. Ecological Information 13. Disposal Considerations 14. Transport Information 15. Regulatory Information 16. Other Information MATERIAL SAFETY DATA SHEET 1 �. SECTION 1 . CHEMICAL PRODUCT AND COMPANY IDENTIFICATION COMMON NAME: TRIETHYLENE GLYCOL SUPPLIER: COASTAL CHEMICAL CO., L.L.C. 3520 VETERANS MEMORIAL DRIVE ABBEVILLE, LA 70510 318-893-3862 SYNONYM: NOT AVAILABLE. TRADE NAME: NOT AVAILABLE. MATERIAL USES: NOT AVAILABLE. CODE: 93101 MSDS# NOT AVAILABLE. VALIDATION DATE: 08/08/1996 PRINT DATE: 09/01/1999 IN CASE OF EMERGENCY: TRANSPORTATION EMERGENCY CALL CHEMTREC 800-424-9300 ! OTHER INFORMATION CALL ( JOE HUDMAN \. 713-477-6675 .../smweb.dll?Command&A 1=Browse&A2=115292&A3=chemq&A4=29&A 5-8&A6=19&A'4/15/2002 "METHYLENE GLYCOL Page 2 of 4 MANUFACTURER: VARIOUS ) SECTION 3 . HAZARDS IDENTIFICATION EMERGENCY OVERVIEW: CAUTION! MAY CAUSE EYE IRRITATION. MAY CAUSE SKIN IRRITATION. ROUTES OF ENTRY: EYE CONTACT. INGESTION. SKIN CONTACT. INHALATION. POTENTIAL ACUTE HEALTH EFFECTS: SLIGHT DANGEROUS TO DANGEROUS IN CASE OF SKIN CONTACT(IRRITANT, PERMEATOR), OF EYE CONTACT (IRRITANT) , OF INGESTION, OF INHALATION. THIS PRODUCT MAY IRRITATE EYES AND SKIN UPON CONTACT. POTENTIAL CHRONIC HEALTH EFFECTS: CARCINOGENIC EFFECTS. NOT AVAILABLE. MUTAGENIC EFFECTS: NOT AVAILABLE TERATOGENIC EFFECTS: NOT AVAILABLE. THE SUBSTANCE IS TOXIC TO BLOOD, KIDNEYS, LIVER. TOXICITY OF THE PRODUCT TO THE REPRODUCTIVE SYSTEM: NOT AVAILABLE. REPEATED OR PROLONGED EXPOSURE TO THE SUBSTANCE CAN PRODUCE TARGET ORGANS DAMAGE. SECTION 4 . FIRST AID MEASURES EYE CONTACT: CHECK FOR AND REMOVE ANY CONTACT LENSES. IMMEDIATELY FLUSH EYES WITH RUNNING WATER FOR AT LEAST 15 MINUTES, KEEPING EYELIDS OPEN. COLD WATER MAY BE USED. DO NOT USE AN EYE OINTMENT. SEEK MEDICAL ATTENTION. SKIN CONTACT: IF THE CHEMICAL GOT ONTO THE CLOTHED PORTION OF THE BODY, REMOVE THE CONTAMINATED CLOTHES AS QUICKLY AS POSSIBLE, PROTECTING YOUR OWN HANDS AND BODY. PLACE THE VICTIM UNDER A DELUGE SHOWER. IF THE CHEMICAL TOUCHES THE VICTIM'S EXPOSED SKIN, SUCH AS THE HANDS: GENTLY AND THOROUGHLY WASH THE CONTAMINATED SKIN WITH RUNNING WATER AND NON-ABRASIVE SOAP. BE PARTICULARLY CAREFUL TO CLEAN FOLDS, CREVICES, CREASES AND GROIN. COLD WATER MAY BE USED. COVER THE IRRITATED SKIN WITH AN EMOLLIENT. IF IRRITATION PERSISTS, SEEK MEDICAL ATTENTION. WASH CONTAMINATED CLOTHING BEFORE REUSING. HAZARDOUS SKIN CONTACT: WASH WITH A DISINFECTANT SOAP AND COVER THE CONTAMINATED SKIN WITH AN ANTI- BACTERIAL CREAM. SEEK MEDICAL ATTENTION. INHALATION: ALLOW THE VICTIM TO REST IN A WELL VENTILATED AREA. SEEK IMMEDIATE MEDICAL ATTENTION. HAZARDOUS INHALATION: NO ADDITIONAL INFORMATION. ) INGESTION: DO NOT INDUCE VOMITING. HAVE CONSCIOUS PERSON DRINK SEVERAL GLASSES OF WATER OR .../smweb.dll?Command&A 1=Browse&A2=115292&A3=chemq&A4=29&A5=8&A6=19&A4/15/2002 TRIETHYLENE GLYCOL Page 3 of 4 MILK. SEEK IMMEDIATE MEDICAL ATTENTION. HAZARDOUS INGESTION: DO NOT INDUCE VOMITING. EXAMINE THE LIPS AND MOUTH TO ASCERTAIN WHETHER THE TISSUES ARE DAMAGED, A POSSIBLE INDICATION THAT THE TOXIC MATERIAL WAS INGESTED; THE ABSENCE OF SUCH SIGNS, HOWEVER, IS NOT CONCLUSIVE. LOOSEN TIGHT CLOTHING SUCH AS A COLLAR, TIE, BELT OR WAISTBAND. IF THE VICTIM IS NOT BREATHING, PERFORM MOUTH-TO-MOUTH RESUSCITATION. SEEK MEDICAL ATTENTION. SECTION 5 . FIRE AND EXPLOSION DATA FLAMMABILITY OF THE PRODUCT: COMBUSTIBLE. AUTO-IGNITION TEMPERATURE: THE LOWEST KNOWN VALUE IS 227.78 DEG. C (442 DEG. F) (DIETHYLENE GLYCOL) . FLASH POINTS: THE LOWEST KNOWN VALUE IS CLOSED CUP: 138 DEG. C (280.4 DEG. F) OPEN CUP: 143 DEG. C (280.4 DEG. F) (CLEVELAND) (DIETHYLENE GLYCOL) FLAMMABLE LIMITS: THE GREATEST KNOWN RANGE IS LOWER: 2% UPPER: 12.3% (DIETHYLENE GLYCOL) PRODUCTS OF COMBUSTION: THESE PRODUCTS ARE CARBON OXIDES (CO, CO2) . FIRE HAZARDS IN PRESENCE OF VARIOUS SUBSTANCES: VERY SLIGHTLY TO SLIGHTLY FLAMMABLE IN PRESENCE OF OPEN FLAMES AND SPARKS, OF HEAT. EXPLOSION HAZARDS IN PRESENCE OF VARIOUS SUBSTANCES: RISKS OF EXPLOSION OF THE PRODUCT IN PRESENCE OF MECHANICAL IMPACT: NOT AVAILABLE. RISKS OF EXPLOSION OF THE PRODUCT IN PRESENCE OF STATIC DISCHARGE: NOT AVAILABLE. NO SPECIFIC INFORMATION IS AVAILABLE IN OUR DATABASE REGARDING THE PRODUCT'S RISKS OF EXPLOSION IN THE PRESENCE OF VARIOUS MATERIALS. FIRE FIGHTING MEDIA AND INSTRUCTIONS: SMALL FIRE: USE DRY CHEMICALS, CO2, WATER SPRAY OR FOAM. LARGE FIRE: USE WATER SPRAY, FOG OR FOAM. DO NOT USE WATER JET. SPECIAL REMARKS ON FIRE HAZARDS: WHEN HEATED TO DECOMPOSITION, IT EMITS ACRID SMOKE AND IRRITATING FUMES. (DIETHYLENE GLYCOL) SPECIAL REMARKS ON EXPLOSION HAZARDS: NO ADDITIONAL REMARK. SECTION 9` PHYSICAL AND CHEMICAL PROPERTIES PHYSICAL STATE AND APPEARANCE: LIQUID. ) MOLECULAR WEIGHT: NOT APPLICABLE. .../smweb.dl l?Command&A 1=Browse&A2=115292&A3=chemq&A4-29&A5=8&A6=19&A 4/15/2002 TRIETHYLENE GLYCOL Page 4 of 4 pH(1% SOLN/WATER) : NEUTRAL. BOILING POINT: THE LOWEST KNOWN VALUE IS 245.8 DEC. C (474.4 DEC. F) (DIETHYLENE GLYCOL) . / '� WEIGHTED AVERAGE: 284 .02 DEG. C (543.2 DEG. F) MELTING POINT: MAY START TO SOLIDIFY AT -5 DEG. C (23 DEG. F) BASED ON DATA FOR: TRIETHYLENE GLYCOL. WEIGHTED AVERAGE: -5.09 DEG. C (22.8 DEG. F) CRITICAL TEMPERATURE: NOT AVAILABLE. SPECIFIC GRAVITY: WEIGHTED AVERAGE: 1.12 (WATER = 1) VAPOR PRESSURE: THE HIGHEST KNOWN VALUE IS 0.01 MM OF HG (@20 DEG. C) (DIETHYLENE GLYCOL) . VAPOR DENSITY: THE HIGHEST KNOWN VALUE IS 6.7 (AIR=1) (TETRAETHYLENE GLYCOL) . WEIGHTED AVERAGE: 6.7 (AIR=1) VOLATILITY: NOT AVAILABLE. ODOR THRESHOLD: NOT AVAILABLE. EVAPORATION RATE: NOT AVAILABLE. VISCOSITY: NOT AVAILABLE. WATER/OIL DIST. COEFF. : NOT AVAILABLE. TONICITY (IN WATER) : NOT AVAILABLE. DISPERSION PROPERTIES: SEE SOLUBILITY IN WATER, METHANOL, DIETHYL ETHER. SOLUBILITY: EASILY SOLUBLE IN COLD WATER, HOT WATER, METHANOL, DIETHYL ETHER. PHYSICAL CHEMICAL COMMENTS: NOT AVAILABLE. ODOR: NOT AVAILABLE TASTE: NOT AVAILABLE. COLOR: NOT AVAILABLE .../smweb.dll?Command&A 1=Browse&A2=115292&A3=chemq&A4=29&A5=8&A6=19&A4/15/2002 .4? C0% Weld County Public Works Dept. t -4 1111 H Street ACCESS PERMIT K0 P.O. Box 758 mat -O* Greeley, CO 80632 APPLICATION FORM /C NJO Phone: (970)304-6496 Fax: (970)304-6497 Applicant Property Owner ( If different than Applicant) Name: Kelsey Dunlap Name: Anadarko E&P Company LP Company: Kerr-McGee Oil & Gas Onshore LP Address: 1099 18th Street, Suite 1800 Address: 1099 18th St., Ste. 1800 City: Denver State: CO Zip: 80202 City Denver State CO Zip 80202 Phone: Business Phone: 720-929-6448 E-mail E-mail : kelsey.dunlap@anadarko.com A = Existing Access A= Proposed Access Parcel Location & Sketch Cannon Compressor Station The access is on : WCR 33 Nearest Intersection : WCR 33 & WCR 26 WCR Distance from Intersection : Approx. 760ft Parcel Number: 121134000008 M M Section/Township/Range: SE4 34.3N .66W t 3 r4 N 3 3 Is there an existing access to the property? r NO Number of Existing Accesses: 1 4 Road Surface Type & Construction Information Asphalt Gravel x Treated Other WCR ( c Culvert Size & Type 15" Culvert Materials used to construct Access: Standard Road Base Construction Start Date ASAP Finish Date ASAP Proposed Use o Temporary (Tracking Pad Required)/ $75 o Single Residential/$75 ❑ Industrial/$150 x Small Commercial or Oil & Gas/$75 ❑ Large Commercial/$150 ❑ Subdivision/$150 o Field (Agriculture Only)/Exempt Is this access associated with a Planning Process? ii No x USR o RE o PUD ❑ Other Required Attached Documents - Traffic Control Plan -Certificate of Insurance - Access Pictures (From the Left, Right, & into the access) By accepting this permit, the undersigned Applicant, under penalty of perjury, verifies that they have received all pages of the permit application; they have read and understand all of the permit requirements and provisions set forth on all pages; that they have the authority to sign for and bind the Applicant, if the Applicant is a corporation or other entity; and that by virtue of their signature the Applicant is bound by and agrees to comply with all said permit requirements and provisions, all Weld County ordinances, and state laws regarding facilities construction. �� Signature121714.-- Printed Name Kelsey Dunlap Date 11/04/2014 Approved by .....:rnA r--.4.... c /nn/in Cannon Compressor Station - Access Permit Photos View Looking north on WCR 33 I i- • 1 ;'li'`f‘%) i• ` J',fillit I,•C „�,^• X.. 1 �i I N.- -% •4 IA a.. ., 1. - _ { l 1 4:11.. � . 't ,� ; elf t S t . Z a - t i '1' r:- •1.►v. . --vs l .. - J . 1 I LI ii,t ,` ,ti \) � _� '! li ':.' : �e.. I„ 1. . ttf1 �J � P- 7Y , ..,y (j J •.u': • ♦991 • � • , ii.,,r; t ,'' ell, •tt • J . ' . J .x t'' Y . ..11� { 'Y Ij t '��J, j .. ,.. 'Iltf' % ��IJ.'4lIA^-4-)Mt. �J 7 to 20,1- 3f 1 f • 4 . f j ` • r Ii 10 yir�'rilr } i"Y • 1 - .ii • ' . ♦ • - , tLM . 1 ;f ` t i j • a •• r. ' �' ; - i .. ,• •( • I South View on WCR 33 t4.•- � t £ c i Y. : it :::::iii':•.vi.",:yr.',.,. f:• 1. _ - ; r, , _ • • •Ir • — . .•• lf l r • - - 1 View looking west at access point into parcel from WCR 33 r ra r'• a 1 y,� , • •. •t•ia•... eat. ,k,' \. ..� \it � ♦•1 .. .,`.. 'matt\\ • . \\ r• r( .*IIt t ,1;4..,i rl. • • • i• \t.. _ „Y. .e.a t."1-444 F►r • 1 -.• y r.; . .� `4. ` - s..l*L r " , }� I I 49%4. '.. -1....,. . S •f1 ill . .. • r car.. 'SILL: a . - - - ..1 '.i. r - - • ., .. - - -•- _ - \ • . .• . L _ r - - . - •.• - .. • _ , i ' • { • r. • • 1; ! f \ 4 1 f ., . 1• r T r 4 1 1 t \ 4 fn - _ .. ♦ _ pj "� � 1 b a X11 _ Y ` )r a.V /• • ? ,I A • . ` +a t _ 1'� t! •, f .a r , t • F • . .( yr + r. .+... � . I_y-`.� s r'. � !; �r n .. / .... t ..r. .v"t \ , °-._- 6 � . . . . �• '. .. _ ,Jtl•�y. �_a�S Cannon Compressor Station - Access Permit Photos AO .4 I SSC IPA* • • . . may'~.. o_- ..• �} ' . y f • r y1 • ipW • l..• .. • • View Looking north on WCR 33 µJ �� :k 1u , v': ;�:� '.!'4. .I'. , IS ar_.rr►ry r 1 • } • ,,.s -II' 1 -w. '_ :�SFwQ' -rL 1 -� _ a ' t I View Looking south on WCR 33 .11 • 4, ,, *,i. .. r..1..,, • y.-,- tC .' _ 4 'F, • �� • ��: Y. { • • . - •n .. s . • View looking west at access point into parcel from WCR 33 FIELD-WIDE STORMWATER MANAGEMENT PLAN FOR CONSTRUCTION ACTIVITIES AREA 2 MIDSTREAM PIPELINE OPERATIONS WATTENBERG FIELD, COLORADO REVISED AUGUST 2012 Prepared for: KERR-MCGEE GATHERING LLC Brighton, Colorado FIELD WIDE STORMWATER MANAGEMENT PLAN FOR CONSTRUCTION ACTIVITIES AREA 2 MIDSTREAM PIPELINE OPERATIONS WATTENBERG FIELD, COLORADO REVISED AUGUST 2012 Prepared for: KERR-MCGEE GATHERING LLC 635 North 7th Avenue Brighton, Colorado 80601 Prepared by: LT ENVIRONMENTAL, INC. 4600 West 60th Avenue Arvada, Colorado 80003 (303) 433-9788 TABLE OF CONTENTS 1 .0 CERTIFICATION 1 2.0 INTRODUCTION 2 3.0 SWMP ADMINISTRATOR 2 4.0 SITE DESCRIPTION 3 4. 1 Nature of Construction Activity 3 4.2 The Proposed Sequence of Major Activities 3 4.3 Area of Disturbance 4 4.4 Soil Description 4 4.5 Existing Vegetation 4 4.6 Location of Potential Pollution Sources 4 4.7 Non-Stormwater Discharges 4 4.8 Receiving Waters 5 5 .0 SITE MAPS 5 6.0 STORMWATER MANAGEMENT CONTROLS 6 6. 1 Identification of Potential Pollutant Sources 6 6. 1 . 1 Disturbed and Stored Soils 6 6. 1 .2 Vehicle Tracking Controls 7 6. 1 .3 Management of Contaminated Soils 7 6. 1 .4 Loading and Unloading Operations 7 6. 1 .5 Outdoor Storage Activities 7 6. 1 .6 Vehicle and Equipment Maintenance and Fueling 7 6. 1 .7 Dust or Particulate Generating Processes or Activities 7 6. 1 .8 Routine Maintenance Activities 8 6. 1 .9 On-site Waste Management Practices 8 6. 1 . 10 Concrete Truck Washing 8 6. 1 . 11 Dedicated Concrete and Asphalt Batch Plants 8 6. 1 . 12 Non-Industrial Waste Sources 8 6. 1 . 13 Potential Spills 8 6.2 Best Management Practices (BMPs) 9 6.2. 1 Structural Practices for Erosion and Sediment Control 9 6.2.2 Non-Structural Practices for Erosion and Sediment Control 11 6.2.3 Phased BMP Implementation 12 6.2.4 Material Handling and Spill Prevention 13 6.2.5 Dedicated Concrete or Asphalt Batch Plants 13 6.2.6 Vehicle Tracking Control 13 6.2.7 Waste Management and Disposal, Including Concrete Washout 13 6.2.8 Groundwater and Stormwater Dewatering 14 7.0 FINAL STABILIZATION AND LONG-TERM STORMWATER MANAGEMENT 14 7. 1 Reclamation 14 7.2 Post Construction Structural Measures 15 7.3 Finally Stabilized 15 8.0 INSPECTION AND MAINTENANCE PROCEDURES 16 8. 1 Inspections 16 8. 1 . 1 14-day Inspection/Active Stage 16 8. 1 .2 Monthly Inspection/Completed Stage 16 i �► 8.1 .3 Final Stabilization Stage 17 8. 1 .4 Winter Conditions 17 8. 1 .5 Precipitation Event Inspections 17 8.2 Preventive Maintenance 17 8.2. 1 Good Housekeeping 18 8.2.2 Material Storage 19 8.2.3 Waste Removal 19 9.0 EMPLOYEE TRAINING 19 10.0 RECORD KEEPING 20 11 .0 SWMP REVIEW/CHANGES 20 FIGURES FIGURE 1 AREA 2 STORMWATER PERMITTED AREA TABLES TABLE 1 CHEMICAL PRODUCT LIST TABLE 2 BMP SELECTION CRITERIA TABLE 3 STRUCTURAL AND NON-STRUCTURAL BMP CLASSIFICATION TABLE 4 SEED MIXES AND APPLICATION RATES APPENDICES APPENDIX A STORMWATER GENERAL PERMIT COR-030000 AND KERR- MCGEE GATHERING LLC AREA 2 STORMWATER PERMIT COR- 039803 APPENDIX B SITE-SPECIFIC INFORMATION APPENDIX C BMP MANUAL APPENDIX D TRAINING LOGS ii 1.0 CERTIFICATION Kerr-McGee Gathering LLC (Kerr-McGee) has prepared this Field-Wide Stormwater Management Plan (SWMP) for Construction Activities for Area 2 Midstream Pipeline Operations in the Wattenberg Field, Colorado. I certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons who manage the system or those persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations. Signature Date 8 - 14 --k 2_.- Name Pet ✓ k . Scie► vit Li dam( Title 4 r. c tifir LA S 2-0 . 1 2.0 INTRODUCTION Kerr-McGee prepared this Stormwater Management Plan (SWMP) to be used for Area 2 in the Wattenberg Field, Colorado. This SWMP was prepared in accordance with good engineering, hydrologic and pollution control practices to ensure the Best Management Practices (BMPs) are selected, installed, implemented and maintained to protect surface waters. Changes or additions may be required to address changes in conditions in the project area. As a condition of the Colorado Discharge Permit System (CDPS) permit, the provisions identified in the SWMP will be implemented as written and updated as needed from commencement of construction activity until final stabilization is complete. This document contains the required elements of a SWMP associated with Kerr-McGee's construction activities for Area 2, as defined in the CDPS General Permit for Stormwater Discharge Associated with Construction Activity, Authorization to Discharge under the Colorado Discharge Permit System (General Permit No. COR-030000, effective July 1 , 2007). A copy of the permit submitted to the Colorado Department of Public Health and Environment (CDPHE) for this project is provided in Appendix A. 3.0 SWMP ADMINISTRATOR The SWMP Administrator for Kerr-McGee is responsible for developing, implementing, maintaining, and revising the SWMP. The SWMP Administrator has the authority to dedicate the financial and human resources to implement the SWMP. The SWMP Administrator is: Mr. Paul Schneider — Senior Staff Representative, Denver, Colorado Office: (720) 929-6726 Mobile: (303) 868-6665 The SWMP Administrator will ensure that the SWMP is followed and delegates responsibility for coordination of the SMWP inspections and maintenance of stormwater records to the SWMP Operations Manager. The SWMP Operations Manager will provide support for the SWMP Administrator with the implementation of the SWMP. The SWMP Operations Manager is: Mr. Mike Dinkel — Senior EHS Representative, Brighton, Colorado Office: (303) 655-5342 Mobile: (785) 691 -7788 Both the SWMP Administrator and the Senior SWMP Operations Manager will manage the SWMP Team. Other foremen or designated personnel may also assist in stormwater inspections and maintenance of records. Overall, the SWMP Team is responsible for: • Implementing spill/upset clean up procedures; • Notification to local authorities and local residents of reportable releases; 2 • Coordinating various stages of BMPs implementation; • Conducting inspections; • Maintenance of all records; and • Coordination of a preventive maintenance program and housekeeping measures. 4.0 SITE DESCRIPTION 4.1 Nature of Construction Activity Kerr-McGee currently owns and operates oil and natural gas pipeline systems in the Wattenberg Field area which includes Adams, Arapahoe, Boulder, Broomfield, Denver, Douglas, Elbert, Larimer and Weld Counties, Colorado. Kerr-McGee has split the field into six project areas for operations management purposes. Area 1 lies within Township 2 North through 6 North, and Ranges 62 West through 66 West. Each pipeline is located within a right-of-way (ROW) that is generally 50 feet wide, but can range from 10 to 80 feet wide. These ROW's can extend for several miles covering a multitude of surface land uses. A map of the project area is provided as Figure 1 . 4.2 The Proposed Sequence of Major Activities Gathering lines and pipelines connect oil and gas wells to the existing pipeline system operating in the field. Gathering lines and pipelines are regularly constructed, maintained or repaired. The pipeline construction/maintenance contractor will adhere to the following sequence of operations unless otherwise approved or directed by Kerr-McGee's SWMP Administrator. Revisions to this sequence may be instituted if approved by Kerr-McGee's SWMP Administrator, if such modifications do not result in erosion or sedimentation at the site. Further control measures may be required by the SWMP Administrator in special circumstances. Pipeline construction preparation activities may include, but are not limited to, the following activities: obtain access; install BMPs around stabilized staging area; install BMPs on the downhill limit of construction for erosion and sediment control; and install BMPs at pipeline water crossings. Construction activities may include but are not limited to: clearing of pipeline construction areas; trenching through rural landscape, (including trenching through dry washes); installation of gas pipelines; and backfilling of trenched materials. BMPs will be implemented during construction to control and minimize any runoff of sediment and erosion associated with construction activities. When the pipeline construction is completed, all disturbed areas of the site will be re-vegetated with seed mixtures based on existing native vegetation. Reclamation activities during this phase are accomplished by contouring disturbed soils to conform to the surrounding terrain, by replacing any stockpiled topsoil, and by seeding of disturbed soil areas in order to reestablish vegetative cover. Mulching, using hay or cereal grain straw, may be used in conjunction with the seeding for final stabilization. 3 4.3 Area of Disturbance The total field-wide area of disturbance is approximately 25 acres. The site-specific site boundaries, and areas of disturbance are identified on the site-specific database site maps; specific inspection forms; and history reports presented in the database. 4.4 Soil Description The Wattenberg Field is a large area covering portions of Adams, Boulder, Broomfield, Larimer, and Weld counties. Kerr-McGee's Area 2 operation falls within Weld County. Topsoil varies within the area, and is classified as loam, sandy loam, clay loam, loamy sand, and sand according to the U.S. Natural Resources Conservation Service (http://websoilsurvev.nrcs.usda.qov/app/). Percentages of each type of topsoil vary widely throughout the area. 4.5 Existing Vegetation Kerr-McGee pipelines are primarily surrounded by low shrubs and brush rangeland, tall grass, short grass prairie land, cropland, sand dune complexes, and occasionally urban area. Pre- disturbance ground cover varies from zero to 100%. Specific vegetation data at each construction location are entered on the site-specific inspection forms. 4.6 Location of Potential Pollution Sources The location and description of all potential pollution sources are provided in detail in Section 6. 1 and summarized in Table 1 . 4.7 Non-Stormwater Discharges The following is a summary list of non-stormwater discharges which are allowed under the stormwater permit: • Discharges from emergency fire-fighting activities or a fire hydrant; • Landscape irrigation or return flow; • Uncontaminated springs; and • Construction dewatering. In the event construction dewatering is required at a site, the following conditions will be met: 4 � (ter • BMPs will be installed to control stormwater pollution • The discharge will not leave the site as surface runoff, to surface waters, or to storm sewer systems • The groundwater being pumped will not be contaminated so as to exceed state groundwater standards If the construction dewatering activity cannot meet these conditions, the appropriate permitting will be completed through the state. Additional dewatering information is provided in Section 6.2.8. Kerr-McGee does not anticipate any non-stormwater discharges at the pad sites. 4.8 Receiving Waters Discharged stormwater may directly impact unnamed tributaries to, as well as, Cache la Poudre River, Big Thompson River, Little Thompson River, St. Vrain Creek, Boyd Lake, and then will ultimately be received by the South Platte River. The majority of Kerr-McGee' s pipelines do not intrude or encroach on any wetland acreage. If a wetland is designated to be within a pipeline construction area, Kerr-McGee will consult with the Army Corp of Engineers, as applicable. 5.0 SITE MAPS The site maps are kept in Kerr-McGee's stormwater management database which is intended to manage and track all site-specific stormwater records. The database consists of current and historic inspection forms with supporting Visio map attachments. Maps are updated at every inspection interval and dated to show changes from one inspection to the next. For the purposes of this SWMP, the site-specific map information required to be included in the SWMP (Appendix B) will reside in the Kerr-McGee database. The site-specific information will be updated during the course of the stormwater inspections. In addition to containing the site- specific inspection reports, the database can produce reports to manage and track the needed BMP repairs within a specific time-period. These reports are provided to the BMP contractor on a regular basis, to document and track repair status. Construction site boundaries; ground surface disturbances; areas of cut and fill; storage areas for building materials, equipment, soil or waste; structural BMP locations; non-structural BMP locations (as applicable); locations of springs, streams, wetlands or other surface waters; and other pertinent site-specifics are shown on maps attached to the site-specific SWMP Inspection Reports found in the database. Site-specific features may be hand-drawn. 5 tray 6.0 STORNIWATER MANAGEMENT CONTROLS 6.1 Identification of Potential Pollutant Sources To identify, evaluate, and assess potential sources of stormwater runoff pollutants that may exist at a pipeline site, the following activities and pollutant sources were evaluated: • Disturbed and stored soils; • Vehicle tracking controls; • Management of contaminated soils; • Loading and unloading operations; • Outdoor storage activities; • Vehicle and equipment maintenance and fueling; • Dust or particulate generating processes or activities; • Routine maintenance activities; • On-site waste management practices; • Concrete truck washing; • Dedicated concrete and asphalt batch plants; • Non-industrial waste sources; and • Potential spills. Refer to site-specific maps found in the database for the possibility of these potential pollutant sources existing onsite. 6.1.1 Disturbed and Stored Soils Disturbed soil and excavated materials will be stored on or next to the pipeline excavation within the construction area. Topsoil and other soils will be stockpiled separately and seeded as needed. Excavation in sensitive areas may be conducted using special techniques as specified by the landowner/agency representative. Excavated materials will be utilized as backfill when practical. An exception may be excess rock generated by rock blasting excavation activities. In these areas, some select backfill materials may be required to protect the project area. Excess rock may be constructed into rock check dams within grassed swales, or distributed over a portion of the project area. 6 Er:7 All cut slopes made in steep and/or rolling terrain during construction will be re-graded and contoured to blend into the adjoining landscape and natural drainage patterns will be reestablished to as near pre-disturbance levels as possible. Temporary workspace areas will be restored to as near pre-construction conditions as possible. 6.1.2 Vehicle Tracking Controls Properly constructed and graveled roads provide the best off-site tracking control. Access road entrances adjacent to paved county roads are often graveled to prevent or minimize any off-site soil tracking from pad areas or access roads. In some instances, cattle guards are used to drop off caked mud before the vehicle exits the site area. In addition, minimizing site access, contractor education, and other sediment control BMPs as specified on the site-specific information forms will be utilized. If tracking is observed, the roads will be cleaned by any combination of road scraping/sweeping as necessary. 6.1.3 Management of Contaminated Soils If contaminated soils are excavated at a Kerr-McGee site, additional BMPs will be employed as appropriate to ensure containment of any stormwater runoff In addition, stockpiles of contaminated soil will be removed from the site and disposed or landfarmed as soon as possible. 6.1.4 Loading and Unloading Operations This pollution source is generally associated with potential spills during delivery and unloading of materials throughout the project area. BMP's selected to control this source are materials management practices and personnel training. In the event of a spill, the SWMP material handling and spill prevention procedures will be followed (see Section 6. 1 . 13). 6.1.5 Outdoor Storage Activities The activities associated with this pollution source are storage of material at the staging areas and potential for spills and leaks from these materials. BMP' s selected to control this source are installation and use of material storage and staging areas, materials management practices, personnel training, and following the Potential Spills and Materials Handing and Spill Prevention information (see Sections 6. 1 . 13). A list of chemical products typically used at a Kerr-McGee pipeline construction site is included as Table 1 . 6.1.6 Vehicle and Equipment Maintenance and Fueling Kerr-McGee does not fuel or maintain construction-related vehicles or equipment located at Area 2 sites. 6.1.7 Dust or Particulate Generating Processes or Activities Dust and/or particulates generated from vehicle traffic on graveled access roads may produce fugitive emissions. Dust and particulate generation are highest during dry and hot times of the 7 (pe year. If dust from vehicle traffic on graveled access roads becomes significant, dust suppression procedures (which may include road watering) will be implemented. 6.1.8 Routine Maintenance Activities Routine maintenance activities involving fertilizers, detergents, fuels, solvents and oils are not completed at the Kerr-McGee sites. Herbicides will be applied annually in some areas to control noxious weeds. Herbicide application will always be conducted by certified and trained individuals, and with consideration for runoff potential to nearby surface waters. 6.1.9 On-site Waste Management Practices All waste from materials imported to the construction site are placed in appropriate containment and then removed for disposal/recycling to an appropriate licensed disposal/recycling facility. No waste materials will be buried, dumped, or discharged to waters of the state. 6.1.10 Concrete Truck Washing Concrete truck/equipment washing, including the concrete truck chute and associated fixtures and equipment, is not conducted at Area 2 sites. 6.1.11 Dedicated Concrete and Asphalt Batch Plants No dedicated concrete or asphalt batch plants are located within the Kerr-McGee Area 2 Wattenberg Field, Colorado sites. 6.1.12 Non-Industrial Waste Sources Cleanup of trash and discarded materials will be conducted as noticed. Cleanup will consist of the removal of trash, debris, scrap, or other discarded materials associated with Kerr-McGee activities. All waste from materials imported to the construction site are placed in appropriate containment and then removed for disposal/recycling to an appropriate licensed disposal/recycling facility. This also includes sanitary sewage facilities (typically portable), which will be placed, anchored, and maintained with proper care. 6.1.13 Potential Spills Spills or leaks will be handled by Kerr-McGee personnel or contractors, according to the Kerr- McGee Emergency Response/Oil Spill Contingency Plan. Kerr-McGee personnel conduct discharge prevention training, including procedures for routine handling of products. Loading and transfer issues are discussed as appropriate in monthly Environmental Health and Safety (EHS) meetings. As part of the preventive maintenance program, Kerr-McGee personnel conduct routine inspections for good housekeeping issues, operation and maintenance issues, and the condition of structural controls, specifically around tanks and containers. 8 Srle7 Operators are trained in the safe handling of materials and spill discovery, response, and cleanup procedures during EHS meetings. Emergency numbers are posted at the Brighton office, located at 635 N. 7th Avenue, Brighton, Colorado. The SWMP Administrator, SWMP Operations Manager or their designee will manage spills and other environmental emergencies. Spill response equipment is located at Kerr-McGee's Brighton and Evans offices. Contractors will be utilized, as appropriate, to respond to the spill. For the protection of spill response personnel, all drums, tanks, and other containers are clearly labeled to identify contents, in the event of a spill. 