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HomeMy WebLinkAbout03-WEP II SWMP-PermitMid-America Pipeline Company, LLC Storm Water Management Plan Western Expansion Pipeline II Rio Blanco, Garfield, Mesa Counties, Colorado Storm Water Management Plan Prepared for: Mid-America Pipeline Company, LLC PO Box 4324 Houston, Texas (713) 381-6500 September 27, 2011 Prepared by: HRL Compliance Solutions, Inc. 744 Horizon Ct. # 140 Grand Junction Co 81506 (970)-243-3271 HCSI ENVIRONMENTAL CONS''LTA NTS TABLE OF CONTENTS 1.0 INTRODUCTION 1 1.1 Storm Water Runoff Permitting Requirements 1 2.0 CONSTRUCTION DESCRIPTION 2 2.1 Pipeline Location 2 2.2 Area Characteristics 3 2.2.1 Runoff Characteristics 3 2.2.2 Existing Vegetation 11 2.3 Schedule of Construction Activities 11 3.0 POTENTIAL POLLUTION SOURCES 15 4.0 DESCRIPTION OF SOIL CONTROL MEASURES 16 4.1 Structural Practices for Erosion and Sediment Control 16 4.1.1 Straw Bale and Rock Check Dams 16 4.1.2 Straw Wattles/Straw Rolls 16 4.1.3 Water Bars 17 4.1.4 Culvert Inlet/Outlet Protection 17 4.1.5 Sediment Basins 17 4.2 Non -Structural Practices for Erosion and Sediment Control 17 4.2.1 Vegetative Buffers 17 4.2.2 Seeding of Disturbed Areas 17 4.2.3 Mulching 18 4.2.4 Erosion Control Blankets 18 5.0 PHASED BMP IMPLEMENTATION 19 5.1 Construction 19 5.2 Interim Reclamation 19 5.3 Final Stabilization 20 6.0 MATERIALS HANDLING AND SPILL PREVENTION 21 6.1 Waste Management and Disposal 21 6.2 Fuels and Materials Management 21 6.3 Construction Site Housekeeping 22 7.0 DEDICATED CONCRETE OR ASPHALT BATCH PLANTS 23 8.0 VEHICLE TRACKING CONTROL 24 9.0 INSPECTION AND MAINTENANCE PROCEDURES 25 10.0 NON-STORMWATER DISCHARGES 27 11.0 CERTIFICATIONS 28 11.1 Owner/Applicant Certification 28 11.2 Storm Water Management Plan Administrator 29 12.0 ADDITIONAL BMP REFERENCE 30 LIST OF APPENDICES Appendix A General Location Map / Site Specific Maps Appendix B Storm Water Application Form and Permit Appendix C Storm Water Inspection Form Appendix D BMP Descriptions and Installation Details Appendix E Project Seed Mixes Table 1 Site Descriptions Table 2 SWMP Revisions Table 3 Site Specific SWMP Descriptions Storm Water Management Plan (SWMP) Mid-America Pipeline Company, LLC Western Expansion Pipeline II 1.0 INTRODUCTION This Storm Water Management Plan (SWMP) has been written to comply with the Colorado Department of Public Health and Environment's (CDPHE) General Permit No. COR -030000 and associated U.S. Environmental Protection Agency (USEPA) National Pollutant Discharge Elimination System (NPDES) storm water regulations. This SWMP addresses construction activities associated with the construction of a pipeline Right of Way (ROW) and materials staging yard for construction subcontractor(s) working on the ROW. This SWMP is intended to be periodically updated as needed to address planned developments, new disturbances, and other changes required to manage storm water and protect surface water quality. This SWMP is written to contain general storm water management practices, as well as site specific information related to specific construction activities. Site specific information (i.e. Phased Best Management Practices (BMPs) implementation, potential pollution sources, final stabilization measures, etc.) found throughout the text of this document are also referenced in Table 1 (Site Descriptions) and Table 3 (Site Specific SWMP Descriptions). 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 runoff associated with construction activity for soil disturbances of five (5) acres or more be regulated as an industrial activity and covered by an NPDES permit. In December 1999, the USEPA published final Phase II 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. Storm water construction permits are required for oil and gas activities that disturb one (1) 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 include development of several well pads, access roads, pipelines, and/or other related infrastructure in a contiguous area either during the same time period or under a consistent plan for long-term development. Mid-America Pipeline Company, LLC (MAPL) will be in charge of all aspects of this project. Contractor(s) will perform the actual construction and grading. Work will be supervised by MAPL, and all decisions will be made by MAPL. 1 WEP II SWMP, 2011 Storm Water Management Plan (SWMP) Mid-America Pipeline Company, LLC Western Expansion Pipeline II 2.0 CONSTRUCTION SITE DESCRIPTION 2.1 Site Location The Western Expansion Pipeline II (WEP II) Project ROW is located in Mesa, Rio Blanco and Garfield Counties. The WEP II Project will be constructed in Utah (Uintah and Grand counties) and Colorado (Rio Blanco, Garfield, and Mesa counties) (see maps in Appendix A) and consists of a 16 -inch diameter natural gas liquids pipeline totaling 94.69 miles in length, requiring new pipeline right-of-way that will parallel existing pipelines or existing rights-of-way for the entire length. The length of the ROW in Colorado will be 45.19 miles. The legal location of the pipeline from north to south is as follows: Salt Lake Meridian T12S, R25E, Sections 2, 1, 12, 13 and 14 Sixth Central Meridian T3S, R104W, Sections 27, 34 and 35 T4S, R104W, Sections 2, 11, 12 and 13 T4S, R103W, Sections 18, 19, 30 and 31 T5S, R103W, Sections 6, 5, 8, 17, 21, 28 and 35 T6S, R104W, Sections 6, 7, 18, 13, 24, 25, 26 and 35 T7S, R104W, Sections 2, 3, 10, 11, 14, 23, 26, 27 and 34 T8S, R104W, Sections 3, 10, 15, 22, 27 and 34 T9S, R104W, Sections 3, 10, 15, 22, 21, 28, 29 and 32 T1OS, R104W, Sections 6 and 7 Salt Lake Meridian T18S, R26E, Sections 33, 32 and 31 T18S, R25E, Section 36 T19S, R25E, Sections 1, 2, 11, 10, 15, 16, 21, 28, 29, 32 and 31 T20S, R25E, Section 6 T20S, R24E, Sections 1, 12, 11, 14, 15, 22, 27, 28, 33 and 32 T21S, R24E, Sections 5, 8, 17, 18 and 19 T21S, R23E, Sections 24, 23, 26, 27, 34, 33, 32 and 31 T21S, R22E, Sections 36, 35, 34, 33, 32 and 31 T21S, R21E, Sections 36, 35, 34, 33, 32 and 31 T21S, R20E, Sections 36, 35, 34, 27, 28 and 29 Colorado Latitude: Start (North) 39.755266 Longitude: Start (North) -109.052338 Latitude: (Middle) 39.497466 Longitude: (Middle) -109.52338 Latitude: End (South) 39.204347 Longitude: End (South) -109.051912 2 WEP II SWMP, 2011 Storm Water Management Plan (SWMP) Mid-America Pipeline Company, LLC Western Expansion Pipeline II There will be no new aboveground facilities associated with the WEP II Project at this time. Existing pump stations will be upgraded as necessary. Modifications will occur within existing footprints. Existing roads will be used to access the construction right-of-way. Upgrading of some of the existing roads may be required. Appendix A (site maps) shows possible access roads to be used during construction. The town of Mack is the nearest population center located approximately 15 miles east. Receiving waters: Receiving waters will be listed from north to south; Trail Canyon, West Evacuation Creek, McAndrews Lake, Wagon Canyon, West Salt Creek, South Canyon, Prairie Canyon, McDonald Creek, and numerous unnamed intermittent drainages. The ultimate receiving water is the Colorado River, six (6) miles south. Refer to Appendix A for the Site Specific Maps and disturbed area boundaries. 2.2 Site Area Characteristics 2.2.1 Runoff Characteristics Runoff characteristics are based on site topography, soil type, and vegetative cover. Site specific soil descriptions can be found in Table 3, site specific SWMPs. Soils identified on this project are low to very severely erosive in nature, individual soil unit descriptions are described below. The structural and nonstructural BMPs as outlined in this SWMP are specifically detailed to minimize erosion and sediment transport associated with these soil types. According to the Natural Resources Conservation Service (NRCS), the soil types within the disturbed area of this Project consist of thirty four (34) general soil units. Soils found in Rio Blanco: • Havre loam (0 to 4% slopes): This deep, well drained soil is on flood plains and low stream terraces. Elevation ranges from 5,800 to 7,200 feet. Average annual precipitation is 14 to 17 inches. Average annual air temperature is 42 to 45 degrees and the average frost free period is 80 to 105 days. Permeability is moderate. Available water capacity is high. Effective rooting depth is 60 inches or more. Runoff is medium, and the erosion hazard is slight. Native vegetation is western wheatgrass, basin wildrye, stream bank wheatgrass, blue grasses, big sagebrush, with smaller amounts of rubber rabbitbrush, fourwing saltbrush and bottlebrush squirreltail. • Patent loam (0 to 3% slopes): This deep, well drained soil is on fans and terraces. Elevation ranges from 5,800 to 6,800 feet. Average annual precipitation is 14 to 17 inches. Average annual air temperature is 42 to 45 degrees and the average frost free period is 80 to 105 days. Permeability is moderate. Available water capacity is high. Effective rooting depth is 60 inches or more. Runoff is medium, and the erosion hazard is 3 WEP II SWMP, 2011 Storm Water Management Plan (SWMP) Mid-America Pipeline Company, LLC Western Expansion Pipeline II slight. Native vegetation is blue bunch wheatgrass, western wheatgrass, needle and thread, big sagebrush, sandberg bluegrass, and Douglas rabbitbrush. • Rentsac-Moyerson-Rock outcrop complex, (5 to 65% slopes): This map unit is on ridges and foothills. Elevation ranges from 5,800 to 7,200 feet. Average annual precipitation is 13 to 16 inches. Average annual air temperature is 42 to 45 degrees and the average frost free period is 75 to 105 days. The Rentsac soil is shallow and well drained. Permeability is moderately rapid. Available water capacity is very low. Effective rooting depth is 10 to 20 inches. Runoff is medium, and the erosion hazard is moderate to very high. The Moyerson soil is shallow and well drained. Permeability to the Moyerson soil is slow. Available water capacity is low. Effective rooting depth is 10 to 20 inches. Runoff is medium to rapid and the hazard of water erosion is very high. Rock outcrop consists of ridge caps, ridge points, and long vertical bluffs. Native vegetation is Pinyon -Juniper with an understory of Indian ricegrass, beardless wheatgrass, mountain mahogany, prairie junegrass, and bitterbrush. • Tlsworth loam (0 to 5% slopes): This deep, well drained soil is on valley floors and broad fans. Elevation ranges from 5,800 to 7,000 feet. Average annual precipitation is 13 to 15 inches. Average annual air temperature is 42 to 45 degrees F, and the average frost free period is 80 to 105 days. Permeability is slow. Available water capacity is moderate. Effective rooting depth is 60 inches or more. Runoff is rapid, and the erosion hazard is moderate. Native vegetation is greasewood, bid sagebrush, Nevada bluegrass, western wheatgrass, bottlebrush squirreltail, and shadscale. Smaller amounts of winterfat and rabbitbrush are also present. • Torriorthents-Rock outcrop complex (15 to 90% slopes): This unit is in extremely rough and eroded areas on mountains, hills, ridges, and canyon sides. Slopes mainly face south. Elevation ranges from 5,100 to 7,500 feet. Average annual precipitation is 8 to 18 inches. Average annual air temperature is 40 to 50 degrees and the average frost free period is 70 to 130 days. Torriorthents are very shallow to moderately deep and are well drained to somewhat excessively drained. Permeability is moderate. Available water capacity is very low. Effective rooting depth is 10 to 20 inches and runoff is rapid, erosion is very high. Rock outcrop consists of barren escarpments, ridge caps, and points of sandstone, shale, limestone, or siltstone. Native vegetation is Pinyon -Juniper with an understory of Indian ricegrass, beardless wheatgrass, prairie junegrass, low rabbitbrush, and some forbes. • Uffens loam (0 to 5% slopes): This deep, well drained soil is on fans and low terraces. Elevation ranges from 5,100 to 5,800 feet. Average annual precipitation is 7 to 10 inches. Average annual air temperature is 45 to 50 degrees and the average frost free period is 105 to 130 days. Permeability is moderately slow. Available water capacity is moderate. Effective rooting depth is 60 inches or more. Runoff is slow, and the hazard of water erosion is moderate. Native vegetation is mainly big sagebrush, greasewood, galleta, western wheatgrass, sand dropseed, and bottlebrush squirreltail. Smaller amounts of winerfat, low rabbitbrush, Indian ricegrass, fourwing saltbush, mat saltbush, and Gardner saltbush are also present in the potential plant community. 4 WEP II SWMP, 2011 Storm Water Management Plan (SWMP) Mid-America Pipeline Company, LLC Western Expansion Pipeline II • Gompers very channery silt loam (25 to 50% slopes): This shallow well drained soil is on hills. Elevation ranges from 6,500 to 7,200 feet. Average annual precipitation is 12 to 16 inches. Average annual air temperature is 42 to 45 degrees and the average frost free period is 90 to 110 days. Permeability is moderate. Available water capacity is very low. Effective rooting depth is 18 to 22 inches or more and runoff is very high, erosion is very high. Native vegetation is Utah juniper, two needle pinyon, birch leaf mountain mahogany, Indian rice grass, Mormon tea, blue bunch, wheatgrass, saline wild rye, and Mexican cliff rose. • Mikim loam, (3 to 15% slopes): This shallow, well drained soil is along drainage ways, on alluvial valley floors. Elevation ranges from 5,600 to 6,800 feet. Average annual precipitation is 8 to 12 inches. Average annual air temperature is 45 to 49 degrees and the average frost free period is 110 to 140 days. Permeability is moderately slow. Available water capacity is high. Effective rooting depth is about 60 inches or more and runoff is medium, erosion is moderate. Native vegetation is Wyoming Big Sagebrush, Indian ricegrass, Wyoming big sagebrush, bottlebrush squirrel tail, galleta, needle and thread, globe mallow, and winter fat. • Mikim silt loam, sodic (1 to 4% slopes): This deep well drained soil is on flood plains and alluvial valley floors. Elevation ranges from 5,400 to 6,600 feet. Average annual precipitation is 8 to 12 inches, average annual air temperature is 45 to 49 degrees and the average frost free period is 110 to 140 days. Permeability is moderately slow, available water capacity is moderate. Effective rooting depth is 60 inches or more. Runoff is low, erosion is slight. Native vegetation is greasewood, alkali sacaton, bottlebrush squirrel tail, shadscale saltbush, Indian rice grass, galleta, seep weed. Soils found in Douglas -Plateau Area: • Badland (10 to 65% slopes): This map unit is on rolling to very steep, nearly barren mountainsides, low hills, ridge tops, and canyon sides. Elevation ranges from 5,200 to 7,300 feet. Average annual precipitation is 8 to 18 inches, average annual air temperature is 46 to 52 degrees and the average frost free period is 110 to 150 days. The Badland is very shallow and eshibits no significant soil characteristics. Permeability is very slow, available water capacity is very low. Effective rooting depth is 0 to 10 inches. Runoff is very rapid, and the erosion hazard is very severe. Native vegetation is very sparse low desert shrubs and grasses. • Battlement loam (1 to 8% slopes): This deep, well drained soil is on flood plains, stream bottoms, and narrow valley bottoms. Elevation ranges from 5,800 to 7,200 feet. Average annual precipitation is 12 to 16 inches, average annual air temperature is 42 to 46 degrees F and the average frost free period is 80 to 105 days. Permeability is moderate, available water capacity is high. Effective rooting depth is 60 inches or more. Runoff is medium, and the erosion hazard is slight. Native vegetation is mainly basin wildrye, western wheatgrass, and basin big sagebrush. 