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HomeMy WebLinkAbout1.17 SWMPGas Gathering S WMP EnCana TABLE OF CONTENTS 1.0 INTRODUCTION 1 1.1 Storm Water Runoff Permitting Requirements 1 1.2 Project Description and Background 2 1.3 Project Owner and Operator 2 2.0 CONSTRUCTION SHE DESCRIPTION 3 2.1 Site Location and Construction Area Description 3 2.2 Schedule of Construction Activities 5 2.3 Runoff Characteristics .. 5 2.4 Threatened and Endangered Species and Historic Places 5 3.0 POTENTIAL POLLUTION SOURCES 7 4.0 DESCRIPTION OF CONTROL MEASURES 8 4.1 Soil Erosion and Sediment Controls 8 4,1.1 Flume drainage crossings 9 4.1.2 Check dams 9 4.1.3 Hay bales 9 4.1.4 Rock protection 9 4.1.5 Rolled products . 9 4.1.6 Vegetative filters 10 4.1.7 Slope drainage relief 10 4.1.8 Straw wattles 10 4.1.9 Diversion bermlchannei 10 4.1.10 Catch basin 11 4.1.11 Gravel surfacing 11 4.1.12 Designated concrete wash areas 1 I 4.1.13 Seeding of Pipeline Corridors I I 4.1.14 Seeding of other disturbed areas .. 11 4.1.15 Additional BMP references 12 4.2 Storm Water Management Controls 12 4.3 Other Controls. 13 4.3.1 Waste management and disposal 13 4,3,2 Fuels and materials management 13 4.3.3 Construction Site Housekeeping 15 5.0 INSPECTION AND MAINTENANCE PROCEDURES 16 6.0 NON-STORMWATER DISCHARGES 18 7.0 FINAL STABILIZATION 19 7.1 Final Stabilization of Short -Tenn Disturbances 19 7.2 Final Stabilization of Long -Term Disturbances 19 8.0 CERTIFICATIONS 20 8.1 Owner/Applicant Certification 20 8.2 Contractor/Subcontractor Certification 21 Gas Gathering SWMP EnCana LIST OF FIGURES Figure 1 Project -Specific location map (to be added for each project) 6 Appendix A Appendix B Appendix C Appendix U LIST OF APPENDICES CPDS General Construction Storm Water Permit Typical Storm Water BMP Details Specifics of Administrative Operations, SWMP Supplement Form, and SWIVIP Inspection and Maintenance Form Gas Gathering Spill Prevention and Countermeasure Control Plan (SPCC) ii Gas Gathering SWMP EnCana 1.0 INTRODUCTION This Storm Water Management Plan (SWMP) is written to comply with the Colorado Department of Public Health and Environment's (CDPHE) General Permit No. COR - 03000 issued on June 30, 2002 and will expire on June 30, 2007, and related U.S. Environmental Protection Agency (USEPA) National Pollutant Discharge Elimination System (NPDES) storm water regulations. This SWMP is intended to address storm water management at all Gas Gathering pipeline and gas compression and/or treatment facility construction sites within the North and South Piceance units and may be periodically updated as needed to address planned developments, new disturbances, and other changes needed to manage storm water and protect surface water quality. This SWMP may need to be updated during the project life. Updates may include: 1. Revision of existing BMPs as needed to address sediment control, and 2. Deletion of BMPs and reduction in monitoring frequency for individual facility locations where interim and long -terra vegetation have been successfully established. 1.1 Storm Water Runoff Permitting Requirements The Federal Clean Water Act [Section 402(p)] requires that discharges of pollutants to waters of the United States from any point source be regulated by NPDES permits. In November 1990 the USEPA published final regulations that established application requirements for storm water associated with construction activity for soil disturbances of 5 acres or more be regulated as an industrial activity and covered by an NPDES permit. In December 1999 the USEPA published final Phase 11 NPDES regulations that established application requirements for storm water associated with construction activity for soil disturbances to be regulated as an industrial activity and covered by an NPDES permit. These regulations became effective July 1, 2002. Construction permits are required for oil and gas activities that disturb 5 or more acres during the life of the project or are part of a larger common plan of development. CDPHE considers a common plan of oil and gas development to mean development of several well pads and/or related infrastructure in a contiguous area either during the same time period or under a consistent plan for long-term development. The vast majority of gas gathering projects that create ground disturbance will be located within areas covered by existing EnCana storm water permits. In these cases, this SWMP will be supplemented by project -specific information (location map). 1 Gas Gathering SWMP EnCana 1.2 Project Description and Background EnCana Gathering Services (USA) Inc. (EnCana) is actively developing the natural gats resource in Western Colorado. EnCana's gas gathering division primarily conducts gathering and conveyance of natural through pipelines which are typically buried beneath the ground surface. Depending on the specific project gas compression and/or treatment may be required. All gas gathering construction projects will he covered by a state storm water permit and this SWMP is intended to be used for multiple construction projects. The specific project may be covered by an existing permit or if the project is located outside existing permit areas a new storm water permit will be obtained. 1.3 Project Owner and Operator The property owner and operator is EnCana. Their address is: EnCana Oil & Gas (USA), Inc. 2717 County Road 215 Parachute, Colorado 81635 Ph (970) 285-2600 Fax (970) 285-2691 The EnCana contact persons for the projects are Mr. Dewey Neely and Mr. Brad Akrum_ Mr. Neely can be contacted by phone at (970) 285-2632 and Mr. Ankrum can be contacted by phone at (970) 285-2630. EnCana wi l l be in charge of all aspects of the property and this project. Contractor(s) will do the actual construction but all work will be supervised by EnCana and all decisions will be made by EnCana. 2 Gas Gathering SWMP 2.0 CONSTRUCTION SITE DESCRIPTION 2.1 Site Location and Construction Area Description EnCana Gas gathering construction projects will be located in many areas within the North and South Piceance units. Gas gathering projects are typically pipelines or gas compression/treatment facilities. The 'vast majority of ground disturbance will be due to pipeline construction. Pipeline corridors are linear features having widths of 50 to 60 feet and lengths of less than a mile to many miles. Both the width and length of disturbance will vary depending on gas transportation needs and other factors. After a pipeline origin, destination, and preferred route have been identified, the following construction sequence is generally followed: 1. Surveys: topographic, vegetation, wildlife and archeology, as necessary. 2. Vegetation clearing (as necessary). If conducted, cleared vegetation will be placed in a windrow at the edge of the work arca, removed from the construction site, or burned depending on landowner requirements. 3. Topsoil stripping. Topsoil is removed from the work area and stockpiled in a windrow near the edge of the work area. 4. General grading. For pipeline segments that occur in relatively rough terrain general grading will be conducted to create a safe and workable ground surface. This is generally done to form a relatively level work surface on steep cross slopes and to reduce slopes in undulating terrain (arroyo and wash crossings). 5. Trench excavation. The trench needed for pipeline installation is generally located near the center of the ROW and is created by track -mounted excavators. The trench depth and width will vary on the number of pipes to be installed and the pipe diameter. Generally, a 4 -foot deep trench will be excavated. Trench spoils are cast into a windrow. 6. Pipe welding and placement. The pipe pieces are layed beside the trench and welded. Long segments of welded pipe are placed within the trench by sideboom dozers. 7. Pipe bedding. Trench spoils are handled by excavators equipped with bedding boxes. The bedding boxes remove larger rocks and the fine material is placed beside and over the pipe to prevent potential damage to the pipe. 8. Trench backfill. Bulldozers move soil from the trench spoils windrow to backfill the trench. 9. General grading. If general grading was conducted to facilitate pipeline construction these materials will he replaced and graded to recreate the pre - construction topography. 10. Topsoil placement. Topsoil will be moved from the window and redistributed across the surface of the disturbed area. 11 Vegetative material replacement/removal. Based upon landowner requirements, stripped vegetation may be hauled off-site or burned in the work area. At locations where it is required, vegetative material that was stripped and saved prior to topsoil removal will be distributed across the disturbed area_ Depending 3 Gas Gathering SWMP EnCana on the type of vegetation and method of seeding this may occur before or after the disturbed area is seeded_ 12. Seeding. The reclaimed disturbed area is seeded. The seed mix will vary depending on location and surface ownership. The seed mix will generally match the surrounding vegetation. 13. Application of erosion stabilization. Depending on terrain (e.g. steep slopes and drainage crossings) additional measures may be applied to provide for erosional stability of the reclaimed area. Generally rolled product will be placed on steep slopes and rolled product and/or rock will be placed at drainage crossings. The Length of time for pipeline constmction between initial ground -breaking and final reclamation will vary but is generally completed within 2 to 6 months. Final stabilization is considered complete when 70 percent of the pre -construction ground cover has been re-established. Construction of gas compression and gas treatment facility sites involves typical clearing and leveling operations, including: 1. Surveys: topographic, vegetation, wildlife and archeology, as necessary. 2. Vegetation clearing (as necessary). if conducted, cleared vegetation will be placed in a windrow at the edge of the work area, removed from the construction site, or burned depending on landowner requirements. 3. Topsoil stripping. Topsoil is removed from the construction area and stockpiled. 4. General grading. The facility location will graded to provide level building sites and may be graded to establish surface drainage patterns. 5. Facility specific grading. Individual facilities may require additional excavation to allow for construction of foundations. Excess soil will generally be used in general site grading. 6 Foundation construction. To support facilities (buildings, tanks, processing equipment, etc) foundations will be constructed. Foundations may consist of select backfill, concrete spread footings, or piles. 7. Facility construction. Buildings, tanks, processing equipment, etc will be constructed. 8. Gravel surfacing. Areas used for access, parking, or materials staging will typically be gravel surfaced. 9. Reclamation of unused areas. Areas not needed for facilities, roads, parking, or materials staging will generally be reclaimed. Salvaged topsoil will be spread and the vegetative seed mix will be applied. 10. Application of erosion stabilization.. Depending on terrain (e.g. steep slopes and drainage crossings) additional measures may be applied to provide for erosional stability of reclaimed areas. Rolled product will be placed on steep slopes (2h: l v or steeper) and rolled product and/or rock will be placed at drainage crossings. The length of time for facility construction will generally range from 6 to 12 months. Final stabilization of reclaimed areas is considered complete when 70 percent of the pre - construction ground cover has been re-established. 4 Gas Gathering SWMP EnCana 2.2 Schedule of Construction Activities Natural gas exploration, development and production activities are currently underway within the North and South Piceance business units. Existing and future pipeline construction corridors are included in this SWMP. For new disturbances, l3MPs will be installed prior to, during, and immediately following construction as practicable with consideration given to construction staging, safety, access, and ground conditions (e.g. frozen ground) at the time of construction. Development of the natural gas resource and construction of pipelines will likely continue for the next 10 years. Production and transport of natural gas will likely continue for the next 30 years, or more. 2.3 Runoff Characteristics Runoff characteristics are based on site topography, soil type, and soil/vegetative cover. Surface elevation ranges from approximately 5,000 to 9,000 feet Surface soils range from sands, silts, and clays to exposed bedrock. Slopes range from 1 to over 100 percent. Pipelines are typically located on valley floors and hillsides. Runoff coefficients are expected to range from 0.1 to 0.4. 