6.2 Best Management Practices (BMPs) BMPs for sediment and erosion control will be accomplished through a combination of construction techniques, vegetation and re-vegetation, administrative controls, and structural features. Typical configurations of structural controls discussed below and technical drawings with references are provided in a BMP Manual (Appendix C). BMP selection is guided by the criteria listed in Table 2. Structural and non-structural BMPs are discussed in the following sections, and are summarized in Table 3. 6.2.1 Structural Practices for Erosion and Sediment Control Structural practices primarily include physical attributes of the midstream pipeline construction sites designed to reduce erosion and control stormwater or sediment movement. 6.2.1.1 Erosion Reduction and Control Construction of the midstream pipelines requires the removal of vegetative cover and topsoil, thereby increasing peak flood flows, water velocity, and the volume of stormwater runoff An increase in water runoff volume and velocity results in increased erosion. Erosion reduction and control will be accomplished by using all or combinations of various erosion control methods. These methods include, but are not limited to the following: • Diversion and control of runon water; • Diversion and control of runoff water; • Vegetation establishment and maintenance; and • Application and maintenance of mulches, tackifiers, tracking, and contouring. Runoff control procedures that will be used to mitigate and reduce the erosive transport forces of stormwater during and after construction of the pipelines will include but will not be limited to the following: • Berms; • Windrows; and 9 Srw--1.2 • Revegetation. Existing vegetation cover and topsoil are removed only where necessary for the operation of equipment and construction of the pipelines. Refer to Tables 2 and 3 for a list of all BMPs to be used throughout the Field Wide SWMP. Appendix C includes details on BMP installation and maintenance procedures. 6.2.1.2 Sediment Reduction and Control The reduction and control of sediment contained in stormwater runoff will be accomplished by the use of sediment containment systems. Sediment containment systems are hydraulic controls that allow the detention of suspended particles via gravity, filtering or entrapment. Sediment controls that will be used to mitigate and control sediments generated from the erosive transport forces of stormwater during and after construction of the pipelines will include but will not be limited to the following: • Silt Fence; • Straw Bales; and • Wattles. Refer to Tables 2 and 3 for a list of all BMPs to be used throughout the Field Wide SWMP. Appendix C includes details on BMP installation and maintenance procedures. 6.2.1.3 Detailed Structural and Administrative Site Management Practices The following structural and administrative site management practices are expected to reduce, minimize, and control erosion and sediment transport: In order to minimize disturbances associated with installation of the pipeline, level and gently sloping terrain outside the construction project area will not be graded, except where necessary. • To prevent tracking of sediment, mud and rocks onto public roads, portions of access roads may be graveled, as appropriate. Other means such as track pads/angular rock or cattle guards may be utilized if appropriate. • Silt barriers (e.g. wattles, silt fence, straw bales) will be installed as needed on down- gradient portions of project areas. • Side hill cuts (cut slopes) will be kept to a minimum to protect local resources while providing a safe and stable plane for the efficient and safe use of equipment. • Where conditions warrant, erosion control structures such as berms will be constructed to divert water away from project areas. These control structures will also reduce soil erosion along and adjoining areas disturbed during construction. 10 • During construction near perennial streams, lakes or wetlands, silt fence, straw bales or wattles may be utilized in order to prevent suspended sediments from reaching down slope watercourses, streams, lakes or wetlands. • Where appropriate, wattles, staked straw bales or silt fence will be constructed adjacent to crossings to reduce potential sedimentation in streams or wetlands. • In areas that have steep slopes, wattles or straw bales or runoff diversions may be installed. • During the reclamation of the pipelines, all cut and fill slopes in steep terrain will be graded and contoured to blend into the adjoining landscape. Natural drainage patterns will also be reestablished. When possible cut and fill slopes will be constructed so they are no steeper than a 1 to 3 ratio. • Pipelines connect pad sites to other gathering operations within the basin. Pipeline connections are regularly maintained, added to, or repaired. These sites are included in this SWMP. Pipeline maintenance can include excavation, backfilling, and re-contouring the disturbed area, as listed above. Appendix C includes details on BMP installation and maintenance procedures. 6.2.1.4 Implementation of Structural Practices The following structural practices (sediment controls) may be utilized at disturbed areas: silt fences, straw bales, earth berms, or equivalent sediment controls. These sediment control structures will be installed so as to protect down slope surface waters, wetlands, and roads from sediment flow due to runoff from a precipitation or snow melt event. All graded surfaces, walls, dams and structures, vegetation, erosion and sediment control measures, and other protective devices identified in the plan will be maintained, repaired, and restored as necessary. Table 3 contains a summary list of structural and non-structural BMPs. 6.2.2 Non-Structural Practices for Erosion and Sediment Control Erosion and sediment control can also be controlled via non-structural BMPs. Non-structural BMPs are BMPs that are not engineered as a stormwater barrier and are capable of limiting the amount of potential pollutants available to reach receiving water bodies. Non-structural BMPs can achieve the same effect as structural BMPs through erosion control, filtration trapping, and the settling of sediment load within a perimeter. Kerr-McGee has implemented non-structural practices for stormwater management into their pad site development, including Program Oversight, Construction Site Planning and Management, and Materials Management. Table 3 summarizes the details of such practices. 11 47'7 All disturbed areas of the site will be re-vegetated to coincide with existing site vegetation patterns. Final site grading will reflect existing grades in order to maintain pre-construction discharge patterns. Crimp mulching, using hay or cereal grain straw will be used in conjunction with the seeding for final stabilization. 6.2.3 Phased BMP Implementation Since pipeline construction usually involve deeper trenching and excavation work, pre- construction BMPs may include additional containment around soil stockpiles, and may involve temporary access road construction BMPs, instead of the pipeline site access roads which are more or less permanent features of the typical pipeline site. Upon backfilling of trenched materials, reclamation activities are accomplished by contouring disturbed soils to conform to the surrounding terrain, replacing any stockpiled topsoil, seeding, and mulching of disturbed soil areas in order to re-establish vegetative cover. During construction, the focus will be primarily on containment-type BMPs. During this phase, stormwater runoff is specifically controlled so as not to leave the pipeline site. BMP examples could include: • a continuous berm to contain stormwater pollutants on site; • straw bales on the down-gradient limit of construction for erosion and sediment control; and • sediment control logs (wattles) or equivalent BMPs in unnamed dry washes and streams; BMPs will be implemented during construction to control and minimize any runoff of sediment and erosion associated with construction activities. Reclamation activities during this phase are accomplished by contouring disturbed soils to conform to the surrounding terrain, replacing any stockpiled topsoil, seeding, and mulching of disturbed soil areas in order to re-establish vegetative cover. For completed sites, containment BMPs are generally removed and areas are re-seeded. These are less active construction periods and less attention is needed regarding runoff when reclamation types of BMPs are put in place to mitigate the potential pollutants. Stabilized staging areas may be used to provide for storage of staging materials and equipment and be used to define the contractor mobilization area. The staging areas can contain a construction trailer; a parking area; dumpsters; a storage area for heavy on-site equipment; unloading/loading areas and a portable sanitary facility. No fuel storage tanks will be present in the staging areas. Dirt/mud will be removed from staging areas as needed. Stabilized staging areas will be inspected for adequate vehicle tracking control and perimeter control. The stabilized staging areas should be repaired or modified as needed. Activities during this phase include maintenance of access roads via stabilization of the given roadways, and long term maintenance of the erosion and sediment control structures. When the construction activity is completed, all disturbed areas of the site will be re-vegetated with seed mixtures based on existing native vegetation. Abandonment with final reclamation 12 activities are accomplished by contouring disturbed soils to conform to the surrounding terrain, by replacing any stockpiled topsoil, and by seeding of disturbed soil areas in order to re-establish cover vegetation. Mulching, using hay or cereal grain straw, may be used in conjunction with the seeding for final stabilization. Permanent stormwater BMPs, such as culverts, will remain in place after final stabilization. Depending upon the type of site, the site terrain, and the phase of construction, different stormwater BMPs will be utilized. Various BMP options are listed in Table 2, and design specifications are shown in the BMP Manual (Appendix C). 6.2.4 Material Handling and Spill Prevention An Emergency Response and Oil Spill Contingency Plan has been written for this Project site as it does meet the applicability criteria set forth in 40 CRF Part 109, for responding to discharges of oil, especially from areas or equipment that have inadequate secondary containment as described in each facility's SPCC Plan. The guidelines in this part establish minimum criteria for the development and implementation of State, local, and regional contingency plans by State and local governments in consultation with private interests to insure timely, efficient, coordinated and effective action to minimize damage resulting from oil discharges. Such plans will be directed toward the protection of the public health or welfare of the United States, including, but not limited to, fish, shellfish, wildlife, and public and private property, shorelines, and beaches. The development and implementation of such plans shall be consistent with the National Oil and Hazardous Materials Pollution Contingency Plan. State, local and regional oil removal contingency plans shall provide for the coordination of the total response to an oil discharge so that contingency organizations established there under can function independently, in conjunction with each other, or in conjunction with the National and Regional Response Teams established by the National Oil and Hazardous Materials Pollution Contingency Plan. 6.2.5 Dedicated Concrete or Asphalt Batch Plants Kerr-McGee does not have or subcontract any dedicated concrete or asphalt batch plants for its pipeline construction activities in Area 2. 6.2.6 Vehicle Tracking Control Kerr-McGee will employ BMPs to minimize vehicle tracking. This topic was previously discussed in Section 6. 1 .2 of this SWMP. 6.2.7 Waste Management and Disposal, Including Concrete Washout Waste disposal is previously discussed in Sections 6. 1 .9 and 6. 1 . 12 of this SWMP. Concrete washout does not occur at Kerr-McGee's sites, and therefore, will not be a potential pollutant to stormwater. 13 6.2.8 Groundwater and Stormwater Dewatering Construction dewatering may take place on a limited basis at Kerr-McGee sites. The permit allows for conditional discharge of construction dewatering to the ground (to infiltrate), however no groundwater from construction dewatering can be discharged as surface runoff or to surface waters. For large construction projects with planned dewatering activity, Kerr-McGee will apply for a separate dewatering permit from the state, as required. 7.0 FINAL STABILIZATION AND LONG-TERM STORMWATER MANAGEMENT 7.1 Reclamation Unless otherwise directed by the landowner or a jurisdictional authority, rocks, cut vegetation, and other surface material temporarily stockpiled during construction will be redistributed as backfill on the project area. During reclamation, sediment BMPs will remain in use. Disturbed areas will be seeded using seed mixes appropriate to the location as noted in Table 4, unless the landowner wishes to return the land to agricultural production. Local soil conservation authorities with the U.S. Natural Resources Conservation Service, surface owners and/or reclamation contractors familiar with the area may be consulted regarding the other seed mixes to be utilized. On terrain where drill seeding and/or thatching/mulching are appropriate, seed may be planted using a drill equipped with a depth regulator to ensure proper depth of planting. The seed mix will be evenly and uniformly planted over the disturbed area. Drilling will be used where topography and soil conditions allow operation of equipment to meet the seeding requirements of the species being planted. Broadcast seeding will occur on steep terrain and on areas where the cut vegetation and rocks were redistributed over a right-of-way. Hydraulic mulching is suitable for disturbed areas requiring temporary protection until permanent stabilization is established, and disturbed areas that will be re-disturbed following an extended period of inactivity. Hydraulic mulch consists of applying mixture of shredded wood fiber or a hydraulic matrix and a stabilizing emulsion or tackifier with hydro-mulching equipment, which temporarily protects exposed soil from erosion by raindrop impact or wind. Seeding will be done when seasonal or weather conditions are most favorable according to schedules identified by the jurisdictional authority, reclamation contractor, or landowner. Whenever possible, seeding will be timed to take advantage of moisture, such as early spring or late fall, (to benefit from subsequent winter precipitation). Seed mixes will be planted in the amount specified in pounds (as noted in Table 4) of pure live seed per acre. No primary or secondary noxious weeds will be in the seed mix. The re-establishment of vegetative cover as well as watershed stabilization measures will be scheduled during the working season and before the succeeding winter. Re-vegetation will be accomplished as soon as practical following the reclamation of a pipeline. 14 ar Mulch will be laid down during re-vegetation as appropriate. The cut vegetation and rocks will act like mulch in the areas where they are applied. Where straw or hay mulch is applied, the mulch will be applied and crimped into the soil. The need for fertilizers will be determined in conjunction with the landowner. If fertilization is necessary, the rates of application will be based on site-specific requirements of the soil. A special condition exists for pipeline sites within crop lands. According to the CDPHE Stormwater Fact Sheet dated July 2007: When portions of an oil and gas site are restored to crop land in accordance with the COGCC rules, and returned to the control of the farmer following interim reclamation, permit coverage is no longer required for those areas, and it is not necessary for the oil and gas site to either stabilize or reassign permit coverage for the area restored to crop land. When this condition exists for a pipeline site, inspections will be discontinued and the site will be removed from the stormwater construction permit program. 7.2 Post Construction Structural Measures Erosion control blankets along with seeding and mulching and/or permanent structural measures may be installed on steep slopes and at wetland and stream crossing boundaries. After restoration and reclamation work is complete, required repairs to vegetation and erosion and sediment control BMPs will be completed as required. 7.3 Finally Stabilized According to stormwater regulations, "finally stabilized means that all ground surface disturbing activities at the site have been completed and all disturbed areas have been either built on, paved, or a uniform vegetative cover has been established with an individual plant and a density of at least 70 percent of pre-disturbance levels, and the vegetation cover is capable of providing erosion control equivalent to pre-existing conditions, or equivalent permanent, physical erosion reduction methods have been employed." A special condition exists for oil and gas sites regarding pavement. According to the CDPHE Stormwater Fact Sheet dated July 2007: Areas developed as stabilized unpaved surfaces as needed for operation of the facility after interim reclamation also qualify as 'finally stabilized". The term "stabilized unpaved surfaces " includes dirt road surfaces and the portions of the well pad surfaces that cannot be revegetated due to operational necessity, but does not include slopes, ditches and other areas where revegetation is necessary. Stabilized unpaved surfaces must be prepared in such a way as to minimize erosion, such as preventing rill erosion on pad surfaces or roads. 15 �►/ 8.0 INSPECTION AND MAINTENANCE PROCEDURES 8.1 Inspections Inspections will be conducted to document the status of erosion and sediment control structures and revegetation efforts. Inspection forms will document non-compliance conditions, including any uncontrolled releases of sediment or other contaminants, additional BMPs that are needed, or repair and maintenance issues. Required actions or modifications, as documented on the SWMP Inspection Report, will be implemented as soon as possible, immediately in most cases, to minimize the discharge of pollutants. Routine inspections may be conducted along access roads and pipelines during all phases of work and after a precipitation-related event. All inspection observations will be recorded on the SWMP Inspection Report. The SWMP Inspection Report provides a standardized format that will be completed during all inspections, and includes a signature line for the inspector to ensure compliance with the regulations. For stormwater regulation purposes, construction sites have been divided into stormwater inspection stages: Active, Completed, and Final Stabilization. Each of these stormwater inspection stages is discussed below. Once a Completed Site is revegetated and stable, it will be removed from this stormwater construction permit program and all site-specific structural BMPs will be removed. A special condition exists for pipeline sites within crop lands, which is detailed in Section 7. 1 of this plan. When pipeline sites are being returned to a farmer for agricultural usage, the sites may be removed from the stormwater construction permit program. Personnel responsible for inspections will be trained to evaluate stormwater management concerns, erosion and sediment control BMPs, and to evaluate pipeline and surrounding area vegetation. 8.1.1 14-day Inspection/Active Stage The construction phase of work is classified as the Active Stage, according to stormwater regulations. The inspection frequency is every 14 days during the Active Stage and must be conducted within 24 hours after the end of any precipitation or snowmelt event that causes surface erosion. The construction perimeter, disturbed areas, and any stored materials that are exposed to precipitation will be inspected for evidence of, or the potential for pollutants to possibly enter the drainage system. Erosion and sediment control systems identified on the site-specific SWMP Inspection Report will be inspected to ensure they are in good condition and operating properly. 8.1.2 Monthly Inspection/Completed Stage For sites or portions of sites that meet the following criteria, but final stabilization is not achieved due to a vegetative cover that has not become established, a thorough inspection will be conducted at least once every month, and post-storm event inspections are not required. This reduced inspection schedule is only allowed if: 16 (kr / • All construction activities that will result in surface ground disturbance are completed; • All activities required for final stabilization, in accordance with the SWMP, have been completed, with the exception of the application of seed that has not occurred due to seasonal conditions or the necessity for additional seed application to augment previous efforts; and • The SWMP has been amended to indicate those areas that will be inspected in accordance with the reduced schedule. However, because slopes and other disturbed areas may not vegetated, erosion in these areas can still occur which requires maintenance activities such as regrading, erosion control blankets, and seeding of problems areas. As such, inspections must continue in order to address these situations. The SWMP for the site must be amended to indicate those areas that will be inspected at this reduced frequency. 8.1.3 Final Stabilization Stage Final stabilization is reached when all ground surface disturbing activities at the site have been completed, and uniform vegetative cover has been established with an individual plant density of at least 70% of pre-disturbance levels, or equivalent permanent, physical erosion reduction methods have been employed. When the site has reached final stabilization, an Inactivation Notice will be filed with CDPHE to inactivate the stormwater permit coverage for that specific. All temporary site-specific BMPs no longer required will be removed. 8.1.4 Winter Conditions Inspections will not be required where construction activities are temporarily halted because snow cover exists over the entire site for an extended period as long as melting conditions do not exist. The following information must be documented in the inspection record for use of this exclusion: dates when snow cover occurred, date when construction activities ceased, and date melting conditions began. 8.1.5 Precipitation Event Inspections Active site inspections will be conducted within 24 hours after a precipitation or snowmelt event that causes surface erosion. Surface erosion generally occurs when precipitation or snowmelt results in surface water flow. If a construction site is temporarily idle, no construction activities will occur following a storm event. At such sites, post-storm event inspections must be conducted prior to restarting construction activities at the site, but no later than 72 hours following the storm event, and the delay will be noted in the inspection report. 8.2 Preventive Maintenance Preventing stormwater from passing through construction areas where contamination may occur is a key element of preventive maintenance. Another key element of preventive maintenance is the routine inspection and repair of erosion and sediments control structures. Regular cleaning of diversion ditches and other BMPs to keep them free of debris and sediment will be practiced. Spillways and culvert systems will also be routinely cleaned and inspected. These maintenance 17 procedures will help to ensure that the stormwater does not leave disturbed areas via unintended channels. The following preventive maintenance procedures will be implemented to reduce or eliminate potential stormwater contamination sources that may exist at a construction site: • Storage containers, fuel tanks, and equipment used during construction activities should be visually inspected routinely for obvious leaks. These inspections should be conducted by site and contractor personnel as they perform their routine duties; • Drums will be properly labeled so an enclosed substance can be quickly identified. OSHA-approved labeling and sign systems will be followed for all secondary containers; • Erosion damage to the berms, outfalls, silt barriers, collection channel, containment ponds, and any other erosion and sediment controls will be repaired as soon as practical; • Areas of stained soil will be inspected in order to identify the sources of the staining. Contaminated soil will be removed and properly disposed; • Energy dissipating material, such as riprap, cobbles or gravel will be placed, or existing materials will be utilized at the stormwater outfalls to prevent erosion damage. Barrow ditches should be free from vegetation and debris which may cause impounding of stormwater; and • Stormwater management structures will be cleared of debris and repaired when necessary; and surface runoff controls such as culverts, and ditches will be used to control runoff. 8.2.1 Good Housekeeping In accordance with BMPs that provide procedures to eliminate contamination, and direct, divert, and contain stormwater, Kerr-McGee has implemented a number of housekeeping practices. These practices will help prevent soil sediment, trash, and toxic or hazardous substances from entering navigable waters. Housekeeping practices include regular cleaning, organization and maintenance of equipment and erosion and sediment control structures throughout the project. Areas where chemicals are stored and used at the project should be stored in buildings or containers where there is limited potential for stormwater contact. The following items will be addressed in order to maintain a clean and orderly construction site during the various phases of work: • Inspect pipeline areas routinely; • Correct deficiencies noted during inspections; • Clean and maintain stormwater management structures and components; 18 �► • Routine trash collection and proper disposal; • Familiarize employees and contractors with spill clean-up equipment and storage locations; and • Familiarize employees and contractors with good housekeeping procedures and pad pollution prevention procedures. 8.2.2 Material Storage The following good housekeeping practices will be followed at the material storage areas: • Storage containers will be stored away from direct traffic to prevent accidents. They will also have proper labels; • Dumpsters and trash receptacles will be enclosed in order to prevent the dissemination of refuse; • Storage areas will be kept free of refuse; • Chemical substances used at pads will be properly labeled and will have proper spill containment; and • Chemical substance containers will be clearly labeled with an MSDS kept on file. 8.2.3 Waste Removal All waste from materials imported to the construction site will be removed for disposal/recycling to an appropriate licensed disposal/recycling facility, including sanitary sewage facilities (typically portable). No wastes of imported materials will be buried, dumped, or purposely discharged to waters of the state. There are no other pollutant sources from areas other than construction areas. 9.0 EMPLOYEE TRAINING Kerr-McGee will inform and train employees who are involved with SWMP activities. Training will cover information and procedures contained in the SWMP and will be conducted on an as- needed basis. Personnel work responsibilities will be used to identify the appropriate attendees. Safety and environmental elements of the SWMP will also be covered. A Training Log (Appendix D) will be kept and updated following each training event. The following topics may be presented and discussed during SWMP training: • Introduction to CDPS Stormwater Permit; • Stormwater regulations; • Purpose of stormwater permit; 19 ,� • Requirements of stormwater permit; • Components of the SWMP; • Identification of potential pollutant sources; • BMPs; • Preventative maintenance; • Good housekeeping; • Inspections and maintenance; and • Record keeping. 10.0 RECORD KEEPING The following record keeping procedures will be implemented in order to provide accurate and complete documentation of events associated with the stormwater management program. Routine inspections will include the 14-day, monthly, and post precipitation events. Stormwater related inspection records, site maps, and diagrams will be also kept on file or in the Kerr-McGee database. All stormwater related records will be filed and stored by Kerr-McGee for a minimum of three years after each individual site has achieved final stabilization 11.0 SWMP REVIEW/CHANGES Kerr-McGee will amend the SWMP whenever there is a significant change in design, construction, operation, or maintenance, which has a significant effect on the potential for the discharge of pollutants to waters of the state, or if the SWMP proves to be ineffective in achieving the general objectives of controlling pollutants in stormwater discharges associated with construction activities. This SWMP is considered a "living document". 20 rilF FIGURES TABLES L-7 ,e APPENDIX A STORMWATER GENERAL PERMIT COR-03000 AND KERR-MCGEE GATHERING LLC STORMWATER PERMIT COR-039803 L-7 „,-7ff--'7 APPENDIX B SITE-SPECIFIC INFORMATION APPENDIX C BMP MANUAL LU7i APPENDIX D TRAINING LOGS FIGURE a c j . ..„ cP4, x rr _______„alliallalLai a •Allik a - a . . . . . „ .. .. , •_ ,. . , . , • ,.....• ..• . , . . ... . . , . ., . e S I 4j I i I . . 1,• µ - - - •• .y y • ;. X 1 06 1 . , ... ;.; .Ilk t r;,{ —'+ _t `) o• E 7 I' i I i '.