5 WEP II SWMP, 2011 Storm Water Management Plan (SWMP) Mid-America Pipeline Company, LLC Western Expansion Pipeline II • Battlement loam, saline (1 to 8% slopes): This deep, well drained soil is on flood plains, stream terraces, and narrow valley bottoms. Elevation ranges from 5,800 to 7,200 feet. Average annual precipitation is 12 to 16 inches, average annual air temperature is 42 to 46 degrees F and the average frost free period is 80 to 105 days. Permeability is moderate, available water capacity is moderate. Effective rooting depth is 60 inches or more. Runoff is medium, and the erosion hazard is slight to severe. Native vegetation is mainly greasewood, sagebrush, grasses, and forbs. • Caballo very channery loam (40 to 80% slopes): This deep, well drained soil is on side slopes. Elevation ranges from 8,000 to 8,700 feet. Average annual precipitation is 21 to 25 inches, average annual air temperature is 36 to 40 degrees F and the average frost free period is 65 to 90 days. Permeability is moderate, available water capacity is very low. Effective rooting depth is 60 inches or more. Runoff is rapid, and the erosion hazard is very severe. Native vegetation is mainly common juniper, elk sedge, kinnikinnick, Rocky Mounatin Douglas -fir, and Saskatoon serviceberry. • Cameo fine sandy loam (1 to 6% slopes): This deep, well drained soil is on flood plains and low terraces. Elevation ranges from 5,800 to 7,000 feet. Average annual precipitation is 12 to 16 inches, average annual air temperature is 50 to 54 degrees F and the average frost free period is 100 to 125 days. Permeability is moderately rapid, available water capacity is moderate. Effective rooting depth is 60 inches or more. Runoff is slow to medium, and the erosion hazard is slight or moderate. Native vegetation is mainly alkali sacaton, basin wildrye, galleta, fourwing saltbush, and basin big sagebrush. • Cathedral -Veatch complex (25 to 85% slopes): This map unit is on mountain slopes and benches. Elevation ranges from 6,200 to 8,500 feet. Average annual precipitation is 16 to 20 inches, average annual air temperature is 42 to 44 degrees F and the average frost free period is 85 to 100 days. Cathedral soil is shallow and well drained. Permeability is moderate, available water capacity is very low. Effective rooting depth is 8 to 20 inches. Runoff is medium, and the erosion hazard is very severe. The Veatch soil is moderately deep and well drained. Permeability is moderate, available water capacity is low. Effective rooting depth is 20 to 40 inches. Runoff is medium, and the erosion hazard is very severe. Native vegetation is mainly Gambel's oak, blue grasses, mountain brome, two needle pinyon, mutton grass, blue bunch wheatgrass, and elk sedge. • Cryorthents-Rock outcrop complex, (50 to 90% slopes): This map unit is mainly on south- and southeast facing mountain sides and ridges. Elevation ranges from 7,500 to 9,500 feet. Average annual precipitation is 16 to 20 inches, average annual air temperature is 36 to 40 degrees F and the average frost free period is 65 to 90 days. Cryorthents commonly are well drained and are moderately deep or deep to hard or soft shale. Permeability is moderate, available water capacity is very low. Effective rooting depth is 20 to 40 inches. Runoff is very rapid, and the erosion hazard is very severe. Rock outcrop consists of barren escarpments, ridge caps, rocky points of shale, and small ares of sandstone. Native vegetation is mainly Rocky Mountain Douglas -fir, Gambel's oak, Saskatoon serviceberry, grasses, sedges, and forbs. 6 WEP II SWMP, 2011 Storm Water Management Plan (SWMP) Mid-America Pipeline Company, LLC Western Expansion Pipeline II • Hesperus-Empedrado, moist -Pagoda complex, (5 to 35% slopes): This map unit is on mountainsides and benches. Elevation ranges from 6,200 to 8,500 feet. Average annual precipitation is 18 to 20 inches, average annual air temperature is 42 to 44 degrees F and the average frost free period is 85 to 100 days. The Hesperus soil is deep and well drained. Permeability is moderately slow, available water capacity is high. Effective rooting depth is 60 inches or more. Runoff is medium or rapid, and the erosion hazard is moderate to very severe. The Empedrado soil is deep and well drained. Permeability is moderate, available water capacity is moderate. Effective rooting depth is 60 inches or more. Runoff is rapid, and the erosion hazard is very severe. The pagoda soil is deep and well drained. Permeability is slow, and available water capacity is moderate. The effective rooting depth is 60 inches or more. Runoff is medium or rapid and the hazard of water erosion is severe or very severe. Native vegetation is mainly mountain brome, nodding brome, elk sedge, Saskatoon service berry, big bluegrass, and Gambel's oak. • Mesa -Avalon complex, (3 to 12% slopes): This map unit is mainly on fans and benches. Elevation ranges from 4,800 to 5,600 feet. Average annual precipitation is 7 to 11 inches, average annual air temperature is 50 to 53 degrees F and the average frost free period is 120 to 130 days. The Mesa soil is deep and well drained. Permeability is slow, available water capacity is moderate. Effective rooting depth is 60 inches or more. Runoff is medium, and the erosion hazard is moderate to very severe. The Avalon soil is deep and well drained. Permeability is moderate, available water capacity is moderate. Effective rooting depth is 60 inches or more. Runoff is medium, and the erosion hazard is moderate to very severe. Native vegetation is mainly galleta, Indian ricegrass, Wyoming big sagebrush, and shadscale saltbush. • Rock outcrop- Torriorthents complex (15-90% slope) This map unit is in extremely rough and eroded areas on mountains, hills, ridges, and canyon sides. Elevation ranges from 5,100 to 8,500 feet. Average annual precipitation is 8 to 18 inches. Average annual air temperature is 40 to 50 degrees; average frost free period is 70 to 130 days. Rock outcrop consists of barren escarpments, ridge caps, and points of sandstone, shale, limestone, or siltstone. Torriorthents are well drained and very shallow and shallow over hard bedrock. Permeability is moderate. Available water capacity is very low. Effective rooting depth is 4 to 60. Runoff is very rapid and erosion hazard is very severe. Native vegetation is shadscale saltbush, Salina wildrye, Indian rice grass, and blue bunch wheatgrass. • Torriorthents, cool -Rock outcrop complex (35-90% slope) This map unit is on extremely rough and eroded areas on mainly south -facing slopes of mountains, hills, ridges, and canyon sides. Elevation ranges from 6,200 to 8,500 feet. Average annual precipitation is 16 to 20 inches. Average annual air temperature is 42 to 44 degrees; average frost free period is 85 to 100 days. Torriorthents are well drained and very shallow and shallow over hard bedrock. Permeability is moderate or moderately rapid. Available water capacity is very low. Effective rooting depth is 4 to 60 inches. Runoff is very rapid and erosion hazard is very severe. Rock outcrop consists of barren escarpments, ridge caps, and points of sandstone, shale, limestone, or siltstone. Native vegetation is Salina wildrye, western wheatgrass, forbs, Wyoming big sagebrush, shadscale saltbush, Saskatoon serviceberry, Indian rice grass, Mormon tea, fourwing WEP II SWMP, 2011 Storm Water Management Plan (SWMP) Mid-America Pipeline Company, LLC Western Expansion Pipeline II saltbrush, and small low rabbitbrush and an overstory of Utah juniper and two needle pinyon. • Torriorthents, warm -Rock outcrop complex (35-90% slope) This map unit is on extremely rough and eroded areas on mainly south -facing slopes of mountains, hills, ridges, and canyon sides. Elevation ranges from 5,100 to 6,200 feet. Average annual precipitation is 9 to 16 inches. Average annual air temperature is 48 to 52 degrees; average frost free period is 95 to 130 days. Torriorthents are well drained to excessively drained. This soil is very shallow to deep over hard or soft bedrock. Permeability is moderate or moderately rapid. Available water capacity is very low to moderate. Effective rooting depth is 4 to 60 inches. Runoff is very rapid and erosion hazard is very severe. Rock outcrop consists of barren escarpments, ridge caps, and points of sandstone, shale, limestone, or siltstone. Native vegetation is Salina wildrye, Indian rice grass, blue bunch wheatgrass, forbs, shadscale saltbush, Wyoming big sagebrush, small low rabbitbrush, plains prickly pear, and prairie Junegrass and a thin overstory of Utah juniper. • Trail loamy sand (1-5% slope) This deep, somewhat excessively drained soil is on flood plains and low terraces. Elevation is 4,800 to 5,800 feet. The average annual precipitation is 7 to 10 inches, the average annual air temperature is 49 to 52 degrees F, and the average frost free period is 115 to 130 days. Permeability is rapid. The available water capacity is low. The effective rooting depth is 60 inches or more. Runoff is slow and the hazard of water erosion is slight. Native vegetation is mainly alkali sacaton, inland salt grass, western wheatgrass, and greasewood. Soils found in Mesa County: • Badlands-Deaver-Chipeta complex (25-99% slope) This well drained map unit is on mountainsides, rolling hills, ridges, and toe slopes. Elevation is 5,200 to 7,300 feet. The average annual precipitation is 7 to 10 inches, the average annual air temperature is 47 to 50 degrees F, and the average frost free period is 120 to 150 days. Permeability of the Badland is very slow. The available water capacity is very low. The effective rooting depth is 0 to 10 inches. Runoff is very rapid and the hazard of water erosion is very high. Permeability of the Deaver is slow. The available water capacity is low. The effective rooting depth is 0 to 10 inches. Runoff is very rapid and the hazard of water erosion is severe. Permeability of the Chipeta is slow. The available water capacity is low. The effective rooting depth is 10 to 20 inches. Runoff is rapid and the hazard of water erosion is high. Native vegetation is mainly fourwing saltbush, galleta, shadscale saltbush, Indian ricegrass, mat saltbush, bottlebrush squirreltail, and winterfat. • Gladel-Bond-Rock outcrop complex (3-25% slope) This deep, well drained soil is on ridges and mesas. Elevation is 6,800 to 7,400 feet. The average annual precipitation is 13 to 15 inches, the average annual air temperature is 45 8 WEP II SWMP, 2011 Storm Water Management Plan (SWMP) Mid-America Pipeline Company, LLC Western Expansion Pipeline II to 47 degrees F, and the average frost free period is 100 to 120 days. Permeability of the Gladel is moderately rapid. The available water capacity is very low. The effective rooting depth is 5 to 15 inches. Runoff is very high and the hazard of water erosion is very high. Permeability of the Bond is moderately slow. The available water capacity is very low. The effective rooting depth is 6 to 20 inches. Runoff is very high and the hazard of water erosion is severe. Rock outcrop consists of barren escarpments, ridge caps, and points of sandstone, shale, limestone, or siltstone. Native vegetation is mainly Utah juniper, two needle pinyon, galleta, Indian ricegrass, Wyoming big sagebrush, blue grama, true mountain mahogany, and antelope bitterbrush. • Killpack-Badlands-Persayo complex (3-25% slope) This well drained map unit is on mountainsides, low hills, and ridge tops. Elevation is 5,100 to 5,800 feet. The average annual precipitation is 6 to 10 inches, the average annual air temperature is 50 to 54 degrees F, and the average frost free period is 150 to 190 days. Permeability of the Killpack soil is slow. The available water capacity is moderately low. The effective rooting depth is 20 to 40 inches. Runoff is rapid and the hazard of water erosion is high. Permeability of the Badland is very slow. The available water capacity is very low. The effective rooting depth is 0 to 10 inches. Runoff is very rapid and the hazard of water erosion is very high. Permeability of the Persayo is moderately slow. The available water capacity is very low. The effective rooting depth is 7 to 20 inches. Runoff is rapid and the hazard of water erosion is moderate to very severe. Native vegetation is mainly galleta, shadscale saltbush, Gardner's saltbush, and mat saltbush. • Leebench, warm -Avalon complex (3-12% slope) This very deep, well drained map unit is on alluvial fans, fan remnants, strath terraces, fan terraces and hills. Elevation is 4,800 to 5,600 feet. The average annual precipitation is 6 to 10 inches, the average annual air temperature