2.4 "Threatened and Endangered Species and Historic Places Analysis of environmental effects of projects proposed on Federal lands is required by the National Environmental Policy Act (NEPA). This analysis is typically presented in an Environmental Assessment (EA) prepared by the Agency or a third -party contractor. Field surveys are conducted to assess the presence of threatened and endangered or special status plant and animal species. Field surveys are conducted to check for the presence of archeological artifacts. The EA also analyzes the environmental affects of the proposed action with respect to plants, animals, soils, recreation, and air and water quality. As needed, measures are specified to mitigate environmental affects caused by the project or the project may be redesigned to avoid detrimental affects. Agencies will also request cultural surveys for portions of projects portions that occur on privately owned lands and are connected to proposed actions on Federal land. 5 Gas Gathering SWMP EnCana Figure t This page intentionally left blank to be replaced by project -specific location map. fi Gas Gathering SWMP EnCana 3M POTENTIAL POLLUTION SOURCES Potential pollution sources associated with construction of pipelines and facility sites include: • Sediment resulting from erosion of soil stockpiles and other areas cleared of vegetation; • Leakage of fuels and lubricants from equipment and spills from fueling; • Trash and debris from clearing activities, construction materials, and workers; and • Fluids used for hydrostatic testing of the completed pipeline (if conducted, this is generally water but may be nitrogen or other gas). The most common source of pollution from construction sites is sediment, which can he carried away from the work site with storm water runoff and impact the water quality of a receiving stream. Clearing, grading, and otherwise altering previously undisturbed land can increase the rate of soil erosion over pre -disturbance rates. Petroleum products can also be potential storm water pollutants. These products are used in construction activities to power or lubricate equipment and include: fuel, gear oil, hydraulic oil, brake fluid, and grease. A copy of EnCana Gas Gathering's Spill Prevention and Countermeasure Control Ilan (SPCC) is given in Appendix D. Debris from material staging areas, residue from equipment cleaning and maintenance, and solid waste generated from land clearing operations and human activity (trees, brush, paper, trash, etc.) present other potential pollution sources within the construction site. Other materials on-site will include compressed gasses used in welding and chemicals used and stored on-site for use in pipeline installation. 7 Gas Gathering SWMP 4.0 DESCRIPTION OF CONTROL MEASURES 4.1 Soil Erosion and Sediment Controls EnCana The objective of erosion and sediment controls is to minimize the release of sediments to storm water runoff This can be accomplished through the use of structural and/or nonstructural controls. This section describes erosion and sediment controls to be used at active construction sites to minimize possible sediment impacts to storm water runoff. The proposed erosion control features include: • Construction of flumes at drainage crossings; • Placement of rolled product on fill slopes at flume locations; • Placement of silt fence, straw waddles, or hay bales as needed below the top of disturbed slopes (depending on slope gradient, length, and proximity to sensitive areas); • Placement of rolled product on slopes that are steep or long; • Placement of hay bale or rock check dams as needed in areas of concentrated flow; • Catch basins to retain runoff from gas compression and treatment construction sites; • Wash pits at sites where concrete will be used (facility sites); and • Permanent seeding of reclaimed pipeline corridors and areas not needed for long- term work access at compressor stations. The types and locations of structural BM Ps for each disturbed area will be determined as development progresses and construction plans are prepared (to be done prior to submitting the storm water permit application for a specific pipeline or compressor station construction project. BMPs generally function to control sediment through diverting ninon water away from disturbed areas, to control runoff water generated from disturbed areas, or to control erosion by stabilizing the soil surface. • Runon controls are those features that serve to collect and/or direct ninon water away from disturbed areas. Runon controls typically include diversion berms, channels, and flumes. • Runoff controls are those features that serve to collect and/or direct ninoff water Haat comes from disturbed areas. These features serve to collect and/or retain runofwater and remove sediment_ Runoff controls may include hay bales, check dams, silt fence, straw waddles, diversion berm/channels, catch basins, and slope drains. • Erosion controls are those features that serve to retain soil in-place. Erosion controls may include gravel surfacing, rolled products, rock protection, and vegetation. 8 Gas Gathering SWMP EnCana 4.1.1 Flume drainage crossings Flume drainage crossings will be used where the pipeline construction crosses drainage of sufficient size or irrigation ditches. At these locations, a culvert will be installed such that the inlet and outlet will extend at least 3 feet beyond the limit of fill. Fill material will then be placed over the culvert to create a work surface with a grade that is allows vehicle traffic and provides for safety. A typical flume layout is given in Appendix B. 4.1.2 Check dams Check dams should be installed in areas of concentrated flow. Check dams may be constructed of straw waddles, hay bales, or rock. Straw waddles may be used in areas where the volume of concentrated flow is expected to be minor. Hay bale check dams may be used in areas where the volume of concentrated flow is expected to be moderate. Rock check dams should be used in areas where the volume of concentrated flow is expected to be high or in areas where maintenance of straw wattles or bales is expected to be high. Typical check dam installation details are given in Appendix B. 4.1.3 Hay bales Hay bale check dams, at a minimum will be installed in areas of concentrated flow. Hay bale check darns should also be installed at suitable locations along new access roads. Typical hay bale installation details are given in Appendix 13. 4.1.4 Rock protection Rock protection may be installed in areas of concentrated flow. Rock protection may be necessary at the outlet of culverts or other drainage structures. Channels may be rock lined in areas where slopes are very steep or high water velocity is expected. A detail for typical rock protection at a culvert outlet is given in Appendix B. 4.1.5 Rolled products Rolled products cover a broad variety of manufactured products that are supplied in rolled packages that serve to provide a protective layer for underlying soil. Rolled products may include straw, aspen fibers, coconut fibers, or synthetic fibers_ They may be single or double -netted or may have no external netting. Generally, the service life, durability, and quality of product relate to their weight and cost. A single net, straw mat may suffice for a moderate slope where successful revegetation is expected within 6 months or less; a double net coconut fiber mat may be needed for steep slopes where revegetation is expected within 24 months or less; and a synthetic fiber turn reinforcement mat (TRM) may be needed for channel linings. These products are available from a variety of manufacturers including North American Green, American Excelsior, Enviroscape EMC, Contech Construction Products and others. 9 Gas Gathering SWMP EnCana Manufacturer's guidance and local experience should be considered before selecting a rolled product to use in a specific application. Rolled products should be installed according to the manufacturer's recommendations. Generally, the use of rolled products should be considered for post -construction stabilization of pipeline cothdor areas where slopes are steeper than 2h:1 v (horizontal:vertical). At facility sites rolled products will be used for post -construction stabilization of all slopes that are 2h:1 v, or steeper. 4.1.6 Vegetative filters Vegetative filters may be either standing vegetation in undisturbed areas or vegetative material salvaged from clearing operations. When using vegetative filters, consideration should be given to the area of disturbance that will contribute flow, distance to surface drainage, density of vegetation, and effectiveness of vegetation in slowing ntrtoff and removing sediment. 4.1.7 Slope drainage relief Rolling dips or water bars may be used to provide drainage of water from the pipeline corridor as needed to drain low areas or to reduce the amount of water flowing on the pipeline corridor. Slope drains may also be used to convey collected runoffwater down a disturbed slope. Depending on the location and type of drainage relief installed., additional sediment control features may be needed such as lining with rolled product or placement of erosion protection at the outlet. 4.1.8 Straw wattles Straw wattles (also called logs) are intended to capture and keep sediment on the slopes. Wattles are useful to temporarily stabilize slopes by reducing soil creep and sheet and rill erosion until permanent vegetation can be established. Wattles will last an average of one to two years. The slope may need to be prepared before the roils are placed. Small trenches are created across the slope on the contour. The trench should be deep enough to accommodate half the thickness of the roll (about 3"-5"). The trenches need to be 10 to 25 feet apart. The rolls need to be installed perpendicular to water movement, parallel to the slope contour, Start by installing rolls from the bottom of the slope. The rolls need to fit snugly against the soil. No gaps should be between the soil and roll. Willow or wooden stakes need to be driven through the roll and soil. There should only be 1 to 2 inches of stake exposed above the roll. The stakes should be installed every 4 feet. Typical straw wattle installation details are given in Appendix B. 4.1.9 Diversion berm/channel Diversion berms, channels, or combination structures may be used to divert run.on away from a disturbed area or to collect runoff and direct toward a central BMP (catch basin). A typical berm/channel detail is given in Appendix 13. 10 Gas Gathering SWMP EnCana 4.1.10 Catch basin Catch basins may be low-lying areas or areas contained within earthen berms. Catch basins operate by retaining a volume of water for a sufficient length of time so that sediment will fall out of suspension and be contained within the basin. Catch basins should be placed to collect runoff water, sized to retain an appropriate volume of water, and typically will have provision for controlled release of overtopping flows. Typical catch basin details are given in Appendix 13. 4.1.11 Gravel surfacing Gravel surfacing may be used to cover soil in areas of high traffic such as roads and facility areas. Gravel surfacing forms a layer that protects soil from wind and water erosion and prevents vehicle tracking. Gravel surfacing may be lost or displaced by vehicular traffic. Gravel surfaces should be inspected to identify the need for placement of additional gravel_ 4.1 .12 Designated concrete wash areas At facility sites where concrete will be used in construction wash areas will be designated. All concrete trucks will be required to use the designated wash area. The wash area will include provision for retaining all wash water. The wash and water retention areas will be located such that runon is diverted and all runoff is retained with the wash and water retention area. 4.1.13 Seeding of Pipeline Corridors After completion_ of construction within a pipeline corridor (see Section 2.1) the disturbed area (including associated staging areas) will be reseeded. Seed mix application will be dnnc in the next available seeding season. The revegetation seed mix should include annual, cereal crop seeds or sterile grass species (e.g. regreen) to help establish vegetative cover. The permanent seed mix, rate, application method, and supplemental materials will be determined by EnCana, the landowner, or land management agency as appropriate for the land ownership. In general, the revegetation seed mix will contain seeds of plants that are found in the surrounding areas. Reclaimed and seeded areas will be inspected to confirm vegetative growth and assess the need for re -seeding and/or weed control. Vegetative success is achieved when new growth reaches 70 percent of the pre -construction vegetative cover. 4.1.14 Seeding of other disturbed areas After completion of construction of facility sites areas not needed for access or work staging should be seeded. In general, this will include all areas not used for facilities, materials storage, or access. 11 Gas Gathering SWMP EnCana. The seed mix, rate, application method, and supplemental materials will be selected by EnCana, the land owner, or the land management agency as appropriate for the land ownership. Reclaimed and seeded areas will be inspected to confirm vegetative growth and assess the need for re -seeding andlor weed control. Vegetative success is achieved when new growth reaches 70 percent of the pre -construction vegetative cover. 4.1.15 Additional BMP references The structural and non-structural BMPs listed above are intended to include all BMPs that may be used for gas gathering projects. However, there may be situations where a BMP is needed but not included above or project personnel may need additional information on the use, specification, and maintenance of BMPs. Additional information resources are listed below: • For construction BMPs the Urban Drainage and Flood Control District, a Colorado front range group of city and county agencies has developed a BMP manual that is available on the Internet at http:flwww.udfcd.orglusdcm/vol3.htm • For construction BMPs and surface stabilization methods, the Alabama Soil and Water Conservation Committee has developed "Erosion Control, Sediment Control and Stormwater Management on Construction Sites and Urban Areas, Volume 1 Developing Plans and Designing Best Management Practices." This information is available on the Internet at http:Ilswcc.state.al.usiedf/ASWCC June 2003 Alabama handbook Constructio n E&S_Control.pdf • For access roads, the US Forest Service and Bureau of Land Management have developed "Low -Volume Roads Engineering, Best Management Practices Field Guide,,, which is available on the internet at http://www.blm.govibmp/field%20guide.htm 4.2 Storm Water Management Controls As development of a natural gas field progresses pipelines and facility sites will be planned and constructed. This SWMP is intended to provide: 1. Guidance for storm water management; 2. A list of suitable structural BMPs; 3. Guidance for revegetation, 4. Requirements for specification, installation, inspection and maintenance of BMPs; and 5. Requirements for inspection, documentation, and reporting of BMPs and revegetation. Given the number of pipelines and facilities that will be constructed within the North and South Piceance units and relatively uncertain project schedule, site-specific BMP requirements will be developed as plans for construction are finalized. These site- specific BMP plans will be developed and submitted to the storm water administrator. Site-specific BMP plans (SWMP supplement, form given in Appendix C) although not 12 Gas Gathering SWMP EnCana hound with are considered to be documents supplemental to this SWMP (see Specifics of Administrative Operations, in Appendix C). 