•1 I y a`f.. - - _l _ u 5 • t ,•� i - i t �J�rF — t _ l , s- .._�' -q j ,r_LI �_.tw _ •'' _ _ _ —1ot 1.jgi_ r+ C• _;•t,= - _ .,--• _4. -'`L'.t. ' -; .. ._.�s- .~a. . .•r,J - ••• - --•I j + I . it.'.• 11 t. , • s• fY1 • li' •`— '` tF { j (• T` • ` .1 < p ' e, r Z-2 v J •! - /. - t rI "' - ,r I• - / l_ i'• t t { L..• ] {( '• •1 t S 1r' �i•/% " T'/jf'--� r'ta_ + f •,� I ' Y ' J i 1 I7 • - ''. I. a< li 7 i 1, - I I _ iti; t{ r '-.• { - I ,I . 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" LLl ` is}-, •r< - %�• J - , -+.)-.—•�y `' i1 s �f I • •� {.� •! - ;•-. .. .. _ I ;r. .. - Y _ I CZTT'vvY� t •S • 7' :+ • is r O ICI). 7 • O1— 0_ - a . "+.Jfi'. ",a' • t7. _ '... , ' • i . I • II C7i1 ` . _ Z i •4.43:14,- EE `fl / :il't '.J w ..�i ._ . :r• .�.•{ s: ^',� _--. -- -..ry We- ut�s� _-._�in �sr�e LLI ii �� ti l �sz—aer,+s r C + • "�J ] !� rr , 'IT,' d > Y.. \i r .. 'i� 't;< - '�; y\ • �- < i. W 7 � t F ' y I , • t- X44 t�f: > L. J i O TABLES TABLE 1 CHEMICAL PRODUCT LIST AREA 2 MIDSTREAM PIPELINE PROGRAM WATTENBERG FIELD, COLORADO KERR-MCGEE GATHERING LLC MSDS Product Name Manufacturer's Product Use/Chemical Description Chemical Manufacturer Product Number FUELS & LUBRICANTS Acetylene Fuel _BOC Gases Chain Oil 00003 Lubricant Delta Rky. Mtn. Diesel Fuel Fuel Frontier Oil Co. Drive Chain Fluid 7684 Lubricant Chevron 80-90W Gear Oil 7234 Lubricant Chevron Grease 6790 Lubricant Chevron Hydraulic Oil 10910 Lubricant Chevron Motor Oil 6931 Lubricant Chevron Propane 03840 Fuel BP (Amoco) PAINTS Paints - Industrial Enamel Paint Sherwin-Williams Paints - Gloss White Paint Tnemec Co. Paints - Primer Primer Tnemec Co. Paints - Thinner Paint Thinner Tnemec Co. 'paints - Orange Marking Paint Fox Valley Systems aints - Yellow Marking Paint _Fox Valley Systems MISCELLANEOUS Antifreeze 10298 Various uses Texaco Methanol 001065 Various uses Airgas, Inc. Starting Fluid 81030 Various uses Lawson Products Thread Dope (Cal Bronze LF 302G Various uses Bestolife Corp. WD-40 (Aerosol) Various uses WD-40 Company WD-40 (Liquid) Various uses WD-40 Company Primer (Adhesive) Tape Coat Primer - Brush applied Polyken Primer (Adhesive) Tape Coat Primer - Aerosol Polyken Grease Valve Grease Kem-Lube Grease Valve Grease Valtek TABLE 2 BMP SELECTION CRITERIA AREA 2 MIDSTREAM PIPELINE PROGRAM WATTENBERG FIELD, COLORADO KERR-MCGEE GATHERING LLC ACTIVE COMPLETED I FINAL STABILIZATION Pipelinf«, Berm Berm Berm Silt Fence Straw Bales Revegetation Straw Bales Wattles Mulching, with or without a tackifier Wattles Mulching, with or without a tackifier Notes: BMP = Best Management Practice LT9 Tit, 0) „. 4 •ice • a) E 0 G et on c CC 5G O rr b a t, a. ao EA o o▪ o o z 49" %a U s. th" ma o ▪ CO . O I. H Otu 0 al immil x �a) �� w cil a a:)52 o 10 w 3 -' o'o. o 1-1 oo V O V) QC C4 (/) cn r� C V © A V ° o 2 -z, 0 a vi � a c4 .44 a4 rt. ct3 Os ^ . c� . 4 W 0 Z °� H a = b Ct co r, Wrri � A x E a -a .4:1O g - mom C, INI Pet H � � w F � cd Li cn ex = ° � � � OZ clan, CO p o = s. E 3 Q, = 2 cn W Z • O ° H : U a" , c-. bA RS ,-• o N Q cn U O- O y 3 5 t Q, a. nO 4-. _ g ,..:1 c.0 o to f ti ' '� 0 3 a Q i " p cf ^ ° - otom. 3 Es o 0 0 °�) o � acs 0 y U U E-- U vn z 2 > ct C/)&D CID E. U O e, U •= y G. U ct > 1-- '4 N y ..a y et C -ao cidO E �+ Q. ct o Q) ob bL vUi ¢, _ ct •L cA ..C , C c s o a 0 > S O o E " Q = E t73 ° o = m ct cap ,o co, II auon wco zn TABLE 4 SEED MIXES AND APPLICATION RATES AREA 2 MIDSTREAM PIPELINE PROGRAM WATTENBERG FIELD, COLORADO KERR-MCGEE GATHERING LLC SEED MIX APPLICATION RATE (lbs/acre) PBSI Dryland Aggressive Mix (20%) Green Needlegrass, Lodorm (20%) Slender Wheatgrass, Native (20%) Western Wheatgrass, Native 25 (20%) Pubescent Wheatgrass, Luna (20%) Intermediate Wheatgrass, Oahe/Rush PBSI Native Prairie Mix (25%) Blue Grama ( 10%) Buffalograss (20%) Green Needlegrass 15 (20%) Sideoats Grama (25%) Western Wheatgrass PBSI Native Sandyland Mix (20%) Yellow Indiangrass ( 10%) LittleBluestem (10%) Indian Rice Grass ( 10%) Sideoats Grama 15 (10%) Sand Lovegrass ( 10%) Prairie Sandreed (20%) Switchgrass PBSI Premium Irrig. Pasture Mix #1 (75%) Meadow Bromegrass, Paddock/Fleet 25 (25%) Orchardgrass, Elsie/Megabite/Paiute Notes: lbs/acre = pounds per acre = percent APPENDIX A STORMWATER GENERAL PERMIT COR-03000 AND KERR-MCGEE GATHERING LLC STORMWATER PERMIT COR-039804 STATE OF COLORADO Bill Owens, Governor Dennis E. Ellis, Executive Director o Dedicated to protecting and improving the health and environment of the people of Colorado (ff2S \9 A 9 P Pp , 4300 Cherry Creek Dr. S. Laboratory Services Division �* -9t1:601, * Denver, Colorado 80246-1530 8100 Lowry Blvd. * 1876 6 * ,- Phone (303) 692-2000 Denver, Colorado 80230-6928 TDD Line (303) 691 -7700 (303) 692-3090 Colorado Department Located in Glendale, Colorado of Public Health http://www.cdphe.state.co.us and Environment 4/4/2006 Tim Fitzsimmons, Oper. Manager Kerr-McGee Gathering LLC 635 N. 7th Avenue Brighton, CO 80601 303/659-5922 RE: Final Permit, Colorado Discharge Permit System — Stormwater Certification No: COR-039803, Weld County Area 2 Local Contact: Tim Fitzsimmons, Oper. Manager, 303/ 659-5922 Anticipated Activity: 03/30/2006 through On >5 acres (>5 acres disturbed) Dear Sir or Madam: Enclosed please find a copy of the permit certification that was issued to you under the Colorado Water Quality Control Act. Your certification under the permit requires that specific actions be performed at designated times. You are legally obligated to comply with all terms and conditions of your certification. Note that the stormwater permit for construction activities now covers construction sites disturbing down to one acre (the previous threshold was 5 acres). Effective July 1 , 2002, any construction activity that disturbs at least 1 acre of land (or is part of a larger common plan of development or sale that will disturb at least 1 acre) must apply for permit coverage. Please read the permit and certification. If you have any questions please visit our website at http://www.cdphe.state.co.us/wq/permitsunit/wgcdpmt.html, or contact Matt Czahor at (303) 692-3575. Sincerely, 60 $ ,--S Kathryn Dolan Stormwater Program Coordinator Permits Unit WATER QUALITY CONTROL DIVISION Enclosure xc: Regional Council of Governments Weld County Health Depaitalent District Engineer, Technical Services, WQCD Permit File Fee File Permit No. COR-030000 Facility No. COR-039803 PAGE 1 of 17 CERTIFICATION CDPS GENERAL PERMIT STORMWATER DISCHARGES ASSOCIATED WITH CONSTRUCTION Construction Activity: Oil & Gas Field Development This permit specifically authorizes: Kerr-McGee Gathering LLC to discharge stormwater from the facility identified as Area 2 which is located at: map in file Greeley, Co latitude 40.364, longitude 104.899 in Weld County St. Vrain Creek to: South Platte River effective: 04/04/2006 Annual Fee: $270.00 (DO NOT PAY NOW. You will receive a prorated bill.) APPENDIX B SITE-SPECIFIC INFORMATION L-ri ir /1 01 x Lease/Name: MS Skyway 3, 4, 18, & 31- 11 AFE: 2018951.GAT TWN : 5N RNG : 67W SEC: 11 1 Inspection Date: Land Use: Wetlands/Grass 3/19/09 0 Runoff Risk: Medium Tracking: 848114 l ' r WETLANDS itiDRAW Power Statio � . ioy Using Road As BMP �%' L � � b 750\ \ A A Draw \ moo, Cr .� Akij at m :: Grass n a J- , J as Grass Draw -- .,, -.. ,\v.__Pre-Existing Hard �� Surface Berm � J Walk Site And Repair Mal 1, Stakes Where Draw E .3 07 Needed 4 ±h Natural Berm Receiving Waters: Gully AGRIC 100' W and NE rain QA A Area of disturbance defined > 11 by BMP placement. zt.: Construction boundary AGRIC ' a r x. 'pp o 10 outside of BMP placement. 1 Pig Launcher one r, in N HWY 34 I 1 .0 Miles N LEGEND Pit Pit f ""'r""` Straw Wattle c> Topographic ® Berm A AST Slope Stock Pile Dirt Road SEP Seperator t a Culvert Paved Road © Water Sump NOT TO SCALE Dry Ditch (#27 Lease/Name : Midstream Gray 3, 4, 28, 31-16 Well Connect TWN: 4N RNG : 67W SEC: 16 IL 44 0 Land Use: Wetlands/Grass Ins ctioAFE# API: �1�14 26917 Inspection Date: 3112109 2005509 Runoff Risk: Medium Tie in Point For 2012324 2011893 16" Pipeline 2005510 WCR 46 Area of disturbance defined by BMP placement. Construction boundary approx. 10' Topographic Slope outside of BMP placement. 270' 7Q 7 .. •• Ak it ♦1 •1 •► •L o i _ Flowline _ m • W TL rDS Ill Dry Ditch Natural Berm AGRIC e Golden Eye Drive LEGEND Pit Pit zu-w•°'• Straw Wattle Trailer ® Bonn ►o Hay Bale ® Frac Tank 0 Stock Pile Dirt Road ilk Paved Road Cattieguard .. Wellhead Dry Ditch NOT TO SCALE SEP Separator +- Slit Fence II Culvert Topographic Slope APPENDIX C BMP MANUAL tr.--- i-e9 Table of Contents Section pie Berm (B) 2 Check Dam (CD) 5 Culvert (C) 12 Culvert Protection (CP) 19 Discharge Trench (DT) 26 Ditch (D) 28 Ditch and Berm (DB) 31 Erosion Control Blanket (ECB) 36 Filter Berm (FB) 41 Hydro-mulch (HM) 43 Land Grading (LG) 45 Liner (L) 49 Mud Containers (MC) 51 Mulching (M) 53 Ripping (RP) 57 Riprap (R) 60 Roadside Ditches (RSD) and Turnouts (TO) 66 Sediment Trap (ST) 71 Seeding (S) 75 Silt Fence (SF) 80 Straw Bale Barrier (SBB) 84 Soil Roughening (SR) 88 Tank Containment (TC) 91 Temporary Slope Drains (TSD) 93 Temporary Stream Crossing (TSC) 96 Terracing (T) 98 Tracking Pad (TP) 101 Vegetative Buffer (VB) 104 Wattles (W) 106 Windrow (WR) 109 Wind Erosion Control (WEC) 112 Berm (B) a _ -_ _i - • Or '-- . -. r ifa Description A berm is a ridge of compacted soil located at the top or base of a sloping disturbed area to contain or divert surface water runoff. Berms may be constructed from either excavated topsoil or subsoil. The purpose of a berm is to control runoff velocity, divert on-site surface runoff to a sediment trapping device, divert clean water away from disturbed areas, and to provide a safe slope barrier for vehicle traffic. Applicability Berms are usually appropriate for drainage basins smaller than five acres, but with modifications they can be capable of servicing areas as large as ten acres. With regular maintenance, earthen berms have a useful life span of approximately 18 months. Berms are applicable for the following applications: • Along the outside shoulder of an in-sloped road to ensure runoff from the roadway drains inward and to protect the fill slope from continual disturbance during road blading and maintaining; • Upslope of cut or fill slopes to divert flows away from disturbed areas; • Downslope of cut or fill slopes to divert on-site runoff into a stabilized outlet or sediment trapping device; and • Along the outside shoulder of a road to provide vehicle safety. Limitations • Berms may erode if not properly maintained, compacted, and/or stabilized with vegetation. Berms which are adjacent to concentrated flows will require erosion blanketing. If a berm crosses a vehicle roadway or entrance, its effectiveness may be reduced. Wherever possible, berms should be designed to avoid crossing vehicle pathways. Design Criteria 2 `��``/l�j;�i 1�i��., 1 .5 y`r*" T ' min ''y _ .$1-.S. 1- EARTH BERM ��y A�4 `' ``-� 4fei1 Ore rrr�y�.�1`�1��r DIRECTION OF FLOW r_ ,,,„*. Aw0G Drawing: URS 2008 Construction Specifications 1. Prior to berm construction, remove all trees, brush, stumps, and other objects in the path of the berm and till the base of the berm before laying the M. Fill may consist of topsoil or subsoil excavated during the construction of nearby roads or well pads. 2. For roadside berms, construct according to Figure B-1 . 3. To remain effective, berms should be compacted with tracking equipment, if possible. 4. All berms shall have positive drainage to a stabilized outlet so runoff does not collect in ponds on the upslope side of the berm, but instead flows along the berm until it reaches a stabilized outlet. Field location should be adjusted as needed. The stabilized outlet may be a well-vegetated area, a well pad detention pond, or a sediment control such as a silt fence or sediment trap where sediment can settle out of the runoff before being discharged to surface water. 5. If the expected life span of the berm is greater than 15 days, it is strongly recommended that the berm be stabilized with vegetation or an erosion control blanket immediately after construction. Stabilization is required where concentrated flows are expected. 6. Berms should be constructed and fully stabilized prior to commencement of major upslope land disturbance. This will maximize the effectiveness of the structure as a stormwater control device. Maintenance Considerations The frequency of inspections should be in accordance with the Stormwater Management Plan (SWMP). Berms should be inspected for evidence of erosion or deterioration to ensure continued effectiveness. Berms should also be maintained at the original height. Any decrease in height due to settling or erosion, which impacts the effectiveness of the BMP, should be repaired. Removal Berms should remain in place and in good condition until all upslope disturbed areas are permanently stabilized. There is no need to formally remove the berm on completion of stabilization until interim or final reclamation. References United States Environmental Protection Agency (EPA), National Pollutant Discharge Elimination System (NPDES). Construction Site Storm Water Runoff Control. Washington, D.C., February, 2003 . http://cfpub.epa.gov/npdes/stormwater/menuofbmps/index.cfm New York State Department of Environmental Conservation, New York Guidelines for Erosion and Sediment Control. New York. August 2005 . http://www.dec.ny.gov/chemical/29066.html 3 Figure B- 1 ev rG t3 a9.3 tea: fr. Aga' }dj+t ?� fi W Ls t;tt ILI go f2 cs "i a :O's •! 9 ' • t!4 S!V P t•6'4y lWA A4A of "ye" P `s • 4 Check Dam (CD) • ,u S / Description Check dams are small, temporary dams constructed across a diversion or roadside ditch. Check dams can be constructed using gravel, rock, sandbags, gravel bags, earth with erosion control blanketing, straw bales, or synthetic materials to slow the velocity of concentrated flow in a channel and thus reduce erosion. As a secondary function, check dams can also be used to catch sediment from the channel itself or from the contributing drainage area as stormwater runoff flows through or over the structure. Applicability Check dams are most often used in small, open channels with contributing drainage area of less than 10 acres and side slopes of 2: 1 or less. Check dams may be used in the following applications. • In diversion or roadside ditches where it is not practical to line the channel or implement other flow control and sediment control practices; • In diversions or roadside ditches where temporary seeding has been recently implemented but has not had time to take root and fully develop; • As a series of check dams, spaced at appropriate intervals, used in one of the above two applications. Rock ditch checks should be perpendicular to the flowline of the ditch and must be designed so that water can flow over them, not around them. The ditch check should extend far enough so that the ground level at the ends of the check is higher than the low point on the crest of the check. The following table provides check spacing for a given ditch grade: 5 Ditch Grade Check Spacing Check Spacing (Percent) (feet) (meters) 5 59 18 6 49 15 7 43 13 8 36 11 9 33 10 10 30 9 Limitations • Check dams should not be used in live, continuously flowing streams unless approved by an appropriate regulatory agency. • Check dams may require frequent removal of accumulated sediments. Dams should therefore be located in areas accessible to maintenance vehicles. • Leaves have been shown to be a significant problem by clogging check dams in the fall. Therefore, they might necessitate increased inspection and maintenance. • Straw bale check dams decompose over time, and may be consumed by livestock. 6 Design Criteria ROCK CHECK DAN • f eil P0C8 co Kt,' /I I PONE A at a•t��e•��i�i� ?. LRGK4W LE -1Ni ••• �c- .nres�#. Qpl now--osoliiibe • •• �NA,eeliejl .✓ Pjfx+LE{t PONT A L - The distance such that pourts -...` Pr[t E A and B are of equal elevation. A B t ' L iZS4 r s ;VIM A 9Pa Li ILEUM Mk. PWE a .0a0„, _ t - 'it. SPACING BETWEEN CHECK DAMS 1=R.?SIct9—L,QG DETAIL DiTCJ-L INST_ _-AT O.S From:Vlrgmla Sou and Water Conservation Commission. 1985 am 4Ja73.Y1 rocs WALL LL BL rout: &mw +ma w) :r+5 W1RL AND ROCK VARIES X NO 5•lOWN - i rOR C,ARITY \ 12" 'IN f"-------\-- . I `, _ "lam S::AL c _i .a 'ROCK SOCK ( I 3" EMBEDMENT SWALE ELEVATION 10" MIN ROCK SOCK~\ FLC'dr èJ L t 'L LEI+:L!: . SOCK 3" IN 5;i1_ \, --- X. EMBEDDED ROCK • SO::;‹ 3" IN Solt _ = THE DISTANCE SUCH THAT POINT A AND E ARE OF EQUAL ELEVATION. SWALE SPACING i/// / /i (JRss) ROCK SOCK IN SWALE 7 Construction Specifications • Install straw bale check dams, rock check dams, and other check dams according to Figure CD-1 , respectively. Other types of check dams shall have similar designs. • Check dams should be located in areas accessible to maintenance vehicles for the periodic removal of accumulated sediments. • Check dams should be installed with careful placement of the construction material. Mere dumping of the check dam material into a channel is not appropriate and will reduce overall effectiveness. • Check dams can be constructed from a number of different materials. Most commonly, they are made of straw bales or rock. When using rock, the material diameter should be four to eight inches depending on the expected velocity and quantity of runoff within the channel. Wattles or sand/gravel bags may also be used, but only if straw bales or rock is unavailable or is not feasible for the location. Earth collected during excavation of diversions or roadside ditches may also be placed as check dams if covered with erosion control blanketing. • All check dams should have a maximum height of three feet with sufficient space upslope from the barrier to allow ponding and to provide room for sediment storage. The center of the dam should be at least six inches lower than the edges. This design creates a weir effect that helps to channel flows away from the banks and prevent further erosion. • Additional stability can be achieved by implanting the dam material approximately six inches into the sides and bottom of the channel. • In order to be most effective, dams used in a series should be spaced such that the base of the upstream dam is at the same elevation as the top of the next downstream dam. • When installing more than one check dam in a channel, outlet erosion stabilization measures should be installed below the final dam in the series. Because this area is likely to be vulnerable to further erosion, riprap, erosion control blanket lining, or some other stabilization measure is highly recommended. Maintenance Considerations The frequency of inspections should be in accordance with the Stormwater Management Plan (S WMP). During inspection, large debris, trash, and leaves should be removed. The center of a check dam should always be lower than its edges. If erosion or heavy flows cause the edges of a dam to fall to a height equal to or below the height of the center, and the effectiveness of the check dam is compromised, repairs should be made immediately. Accumulated sediment should be removed from the upstream side of a check dam when the sediment has reached a height of the dam (measured at the center). Close attention should be made to the repair of damaged or rotting straw bales, end runs, and undercutting beneath bales. Replacement of bales should be accomplished promptly. 8 Removal Removal of check dams is optional. Check dams within roadside ditches are usually used as temporary controls, where other check dams may be left in place to silt-out. If removing a check dam, all accumulated sediment should be removed. Removal of a check dam should be completed only after the contributing drainage area has been completely stabilized. Permanent vegetation should replace areas from which rock or other material has been removed. References Colorado Department of Transportation (CDOT), Erosion Control and Stormwater Quality Guide. 2002. http://www.coloradodot.info/proszrams/env ironmental/water- quality/documents/erosion-storm-quality Environmental Protection Agency (EPA), National Pollutant Discharge Elimination System (NPDES). Construction Site Stormwater Runoff Control. Washington, D.C., February 2003 . http://cfpub.epa.gov/npdes/stormwater/menuofbmps/index.cfin Horizon Environmental Services, Inc, Guidance Document Reasonable and Prudent Practices for Stabilization (RAPPS) of Oil and Gas Construction Sites. April 2004. North Dakota Department of Health Division of Water Quality, A Guide to Temporary Erosion- Control Measures for Contractors, Designers and Inspectors, June 2001 • *Other materials may be used instead of straw. 9 Figure CD- 1 FIGURE CD-I Straw Bate Check Dam Installtian FLCP'Y ^18' K18' KWI in PIti5L Ewa 8'LEE •• L - ❑ErAHTE SLEH T}-1ST PONT.₹ C kin D APE E41µ1. ELEVITKR1 5TPdR—ti 113' K 18' }: 36" PR t STP. I DNE FLCO 4 - L 1 �Pt7e�T 0 574E— i-POINT n*' zy,y rlr k� POItlT' t r -� TPENK:H II •--POINT B* ^ L 4 Ind , LRUKILIE IC DU 4T LATE BEE'ME �i 8` SIN_ WHEN IT Rr2 19 CFE HAIR CF EPG6ED BALE HEIGHT' SGE COAL DEL ' II= POUT A MST RE H U I- R THAT POUT 9 1r ): 1 Pf }: ae Hfi1FS l'.usr BE TI[3 O' /f rrP CIL STRJ/# i mF'S PaTiD 41911-1t#7 CP$ k, ./' 1+1 41 c + STAKE ORRIN IFP TTS fir —1, Srt Ili LEAST 12P BC'N EL MIDE) 1 S •� �• E'AL3CFlLL MATERIAL `,% tt i%� , $t",:,<, (mWPitTT SDIL >k M4 in, '• .}'i .. TEI P�•grr T�Rr1) i2 _1 i .i. f Y+}� •7x_ > r t J 11``1 ?...s..• • :,407:t,,,,..-W"...\/ k,7.}r t "ti• 'N, ' . ::r T TES2 1 ETP11M F1;51FS 2HILL BE EERTF1ELL 4',D FREE. 2 9AKEB SHiilL E= 2' X r X ?ti" 'pica STMEB CR ET.A14DAM `r OR 'U•• STEEL PosTs. Fi i,IF- r4EDT TC r'V1 F 10 Figure CD-2 FIGURE CDC-2 Rock Check Dam Installation (Aerial View) . r r FLOW ■a►�a1ra s x 0 0 is it ROCK tIECK INW9 a arrarr aura■ I FIGURE CD-3 Rock Check Dam Installation (Ground View) TEF CF LINER ERFICIE CHEM Okii SHOULD EE LEVEL WITH ECOTCfi1 OF CHECK QNUPSURE SCALE ND 1U rata 11 Culvert (C) n �• I 1 w---ri0A 1/Illy /' = ": e,et/-, d{*c. 1 , •-' lv -,.'-d1: .: -1 ,'er 7•: ', • ,I ' ' '. :a1'a.. L . ' 1k ti - •v a� - ' • -- _r;t--- •'• - � r! e ti �-_ . t-' .' Description Culverts are typically concrete, steel, aluminum, or plastic pipe used to move ditch water under a road or to direct stream flow under the road or construction area. Applicability Culverts are ideal on roads with grades of less than 15%. For grades over 15%, it is difficult to slow down the water or remove it from road surface rapidly. On such steep grades, it is best to use frequently spaced relief culverts and drainage crossing culverts, with armored ditches (see RIPRAP [R]). Culverts may be used in the following applications: i • As drainage crossing culverts in streams and gullies to allow normal drainage to flow under the traveled way;. • As ditch relief culverts to periodically relieve the inside ditch line flow by piping water to the opposite side of the road where the flow can be dispersed away from the roadway. Culverts placed in natural drainages may be utilized for ditch relief Limitations • Undersized culverts are susceptible to plugging and will require cleaning. • Culverts will not filter sediment. • Culverts are easily crushed if not properly designed. Design Criteria Pipe size can be determined using general design criteria, such as in Table C- 1 , but is ideally based upon site-specific hydrologic analysis. 12 Depth The depth of culvert burial must be sufficient to ensure protection of the culvert barrel for the design life of the culvert. This requires anticipating the amount of material that may be lost to road use and erosion. Headwalls Use headwalls on culvert pipes as often as possible (see RETAINING WALL [RW]). The advantages of headwalls include: preventing large pipes from floating out of the ground when they plug; reducing the length of the pipe capacity; helping to funnel debris through the pipe; retaining the backfill material; and reducing the chances of culvert failure if it is overtopped. Construction Specifications Drainage crossing culverts • Make road crossings of natural drainages perpendicular to the drainage to minimize pipe length and area of disturbance (Figure C-1). • Use single large pipes versus multiple smaller diameter pipes to minimize plugging potential in most channels (unless roadway elevation is critical). In very broad channels, multiple pipes are desirable to maintain the natural flow spread across the channel. All culverts should be concrete corrugated metal pipe made of steel or aluminum, or properly bedded and backfilled corrugated plastic pipe. • Align culverts in the bottom and middle of the natural channel flowline so that installation causes no change in the stream alignment or stream bottom elevation. Culverts should not cause damming or pooling or increase stream velocities significantly. • Extend the outlet of the culvert at least one foot beyond the toe of the slope to prevent erosion of the fill material. Alternatively, use retaining walls (headwalls) to hold back the fill slope. • It may be necessary to install rip rap, erosion control blanketing, or a combination of both or other energy-dissipater device at the outlet end of the culvert to reduce soil erosion or to trap sediment (see CULVERT PROTECTION [CP]). • It may be desirable to construct pull offs/turnouts for vehicles on one or both sides of narrow culvert crossings. This will help avoid culvert crushing as well as disturbance to roadside ditches and berms. Ditch relief culverts See Figure C-2 for installation details. • Ditch relief culverts can provide better flow when skewed 0 to 30 degrees perpendicular to the road. • The culvert gradient should be at least 2% greater than the approach ditch gradient. This improves the flow hydraulics and reduces siltation and debris from plugging the culvert inlet. • Discharge the culvert at natural ground level where possible (see Figure C-3, type A), on firm, non-erosive soil or in rocky or bushy areas. If discharging on fill slopes, armor outlets with riprap or logging slash (see Figure C-3, type B), or use down-drain structures (see Figure C-3, type C and SLOPE DRAIN [SD]). 13 • Extend the inlet of the culvert at least one foot beyond the flowline of the roadside ditch. Extend the outlet of the culvert at least one foot beyond the toe slopes to prevent erosion of the fill material. • It may be necessary to install riprap or other energy-dissipater devices at the outlet end of the culvert to prevent soil erosion or to trap sediment (see CULVERT PROTECTION [CP])• • Spacing of culverts is dependent on the road gradient, soil types, and runoff characteristics according to the table below. Road Grade Soil Type 3-4% 5-8% 9-12% Highly Corrosive 240' 180' 140' Granitic or Sandy Intermediate Erosive Clay or 310' 260' 200' Load Low Erosive 400' 325' 250' Shale or Gravel • It may be desirable to construct pull offs/turnouts for vehicles on one or both sides of narrow culvert crossings. This will help avoid culvert crushing as well as disturbance to roadside ditches and berms. Backfill and compaction • Firmly compact well-graded fill material (soil or road base) around culverts, particularly around the bottom half, using placement in layers to achieve a uniform density. Use slightly plastic sandy gravel with fines. Avoid the use of fine sand and silt rich soils for bedding material because of their susceptibility to piping. Pay particular attention to culvert bedding and compaction around the haunches of the pipe. Do not allow the compaction to move or raise the pipe. In large fills, allow for settlement. • Cover the top of the metal and plastic culvert pipes with fill to a depth of at least one foot to prevent crushing by heavy trucks. Use a minimum cover of two feet of fill over concrete pipe. For maximum allowable fill height, follow the manufacturer' s recommendations. • Mound fill over the top of culvert pipes so the road is slightly raised at the culvert locations to help prevent erosion and water from ponding over culvert crossings. This practice, as well as placing large boulders around the culvert outlets, will also help to prevent culverts from being crushed. Maintenance Considerations The frequency of inspections should be in accordance with the Stormwater Management Plan (SWMP). If any damage to culvert or inlet/outlet protection is noted or if there is any evidence of scour, repairs should be made immediately. Any debris that may be blocking the culvert inlet or outlet should be removed. 14 References Horizon Environmental Services, Inc, Guidance Document Reasonable and Prudent practices for Stabilization (RAPPS) of Oil and Gas Construction Sites. April 2004. Keller, Gordon and James Sherar, Low- Volume Roads Engineering, Best Management Practices Field Guide. United States Department of Agriculture (USDA), Forest Service, US Agency of International Development (USAID), 2003. http://www.blm.gov/bmp/field%20guide.htm United States Department of the Interior and United States Department of Agriculture. Sur face Operating Standards and Guidelines for Oil and Gas Exploration and Development "Gold Book ". BLM/WO/ST-06/021+3071 . Bureau of Land Management (BLM). Denver, Colorado. Fourth Edition, 2006. • 15 Table C- 1 Size of Drainage Structure (diameter and area) Drainage Area (acres) Steep Slopes (Light Vegetation) Gentle Slopes (Heavy Vegetation) C=0.7 C=0.2 Round Pipe (In) Area (sq.ft) Round Pipe (In) Area (sq.ft) 0- 10 30" 4.9 18" 1 .8 10-20 42" 9.6 24" 3. 1 20-35 48" % 12.6 30" 4.9 35-75 72" 28.3 42" 9.6 75-125 84" % 38.5 48" 12.6 125-200 96" 50.3 60" 19.6 * Due to site specific conditions this table may not be used. Drainage Crossing Culvert Alignment & Overflow Dip - .I r '=1UTEL`I':'#1_ "' -l;� , : =,c,. . J ' a:J • . - ill 1!. . . ' . ..:r _ - £I✓r£9LELLI' -• . " 115T,.Rr••L5;;E . • • 2 r -- - ,,• • 4'4' .fr - F.• — `' - . • •'.�, ...