is 50 to 54 degrees F, and the average frost free period is 150 to 180 days. Permeability of the Leebench is slow. The available water capacity is moderate. The effective rooting depth is 60 inches or more. Runoff is medium and the hazard of water erosion is slight to moderate. Permeability of the Avalon is moderately slow to moderate. The available water capacity is moderate. The effective rooting depth is 60 inches or more. Runoff is medium and the hazard of water erosion is moderate to very severe. Native vegetation is mainly galleta, shadscale saltbush, Gardner's saltbush, bottlebrush squirreltail, needle and thread, fourwing saltbush, and Indian ricegrass. • Mack -Avalon complex (3-12% slope) This very deep, well drained map unit is on fan remnants, terraces, alluvial fans, dissected fans, and mesas. Elevation is 4,800 to 5,600 feet. The average annual precipitation is 6 to 10 inches, the average annual air temperature is 50 to 54 degrees F, and the average frost free period is 150 to 180 days. Permeability of the Mack soil is moderately slow. The available water capacity is moderate. The effective rooting depth is 60 inches or more. Runoff is medium and the hazard of water erosion is slight to moderate. Permeability of the Avalon is moderately slow to moderate. The available water capacity is moderate. The effective rooting depth is 60 inches or more. Runoff is medium and the hazard of water erosion is moderate to very severe. Native vegetation is mainly galleta, shadscale 9 WEP II SWMP, 2011 Storm Water Management Plan (SWMP) Mid-America Pipeline Company, LLC Western Expansion Pipeline II saltbush, bottlebrush squirrel tail, needle and thread, Indian rice grass, green rabbit brush, and sand drop seed. • Sagers-Skumpah complex (0-3% slope) This very deep, well drained map unit is on basin and valley floor remnants, alluvial fans, stream terraces lake plains, and fan skirts. Elevation is 4,200 to 6,500 feet. The average annual precipitation is 5 to 8 inches, the average annual air temperature is 50 to 54 degrees F, and the average frost free period is 150 to 190 days. Permeability is moderately slow. The available water capacity is moderate. The effective rooting depth is 60 inches or more. Runoff is low and the hazard of water erosion is slight. Runoff is low and the hazard of water erosion is slight. Native vegetation is mainly basin wildrye, western wheatgrass, greasewood, fourwing saltbush, alkali sacaton, and inland saltgrass. • Turley-Sagrlite-Fruitland complex (0-3% slope) This very deep, well drained map unit is on valley floors, summits of mesas, terraces, fan remnants, and alluvial fans. Elevation is 4,500 to 6,400 feet. The average annual precipitation is 7 to 10 inches, the average annual air temperature is 50 to 54 degrees F, and the average frost free period is 150 to 190 days. Permeability is moderately slow. The available water capacity is moderate. The effective rooting depth is 60 inches or more. Runoff is medium and the hazard of water erosion is slight. Runoff is low and the hazard of water erosion is slight. Native vegetation is mainly western wheatgrass, greasewood, fourwing saltbush, alkali sacaton, basin wildrye, and inland saltgrass. • Moffat-Kompace complex (6-35% slope) This very deep, well drained map unit is found on plains, plains on structural benches, and alluvial fans. Elevation is 3,500 to 5,900 feet. The average annual precipitation is 6 to 9 inches, the average annual air temperature is 50 to 54 degrees F, and the average frost free period is 150 to 180 days. Permeability is moderately rapid. The available water capacity is moderate. The effective rooting depth is 60 inches or more. Runoff is slow to rapid and the hazard of water erosion is moderate to very severe. Native vegetation is mainly galleta, needle and thread, Indian ricegrass, shadscale saltbush, bottlebrush squirreltail, green rabbitbrush, and sand dropseed. • Persayo-Blackston complex (6-45% slope) This map unit is found on hills, terraces, ridges, alluvium, and slope alluvium. Elevation is 5,000 to 6,800 feet. The average annual precipitation is 6 to 10 inches, the average annual air temperature is 50 to 54 degrees F, and the average frost free period is 150 to 190 days. The Persayo soil is shallow and well drained. Permeability of the Persayo is moderately slow. The available water capacity is very low. The effective rooting depth is 7 to 20 inches. Runoff is rapid and the hazard of water erosion is moderate to very severe. The Blackston soil is very deep and well drained. Permeability of the Blackston is moderate. The available water capacity is moderate. The effective rooting depth is greater than 60 inches. Runoff is high and the hazard of water erosion is severe. Native vegetation is mainly galleta, Indian ricegrass, shadscale saltbush, bottlebrush squirreltail, Gardner's saltbush, and saline wildrye. • Neiberger-Pariette complex (3-20% slope) 10 WEP II SWMP, 2011 Storm Water Management Plan (SWMP) Mid-America Pipeline Company, LLC Western Expansion Pipeline II This map unit is found on fan remnants, strath terraces, summits, shoulders, side slopes, and foot slopes of hills. Elevation is 4,500 to 5,000 feet. The average annual precipitation is 7 to 10 inches, the average annual air temperature is 50 to 54 degrees F, and the average frost free period is 150 to 180 days. The Neiberger series consists of moderately deep, well drained soils. Permeability of the Neiberger is moderate slow and slow. The available water capacity is moderate. The effective rooting depth is 24 inches. Runoff is medium to rapid and the hazard of water erosion is severe. The Pariette series consists of moderately deep over shale, well drained soils. Permeability is moderate. The available water capacity is moderate. The effective rooting depth is 20 inches. Runoff is low to medium and the hazard of water erosion is moderate. Native vegetation is mainly galleta, shadscale saltbush, Gardner's saltbush, bottlebrush squirreltail, needle and thread, fourwing saltbush, and Indian ricegrass. • Killpack-Persayo complex (3-25% slope) This map unit is on upland hills. Elevation is 5,100 to 5,800 feet. The average annual precipitation is 6 to 10 inches, the average annual air temperature is 50 to 54 degrees F, and the average frost free period is 150 to 190 days. The Killpack is a moderately deep, well drained soil. Permeability of the Killpack soil is slow. The available water capacity is moderately low. The effective rooting depth is 20 to 40 inches. Runoff is rapid and the hazard of water erosion is high. The Persayo is a shallow well drained soil. Permeability of the Persayo is moderately slow. The available water capacity is very low. The effective rooting depth is 7 to 20 inches. Runoff is rapid and the hazard of water erosion is moderate to very severe. Native vegetation is mainly saline wildrye, galleta, shadscale saltbush, Indian rice grass, Gardner's saltbush, and bottlebrush squirreltail. 2.2.2 Existing Vegetation Native vegetation in the project area consists of stands of Gambel oak, Pinyon -Juniper woodlands and fields of saline wildrye, galleta, shadscale saltbush, Indian rice grass, Gardner's saltbush, western wheatgrass, greasewood, Wyoming big sagebrush, and bottlebrush squirreltail. For site specific vegetation, refer to Table 1 (Site Descriptions) and Table 3 (Site Specific Descriptions). 2.3 Schedule of Construction Activities Activities associated with construction of the Project that may affect storm water include: clearing and grading, access road modifications, vehicle operation, maintenance and fueling, coating pipe joints, and possible herbicide application to control noxious weeds. The location for the proposed site is on public and private parcels. Clearing and Grading The construction site will be cleared and grubbed, as applicable. Topsoil and/or other materials will be salvaged and stockpiled as necessary. All stock piles will have storm water BMPs implemented to reduce sediment transport and erosion of topsoil. Sediment basins, rock check dams and diversion ditches will be implemented where applicable. Check dams may be used in ditches to dissipate water flow velocity. The ROW will be constructed utilizing standard cut -and - 11 WEP II SWMP, 2011 Storm Water Management Plan (SWMP) Mid-America Pipeline Company, LLC Western Expansion Pipeline II fill methods. Seeding and soil stabilizing will occur as construction of the site is completed. Vegetative material will be used as a BMP when applicable. Trenching Trenching activities will be conducted using track mounted excavators. Soils will be stockpiled via windrow on the upgradient side of trench were applicable. Temporary BMPs will be implemented to prevent sediment transport from stockpiles where applicable. Backfilling Pipeline Bulldozers or appropriate equipment will backfill the trench. Soils will be placed in the trench in reverse order of removal. Last soil to be excavated will be first to be backfilled, leaving the topsoil as the last stockpile to be spread evenly across the ROW. Any excavated materials not used for backfill will be disposed of properly. Reclamation Reclamation will occur after the pipeline is installed and backfill activities are completed. Temporary BMPs no longer necessary will be removed and ppermanent BMPs will be installed. Seeding will occur in accordance with landowner/ BLM requirements. Site specific reclamation details are provided in the reclamation plan. 12 WEP II SWMP, 2011 Storm Water Management Plan (SWMP) Mid-America Pipeline Company, LLC Western Expansion Pipeline II 3.0 POTENTIAL POLLUTION SOURCES Potential pollution sources associated with construction of the pipeline ROW 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 or equipment failure; • Trash and debris from clearing activities, construction materials, and workers; • Sanitary sewage associated with portable toilets; • Concrete washout activities (if applicable). The most common source of pollution from construction is sediment, which can be carried away from the work site with storm water runoff, and ultimately impact the water quality of a receiving water. 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, motor oil, brake fluid, and grease. Debris from the lay -down area, 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. For site specific potential pollution sources, refer to Table 1 (Site Descriptions). For locations of potential pollution sources, refer to Appendix A (Site Map). Concrete washout activities locations when applicable, can be found in Appendix A (Site Map). All BMPs implemented throughout the project are intended to mitigate for the release of sediment and all other potential pollution sources described above, and listed in Table 1. Refer to Appendix A for site specific locations of potential pollution sources and locations of BMPs implemented to mitigate for the potential release of the respective potential pollutants. MAPL spill prevention and response policies must be followed and include the following: • Notification procedures to be used in the event of a material release or accident. At a minimum, the field supervisor should be notified. Depending on the nature of the spill and the material involved, MAPL staff, the CDPHE, downstream water users, or other agencies may also need to be notified. The Colorado Water Quality Control Division (WQCD) toll-free 24-hour environmental emergency spill reporting line is (877)-518- 5608. • Provisions for absorbents are to be made available for use in fuel areas. 13 WEP II SWMP, 2011 Storm Water Management Plan (SWMP) Mid-America Pipeline Company, LLC Western Expansion Pipeline II 4.0 DESCRIPTION OF SOIL CONTROL MEASURES The objective of erosion sediment controls is to minimize the release of sediments and any other potential pollutants by 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 during the ROW construction to minimize possible pollutant impacts to storm water runoff. Refer to Appendix D for implementation details of soil control measures. Refer to Appendix A for locations of soil control measures. 4.1 Structural Practices for Erosion and Sediment Control Structural practices implemented to provide erosion and sediment control can include temporary and permanent BMPs. Temporary structural BMPs include, but are not limited to, straw bale barriers/check dams, temporary water bars and straw fiber rolls/wattles. When applicable, temporary BMPs will be implemented during construction and interim reclamation phases. All temporary BMPs will be removed and disposed of upon final stabilization. Permanent structural BMPs include, but are not limited to; earthen berms, drainage dips, bar ditches, diversion ditches, sediment basins, culvert inlet/outlet protection, and rock check dams. 4.1.1 Straw Bale and Rock Check Dams Straw bale and rock check dams will be installed in areas of concentrated flow. The purpose of a check dam is to reduce the velocity of water enough to allow sediment to settle, while allowing the clean water to continue migrating. Some sediment will accumulate behind the check dam. Sediment should be removed from behind the check dams when it has accumulated to one-half of the original height of the dam and properly disposed of. Check dams will be inspected for erosion along the edges of the check dams and repaired as required immediately. For temporary ditches and swales, check dams should be removed and the ditch filled in when it is no longer necessary. 4.1.2 Straw Wattles/Straw Rolls Straw rolls/wattles are intended to capture and keep sediment on a disturbed slope. Straw rolls are useful to temporarily stabilize slopes by reducing soil creep and sheet and rill erosion until permanent vegetation can be established. Straw rolls will last an average of one to two years. The slope needs to be prepared before the rolls are placed. Small trenches are created across the slope on the horizontal contour. The trench should be deep enough to accommodate half the thickness of the roll. The rolls need to be installed perpendicular to water movement, parallel to the slope contour. 