'I'he storm water administrator will: 1. Maintain the SWMP, site-specific BMP plans, and a list of disturbed sites that need storm water inspections. 2. Ensure that storm water inspections are conducted as needed, that inpeetion reports are filed, and that necessary maintenance is conducted. 3. Ensure that reclamation grading and revegetation are conducted to standard and that revegetated areas arc inspected to determine if vegetative success has been achieved or if weed controls and/or reseeding as needed. 4. Ensure that the Gas Gathering storm water management program is conducted in accordance with the applicable storm water permits. Depending on the type and location of ground disturbing activities there may be a need for inclusion of new and different BMPs. In general, new developments should be planned with consideration for storm water quality (e.g. minimize disturbed area and maximize distance from drainages, as practicable). 4.3 Other Controls 4.3.1 Waste management and disposal Pipeline and facility site construction will generate various other wastes during the course of construction. Other wastes may include the following: • Trees and shrubs from clearing operations, • 'Trash and debris from construction materials and workers, and • Sanitary sewage. Each of these wastes will be managed so as to not contribute to storm water pollution. Trees and shrubs will be stockpiled outside of the work area or placed to provide additional sediment control. Construction trash and debris will be collected in containers and hauled off-site for disposal in suitable landfills. Sanitary waste will be containerized in portable toilets or other storage tanks with waste materials regularly pumped and transported off-site for disposal at approved facilities. 4.3.2 Fuels and materials management A copy of Gas Gathering's Spill Prevention and Countermeasure Control Plan (SPCC) is provided in Appendix D. Petroleum Products Petroleum products which may be present at the construction sites include: gasoline, diesel fuel, lubricant oils, hydraulic oils, used oils, and solvents. Gasoline and diesel fuel will be stored in portable storage tanks with secondary containment. Lubricant, 13 Gas Gathering SWMP EnCana hydraulic, and miscellaneous oils and solvents will be stored in 55 -gallon or smaller containers. Pollutants from petroleum products used during construction activities adhere easily to soil particles and other surfaces. Vehicles and equipment should not be fueled or serviced within 100 feet of any drainage. In case of a spill or leak, soils contaminated with petroleum products will be contained and removed to a proper disposal site. Proposed soil erosion and sediment control practices will aid in retention of spills or leaks. Use of secondary containment and drip pans will reduce the likelihood of spills or leaks contacting the ground. Proposed maintenance and safe storage practices will reduce the chance of petroleum products contaminating the drilling site. Oily wastes such as crankcase oil, cans, rags, and paper containing oils will be placed in proper receptacles and disposed of or recycled. An additional source of petroleum contamination is leaks from equipment and vehicles. Routine (informal and undocumented) inspections will be conducted to identify leaks and initiate corrective actions, if needed. The following guidelines for storing petroleum products will be used. • All product containers will be dearly labeled. • Drums will be kept off the ground within secondary containment and stored under cover if needed. • Fuel tanks will be stored within secondary containment. • Lids of drummed materials will be securely fastened. • Emergency spill response procedures will be available on-site. Persons trained in handling spills will be on call at all times. • Spill clean up and containment materials (absorbent, shovels, etc.) will be easily accessible. Spills will be immediately cleaned up and contaminated materials will be properly stored on site until they can be disposed of in accordance with applicable regulations. • Storage areas and containers will be regularly nionitored for leaks and repaired or replaced as necessary. Workers should be reminded about proper storage and handling of materials during weekly subcontractor or safety meetings Other Chemicals Products Management Additional materials may be used and stored on site for use in construction and equipment testing activities_ These materials will be stored appropriately and managed to minimize spills and leaks. Storage areas will be regularly inspected and any minor spills or leaks will be cleaned up immediately. Materials Management The pipeline contractor will maintain laydown or staging areas for equipment and materials storage at each site. These areas will be maintained with good housekeeping and will he inspected on a regular basis for spills, leaks, and potential contamination, 14 Gas Gathering SWMP EnCana 4.3.3 Construction Site Housekeeping Construction area housekeeping will consist of neat and orderly storage of materials and containerized fluids. Wastes will be temporarily stored in sealed containers and regularly collected and disposed of at off-site, suitable facilities. If spills occur prompt cleanup is required to minimize any commingling of waste materials with storm water runoff. Routine maintenance will be Iirnited to fueling and lubrication of equipment. Drip pans will be used during routine maintenance to contain spills or leaks. Any waste product from maintenance will be containerized and transported off site for disposal or recycling. There will be no major equipment overhauls conducted on site. Equipment will be transported offsite for major overhauls. Temporary and permanent roads will be installed and stabilized to minimize the transport of sediment from the road surface by mobile equipment. Cleanup of trash and discarded materials will be conducted at the end of each work day. Cleanup will consist of patrolling the work areas to pickup trash, scrap steel, other discarded materials, and any contaminated soil, These materials will be disposed of appropriately. 15 Gas Gathering SWMP EnCana 5.0 INSPECTION AND MAINTENANCE PROCEDURES To meet requirements of the General Permit inspection and maintenance of erosion and sediment controls must occur during the project. Continued inspection and maintenance is required after construction is completed. The inspection program will include the following: 1. A qualified person familiar with the SWMP and control measures will conduct the inspections. 2. Inspections will cover these area of the construction site: • Disturbed areas without stabilization, • Material storage areas, • Check dams, • Silt fence, • Surface waxer diversions, • Downgradient areas, • New access roads, and • Locations where vehicles enter or exit the site. 3. Inspections will occur at Least once every 14 calendar days and after precipitation or snow melt events that cause surface erosion. 4. Permanently stabilized areas will be inspected once per quarter. 5. A log of inspections will be kept. 6. Water quality will be assessed for all receiving streams and discharge areas during each inspection. 7. Disturbed areas and material storage areas that are exposed to precipitation will be inspected for evidence of pollutants entering nearby drainages. 8. BMPs will be inspected for evidence of deterioration, under -cutting, and build up of sediment. Sediment will be removed when it has built up one-third to one-half the height of hay bales or silt fence. 9. Roads used for vehicle access will be inspected for evidence of off-site sediment transport. 10. Following each inspection, the SWMP will be modified as necessary to include additional controls designed to correct identified problems. Revisions to the SWMP will be made within 14 days of the inspection_ 11. An inspection report summarizing the scope of the inspection, the name of the person conducting the inspection, date of inspection, and observations relating to the implementation will he prepared. Inspection reports will be retained for at least 3 years from the date that the site is finally stabilized. 12. Actions taken to modify any storm water control measure will be recorded and maintained with the SWMP supplement. 13. If no deficiencies are found during the inspection, the report will contain certification that the site is in compliance with the SWMP. Signatures will be in accordance with the General Permit Conditions, Part E. 1 (Appendix A). 16 Gas Gathering SWMP EnCana Maintenance will include prompt repairs and/or adjustments to any erosion and sediment control structures that are deteriorating or found to be perforn}ing inadequately. Repairs should be made as soon as possible and prior to the next anticipated storm event. LnCana or designated contractor(s) will maintain, on-site all materials necessary to make any reasonably expected repairs such as silt fence, hay bales, and stakes. 17 Gas Gathering SWMP EnCana 6.0 NON-STORMWATER DISCHARGES No non -storm water discharges are anticipated frorn gas gathering construction projects. Possible exceptions include lire prevention/suppression or dust control activities. 1R Gas Gathering SWMP t nCana 7.0 FINAL STABILIZATION 7.1 final Stabiliiation of Short -Term Disturbances Short-term disturbances are those areas disturbed for a short-term, typically less than a year, such as constructing a pipeline. These areas will be reclaimed and vegetated shortly following the completion of construction. Final stabilization is reached when all soil disturbing activities at the site have been completed and uniform vegetative cover has been established with a density of at least 70 percent of the pre-dislurbanee levels or equivalent permanent, physical erosion reduction methods have been employed. For short-term disturbances where final stabilization will be achieved almost exclusively through vegetation establishment permanent physical methods will be limited to rock erosion protection. Establishment of vegetation will be conducted as described in Sections 4.1.13 and 4.1.14. 7.2 Final Stabilization of Long -Term Disturbances Long-term disturbances are those areas disturbed for the purpose of constructing and operation of long-term use facilities, estimated to be 30 plus years for natural gas development. These areas will reach [ural stabilization through both methods allowed under the permit conditions which arc establishment of uniform vegetative cover with a density of 70 percent of the pre -disturbance levels or equivalent permanent, physical erosion reduction methods. Areas at facility sites which are not used for the facilities themselves, access roads, materials storage yards. or other work areas will be stabilized with vegetation as described above for short-term disturbances. Areas at facilities sites that include facilities, access roads, materials storage yards, and other work areas will be stabilized with the use of permanent, physical erosion reduction methods which include, but are not limited to: l Surface hardening -- covering of the soil surface with hardened products such as concrete or asphalt pavement, 2. Surface covering — covering of the surface soil with structure that inhibits contact of precipitation with the soil surface which is generally considered to be placement of a structure (building or tank) aver the soil surface. 3. Gravel surfacing -- gravel surfacing will be applied in areas such as access roads, materials storage yards, and other work surfaces. Some gravel may be lost due to erosion from intense precipitation events or due to vehicle traffic. Gravel surfaces will be periodically inspected to determine the need for gravel replacement. Gravel surfaces will be replaced or repaired (through grading) when inspection reveals that the gravel surface is no longer effectively covering the soil surface. 19 Gas Gathering SWMP EnCana 8.0 CERTIFICATIONS 8.1 Owner/Applicant Certification I certify under penalty of law that this document and all attachments were prepared under my direction of supervision in accordance with a system designed to assure that qualified personnel properly gathered 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, that the information is 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. Signatures: Name: Dewey Neely Brad Ankrnrn Title: Date: Owner Name: EnCana Oil & Gas (USA), Inc. Owner Address: 2717 County Road 215 Parachute, CO 81635 Site Name and Location: To be specified in individual pipeline and/or facility site storm water permit applications (See Figure 1) Gas Gathering SWMP EnCana 8.2 Contractor/Subcontractor Certification All contractors and subcontractors that will perform construction activities that could impact stoma water will be familiar with the SWMP and will sign the following certification. Contractor Certification I certify under penalty of law that 1 understand the terms and conditions of the EnCana Gas Gathering SWMP and associated CDPS General Permit that authorizes storm water discharges associated with industrial activity from the construction sites identified as part of this certification. Signature: Name: Title: Date: Representing: Company: Address: Address: Phone: Work to be Conducted: Activity 1: Activity 2: Activity 3: Activity 4: 21 APPENDIX A CIPS General Construction Storm Water Permit Page 2of17 Permit No. COR -030000 CDPS GENERAL PERMIT STORMWATER DISCHARGES ASSOCIATED WITH CONSTRUCTION ACTIVITY AUTHORIZATION TO DISCHARGE UNDER THE COLORADO DISCHARGE PERMIT SYSTEM In compliance with the provisions of the Colorado Water Quality Control Act, (25-8-101 et seq., CRS, 1973 as amended) and the Federal Water Pollution Control Act, as amended (33 U.S.C. 1251 et seq.; the "Act"), this permit authorizes the discharge of stormwater associated with construction activities certified under this permit, from those locations specified throughout the State of Colorado to specified waters of the State. Such discharges shall be in accordance with the conditions of this permit. This permit specifically authorizes the facility listed on page 1 of this permit to discharge stormwater associated with construction activity, as of this date, in accordance with permit requirements and conditions set forth in Parts I and If hereof. All discharges authorized herein shalt be consistent with the terms and conditions of this permit. This permit and the authorization to discharge shall expire at midnight, June 30, 2007. Issued and Signed this day of COLORADO DEPARTMENT OP PUBLIC HEALTH AND ENVIRONMENT J. David Holm, Director Water Quality Control Division TABLE OF CONTENTS PART I A. COVERAGE UNDER THIS PERMIT 3 1. Authority to Discharge 3 a) Applicable Sections 3 2. Industries Covered Under this Permit 3 a) Definitions: 3 b) Types of Activities Covered by this Permit: 3 3. Permit Coverage Without Application 3 a) Applicable Sections 3 b) Local Agency Authority 3 c) Permit Coverage Termination 4 d) Compliance with Qualifying Local Program 4 e) Full Permit Applicability 4 4. Application, Due Dates 4 a) Application Due Dates 4 b) Summary of Application 4 5. Permit Certification Procedure[ 4 a) Request for Additional Information . 