• _ . - • -I. � .JC i - `..5� • 'rhThe {•.11:^ I -•...; . C r te!:!IV 7}Y- r E - v 'X:,t: . I— r< 7l fit •+' . ' . t: r" nw M.L.n: ram •nr-�:r • Ditch Relief Culvert Installation r '' -_- Mist pnlo tIX'•u ::ndad • • kITiv.,,, 118x7 ''•a '` i r.+xzrg a� '. I ;i�atillp t ��]C '! :xtot+C civet-TA least 7' +tr?arii • t _- r ifio Ituitti1ID CI'ID t'roadside Me1 •� - __ I \\`- Cllie:TI -`'l• ...a - .�i -Ii + W I • — F'llaiidCJaff.ta:a1;!'aode � { ti ' I •. a. I t bnynec inn at Napa • �f✓o -,,. I I {-- C;J $ ,'•-•r _ + � :�'i •'•''' ! •'a'•'' F&IF • ,r •P-•:,• � .':• + `,Y• • f\_` ,. ,r:a:-r,ti 'r'leur' elitpv et IlOI.mil Onirtfl ••+ •.. • '+ ,?: •+ �+''? ..--:.•a. - l • -:v.._;tv' .1s t , • I!, Ivan'a-rprayam•.ctitsoill ;ItcriMW .4_ •,:1• _ I{1 r. Nil'It.:1 Sat "•f• ,• C Culvert Installation Options TYPE A TYPE S • r t4irtral groind wcfroe Y4 P LI-In 1S°1. Cier}Y�iat . :'•'. 3.5ti .' '4•• .-c'+..e.,-. '• . • ' , f.• S., 4• ` -•. ,--.4.. ...,•• �` 'f:':i`e7. -C f 3 `c vir,.Fr fAk ••"4.4 . •'r- r4,-.. •- .-• .r.r.�h, •�... ...0.•,. . - f -:S . L.� 4';5'YN'4 c4 �' R IgtlT e7'`yr•].,.wit Y. • t Oi iztr: 'o3a ie,%yf1�,t2`'.i'.S r�- Win Mil I' 4ie �: 'S.i ti f'• - Yeti rock r tcp Odvssd - '!•'*•f' _ .�+•�! TYPE C •relcite b% f;; Cetrr ► F! Ancho:7 a Map*din n 2ba u:Ms Ftstroc -_�•:r ' T�4 ' with micas,able anchorMatt,off.. • .-• As Outtol pb ci ec-AY ..\:--......%".7-. Mle tuft rcnfp•hfJTTG8Cr11 E ...�— •• h' --j— — ----' — � Culvert B3ackfill and Compaction AI basal 1 IS•of WNW era"ss • MD 4'h4 cr dialer for iima r r:,Iw..6k. . u2tt ctwr.hx �!{�-�r;7pt::r Q47'3.r�dl`. Y` — ..tl6�4tl16 pIQ0.—_n_____..._.r _._. _ _ _____._ . . __, ._._• . .._. ___ _.____ _... _ . . . . '. •ri 9.44 3r1 , -/„.7.:,.::•�,...,:•:::•;•, .,./. .4 r r� j ti , -- -�. . • 1';;, •..,.. �.- . , • 1 • ''1 -1i!mp becktl met e:el al •I r'• • f�..tipguata+i?teivBlR IdAfs$" 9aih me NtaVapjfii rtutltrall ' '.l-�' :%/�•'.•'. • shadd tat aanpic .Crmpr •• ,,x'. Lie fit a int-aum amai Wyatt - . 4`•—• land ofnalumial,u&rttas ii'amnrocnrr cacti ski; al the wham . Grasmi Q=41 elicit bat (r(J-tQek giver!hart 31 h:3TTO saALE 1 Culvert Protection (CP) C • - • t .t_ tim N . aft b.`'� 4- per ___4..� .� ��r4t�- • Ft-a_ I I‘ ' ai- :11Sit 4:7t gat + . .1 �A C _', lam, _ Description Culvert protection may be required at the inlet (upstream side) of the culvert and/or the outlet side of the culvert (downstream side). Culvert inlet protection could involve placing boulders, riprap, gabions, rock retaining walls, slash, and/or any other protection at the inlet pipes. Riprap, or other energy-dissipating devices, will reduce the velocity of stormwater flows and thereby prevent erosion and help protect the inlet structure. Culvert outlet protection involves placing structurally lined aprons or other appropriate energy- dissipating devices, such as large boulders or plunge pools, at the outlets of the pipes to reduce the velocity of stormwater flows and thereby preventing scouring at stormwater outlets, protecting the outlet structure, and minimizing the potential for erosion downstream. Applicability Riprap inlet protection should be used where velocities and energies at the inlets of culverts are sufficient to erode the inlet structure. Riprap may also be used to help channel the stormwater to the inlet of the culvert. Culvert outlet protection should be used where discharge velocities and energies at the outlets of the culverts or channels are sufficient to erode the next downstream reach. Limitations Rock aprons at the culvert outlets should not be placed on slopes steeper than 10 percent. Runoff from pipe outlets at the top of cut/fills or on slopes steeper than 10 percent should be routed via slope drains or riprap chutes to a rock apron at the toe of the slope. Otherwise, the flow will re- concentrate and gain velocity as the flow leaves the apron. Design Criteria Culvert Inlet protection : Riprap, gabions, or rock retaining walls at culvert inlets shall be designed according to RIPRAP (R) or RETAINING WALL (RW). Culvert Outlet protection: Gabions or rock retaining walls at culvert outlets shall be designed according to RETAINING WALL (RW). No formal design is required for plunge pools at outlets. 19 Tail-water Depth : The depth of tail-water immediately below the pipe outlet must be determined for the design capacity of the pipe. If the tail-water depth is less than half the diameter of the outlet pipe, and the receiving stream is wide enough to accept divergence of the flow, it shall be classified as a minimum tail-water condition. If the tail-water depth is greater than half the pipe diameter and the receiving stream will continue to confine the flow, it shall be classified as a maximum tail-water condition. Pipes out-letting onto flat areas with no defined channel may be assumed to have a minimum tail-water condition. Riprap Apron Size and D50 size: The apron length (LA) and the D50 size of the riprap shall be determined from Table CP-1 according to the design flow and whether there is a minimum or maximum tail-water condition. The apron width (W) shall then be determined as (W=d+0.4LA) where d is the diameter of the culvert. If the pipe discharges directly into a well-defined channel, the apron shall extend across the channel bottom and up the channel banks to an elevation one foot above the maximum tail-water depth or to the top of the bank, whichever is less. The upstream end of the apron, adjacent to the pipe, shall have a width of two (2) times the diameter of the outlet pipe. Riprap Materials: The outlet protection may be done using rock riprap or grouted riprap. Riprap shall be composed of a well-graded mixture of stone size such that 50 percent of the pieces, by weight, shall be larger than the D50 size determined from Table CP-1 . A well-graded mixture, as used herein, is defined as a mixture composed primarily of larger stone sizes, but with a sufficient mixture of other sizes to fill the smaller voids between the stones. The diameter of the largest stone size in such a mixture shall be 1 .5 times the D50 size. All grout for grouted riprap must be one part Portland cement for every three parts sand, mixed thoroughly with water. Filter: If a filter cloth or gravel is used, it should be designed according to RIPRAP (R). Apron Thickness: The minimum thickness of the riprap layer shall be 1 .5 times the maximum stone diameter for a D5o of 15 inches or less and 1 .2 times the maximum stone size for a D5o greater than 15 inches. Riprap Stone Quality: Stone for riprap shall consist of field stone or rough un-hewn quarry stone. The stone shall be hard and angular and of a quality that will not disintegrate with exposure to water or weathering. The specific gravity of the individual stone shall be at least 2.5 . Site rock or site boulders may be used providing it has a density of at least 150 pounds per cubic foot and does not have any exposed steel or reinforcing bars. 20 Construction Specifications Culvert Inlet Protection 1. Riprap, gabions, or rock retaining walls at culvert inlets shall be constructed in accordance to RIPRAP (R) or RETAINING WALL (RW). 2. After installation of a culvert, examine the stream channel for the amount of debris, logs, and brushy vegetation present. In channels with large amounts of debris, consider using oversized pipes. 3. Boulder should be dry-stacked around the culvert inlet and up the slope to the edge of the road. Culvert Outlet Protection Gabions or rock retaining walls at culvert outlets shall be designed according to RETAINING WALL (RW). Riprap aprons at culvert outlets shall be constructed according to CP-2 and as follows. • Prepare the sub-grade for the riprap to the required lines and grades. Any fill required in the sub-grade shall be compacted to a density of approximately that of the surrounding undisturbed material. • If a pipe discharges into a well-defined channel, the channel' s side slopes may not be steeper than 2: 1 . • Construct the apron to the design length and width with no slope The invert elevations must be equal at the receiving channel and the apron's downstream end. No over-fall at the end of the apron is allowed. The elevation of the downstream culvert outlet and of the apron shall be equal to the elevation of the receiving channel or adjacent ground. The outlet protection apron shall be located so there are no bends in the horizontal alignment. • Line the apron with riprap, grouted riprap, or concrete. Riprap should be the appropriate size thickness and design. See RIPRAP (R) for the placement of riprap. • If a culvert outlet discharges at the top of cut/fills or on slopes steeper than 10%, one of the following options is suggested. • Transition the culvert to a slope drain according to SLOPE DRAIN (SD). The slope drain shall convey stormwater to the bottom of the slope where the riprap apron, as designed above, shall prevent erosion at the slope drain outlet. • Line the slope below the culvert outlet with a riprap channel to convey stormwater to the bottom of the slope where a riprap apron, as designed above, shall prevent erosion at the bottom of the slope. The riprap channel shall be designed according to the table in the RIPRAP (R) construction specification that is based on depth of flow and slope. The riprap channel shall dip into the slope such that all water is contained within the channel, flows to the riprap outlet apron at the base of the slope, and does not spill over the sides onto unprotected soil. 21 Maintenance Considerations The frequency of inspections should be in accordance with the Stormwater Management Plan (SWMP). Inspect for debris at the entrance to culverts and within culverts. Inspect riprap at culvert inlets for damage and dislodged stones. The maintenance needs are usually very low for properly installed riprap aprons at culvert outlets. However, inspect for evidence of scour beneath riprap at outlet aprons or for dislodged stones. Anything that is found to reduce the effectiveness of the culvert or culvert outlet protection should be repaired immediately. References Keller, Gordon and James Sherar, Low- Volume Roads Engineering, Best Management Practices Field Guide. United States Department of Agriculture (USDA), Forest Service, US Agency of International Development (USAID), 2003 . hap://www.bim.gov/bmp/field%20guide.htm New York State Department of Environmental Conservation, New York Guidelines for Erosion and Sediment Control. New York. August 2005 . http://www.dec.ny.gov/chemical/29066.html 22 Table CP- 1 Riprap Aprons for Low Tailwater (downstream flow depth < 0.5 x pipe diameter) Culvert Lowest Value Intermediate values to interpolate from Highest Value Diameter Q LA Dso Q LA D50 Q LA Dso Q LA Dso Q LA Dso Cfs Ft In Cfs _ Ft In Cfs Ft In Cfs _ Ft In Cfs Ft In 12" 4 7 2.5 6 10 3 .5 9 131 6 12 16 7 14 17 8 .5 15" 6.5 8 _ 3 10 12 5 15 16 7 20 18 10 25 20 12 18" 10 9 3 .5 15 14 5.5 20 17 7 30 22 11 40 25 14 21 " 15 11 4 25 18 7 35 22 10 45 26 13 60 29 18 24" 21 13 5 35 20 8.5 50 26 12 65 30 16 80 33 19 27" 27 14 5 .5 50 24 9.5 70 29 14 90 34 18 110 37 22 30" 36 16 6 60 25 9.5 90 33 15 .5 120 38 20 140 41 24 36" 56 20 7 100 32 13 140 40 18 180 45 23 220 50 28 42" 82 22 8.5 120 32 12 160 39 17 200 45 20 260 _ 52 26 48" 120 26 10 170 37 _ 14 220 46 19 270 54 23 320 _ 64 37 Riprap Aprons for High Tailwater (downstream flow depth > 0.5 x pipe diameter) Lowest Value Intermediate values to interpolate from Highest Value Culvert Diameter Q LA Dso Q LA Dso Q LA Dso Q LA D50 Q LA Dso Cfs Ft In Cfs Ft In Cfs Ft In Cfs Ft In Cfs Ft In 12" 4 8 2 _ 6 18 2.5 9 28 4.5 12 36 7 14 40 8 15" 7 8 2 10 20 2.5 15 34 5 ` 20 42 7.5 25 50 10 18" 10 8 2 15 22 3 20 34 5 30 50 9 40 60 11 21 " 15 8 2 25 32 4.5 35 48 7 45 58 11 60 72 14 24" 20 8 2 35 36 5 50 55 8.5 65 68 12 80 80 15 27" 27 10 2 50 41 6 70 58 10 _ 90 70 14 110 82 17 30" 36 11 2 60 42 6 90 64 11 120 80 15 140 90 18 36" 56 13 2.5 100 60 7 r140 85 13 180 104 18 220 120_ 23 42" 82 15 2.5 120 50 6 160 75 10 200 96 14 260 120 19 48" 120 20 2.5 170 _ 58 _ 7 220 85 12 270 105 16 320 120 20 23 Figure CP- 1 Typical Inlet Protect9on .. Veirt _._f - -•_.. l'Na- „rnMoG ctlloo cit om / .. OC•ts-ilmroe•tt • .._ _. - .� •., '4t ••,r1.. .a -w 5-fr.1. -,...,c1 .. •-Nr'•a•••�.. • - - ' f •• „4. "•.i.,w..P• at •.-•• .•.f-. ^7.—. -r - --4P-• .` r. '•- •.MIJtdfl�a al!nh• .—_ _ _ •'1 _.+-.• ;..j•i+, t1�y1•,•• • -- 1:10valtratii. ' E..i • . RilnaA 01/410• • - Wankel lEl`tt} Typical Outlet Protection ��. .-- .. .—.Lr...cur....��....N•�VVNN•r_�-.._..-_...��.�... �_...•....�...�. ....Ir.w.w...•wl.,..v.vw..,nM.��4—.��.. I•N I..T.A.nM_ml.w.�v-'� 7�", , -ti�--�� A t s-- w= d+Q.d la �' ` le 4 `^(�' +i ...�'�,&Mal citron 11 ran, ;; ,� , •r � p}�_ '` •. and bo of eltpa. •fir:' ,�'-_ ,' `iji"? { -'�}:1;'j: t..�-7".ry�r;ez., or12MtPm ';^;.ti, . .,•, .f la 1u,, v. x . 2, 1 4. �y:•,..,:,...„4,40. ....;:.,,q,„I:E•: '1•i J'.fa• 1 r Cr:^-'"i 5L•.14; `' .r:•:1..ai•ai'.:..,jo. •r K A"v`v9 s J= 4' . / 1 1 7. �, A1� 11 .14 Irk 24 �. ,f • , Slur R'MT CiCth -t 3t3ti,�'a�s'rc:1ti: 'K`vt.�•t �_�.r•'ft_ra�iti� �'yt_, 1 y p•t� 1$1• ill ..•'t.•H y. %i1.1• yr ►. •y i.1 {••r •f t'1,..-4-1-y. iii' " fm.•3� ti•� . rrrr Lii$l:.t' t : •� fore' y > -' a- ..� 7 rl . �*1 ri 1 •_sr.r,. Ct �r �1iZa�• it�.ri fv..•t'� j, I.ti... r• it ;. • ZTIL'r'.�+y� r • 'A1�et r;w2�1-{-2•54.,f41..;87,1 i;F'Lh1'/ 1..I •f'• t -1 t;.:•T';M:r..'Aw�r•�a. •SC.ni�l�•7Mt�1.i �it}i741..� �i~it ^l. 1. t c y.t+:r..y. .. t s. , `•y+ fry' 7` t g,t. V_f L..Ya rti V. :.e t• t 1r • = f •4 LS6-h4114,w it ii,.is:,-1.:1 tzti '' �^_':zztctl•'•2• t. 4,i. Y..• rim'..C '^J�' . ;s -L iJ !f�`r''i'f+E s 32.ae:�s L:c•ti'�'.. ,y _r 3`m111, A ' •v Ij 1 .•1 V ~ 11.•.410: T :IiNo-'•� :Se 44. f7Cnr c Liter cat) :c,f:(I''Ll.r ; 'ri Zt k.�,i Tate4" ii i rn kettabo, �. • 24 Figure CP-2 FIGURE Typical Gullet ' ctAtm rAtCHWAE DQyR CRUM 1' a Olsen' BEIM 1OE OF LOPE w sat as IA I elf .1 "I ‘I-ir • ir 'ail rig akta T•-_� (( '*. -:•WX :......„•-•••.,7 oft La 11�. Yom•. .1 r _••i ra f��LJ •"• ~•f .s=.aliP te•►. •... .r:.r;:;,y:•1 4< O- —EED y �1• E Ann Ollt !UM...... •.ice`• •••••••••••••••••.,:-.-1-:•...-"te` �V'.:•.7≥ r'ii'••R M"' .•Ai'` i. .•/:`^:A: ;. •;-i.. MEND�,eq1� ,y � •fiA r••O. rt;fi:• " • .+.':_�.•�. r•';• MU 'f�OIIR .1.v fA�tT✓;••••r�}•'•:. e .• "� ti..4.•10•••,. yj` j. • YII1.1•i • CDPOO4r Etta WA' 'RI firatE 25 Discharge Trench (DT) t rteas 1:. 44, E It, ;• i. ' y L;1 µ q volt • a I �. • ' • } - ' If a _ - - 4th' i • ♦ • ? 1 • . ''lli. v •;, `C r . 4 se Description and Purpose A small excavation (trough/trench) generally constructed near a drilling rig or tanks to collect potential pollutant sources. Suitable Applications Discharge trench control BMPs during the following construction activities: • Secondary containment; and • Rig washing and other drilling activities. Limitations • Containment volume; and • Potential for subsurface pollution due to infiltration. Design Criteria All discharge trenches shall be designed to control small amounts of non-stormwater discharges, such as rig washing, and use as a secondary containment barrier. Construction Specifications The trench should be of adequate size to contain and/or slow potential pollution sources from discharging the construction site. 26 Maintenance Considerations The frequency of inspections should be in accordance with the Storm Water Management Plan (SWMP). Discharge trenches should be inspected for evidence of areas of collapse and available capacity to ensure continued effectiveness. Material should be excavated from the discharge trench in the event of a collapse. Liquids should be pumped to a container when the trench is more than two-thirds full. Removal Discharge trenches should remain in place while the drill rig is present. Once the rig is removed, the discharge trenches can be de-constructed and the removal of any stained soil will be removed with it. 27 Ditch (D) -t. Description A ditch consists of a channel constructed across a slope to collect and divert runoff. The earthen channel may remain bare, or when necessary to protect it from erosion, it may be vegetated. The purpose of this practice is to divert surface water from one area to other areas for use or safe disposal. Applicability Ditches are usually appropriate where runoff can be diverted and disposed of safely to prevent flood damage, erosion, or sedimentation damage. Specific locations and conditions include: • Above steep slopes to limit surface runoff onto the slope; • Across long slopes to reduce slope length to prevent erosion; • Below steep grades where flooding, seepage, or sediment depositions may occur; and • Around buildings or areas that are subject to damage from runoff Limitations A ditch is an effective means of diverting sediment laden runoff around a disturbed area. A ditch can sometimes, if not properly constructed, concentrate runoff in the ditch and increase the erosion potential. The effectiveness of a ditch can be greatly reduced if the ditch crosses a vehicle roadway or entrance. It is recommended that a ditch be coupled with a sediment trapping device at the outfall of the ditch. Design Criteria A ditch shall have enough capacity to carry peak runoff. The ditch may be parabolic, V-shaped, or trapezoidal in shape. A ditch may be designed to deliver runoff to a stable outlet at a point where the outflow will not cause damage. 28 Construction Specifications • All trees, brush, stumps, obstructions, and other objectionable material shall be removed and disposed of so as not to interfere with the proper functioning of the ditch. • All ditches shall have uninterrupted positive grade to an outlet. • Diverted runoff from a disturbed or undisturbed area shall outlet to a sediment trapping device or into an undisturbed stabilized area at non-erosive velocities. Vegetative outlets shall be installed before ditch construction, if needed, to ensure establishment of vegetative cover in the outlet channel. Maintenance Considerations The frequency of inspections should be in accordance with the Stormwater Management Plan (SWMP). Ditches should be cleared of any sediment and repairs completed when necessary. Maintenance efforts should be adequate to preserve ditch capacity. Removal The ditch shall remain in place only until the disturbed areas are re-graded and prepared for permanent stabilization. References United States Environmental Protection Agency (EPA), National Pollutant Discharge Elimination System (NPDES). Construction Site Stormwater Runoff Control. Washington, D.C., February, 2003 . http://cfpub.epa.gov/npdes/stormwater/menuofbmps/index.cfm New York State Department of Environmental Conservation, New York Guidelines for Erosion and Sediment Control. New York. August 2005. http://www.dec.nv.gov/chemical/29066.html 29 ezi I- a W b of.. v.. .� .,A 41•1444.4•44%;t <� b✓6 '.. /., e�t/d%dd�o 4d�dad• ,�Q V$ kko 1nb.°nb.PwQ?nh�c'w-• IPS,•dw dr. tel.dq'd- >•r• ti404�pcAS. I d JtY<�Jti�J�e"- 'dppeaqqa%p '/t <' &- �'°�d'��,9'J'0' d�- tr•'•O4.O k d.i•at t r hw+' ap.a°a'K' i vsteo,dp dq•d- w 7 ' .47 '``4“`4�'•` + ' AAA a w �_ • y�'i,rT.‘Gq,Grc'G- 1 .csahahahAA „.„0.4v.44,447.0.... .; �o6y6aG$a,vaGka�_ .1.: ,- �w'Nw' . A*t /-. ,"� .vc..:,C :..9 d :d dOOe+at.d e :. .-v<..vc.•v<vv<y.+ J'0®ego ooh •ve4.;9•0.4.v t*) ':▪ • : •d�d°da d dv d . • Tice. d. d d'•4 ▪ • q.Q>b@>Ao`p . •• °q'Ya o46'WS'�.t r..- ••'• �. '• .4/4.4,v C W da�Pd�v PV?•240-....:47,•<4..." dr,•dk•V '•. • >.Z >. >. ?.. '.; .. : a o P P •'•, d Ndddo'ddd- Q.e �'ojt. .4 qk4 - '' '• .A trA• A°.A4'qY fr I•':. .A«ha AAoa�.A a▪.':. . °P°S.t•� 'r9Gr:I�i�'°°- r. ,' o"%.}�ogp>cy%o�o�yyipq•°.�'- • �•. ::'ho w' A•.••4.ves '.•. . •• >a.<caawahwhh- .>; .. .?dmgr'�cafv�fP cG. . . • >p.�o•�oChha wh•N Awt '• . ., >a ,�kr 4 o�j+rv`daPa. a• `'>e�•GeG..r'G4 ' • kr'r�..r�r..p`r.an�t� '''.�. \-.AJC'pOaLC�aGrAaC<letr ' ••••8: vti'44:0,4Wir4�}°S�qa��. • f`b�•:a6' >e a +. +,: ' -; r,d�.dd dddd✓d 4 t . ' o-.9 P P d a . ':•'fd. d.•dr:d..•da'd- �' ;,•:� <>@a'��e�ye�e . • • >se O et�'0er°O'�k e• _' {i>yQ dPNd•y'.r 8t/yd.. .•,M1 • 4�b«' yyr.�dp,Q+°k�4. .•-- /4:40%.-4,40•449: *eV sd •. . 4lddd.Yor7 Np`dq•N- •. .`;"'"S�+\1`f•S•1 4i a°n•��-a'//��Sa�s?)g�A • k...,:50.4.49.014,-0:74%v •3'P'yP'q.4'k.(1.4.P'<•ra" +•:4AAAAy;'oh" R4.Ac(.. �Oq aaoGac�aGgG a.wKaAAAAAAA� V •;,. 4. 4. s.O�a2r°P`Qe4'• Nr47, �e�34GabGe,�i M n_•✓�'✓v:,/vcv:J.r..e �Q Gq. .4,f� A; Q • O P P « ti 3 >t..dw:dw:dr:d O�a�e�o�e', �d; � dCI g W IIU am. ee��ddA0°dd°d:ire IL it Awa`st a. ma° AJa s \es.;;\.:004,4s::::34Eii 49.. IL9�acgq r «d O`4✓ ! re w • oa4tS,• da dd r•WQ•k� - ..4.47 .aA�h �Gk�a° +GAet' a;itb�r 'r49e #•>•:;G`t:i, • Pee a,�'a 'ddddddJ'd- �a�a4. �oAy. � P• d@dddddddd• Q, to 8 k h d P O e• q>veQ>a �a s`c"A�P. 4114.4%,44/4:410• ddd dL dry dq d- a'b°b°AteSte'>41'>°>S:. °a t'oY2Q`�ii��aaa4k+ ,a- e'd+ordk.ddddddnrd- 'dd✓dy atilvtOvOrq d- AA`hAaA A4.A6'Ax• ww°An AwSWer '+.4.aaaAd 9e°�OoGkef/Q '�J"�- G,yPG�d�ydaGoo�sa gay4_ d.4.AA Ar o. e. Aa. w$Ao:AaAwAAAw' 9a°Go°�o�90 °4$°3' dr. r .w4cawww).w,,.A: 30 Ditch and Berm (DB) . I, . g :41 O s - :. •, :: TH a: T. 4 , ., . - , , , 1 , k aq „ I ,I,4 4 , , J1 - i:. Li Ft , - 4 i ; i .. :,,, i i j I l 4 '. 1 I I it 1 1 1 ;� � r ' 1. 11. -. . $ .. _.._ �, a►+i. I ' :, ' ' 1 'if- c, 1�II 1 'aft •z •^ . r yy ..M1:144//. a.i 7' .� r p, T7�w H �11 - ilefnirsatio Definition A ditch and berm is a drainage with a parabolic or trapezoidal cross-section and a supporting ridge on the lower side that is constructed across the slope. The purpose of a ditch and berm is to prevent off-site stormwater runoff from entering a disturbed area, to prevent sediment laden storm runoff from leaving the construction site or disturbed area, to prevent flows from eroding slopes, and to direct sediment laden flows to a trapping device. Applicability Ditch and berms may be designed for temporary or permanent use. The maximum drainage area for a temporary, un-compacted ditch and berm is two acres. For drainage areas larger than two acres but less than ten acres, the ditch and berm should be compacted. For undisturbed drainage areas larger than ten acres, a permanent ditch and berm may be designed to handle larger flows. Ditch and berms may be used for: • The up slope of cut or fill slopes to convey or divert flows away from disturbed areas; • The down slope of cut or fill slopes to divert on-site runoff to a stabilized outlet or sediment trapping device; • At the outer edge of a well pad to ensure that runoff remains on the pad and is diverted to a well pad detention pond, if available; • Where runoff from higher areas has potential for causing erosions, or interfering with, or preventing the establishment of vegetation on lower areas; • Where the length of slopes need to be reduced so soil loss will be kept to a minimum; and • At the perimeter of a site or disturbed area. Limitations • The area around the ditch and berm that is disturbed by its construction must be stabilized (with vegetation or other erosion control) so it is not subject to similar erosion as the steep slope the channel is built to protect. • To alleviate erosion capability, ditch and berms must be directed into a stabilized outlet or well-vegetated area or to sediment trapping devices, where erosion sediment can be settled out of the runoff before being discharged into surface waters. • Temporary ditch and berms should be designed to avoid crossing vehicle pathways. • Ditch and berms should be used with caution on soils subject to slippage. 31 Design Criteria For a temporary ditch and berm (drainage less than 10 acres), no formal design is necessary. For permanent ditch and berms (drainage area larger than 10 acres), the following guidelines apply. Location Ditch and berms are usually located above or below cut or fill slopes. Exact ditch and berm location shall be determined by considering outlet conditions, topography, land use, soil type, length of slope, and the development layout. Where possible on shallow slopes, a vegetative buffer strip should be left between the edge of the cut or fill slope and the ditch and berm. See VEGETATIVE BUFFER (VB). Capacity The constructed ditch and berm shall have the capacity to carry, as a minimum, the peak discharge from a 10-year frequency rainfall event with the freeboard of not less than 0.3 feet. Cross section See Figure DB-2 for details. The ditch and berm shall be parabolic or trapezoidal in shape, if possible. The ditch and berm shall be designed to have stable side slopes. The side slopes shall not be steeper than 2: 1 and shall be flat enough to ensure ease of maintenance of the ditch and berm. The ridge shall have a minimum width of 4 feet at the design water elevation, a minimum of 0.3 feet freeboard, and a reasonable settlement factor (10%) shall be provided. Velocity and grade The permissible velocity for the specific soil type will determine the maximum grade. The maximum permissible velocity for sand and silt channels is 3 feet per second, and 5 feet per second for clay vegetated channels. Ditch and berms are usually not applicable below high sediment producing areas unless structural measures, designed to prevent damaging accumulations of sediment in the channels, are installed with or before the ditch and berm. 32 Construction Specifications General • All trees, brush, stumps, obstructions, and other objectionable material shall be removed and disposed of so as not to interfere with the proper functioning of the ditch and berm. • All ditch and berms shall have uninterrupted positive grade to an outlet. • Diverted runoff from a disturbed area shall be conveyed to a sediment trapping device. Diverted runoff from an undisturbed area shall outlet to a sediment trapping device or into an undisturbed stabilized area at non-erosive velocities. Vegetative outlets shall be installed before ditch and berm construction, if needed, to ensure establishment of vegetative cover in the outlet channel. Temporary ditch and berm (drainage area < 10 acres) • The ditch and berm shall be excavated or shaped to line, grade, and cross section as required to meet the specific criteria. The ditch and berm does not need to be compacted if the contributing drainage area is less than 2 acres. • Stabilization with vegetation is not required as long as sediment traps (see SEDIMENT TRAPS [ST]) or other sediment control devices are provided. Permanent ditch and berm (drainage area > 10 acres) See Figure D-2 for details. • The ditch and berm shall be excavated or shaped to line, grade, and cross section as required to meet the specific criteria specified herein, and be free of bank projection or other irregularities that will impede normal flow. • Parabolic and triangular-shaped, grass lined channels should not have a top width of more than 30 feet. Trapezoidal, grass lined channels may not have a bottom width of more than 15 feet unless there are multiple or divided waterways and have a riprap center or provides other methods of controlling the meandering of low flows. • If grass-lined channels have a base flow, a stone center or subsurface drain or another method for managing the base flow must be provided. • Fills shall be compacted as needed to prevent unequal settlement that would cause damage in the completed ditch and berm. • All earth that is removed and not needed in the construction shall be spread or disposed of on the well pad side so it will not interfere with the functioning of the ditch and berm. • Immediately after the ridge and channel are constructed, they must be seeded or hydro- seeded and mulched or covered with erosion control blanketing according to SEEDING (S) and MULCHING (M) or EROSION CONTROL BLANKET (ECB) along with any disturbed areas that drain into the ditch and berm. • For design velocities less than 3 .5 feet per second, seeding and mulching may be used for establishing vegetation. It is recommended that, when conditions permit, temporary ditch and berms or other means should be used to prevent water from entering during the establishment of vegetation. • For design velocities more than 3.5 feet per second, the ditch and berm shall be stabilized with seeding protected by jute or matting or with seeding and mulching, including temporary ditch and berms, until the vegetation is established. 33 Maintenance Considerations The frequency of inspections should be in accordance with the Stormwater Management Plan (SWMP). Channels should be cleared of sediment and repairs made when necessary. Maintain ditch and berm capacity, ridge height, especially if high-sediment yielding areas are in the drainage area above the ditch and berm. Redistribute the sediment as necessary to maintain the capacity of the ditch and berm. Removal Temporary and un-compacted ditch and berms shall remain in place only until the disturbed areas are re-graded and prepared for permanent stabilization. Permanent ditch and berms shell remain in place until final reclamation. References United States Environmental Protection Agency (EPA), National Pollutant Discharge Elimination System (NPDES). Construction Site Stormwater Runoff Control. Washington, D.C., February, 2003 . http://cfpub.epa.gov/npdes/stormwater/menuofbmps/index.cfin New York State Department of Environmental Conservation, New York Guidelines for Erosion and Sediment Control. New York. August 2005 . http://www.dec.ny.gov/chemical/29066.html United States Department of Agriculture (USDA), Natural Resources Conservation Services (MRCS), Field Office Technical Guide. 2002. http://www.nrcs.usda.gov/technical/efotg/ 34 RI 9 4 Er ate.❑ (w®W. 9knit: r K 4 pi pc-P CI 1 i�I it ii�R w 1' 1 1-I ^? ... . p I�il 0 f. G ca tri) ''" -' a .rd .,_,,ry pa C :' . C t 1 .kti'�t. U 0 u I I 4O: r I r�'f'i s sa I r rC dl 0 i I yti4,, 1$ ac N 4• L, .. 8 C 5 d 1 .. O 0 i ap.ct, st IIa' 1 hv'n . a. p1 1 Y. 35 Erosion Control Blanket (ECB) Ir, ft . . / . r .. ..t. ; :. . t 1 • . ` • ' .-• , f 2 !do!e., . - `. • f-. ` :tea�•e- . .. tart:i.rL1,' eçC ' ' i4e "it ,{'I� ri .. }. fi. r :;-::.14 era o, icAte,4:,-. ' - -. / . :t 1-:_ t ,_;.•;:_:. 