4.1.3 Water Bars Water bars can be a temporary or permanent structural BMP installed to direct runoff or run-on storm water away from construction activity. Water bars slow velocity of water, and direct water 14 WEP II SWMP, 2011 Storm Water Management Plan (SWMP) Mid-America Pipeline Company, LLC Western Expansion Pipeline II into catch basins, or other BMP structures designed to capture sediment while allowing water to move through. 4.1.4 Culvert Inlet/Outlet Protection Inlets and outlets of culverts will be protected to prevent sediment build up within the culvert, thus maintaining culvert functionality. Temporary protection, during construction, can be implemented by installing straw bales or straw wattles around the inlet/outlet. For permanent protection, inlets/outlets shall be protected via rock armoring. Sediment accumulated at the inlet/outlet shall be removed as needed to ensure that there will be no blockage of the culvert. 4.1.5 Sediment Basins Sediment basins are structural BMPs installed to trap sediment that has been transported from other BMPs including, but not limited to, berms, perimeter diversion ditches, bar ditches, and drainage dips. Size and shape of each sediment basin shall depend on the specific location and surrounding topography of each site. 4.2 Non -Structural Practices for Erosion and Sediment Control Non-structural practices implemented for erosion and sediment control will consist of permanent BMPs that will be utilized during all project phases from construction to interim reclamation, and ultimately to final stabilization. Non-structural controls typically include, but are not limited to: vegetative buffers, mulching, seeding of disturbed areas, erosion control blankets, and surface roughening. 4.2.1 Vegetative Buffers Vegetative buffers are areas of existing vegetation stands that are utilized as a permanent BMP. Vegetative buffers are located on any or all edges of a project boundary. They provide a filtering effect by minimizing velocity of storm water runoff enough to allow sediment to settle out, while allowing clean water to continue following the natural drainage route. 4.2.2 Seeding of Disturbed Areas Seeding of disturbed areas will be implemented as a measure taken to achieve final stabilization. Upon construction completion, all disturbed areas to undergo reclamation shall be seeded. As a disturbed area is seeded, it will remain in the interim reclamation phase until the site has reached a vegetative cover area of 70% of pre -disturbance conditions. At this point, the site will be at the final stabilization phase. The main objective of drill seeding is to place the seed in the soil at the depth most favorable for seed germination. This method guarantees seed placement at a predetermined depth and allows for good seed to soil contact. Topography will determine if seed will be applied via a drill seeder or if there is a need for broadcasting. Hand broadcasting is commonly used in areas too small for large equipment or if the terrain is too steep for equipment to work safely. Broadcast seeding throws the seeds randomly on the soil surface. This allows for a more mosaic plant population, but must be applied at twice the drill seed rate for successful germination. Once seed has been broadcast, raking or chaining the area will ensure seed to soil contact. Refer to Appendix E for the Project seed mixes and associated application rates. 15 WEP II SWMP, 2011 Storm Water Management Plan (SWMP) Mid-America Pipeline Company, LLC Western Expansion Pipeline II 4.2.3 Mulching Mulching is a non-structural BMP implemented to aid in seed establishment. After a disturbed area has been seeded, certified weed free straw mulch will be applied at three thousand (3,000) pounds per acre. Where accessible, the mulch will be crimped into the ground to provide additional soil stabilization. 4.2.4 Erosion Control Blankets Erosion control blankets are permanent, non-structural BMPs installed on steep slopes to provide soil stabilization and to keep seed in place. Erosion control blankets are a geotextile biodegradable material that is implemented during the interim reclamation phase. 16 WEP II SWMP, 2011 Storm Water Management Plan (SWMP) Mid-America Pipeline Company, LLC Western Expansion Pipeline II 5.0 PHASED BMP IMPLEMENTATION The project will consist of a construction phase, an interim reclamation phase, and a final stabilization phase. The following sections outline specifications of each phase. 5.1 Construction The construction phase of the project will consist of ROW clearing for pipeline construction, clearing, and backfilling/general grading. Appropriate BMPs will be installed for this phase of the construction. The following outlines the necessary steps of the construction phase: • Vegetation Clearing: Vegetation will be removed and placed in a windrow on the down - gradient edge of the disturbed area when possible. • Topsoil Stripping: Topsoil will be removed and stockpiled in a windrow on the down - gradient edge of the disturbed area when possible. • 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 will be excavated, with the soil being stockpiled via windrow at the up -gradient edge of the trench • Pipe welding and placement: The pipe pieces will be laid beside the trench and welded. Long segments of welded pipe are placed within the trench by sideboom dozers. • Pipe bedding: Trench spoils will be 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. • Trench backfill: Bulldozers will move soil from the trench spoils windrow to backfill the trench. • General grading: If general grading was conducted to facilitate pipeline construction, these materials will be replaced and graded to recreate the pre -construction topography. Construction Start Date: Construction Completion Date: 5.2 Interim Reclamation Interim reclamation will be the phase of the project between construction and final stabilization. A project will enter into interim reclamation when construction is completed, disturbed areas have been seeded, and permanent BMPs have been installed. Temporary BMPs that were implemented during the construction phase may continue to be maintained during interim reclamation. Projects will remain in interim reclamation until disturbed areas have been reclaimed to 70% of pre -disturbance vegetation or otherwise permanently stabilized (i.e. graveled). The following steps will be taken to reach interim reclamation: • Topsoil placement: Topsoil will be moved and redistributed across the surface of the disturbed ROW. 17 WEP II SWMP, 2011 Storm Water Management Plan (SWMP) Mid-America Pipeline Company, LLC Western Expansion Pipeline II • Vegetative material replacement/removal: Based upon landowner requirements, stripped vegetation may be hauled off-site or redistributed along the disturbed ROW. • Seeding: The disturbed ROW will be seeded post construction. The seed mix will vary depending on location and surface ownership and will generally match the surrounding vegetation. Topography will determine if seed will be applied via a drill seeder or if there is a need for broadcasting. Refer to Appendix E for seed mixes and their respective application rate(s). • Mulching: All disturbed areas to be reclaimed will be mulched post seeding. A certified weed free straw will be crimped into the ROW to keep an adequate moisture level in the seedbed. Interim: 5.3 Final Stabilization Areas which have been disturbed are considered to be stabilized when a uniform vegetative cover with a density of 70 percent of the pre -disturbance levels has been established, or when an equivalent permanent, physical erosion reduction method is in place. Disturbed areas will remain in interim reclamation status until final stabilization is achieved. Storm water compliance inspections will be performed at required intervals until final stabilization is reached. Any temporary BMPs will be removed and disposed of. When final stabilization is achieved and all temporary control measures have been removed, MAPL will apply for an Inactivation Notice to terminate the Western Expansion Pipeline II Storm Water Permit and Storm Water Management Plan. Final Stabilization: 18 WEP II SWMP, 2011 Storm Water Management Plan (SWMP) Mid-America Pipeline Company, LLC Western Expansion Pipeline II 6.0 MATERIALS HANDLING AND SPILL PREVENTION 6.1 Waste Management and Disposal The construction activities mentioned in this SWMP will generate various other waste materials during the course of construction. These wastes typically include, but are not limited to, the following: • Trash and debris from construction materials and workers; and, • Sanitary sewage from temporary sanitary waste facilities. Each of these wastes will be managed so as to not contribute to storm water pollution. Construction trash and debris will be collected in appropriate containers and hauled off-site for disposal in suitable landfills. Sanitary waste will be contained in portable toilets or other storage tanks with waste materials regularly pumped and transported off-site for proper disposal at approved facilities. Portable toilets will be on trailers or properly secured to the ground. 6.2 Fuels and Materials Management Petroleum Products Petroleum products which may be present at the construction site 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, hydraulic, and miscellaneous oils and solvents will be stored in containers up to 55 -gallons in volume. All storage containers must be compatible with proposed contents. Storage containers will be labeled with contents. Pollutants from petroleum products used during construction activities adhere easily to soil particles and other surfaces. In the event 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 site. Oily wastes such as crankcase oil, cans, rags, and paper containing oils will be placed in proper receptacles and disposed of or recycled. Additional sources of petroleum contamination are leaks from equipment and vehicles. Routine daily inspections will be conducted to identify leaks and initiate corrective actions as necessary. The following guidelines for storing petroleum products will be applied: • All product containers will be clearly and properly labeled; • Drums will be kept off the ground within secondary containment and stored under cover when necessary; • Fuel tanks will be stored within areas containing 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 cleanup and containment materials (absorbent, shovels, etc.) will be readily available. Spills will be immediately cleaned up and contaminated materials will be 19 WEP II SWMP, 2011 Storm Water Management Plan (SWMP) Mid-America Pipeline Company, LLC Western Expansion Pipeline II properly stored on site until they can be disposed of in accordance with applicable regulations; • Storage areas and containers will be regularly monitored for leaks and repaired or replaced as necessary. Construction personnel should be informed about proper storage and handling of materials during weekly subcontractor or safety meetings. Other Chemical Product Management Various additional materials will be used and stored on site for use in construction. 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 construction contractor will maintain a staging area for equipment and materials storage on site. These areas will be maintained with good housekeeping and will be inspected on a regular basis for spills, leaks, and potential contamination. 6.3 Construction Site Housekeeping 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 appropriate off-site facilities. In the event that a spill occurs, prompt cleanup is required to minimize any commingling of waste materials with storm water runoff. Routine maintenance will be limited to fueling and lubrication of equipment. Drip pans will be used during routine fueling and 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 off site when major overhauls are necessary. Cleanup of trash and discarded materials will be conducted at the end of each work day. Cleanup will consist of patrolling the road way, access areas, and other work areas to pick up trash, scrap debris, other discarded materials, along with any contaminated soil. Upon collection, these waste materials will be disposed of properly. 20 WEP II SWMP, 2011 Storm Water Management Plan (SWMP) Mid-America Pipeline Company, LLC Western Expansion Pipeline II 7.0 DEDICATED CONCRETE OR ASPHALT BATCH PLANTS Concrete or asphalt batch plants are not applicable to the Project at this time. 21 WEP II SWMP, 2011 Storm Water Management Plan (SWMP) Mid-America Pipeline Company, LLC Western Expansion Pipeline II 8.0 VEHICLE TRACKING CONTROL Vehicle track pads will be installed at all locations where pipeline access roads access county roads directly. Track pads will be approximately 40 feet wide and 100 feet long. This will eliminate sediment transport onto public roadways. 22 WEP II SWMP, 2011 Storm Water Management Plan (SWMP) Mid-America Pipeline Company, LLC Western Expansion Pipeline II 9.0 INSPECTION AND MAINTENANCE PROCEDURES To meet the requirements of the Permit, inspection and maintenance of erosion and sediment controls must occur during the project. Continued inspection and maintenance is required for specific structures after construction is completed. The inspection program will include the following: 1. A certified person familiar with the SWMP and control measures will conduct the inspections. 2. Inspections will cover the following items within the construction site: • Disturbed areas without stabilization; • All structural and non-structural BMPs (temporary and permanent); • Material storage areas; • Surface water diversions; • Down gradient areas; and, • New access roads; • Site vehicle entrance/exit locations. 3. Inspections will occur at least once every 14 calendar days (during construction) and after a significant precipitation event, or snow melt event that causes potential for erosion. Once all measures have been taken to reach interim reclamation, inspections shall occur at least once every 30 calendar days. 4. A log of inspections will be maintained. 5. Water quality will be visually assessed for all receiving streams and discharge areas during each inspection. 6. Disturbed areas and material storage areas that are exposed to precipitation will be inspected for evidence of pollutants entering nearby drainages. 