5 b) Automatic Coverage 5 c) Individual Permit Required 5 d) Temporary Coverage 5 e) General. vs. Individual. Permit Coverage 5 E) Local Agency Authority 5 6. Inactivation Notice 5 7. Transfer of Permit 5 8. Permit Expiration Date 6 9. Individual Permit Criteria. 6 R. CONTENTS OF TER ST©RMWATER MANAGEMENT PLAN 6 1. Site Description 7 2. Site Map 7 3. BMPs for Stormwater Pollution Prevention 7 a) Erosion and Sediment Controls 7 b) Materials Handling and Spill. Prevention. 8 4, Final Stabilization and Longterm Stormwater Management 9 5, Other Controls 8 6. Inspection and Maintenance 8 C. TERMS AND CONDITIONS 8 1. General Limitations B 2. Prohibition of Non-stormwater Discharges 9 3. Releases in Excess of Reportable Quantities 9 4. Stormwater Management Plans 9 a) Signatory Requirements 9 b) SWMP Review/Changes 9 5. Inspections 9 a) Active Sites 9 b) Completed Sites 10 c) Winter Conditions 10 6. Reporting..,, 10 7. SWMP Submittal Upon Request 10 D. ADDITIONAL DEFINITIONS 10 -2a- TABLE ole CONTENTS (cont.) E. GRL RRAL REQUIREMENT'S 11 1. Signatory Requirements 11 2. Retention of Records 12 PART II A. MANAGEMENT REQUIREMENTS 12 1. Change in Discharge 12 2. Special Notifications - Definitions 12 3. Noncompliance Notification 13 4. Submission of Incorrect or Incomplete Information__ 13 5. Bypass 13 6. Upsets 13 7. Removed Substances 14 8. Minimization of Adverse Impact 14 9. Reduction, Loss, or Failure of Treatment Facility 14 10. Proper Operation and Maintenance 14 B. RESPONSIBILITIES 14 1. Inspections and Right to Entry 14 2. Duty to Provide Information 15 3. Trausfer of Ownership or Control 15 4. Modification, suspension, or Revocation of Permit By Division 15 5. Permit Violations 16 6_ Legal Responsibilities. 16 7. Severability 16 8. Renewal Application 17 9. Confidentiality 17 10. Fees . 17 11. Requiring an Individual CDPS Permit 17 -2b- PART 1 A. COVERAGE UNDER 'I1-118 PERMIT I . Authority to Discharge PART I Page 3 Permit No. COR -030000 tinder this permit, construction activities, including clearing, grading, and excavation, are granted authorization to discharge storrnwater associated with construction activities into waters of the state of Colorado. a. Applicable Sections: This permit is made up of several parts, not all of which ripply to all permittees. The permittee will be responsible for determining and then complying with the applicable sections, depending upon whether or not a Qualifying Local Program covers the site. For sites not covered by a Qualifying Local Program, all Paris of the permit except Part I.A.3 apply. 2. Industries Covered Under this Permit a) Definitions: 1) Stormwater: Stormwatcr is precipitation -induced surface runoff. 2) Construction activity: Construction activity includes clearing, grading and excavation activities. Construction does not include routine maintenance performed by public agencies, or their agents to maintain original line and grade, hydraulic capacity, or original purpose of the facility. 3) Small construction activity: Storrnwatcr discharge associated with small construction activity means the discharge of stormwater from construction activities that result in land disturbance of equal to or greater than one acre and less than five acres. Small construction activity also includes the disturbance of less than one acre of total land area that is part of a larger common plan of development or sale, if the larger common plan will ultimately disturb equal to or greater than one and less than Eve acres. 4) Qualifying Local Program: This permit includes conditions that incorporate qualifying local erosion and sediment control program (Qualifying local Program) requirements by reference. A Qualifying Local Program is a municipal stormwater program for stormwater discharges associated with small construction activity that has been formally approved by the Division. 5) Uiher ❑efini ns: Definitions of additional terms can be found in Part ID. of this permit_ b) Types of Activities Covered by Ibis Permit: This permit may authorize all new and existing discharges of stormwater associated with construction activity. This includes stormwater discharges from areas that are dedicated to producing earthen materials, such as soils, sand and gravel, for use at a single construction site. This permit also includes stormwater discharges from dedicated asphalt batch plants and dedicated concrete hatch plants. This permit does not authorize the discharge of mine water or process water from such areas. 3. Permit Coverage Without Application — for small construction activities under a Qualifying Local Program only If a construction site is within the jurisdiction of a Qualifying Local Program, the operator of the construction activity is authorized to discharge stormwater associated with small construction activity under this general permit without the submittal of an application to the Division. a) Applicable Sections: For sites covered by a Qualifying Local Program, only Parts I.A.1, 1.A.2, 1.A,3, 1.C.1, 1.C2, 1.C.3, 1.D and Part i t of this permit, with the exception of Parts ll.A.l,11.B.3, II.B.8, and I1.B 10, apply. b) Local Agency Authority: This pennit does not pre-empt or supersede the authority of local agencies to prohibit, restrict, or control discharges of stormwater to storm drain systems or ocher water courses within their jurisdiction. PART x Page 4 Permit Mo. COR -030000 A. COVERAGE UNDER 'ins PERMF'f (cont.) c) Permit Coverage Termination: When a site has been finally stabilized, coverage under this permit is automatically terminated. d) Compliance with Qualifying Loral Program: A construction site operator that has authorization to discharge under this permit under Part t.A.3 shall comply with the requirements of the Qualifying Local Program with jurisdiction over the site. e) Full Permit Applicability: The Division may require any owner or operator within the jurisdiction of a Qualifying Local Program covered under this permit to apply for and obtain coverage under the full requirements of this permit. The owner or operator must be notified in writing that an application for hill coverage is required. When a permit certification under this permit is issued to an owner or operator that would otherwise be covered under Part I.A.3 of this permit, the full requirements of this permit replace the requirements as per Part 1.A,3 of this permit, upon the effective date of the permit certification. A site brought under the full requirements of this permit must still comply with local stormwater management requirements, policies or guidelines as required by Part Z.C.I .lr of this Permit. 4. Anntieation, Due Dates a) Application Dtie Dates: At feast tea days prior to the commencement of construction activities, the operator of the construction activity shall submit an application form as provided by the Division, with acertification that the Stormwater Management Plan (SWMP) is complete. One original completed discharge permit application shall be submitted, by mail or hand delivery. to: Colorado Department of Public Health and Environment Water Quality Control Division WQCD-P-U2 4300 Cherry Creek Drive South Denver, Colorado 8024 6-1 53 0 b) Summary of Application: The application requires, at a minimum, the following: 1) The operators name, address, telephone number, tax payer identification number (or employer identification number), and the status as Federal, State, private, public or other entity; 2) Name, county and location of the construction site, including the latitude and longitude to the nearest I5 seconds of the approximate center of the construction activity; 3) A brief description of the nature of the construction activity; 4) The anticipated starting date of the project and the anticipated schedule of completion 5) Estimates of the total area of the site, the area of the site that is expected to be disturbed, and the total area of the larger common plan of development or sale to undergo disturbance; 6) The name of the receiving water(s), or the municipal separate storm sewer system and the ultimate (i.e., named) receiving water(s); 7) Certification that the SWMP for the construction site is complete (see Part I.S. below); and 8) 'the signature of the applicant signed in accordance with Part I.E.] of this permit, 5. Permit Certification Procedures If the general permit is applicable to the applicant's operation, then a certification will be developed and the applicant will be authorized to discharge stormwater under this general permit. PART 1 Page 5 Permit No. COR -030000 A. COVERAGE UNDER THIS PERMIT (cont.) a) Request fur Additional Information: The Division shall have up to ten days after receipt of the above information to request additional data andlor deny the authorization fur any particular discharge. Upon receipt of additional information, the Division shall have an additional ten days to issue or deny authorization for the particular discharge. (Notification of denial shall be by letter, in cases where coverage under an alternate general permit or an individual permit is required, instead of coverage under this permit.) h) Automatic Coverage: if the applicant does not receive a request for additional information or a notification of denial from the Division dated within ten days of receipt of the application by the Division, authorization to discharge in accordance with the conditions of this permit shall be deemed granted. c) Individual Permit Required: If, after evaluation of the application (or additional information, such as tate SWMP), it is found that this general permit is not applicable to the operation, then the application will be processed as one for an individual permit. The applicant will be notified ofthc Division's decision to deny certification under this general permit. For an individual permit, additional information may be requested, and 180 days will be required to process the application and issue Ibe permit. d) Temporary Coverage: Notwithstanding Parts LA.5.a-c, above, the Division reserves the right to temporarily cover stormwater discharge from construction activity under general permits, even though individual permit coverage may be marc appropriate. Certification of these activities under a general permit does not in any way infringe an the Division's right to revoke that coverage and issue an individual permit or amend an existing individual permit. e) General vs. Individual Permit Coverage: Any owner or operator authorized by this permit may request to be excluded from the coverage of this permit by applying for an individual COPS permit. The owner or operator shall submit an individual application, with reasons supporting the request, to the Division at least 180 days prior to any discharge. f) Local Agency Authority: This permit does not pre-empt or supersede the authority of local agencies to prohibit, restrict, or control discharges of stormwater to storm drain systems or other water courses within their jurisdiction. 