7)4,:z -liq,, ... : . ... - de ,__,- . $7-1.4„61 m _erJatizm 4.01te-i p - � 'ray • it. 1 ) e, •L � -• i^�.r- r, • jA 3�te: it y • terifiSIL-Irser*:Pc A t: •11-1/4:,1 Description Erosion control blankets, also called turf reinforcement mats (TRM), are porous fabrics and are manufactured by weaving or bonding fibers made from organic or synthetic materials. Erosion control blankets are installed on steep slopes, over berms, or in channels to prevent erosion until final vegetation is established. However, blankets can also be used as separators or to aid in plant growth by holding seeds, fertilizers, and topsoil in place. Applicability Erosion control blankets may be used in the following applications: • To control erosion on steep slopes and to promote the establishment of vegetation; • To stabilize channels against erosion from concentrated flows; • To protect berms and diversions prior to the establishment of vegetation; • To protect exposed soils immediately and temporarily, such as when active piles of soil are left overnight; • As a separator between riprap and soil to prevent soil from being eroded from beneath the riprap and to maintain the riprap's base; and • May be used on slopes as steep as 1 : 1 . Limitations • Blankets used on slopes should be biodegradable or photodegradable, non-toxic to vegetation or germination of seed, and non-toxic or injurious to humans. • Should not be used on slopes where vegetation is already established. • Some blankets might promote increased runoff and might blow away if not firmly anchored. • If the fabric is not properly selected, designed, or installed, the effectiveness may be reduced drastically. Manufacturer' s specifications should be followed. 36 Design Criteria There are many types of erosion control blankets available. Therefore, the selected fabric should match its purpose. Effective netting and matting require firm, continuous contact between the material and the soil. If there is no contact, the material will not hold the soil and erosion will occur underneath the material. Table ECB-1 indicates some recommended criteria for the selection of erosion control blankets. Construction Specifications • Smooth soil prior to installation and apply seed prior to fabric installation for stabilization of construction sites. • Select the appropriate fabric type using the guidelines from Table ECB- 1 . • Installation of the blankets shall be in accordance with the manufacturer's recommendations and according to Figure ECB- 1 . For blankets being placed in channels, the fabric should be rolled out parallel to the channel if the width is sufficient to cover the entire width of the channel. The fabric needs to be in continuous contact with the exposed soil. • Pins or staples shall be made of wire 0. 162 inches or larger in diameter. "U" shaped staples shall have legs 8 inches long and a 1 inch crown. The bar of the "T" shall be at least 4 inches long. Triangular survey stakes can also be used. Maintenance Considerations The frequency of inspections should be in accordance with the Stormwater Management Plan (SWMP). Inspections should determine if cracks, tears, or breaches have formed in the fabric. If the effectiveness of the erosion control blanket has been reduced, the fabric should be repaired or replaced immediately. Re-anchor loosened matting and replace missing matting and staple as required. It is necessary to maintain contact between the ground and the blanket at all times. Trapped sediment should be removed after each storm event. References Environmental Protection Agency (EPA), National Pollutant Discharge Elimination System (NPDES). Construction Site Stormwater Runoff Control. Washington, D.C., February 2003 . http://cfpub.epa.gov/npdes/stormwater/menuofbmps/index.cfm Horizon Environmental Services, Inc, Guidance Document Reasonable and Prudent Practices for Stabilization (RAPPS) of Oil and Gas Construction Sites. April 2004. Keller, Gordon and James Sherar, Low- Volume Roads Engineering, Best Management Practices Field Guide. United States Department of Agriculture (USDA), Forest Service, US Agency of International Development (USAID), 2005 . http://www.blm.gov/bmp/field%20guide.htm North American Green, 2004. http://www.nagreen.com 37 Table ECB- 1 Table ECB-1 Suggested Blanket Types Max. Flow Description Lantevity Applications Velocity (feet/sec) Single Net Stew Blanket ' 12 months 4:1 - at Slopes a Low Flow Channels I i Rapid Degrading Net 45 - 60 4. 1 - 3.1 Slopes 5 Days Low Flow Channels Double Net Straw Blanket 12 months 3:1 • 2.1 Slopes Moderate Flow Channels Rapid Degrading Nets 45 - 60 3:1 - 2:1 Slopes 6 Days ( Moderate Flow Channels Double Net Blanket 24 months i 2:1 - 1.1 Slopes 8 70% Straw/30% Coconut Medium Flow Channels Double Net Blanket 36 months 1 1 . 1 & Greater Slopes 10 100% Coconut High Flow Channels Double Net Blanket 1.1 Slopes 9 (unveg j Polypropylene Fiber Extended Flow Areas 16 (veg ) / High Flow Channels 1 Organic Net 12 month— ss$ 4:1 - 3:1 Slopes j 5 Low Flow Channels . Organic Nets 12 months 3:1 - 2:1 Slopes 1 6 Moderate Flow Channels 18 months 2.1 • 1.1 Slopes 8 1 N Medium Flow Channels 24 months 11 & Greater Slopes 10 High Flow Channels Figure ECB- 1 Additional Drawings: „ - Staple detail i Detail I / • ' yf , - - r 1 ' r Detail 3 -► * — / i f / ♦ 1 --- R'o'!i ' � _ _ _ Detail 'I Column Erosion Control Blanket Persective View 4 in (102 mm) —. / -3 in (76 mm) minimum _ 4 �\ F -i2 in (152-305 mm) - . \ minimum --... I x .1 -„,„,....D_ ' I;- SLIPIC ` , _ j. \ '— Staple ____ Tamp soil �Irnnla - -`1� Terminal Fold - Terminal Fold - jute mesh only excelsior blanket DETA IL n. L i er osion n control paper 12 in (305 mm) — ��-- 'i2 in (305 mm) i `tee � in (952 ninl . 7 r .••� „�\, 1. J. _.atimikl(7-wri fn -11 Staples tee' Staples ' • `__Y Junction Slot - Junctinn Slot - jute mesh erosion nF TA.il 2 excelsior blanket control paper Erosion Control Blanket; Detail i and Detail 2 Section View K Additional Drawings: rr 12 in (305 mm) // r Tamp soil firmly Tamp soil firm{ \ - 6 - 12 in (152-305 mm)N f ., r'• minimum depth ; j I I - `-�' Stap;es -N,....,/ ` ` Staple Anchor Slot- Check Slot - jute mesh erosion control paper excelsior blanket erosion control paper 11FTAII 3 DETAIL 4 4in ('102mm) _ minimum r 1 in (25 mnl) i! minimum /r .1I. ) 5 -12 in (152-305 mn;; ..f.• et minimum —Staple �i .. r i Lap Joint- jute mesh STAPLE DETAIL excelsior blanket erosion control paper shall be butted togther ! l DETAIL 5 Erosion Control Blanket: Detail 3,: Detail 4, Detail 5, and Staple Detail! Section View C Filter Berm (FB) rti • - M Q• Description A filter berm is a temporary ridge made up of natural materials that already occur on the project site such. Brush filter berms use small tree ranches, root mats, grass, leaves, stone, or other debris or material naturally available or left over from site clearing and grubbing (slash). Rock filter berms use site gravel, stone, or rock. Both types of filter berms are placed along a level contour to slow, filter, and divert flow and act as an efficient form of sediment control. In some configurations, filter berms are covered with a filter cloth to stabilize the structure and improve barrier efficiency. Applicability The drainage area for filter berms must be no greater than 2 acres. In addition, the drainage slope leading down to a filter berm must be no greater than 2: 1 and no longer than 100 feet. The following are suitable applications. • 5 to 7 feet beyond the tow of slopes. • Along the site perimeter; • Along streams and channels or adjacent to roadways. • Around temporary spoil areas or other small cleared areas. Limitations • Intended to be used only in gently sloping areas, and are not appropriate for high-velocity flow areas. • Brush filter berms have limited usefulness because they are constructed of materials that decompose. • A large amount of material is needed to construct a useful filter berm. Therefore, filter berms are only applicable to sites where there is enough brush material from clearing and grubbing or rock material to form a sufficiently sized berm. • May be difficult to remove after construction. Design Criteria No formal design in required. Construction Specifications Brush (Slash) Filter Berms 41 • Place material cleared form the site across the slope or swale. Material with a diameter larger than six inches should not be used. • Cut up brush if necessary and compact to avoid large voids within the barrier. • The barrier mound should be at least three feet high and five feet wide at its base. • It is recommended, but not required, that the mound be covered with a filter fabric barrier to hold the material in place and increase sediment barrier efficiency. If using a filter fabric cover, bury the edge in a trench four inches deep and six inches wide on the drainage side of the barrier. This is done to secure the fabric and create a barrier to sediment while allowing storm water to pass through the water-permeable filter fabric. The fabric should be extended just over the peak of the brush mound and secured on the down-slope edge of the fabric by fastening it to twine or small-diameter rope that is staked securely. Rock Filter Berms • Place filter berm along a level contour. Use well-graded, angular site gravel or crushed rock of medium to large diameter with larger rocks on the bottom. • If desired, cover with geotextile fabric or wire screen (especially if concentrated flows are expected) to help keep berm in tack. Anchor fabric or wire by placing under the berm or use stakes. • Trenching is not required. • Berms should be spaced according to the steepness of the slope, with berms spaced closer together as the slope increases. Maintenance Considerations The frequency of inspections should be in accordance with the Storm Water Management Plan (SWMP). If channels form through void spaces in the barrier, the barrier should be reconstructed to eliminate the channels. Ensure that sediment has not built up and that no damage has been done by vehicles. Regular inspection should indicate the frequency of sediment removal needed. Accumulated sediment should be removed from the uphill side of the barrier when sediment height reaches between 1/3 and 1/2 the height of the barrier. Sediment should be disposed of and the filter material and/or fabric should be replaced if necessary. It is important that repairs be performed at the first sign of deterioration to ensure that the berm is functioning properly. Removal Remove filter berms after uphill drainage areas are stabilized. Rock and brush may be left in place only if it does not cause any landscaping problems. Remove all manmade materials (wire, fabric and/or stakes). References Environmental Protection Agency (EPA), National Pollutant Discharge Elimination System (NPDES). Construction Site Storm Water Runoff Control. Washington, D.C., February 2003 http://cfpub.epa.gov/ndpes/stormwater/menufbmps/con_site.cfm Horizon Environmental Services, Inc, Guidance Document Reasonable and Prudent Practices for Stabilization (RAPIDS) of Oil and Gas Construction Sites. April 2004 42 Hydro-mulch (HM) ,i 41 I. .e • te Hydro-mulch is a soil binder that provides temporary soil stabilization. The stabilizer is sprayed onto the surface of exposed soil to hold the soil in place and minimize erosion from runoff and wind. These materials are easily applied to the surface of the soil, can stabilize areas where vegetation cannot be established, and provide immediate protection. Soil binders are typically applied to disturbed areas requiring short-term temporary protection. Because soil binders can often be incorporated into the work, they may be a good choice for areas where grading activities will soon resume. Applications can be applied to stockpiles to prevent water and wind erosion. Applicability Use hydro-mulch alone in areas where other methods of stabilization are not effective because of ig environmental constraints, or use them in combination with vegetative or perimeter practices to enhance erosion and sediment control. Limitations • Soil binders are temporary in nature and may need reapplication. • Soil binders require a minimum curing time until fully effective, as prescribed by the manufacturer, which may be 24 hours or longer. Soil binders may need reapplication after a storm event. • Soil binders will generally experience spot failures during heavy rainfall events. If runoff penetrates the soil at the top of a slope treated with a soil binder, it is likely that the runoff will undercut the stabilized soil layer and discharge at a point further down slope. • Soil binders do not hold up to pedestrian or vehicular traffic across treated areas. • Soil binders may not penetrate soil surfaces made up primarily of silt and clay, particularly when compacted. • Some soil binders may not perform well with low relative humidity. Under rainy conditions, some agents may become slippery or leach out of the soil. • May not cure if low temperatures occur within 24 hours of application. Design Criteria Closely follow the manufacturer's recommended application procedures to prevent the products from pooling and creating impervious areas where stormwater cannot infiltrate. 43 Maintenance Considerations Inspect chemically stabilized areas regularly for signs of erosion, and if necessary, reapply the stabilizer. References California Department of Transportation (CDOT), Construction Site Best Management Practices Manual. CA., March 1 , 2003 . http://www.dot.ca.gov/hq/construc/stormwater United States Environmental Protection Agency (EPA), National Pollutant Discharge Elimination System (NPDES). Construction Site Stormwater Runoff Control. Washington, D.C., February 2003 . http://cfpub.epa.gov/npdes/stormwater/menuofbmps/index.cfm 44 Land Grading (LG) itifrer;o. r Description Grading involves reshaping the ground surface to planned grades. Grading provides more suitable topography for well pads and pipelines and helps to control runoff, soil erosion, and sediment during and after construction in these areas. Land grading includes the following. • Proper cut and fill techniques to ensure roads and well pads remain stable over time. • Road crowning or sloping to properly route stormwater off of the roadway. • Surfacing of roads or well pads with gravel to avoid mud, rutting, and large quantities of sediment that will wash away during storms. Applicability • The construction and maintenance of any road or well pad, but particularly those located on steep topography or easily erodible soils. • Surface gravel areas with "soft" soils sections, steep grades, highly erosive soils, or where all-weather access is needed. Gravel may be used as "fill" material in ruts or as a full structural section over the entire road or well pad. Limitations • Improper cut and fill slopes that disrupt natural stormwater patterns might lead to poor drainage, high runoff velocities, and increased peak flows during storm events. • Rutting and wash boarding may develop if surface gravel is not designed properly or if road or well pad is not sloped properly. • Flat-blading to maintain the roadway must be done properly to avoid changes in gravel thickness, road slope, and road grade. Design Criteria Land grading should be based upon well pad and pipeline layouts that fit and utilize existing topography and desirable natural surroundings to avoid extreme grade modifications. Clearing and grading should only occur at those areas necessary for well pad activity and equipment traffic. Maintaining undisturbed temporary or permanent buffer zones in the grading operation provides a low cost sediment control measure that will help reduce runoff and off-site sedimentation. 45 Slope failures Landslides and failed cuts and fills can be a major source of sediment. Slope failures can close the roads or require major repairs and can greatly increase maintenance costs. Slope failures or landslides typically occur where a slope is over-steep, where fill material is not compacted, or where cuts in natural soils encounter groundwater or zones of weak material. Good road location can often avoid landslide areas and reduce slope failures. When failure does occur, the slide area should be stabilized by removing the slide material, flattening the slope, adding drainage, or using structures as discussed below. Designs are typically site specific and may require input from geotechnical engineers and engineering geologist. Failures that occur typically impact operations and can be costly to repair. Failures near streams and channel crossings have an added risk of impact to water quality. Road slope See Figure LG- 1 for details. All roads should be designed with one of the following three slope types. 1 . Out-sloped roads minimize the concentration of water and minimize road width by avoiding the need for an inside ditch, but may require roadway surface and fill slope stabilization. Out-sloped roads with clay rich, slippery road surface materials often require surface stabilization with gravel or limited use during rainy periods to assure traffic safety. Roads with over 10% to 12% grades and on steep hill slope areas, out- sloped roads are difficult to drain and can feel unsafe. 2. In-sloped roads are the best method to control surface water. However, in-sloped roads also concentrate water and require a system of ditches and turnouts or cross draining culverts. 3. Crowned roads are appropriate for higher standard, two lane roads on gentle grades. They may or may not require roadside ditches, turnouts, and/or cross drains. It is difficult to create and maintain a crown on a narrow road, so generally in-sloped or out-sloped road drainage is more effective. Construction Specifications Cut and fill slopes • All areas to be disturbed (both cut and fill) shall be cleared, grubbed, and stripped of topsoil to remove trees, vegetation, roots, or other objectionable material. • Fill material shall be free of brush, logs, stumps, roots, or other objectionable material that would interfere with, or prevent construction or satisfactory fills. This material can be set aside and later used at the toe of fill slopes as filter berms. • Table LG-1 presents a range of commonly used cut and fill slope ratios appropriate for the soil and rock types described. Vertical cut slopes should not be used unless the cut is in rock or very well-cemented soil. Ideally, both cut and fill slopes should be constructed with a 2: 1 or flatter slope to promote growth of vegetation, but cut slopes in dense, sterile soils or rocky material are often difficult to vegetate. • All fills shall be compacted as required to reduce erosion, slippage, settlement, subsidence, or other related problems. • Topsoil required for the establishment of vegetation shall be stockpiled in the amount necessary to complete finished grading of all exposed areas. Areas that are to be top soiled shall be scarified to a minimum depth of 4 inches prior to placement of topsoil. 46 Road slope See Figure LG- 1 . • Compact soil or road base material to direct runoff. • If crowning a road, runoff is directed to both sides of the road requiring two roadside ditches, unless runoff will drain directly to well-stabilized areas. • If using an in-slope design, runoff will be directed toward the hillside and requires a roadside ditch with periodic turnouts or cross drain culvert installation. • If using an out-slope design, ensure a moderate road slope with dense vegetative cover. Surface gravel • Ideally, aggregate surfacing material is (1) hard, durable, and crushed or screened to a minus 2-inch size; (2) well graded to achieve maximum density; (3) contains 5- 15% clayey binder to prevent raveling; and (4) has a plasticity index of 2 to 10. • Gravel thickness should be at least twice the diameter of the largest stone with a minimum thickness of 4 inches. Gravel thickness can be reduced with the use of geotextile or geo-grid sub-grade reinforcement when gravel is placed over very weak soils. Also, geotextile layers are useful over soft soils to separate the gravel from the soil, keep it uncontaminated, and extend the useful life of the gravel. • Compact the aggregate during construction and maintenance to achieve a dense, smooth surface and thus reduce the amount of water that can soak into the road or well pad. • "Spot" stabilize local wet areas and soft areas with 4 to 6 inches of coarse rocky material, add more as needed. • Blend coarse aggregate and fine clay-rich soil (when available) with 5% to 15% fines for binder to produce a desirable composite roadway material that is coarse yet well graded. Maintenance Considerations The frequency of inspections should be in accordance with the Stormwater Management Plan (SWMP). Inspect cut and fill slopes for rills or other indications of erosion. Maintain all crowns, out slopes, in slopes, and surface gravel. References United States Environmental Protection Agency (EPA), National Pollutant Discharge Elimination System (NPDES). Construction Site Stormwater Runoff Control. Washington, D.C., February 2003 . http://cfpub.epa.gov/npdes/stormwater/menuotbmps/index.cfm Horizon Environmental Services, Inc, Guidance Document Reasonable and Prudent Practices for Stabilization (RAPPS) of Oil and Gas Construction Sites. April 2004. Keller, Gordon and James Sherar, Low- Volume Roads Engineering, Best Management Practices Field Guide. United States Department of Agriculture (USDA), Forest Service, US Agency of International Development (USAID), 2003 . http://www.blm.gov/bmp/field%20guide.htm New York State Department of Environmental Conservation, New York Guidelines for Erosion and Sediment Control. New York. August 2005 . http://www.dec.ny .gov/chemical/29066.html 47 TABLE LG-1 Stable Slope Ratios for Various Conditions Soi',Rock Condition Slope Ratio IHor:VE'rtl Most rick. 1/< 1:2: cemented soils I:=: 1 to 1:2: `. Most in-a tace soils 3,t. I to : 'I Ver:: f•aclu^ecl vck 1 : 1 io ' 1.^_: LeoEa coarse g?anularsais 1 1:2: • Heavy Gla,' soils :: F,n '3 Ec'n clay riot Zvn':v u wet seeriage Breas tc' 3 FOIE el s.2i13 1 1/2: •I tt 2: Fill ci harzi, anclular -cce. '•3• Lc'i: c•Us and fills I..; s l igh: 2 I or fia11er ;rrr eyeaetaii0n:t FIGURE LG-1 Typical Road Surface Drainage Options CROVI J SEC11tt4 3-OS .ql:4i.\mod'•:K-�':,;.•.-:.�.\.<.P.: .Q•>.-4+.::..r,:a.a.•i. L•4?:�:::••'�nR+,:�':': � . :<.�,��{.a\{.,h r�); \{\. • W 1. U E SECTION :,r,•:: �'r. 1 • Y ' •I•V1 .••y• FILTER 6ERH 9R :: n :r• a,�,,: i5THF]! SEGtrEliT v\-.-`.Y .•}4\:{'VLY,Vr{.\�vhi.p .:C. ::Q24 a', •i .,.::h 'A:: if.+•ri: r 'l r ,: �q{':ICJ` :i F• ' r `Je/;'� •Y !Y lld� : dfi 1.71ry CCxMTr \' A • :tiYaY�^,?r./za. ,..4 °� Y':.:... . :z l:• c uv:)::;�::'Y�y.:6 v-O'f//.y{ifir'!�{.• „ , ..,. ., ..• ,.. . r rMWPE urtrr rtH sEC1KT4 raaunDE orra•r A 1 . �<pa 4.<•':,":; .- ':`'•i'�'.� .;r'>,"_'''':':':i:''':3rd`:?r°.},"i1<, !:.:.:siaa�tc<Yaa ` ry,`Y'�,� ,'/,, ;��a•::: . .. ,r�r,/,J n:n' ••I�<;`C•�?a.:'..':i r/:F./N.l.• v "i" :.ry rf' r4.#YrJ�ra:`.`?'�JI'r'r�,., SCALE r4CYT TO 4^.L r 48 Liner (L) amaim.the - : _ tsta J. ,,a p. `r, Wir • t y s • a � V r v .p. rise f 3/4 or w�. y ..za r. 1,s 1:44 el 0' ,D �k ILIA o l‘Sa "it %. 'lit Description and Purpose Liners are used for hazardous as well as non-hazardous containment purposes. Suitable Applications t Liner control BMPs are suitable are suitable whenever impermeable containment is required or preferred, typically during the following construction activities: • Secondary containment; • Water and wastewater; • Soil remediation; and • Drilling activities. Limitations • Effectiveness of different liner materials and designs; and • Possibility of tearing when using equipment on or around liner. Design Criteria All liners shall be designed to be an impervious material. Material shall be selected based on required tensile strength to withstand anticipated loading. Construction Specifications The liner should be installed with slack to prevent tearing due to backfill, compaction, and settling. 49 Provide necessary quality assurance and quality control (QA/QC) when installing an impermeable liner, including but not limited to destructive and non-destructive testing of field seams, observation of material for tears or other defects, and air testing for leaks in all field seams and penetrations. Maintenance Considerations The frequency of inspections should be in accordance with the Storm Water Management Plan (SWMP). Liners should be inspected for evidence of rips or tears to ensure continued effectiveness. Torn liners should be considered for replacement. Removal Liners should remain in place while fluids and soils are present. Once the fluid is completely removed, the mud containers can be de-constructed and the removal of any stained soil will be removed with it. 50 Mud Containers (MC) • .,r ' S14 -. °'5'Rert^r!.'e4 ��I.1i �. • 'Q n> �f � ) , -l,;c0 j y f Yl r ! rye ,,. 1 J'�'f t�� r'iM Vah ,�Y,, N ,.f t , 'f 'f * .. , .. l .wr-. v ..w r.. . � �i31.`-tiKr.' -r—.e:•a45T.1�Sl�1C. —... Description and Purpose Mud Containers are earthen berms generally used for temporary storage of drill mud, and/or cuttings during drilling operations. Used as an alternative to tanks. Suitable Applications Mud container control BMPs are suitable during the following construction activities: • Drilling activities; and • Soil and debris surplus storage piles. Limitations • Volume of drilling wastes; • Pollution of land and/or surface water due to failure of mud containers and/or containment system; and • Potential for subsurface pollution due to infiltration. Design Criteria All mud containers shall be sized to handle the expected storage needs. Construction Specifications • The mud container must be constructed at the beginning of drilling, which requires the use of heavy earthmoving equipment. • To remain effective, mud container sides should be compacted with equipment, if possible. 51 • All mud containers shall have negative drainage from the location assisting in containment of the substance the containment is designed for. Field location should be adjusted as needed. Maintenance Considerations The frequency of inspections should be in accordance with the Storm Water Management Plan (SWMP). Mud containers should be inspected for evidence of erosion or deterioration to ensure continued effectiveness. Mud container walls should also be maintained at the original height. Any decrease in height due to settling or erosion, which impacts the effectiveness of the BMP, should be repaired immediately. Material in mud containers should be pumped to another container when two-thirds capacity is achieved. Removal Mud containers should remain in place and in good condition until all fluids are removed. Once the fluid is completely removed, the mud containers can be de-constructed and the removal of any stained soil will be removed with it. 52 Mulching (M) ar • «y. tratirci • - ._ . _ Description Mulching is a temporary erosion control practice in which materials such as grass, hay, wood chips, wood fibers, straw, or gravel are placed on exposed or recently planted soil surfaces. Mulching stabilizes soils by minimizing rainfall impact and reduces stormwater runoff velocity. When used in combination with seeding or planting, mulching can aid plant growth by holding seeds, fertilizers, and topsoil in place, preventing birds from eating seeds, retaining moisture, and insulating plant roots against extreme temperatures. Mulch matting is materials such as jute or other wood fibers that are formed into sheets and are more stable than loose mulch. Jute and other wood fibers, plastic, paper, or cotton can be used individually or combined into mats to hold mulch to theground. Netting can be used to stabilize soils while plants are growing, although netting does not retain moisture or insulate against extreme temperatures. Mulch binders consist of asphalt or synthetic materials that are sometimes used instead of netting to bind loose mulch. Applicability Mulching is often used after (or in combination with) seeding to help aid in the establishment of vegetation. Hydraulic application of mulch is often used in steep areas (up to 1 : 1 ) where regular mulching is difficult because of environmental constraints. Mulch matting, with net or anchoring to hold it in place, can also be used on steep slopes or in critical areas such as waterways. Mulch can last for one to two years and is most effective when used on an area less than two acres in size. Limitations • Mulching, matting, and netting might delay seed germination because the cover changes soil surface temperatures. • The mulches are subject to erosion and may be washed away in a large storm. • Maintenance is necessary to ensure that mulches provide effective erosion control. 