7. Roads used for vehicle access will be inspected for evidence of off-site sediment transport. 8. Following each inspection, the SWMP will be modified as necessary to include additional controls designed to correct identified problems. Necessary revisions to the SWMP will be made within 7 days of the inspection. 9. An inspection report summarizing the scope of the inspection, the name of the person conducting the inspection, the date of the inspection, and observations relating to proper implementation will be prepared. Inspection reports will be retained for at least 3 years from the date that the site is finally stabilized. 10. Actions taken to modify any storm water control measure will be recorded and maintained with the SWMP. 11. If no deficiencies are found during the inspection, the report will contain certification that the site is in compliance with the SWMP. Maintenance Procedures Maintenance will include prompt repairs and/or adjustments to any erosion and sediment control structures that are deteriorating or found to be performing inadequately. BMP conditions and dates of BMP maintenance will be documented within the storm water inspection checklists. Repairs are to be made as soon as possible and prior to the next anticipated storm event. 23 WEP II SWMP, 2011 Storm Water Management Plan (SWMP) Mid-America Pipeline Company, LLC Western Expansion Pipeline II Inspection Forms Inspection forms shall be a part of this SWMP and will include information such as dates of maintenance/modifications of existing BMPs, installation of new BMPs, any site housekeeping requirements, and general comments. Refer to Appendix C for an example of the storm water inspection document. 24 WEP II SWMP, 2011 Storm Water Management Plan (SWMP) Mid-America Pipeline Company, LLC Western Expansion Pipeline II 10.0 NON -STORM WATER DISCHARGES No allowable sources of non -storm water discharges are anticipated from the project. Some possible exceptions include, but are not limited to, fire prevention/suppression or dust control activities. 25 WEP II SWMP, 2011 Storm Water Management Plan (SWMP) Mid-America Pipeline Company, LLC Western Expansion Pipeline II 11.0 CERTIFICATIONS 11.1 Owner/Applicant Certification I certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations. Signature: Name: Title: Date: Operator Name and Address: Mid-America Pipeline Company, LLC PO Box 4324 Houston, Texas (713) 381-6500 Site Name and Location: SWMP Prepared by: WEP II SWMP, 2011 Western Expansion Pipeline II, Rio Blanco, Garfield, and Mesa Counties, CO. HRL Compliance Solutions, Inc. 744 Horizon Ct. Suite 140 Grand Junction Colorado, 81506 Phone: (970)-243-3271 26 Storm Water Management Plan (SWMP) Mid-America Pipeline Company, LLC Western Expansion Pipeline II 11.2 STORM WATER MANAGEMENT PLAN ADMINISTRATOR The SWMP Administrator is responsible for developing, implementing, maintaining, and revising the SWMP. This individual is responsible for the accuracy, completeness, and implementation of the SWMP. SWMP Administrator Certification I certify under penalty of law that I understand the terms and conditions of the 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: Mike Mungas Title: SWMP Administrator Date: Representing: Company: Mid-America Pipeline Company, LLC Address: PBox 4324 Address: Houston TX, 77210 Phone: (713) 381-7661 WEP II SWMP, 2011 27 Storm Water Management Plan (SWMP) Mid-America Pipeline Company, LLC Western Expansion Pipeline II 12.0 ADDITIONAL BMP REFERENCES The structural and non-structural BMPs listed in this SWMP 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 in this SWMP, or project personnel may need additional information on the installation, use, specifications, and/or maintenance of BMPs. Additional information regarding various BMPs is available by referencing the following: • For oil and gas operations, the Bureau of Land Management and U.S. Forest Service have developed "Surface Operating Standards and Guidelines for Oil and Gas Exploration and Development," "Gold Book." The most recent version (fourth edition) of this is available on the internet at: http://www.blm.govibmp/GoldBook_Draft_v12.pdf. • 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://swcc. state.al.us/pdf/AS WC_June_2003_Alabama_Handbook_ConstructionE&S_C ontrol.pdf. • For construction BMPs and surface stabilization methods, the Alabama Soil and Water Conservation Committee have developed "Erosion Control, Sediment Control and Storm Water 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://www.blm.gov/bmp/field%20guide.htm • 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 online at: http://www.blm.gov/bmp/field%20guide.htm • For seeding methods and applications information was obtained from the Practical Handbook of Disturbed Land Revegetation. Frank F. Munshower, CRC Press Inc. 1994 28 WEP II SWMP, 2011 Appendix A Site Map Western Expansion Pipeline II Colorado Segment -e-I oma -d o Mesa , I WEP II Centerline Colorado WEP II Centerline Utah HCSI ENVIRONMENTAL CONSULTANTS Appendix B Storm Water Application and Permit STATE OF COLORADO John W. Hickenlooper, Governor Christopher E. Urbina, MD, MPH Executive Director and Chief Medical Officer Dedicated to protecting and improving the health and environment of the people of Colorado 4300 Cherry Creek Dr. S. Denver, Colorado 80246-1530 Phone (303) 692-2000 Located in Glendale, Colorado http://www.cdphe.stale.co.us Laboratory Services Division 8100 Lowry Blvd, Denver, Colorado 80230-6928 (303) 692-3090 November 15, 2011 Leonard Mallett, Sr VP Enterprise Products Operating LLC PO Box 4324 Houston, TX 77210 Colorado Department of Public Health and Environment RE: Certification, Colorado Discharge Permit System Permit No., COR030000, Certification Number: COR031399 Dear Mr./Ms. Mallett; The Water Quality Control Division (the Division) has reviewed the application submitted for the WEP 11 Pipeline Project facility and determined that it qualifies for coverage under the COPS General Permit for Stormwater Discharges Associated with Construction Activities (the permit). Enclosed please find a copy of the permit certification, which was issued under the Colorado Water Quality Control Act. Facility: WEP II Pipeline Project Mesa. Rio Blanco, Garfield County Construction Activities: Oil and Gas Production and/or Exploration, Legal Contact (receives all Legal documentation pertaining to the permit Leonard Mallett, Sr VP Enterprise Products Operating LLC PO Box 4324 Houston, TX 77210 Facility Contact (contacted for general inquiries regarding the facility): Mike Mungas, Sr Environ Eng certification): Phone number: 713-381-6595 Email: snolan@eprod.com Billing Contact (receives the invoice pertaining to the permit certification): Shiver Nolan, Sr Compliance Adm Enterprise Products Operating LLC PO 4324 Houston, TX 77210 Any changes to the contacts listed above must be provided to the Division on a Change of Contact form. This form is available on the Division's website at colgradowateroermits.com. The Annual Fee for this certification is $245.00, and is invoiced every July. Do Not Pay This Now. The initial prorated invoice will be sent to the legal contact shortly. Phone number: 713-381-7661 Email; mgmungas@eprod.com Phone number: 713-381-6595 Email: snolan@eprod.com Please read the enclosed permit and certification. If you have any questions please contact Matt Czahor, Environmental Protection Specialist, at (303) 692-3575. Sincerely, JeLei Debbie Jessop, Program Assistant WATER QUALITY CONTROL DIVISION Enclosures: Certification page; General Permit; Highlight Sheet; Termination form xc: Regional Council of Government Mesa. Rio Blanco, Garfield County, Local County Health Department D.E., Technical Services Unit, WQCD Permit File RECEIVED NOV 22 2011 LEONARD MALLETT /dkj cert STATE OF COLORADO COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT WATER QUALITY CONTROL DIVISION TELEPHONE: (303) 692-3500 CERTIFICATION TO DISCHARGE UNDER CDPS GENERAL PERMIT COR -0300000 STORMWATER ASSOCIATED WITH CONSTRUCTION ACTIVITIES Construction Activities : Facility Located at: Certification Number: COR031399 This Certification to Discharge specifically authorizes: Enterprise Products Operating LLC to discharge stormwater from the facility identified as WEP 11 Pipeline Project to: see application - Colorado River Oil and Gas Production and/or Exploration, south of Hwy 201. (Baxter Pass), Uninc, Mesa. Rio Blanco, Garfield County, CO Latitude: 39.497466, Longitude: -108.957642 Certification is effective: 11/15/2011 Certification Expires: 6/30/2012 This certification under the permit requires that specific actions be performed at designated times. The certification holder is legally obligated to comply with all terms and conditions of the permit. Signed, Nathan Moore Construction/MS4/Pretreatment Unit Manager Water Quality Control Division Page 1 of 22 HIGHLIGHTS CONSTRUCTION ACTNITY STORMWATER GENERAL PERMIT PERMIT REQUIREMENTS: * Inspections: Inspection of stormwater management system required at least every 14 days and after any precipitation or snowmelt event that causes surface erosion. (See Inspections, page 12 of the permit, enclosed.) * Records: Records of inspections must be kept and be available for review by the Division. • Stormwater Management Plan (SWMP): A copy of the SWMP must be kept on the construction site at all times. PERMIT FEE: * Send payment only when you receive an invoice (sent once a year). PERMIT TERMINATION AND TRANSFER: * If the facility is finally stabilized, you may inactivate the permit, using the enclosed Division form. * "Final stabilization" is reached when all the construction is complete, paving is finished, and the vegetation (grass, etc.) is established, not just reseeded. See permit, page 9. * If the entire site changes ownership, you should transfer the permit to the new owner. * If part of the site will be sold to a new owner, you will need to reassign permit coverage. * Forms for these actions are available on our website, below. Also see page 5 of the permit. QUESTIONS? * www.coloradowaterpermits.com * Email cdphe.wgstorm a,state.co.us * Or call (303)692-3517, ask for Matt Czahor or Kathy Rosow 6/07 STATE OF COLORADO Bill Ritter, Jr., Governor James B. Martin, Executive Director Dedicated to protecting and improving the health and environment of the people of Colorado 4300 Cherry Creek Dr. S. Denver, Colorado 80246-1530 Phone (303) 692-2000 TDD Line (303) 691-7700 Located in Glendale, Colorado http://www.cdphe.state.co.us Laboratory Services Division 8100 Lowry Blvd. Denver, Colorado 80230-6928 (303) 692-3090 Colorado Water Quality Control Division Notice of Termination Construction Stormwater Inactivation Notice www.coloradowaterpermits.com Colorado Department of Public Health and Environmtent Print or type all information. All items must be filled out completely and correctly. If the form is not complete, it will be returned. All permit terminations dates are effective on the date approved by the Division. MAIL ORIGINAL FORM WITH INK SIGNATURES TO THE FOLLOWING ADDRESS: Colorado Dept of Public Health and Environment Water Quality Control Division 4300 Cherry Creek Dr South, WQCD-P-B2 Denver, CO 80246-1530 FAXED OR EMAILED FORMS WILL NOT BE ACCEPTED. • PART A. IDENTIFICATION OF PERMIT Please write the permit certification number to be terminated Permit Certification Number (four digits, not "DODO"): COR03 • PART B. PERMITTEE INFORMATION Company Name Mailing Address City Legal Contact Name Title • PART C. FACILITY/PROJECT INFORMATION Facility/Project Name Location (address) City Local Contact Name Title State Phone number Email Zip code County Phone number Email Zip code Page 1 of 2 form last revised July 2009 COLORADO WATER QUALITY CONTROL DIVISION NOTICE OF TERMINATION www.coloradowaterpermits.com • PART D. TERMINATION VALIDATION CRITERIA One of the criteria (1 or 2) below must be met, the appropriate box checked, and the required additional information provided. Part E includes a certification that the criteria indicated has been met, 1: Finally Stabilized or Construction Not Started -The permitted activities covered under the certification listed in Part A meet the requirements for FINAL STABILIZATION in accordance with the permit, the Stormwater Management Plan, and as described below. This criterion should also be selected if construction was never started and no land was disturbed, and an explanation of this condition provided in the description below. Final stabilization is reached when: all ground surface disturbing activities at the site have been completed including removal of all temporary erosion and sediment control measure, and uniform vegetative cover has been established with an individual plant density of at least 70 percent of predisturbance levels, or equivalent permanent, physical erosion reduction methods have been employed. REQUIRED for Criteria 1- Describe the methods used to meet the final stabilization c described above: Include an attachment if additional space is required. -OR- 2: Separate Permit Coverage or Full Reassignment - All ongoing construction activities, including all disturbed areas, covered under the permit certification listed in Part A have coverage under a separate CDPS stormwater construction permit, including the permit certification issued when Division's Reassignment Form was used by the permittee to reassign all areas/activities. REQUIRED for Criteria 2 — Provide the permit certification number covering the ongoing activities: CORO3 STOP! or this form will not be processed and the permit will remain active. One of the two criteria above MUST BE CHECKED and the required information for that criterion provided, • PART E. CERTIFICATION SIGNATURE (Rectuired for all Termination Requests) I understand that by submitting this notice of inactivation, I am no longer authorized to discharge stormwater associated with construction activity by the general permit. I understand that discharging pollutants in stormwater associated with construction activities to the waters of the State of Colorado, where such discharges are not authorized by a CDPS permit, is unlawful under the Colorado Water Quality Control Act and the Clean Water Act. I certify under penalty of law that I have personally examined and am familiar with the information submitted herein, and based on my inquiry of those individuals immediately responsible for obtaining the information, I believe that the information is true, accurate and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment. (See 18 U.S.0 1001 and 33 U.S.C. 1319.) I also certify that I am a duly authorized representative of the permittee named in Part B. Signature of Legally Responsible Party Date Signed Name (printed) Title Signatory requirements: This form shall be signed, dated, and certified for accuracy by the permittee in accordance with the following criteria: 1. In the case of a corporation, 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 operation from which the discharge described herein originates; 2. In the case of a partnership, by a general partner; 3. In the case of a sole proprietorship, by the proprietor; 4. In the case of a municipal, state, or other public operation, by wither a principal executive officer, ranking elected official, or other duly authorized employee. Page 2 of 2 form last revised July 2009 Page 2 of 22 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 (and specific allowable non-stormwater discharges in accordance with Part I.D.3 of the permit) 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, as of this date, in accordance with permit requirements and conditions set forth in Parts I and II hereof. All discharges authorized herein shall be consistent with the terms and conditions of this permit. This permit and the authorization to discharge shall expire at midnight, June 30, 2012. Issued and Signed this 31 S' day of May, 2007 COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT 4S( Janet S. Kieler Permits Section Manager Water Quality Control Division SIGNED AND ISSUED MAY 31, 2007 EFFECTIVE JULY 1, 2007 TABLE OF CONTENTS PART I A. COVERAGE UNDER THIS PERMIT............................................................. ............................ 