6. Inactivation Notice When a site has been finally stabilized in accordance with the SWMP, the operator of the facility must submit an Inactivation Notice that is signed in accordance with Part 1.E,1. of this permit. The Inactivation Notice form is available from the Division and includes: a) Permit certification number, b) The permittees name, address, telephone number; c) Name, location, and county for the construction site for which the application is being submitted. d) Certification that the site has been finally stabilized, and a description of the final stabilization method(s). An inactivation form may not be required for small construction activities if application was made for coverage with a completion date less than 12 months from the start ofconstruction activity. In such cases, permit certification may be authorized for a predetermined period from 3 to 12 months. The permit certification will include the automatic expiration date for permit coverage, If permit coverage beyond that date is needed (i.e., the site has not been finally stabilized), the permittee must submit an extension request fonn to the Division at least 10 days prior to the expiration date. 7, Transfer of Permit When responsibility for storrnwater discharges at a construction site changes from one individual to another, the permittee shall submit a completed Notice of Transfer and Acceptance of Terms ofa Construction General Stormwater Discharge Permit Certification that is signed in accordance with Part I.E.I. of this permit. The Notice of Transfer form is available from the Division and includes: PART I Page 6 Permit No. COR --030000 A. COVERAGE UNDER THIS PERMIT(cont.) a) Permit certification number. b) Name, location, and bounty for the construction site for which the application is being submitted. c) The current permittec`s name, address, telephone number and the status as Federal, State, private, public or other entity. d) The new permittee's name, address and telephone number and the status as Federal, State, private, public or other entity. e) Certification that the new pennitteo has reviewed the permit and SWMP and accepts responsibility, coverage and liability for the permit. f) Effective date of transfer. If the new responsible party will not complete the transfer form, the permit may be inactivated if the permittee has no legal responsibility, through ownership or contract, for the construction activities at the site. In this case, the new operator would be required to obtain permit coverage separately. S. Permit Eaviration Date Authorization to discharge under this general permit shall expire on June 30, 2007. The Division must evaluate and reissue this general permit at least once every five years and must recertify the applicant's authority to discharge under the general permit at such time. Any permittee desiring continued coverage under the general permit must reapply by March 31, 2007. The Division will determine if the applicant may continue to operate under the terms of the general permit. An individual permit wilt be required for any facility not reauthorized to discharge under the reissued general permit. 9. individual Permit Criteria Aside from the activity type, the Division may use other criteria in evaluating whether an individual permit is required instead of this general permit. This information may conte from the application, SWMP, or additional information as requested by the Division, and includes, but is not limited to, the following: a) the quality ofthe receiving waters {i,e., the presence of downstream drinking water intakes or a high quality fishery, or for preservation of high quality water); b) the size of the construction site; c) evidence of noncompliance under a previous permit for the operation; d) the use of chemicals within the stormwater system. i'n addition, an individual permit may be required when the I)ivision has shown or has reason to suspect that the stormwater discharge may contribute to a violation of a water quality standard. B. CONTENTS OF THE STORMWATER MANAGEMENT PLAN The SWMP shall be prepared in accordance with good engineering, hydrologic and pollution control practices. (The SWMP need not be prepared by a registered engineer.) The main objective of tate plan shall be to identify Best Management Practices (BMPs) which when implemented will meet the terms unci conditions of this permit (see Part I.C., below). The plan shall identify potential sources of pollution (including sediment) which may reasonably be expected to affect the quality of stormwater discharges associated with construction activity from the facility, In addition, the plan shall describe and ensure the implementation of BMPs which will be used to reduce the pollutants in stonnwater discharges associated with construction activity. Construction operations must implement the provisions of the SWM P required under this part as a eonditinn of this permit. The SWMP shall include the following items, at a minimum: PART 1 Page 7 Permit No. COR -030000 13. CONTENTS OF THE STORM -WATER MANAGEMENT PLAN (cont.) 1. Site Description Each plan shall provide a descripiinn of the following: a) A description of the construction activity, b) The proposed sequence for major activities. c} Estimates of the total area of the site, and the area of the site that is expected to undergo clearing, excavation or grading. d) An estimate of the runoff coefficient of the site before and after construction activities are completed and any existing data describing the soil, soil erosion potential or the quality of any discharge from the site. e) A description of the existing vegetation at the site and an estimate of the percent vegetative ground cover. t) The location and description of any other potential pollution sources, such as vehicle fueling, storage of fertilizers or chemicals, etc. g) The location and description of any anticipated non-stormwater components of the discharge, such as springs and landscape irrigation return flow. h) The name of the receiving water(S) and the size, type and location of any outfall or, if the discharge is to a municipal separate storm sower, the name of that system, the location of the storm sewer discharge, and the ultimate receiving water(s), 2. Site Malt Each plan shall provide a generalized site map or maps which indicate: - construction site boundaries all areas of soil disturbance areas of cut and fill areas used for storage of building materials, soils or wastes location of any dedicated asphalt or concrete batch plants location of major erosion control facilities or structures springs, streams, wetlands and other surface waters boundaries of 100 -year flood plains, if determined. 3. BMPs for Stormwater Pollution Prevention The plan shall include a narrative description of appropriate controls and measures that will be implemented before and during construction activities at the facility. The plan shall clearly describe the relationship between the phases of construction and the implementation and maintenance of controls and measures. For example, which controls will be implemented during each of the following stages of construction: clearing and grubbing necessary for perimeter controls, initiation of perimeter controls, remaining clearing and grubbing, road grading, storm drain installation, tidal grading, stabilization, and removal of control measures. The description of controls shall address the following minimum components: a) Erosion and Sediment f^tr rots, 1) Structural Practices. A description of structural site management practices which will minimize erosion and sediment transport. Practices may include, but are not limited to: straw bales, silt fences, earth dikes, drainage swales, sediment traps, subsurface drains, pipe slope drains, inlet protection, outlet protection, gabions, and temporary or permanent sediment basins. 2) Non -Structural Practices. A description of interim and permanent stabilization practices, including site- specific scheduling of the implementation of the practices. Site plans should ensure that existing vegetation is preserved where possible and that disturbed areas are stabilized. Non-structural practices may include, but are not limited to: temporary seeding, permanent seeding, mulching, geotextiles, sod stabilization, vegetative buffer strips, protection of trees, and preservation of mature vegetation. PART 1 Page 8 Permit No. COR -030000 B. CONTENTS OF THE STORM WA'T'ER MANAGEMENT PLAN (cont.) b) Materials Handling and Spill Prevention. The SWMP shall identify any procedures or significant materials (see definitions at Part I,D_) handled at the site that could contribute pollutants to runoff, These could include sources such as: exposed storage of building materials, fertilizers or chcmieals; waste piles; and equipment maintenance or fueling procedures. Areas or procedures where potential spills can occur shalt have spill prevention and response procedures identified. Measures to control stormwater pollution from dedicated concrete batch plants or dedicated asphalt batch plants covered by this certification, must be identified in the SWMP. 4. Final Stabilization and Longterm Stormwaler Management The plan shall include a description of the measures used to achieve final stabilization and measures to control pollutants in stormwater discharges that will occur after construction operations have been completed. Final stabilization is reached when all soil disturbing activities al the site have been completed, and uniform vegetative covet has been established with a density of at least 70 percent of pre -disturbance levels, or equivalent permanent, physical erosion reduction methods have been employed. FOr purposes of this permit, establishment of a vegetative cover capable of providing erosion control equivalent to pre- existing conditions at the site can be considered final stabilization. The permittee will be responsible for providing to the Division the documentation to make this comparison. The Division may, after consultation with the permittee and upon good cause, amertd the final stabilization criteria for specific operations. 5. Other Controls The plan shalt include a description of other measures to control pollutants in stormwater discharges, including plans for waste disposal and limiting off-site soil tracking. 6. lnsnection and Maintenance The plan shalt include a description of procedures to inspect and maintain in good and effective operating condition the vegetation, erosion and sediment control measures and other protective measures identified in the SWMP. C. TERMS AND CONDI TIONS 1. General Limitations The following limitations shall apply to alt discharges covered by this permit: a) Stormwater discharges from construction activities shall not cause or threaten to cause pollution, contamination or degradation of State waters. b) Concrete wash water shall not be discharged to slate waters or to storm sewer systems. e) Bulk storage structures for petroleum products and other chemicals shall have adequate protection so as to contain all spills and prevent any spilled material from entering State waters. d) No chemicals are to be added to the discharge unless permission for the use of a specific chemical is granted by the Division. In granting the use of such chemicals, special conditions and monitoring may be addressed by separate letter. e) The Division reserves the right to require sampling and testing, on a case-by-case basis, in the event that there is reason to suspect that compliance with the SWMP is a problem, or to measure the effectiveness of the BMPs in removing pollutants in the effluent. Such monitoring may include Whole Effluent Toxicity testing. PART 1 Page 9 Permit No. COR -030000 C. TERMS ANI) CONDITIONS (cont.) t) All wastes composed of building materials must be removed from the site for disposal in licensed disposal facilities. No building material wastes or unused building materials shall be buried, dumped, or discharged at the site. g) Off-site vehicle tracking of sediments shall be minimized_ It) All dischargers must comply with the lawful requirements of municipalities, counties, drainage districts and other local agencies regarding any discharges of stormwater to storm drain systems or other water courses under their jurisdiction, including applicable requirements in municipal stormwater management program developed to comply with CDPS permits. Dischargers must comply with local stormwater management requirements, policies or guidelines including erosion and sediment control. 2. Prohibition of Non-Stormwater Discharges a) Except as provided in paragraph b, below, ail discharges covered by this permit shall be composed entirely of stormwater. Discharges of material other than stormwater must be addressed in a separate CDPS permit issued for that discharge. b) Discharges from the following sources that are combined with stormwater discharges associated with construction activity may be authorized by this permit, provided that the non-stormwatcr component of the discharge is identified in the SWMP (see Part I.B.i.g of this permit): - fire fighting activities - landscape irrigation return flow - springs 3. Releases in Excess of Reportable Quantities This permit does not relieve the permittee of the reporting requirements of 40 CFR 110, 40 CFR 117 or 40 CFR 302. Any discharge of hazardous material must be handled in accordance with the Division's Notification Requirements (see Part Ii.A.3 of the permit). 4. Stormwater Manatrcrnent Plans Prior to commencement of construction. the stormwater management plan (SWMP) shall be implemented for the constriction site covered by this permit. a) Signatory Requirements: The plan shall be signed in accordance with Part LE.1., with one retained on site. b) SWMP Review/Changes: The permittee shall amend the plan 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 the 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 activity. 5. Inspections a) Active Sites - For sites where construction has not been completed, the permittee shall make a thorough inspection of their stormwater management system at least every 14 days and after any precipitation or snowmelt event that causes surface erosion. 1) The construction site perimeter, disturbed areas and areas used for material storage that are exposed to precipitation shall he inspected for evidence of, or the potential for, pollutants entering the drainage system. Erosion and sediment control measures identified in the SWMP shall be observed to ensure that they are operating correctly. PART 1 Page 10 Permit No. COR -030000 C. TERMS AND CONDITIONS (cont.) 2) !Rased on the results of the inspection, the description of potential pollutant sources, and the pollution prevention and control measures that are identified in the SWMP shall be revised and modified as appropriate as soon as practicable after such inspection, Modifications to control measures shall be implemented in a timely manner, but in no case more than 7 calendar days alter the inspection. 