53 Design Criteria No formal design is required. Construction Specifications Site preparation • Prior to mulching, install the necessary temporary or permanent erosion control practices and drainage system within or adjacent to the area to be mulched. • Slope, grade, and smooth the side to fit the needs of the selected mulch products. • Remove all undesirable stones and other debris to meet the needs of the anticipated land use and maintenance required. Mulching and anchoring • Select the appropriate mulch and application rate that will best meet the need and availability of material. When possible, organic mulches should be used for erosion control and plant establishment. See Table M- 1 for suggested materials and application rates. Other materials include hydraulic mulch products with 100% post-consumer paper content and yard trimming composts. All materials should be free of seed. • Apply mulch after soil amendments and planting is accomplished or simultaneously if hydro-seeding is used. See Table M-1 for installation guidelines. • Use a mulch crimper to apply and anchor mulch. A crimper should have approximately 6-inch cleats with perpendicular, dull, disc blades. If a crimper is unavailable the Contractor shall apply the mulch and anchor it to the soil using one of the methods described in Table M-2. The mulch should be anchored the same day as the mulch application. Materials that are heavy enough to stay in place (for example, bark or wood chips on flat slopes) do not need anchoring. Mulches may or may not require a binder, netting, or tacking. Mulch binders should be applied at rates recommended by the manufacturer. Effective use of netting and matting material requires firm, continuous contact between the materials and the soil. Hydraulic mulching • For steep slopes or other areas where hydraulic application of mulch is desired, a high- quality type of hydraulic matrix known as a Bonded Fiber Matrix (BFM) may be used. A BFM refers to a continuous layer of elongated wood fiber strands that are held together by a water-resistant bonding agent to form a water-absorbing crust. • A typical construction specification for wood fiber mulch (hydro-mulch) is as follows: Biodegradable green—dyed wood-cellulose-fiber mulch, which is non toxic, free of plant growth- or germination-inhibitors, with maximum moisture content of 15% and a pH range of 4.5 to 6.5. • A typical construction specification for weed-free-straw non-asphaltic tackifier is as follows: Organic derivative vegetative gum tackifier recommended by fiber-mulch manufacturer for a slurry application, which is nontoxic and free of plant growth-or germination-inhibitor. 54 • Hydraulic application of BFM must be done when no rainfall in expected, preferably within a 24-hour time period. Mix BFM in a hydraulic application machine (such as a hydro-seeder or a mulch blower) and then apply to the slope as a liquid slurry. The slurry must be constantly agitated to keep the proper application rate and achieve uniform effective coverage. The minimum application rate shall be 2,000 pounds per acre with a typical application rate between 3,000 and 4,000 pounds per acre. Maintenance Considerations The frequency of inspections should be in accordance with the Stormwater Management Plan (SWMP). Areas should be identified where mulch has loosened or been removed. Such areas should be re-seeded (if necessary) and the mulch cover replaced. If washout, breakage, or erosion occurs, surfaces should be repaired, re-seeded, and re-mulched, and new netting should be installed. Inspections should be continued until vegetation is firmly established. Removal Anchor netting and any other artificial mulch material should be removed when protection is no longer needed and then disposed of in a landfill. References United States Environmental Protection Agency (EPA), National Pollutant Discharge Elimination System (NPDES). Construction Site Stormwater Runoff Control. Washington, D.C., February 2003 . http://cfpub.epa.gov/npdes/stormwater/menuofbmps/index.cfm Horizon Environmental Services, Inc, Guidance Document Reasonable and Prudent Practices for Stabilization (RAPPS) of Oil and Gas Construction Sites. April 2004 New York State Department of Environmental Conservation, New York Guidelines for Erosion and Sediment Control. New York. August 2005 . http://www.dec.nv.gov/chemical/29066.html United States Department of Agriculture (USDA), Natural Resources Conservation Service (NRCS), Field Office Technical Guide. 2002. http://www .nres.usda.aov/technical/efotg/ 55 Table fll-i Typical Mulching Materiels and Application Rates Material R�e Per I Requirements I Notes Organic Mulches unchapped' Spread by hand or madsre; Straw 1 tons unweathered; must be tacked or tied down certified weed tree Wood fiber or wood Use with hydroseeder, maybe 1/2- i ton used to tack straw. Co not use AIM in hot diywealher. Air dry. Add Apply with blower. chip hander, Wood Chips ,- 6 tons fertilker N. 12 or by hand. Not for fine turf Ityton areas_ Air dry, shredded. Apply with mulch blower, chap Bark 35 yre or hamrnermbed, or handler, or by hand. C? not chips. use asphalt rack. Nets and Mats Heavy, uniform; Jute net e'er area oven d single jute ittwtands water flow am. Used wih °manic mulch Excelsior (wood Cover area fiber) mat Tebb M-2 Mulch Anchoring Guide Anchoring Kind of Method or Mulch to be How to Apply Material Anchored Staple the tight-weight paper, jute,wood fiber. or plastic netlings to soil surface according to 1. Mulch netting Hay or straw manurac tuner's. recommendatioare. Shoed be biodegradable. Most products are not suitable for toot traffic. Apply hydroseeder immediate4 after mulching. Use 2_Wood • ellulose 600 te. Wood fiber per acre. Some products fiber nay or straw contain an adteeeive material, possibly advantageous. Apply mulch and pull a mulch anchoring tool (blunt, _ Mulch anchoring Hay oY straw straight discs) over mulch as near to the contour as iooltSnper possible. Mulch material should be 'tucked` into sod surface about 3'. Apply Terra Tack AR 1201tr.Iac. In 480 gat at water 156/sec.) or Aetosprey 70 (60gallac.}according to 4. Chemical Hay or.straw manufacturer's instructions. Avoid application during rain. A 24-hour curing period and a soil temps-afire higher than 46 deg_ Ferhenheit are mired Ripping (RP) e, 1 Description Ripping is a series of infiltration trenches, with no outlet, that receives stormwater runoff Runoff is stored in the void space within these trenches and infiltrates through the bottom and into the soil matrix. The primary pollutant removal mechanism of this practice is filtering through the soil. Ripping increases soil drainage by opening up the soil which allows stormwater to infiltrate at a faster rate and reducing erosion by promoting infiltration. Applicability Ripping can be applied in most regions of the country and is most effective in areas that do not have steep slopes or in soils with a high concentration of clay that may prevent infiltration of stormwater. Ripping is best used in areas where sheet flow of stormwater occurs. Limitations Depending on the surface and/or soil makeup, some areas might not be suitable for all ripping techniques, for example rock formations. Design Criteria Ripping should be completed by going against the natural contours to slow down stormwater velocity. Construction Specifications Ripping should be done with a tool bar attached to a back hoe or land grader equipment. The tool bar should have a minimum of three mounted rippers. Ripped depths should be at least 10 inches in depth and not to exceed 18 inches. The distance between contours is modified as the slope becomes steeper. Maintenance Considerations The frequency of inspections should be in accordance with the Stormwater Management Plan (SWMP). 57 References United States Environmental Protection Agency (EPA), National Pollutant Discharge Elimination System (NPDES). Construction Site Stormwater Runoff Control. Washington, D.C., February 2003 . http://cfpub.epa.gov/npdes/stormwater/menuofbmps/index.cfm U.S Fish and Wildlife Service, Contour Tilling/Ripping, January 2009. http://www.fws.gov/fire/ifcc/esr/Treatments/contour-tillingi.htm 58 p i Nr+.. a7 tg --t r c 0 a, 0 a.> ILI TO ft © cc eL t O 2 W m e a °'' IT c a a oC a , ___, re 1 ' t3 tr 1P Riprap (R) ._ A, 6 ; 41 nl Description Riprap is a permanent, erosion resistant layer made of stones or boulders. It is intended to stabilize areas subject to erosion and protect against scour of the soil caused by concentrated, high velocity flows. Applicability Riprap can be used for areas subject to erosion or weathering, particularly where conditions prohibit the establishment of re-vegetation or where flow velocities exceed 5 feet per second. Riprap can be used in: • Cut and fill slopes; • Chanel side slopes and/or bottoms; • Inlets and outlets to culverts, slope drains, and sediment traps; and • Roadside ditches. Limitations Riprap is limited by steepness of slope, because slopes that are greater than 1 .5 : 1 have potential riprap loss due to erosion and sliding. When working within flowing streams, measures should be taken to prevent excessive turbidity and erosion during construction. Bypassing base flows or temporary blocking base flows are two possible methods. Design Criteria Gradation A well-graded mixture of rock sizes should be used instead of one uniform size (with the exception of dry stacking boulders). Fifty percent by weight should be larger than the specified design size. The diameter of the largest stone size in such a mixture should be 1 .5 times the D50 size with smaller sizes graded down to one inch. When dry stacking up a slope, boulders may be uniform in size or may get gradually smaller as the boulders are placed up the slope. Quality Riprap must be durable so freeze/thaw cycles do not decompose it in a short time. They should be angular and not subject to breaking down when exposed to water or weathering. 60 Size The sizes of stones used for riprap protection are determined by the purpose and specific site conditions: • Slope Stabilization. Riprap stone for slope stabilization not subject to flowing water should be sized for the proposed grade. The gradient of the slope to be stabilized should be less than the natural angle of the repose of the stone selected. Angles of the repose of riprap stones may be estimated using Figure R-1 . Riprap used for surface stabilization of slopes does not add significant resistance to sliding or slope failure and should not be considered a retaining wall. Slopes approaching 1 .5 : 1 may require special stability analysis. The inherent stability of the soil must be satisfactory before riprap is used for surface stabilization. • Outlet Protection. Design criteria for sizing stone and determining dimensions of riprap aprons are presented in CULVERT PROTECTION (CP). • Stream bank Protection. If the shear stress is estimated, riprap stone for stream bank protection can be selected from the gradations in Table R- 1 , below. The shear stress can be estimated from the depth of flow and the channel slope (see note for Table R-1 ). The riprap should extend 2 feet below the channel bottom and be keyed into the bank both at the upstream end and downstream end of the proposed work or reach. Filter material Filter material is sometimes used between riprap and the underlying soil surface to prevent soil from moving through the riprap. Filter cloth material or a layer of sand and/or gravel is usually used for the filter. The design of a sand/gravel filter blanket is based on the ratio of particle size in the overlying filter material to that of the base material in accordance with the criteria below. Multiple layers (each a minimum of 6-inches thick) may be designed to affect a proper filter if necessary. A sand/gravel filter blanket should have the following relationship for a stable design. The design of a synthetic filter fabric, which may be used with or in place of gravel filters, is: • Filter fabric covering a base containing 50 percent or less by weight of fine particles (#200 sieve size); • Total open area of filter fabric should not exceed 36%; • Filter fabric covering other soils; • Equivlent opening size (EOS) is no larger than 0.21 mm (#70 sieve size); • Total open area of filter fabric should not exceed 10%; and • *EOS- Equivalent opening size compared to a U.S. standard sieve size. 61 No filter fabric should have less than 4% open area or an EOS less than U.S. Standard Sieve #100 (0. 15 mm). The permeability of the fabric must be greater than that of the soil. The fabric may be made of woven or non-woven monofilament yarns and should meet the following minimum requirements. • Thickness 20-60 mils • Grab strength 90-120 lbs • Conform to ASTM D-1682 or ASTM D=177 Construction Specifications See Figure R-2 for riprap slope stabilization and stream bank protection. See Figure R-3 for dry stacking boulders. See SEDIMENT TRAP (ST) for a detail of a riprap lined channel leading into a sediment trap. For culvert outlet protection, construct according to CULVERT PROTECTION (CP). Sub-grade Preparation Prepare the sub-grade for riprap to the required lines and grades. Compact any fill required in the sub-grade to a density approximating that of the undisturbed material or overfill depressions with riprap. Remove brush, trees, stumps, and other objectionable material. Cut the sub-grade sufficiently deep so the finished grade of the riprap will be at the elevation of the surrounding area. Channels should be excavated sufficiently to allow placement of the riprap in a manner such that the finished inside dimensions and grade of the riprap meet design specifications. Sand/Gravel filter basket If using a granular filter, spread filter stone in a uniform layer to the specified depth. Where more than one layer of filter material is used, spread the layers with minimal mixing. Synthetic filter fabric If using a filter fabric, place the cloth directly on the prepared foundation. Where large stones are to be placed, a 4-inch layer of fine sand or gravel is recommended to protect the filter cloth. Filter fabric is not recommended as a filter on slopes steeper than 2: 1 . Stone placement Place riprap so it forms a dense, well-graded mass of stone with a minimum of voids. The desired distribution of stones throughout the mass may be obtained by selective loading at the quarry and controlled dumping during the final placement. Place riprap though chutes or other methods that cause segregation of stone sizes. If a filter is used, be careful not to lodge the underlying base filter or damage the filter cloth when placing the stones. If damage occurs, remove the riprap and repair the filter. The toe of the riprap should be keyed into a stable foundation at its base as shown in Figure R-2 if required for slope stabilization and stream bank protection. The finished slope should be free of pockets of small stones or clusters of large stones. Hand placing may be necessary to achieve proper distribution of stone sizes to produce a relatively smooth, uniform surface. The finished grade of the riprap should blend with the surrounding area. 62 Maintenance Considerations The frequency of inspections should be in accordance with the Stormwater Management Plan (SWMP). If riprap has been damaged or dislodged, repairs should be made to prevent a progressive failure. If repairs are needed repeatedly at one location, the site should be evaluated to determine if the original design conditions have changed. Channel obstructions such as trees and sediment bars can change flow patterns and cause erosive forces that may damage riprap. Control of weed and brush growth may be needed in some locations. Removal Riprap is generally not removed. References United States Environmental Protection Agency (EPA), National Pollutant Discharge Elimination System (NPDES). Construction Site Stormwater Runoff Control. Washington, D.C., February 2003 . http://c fpub.epa.gov/npdes/stormwater/menuofbmps/index.cfm New York State Department of Environmental Conservation, New York Guidelines for Erosion and Sediment Control. New York. August 2005 . http://www.dec.ny.gov/chemical/29066.html 63 TARL U t i RIpop Sadlitlea Unit shear stress Minimum blanket (W") Eita c'max thickness (irches) 1167 2 4 6 2 5 9 14 9 14 20 4 12 18 27 5 15 22 71 6 18 773.2 7.8 21: 32 38 8 24 36 43 Unit shear stress calculated as T y'd's where: T=shear stress in IMF knit weight of water. 6L4 Ithtft' (MIaw depth in ft :=channel gradient in Rift FIGURE IFi Antra at Repose al lapin Staines 45,° - 1:1 Crashed Rau* J _ - 4Q° Angle of Angular Rock Slope a-7:k0 Repose 350. - C.1 Rounded Stone 1" 2' , '` 1O' 20f' 4G` imsz 64 - o FIGURE Ra2 Typical POMP 3iap protection wall ryy✓,kAt$acrd,:•�srt tiara dbar•Y.>�d•/•Y.�• o;•a'•';-:• liar •••••44:•%144.--n. % . Pj;• �4.'A"Y S ruin a rr ?•`4Vee 47W rrvo{Jr✓4'�•`�'�:�ti I o rv\ti c../F av?.r•�-:v+;?v. �7•sr;Sk, +� • i.".; .: Mr F�1l� •/v�:`';,4Ogv tiv ` ' r:07::.r r �f�f ••••• SCE:v: . i•• .2.Cr'0�ti'; �. .•;ti. ."141.:4: •a.r+ • p.4 r.h • nouns Tangoed Boulder Ury#tao Detail k �E {fir L Oft FERjIERS ..�SV�rrrJ. ftlJ . Wit ,>Cr; /�� r•>+7y RL 3LQR fl/Sry</ dyb.4.4.A j: �/�•.q�(i. /+mod/ 4/44Y-:v4lfv fhy /�Q.� Sailb NM 13 MLLE 65 Roadside Ditches (RSD) and Turnouts (TO) ; . ii S lv _ I Description Roadside ditches are channels constructed parallel to roads. The ditches convey concentrated runoff of surface water from roads and surrounding areas to a stabilized outlet. Turnouts (also called wing ditches) are extensions of roadside ditches. Turnouts effectively remove run-off water from the roadside ditch into well-stabilized areas before it reaches a waterway. Applicability • Roadside ditches should be used for all roads built on sloping topography and with either an in-slope or a crowned design. • Ditch turnouts should be used as much as possible but their best use may be on slopes longer than 150 feet or greater than 5%, as conditions allow. • Turnouts are applicable where fairly flat naturally vegetative areas exist at intervals by the roadside. Limitations • If these structures are not installed correctly, they may become a source of erosion. • Roadside ditches do not necessarily filter sediment from runoff • Turnouts should be on gradual slopes only. • Turnouts require vegetative cover or other filter at the discharge point. • Turnouts only work well if small volumes of runoff drain into the turnout. • Turnouts should only receive runoff from the road and ditch surface, not from large, uphill watersheds. Design Criteria No formal design required. 66 Construction Specifications Roadside ditches • Roadside ditches should be constructed with no projections of roots, stumps, rocks, or similar debris. • Excavate ditches along roadside to a width and depth that can handle expected flow according to Figure RSD-1 . • All ditches shall have uninterrupted positive grade to an outlet. Slope ditch so water velocities do not cause excessive erosion, but no less than 0.5%. If steep slopes and high velocities exist, use a CHECK DAM (CD) to slow runoff and catch sediment. • To control erosion and collect sediment, construct aggregate check dams according to Figure CD-1 of CHECK DAM (CD). • All ditches shall convey runoff to a sediment trapping device such as a SEDIMENT TRAP (ST) or an undisturbed, well-vegetated, and stabilized area at non-erosive velocity. • If necessary, stabilize ditches with RIPRAP (R) or EROSION CONTROL BLANKET (ECB). Turnouts • Use turnouts wherever possible and on undisturbed soil. • Turnouts should be on gradual slopes only and should slope gradually down from the bottom of the roadside ditch. • Angle turnouts at approximately 30 degrees to the roadside ditch • Discharge the turnout into a well-vegetated area or install a secondary control such as a wattle, sediment trap, or silt fence. As a good rule of thumb, the vegetated outlet area should be a minimum of one-half the size of the total drainage area draining into it. If well-vegetated outlets areas are not available, use culverts or other controls to direct runoff to a stabilized area. • Space turnouts according to the slope as indicated on Figure TO-1 . • Turnouts only work well if small volumes of runoff drain into the turnouts. Turnouts should only receive runoff from the road and ditch surface, not from large, uphill watersheds. Maintenance Considerations The frequency of inspections should be in accordance with the Stormwater Management Plan (SWMP). Road ditches and turnouts should be inspected for any signs of channelization and repaired as necessary. Structures will fail if water exists in channelized flow. Also inspect for sediment buildup at the outlet and at aggregate check dams and remove if necessary. 67 References Horizon Environmental Services, Inc, Guidance Document Reasonable and Prudent Practices for Stabilization (RAPPS) of Oil and Gas Construction Sites. April 2004. Keller, Gordon and James Sherar, Low- Volume Roads Engineering, Best Management Practices Field Guide. United States Department of Agriculture (USDA), Forest Service, US Agency of International Development (USAID), 2003 . http://www.blm.gov/bmp/field%20guide.htm United States Department of the Interior, Bureau of Land Management (BLM), Surface Operating Standards for Oil and Gas Exploration and Development "Gold Book". Fourth Edition, 2007. http://www.blm.gov/wo/st/en/prog/energy/oil and aas/best management practices/gold_book.h tml • 68 FIGURE RSD-1 Roadside Ditch Insallation ra 414 i w Q4 _ • 'A.:AP+ . ++-.0.y.y v�vrgr vq v.p�vy �3QQ OdN�� ' �z,. fir P} � _.•••••eve/ o ry��J b Do • ti do Tr �i Rfli4't' �?%£•;W::: .y'�.'+0l. • �v.�.�.r, .'Sp 4�Dv4�C�ti�•?�A� •Watlddri•Vol41.4'e r;>44•V oto4 'Q'•" - -PAOLI= .'•!lH hf,CRECICTE • iea9aa}?,''•4>?r. NIX) 1.\c"gs>4e :'�;E.?W • CNE�k: 0.44Q5 �}II5 R7Pf�,Y� '�a�;amt�vaa�aa,�a a era a'ca zwwa,",�,savq. • . OR 92CitS401 RK.ET1H0 F TIECEEENET NOTE; SLOPE DITCH (.5!J T4 2 TO STrhai Ll ID CUTLET SCALE IN DT TO '3^- 69 flOUR! TO-I Trout Luvout 51111. YOZOOM AA * R)'O Cl MIMED W* VY Hl/mil MOM mama r E1MENA 02IIMOLde) M ,7 Q � itdi4MM4 K a Nab 'egisseNiti 9,5r MO 11/4 )%64k iNg M a 4aww MCA Olt One WILL Star AMA OR ace mm OCMINQL d SDI COMM Ma) Road Slopes Turrciat Spacing <2% <e09D. 2-5% 2COft -110% 100ft 75ft &hut SWEAT 70 Sediment Trap (ST) . . r. .. . r• ktir;;; ICarigt:.: 1W raCcAl'int; Description Sediment traps are small collection areas that allow sediment to settle out of stormwater runoff. They are usually installed in a drainage way or other point of discharge from a disturbed area. Sediment traps are formed by excavating below grade and/or by constructing an earthen embankment. Applicability Sediment traps are generally temporary control measures used at the outlets of stormwater diversion structures, channels, slope drains, construction site entrance wash racks, or any other runoff conveyance that discharges waters containing erosion sediment and debris. Sediment traps should be used for drainage areas less than five acres. The effective life span of these temporary structures is usually limited to 24 months. Traps may be located in a series to allow for backup control in case one trap fails. Limitations • Regular maintenance is needed to remove sediment. Traps should be located near roads or where accessible to remove sediment. • Although sediment traps allow eroded soils to settle, due to the short detention periods for stormwater, traps typically do not remove fine particles such as silts and clays. • Water may remain in sediment traps for extended periods causing mosquitoes and other insects to gather. Locate the trap in a sunny spot if possible. • Never construct a sediment trap on a live flow stream or in wetlands. Design Criteria Location Traps should be located at points of discharge from disturbed areas. The location will be determined by the natural terrain, drainage pattern of the runoff, and the accessibility for maintenance. Sediment traps should not be located in areas where their failure due to stormwater runoff excess can lead to further erosive damage of the landscape. Alternative diversion pathways should be designed to accommodate these potential overflows. Sediment trap locations should also allow for easy maintenance access for the periodic removal of accumulated sediment. 71 Storage capacity A sediment trap should be designed to maximize surface area for infiltration and sediment settling. This will increase the effectiveness of the trap and decrease the likelihood of backup during and after periods of high runoff intensity. The approximate storage capacity of each trap should be 3,600 ft3 per acre of contributing drainage area. Half of this volume may be in the form of wet storage (a permanent pool) and the other half may be in the form of dry storage. When possible, the wet storage volume should be contained within the excavated portion of the trap. The following formula may be used, as a reference, to estimate the volume of a sedimentation trap. Volume (ft3) = 0.4 x surface area (ft2) x maximum pool depth (ft) Construction Specifications See Figure ST-1 for installation details. • If possible, sediment traps, along with other perimeter controls, shall be installed before any land disturbance takes place in the drainage area. • Traps should be located above the floodplain, where possible. If there are space constraints, several small sediment traps may be constructed in series. • Area under embankment shall be cleared, grubbed, and stripped of any vegetation and root mat. The pool area shall be cleared. • The fill material for the embankment shall be free of roots and other woody vegetation as well as over-sized stones, rocks, organic material, or other objectionable material. The embankment shall be compacted by traversing with equipment while it is being constructed. Seeding of the embankment should be performed as soon as possible after construction of the sediment trap. Erosion control blanketing may also be used to cover the embankment in combination with seeding or during time periods when seeding is ineffective. • The spillway may consist of a stone section in the embankment formed by a combination coarse aggregate/riprap to provide for filtering/detention capability. Riprap shall be 4- inch to 8-inch rock, while the coarse aggregate shall be 1/2 to % inches. A Geotextile may be placed at the stone-soil interface to act as a separator. • Mother option for the spillway is to use straw bales or wattles at the overflow point in the trap and line the rest of the spillway with an erosion control blanket (see EROSION CONTROL BLANKET [ECB]). Maintenance Considerations The frequency of inspections should be in accordance with the Stormwater Management Plan (SWMP). The primary maintenance consideration for temporary sediment traps is the removal of accumulated sediment from the basin to ensure the continued effectiveness of the sediment trap. Sediments should be removed when the basin reaches approximately 50% sediment capacity. Inspectors should also ensure that the trap is draining properly and check the structure for damage from erosion. The depth of the spillway should be checked and maintained at a minimum of 1 .5 feet below the low point of the trap embankment. 72 Removal The structure shall be removed and the area stabilized when the drainage area has been properly stabilized. References Colorado Department of Transportation (CDOT), Erosion Control and Stormwater Quality Guide. 2002. http://www.coloradodot.info/programs/environrnental/water- quality/documents/erosion-storm-quality United States Environmental Protection Agency (EPA), National Pollutant Discharge Elimination System (NPDES). Construction Site Stormwater Runoff Control. Washington, D.C., February 2003 . http://cfpub.epa.gov/npdes/sormwater/menuofbmps/index.cfm Horizon Environmental Services, Inc, Guidance Document Reasonable and Prudent Practices for Stabilization (RAPPS) of Oil and Gas Construction Sites. April 2004 73 FIGURE ST-1 Sediment Trap Installation r-RFP.9' ?ft c151 OR Fl LL—N-, EJ?>JSFCt4 urmcL Etl�+tJr.PENT ElLPik%ET (ECB h : r .--_,„,,,,,,:\ i ■ f� 4TORA 'FLAN ',15LU IllE f' er P3FETAL T SPILUNA) OF R1 MVP,—'r c -----r ,, . La II STRAY" B4 L... ‘, W,'SFRE5 N4WOE? Si LT FENCE ( E BENS) ____ 1, �. - j ~A .%,/ B ) B - k - j STARE chISTAL EO T4 AT—I ti----r' '--_._-/ LE G r 164 H LcC S3 R311 1 i5 i -W rJ7E9LI E V LSfWE T47 S . �d% cUHT,LM ❑E61GPJ FLDll5 Si LT FENCE F4iTPJL4Tl�f1-. F -1 r�� 1 ro `� e—vTllittw ST,5ta 013TPLLED T4 e,T-� I r`^ '+ - ' y,• LEPST 1Er ____ ilR,'DQ 4`+ •-•'•'•'•'•'•'rll: '-:-' y E. - J I 121- R1Ff #' �. . . . . . .. .rlt. .,. t (IF L ) CR rift_EE .f•. lr. . .. ' '.' ' 'X' III l Pi Rge= DR ET37 'IL'.•410i1—'� .•::. — 7..2'WrlTP,CI. VL' ET IIj r'` .'- 7- `•. r k� I .'j B . • .rfr .. . ill e. d-r-st i D-t`4...` . . Kin R1 P RtA ti ]ti y H •5 _— �� . --CLEF CF. Flt AIL^HOP. TREE '4- nic r': .. HHH f1�'✓y�ii: �.•.S, EN S'tl!IN EMT RP RA CR Cr?.ma ••s' f r : '` ,._�2 ��r •�r~r�,, 1:11110111511. py.