3 1 _ Authority to Discharge ...................,,..,....,... 3 a) Applicable Sections........................................................................................................o...........,.., 3 b) Oil and Gas Constniction...................................................................... .......,,...,.......,.,.,.,...,.,.......,.......,, 3 2. Definitions ......................................................................................................,...,....»......,...,...,.....,.....,...............,• 3 3. Permit Coverage Without Application - Qualifying Local Programs3 a) Applicable Sections 3 b) Local Agency Authority 4 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. PetmiiCertification Procedures .....................................,.,..,......,. 4 a) Request for Additional Information 4 b) Automatic Coverage,..._ 5 c) Individual Permit Required 5 d) General vs. Individual Permit Coverage .............. .......... ....... ...,.....,..............,..,............. ..,.,... .............. 5 e) Local Agency Authority.................................................................................................... .................... 5 6. Inactivation Notice .............................................. ........ ....... ........ ........,..,....,........................... ........,........ .......... 7, Transfer of Permit........................,..................,........................,....,.........,.,...............................,.........»,..........,... 5 8. Reassignment of Permit, ................ ...... ....... ....... ............ .........._.. ...... . . . ................... ... ...................... 9. Sale of Residence to Homeowners ....................... ....... ........ .,...................... 6 10. Permit Expiration Date ........................................ ................................................................................................... 6 11. Individual Permit Criteria.. ................. ......... ..... ....... ........... ...... ........... ........ ..... ..... ........... . . 6 B. STORMWATER MANAGEMENT PLAN -GENERAL REQUIREMENTS ...................... 6 C. STORMWATER MANAGEMENT PLAN - CONTENTS.... ....... 1. Site Description 2. Site Map 3. Stonnwater Management Controls, a) SWMP Administrator...., b) Identification of Potential Pollutant Sources ................. c) Best Management Practices (BMPs) for Stormwater Pollution Prevention.................—. ............. _...... 8 4, Final Stabilization and Long-term Stormwater Management ....... .......................................................................... 9 5. Inspection and Maintenance l0 7 7 7 8 8 8 D. TERMS AND CONDITIONS 10 I. General Limitations........10 2. BMP implementation and Design Standards 10 3. Prohibition of Non-Stormwater Discharges , ...,. 11 4. Releases in Excess of Reportable Quantities 11 5, SWMP Requirements 11 a) SWMP Preparation and Implementation 11 b) SWMP Retention Requirements—..11 c) SW MP Review/Changes 11 d) Responsive SWMP Changes 12 6. Inspections .................................................. ............... ............ ........ 12 a) Minimum Inspection Schedule__ ......... . 12 b) Inspection Requirements...........................,.,.............._.....,.,.....,..,..........................................,.......,....,... l3 c) Required Actions Following Site Inspections l3 7. BMP Maintenance ....... ....................... 13 8. Replacement and Failed BMPs .......................................................,.....,....,......... ....,.. 14 9. Reporting............................................................................ ............................................................•..V......,....,.,. 14 -2a - TABLE OF CONTENTS (cont.) 2a-TABLBO9CONTENTS(c,nt.) 11. Total Maximum Daily Load (TMQK) .'.__.-~....-.......~...-----.,,.__~..—.~~ 14 FL ADDITIONAL DEFINITIONS ---_—'--------_-'---'.... '—.~ 4~..44---.'--.----'.---_. 15 F. <iENERAJ. REQUIREMENTS'--'-___---''.--.'--_---.._.--• ..--._''—_—_--__—'_--- 16 I. Signatory Requirements-.------.-------.—`_,._.—_,—.,—,--_---------------.~----. 16 2. Retention wfRecords -._------.-.-.---....----_,—.—.—.,—^-----------...—.---' 16 PART Il A. MANAGEMENT REQUIREMENTS--_—' '.--,_--,.—._-,--'-^.—.~__..-_._..~..~_..~ 17 L Amending a Permit Certification----_-_..._. .......... -...—_--...~..--__-_--...— 17 2. ---'-----'---..,~._.,..,.,.,._..^----.^--.----_--..—..... 17 4. Submission ofIncorrect orIncomplete Information . '--'.—_-..—..--.• ^.--.—.-_~ 18 5. Bypass---''----'----.—'--''------.----'~...'~~_—^--^_— .... —._—..'_—..,--.'-~ 18 6. Upsets ^. ..__ 18 7. Retnuved Swbwtmmcws.-....... --....................... ......... -.... ... .......... --~'._.-------.----.--.--`^` 18 8. Minimuzaion of Adverse-----._-_----.------.-------^-,-,-^---..- ..... -^-.,. 18 9. Rtduciion Loss. or Failure of Slorinwater Controls ... 19 10. Propes Operation and Maintenance 19 B. RESPONSIBILITIES---.—..,~.• -'''-_'-.-'----'----'_-'-_--_---_-_._ 19 1. Inspections and Right to Pntry. 19 2. Duty xoProvide Information -'_---...-----_--.-.-.----.-.---_--.-------.---._-_-. 19 J. Transfer mfOwnership u«Comm! ._... -.,-----.--.-.----.--._.---------_._-------' 19 4. Modification, Suspension, vrRevnca.timovfPermit ByDivision .-.---_-._-._ 20 C. Permit Violations 4—.--.---.--.--.-------.--.--.--_.------------- 21 6. Legal -.--.'--'----''.. - --_-'------'--- 21 7. Severability ---.—.—.----------....—.--.------.--.—_--.-----.-------.-------._.—. 21 0Renewal Application --_-----.----.-Fel —.—.—.—.—_—_—. ' .—. 21 4. Confidentiality. 21 |W` Fees-' ._--_..'-'_'-~.'..—..,_-----.---''----'--''—''''—_.—.'_--_.. 21 PART 1 A. COVERAGE UNDER THIS PERMIT Authority to Discharge PART I Permit - Page 3 Permit No. COR -030000 Under this permit, facilities are granted authorization to discharge stormwater associated with construction activities into waters of the state of Colorado. This permit also authorizes the discharge of specific allowable non-stormwater discharges, in accordance with Part 1.1.3 of the permit, which includes discharges to the ground. 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 (i.e., borrow or fill areas). This permit also authorizes stormwater discharges from dedicated asphalt batch plants and dedicated concrete batch plants. (Coverage under the construction site permit is not required for batch plants if they have alternate CDPS permit coverage.) This permit does not authorize the discharge of mine water or process water from such areas. a) Applicable Sections: In accordance with Part I.A.3 of this permit, some parts of this permit do not apply to sites covered under a Qualifying Local Program, as defined in I.A.2.d. For sites not covered by a Qualifying Local Program, all parts of the permit apply except Part I.A.3. The permittee will be responsible for determining and then complying with the applicable sections. b) Oil and Gas Construction: Stormwater discharges associated with construction activities directly related to oil and gas exploration, production, processing, and treatment operations or transmission facilities are regulated under the Colorado Discharge Permit System Regulations (5CCR 1002-61), and require coverage under this permit in accordance with that regulation. However, references in this permit to specific authority under the Federal Clean Water Act (CWA) do not apply to stormwater discharges associated with these oil and gas related construction activities, to the extent that the references are limited by the federal Energy Policy Act of 2005. 2. Definitions a) Stormwater: Stormwater is precipitation -induced surface runoff. b) Construction activity: Construction activity refers to ground surface disturbing activities, which include, but are not limited to, clearing, grading, excavation, demolition, installation of new or improved haul roads and access roads, staging areas, stockpiling of fill materials, and borrow areas. Construction does not include routine maintenance to maintain original line and grade, hydraulic capacity, or original purpose of the facility. Small construction activity: Stormwater 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 five acres. d) 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. Other Definitions: Definitions of additional terms can be found in Part I.E. of this permit. 3. Permit Coverage Without Application — for small construction activities under a Qualifying Local Program only If a small 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 1.A.1, 1.A.2, 1.A.3, 1.D.l, I.D.2, 1.D.3, 1.D.4, 1.D.7, I.D.8, L.D.11, LE and Part 11 of this permit, with the exception of Parts II.A.1, II.B.3,1I.B.8, and II. B10, apply. PART [ Permit - Page 4 Permit No. COR -030000 A. COVERAGE UNDER THIS PERMIT (cont.) b) 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. Permit Coverage Termination: When a site under a Qualifying Local Program has been finally stabilized, coverage under this permit is automatically terminated. d) Compliance with Qualifying Local Program: A construction site operator that has authorization to discharge under this permit under Part LA.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 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 operator must be notified in writing that an application for full coverage is required. When a permit certification under this permit is issued to an operator that would otherwise be covered under Part LA.3 of this permit, the full requirements of this permit replace the requirements as per Part LA.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 LD.1.g of this permit. 4. Application, Due Dates a) Application Due Dates: At least ten calendar days prior to the commencement of construction activities, the applicant shall submit an application form as provided by the Division, with a certification that the Stonnwater 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-Permits-B2 4300 Cherry Creek Drive South Denver, Colorado 80246-1530 b) Summary of Application: The application requires, at a minimum, the following: I) The applicant's company name; address; telephone number; and email address (if available); whether the applicant is the owner, developer, or contractor; and local contact information; 2) Project name, address, county and location of the construction site, including the latitude and longitude to the nearest 15 seconds of the approximate center of the construction activity; 3) Legal description or map of the construction site; 4) 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; 5) The nature of the construction activity; 6) The anticipated start date and final stabilization date for the project; 7) The name of the receiving water(s), or the municipal separate storm sewer system and the ultimate (i.e., named) receiving water(s); 8) Certification that the SWMP for the construction site is complete (see Part I.C. below); and 9) The signature of the applicant, signed in accordance with Part I.F.I of this permit. 