3) The operator shall keep a record of inspections. Any incidence of non-compliance, such as uncontrolled releases of mud or muddy water or measurable quantities of sediment found off the site, shall be recorded with a brief explanation as to the measures taken to prevent future violations, as well as any measure taken to clean up the sediment that has left the site. After adequate measures have been taken to correct any problems, or where a report does not identify any incidents of non-compliance, the report shall contain a signed certification indicating the site is in compliance. This record shall be made available to the Division upon request. b) Completed Sites - For sites where all construction activities are completed but final stabilization has not been achieved due to a vegetative cover that has been planted but has not become established, the permittee shall make a thorough inspection of their stormwater management system at least once every month. When site conditions make this schedule impractical, permittees may petition the Division to grant an alternate inspection schedule. These inspections must he conducted in accordance with paragraphs I), 2), and 3) of Part I.C.S.a. above. c) Winter Conditions - Inspections, as described above in a) and b), will not be required at sites where snow cover exists over the entire site for an extended period, and melting conditions do not exist. This exemption is applicable only during the period where melting conditions do not exist. Regular inspections, as described above, are required at all other times. 6. Resorting No regular reporting requirements are included in this permit; however. the Division reserves the right to request that a copy of the inspection reports be submitted. 7. SWMPSibmittal i]neolleuueat Upon request, the permittee shall submit a copy of the SWMP to the Division, EPA or any local agency in charge of approving sediment and erosion plans, grading plans or stormwater management plans_ All SWMPs required under this permit are considered reports that shall be available to the public under Section 308(b) of the CWA. The owner or operator of a facility with stortnwater discharges covered by this permit shall make plats available to members of the public upon request, unless the SWMP has been submitted to the Division. However, the permittee may claim any portion of a SWMP as confidential in accordance with 40 CFR Part 2. D. ADDITIONAL DEFINITIONS For the purposes of this permit: 1. 8A1' and BCI': (Best Availabie'Fechnology and Best Conventional Technology) Technology based federal water quality requirements covered under 40 CPR subchapter N. 2. Beat management practices (HNPs): schedules of activities, prohibitions of practices, maintenance procedures, and other management practices to prevent or reduce the pollution of waters of the State. BMPs also include treatment requirements, operating procedures, and practices to control site runoff, spillage or leaks, waste disposal, or drainage from material storage. 3. Dedicated asphalt plants and concrete plants: portable asphalt plants and concrete plants that are located on or adjacent to a construction site and that provide materials only to that specific construction site. PART 1 Page 11 Permit tea. COR -030000 D. ADDITIONAL DEFINITIONS (cont.) 4. Pima] stabilization: when ail soil disturbing activities at the site have been completed, and uniform vegetative cover has been established with a density of at least 70 percent of pre -disturbance levels, or equivalent permanent, physical erosion reduction methods have been employed. For purposes of this pennit, cstablishntent ofa vegetative cover capable of providing erosion control equivalent to pre-existing conditions at the site will he considered final stabilization. 5. Municipal storm sewer system: a conveyance or system of conveyances (including: roads with drainage systems, municipal streets, catch basins, curbs, gutters, ditches, man-made channels, or storm drains), owned or operated by a State, city, town, county, district, or other public body (created by state law), having jurisdiction over disposal of sewage, industrial waste, stormwater, or other wastes; designed or used for collecting or conveying stormwater. 6. Operator: the individual who has day-to-day supervision and control of activities occurring at the construction site. This can be the owner, the developer, the general contractor or the agent of one of these parties, in some circumstances. It is anticipated that at different phases ofa construction project, different types of parties may satisfy the definition of 'operator' and that the permit may be transferred as the roles change. 7, Distfall: a point source at the point where stormwater leaves the construction site and discharges to a receiving water or a stormwater collection system. S. Part of larger common plan of development or sale: a contiguous area where multiple separate and distinct construction activities may be taking place at different times on different schedules under one plan. 9. Point source: any discernible, confined and discrete conveyance from which pollutants are or may be discharged. Point source discharges of stormwater result from structures which increase the imperviousness of the ground which acts to collect runoff, with runoff being conveyed along the resulting drainage or grading pattern. 10. Process water: any water which during manufacturing or processing, comes into contact with or results from the production of any raw material, intermediate product, finished product, by product or waste product. This definition includes mine drainage. 11. Receiving Water: any water of the State of Colorado into which slormwater related to construction activities discharges. 12. Runoff coefficient: the fraction of total rainfall that will appear as runoff. 13. Significant Materials include but are not limited to: raw materials; fuels; materials such as metallic products; hazardous substances designated under section 101(14) of CERCLA; any chemical the facility is required to report pursuant to section 313 of tide 111 of SARA; fertilizers; pesticides; and waste products such as ashes, slag and sludge that have the potential to be released with stormwater discharge. 14. Sturmwater: precipitation -induced surface runoff, l5. Waters of the state of Colorado: any and all surface waters that are contained in or flow in or through the state of Colorado. This definition includes all water courses, even if they are usually dry. E. GENERAL REQUIREMENTS 1. Sianatery Requirements a) All reports required for submittal shall he signed and certified for accuracy by the permittee in accordance with the following criteria: 1) In the case of corporations, by a principal executive officer of at least the level of vice-president or his or her duly authorized representative, if such representative is responsible for the overall operation of the facility from which the discharge described in the form originates; 2) In the case of a partnership, by a general partner; PART 1 Page 12 Permit No. COR -030000 E. GENERAL REQUIREMENTS (cont.) 3) In the case of a sole proprietorship, by the proprietor; 4) En the case of a municipal, state, or other public facility, by either a principal executive officer, ranking elected official, or other duly authorized employee. b) Changes to authorization. If an authorization under paragraph a) of this section is no longer accurate because a different individual or position has responsibility for the overall operation of the facility, a new authorization satisfying the requirements of paragraph a) of this section must be submitted to the Division, prior to or together with any reports, information, or applications to be signed by an authorized representative. e) Certification. Any person signing a document under paragraph a) of this section shaft make the following certification: '1 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. Rased 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 vinlations." 2. Retention of Records a) The permittee shall retain copies of the SWMP and all reports required by this permit and records of all data used to complete the application to be covered by this permit, for a period °fat least three years from the date that the site is finally stabilized, b) The permittee shall retain a copy of the SWMP required by this perrnit at the construction site From the date of project initiation to the date of final stabilization, unless another location, specified by the permittee, is approved by the Division. PART It A. MANAGEMENT REQUIREMENTS 1. Chime in Discharge l'he permittee shall inform the Division (Permits Unit) in writing of any intent to significantly change activities from those indicated in the permit application (this does not include changes to the SWMP). Upon request, the permittee shall furnish the Division with such plans and specifications which the Division deems reasonably necessary to evaluate the effect on the discharge and receiving stream. The SWMP shalt be updated within 30 days of the changes. The permittee shall submit this notice to the Division within two weeks after making a determination to perform the type of activity referred to in the preceding paragraph. Any discharge to the waters of the State from a point source other than specifically authorized by this permit is prohibited. 2. Svecial Notifications - Definitions a) Spill; An unintentional release of solid or liquid material which may cause pollution of state waters. b) Upset; An exception& incident in which there is unintentional acid temporary noncompliance with permit effluent limitations because of factors beyond the reasonable control of the permittee. An upset does not include noncompliance to the extent caused by operational error, improperly designed treatment facilities, inadequate treatment facilities, lack of preventative maintenance, or careless or improper operation. PART II Page 13 Permit No. COR -030000 A. MANAGEMENT REQUIREMENTS (cont.) 3. Noncvmntlance Notlticatioq a) If, for any reason, the permittee does not comply with or will be unable to comply with any permit limitations, standards or permit requirements specified in this permit, the permittee shall, at a minimum, provide the Water Quality Control Division and EPA with the following information: 1) A description of the discharge and cause of noncompliance; 2) The period of noncompliance, including exact dates and times and/or the anticipated time when the discharge will return to compliance; and 3) Steps being taken to reduce, eliminate, and prevent recurrence of the noncomplying discharge. b) The permittee shall report the following instances of noncompliance orally within twentv-Ebur (24) hours from the time the permittee becomes aware of the noncompliance, and shall mail to the Division a written report within five (5) days atter becoming aware of the noncornpliance (unless otherwise specified by the Division): 1) Any instance of noncompliance which may endanger health or the environment; 2) Any spilt or discharge of oil or other substance which may cause pollution of the waters of the state. c) The permittee shall report all other instances of non-compliance to the Division within 30 days. The reports shall contain the information listed in sub -paragraph (a) of this section. 4. Submission of Incorrect or Incomplete Information Where the permittee failed to submit any relevant facts in a permit application, or submitted incorrect information in a permit application or report to the Division, the permittee shall promptly submit the relevant application information which was not submitted or any additional information needed to correct any erroneous information previously submitted. 5. Bypass The bypass of treatment facilities is generally prohibited. 6. Upsets a) Effect of an Upset An upset constitutes an affirmative defense to an action brought for noncompliance with permit limitations and requirements if the requirements of paragraph b of this section ate met. (No determination made during administrative review of claims that noncompliance was caused by upset, and before an action for noncompliance, is fatal administrative action subject to judicial review.) b) Conditions Necessary for a Demonstration of Upset A permittee who wishes to establish the affirmative defense of upset shall demonstrate through properly signed contemporaneous operating logs, or other relevant evidence that: I) An upset occurred and that the permittee can identify the specific cause(s) of the upset; 2) The permitted facility was at the time being properly operated; 3) The permittee submitted notice of the upset as required in Part WI.A.3. of this permit (24-hour notice); and PART II Page 14 Permit No. COR -030000 A. MANAGEMENT REQUIREMENTS (cont.) 4) The permittee complied with any remedial measures required under Section 122.7(d) of the federal regulations. c) Burden of Proof In any enforcement proceeding the permittee seeking to establish the occurrence of an upset has the burden of proof, 7. Removed Suhstanceg Solids, sludges, or other pollutants removed in the course of treatment or control of wastewaters shall be properly disposed of in a. manner such as to prevent any pollutant from such materials from entering waters of the State, S, Minimization of Adverse Impact The permittee shall take all reasonable steps to minimize any adverse impact to waters of the State resulting from noncompliance with any effluent limitations specified in this permit, including such accelerated or additional monitoring as necessary to determine the nature and impact of the noncomplying discharge. 9. Reduction, Loss. or Failure of Treatment Facility The permittee has the duty to halt or reduce any activity if necessary to maintain compliance with the permit requirements. Upon reduction, loss, or failure of the treatment facility, the permittee shall, to the extent necessary to maintain compliance with its permit, control production, or all discharges, or both until the facility is restored or an alternative method of treatment is provided. It shall not be a defense for a permittee in an enforcement action that it would be necessary to halt or reduce the permitted activity in order to maintain compliance with the conditions of this permit. 