{ iU'S LENGTH 0 ER EMT 're "��:^ . we:. Ft]WED OEF fH-- 1 .J1' 1< CRAJ M ALE % ((AO) 'ti • / r' +*r r. r^ ^^ btAl i h 11 LE � f V,. s�lr.;� • t ':4,'L Ff'•- f:'UA9E ACM --e F,PISI F- r4DT TO SY'1.1 F 74 Seeding (S) _ �"~ c Description Temporary seeding can be used to stabilize disturbed areas that will be inactive for an extended period. Permanent seeding should be used to stabilize areas at final grade that will not be otherwise stabilized. Effective seeding includes preparation of a seedbed, selection of an appropriate seed mixture, proper planting techniques, and protection of the seeded area with mulch, geotextiles, or other appropriate measures. Seeding establishes vegetation that reduces erosion and sediment displacement by stabilizing disturbed areas in a manner that is economical, adaptable to site conditions, and allows selection of the most appropriate plant material. Seeding also: • Absorbs the impact of raindrops; • Reduces the velocity of runoff; • Reduces runoff volumes by increasing water percolation into the soil; • Binds soil with roots; • Protects soil from wind; • Improves wildlife habitat; and • Enhances natural beauty. Applicability Seeding is most effective on slopes no steeper than 2: 1 . Seeding may be used as a permanent control or a temporary control in areas where exposed soil surfaces are not to be re-graded for periods longer than 30 days. Such areas include denuded areas, soil stockpiles, berms, temporary road banks, etc. Prior to seeding, ensure that areas to be revegetated have soil conditions capable of supporting vegetation. Overlot grading can result in loss of topsoil, resulting in poor quality sub-soils at the ground surface that have low nutrient value, little organic matter content, few soil microorganisms, rooting restrictions, and conditions less conducive to infiltration of precipitation. As a result, it is typically necessary to provide stockpiled topsoil, compost, or other soil amendments and rototill them into the soil to a depth of 6 inches or more. 75 Topsoil should be salvaged during grading operations for use and spread on areas to be revegetated later. Topsoil should be viewed as an important resource to be utilized for vegetation establishment, due to its water-holding capacity, structure, texture, organic matter content, biological activity, and nutrient content. The rooting depth of most native grasses in the semi- arid Denver metropolitan area is 6 to 18 inches. At a minimum, the upper 6 inches of topsoil should be stripped, stockpiled, and ultimately reapplied across areas that will be revegetated. Where topsoil is not available, sub-soils should be amended to provide an appropriate plant- growth medium. Organic matter, such as well digested compost, can be added to improve soil characteristics conducive to plant growth. Other treatments can be used to adjust soil pH conditions when needed. Soil testing, which is typically inexpensive, should be completed to determine and optimize the types and amounts of amendments that are required. If the disturbed ground surface is compacted, ripped, or rototilled, the surface prior to placing topsoil. If adding compost to the existing soil surface, rototilling is necessary. Surface roughening will assist in placement of a stable topsoil layer on steeper slopes, and allow infiltration and root penetration to greater depth. Prior to seeding, the soil surface should be rough and the seedbed should be firm, but neither too loose nor compacted. The upper layer of soil should be in a condition suitable for seeding at the proper depth and conducive to plant growth. Seed-to-soil contact is the key to good germination. Limitations The effectiveness of seeding can be limited by: • High erosion potential during establishment; • The need for stable soil temperature and soil moisture content during germination and early growth; • The need to re-seed areas that fail to establish; and • Limited seeding times depending on the season. Proper seedbed preparation and the use of quality seed are important in this practice. Failure to carefully follow sound agronomic recommendations will often result in an inadequate stand of vegetation that provides little or no erosion control. Seeding does not immediately stabilize soils. Prior to seeding, install necessary erosion and sediment control practices such as diversions, straw bales, and basins until vegetation is established. Design Criteria Successful plant establishment can be maximized with proper planning; consideration of soil characteristics; selection of plant materials that are suitable for the site; adequate seedbed preparation, liming, and fertilization; timely planting; and regular maintenance. When to seed Areas to be stabilized with vegetation must be seeded or planted one to four months after grading is completed unless temporary stabilization measures are in place. Temporary stabilization measures should be installed through "no growth" periods during winter months until the weather can support seed growth. 76 Seed mix Climate, soils, and topography are major factors that dictate the suitability of plants for a particular site. Vegetation that has adapted to the site, has strong roots, and provides good ground cover should be used. Although a native seed mix is best, some grasses such as Vetiver have been used extensively worldwide because of their strong deep roots, adaptability, and non- invasive properties. Construction Specifications • Seeding does not immediately stabilize soils. Temporary erosion and sediment control measures should be in place to prevent off-site transport of sediments from disturbed areas until vegetation is established. • Vegetation should not be established on slopes that are unsuitable due to inappropriate soil texture, poor internal structure or internal drainage, volume of overland flow, or excessive steepness, until measures have been taken to correct these problems. • If the area has been recently loosened or disturbed, no further roughening is required. When the area is compacted, crusted, or hardened, the soil surface shall be loosened by disking, raking, harrowing, or other acceptable means to ensure good water infiltration and root penetration (see SOIL ROUGHENING [SR]). • The soil on a disturbed site may need to be modified to provide an optimum environment for seed germination and seedling growth. To maintain a good stand of vegetation, the soil must meet certain minimum requirements as a growth medium. If any of the below criteria cannot be met then topsoil shall be applied. The existing soil must have these characteristics: 1 . Enough fine-grained material to maintain adequate moisture and nutrient supply. 2. Sufficient depth of soil to provide an adequate root zone. The depth to rock or impermeable layers such as hardpans shall be 12 inches or more, except on slopes steeper than 2: 1 where the addition of soil is not feasible. 3 . A favorable pH range for plant growth. If the soil is so acidic that a pH range of 6.0 to7.0 cannot be attained by addition of pH-modifying materials, then the soil is considered an unsuitable environment for plant roots and further soil modification would be required. 4. Freedom from toxic amounts of materials harmful to plant growth. 5. Freedom from excessive quantities of roots, branches, large stones and clods of earth, or trash of any kind. Clods and stones may be left on slopes steeper than 3 : 1 if they do not significantly impede good seed soil contact. • Add fertilizer and/or lime, if necessary. Lime and fertilizer may be incorporated into the top 2 to 4 inches of the soil if possible. The addition of lime is equally as important as applying fertilizer. Lime will modify the pH and supply calcium and magnesium. Its effect on pH makes other nutrients more available to the plant. • The appropriate seed shall be evenly applied with a broadcast seeder, drill, cultipacker or hydro-seeder. Seeding depth should be 1/4 to %2 inch. • If necessary, apply mulch according to MULCHING (M). The mulch will hold moisture and modify temperature extremes and prevent erosion while seedlings are growing. Maintenance Considerations The frequency of inspections should be in accordance with the Stormwater Management Plan (SWMP). Vegetation is considered established when a density of at least 70% of pre-disturbance 77 levels has been reached. Seeded areas should be inspected for failure and any necessary repairs and re-seeding should be made within the same season if possible. References United States Environmental Protection Agency (EPA), National Pollutant Discharge Elimination System (NPDES). Construction Site Stormwater Runoff Control. Washington, D.C., February 2003 . http://cfpub.epa.gov/npdes/stormwater/menuofbmps/index.cfin Horizon Environmental Services, Inc, Guidance Document Reasonable and Prudent Practices for Stabilization (RAPPS) of Oil and Gas Construction Sites. April 2004. Keller, Gordon and James Sherar, Low- Volume Roads Engineering, Best Management Practices Field Guide. United States Department of Agriculture (USDA), Forest Service, US Agency of International Development (USAID), 2003 . http://www.blm.gov/bmp/field%20guide.htm 78 Table S- 1 . Minimum Drill Seeding Rates for Various Temporary Annual Grasses Species' Growth Seasonb Pounds of Pure Live Planting Depth Seed (PLS)/acre` (inches) (Common name) Oats Cool 35 - 50 1 - 2 Spring Wheat Cool 25 - 35 1 - 2 Spring Barley Cool 25 - 35 1 - 2 Annual Ryegrass Cool 10 - 15 1/2 Millet Warm 3 - 15 1/2 _ 34 Sudangrass Warm 5-10 1/2 _ 34 Sorghum Warm 5-10 1/2 _ 34 Winter Wheat Cool 20-35 1 - 2 Winter Barley Cool 20-35 1 - 2 Winter Rye Cool 20-35 1 - 2 Triticale Cool 25-40 1 - 2 a. Successful seeding of annual grass resulting in adequate plant growth will usually produce enough dead-plant residue to provide protection from wind and water erosion for an additional year. This assumes that the cover is not disturbed or mowed closer than 8 inches. Hydraulic seeding may be substituted for drilling only where slopes are steeper than 3 : 1 or where access limitations exist. When hydraulic seeding is used, hydraulic mulching should be applied as a separate operation, when practical, to prevent the seeds from being encapsulated in the mulch. b. See Table TS/PS-3 for seeding dates. Irrigation, if consistently applied, may extend the use of cool season species during the summer months. c. Seeding rates should be doubled if seed is broadcast, or increased by 50 percent if done using a Brillion Drill or by hydraulic seeding. 79 Silt Fence (SF) rye. �L TY * ` ' fr 't' r' • t_= � � �=aV 4a- :L ••_ _M .:11l t • I I ,' 1 • t . 1. I ice. • •• �S'�4 ti ` ( . .q •:u . ? _ ''Z`Y. Description Silt fences are used as temporary perimeter control around sites where there will be soil disturbance due to construction activities. They consist of a length of filter fabric stretched between anchoring posts at regular intervals along the site perimeter. Applicability Silt fences are generally applicable to construction sites with relatively small drainage areas. They are appropriate in areas where runoff will be occurring as low-level shallow flow, not exceeding 0.5cfs. The drainage area for silt fences generally should not exceed 0.25 acre per 100-foot fence length. Slope length above the fence should not exceed 100 feet. Limitations • Silt fence should not be installed along areas where rocks or other hard surfaces will prevent uniform anchoring of fence posts and entrenching of the filter fabric. This will greatly reduce the effectiveness of silt fencing and can create runoff channels leading off site. • Silt fences are not suitable for areas where large amounts of concentrated runoff are likely to occur. • Open areas where wind velocity is high may present a maintenance challenge, as high winds may accelerate deterioration of the filter fabric. • Silt fences should not be installed across streams, ditches, or waterways. • When the pores of the fence fabric become clogged with sediment, pools of water are likely to form on the uphill side of the fence. Location and design of the silt fence should account for this and care should be taken to avoid unnecessary diversion of stormwater from these pools that might cause further erosion damage. 80 Design Criteria The fence should be designed to withstand the runoff from a 10-year storm event. Construction Specifications • Erect silt fence according to Figure SF- 1 . • If standard strength fabric is used in combination with wire mesh, the support posts should be spaced no more than 10 feet apart. If extra-strength fabric is used without wire mesh reinforcement, the support posts should be spaced no more than 6 feet apart. • Stakes used to anchor the filter fabric should either be wooden or metal. Wooden stakes should be at least 3 feet tall and have a minimum diameter of 2 inches if a hardwood such as oak is used. Softer woods such as pine should be at least 4 inches in diameter. When using metal post in place of wooden stakes, they should have a minimum weight of 1 to 1 .33pounds per linear foot. If metals post are used, attachment points are needed for fastening the filter fabric using wire ties. The height of the fence post should be between 16 to 34 inches above the original ground surface. • Material for silt fences should be a pervious sheet of synthetic fiber such as polypropylene, nylon, polyester, or polyethylene yarn, chosen based on minimum synthetic fabric requirements, as shown in the following table. Physical Property Requirements Filtering Efficiency 75-85% (minimum): Highly Dependent on local conditions Tensile Strength at 20% Standard Strength: 30 lbs/linear inch (minimum) (maximum) Elongation Extra Strength: 50 lbs/linear inch (minimum) Ultraviolet Radiation 90% (minimum) Slurry Flow Rate 0.3 gal/ft2/min (minimum) • Use a continuous roll of fabric to eliminate unwanted gaps in the fence. If a continuous roll of fabric is not available, the fabric should overlap from both directions only at the stakes or posts with a minimum overlap of 6 inches. • Extend silt fence across grade and up slope for a short distance. • Compact backfill at the base of the fabric. • Plow in or entrench the bottom of the fabric fence at least 6 inches below the ground surface. This will help prevent gaps from forming near the ground surface that would render the fencing useless as a sediment barrier. Maintenance Considerations The frequency of inspections should be in accordance with the Stormwater Management Plan (SWMP). Inspect silt fences to ensure that they are intact and that there are no gaps at the fence- ground interface or tears along the length of the fence. If gaps or tears that impact the effectiveness of the silt fence are discovered, they should be repaired or the fabric should be replaced immediately. Accumulated sediments should be removed from the fence base when the sediment reaches 1/3 to 1/2 the height of the fence. Sediment removal should occur more frequently if accumulated sediment is creating noticeable strain on the fabric and there is the possibility of the fence failing due to a sudden storm event. 81 Removal Remove silt fences and all accumulated sediment after uphill drainage areas are stabilized by vegetation or other means. References Colorado Department of Transportation (CDOT), Erosion Control and Stormwater Quality Guide. 2002. http://www.coloradodot.info/programs/environmental/water- quality/documents/erosion-storm-quality United States Environmental Protection Agency (EPA), National Pollutant Discharge Elimination System (NPDES). Construction Site Stormwater Runoff Control. Washington, D.C., February 2003 . http://cfpub.epa.gov/npdes/stormwater/menuofbmps/index.cfm Horizon Environmental Services, Inc, Guidance Document Reasonable and Prudent Practices for Stabilization (RAPPS) of Oil and Gas Construction Sites. April 2004. Keller, Gordon and James Sherar, Low- Volume Roads Engineering, Best Management Practices Field Guide. United States Department of Agriculture (USDA), Forest Service, US Agency of International Development (USAID), 2003 . http://www.blm.gov/bmp/field%20guide.htm 82 FIGURE SF-1 Silt Fence Installation PGST 7, ,,r` r-3iLT FTJXE 543E ' FCC —•. .• ' Nora-IIW Ire i I TTEJ4CS-1 1(40 SILT FENCE FABRIC C'•••' ATTIci-ED TO FAST !,1.c I-i i IN • 4D TEDEH 1 ` • • KIT ACHED TO P+7ST • • •• • F13Y4 Ai • 4.94 a{>M4C:::..?"74.4Pd/<a,:' RJJW 14$@ 4r,sc• O`7vx'0,n.de Y' i•- Err RanH • % C%tc•_0.x';4.+'• -,.., se aaV-0 • Wr.6Y1 F- IN DT TO arm r O3 Straw Bale Barrier (SBB) - . e _rt - d a r. Description A straw bale barrier is a series of entrenched and staked straw bales placed on a level contour to intercept sheet flows. The barrier reduces runoff velocity and filters sediment laden runoff from small drainage areas of disturbed soil. The barrier may also be used to protect against erosion. Straw bale barriers have an estimated design life of three months. Applicability Straw bale barriers may be used below disturbed areas subject to sheet and rill erosion where the length of slope above the straw bale barrier does not exceed the following limits. Constructed Percent Slope Length Slope Slope (ft) 2: 1 50% 25' 3 : 1 33% 50' 4: 1 25% 75' Straw bales may be used in the following applications. • Below the toe of erodible slopes or other small cleared areas. • At the top of slopes to divert runoff away from disturbed slopes. • As sediment traps at outlets to culverts, ditches, turnouts, etc. • Along the perimeter of a site. • Around temporary stockpiles and soil areas. • Along streams and channels for both erosion and sediment control. • As check dams across mildly sloped swales or construction roads (See CHECK DAM [CD]). 84 Limitations • For short-term use only. • For use below small drainage areas less than 2 acres. • Decomposes over time. • May be consumed by livestock. • Straw bales must be certified weed free to avoid invasive weeds that may develop and should not be used in areas where weeds are a concern. • Removal of anchor stakes will be necessary after stabilization is complete. • Not recommended for concentrated flow, live streams, or swales where there in the possibility of a washout. Design Criteria No formal design is required. Construction Specifications See Figure SBB- 1 for installation details. • Bales shall be placed in a single row on a level contour with ends of adjacent bales tightly abutting one another. • Bales shall be certified weed free. • Allow sufficient space up slope from the barrier to allow ponding and to provide room for sediment storage. • All bales shall be either wire bound or string tied. Straw bales shall be installed so bindings are oriented around the sides rather than along the tops and bottoms of the bales in order to prevent deterioration of the bindings. • A trench shall be excavated the width of a bale and the length of the proposed barrier to a minimum depth of 4 inches. Stake the bales with minimum 2 inch x 2 inch x 36 inch wood stakes or standard "T" or "U" steel posts (minimum weight of 1 .33 pounds per linear foot). • After the bales are staked and chinked (gaps filled by wedging), the excavated soil shall be back filled against the barrier. Backfill soil shall conform to the ground level on the downhill side and shall be built up to 4 inches against the uphill side of the barrier. Maintenance Considerations The frequency of inspections should be in accordance with the Stormwater Management Plan (SWMP). Close attention should be paid to the repair of damaged or rotting bales, end runs, and undercutting beneath bales. Necessary repairs to barriers or replacement of bales should be accomplished promptly. Sediment deposits should be removed when the level of deposition reaches approximately one-half the height of the barrier. Removal Straw bale barriers may be removed when they have served their usefulness or may remain in place to decompose over time. Straw bales should not be removed, however, until the up-slope areas have been permanently stabilized. Any sediment deposits remaining in place after the straw bale barrier is no longer required, should be dressed to conform to the existing grade, prepared, and seeded. 85 References Colorado Department of Transportation (CDOT), Erosion Control and Stormwater Quality Guide. 2002. http://www.coloradodot.info/programs/environmental/water- qual ity/documents/eros ion-storm-quality Horizon Environmental Services, Inc, Guidance Document Reasonable and Prudent Practices for Stabilization (RAPPS) of Oil and Gas Construction Sites. April 2004. New York State Department of Environmental Conservation, New York Guidelines for Erosion and Sediment Control. New York. August 2005. http://www.dec.ny.gov/chemical/29066.html 86 FIGURE SBB-1 Straw Bale Installation BY.B 157,1451- B E U 13-11121—i —1 r •( 1 s" 3b' Marti I•13 Will MA IMPS \ . • STRAY 8 TIP Da STRAY aD (E Ct15-N I FD TD AT • la . • , LEAK law 1301* Cf RE? . ' ' • : sf'c nLL H4TEt(al • y�' • • • • tC37NPhtr S�5L : •• •'••, •• T4 PREkEtT PPt1E ) r. V: ;t.s • • • •. .is . ::y.541' ;1i:'4':4 . .>;...%•. .• .•�. . .• .•..:.:'::.:.:,.•. '.• 4.4 4,¢.�yaa� •.•. :. . ' . o darpaa a � :4• • r '41%5I F- r4❑T TO WILE Soil Roughening (SR) - _ - - _ ! _ 1 � - ' art —� • Sim �t `1 ��.�_ tom:, - .r: .t., -1 • � • • .r. � " l { s Description Soil (surface) roughening is an erosion control practice that involves tracking, scarifying, imprinting, or tilling a disturbed area to provide temporary stabilization of disturbed areas. Surface roughening creates variations in the soil surface that help to minimize wind and water erosion. Depending on the technique used, surface roughening may also help establish conditions favorable to establishment of vegetation. Applicability Soil roughening is most effective for areas of one acre or less and works well for the following applications. • Any slope, but particularly fill slopes greater than 3 : 1 . • Areas with highly erodible soils. • Soils that are frequently disturbed. Limitations • Soil roughening is not appropriate for rocky slopes. • Soil compaction might occur when roughening with tracked machinery. • Soil roughening is of limited effectiveness in anything more than a gentle or shallow depth rain. • If roughening is washed away in a heavy storm, the surface will have to be re-roughened. Design Criteria No formal design is required. However, the selection of the appropriate method depends on the type of slope. Steepness, mowing requirements, and/or a cut or fill slope operation are all factors considered in choosing a roughening method. Construction Specifications • To slow erosion, roughening should be done as soon as possible after grading activities have ceased (temporary or permanently) in an area. • All cut and fill slopes should be roughened whenever possible. • Do not blade or scrap the final fill slope face. • Excessive compacting of the soil surface should be avoided during roughening, and areas should be seeded as soon as possible after roughening is completed. 88 Maintenance Considerations The frequency of inspections should be in accordance with the Stormwater Management Plan (SWMP). Roughening might need to be repeated after storm events. References United States Environmental Protection Agency (EPA), National Pollutant Discharge Elimination System (NPDES). Construction Site Stormwater Runoff Control. Washington, D.C., February 2003 . http://cfpub.epa.gov/npdes/stormwater/menuofbmps/index.cfm Horizon Environmental Services, Inc, Guidance Document Reasonable and Prudent Practices for Stabilization (RAPES) of Oil and Gas Construction Sites. April 2004. New York State Department of Environmental Conservation, New York Guidelines for Erosion and Sediment Control. New York. August 2005 . http://www.dec.ny.gov/chemical/29066.htmI 89 Figure SR- 1 _ +- - `. _�_ r- - _--r- �'\'♦ = -.Nsir I►ti; IrA 1I'sr. `t•c=. — f • _ "- Ce' j -r- "CraJ ii. •�. _ ---- ce � ,i---r . ^r -- - _.r _r•- _ r-_ r• - -.- A ,"-- J - -..m. ...- ..• ,tJr i i 1---S_ I - 6.....#7:1).,t...... -- __,—��- Sa 1�.a" ..d r `_ ` re. }'- r Ca•ir-'- a.. a•ii��a� r_- r-- r P.^.Kb. a . r I -.4k.-.....-i III 1 �r -r�_��i I 4FLR:Rr171'S 2•' TO 4" DEEP 2 ti si r- -+ '-tiWITH • -: r.. 4' Dr E-7 ''\ '-"•� •/ PAPA) I Fl TO CCUTftIRS - -r SR- 1 . S'C1 -?FACE ROUGHENING FOR STEEP SLOPES '3.1 Oz STEEPER) _Mi �1L___ !r J'• _-f 1- _ �y _J _ / __ �- ;lid I I I(, _ r — — =T _-J off , 3 •..... t y r r.+� i�'�" / I �r �. �.t r r `!F___ ..reearl- "le ..e-- / ti 1 r=r -� I /tr r „r �• r- '" ..../..y. - tent IGhFK-III -'x:7'15.5 9 SF-i'd . - n ' • a fir L 4' c ri° J ' 4`' DI I - All i t, F45XIY1.111&1 ::PAC: NC PAPAL I I I 3R - ? . SLJ :RFACF R0LJGHFP ING FOP LOW SLOPES [LESS THAN 3:1) Tank Containment (TC) • jfi‘ \ A_, • •.� .n,+..*,�.., .... _ ... � rte, . Description and Purpose Tank containment is used for secondary containment. Suitable Applications The round tank containment control BMPs are suitable for the following potential pollutants: • Secondary containment; • Petrochemicals; • Oil; • Gas; • Hazardous materials; • Liquid fertilizers; • Alcohols; and • Sanitary sewer tanks. Limitations • Containment volume. Design Criteria All mud containers shall be sized to handle the expected storage needs. All round tank containment shall be designed to contain small amounts of non-stormwater discharges, such as rig washing, and use as a secondary containment barrier. 91 Construction Specifications To remain effective, round tank containment should be checked for areas of collapse and available capacity. Maintenance Considerations The frequency of inspections should be in accordance with the Storm Water Management Plan (SWMP). Round tank containment should be inspected for evidence of dents and broken seals to ensure continued effectiveness. Damaged round tank containment should be considered for replacement when found. Removal Round tank containment should remain in place while primary tanks are stored in them. Once the primary tanks are removed, the round tank containment can also be removed from the site. 92 Temporary Slope Drains (TSD) -' l'A rl k 1------ Jet_ A, •Q'7-_ -1c...:444,:, -_ - I• 'r r _ 1 ;� 2. t - - - - - �- .s•." . , :fir yy i d r 7 "♦3 r iR r „ 4r sit , J eM r i - 3 Ipti. A it II is, • it 1, re ' , e • .44A/D .: • ' p. ff •t,• • 1per- Description A temporary slope drain (slope drain) is a pipe, culvert, or chute used to convey concentrated runoff down a disturbed slope that has a high potential for erosion. A drainage channel or berm at the top of the slope drain directs upslope runoff to the pipe inlet or chute for conveyance down the length of a disturbed slope. The pipe outlet or chute must be equipped with outlet protection to prevent erosion at the bottom of the slope. Applicability Use on disturbed slopes to eliminate or minimize gully and rill erosion from concentrated flows. Limitations • The area drained by a slope drain should not exceed 5 acres. • Ideally slope drains should be placed on well compacted stable slopes. • Physical obstructions such as sediment, mulch, or rocks can substantially reduce the drain's effectiveness. • Chute drains should only be used on a straight alignment. • Other concerns are failures from overtopping due to inadequate pipe inlet capacity, berm height above the temporary slope drain, obstructions, and/or the depth of the chute. Design Criteria Effective use of slope drains will reduce erosion until permanent drainage structures are installed. The design should take into consideration an effective collection system to direct runoff to the slope drain, proper sizing and anchoring, and appropriate outlet protection. 93 A temporary drainage ditch or earth berm should be constructed upslope of the slope drain, to collect and convey surface runoff to the slope drain inlet. The slope p drain must be sized to safely convey the desired flow volume as required by the local jurisdiction. Typically a 2-year, 24-hour design storm is used. Temporary slope drains should consist of heavy-duty material designed and suitable for the purpose. This would include flexible or rigid pipe, riprap, or geomembrane lining. Place slope drains on firm, well-compacted soil. For pipe slope drains, compact the soil around and under the inlet section of the pipe to the top of the berm to prevent piping failure or undercutting around the inlet. For chutes, a riprap and/or lined channel section should be provided on compacted soil at the inlet to prevent undercutting. Extend the slope drain beyond the toe of the slope and direct discharge from the slope drain to a stabilized area or sedimentation basin. It is recommended to use riprap at the discharge or outlet area of the drain to reduce erosion. For pipe drains, anchor the drain by burying it with adequate cover or by using an anchor system (at intervals of 10 feet or less) to secure it to the ground. See Figure TSD- 1 for additional design information. Maintenance Considerations Inspection of slope drains should be completed after each significant rainfall to identify eroded areas and to observe the inlet and outlet of the drain for obstructions. Pipe slope drains should be inspected for breaks or obstructions in the pipe. Open chute slope drains should be inspected for undercutting and obstructions near the inlet. Obstructions at the inlet or in the pipe/chute itself, can lead to upslope ponding causing flooding onto inappropriate areas or overtopping of the slope drain. If the slope drain has overtopped make sure that erosion has not compromised the integrity of the drain. Remove any obstructions as soon as possible. Inspect the downstream outlet of the slope drain for signs of erosion and stabilize as needed. Sediment may accumulate at the outfall of the slope drain. Remove the accumulated material to maintain flows and efficiency of the slope drain. Inspect the pipe anchors to ensure that they are secure and add additional anchors where necessary. Removal Slope drains should be removed when no longer needed or prior to installation of permanent slope stabilization measures. Upon removal of the slope drain, stabilize the exposed areas beneath and adjacent to the slope drain using seed and mulch or another permanent stabilization method. References United States Environmental Protection Agency (EPA), National Pollutant Discharge Elimination System (NPDES). Construction Site Stormwater Runoff Control. Washington, D.C., February 2003 . http://cfpub.epa.gov/npdes/stormwater/menuofbmps/index.cfm Urban Drainage and Flood Control District (UDFCD), Urban Storm Drainage Criteria Manual (USDCM) Volume 3. Water Resources Publications, Denver, Colorado, November 2010. http://www.udfcd.org/downloads/pdf/critmanual/Volume%203%20PDFs/chapter%207%20fact %20sheets/EC-07%20Temporary%20Slope%20Drains.pdf 94 Figure TSD- 1 Temporary Slope Drains (TSD) COMPACTED TS L- r EMBANKMENT A BERM DEPTH VARIES PIPE MUST BE ANCHORED W TH SOIL OR OTHER SUITABLE ANCHOR _ � , ` RIPRAP -' • DEPTH VARIES PIPE RIPRAP.- I BEDDING LENGTH VARIES TEMPORARY SLOPE DRAIN PROFILE COMPACTED EMBANKMENT BERM [ DEPTH VARIES UNDISTURBED OR �. COMPAr7EO SOIL. SECTION A DEPTH VARIES PERIMETER ANCHOR TRENCH, SEE ECG GEOMEMBRANE -\\ !� D50VARIES --r I 1 - f LENGTH +_ VARIES RfP?r,F COMPACTED��7 EMBANKMENT BERM L ___._ - E- UNDISTURBED OR 3 COMPACTED SOIL TERMINATION OF RIPRAP GEOMEMBRANE LINED SLOPE DRAIN LINED SLOPE DRAIN PCRIM:T tR ANCHOR .30 MIL (MN) IMPERMEABLE TRENCH, SEE ECB \ DEPTH VARIES -I GEOMEMBRANE LENGTH VARIES TERMINATION OF GEOMEMBRANE LINED SLOPE DRAIN TSD - 1 . TEMPORARY SLOPE DRAIN PROFILE (Detail adapted from the Urban Drainage and Flood Control District) 95 Temporary Stream Crossing (TSC) 1,4 - t f 9449. ��..�Y�'`.'� /C. � �� f 't' "_20_____,,, .a •t ir ii , ic ` ; -•- - le • • ;, 1,. iama: gili lialbM� ti • �s -e:", .�„ •altar ;. _ , �7 -i ret•- -- ,.mot' ,� -. C, . • _ ,944.4 ?IS; .T . it.`' 4 f it- .1 _ .. 