5. Permit Certification Procedures If this general permit is appropriate for the applicant's operation, then a certification will be developed and the applicant will be authorized to discharge stormwater under this general permit. a) Request for Additional Information: The Division shall have up to ten calendar days after receipt of the above information to request additional data and/or deny the authorization for any particular discharge. Upon receipt of additional information, the Division shall have an additional ten calendar 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.) PARTI Permit - Page 5 Permit No. COR -030000 A. COVERAGE UNDER THIS PERMIT (cont.) b) Automatic Coverage: if the applicant does not receive a request for additional information or a notification of denial from the Division dated within ten calendar 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 the SWMP), it is found that this general permit is not appropriate for the operation, then the application will be processed as one for an individual permit. The applicant will be notified of the Division's decision to deny certification under this general permit. For an individual permit, additional information may be requested, and 180 days may be required to process the application and issue the permit. At the Division's discretion, temporary coverage under this general permit may be allowed until the individual permit goes into effect. d) General vs. individual Permit Coverage: Any permittee authorized by this permit may request to be excluded from the coverage of this permit by applying for an individual CDPS permit. The permittee shall submit an individual application, with reasons supporting the request, to the Division at least 180 days prior to arty discharge. e) 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 permittee must submit an Inactivation Notice form that is signed in accordance with Part LF.1. of this permit. The inactivation Notice form is available from the Division and includes: a) Permit certification number; b) The permittee's name, address, telephone number; c) Name, location, and county for the construction site for which the inactivation notice is being submitted; and d) Certification that the site has been finally stabilized, and a description of the final stabilization method(s). 7. Transfer of Permit When responsibility for stormwater discharges at a construction site changes from one entity to another, the permittee shall submit a completed Notice of Transfer and Acceptance of Terms form that is signed in accordance with Part I.F. I . of this permit. The Notice of Transfer form is available from the Division and includes: a) Permit certification number; b) Name, location, and county for the construction site for which the Notice of Transfer is being submitted; c) Identifying information for the new permittee; d) Identifying information for the current permittee; and e) Effective date of transfer. If the new responsible party will not complete the transfer form, the permit may be inactivated upon written request to the Division and completion of the Inactivation Notice if the permittee has no legal responsibility, through ownership or contract, for the construction activities at the site. In this case, the new owner or operator would be required to obtain permit coverage separately. 8. Reassignment of Permit When a permittee no longer has control of a specific portion of a permitted site, and wishes to transfer coverage of that portion of the site to a second party, the permittee shall submit a completed Notice of Reassignment of Permit Coverage form that is signed in accordance with Part I.F.I. of this permit. The Notice of Reassignment of Permit Coverage form is available from the Division and includes: a) Current permit certification number; b) Identifying information and certification as required by Part I.A.4.b for the new permittee; c) Identifying information for the current permittee, revised site information and certification for reassignment; and d) Effective date of reassignment. PART I Permit - Page 6 Permit No. COR -030000 A. COVERAGE UNDER THIS PERMIT (cont_) If the new responsible party will not complete the reassignment form, the applicable portion of the permitted site may be removed from permit coverage upon written request to the Division if the permittee has no legal responsibility, through ownership or contract, for the construction activities at the portion of the site. In this case, the new owner or operator would be required to obtain permit coverage separately. 9. Sale of Residence to Homeowners For residential construction only, when a residential lot has been conveyed to a homeowner and all criteria in paragraphs a through e, below, are met, coverage under this permit is no longer required and the conveyed lot may be removed from coverage under the permittee's certification. At such time, the permittee is no longer responsible for meeting the terms and conditions of this permit for the conveyed lot, including the requirement to transfer or reassign permit coverage. The permittee remains responsible for inactivation of the original certification. a) The lot has been sold to the homeowner(s) for private residential use; b) the lot is Less than one acre of disturbed area; c) alt construction activity conducted by the permittee on the lot is completed; d) a certificate of occupancy (or equivalent) has been awarded to the home owner; and e) the SWMP has been amended to indicate the lot is no longer covered by permit. Lots not meeting all of the above criteria require continued permit coverage. However, this permit coverage may be transferred (Part I.A.7, above) or reassigned (Part LA.8, above) to a new owner or operator. 10. Permit Expiration Date Authorization to discharge under this general permit shall expire on June 30, 2012. The Division must evaluate and reissue this general permit at least once every five years and must recertify the permittee's authority to discharge under the general permit at such time. Therefore, a permittee desiring continued coverage under the general permit must reapply by March 31, 2012. The Division will initiate the renewal process; however, it is ultimately the permittee's responsibility to ensure that the renewal is submitted. The Division will determine if the permittee may continue to operate under the terms of the general permit. An individual permit may be required for any facility not reauthorized to discharge under the reissued general permit. 11. Individual Permit Criteria. Various criteria can be used in evaluating whether or not an individual (or alternate general) permit is required instead of this general permit. This information may come from the application, SWMP, or additional information as requested by the Division, and includes, but is not limited to, the following: a) the quality of the 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; or e) discharges of pollutants of concern to waters for which there is an established Total Maximum Daily Load (TMDL). In addition, an individual permit may be required when the Division has shown or has reason to suspect that the stormwater discharge may contribute to a violation of a water quality standard. B. STORMWATER MANAGEMENT PLAN (SWMP) GENERAL REQUIREMENTS 1. A SWMP shall be developed for each facility covered by this permit. 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.) PART Permit - Page 7 Permit No. COR -030000 B. STORMWATER MANAGEMENT PLAN (SWMP) GENERAL REQUIREMENTS (cont.) 2. The SWMP shall: a) Identify all potential sources of pollution which may reasonably be expected to affect the quality of stormwater discharges associated with construction activity from the facility; b) Describe the practices to be used to reduce the pollutants in stormwater discharges associated with construction activity at the facility; and ensure the practices are selected and described in accordance with good engineering practices, including the installation, implementation and maintenance requirements; and c) Be properly prepared, and updated in accordance with Part 1.D.S.c, to ensure compliance with the terms and. conditions of this permit. 3. Facilities must implement the provisions of the SWMP as written and updated, from commencement of construction activity until final stabilization is complete, as a condition of this permit. The Division reserves the right to review the SWMP, and to require the permittee to develop and implement additional measures to prevent and control pollution as needed. 4, The SWMP may reflect requirements for Spill Prevention Control and Countermeasure (SPCC) plans under section 311 of the CWA, or Best Management Practices (BMPs) Programs otherwise required by a separate CDPS permit, and may incorporate any part of such plans into the SWMP by reference, provided that the relevant sections of such plans are available as part of the SWMP consistent with Part I.D.5.b. 5. For any sites with permit coverage before June 30, 2007, the permittee's SMWP must meet the new SWMP requirements as summarized in Section 11.1 of the rationale. Any needed changes must be made by October I, 2007. C. STORMWATER MANAGEMENT PLAN (SWMP) — CONTENTS The SWMP shall include the following items, at a minimum. 1. Site Description. The SWMP shall clearly describe the construction activity, to include: a) The nature of the construction activity at the site. b) The proposed sequence for major activities. c) Estimates of the total area of the site, and the area and location expected to be disturbed by clearing, excavation, grading, or other construction activities. d) A summary of any existing data used in the development of the site construction plans or SWMP that describe the soil or existing potential for soil erosion. e) A description of the existing vegetation at the site and an estimate of the percent vegetative ground cover. f) The location and description of all potential pollution sources, including ground surface disturbing activities (see Part I.A.2.b), vehicle fueling, storage of fertilizers or chemicals, etc. g) The location and description of any anticipated allowable sources of non-stormwater discharge at the site, e.g., uncontaminated springs, landscape irrigation return flow, construction dewatering, and concrete washout. h) The name of the receiving water(s) and the size, type and location of any outfall(s). If the stormwater discharge is to a municipal separate storm sewer system, the name of that system, the location of the storm sewer discharge, and the ultimate receiving water(s). 2. Site MaD. The SWMP shall include a legible site map(s), showing the entire site, identifying: a) construction site boundaries; b) all areas of ground surface disturbance; c) areas of cut and fill; d) areas used for storage of building materials, equipment, soil, or waste; e) locations of dedicated asphalt or concrete batch plants; t) locations of all structural BMPs; g) locations of non-structural BMPs as applicable; and h) locations of springs, streams, wetlands and other surface waters. PART Permit - Page 8 Permit No. COR -030000 C. STORMWATER MANAGEMENT PLAN (SWMP) — CONTENTS (cont.) 3. Stormwater Management Controls. The SWMP must include a description of all stormwater management controls that will be implemented as part of the construction activity to control pollutants in stormwater discharges. The appropriateness and priorities of stormwater management controls in the SWMP shall reflect the potential pollutant sources identified at the facility. The description of stormwater management controls shall address the following components, at a minimum: a) SWMP Administrator - The SWMP shall identify a specific individual(s), position or title who is responsible for developing, implementing, maintaining, and revising the SWMP. The activities and responsibilities of the administrator shall address all aspects of the facility's SWMP. b) Identification of Potential Pollutant Sources - All potential pollutant sources, including materials and activities, at a site must be evaluated for the potential to contribute pollutants to stormwater discharges. The SWMP shall identify and describe those sources determined to have the potential to contribute pollutants to stormwater discharges, and the sources must be controlled through BMP selection and implementation, as required in paragraph (c), below. At a minimum, each of the following sources and activities shall be evaluated for the potential to contribute pollutants to stormwater discharges, and identified in the SWMP if found to have such potential: 1) all disturbed and stored soils; 2) vehicle tracking of sediments; 3) management of contaminated soils; 4) loading and unloading operations; 5) outdoor storage activities (building materials, fertilizers, chemicals, etc.); 6) vehicle and equipment maintenance and fueling; 7) significant dust or particulate generating processes; 8) routine maintenance activities involving fertilizers, pesticides, detergents, fuels, solvents, oils, etc.; 9) on-site waste management practices (waste piles, liquid wastes, dumpsters, etc.); 10) concrete truck/equipment washing, including the concrete truck chute and associated fixtures and equipment; 11) dedicated asphalt and concrete batch plants; 12) non -industrial waste sources such as worker trash and portable toilets; and 13) other areas or procedures where potential spills can occur. c) Best Management Practices (BMPs) for Stormwater Pollution Prevention - The SWMP shall identify and describe appropriate BMPs, including, but not limited to, those required by paragraphs 1 through 8 below, that will be implemented at the facility to reduce the potential of the sources identified in Part 1.C.3.b to contribute pollutants to stormwater discharges. The SWMP shall clearly describe the installation and implementation specifications for each BMP identified in the SWMP to ensure proper implementation, operation and maintenance of the BMP. 1) Structural Practices for Erosion and Sediment Control. The SWMP shall clearly describe and locate all structural practices implemented at the site to minimize erosion and sediment transport. Practices may include, but are not limited to: straw bales, wattles/sediment control Togs, 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 for Erosion and Sediment Control. The SWMP shall clearly describe and locate, as applicable, all non-structural practices implemented at the site to minimize erosion and sediment transport. Description must include interim and permanent stabilization practices, and site-specific scheduling for implementation of the practices. The SWMP should include practices to ensure that existing vegetation is preserved where possible. Non-structural practices may include, but are not limited to: temporary vegetation, permanent vegetation, mulching, geotextiles, sod stabilization, slope roughening, vegetative buffer strips, protection of trees, and preservation of mature vegetation. PART I Permit - Page 9 Permit No. COR -030000 C. STORMWATER MANAGEMENT PLAN (SWMP) — CONTENTS (cont) 3) Phased BMP Implementation. The SWMP shalt clearly describe the relationship between the phases of construction, and the implementation and maintenance of both structural and non-structural stormwater management controls. The SWMP must identify the stormwater management controls to be implemented during the project phases, which can include, but are not limited to, clearing and grubbing; road construction; utility and infrastructure installation; vertical construction; final grading; and final stabilization. 