10. Prover Operation an Maintenance The permittee shall at all times properly operate and maintain all facilities and systems of treatment and control (and related appurtenances) which are installed or used by the permittee to achieve compliance with the conditions of this permit. Proper operation and maintenance includes eff ctive performance, adequate funding, adequate operator staffing and training, and adequate laboratory and process controls, including appropriate quality assurance procedures. This provision requires the operation of back-up or auxiliary facilities or similar systems only when necessary to achieve compliance with the conditions of the permit. 1:3. RESPONSIBILITIES 1. lnsriecfions and Riaht to Entre The permittee shall allow the Director of the State Water Quality Control Division, the EPA Regional Administrator, and/or their authorized representative, upon the presentation of credentials; a) To enter upon the permittee's premises where a regulated facility or activity is located or in which any records are required to be kept under the terms and conditions of this permit; b) At reasonable times to have access to and copy any records required to be kept under the terms and conditions of this permit and to inspect any monitoring equipment or monitoring method required in the permit; and e) To enter upon the permittce's premises to investigate, within reason, any actual, suspected, or potential source of water pollution, or any violation of the Colorado Water Quality Control Act. The investigation rnay include, but is not limited to, the following! sampling of any discharge and/or process waters, the taking of photographs, interviewing permittee staff on alleged violations, and access to any and all facilities or areas within the permittee's premises that may have any effect on the discharge, permit, or alleged violation. 8. RESPONSIBILITIES (cont.) PART 11 Page 15 Permit No. COR -030000 2. Duty to Provide information The perm ttee shall furnish to the Division, within a reasonable time, any information which the Division may request to determine whether cause exists for modifying, revoking and reissuing, or inactivating coverage under this permit, or to determine compliance with this permit. The permittee shall also furnish to the Division, upon request, copies of records required to be kept by this permit. 3. Transfer of Ownership or Control Certification under this permit may be transferred to a new permittee if: a) The current permittee notifies the Division in writing when the transfer is desired; and b) The notice includes a written agreement between the existing and new permittees containing a specific dale for transfer of permit responsibility, coverage and liability between them; and c) The current permittee has fret all fee requirements of the State Discharge Permit System Regulations, Section 61.15. 4. Modificntlnn, Suspension, or Revocation of Permit By Division All permit modification, inactivation or revocation and reissuance actions shall be subject to the requirements of the State Discharge Permit System Regulations, Sect ions 61,5 { 2 j , 61.5 (3) , 61.7 and 61.15 , 5 C. C . R . 1002-61, except for minor modifications. a) This permit, and certification under this permit; may be modified, suspended, or revoked in whole or in part during its term for reasons determined by the Division including, but not Limited to, the following: I) Violation of any terms or conditions of the permit; 2) Obtaining a permit by misrepresentation or failing to disclose any fact which is material to tete granting or denial of a permit or to the establishment of terms or conditions of the permit; 3) Materially false or inaccurate statements or information in the application For the permit; 4) Promulgation of toxic effluent standards or prohibitions (including any schedule of compliance specified in such effluent standard or prohibition) which are established under Section 307 of the Clean Water Act, where such a toxic pollutant is present in the discharge and such standard or prohibition is more stringent than any limitation for such pollutant in this permit. b) This permit, or certification under this permit, may he modified in whole or in part due to a change in any condition that requires either a temporary or permanent reduction or elimination of the permitted discharge, such as: 1) Promulgation of Water Quality Standards applicable to waters affected by the permitted discharge; or 2) Effluent limitations or other requirements applicable pursuant to the Slate Act or federal requirements; or 3) Control regulations promulgated; or 4) Data submitted pursuant to Part 1.B or Part 1.C.1 indicates a potential for violation of adopted Water Quality Standards or stream classifications. PART 11 Page 16 Permit No. COR -030000 B. RBSPONSIB€LITIES (cont_) c) This permit, or certification under this permit, may be modified in whole or in part to include new effluent limitations and other appropriate conditions where data submitted pursuant to Part 1 indicates that such effluent Iirnitations and conditions are necessary to ensure complianwe with applicable water quality standards and protection of classified uses. d) At the request of the permittee, the Division may modify or inactivate certification under this permit if the following conditions are met: 1) In the case of inactivation, the permittee notifies the Division of its intent to inactivate the certification, and certifies that the site has been finally stabilized; 2) In the case of inactivation, the permittee has ceased any and all discharges to state waters and demonstrates to the Division there is no probability of further uncontrolled discharge(s) which may affect waters of the State. 3) The Division finds that the permittee has shown reasonable grounds consistent with the Federal and State statutes and regulations for such modification, amendment or inactivation; 4) Fee requirements of Section 61.15 of State Discharge Permit System Regulations have been niet; and 5) Requirements of public notice have been met. For small construction sites covered by a Qualifying Local Program, coverage under this permit is automatically terminated when a site has been finally stabilized, 5. Permit Violations Failure to comply with any terms and/or conditions ofthis permit shall be a violation of this permit. Dischargers of stormwater associated with industrial activity. as defined in the EPA Stormwater Regulation (40 CFR 122.26(6)(14), which do not obtain coverage under this or other Colorado general permits, or under an individual (:DPS permit regulating industrial storniwater, will be in violation of the federal Clean Water Act and the Colorado Water Quality Control Act, 25-5-141. Failure to comply with CDPS permit requirements will also constitute a violation. Civil penalties for such violations may be up to $10,000 per day, and criminal pollution of state waters is punishable by fines of up to $25,000 per day. 6, Leeal Responsibilities The issuance ofthis permit does not convey any property or water rights in either real or personal property, or stream flows, or any exclusive privileges, nor does it authorise any injury to private property or any invasion of personal rights, nor any infringement of Federal, State or local Taws or regulations. Nothing in this permit shall be construed to preclude the institution of any legal action or relieve the permittee from any responsibilities, liabilities, or penalties to which the permittee is or may be subject to under Section 311 (Oil and Hazardous Substance Liability) of the Clean Water Act. 7. 5evetabillty The provisions ofthis permit are severable. if arty provisions of this permit, or the application of any provision of this permit to any circumstance, is held invalid, the application of such provision to other circumstances and the application of the remainder of this permit shall not be affected. PART II Page 11 Permit No. COR -030000 17. RESPONSIBILITIES (cont.) 8. Renewal Application lithe permittee desires to continue to discharge, a permit renewal application shall be submitted at least ninety (90) days before this permit expires. if the permittee anticipates that there will he no discharge after the expiration date of this permit, the Division should be promptly notified so that it can inactivate the certification in accordance with Part 11.13.4.d. 9. Cnnfdentiaiity Except fin- data determined to be confidential under Section 308 of tate Federal Clean Water Act and Regulations for the State Discharge Permit System 61.5(1), all reports prepared itt accordance with the terms of this permit shall be available for public inspection at the offices of the Division. The permittee must state what is confidential at the time of submittal. Any information relating to any secret process, method of manufacture or production, or sales or marketing data which has been declared confidential by the permittee, and which may he acquired, ascertained, or discovered, whether in any sampling investigation, emergency investigation, or otherwise, shall not be publicly disclosed by any member, officer, or employee of the Commission or the Division, but shall be kept confidential. Any person seeking to invoke the protection of this section shall bear the burden of proving its applicability. This section shall never be interpreted as preventing full disclosure of effluent data, 10. Pee. The permittee is required to submit payment of an annual fee as set forth in the Water Quality Control Act. Failure to submit the required fee when due and payable is a violation of the permit and will result in enforcement action pursuant to Section 25-8-601 et. scq., C.R.S. 1973 as amended. 1 1. Requiring an Individual CDPS Permit The Director may require any owner or operator covered under this permit to apply for and obtain an individual CDPS permit if: a) The discharger is not in compliance with the conditions of this general permit; h) Conditions or standards have changed so that the discharge no longer qualifies for a general permit; or c) 1)ata become available which indicate water quality standards may be violated. The owner or operator must be notified in writing that an application fur an individual CDPS permit is required. When an individual C1)PS permit is issued to an owner or operator otherwise covered under this General Permit, the applicability of the general permit to that owner or operator is automatically inactivated upon the effective date of the individual CDPS permit APPENDIX B Typical Storm Water BMP Details TYPICAL PLAN VIEW NTS FLOW FLUME DRAINAGE CROSSING SEE NOTE 1 SEE NOTE 2 PIPELINE CONSTRUCTION ROW 1 s SEE NOTE 3 I rf I NOTES: 1. EXTEND CULVERT AT LEAST 3 FEET BEYOND TOE OF FILL, UPSTREAM AND DOWNSTREAM. 2. ROLLED PRODUCT ON FILL SLOPE. 3, ENERGY DISSIPATION BELOW CULVERT OUTLET, (IF REQUIRED). \clients\COR CiLERMI1,EN-4.A' rAVIumeR•atetol TYPICAL PROFILE NTS ORIGINAL SURFACE CU LVERT CONSTRUCTION SURFACE BOTTOM OF PIPELINE TRENCH FIGURE 2 TYPICAL FLUME LAYOUT STORM WATER MANAGEMENT PLAN ENCANA GATI1ERING SERVICES REN BION 0A/E: PEWSCN NW�ER 9/15745 OG NUM Fre: Nnjf IPPRINEA SY: CM PROJECT # EGC5672 SCALE: NONE C0RDI LLE RAN VARIOUS 2 2 12" BERM (SEE NOTE #1) CHANNEL (SEE NOTE #2) 2 2 J 1 VARIOUS NOte5: 1. Berm to be compacted by wheel rolling or track walking with suitable heavy equipment. 2. Channel to be constructed at a minimum 2% grade. 3. A 2h:1v slope Is the maximum. 3h:1v slopes are preferred. M VrKntSCORCILLERAN\Pc rotes'-Crk_hannel4WQ FIGURE TYPICAL CHANNEL AND BERM STORM WAT~R MANAGEMENT PLAN ENCANA OIL & GAS (USA) INC. ernsm+ DOE: 51d7S5 REMON w\Alt.x oop ORAN dr` 1NV 0-00,14A0 AIN: OAA PROJECT # ECO5242 SCAM: AS SHOWN COR DI LLERAN ROCK CHECK DAM STRAW BALE CHECK DAM Photos from "Erosion Control, Sediment Control and Stormwater Management on Construction Sites and Urban Areas," Alabama Soil and Water Conservation Committee. DRAINAGE CRITERIA MANUAL (V. 3) CONSTRUCTION REST MANAGEMENT PRACTICES STRAW BALE BARRIER Definition A temporary sediment farmer consisting of a row of entrenched and anchored straw bales. Purposes 1. To intercept and detain small amounts of sediment from disturbed areas of limhed extent in order to reduce sediment in runoff from lead the site. 2. To decrease the velocity of sheet flows from hulslape areas From: Virginia Soil and Water Conservation Commission, 1985 FIGURE C-12 Stow Bale Barriers Feer -6 OD zoote C-42 8-1-99 Urban Drainage and F1aod Control € rstrlct DRAINAGE CRITERIA MANUAL (V. 3) CONSTRUCTION BEST MANAGEMENT PRACTICES :12 44 -L,1441„ 112 1".11,41 I L11:6 1111:1 !fa' ;it ;11:11:11111V1111!I 3. Wedge loose straw between bales. 