4r . -. - _ . Description Where an actively flowing watercourse must be crossed regularly by construction vehicles, a temporary crossing should be provided. Three primary methods are available: • Culvert crossing • Stream ford • Temporary bridge Culvert crossings and fords are the most commonly used methods. Due to the expense associated with a temporary bridge, these are used primarily on long-term projects. Applicability Construction vehicles shall be kept out of waterways to the maximum extent practicable. Use a temporary stream crossing when it is absolutely necessary to cross a stream on a construction site. Construct a temporary crossing even if the stream or drainageway is typically dry. Multiple stream crossings should be avoided to minimize environmental impacts. A permit is required for placement of fill in a waterway under Section 404 of the Clean Water Act. The local office of the U.S. Army Corps of Engineers (USACE) should be contacted concerning the requirements for obtaining a 404 permit. In addition, a peuriit from the U.S. Fish and Wildlife Service (USFWS) may be needed if endangered species are of concern in the work area. Typically, the USFWS issues are addressed by a 404 permit, if one is required. The municipality of jurisdiction should also be consulted, and can provide assistance. Other permits to be obtained may include a floodplain development permit from the local jurisdiction. Limitations Culverts must be appropriately sized for velocity of concentrated water flow and material must be calculated to provide enough weight distribution to carry equipment from one side to another. 96 Design Criteria A culvert crossing should be designed to pass at least the 2-year design flow. Use Figure DC-2 from the Temporary Channel Diversion Fact Sheet to determine the 2-year peak flow rate. Culvert sizing must account for the headwater and tailwater controls to properly size the culvert. For additional discussion on design of box culverts and pipes, see the Major Drainage chapter in Volume 1 . The designer also needs to confirm that the riprap selected is appropriate for the conditions in the channel being crossed. When a ford must be used, namely when a culvert is not practical or the best solution, the ford should be lined with at least a 12-inch thick layer of Type VL (D50 = 6 inches) or Type L (D50 = 9 inches) riprap with void spaces filed with 1 - 1/2 inch diameter rock. Ford crossings are recommended primarily for crossings of ephemeral (i.e. intermittently, briefly flowing) streams. Construction Specifications For a temporary stream crossing, consult with a structural and/or geotechnical engineer for temporary bridge design or consider pre-fabricated alternatives. Maintenance Considerations Inspect stream for bank erosion and in-stream degradation. If bank erosion is occurring, stabilize banks using erosion control practices such as erosion control blankets. If in-stream degradation is occurring, armor the culvert outlet(s) with riprap to dissipate energy (see Outlet Protection Fact Sheet). If sediment is accumulating upstream of the crossing, remove excess sediment as needed to maintain the functionality of the crossing. References Urban Drainage and Flood Control District (UDFCD), Urban Storm Drainage Criteria Manual (USDCM) Volume 3. Water Resources Publications, Denver, Colorado, November 2010. http://www.udfcd.org/downloads/pdf/critmanual/V o lume%203%20PDF s/chapter%207%20fact %20sheets/SM- 10%20Temporary%20Stream%20Crossing.pdf 97 Terracing (T) _ _ - _ r Description Terraces (sometimes called reverse slope benches) are made of either earthen embankments or ridge and channel systems that are properly spaced along a fill slope. Terraces are constructed with an adequate grade to promote drainage to a stabilized outlet. They reduce damage from erosion by collecting and redistributing surface runoff to stable outlets at slower speeds and by decreasing the distance of overland runoff flow. They also surpass smooth slopes in holding moisture and help to minimize sediment loading of surface runoff Applicability Terraces are most effective for areas less than 10 acres in size and, are suitable for the following applications. • Areas with an existing or expected water erosion problem and no vegetation. • Fill slopes greater than 5 feet in height, which are not part of a trench or excavation. • Graded areas with smooth hard surfaces or any cleared area prior to seeding. • Where the length of slopes need to be shortened by terracing. Limitations • Terraces are not appropriate for use on sandy, extremely steep, or shallow soils. • If too much water permeates the soil in a terrace system, sloughing could occur, and cut and fill costs could increase substantially. Design Criteria The design of terraces should be determined by a civil engineer based upon actual site conditions. 98 Construction Specifications Terraces should be constructed according to Figure T- 1 for cut slopes and Figure T-2 for fill slopes. • Construct diversion ditches at the top of the slope if necessary to prevent or reduce surface water from running down the slope face. • The upper terrace should begin immediately below the top of the fill slope. Continue constructing terraces down to the toe of the slope. Terraces shall be a minimum of 6 feet wide. However, a minimum width of 8 feet is ideal so a crimper has access for mulching. • Terraces must drain to a stabilized outlet, such as a stabilized waterway, vegetated area, or other suitable outlet. Slope drains (SLOPE DRAIN [SD]) may be needed to convey surface runoff from the terraces or benches to the toe of the slope without causing erosion. Analysis of the local site conditions should determine the needed outlets. • Remove the loose material that collects at the end of terraces or benches and blend the ends of each terrace or bench into the natural ground surface. • Stabilize or re-vegetate the slope with methods applicable to the particular site. Maintenance Considerations The frequency of inspections should be in accordance with the Stormwater Management Plan (SWMP). Maintain terrace ridge height and outlet elevations. Remove sediment that has accumulated on the terrace to maintain capacity and a positive channel grade. If excessive seepage or surface runoff is a problem, control the seepage/runoff with appropriate drainage facilities. Take prompt action as needed to ensure proper drainage and slope stability. Repair rills and re-seed damaged areas as they develop. Substantial maintenance of the newly planted or seeded vegetation may be required. References City of Knoxville, Stormwater Engineering, Knoxville BMP Manual — Best Management Practices. July 2003 . http://www.ci .knoxvIIle.tn.us/engineering United States Environmental Protection Agency (EPA), National Pollutant Discharge Elimination System (NPDES). Construction Site Stormwater Runoff Control. Washington, D.C., February 2003 . http://cfpub.epa.gov/npdes/stormwater/menuofbmps/index.cfm 99 F1�1J!!E 1-4 tuaraabos - Cut Slope o:61 •,• • 71 �.:. Y.#a 1•: . ELOPE LBO C'L:: �i{,tai nQ;:,�r�}.ti'i:�:fit.••}G•:>.i�':i'.`. F N FLAT OI 111 CNICI-I LOOSE MERYL v >t�j T`.}J�:"n•i i'�C-t \1:tW@'/✓tt@/ T•• I.I'. ' I . Yi rltv:+l••./.%45%*, % y" 0.{,• S-.�f? t>••. ON •Ace 4'4dtJrdd4'•Y',x d4'r,�r: .1�4 4'iJT'f%ttri�• ICIER ad' 1 \\iJt:`,. 30 ;•"byC.A4�$T�:�'4 {'4`+LS{i•\'p• E3-��'• Jr'y`t%•4,%r,dd4't+•4'v.'Ir";•oWa,t o4..:r:`:'Y s[•'�/g'd iii ,.{t J.4\4ti$:...:Ai:• .;:.;: rv.: It<,hG•Svi,:s.AC ht.s.„4:0::,ti . ' •.;' 'rd°ado,:\IN;•4,ha : . IL 11411123 MW WSW 000AA 1N1�QW ,dsS L N0� 111 AVM= OUTLET. FIDE T-2 Terracing - Fill Slops =fig it I .r>iT� ila1 Ott Oft FIJQTIR ¢•.•3 Y•r:7 iy.V.VT•Y �. .:�. .{.rr:{•.. id ON Fl/OM o-c04.0;4_,'•;.b WO �}� �y�{� 4`�hr•.•••: ., { •-'4`:. WO ID CATCH : • 2 - LOOSE iKT Af! J , ~ 2. •s'4�<JSf�rIl4'E;dr'Np•/t!dv- 'n.'f'•.h`•>t�4tiJ�`,�•:h<tSti•V..h6-�1•,,`+. f 'yJ% �At'T@</j '%I•T4�l�l1G��'ti-. A f •••:2,1111 4 0 •ste07 :V.:Q@y474 4P-1 ;J!�v≥^ 5•45:>`• :::••,;•.1i.•. a 'v:Vvx.`,A%,'•.h` 'nr 'a9•hht.4t4:.:.,...r:....Y .\v' rti4. vH' f !•i % A7Fo�.� foQdY�{P vb4@e • messun 1. 71210C!S ! AL &opt 01171019D1 31t a 3t it A 6iQffi car. L Rai LEHCH AMs A TEfaiNE EiN1 Mar E311EEO MOO FEEL !Eta Id ti TO E.. -t1.2 Tracking Pad (TP) h.. x - l - -P If - •t :,-,!... ,4.5.4:14-sa.‘41- -A4: tie . 7�a `wV ,2 Description A stabilized construction entrance (i.e., tracking pad) is a pad of gravel where construction traffic leaves a site. The purpose of a stabilized access to a site is to minimize the amount of tracked mud that leaves a site. As a vehicle drives over the gravel tracking pad, mud and sediment are removed from the vehicle's wheels and off-site transport of soil is reduced. The gravel tracking pad also reduces erosion and rutting in the soil beneath the stabilized structure. The filter fabric separates the gravel from the soil below, preventing the gravel from being ground into the soil. The fabric also reduces the amount of rutting caused by vehicle tires by spreading the vehicle's weight over a larger soil area than just the width of the tire. Applicability Typically, stabilized construction accesses are installed at locations where construction traffic leaves or enters an existing paved road. However, the applicability of the site access stabilization should be extended to any roadway or entrance where vehicles will enter or leave the site. Limitations • Although stabilizing construction access is a good way to help reduce the amount of sediment leaving a site, some soil may still be deposited from vehicle tires onto paved surfaces. To further reduce the chance of these sediments polluting stormwater runoff, sweeping of the paved area adjacent to the stabilized site access is recommended. • Site traps or other secondary sediment controls are needed to capture that sediment that accumulates at the pad and may run off during storm events. Design Criteria No formal design is required. 101 Construction Specifications See Figure TP- 1 for installation details. • If the pad is constructed on a crowned road, a roadside ditch with check dams or sediment traps may be located on both sides of the road to collect runoff from the pad. If the road slopes to only one side of the road then only one roadside ditch with sediment controls will be needed. • Place a matrix of 2-inch to 4-inch washed stone, reclaimed or recycled concrete equivalent to a minimum of 12 feet wide and 20 feet in length. • All surface water flowing or diverted toward the construction access shall be piped across the entrance. If piping is impractical, a mountable berm with 5 : 1 slope will be permitted. Maintenance Considerations The frequency of inspections should be in accordance with the Stormwater Management Plan (SWMP). Stabilization of site accesses should be maintained until the remainder of the construction site has been fully stabilized. Stone and gravel might need to be periodically added to each stabilized construction site access to keep the access effective. Soil that is tracked off site should be swept up immediately for proper disposal. References Colorado Department of Transportation (CDOT), Erosion Control and Stormwater Quality Guide. 2002. http://www.coloradodot.info/programs/environmental/water- qual ity/documents/erosion-storm-quality United States Environmental Protection Agency (EPA), National Pollutant Discharge Elimination System (NPDES). Construction Site Stormwater Runoff Control. Washington, D.C., February 2003 . http://cfpub.epa.gov/npdes/stormwater/menuofbmps/index.cfm Horizon Environmental Services, Inc, Guidance Document Reasonable and Prudent Practices for Stabilization (RAPPS) of Oil and Gas Construction Sites. April 2004. 102 Figure TP - 1 FIGURE TP-1 Tracking Pad c'll INC 1'� 'R,WEL --1 i E"33f1hA CU wit Lr'.4,+'.4 ^•• l �/+. 4.`I.ON'c.ja . 'r.• r..;:�.4. amp v +4 4. , .j', .'q+FA�Yr { {yA Sf'$,4+t. • •Id DU titre LE BEP.Id {olrnorut)-3 ---BIC 191'J afi SEDIMENT CCOTRAL WEISIIIIE LE(.; K _•.- .,_ ,r,_.-ROAD: WE G(TCH WITH TIJRfd G.ff fpCµtiSLCCPE WE) II■IIIIIIIIIIIIIIIIIIa L BY SW 1111■UUI■11111■11111 IInuiIillq■Il uiMllll Isimu 1IIl1IIlIl ngilhgklllllqil uj ■III NI■Ills■1111111111■1111/11111/11111/ IIIIII■Illll■Iu11■IIII R[ 15!III!!` !I�!/■11111■�IIII�I11�1�i11111 - I■IIII!UPI!!llll11 II�I�uINItIillIWIiIlI�I11Yjfii:Yl3.:i�,L1111 -1, 11111=;J;LK JIIIIIIjll I1111!lllill■1111►11IIII■IIIII■III/■IIIIIII ItlI/Il'ilia:1111001C I■11111■1111■11111IIII■1111■11111■11111/ IIikIlli:.a;■IIIII■1111 ■�IUY�IYIYYIIYu ■IYIIIYII�IYI�IY[YI�IYIY► (Nil MIN Mill III I ilugEiIiiiiiklit I111■IIIII■IIIII■IIIII IMluibu auElmEli aa►D SIDE DITCH MID I■llill■IIUI■11111■ SEINIAEHT 1WF [11 PSLIPE slog kilig IIII■IIIII■11111 Wolf NOT 19 SOLE 103 Vegetative Buffer (VB) Q�'��L - -4 mil`A,LtZ� r�. ►., . • , y• v 'e" 1�yI- v*:; 1 . �IRI . p1 •i 1ft 1 , I , t ,V' , kr' , rn, . ,b , .. . , ..t: ,‘\47,, ., • lcia,./,, c,„: ..4.g i • .ks. er ). .1, \It M, r, r• . ,, i I is 40ir . r 1 �- ,1 1, If ' \�, S“, I a t .� 'i 1 . ,II , I I��. Description Vegetative buffers (also known as vegetative filter strips) are areas of either natural or established vegetation that are maintained to protect the water quality of neighboring areas. Vegetative buffers reduce the velocity of stormwater runoff, provide an area for the runoff to permeate the soil, contribute to ground water recharge, and act as filters to catch sediment. The reduction in velocity also helps to prevent soil erosion. The use of existing natural vegetation is preferred over newly established vegetation for the following reasons. • It can process higher quantities of stormwater runoff than newly seeded areas. • Does not require time to establish; • Has a higher filtering capacity than newly planted vegetation because aboveground and root structures are typically denser; • Reduces stormwater runoff by intercepting rainfall, promoting infiltration, and lowering the water table through transpiration; and • Provides a fully developed habitat for wildlife. Applicability Vegetative buffers can be used in any area that is able to support vegetation but they are most effective and beneficial on floodplains, near wetlands, along stream banks, and as stabilized outlets to runoff controls such as diversions, water bars, or culverts. Buffers are also effective in separating land use areas that are not compatible and in protecting wetlands or water bodies by displacing activities that might be potential sources of non-point pollution. Limitations • Vegetated buffers require plant growth before they can be effective and land on which to plant the vegetation must be available. • Although vegetative buffers help to protect water quality, they usually do not effectively counteract concentrated stormwater flows to neighboring or downstream wetlands. Design Criteria No formal design required. 104 Construction Specifications • Buffer widths should be determine after careful consideration of slope, vegetation, soils, depth to impermeable layers, runoff sediment characteristics, type and quantity of stormwater pollutants, and annual rainfall. Buffer widths should increase as the slope increases. • Fertilizing seeded or planted ground may enhance growth and improve its effectiveness as a buffer. • Direct sediment-laden water onto the naturally vegetated or stabilized planted ground. • Do not place any equipment, construction debris, or extra soil in the buffer area. Maintenance Considerations The frequency of inspections should be in accordance with the Stounwater Management Plan (SWMP). Keeping vegetation healthy in a recently established buffer requires routine maintenance, which (depending on species, soil types, and climatic conditions) may include weed control, fertilizing, liming, and irrigating. Once established or if using a naturally vegetated area, buffers do not require much maintenance beyond repairing or replacing damaged vegetation. Inspections focus on encroachment, gully erosions, density of vegetation, evidence of concentrated flows through the areas, and any damage from foot or vehicular traffic. If there are more than 6 inches of sediment in one place, it should be removed. Removal Removal is not necessary. References United States Environmental Protection Agency (EPA), National Pollutant Discharge Elimination System (NPDES). Construction Site Stormwater Runoff Control. Washington, D.C., February 2003 . http://cfpub.epa.gov/npdes/stormwater/rnenuofbmps/index.cfm 105 Wattles (W) •.Vr -.(�� LI} i�V�YDt�� I��rI�'4fh'l11• •. b.4%y.(•yi+y.i.n_J :rf i, +s�i' • 41.1�r�1� i .�: . f � J 1,410,31Pt '_yj 4' 1 111��r�'';ai+.i'r -..�L. r-� fir-'--Nr Jl t 4 • i . 1%, ..!' "r l ' .4 . . I �. Description A wattle consists of straw, flax, or other similar synthetic materials bound into a tight tubular roll. When wattles are placed at the toe and on the face of slopes, they intercept runoff, reduce its flow velocity, release the runoff as sheet flow, and provide removal of sediment from the runoff By interrupting the length of a slope, wattles can also reduce erosion. Applicability Wattles may be suitable: • Along the top, face, and at the grade breaks of exposed and erodible slopes to shorten slope length and spread runoff as sheet flow; • At the end of a downward slope where it transitions to a steeper slope; • Along the perimeter of a project;. • At the overflow location of sediment traps; • As check dams in unlined ditches; and • Around temporary stockpiles. Limitations • Wattles are not effective unless trenched. • Wattles at the toe of the slope greater than 5 : 1 should be a minimum of 20-inch diameter or installations achieving the same protection (i.e., stacked smaller diameter wattles, etc.). • Difficult to move once saturated. • If not properly staked and trenched in, wattles could be transported in high flows. • Wattles have a very limited sediment capture zone. • Wattles should not be used on slopes subject to creep, slumping, or landslide. • Wattles should not be used where periodic road or surface maintenance activities are expected. 106 Design Criteria No formal design is required. Construction Specifications Wattles should be either prefabricated rolls or rolled tubes of erosion control blankets. If using erosion control blankets, roll the length of erosion control blanket into a tube with a minimum of 8 inches in diameter and bind the roll at each end and every 4 feet along the length of the roll with jute-type twine. See Figure W-1 for wattles used to control erosion along slopes. Locate wattles on level contours spaced as follows. • Slope inclination of 4: 1 or flatter: Fiber rolls should be placed at a maximum interval of 20 feet. • Slope inclination between 4:1 and 2: 1 : Fiber rolls should be placed at a maximum of 15 feet. • Slope inclination 2: 1 or greater: Fiber rolls should be placed at a maximum interval of 10 feet. • Turn the ends of the wattles upslope to prevent runoff from going around the roll. • Stake wattles into a 2 to 4 inch deep trench with a width equal to the diameter of the wattle. Drive stakes at the end of each wattle and space 4 feet maximum on center. • If more than one wattle is placed in a row, the rolls should be overlapped, not abutted. Maintenance Considerations The frequency of inspections should be in accordance with the Stormwater Management Plan (SWMP). Repair or replace split, torn, unraveling, or slumping rolls. If the wattle is used as a sediment capture device, or as an erosion control device to maintain sheet flows, sediment that accumulates must be periodically removed in order to maintain wattle effectiveness. Sediment should be removed when sediment accumulation reaches half the distance between the top of the wattle and the adjacent ground surface. Removal Wattles are typically left in place. If wattles are removed, collect and dispose of sediment accumulation, and fill and compact holes, trenches, depressions, or any other ground disturbance to blend with adjacent ground. References California Stormwater Quality Association (CASQA). 2003 . Stormwater Best Management Practice Handbook: Construction. https://www.casga.org/store/products/tabid/154/p- 167- construction-handbookportal-initial-subscription.aspx 107 FIGURE W-1 Wattles Ground Level SEGNEHT WLLECTIt1'1 TC)P OF O U.t W?U0ENT YYC71LE SHOULD BE AT BOTtvh CF CLOSEST Le %MOM V6XTI E EliIt FIGURE W-2 FIGURE W-3 Wattles (Tied In) Wattles With Check Dam Application USED QJ r IIT l BIFPP StPE OR IN A Of D-I 'MN HEThU WITU Ffl FIJNO FL= _ CCM NCIT TO WAX 108 Windrow (WR) ( , i ,v‘...-.4_w.--, ,, ., _ -asy7' yta.'��' rX 1�tr - }� ? .r •. _ F f.s‘i.17Zr 41,ttiV. . 1.4.1 4T4‘!ttir- - i .1.'I WY i" '- ti- .�' 1 - I - , , •' . 'a N ', ~iso ' f' ir- ` f • • rK serf';- r . w . l A. t E c . : . .�. s •t, ` i i,J -- ' varactitt 11 - Y' � =. r . + - • ..1 . . _ - Description A windrow is a temporary ridge made up of natural materials that already occur on the project site. Brush windrows use small tree ranches, root mats, grass, leaves, stone, or other debris or material naturally available or left over from site clearing and grubbing (slash). Rock windrows use site gravel, stone, or rock. Soil windrows are created by clearing the top layers of soil. All types of windrows are placed along a level contour to slow, filter, and divert flow and act as an efficient form of sediment control. In some configurations, windrows are covered with a filter cloth to stabilize the structure and improve barrier efficiency. Applicability The drainage area for windrows must be no greater than 2 acres. In addition, the drainage slope leading down to a filter berm must be no greater than 2: 1 and no longer than 100 feet. The following are suitable applications. • Five to seven feet beyond the tow of slopes. • Along the site perimeter; • Along streams and channels or adjacent to roadways. • Around temporary spoil areas or other small cleared areas. 109 Limitations • Intended to be used only in gently sloping areas, and are not appropriate for high-velocity flow areas. • Brush windrows have limited usefulness because they are constructed of materials that decompose. • A large amount of material is needed to construct a useful windrow. Therefore, windrows are only applicable to sites where there is enough material from clearing and grubbing or rock material to form a sufficiently sized berm. • May be difficult to remove after construction. Design Criteria No formal design is required. Construction Specifications Brush (Slash) Windrow • Place material cleared form the site across the slope or swale. Material with a diameter larger than six inches should not be used. • Cut up brush if necessary and compact to avoid large voids within the barrier. • It is recommended, but not required, that the mound be covered with a filter fabric barrier to hold the material in place and increase sediment barrier efficiency. If using a filter fabric cover, bury the edge in a trench four inches deep and six inches wide on the drainage side of the barrier. This is done to secure the fabric and create a barrier to sediment while allowing storm water to pass through the water-permeable filter fabric. The fabric should be extended just over the peak of the brush mound and secured on the down-slope edge of the fabric by fastening it to twine or small-diameter rope that is staked securely. Rock Windrow • Place windrow along a level contour. Use well-graded, angular site gravel or crushed rock of medium to large diameter with larger rocks on the bottom. • If desired, cover with geotextile fabric or wire screen (especially if concentrated flows are expected) to help keep berm intact. Anchor fabric or wire by placing under the windrow or use stakes. • Trenching is not required. • Windrows should be spaced according to the steepness of the slope, with windrows spaced closer together as the slope increases. Soil Windrow • Place windrow along a level contour. Large clumps of dirt should be avoided. • If desired, cover with geotextile fabric or wire screen (especially if concentrated flows are expected) to help keep windrow intact. Anchor fabric or wire by placing under the windrow or use stakes. • Trenching is not required. • Windrows should be spaced according to the steepness of the slope, with windrows spaced closer together as the slope increases. 110 Maintenance Considerations The frequency of inspections should be in accordance with the Storm Water Management Plan (SWMP). If channels form through void spaces in the barrier, the barrier should be reconstructed to eliminate the channels. Ensure that sediment has not built up and that no damage has been done by vehicles. Accumulated sediment should be removed from the uphill side of the barrier when sediment height reaches between 1/3 and 1/2 the height of the barrier. Sediment should be disposed of and the filter material and/or fabric should be replaced if necessary. It is important that repairs be performed at the first sign of deterioration to ensure that the berm is functioning properly. Removal Remove windrows after uphill drainage areas are stabilized and/or seeded. Rock and brush may be left in place only if it does not cause any landscaping problems. Remove all manmade materials (wire, fabric and/or stakes). References Environmental Protection Agency (EPA), National Pollutant Discharge Elimination System (NPDES). Construction Site Storm Water Runoff Control. Washington, D.C., February 2003 http://cfpub.epa.gov/ndpes/stormwater/menufbmps/con_site.cfm Horizon. Environmental Services, Inc, Guidance Document Reasonable and Prudent Practices for Stabilization (RAPPS) of Oil and Gas Construction Sites. April 2004 111 Wind Erosion Control (WEC) !Ilipir r. ____ 4- _ 4, _ , 1 r- 1 {1 11. 4 c- yi- IV " cal teat, 1Pnilipllibio ji y_ . al r r .fP' r ' Description Wind erosion or dust control consists of applying water or other dust palliatives as necessary to prevent or alleviate dust nuisance generated by construction activities. Covering small stockpiles or areas is an alternative to applying water or other dust palliatives. Applicability Wind erosion controls BMPs are suitable during the following construction activities: • Construction vehicle traffic on unpaved roads • Drilling and blasting activities • Sediment tracking onto paved roads • Soils and debris storage piles • Batch drop from front-end loaders • Areas with unstabilized soil • Final grading/site stabilization Limitations • Watering prevents dust only for a short period and should be applied daily (or more often) to be effective. • Over watering may cause erosion. • Oil or oil-treated sub grade should not be used for dust control because the oil may migrate into drainageways and/or seep into the soil. • Effectiveness depends on soil, temperature, humidity, and wind velocity. • Chemically treated sub grades may make the soil water repellant, interfering with long- term infiltration and the vegetation/re-vegetation on the site. Some chemical dust suppressants may be subject to freezing and may contain solvents and should be handled properly. 112 • Asphalt, as a mulch tack or chemical mulch, requires a 24-hour curing time to avoid adherence to equipment, worker shoes, etc. Application should be limited because asphalt surfacing may eventually migrate into the drainage system. • In compacted areas, watering and other liquid dust control measures may wash sediment or other constituents into the drainage system. Implementation General Recently, the State Air Resources Control Board has, under the authority of the Clean Air Act, started to address air quality in relation to inhalable particulate matter less than 10 microns (PM- 10). Approximately 90 percent of these small particles are considered to be dust. Existing dust control regulations by local agencies, municipal departments, public works department, and public health departments are in place in some regions within California. Many local agencies require dust control in order to comply with local nuisance laws, opacity laws (visibility impairment) and the requirements of the Clean Air Act. The following are measures that local agencies may have already implemented as requirements for dust control from contractors: • Construction and Grading Permits: Require provision for dust control plants. • Opacity Emission Limits: Enforce compliance with Colorado air pollution control laws. • Increase Overall Enforcement Activities: Priority given to cases involving citizen complaints. • Maintain Field Application Records: Require records of dust control measures from contractor; • Stormwater Management Plan (SWMP): Integrate dust control measures into SWMP. Dust Control Practices Dust control BMPs generally stabilize exposed surfaces and minimize activities that suspend or track dust particles. For heavily traveled and disturbed areas, wet suppression (watering), chemical dust suppression, gravel asphalt surfacing, temporary gravel construction entrances, equipment wash-out areas, and haul truck covers can be employed as dust control applications. Permanent or temporary vegetation and mulching can be employed for areas of occasional or no construction traffic. Preventive measures would include minimizing surface areas to be disturbed, limiting onsite vehicle traffic to 15 mph, and controlling the number and activity of vehicles on a site at any given time. For chemical stabilization, there are many products available for chemically stabilizing gravel roadways and stockpiles. If chemical stabilization is used, the chemicals should not create any adverse effects on stormwater, plant life, or groundwater. Costs 113 Installation costs for water and chemical dust suppression are low, but annual costs may be quite high since these measures are effective for only a few hours to a few days. Inspection and Maintenance Considerations • Inspect and verify that activity-based BMPs are in place prior to the commencement of associated activities. While activities associated with the BMP are under way, inspect weekly during the rainy season and at two-week intervals in the non-rainy season to verify continued BMP implementation. • Check areas protected to ensure coverage. • Most dust control measures require frequent, often daily, or multiple times per day attention. 114 APPENDIX D TRAINING LOGS tit . . ap-4 9? C Ct E .. a� rt o E Cen Q a? O ca i Clse a? z Hello