4. Backfill and compact the excavated soil. From: Virginia Soil and Water Conservation Commission, 1985 FIGURE C -12A Slaw Bale Barrier Installation F'o'VItFd IZ 9-1.99 Urban Drainage and Hood Control District C-43 DRAINAGE CRITERIA MANUAL (V. 3) CONSTRUCTION BEST MANAGEMENT PRACTICES CHECK DAM oeffnftlon Small temporary dam constructed across a Swale or drainage ditch. Purposes To reduce the velocity of storrnwater flows and erosion of the swale or ditch. From: Virginia Sail and Water Conservation Commission, 1985 f,ov'' FC -t,200 C-60 FIGURE C-21 Check Dam 9-1-99 Urban Drainage and Flood Control District American Excelsior Company MPP Earth Science Division Proud Part -Wpm in NJThP & Proud Member of: CCM r k L}.11ER� CURLEe EROSION CONTROL BLANKETS INSTALLATION GUIDELINES Before installing Curlex blankets, the seedbed shall be inspected by the Owner's Representative to ensure it has been properly compacted and fine graded to remove any existing rills. It shall be free of obstructions, such as tree roots, projections such as stones, and other foreign objects. The contractor shall proceed when satisfactory conditions are present. After the area has been properly shaped, seeded, fertilized, and compacted, Curiex blanket's outside tape shall be removed. Next, locate the start of the roll, making sure the roll is facing toward the area to be covered, and then roll out the blanket. The blanket shall be rolled out flat, even, and smooth without stretching the material then anchored to the subgrade, Slopes: It is recommended the blankets be installed vertically on the slope; however, on short slopes it may be more practical to install horizontally across the width of the application. If more than ane width is required, simply abut the edges together and secure the blankets with a common row of staples. Overlapping of Curlex blankets is not required. Curlex blankets shall be Trenched at the head of the slope if the blanket cannot be extended three feet over the slope crest or if overland flow is anticipated from upslope areas. Channels; Curlex blankets shall be centered to offset a seam in the middle of the waterway. They shall be installed in the same direction as the water flow. The adjoining blankets shall be installed away from the center of channel and overlapped. Curlex blanket installation should continue up the side slopes and three feel over the crest to the flat of the final grade. Flanks exposed to runoff, or sheet flow, must be protected by a check slot or trenched. Curlex blankets shall be trenched at the start of the channel and anchored using a staggered staple pattern at end of roll overlaps and end of roll terminations. Disclaimer: Curlex is a system for erosion control and revegetation on slopes and channels. American Excelsior Company (AEC) believes that the information contained herein to be reliable and accurate for use in erosion control and re -vegetation applications. However, since physio conditions vary from fob site to job site and even within a grrven job site, AEC makes no performance guarantees and assumes no obligation or liability for the reliability or accuracy of Information contained herein for the results, safely, or suitability of using Curlex, or for damages occurring in connection with the installation of any erosion control product whether ar not made by AEC or its affiliates, except as separately and specifically made in writing. These guidelines are subject to change without notice. 850 Avenue H East * Arlington, Texas 76011 Phone 1 -800 -777 -SOIL *Fax 517-385-3585 * w w.Carle r.corn WUt04R0205 bOi itz Si IPA t It 40 1 Ef ill ' Li hisa14 Pyp gt 13 iv j 1 4 r e i 4 III d 81 r i !I ii i American dab Excelsior Company eillier Earth Science Division Proud Particignnt in NT EP & Proud Member of: 4333) V ,iYplwy?e!sx hemetime Erasion Control AftXielkin 4"" a 2' Curlex®Staple Pattern Guide For 8' wide Curlex Erosion Control Blankets Adjust horizontal staple spacing for 4' wide Curlex Erosion Control Blankets Slope 5 4:1 , 5 3:1 5 2:1 a 2:1 5 1:1 Low How Channel Nigh flow Channel Staple Pattern A 8 C D D E J s' 0 A 0.7 S3aples/ytl2 2' 0 D 1' 2, 2' 2' 1' --0-0-0-0-- 2• 0 = Staple Placement —0 0 0 0 0 0 0 0 0 0 0 A D 2.9-3.2 Stapfeslyd2 1.5' 1,5' 1.5' 4' 3' 0 0 8 1A StaplOs/yd2 2' 1 1' 2' 2' 2' 1' 2' —0 0 0 0 0 0 0 [i 0 0 0 0 0 0 0 A E 3.2.4.1 Staples/02 3' 4' 2.3-2.9 Stapieslydz Note: ' For Cohesive Sol use a 8"x 1 "x8" 1 gauge wire staple and for Non -Cohesive Soil use a 8"x2"x8" 11 gauge wire staple. " Adjust staple pattern so staples are placed in critical channel points. (e.g. slope interface, channel bottom) Example of critical channel points Critical Paints are circled 85[} Avenue 11 East * ArlirsTron, Texas 7601 1 Phone I-800-777-SOTC. * Fax 817-385-3585 * wwry Qrlex.corn WO 10580305 DRAINAGE CRITERIA MANUAL (V. 3) CONSTRUCTION BEST MANAGEMENT PRACTICES SILT FENCE INSTALLATION STEEL OR 2144' WOOD POST (ANCHORED TO FABRIC) \ NOTE: EROSION CONTROL MEASURES SHALL t3E IdAINTAtNED UNTIL LANDSCAPING IS COMPLETED, OR AS DIRECTED BY LOCAL JURISDICTION FABRIC MATERIAL f (ACHORED IN TRENCH r 4-x4^ TRENCH % BACKF ILLAO SECTION -� - FLOW -NT$- DETAIL rrs DETAIL SILT FENCE EROSION BARRIER Details provided to Dtshict by the City of Broamfiekt CcloracIo Prg,.rt €Jrlawn arxa,.++co 4,g:4 /a�acd Cass 4,0 1 'D:s,r• rC-F FIGURE C-13 5, B�s„.4...+5 ,..„.. 1 Sift Fence Erosion Barrier f�olsr..-4 foie #.ee5j "fir-re+e kte.f es �� -���' CUoFefl, `ter} C-44 9-1-99 Urban Drainage and Flood Control District r\\‘, --- 3.-- 4` 2.17 S—RAW Rt d L S IM.67 kr Pl,Arj?2 - ALo:§ra SLOPE roWWTe /RS N W - -&?) seAc it.Y: CLPriwil i [?N -sea IWC .4Aro vopr r r . 411 AmiciWT POLLS WI) TIGNEEY ABY!T' / AND .+1.ATM -Sf'p ARS CAP:URCO 9& ?M 771S. !' 7e.t-$. (75— !,25,-m.,..) 3" tri" ilfl. �(g--•25Cnrn) df 1" x 1 - `: %,4KE 1. STR4W RLL INSrr¢LL4F1CW REMyRr,S T+*F rA?YL NT Am isfa T 51,41aw O /!IL .'g?L' Ili' A /R 'CH,, . —v ;45— 125mm) DEEP, L'LI& ON CrINt RUM9F-IF Nor gE ALLO D TO MAI AVER ORAs.'UNP ROL. '•-r `rte f ; ckA y (5 r 250rm) NOT 70 SCALE STRAW W 1,1,51 Page 1 of 1 http://www.strawwattles.camlerosinndraw/STRWROLL.GL 9/22/2005 TYPICAL. CULVERT PROFILE NO -100 DEEP NO - TOO MOH • YES Roadbed 2 Slope 34 cm min. �fi� 9• Seed and mulch' or protect with riprap Do not change stream bottom elevatiwil 'I•YPICAL CULVERT CUTLET 4°e q 0 el , 9F • 1 ■r 4.:•{�• o° • e • J ' minimum 15-30 etn - ma3unl 63 m deptigih 0..0 o a ■a Dw i !•2� CmundLine 67r.jala 4111* 401104111 0 a a' 04 • p s a ps. e a• i d u (3 Oir • v+ • �• � {yam �6 ." v%.,1 p dc' J ps " d� • 0. 0 From "low -Volume Roads Engineering, Rest Management Practices Field Guide," BIM and I1SFS. DRAINAGE CRITERIA MANUAL (V. 3) CONSTRUCTION BEST MANAGEMENT PRACTICES TEMPORARY SEDIMENT BASIN 58 Definitions A temporary basin with a controlled storrnwater release structure, formed by excavation or construction of an embankment of compacted soil. Required for all drainage areas greater than 1 area. Purposes To detain sediment -laden runoff from distributed areas to allow the majority of the sediment to settle out. Limiting geometry; LAW greater than 2.0 100 -Year or Larger Emergency Spillway Emergency s=not be constr11Cfed over illi material Required volume to crest of emergency spiay 1800 cubic feet per acre of drainage area. Should be cleaned out prior to becoming half full. From: Virginia Soil and Water Conservation Commission, 1985 FIGURE C-15 Fro, u 17FCt ZOCel Teporary Sediment Basin 9-1-99 Urban Drainage and Flood Control District C-47 DRAINAGE CRITERIA MANUAL (F. 3) CONSTRUCTION BEST MANAGEMENT PRACTICES REQ1. 4T CLEA3F-Elair LEVEL I PI..CRT OF LOWEST'OFIFSLF; AT j OF STORAtSE VOL U EF 8'i OR LAR©ERPIC rE3TLFflRATE0 RISEFt PIPE (P9iFORAFICA2S SIZED 1 1tJMAW VIJS dE U11.L1 EIOR WV SFALLVAV HOURS) Ir tea LARGER] PVC. FLY ELBOW 3 NA FLATFER = II'C-3`iJ•=11�� �� _ iJ�iTTEH 106 YR (CR LARGE EIYAFR MC 51.11.LWAY CRESUIEZVID [8iL1Lt 8E PROTECT®WFIN i % RESIN `%. EAISARpJEur • a ors ux avc am. Amas �xrsi FIGURE C -15A Temporary Sediment Basin Outlet Detail Fr©—% U i`bFGD z°cy CAB 9-1-99 Urban Drainage and flood Control District APPENDIX C Specifics of Administrative Operations, SWMP Supplement Form, and SWMP Inspection and Maintenance Form STORM .WATER MAI\AGEMENT PROGRAM SPECIFICS OF ADMINT A.S TRATIV E OPERATIONS This page of the stormwater management program is in place to give an overview of the way EnCana Corporation is operating its administrative operations of its stonnwater management program. Because of the di_tferences between the oil and gas industry verses a typical construction sight there are some slight differences on bow Enema Corporation maintains its SWMP. 'these changes hold true to the CDPHE General Permit Storrawater Discharge Associated with Construction Active Penmt, issued by the state of Colorado. EnCana Corporation is keeping a log book of all of its 14 day inspections in its offices separate of the SWMP. The SIAN? and the log hook of stormwater inspections go hand in hand in keeping EnCana Corporation in compliance with the state of Colorado's Storrnwater Discharge Associated with Construction Activity Permit. fn the log hook, you will find sight specifics of each individual pad location. to these specifics you will find a sight drawing which indicates the equipment on each individuallocation, and where this equipment is placed on the sight. 11 will identify all the dirt stockpiles and pits being utilized on the location. The drawing will identify the cut and fill slopes of every pad along with the direction of water flow in case of a pretipitation event. It will also give an approximate distance to the nearest water of the state and the direction in which it lays. The drawing will identify all I3MP's being used on the site along with a visual indication of the condition of the BMP's. Attached to this statement is a copy of the inspection fortis EnCana Corporation is employing in its log book. On the back of the inspection is where you will find the site map for that specific location. The site maps will be adjusted anytime there is an alteration to the pad site. These inspections will be kept in the log book until the location has reached final stabilization. After the pad has reached final stabilization, the inspection paperwork will he archived in Encana's offices in stormwater management files kept in the EFIS department. . - ,DATR-ifisT.R vrsgo:. -0619..14 STORM WATER MANAGEMENT PLAN SUPPLEMENT FORM -- U. S. ROCKIES REGION creator: CUSIodIan: Date Approved: US Rookies Et -IS US Rockies CSA 02 -July -16 SWMP Name: Encana Gathering Pipeline Site! Job Name: QTR Prepared by: QTR SEC Permit No: COR -034840 County: Garfield State: CO TNN RNG Date: 1. Attach to this form, a simple sketch of the site outlining the construction. Include any ditches, canals, creeks, streams and rivers located in the area. Determine the direction of the drainage or flow gradient for the site. Identify this flow gradient with a simple arrow pointing in the direction of the flow. Reference the gathering inspection log book for sketches and 14 day Inspections. The log book will be located in the environmental depts. office with James Sanders. All paper work will be filed in storm water folders in the office after we have established final stabilization. In till then inspections will be kept in the gathering storm water inspection log. 2. Select the type of control feature used for the site. Describe in detail the erosion controls adopted for the site based on a study of the site and the general topography of the area. Show these erosion control features on the sketch. ❑ Baled Hay ❑ Berms ❑ Ditches ❑ Silt Fence ❑ Other (specify): Describe control features: 3. Describe the maintenance schedule developed for the site. If the construction at the site is to be handled by more than one operating group, identify the operating group that will subsequently take over the site. Brief the foreman/ supervisor in charge of the second phase of the activity of SWMP supplement details. Inspections will be done within a 14 day period during construction. After right of way has been reclaimed and seed has been applied, inspections will be done within a 30 day period in till final stabilization is established. 4. At the conclusion of all construction activities, begin the reclamation of the site. Describe how reclamation of the site is to be accomplished. If the site is located in an area of agriculture cultivation, grading the site back to its original contour will be sufficient. In other areas, grading and re -vegetation may be required. When the reclamation activities are 7O% complete, enter the date the site attained 70% reclamation and sign form. FOcus'LMS PTuduclolOperaleTeseText1 SWOP SUPPLEMENT FDRM.DOC GATHER ING-WCOPE►t.lx]c Page 1 of 2 ENCANAT. -DATEIASTREVISED;:-€16l02IOr.'-. STORM WATER MANAGEMENT PLAN SUPPLEMENT FORM — U. S. ROCKIES REGION Creator: US Rockies ENS Custodian: US Rockies CSA Date Approved: 02 -July -16 When the pipeline installation phase of the project has been completed, the right-of- way will be restored as close as possible to pre -excavation grades and compaction_ Topsoil will be redistributed as dose to original salvage depths as possible. In areas with pre-existing rocky surface material, the stored rock will be spread over the right- of-way to maintain a surface appearance to that of adjacent undisturbed terrain. Seeding will be applied with a planned seed mix and application rate. Permanent waterbars will be installed on slopes at the intervals indicated in Table 1 of the Storm - water Management Plan. Every effort will be made to install permanent erosion control measures after the pipeline trench is backfilled. 14 day inspections of the site will be made to assure that isolated areas of soil erosion that may occur are corrected. After all BMP's are in place and seed is down the inspections will go to 30 inspection intervals. When the grass seed has reached a vegetative establishment level of 70%, these inspections will cease. Date site was reclaimed to 70% Mame of person ensuring reclamation Signature FoaisltMS[Produetn1OperstelDeseTexti WON SU PPW N r rORM i]OC GA1 HERtNEi.UOG OPLN. DOC ENCANA Vial A iM Page 2 of 2 EaCana SWMP [n.. peetkn and Maintenance Report Site i17. Date: Inspector- -- Si narttre: Enspectian Type: 14 day (Active) 0 Monthly (Convicted) 0 Precipitation Evcnt fl Distance to waters of the 5€ -ate (type)' FVegetation Observations Vegetation Growth uniform and at feast 7O% of pre disturbance levels: Yes ❑ No E - ; ❑ —i --I Vegetation Erosion Control equivalent to pre-exisitng conditions:Yes Yes El No 0 1 Veg_ Growth: - 0 No n. .__.....- _-- Site Revegetated` T Area Inspected: Yes i' i to % of pre -disturbance veg. Comments or Required Action _� -- - Cut SlopeY ! - Fill Slope Pad Noxious Weeds: Yes Li No 0 1 Type/Amount Best Management Practice (BMP) Check List SWMP Erosion Control: in Use Required Required Action or Comments 1 1 Terraces ' Earth Berra Wattles _1 Slope Drain Surface Material Shate Rack Mulches d r -- Native mulch/brush Rolled Product Diversion Channel _[ Check Dam _..._._..._... Sediment Control; In Use Required Silt Fence Bale Dikes Wattles Brush/Slash Y__ Sediment Bashi --.._.... _� 1 Sediment Pond Site Observations F Observation Response j ComrnentsfAction Sediment transported offsite 1 Offsite erosion Yes ri No €7 No Li i Yes i _ Spills or leaks Secondary containment or: storage tanks Yes o No u Yes o No r; Yes t) No u Pad graveled Offsite soil tracking Yes f.1 No u Access Road Observations Observation Road Graveled - Culverts ...I�l } 1 oFoct ' Response Y:::-; ri rio YC - No - • -�"r Corments/Required Action Comments: Site Drawing: APPENDIX D Gas Gathering Spill Prevention and Countermeasure Control Plan