4) Materials Handlingand Spill Prevention. The SWMP shall clearly describe and locate all practices implemented at the site to minimize impacts from procedures or significant materials (see definitions at Part I.E.) that could contribute pollutants to runoff. Such procedures or significant materials could include: exposed storage of building materials; paints and solvents; fertilizers or chemicals; waste material; and equipment maintenance or fueling procedures. Areas or procedures where potential spills can occur must have spill prevention and response procedures identified in the SWMP. 5) Dedicated Concrete or Asphalt Batch Plants. The SWMP shall clearly describe and locate all practices implemented at the site to control stormwater pollution from dedicated concrete batch plants or dedicated asphalt batch plants covered by this certification. 6) Vehicle Tracking Control. The SWMP shall clearly describe and locate all practices implemented at the site to control potential sediment discharges from vehicle tracking. Practices must be implemented for all areas of potential vehicle tracking, and can include: minimizing site access; street sweeping or scraping; tracking pads; graveled parking areas; requiring that vehicles stay on paved areas on-site; wash racks; contractor education; and/or sediment control BMPs, etc. 7) Waste Mana;eement and Disposal, Including Concrete Washout. i) The SWMP shall clearly describe and locate the practices implemented at the site to control stormwater pollution from all construction site wastes (liquid and solid), including concrete washout activities. ii) The practices used for concrete washout must ensure that these activities do not result in the contribution of pollutants associated with the washing activity to stormwater runoff. iii) Part I.D.3.c of the permit authorizes the conditional discharge of concrete washout water to the ground. The SWMP shall clearly describe and locate the practices to be used that will ensure that no washout water from concrete washout activities is discharged from the site as surface runoff or to surface waters. 8) Groundwater and Stormwater Dewatering. i) The SWMP shall clearly describe and locate the practices implemented at the site to control stormwater pollution from the dewatering of groundwater or stormwater from excavations, wells, etc. ii) Part LD.3.d of the permit authorizes the conditional discharge of construction dewatering to the ground. For any construction dewatering of groundwater not authorized under a separate CDPS discharge permit, the SWMP shall clearly describe and locate the practices to be used that will ensure that no groundwater from construction dewatering is discharged from the site as surface runoff or to surface waters. 4. Final Stabilization and Long-term Stormwater Management a) The SWMP shall clearly describe the practices used to achieve final stabilization of all disturbed areas at the site, and any planned practices to control pollutants in stormwater discharges that will occur after construction operations have been completed at the site. b) Final stabilization practices for obtaining a vegetative cover should include, as appropriate: seed mix selection and application methods; soil preparation and amendments; soil stabilization practices (e.g., crimped straw, hydro mulch or rolled erosion control products); and appropriate sediment control. BMPs as needed until final stabilization is achieved; etc. PART I Permit - Page 10 Permit No. COR -030000 C. STORMWATER MANAGEMENT PLAN (SWMP) CONTENTS (cont.) c) Final stabilization is reached when all ground surface disturbing activities at the site have been completed, and uniform vegetative cover has been established with an individual plant density of at Least 70 percent of pre - disturbance levels, or equivalent permanent, physical erosion reduction methods have been employed. The Division may, after consultation with the permittee and upon good cause, amend the final stabilization criteria in this section for specific operations. 5. Inspection and Maintenance Part LD.b of the permit includes requirements for site inspections. Part I.D.7 of the permit includes requirements for BMP maintenance. The SWMP shall clearly describe the inspection and maintenance procedures implemented at the site to maintain all erosion and sediment control practices and other protective practices identified in the SWMP, in good and effective operating condition. D. TERMS AND CONDITIONS 1. General Limitations The following limitations shall apply to all discharges covered by this permit: a) Stormwater discharges from construction activities shall not cause, have the reasonable potential to cause, or measurably contribute to an exceedance of any water quality standard, including narrative standards for water quality. b) Concrete washout water shall not be discharged to state surface waters or to storm sewer systems. On-site permanent disposal of concrete washout waste is not authorized by this permit. Discharge to the ground of concrete washout waste that will subsequently be disposed of off-site is authorized by this permit. See Part I.D.3.c of the permit. c) Bulk storage structures for petroleum products and any other chemicals shall have secondary containment or equivalent 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 correspondence. 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. f) All site wastes must be properly managed to prevent potential pollution of State waters. This permit does not authorize on-site waste disposal. g) All dischargers must comply with the lawful requirements of federal agencies, 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 programs developed to comply with CDPS permits. Dischargers must comply with local stormwater management requirements, policies or guidelines including erosion and sediment control. 2. BMP Implementation and Design Standards Facilities must select, install, implement, and maintain appropriate BMPs, following good engineering, hydrologic and pollution control practices. BMPs implemented at the site must be adequately designed to provide control for all potential pollutant sources associated with construction activity to prevent pollution or degradation of State waters. PART I Permit - Page 11 Permit No. COR -030000 D. TERMS AND CONDITIONS (cont.) 3. Prohibition of Non-Stormwater Discharges a) Except as provided in paragraphs b, c, and d below, all discharges covered by this permit shall be composed entirely of stormwater associated with construction activity. 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-stormwater component of the discharge is identified in the SWMP (see Part I.C.I.g of this permit): - emergency fire fighting activities - landscape irrigation return flow - uncontaminated springs e) Discharges to the ground of concrete washout water from washing of tools and concrete mixer chutes may be authorized by this permit, provided that: 1) the source is identified in the SWMP; 2) BMPs are included in the SWMP in accordance with Part I.C.3(c)(7) and to prevent pollution of groundwater in violation of Part 1.D. l.a; and 3) these discharges do not leave the site as surface runoff or to surface waters d) Discharges to the ground of water from construction dewatering activities may be authorized by this permit, provided that: 1) the source is groundwater and/or groundwater combined with stormwater that does not contain pollutants in concentrations exceeding the State groundwater standards in Regulations 5 CCR 1002-41 and 42; 2) the source is identified in the SWMP; 3) BMPs are included in the SWMP, as required by Part I.C.3(c)(8); and 4) these discharges do not leave the site as surface runoff or to surface waters. Discharges to the ground from construction dewatering activities that do not meet the above criteria must be covered under a separate CDPS discharge permit. Contaminated groundwater requiring coverage under a separate CDPS discharge permit may include groundwater contaminated with pollutants from a landfill, mining activity, industrial pollutant plume, underground storage tank, or other source. 4. Releases in Excess of Reportable Ouantities 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 Noncompliance Notification Requirements (see Part II.A.3 of the permit). 5. SWMP Requirements a) SWMP Preparation and Implementation: The SWMP shall be prepared prior to applying for coverage under the general permit, and certification of its completion submitted with the application. The SWMP shall be implemented prior to commencement of construction activities. The plan shall be updated as appropriate (see paragraph c, below), below). SWMP provisions shall be implemented until expiration or inactivation of permit coverage. b) SWMP Retention Requirements: A copy of the SWMP must be retained on site unless another location, specified by the permittee, is approved by the Division. c) SWMP Review/Changes: The permittee shall amend the SWMP: 1) when there is a change in design, construction, operation, or maintenance of the site, which would require the implementation of new or revised BMPs; or 2) if the SWMP proves to be ineffective in achieving the general objectives of controlling pollutants in stormwater discharges associated with construction activity; or PART I Permit - Page 12 Permit No. COR -030000 D. TERMS AND CONDITIONS (cont.) 3) when BMPs are no longer necessary and are removed. SWMP changes shall be made prior to changes in the site conditions, except as allowed for in paragraph d, below. SWMP revisions may include, but are not limited to: potential pollutant source identification; selection of appropriate BMPs for site conditions; BMP maintenance procedures; and interim and final stabilization practices. The SWMP changes may include a schedule for further BMP design and implementation, provided that, if any interim BMPs are needed to comply with the permit, they are also included in the SWMP and implemented during the interim period. Responsive SWMP Changes: SWMP changes addressing BMP installation and/or implementation are often required to be made in response to changing conditions, or when current BMPs are determined ineffective. The majority of SWMP revisions to address these changes can be made immediately with quick in -the -field revisions to the SWMP. In the less common scenario where more complex development of materials to modify the SWMP is necessary, SWMP revisions shall be made in accordance with the following requirements: 1) the SWMP shall be revised as soon as practicable, but in no case more than 72 hours after the change(s) in BMP installation and/or implementation occur at the site, and 2) a notation must be included in the SWMP prior to the site change(s) that includes the time and date of the change(s) in the field, an identification of the BMP(s) removed or added, and the location(s) of those BMP(s). 6. Inspections Site inspections must be conducted in accordance with the following requirements and minimum schedules. The required minimum inspection schedules do not reduce or eliminate the permittee's responsibility to implement and maintain BMPs in good and effective operational condition, and in accordance with the SWMP, which could require more frequent inspections. a) Minimum Inspection Schedule: The permittee shall, at a minimum, make a thorough inspection, in accordance with the requirements in I.D.6.b below, at least once every 14 calendar days. Also, post -storm event inspections must be conducted within 24 hours after the end of any precipitation or snowmelt event that causes surface erosion. Provided the timing is appropriate, the post -storm inspections may be used to fulfill the 14 -day routine inspection requirement. A more frequent inspection schedule than the minimum inspections described may be necessary, to ensure that BMPs continue to operate as needed to comply with the permit. The following conditional modifications to this Minimum Inspection Schedule are allowed: 1) Post -Storm Event Inspections at Temporarily Idle Sites — If no construction activities will occur following a storm event, post -storm event inspections shall be conducted prior to re -commencing construction activities, but no later than 72 hours following the storm event. The occurrence of any such delayed inspection must be documented in the inspection record. Routine inspections still must be conducted at least every 14 calendar days. 2) Inspections at Completed Sites/Areas — For sites or portions of sites that meet the following criteria, but final stabilization has not been achieved due to a vegetative cover that has not become established, the permittee shall make a thorough inspection of their stormwater management system at least once every month, and post - storm event inspections are not required. This reduced inspection schedule is only allowed if: i) all construction activities that will result in surface ground disturbance are completed; ii) all activities required for final stabilization, in accordance with the SWMP, have been completed, with the exception of the application of seed that has not occurred due to seasonal conditions or the necessity for additional seed application to augment previous efforts; and iii) the SWMP has been amended to indicate those areas that will be inspected in accordance with the reduced schedule allowed for in this paragraph. PART I Permit - Page 13 Permit No. COR -030000 D. TERMS AND CONDITIONS (cont.) 3) Winter Conditions Inspections Exclusion - Inspections are not required at sites where construction activities are temporarily halted, snow cover exists over the entire site for an extended period, and melting conditions posing a risk of surface erosion do not exist. This exception is applicable only during the period where melting conditions do not exist, and applies to the routine 14 -day and monthly inspections, as well as the post -storm - event inspections. The following information must be documented in the inspection record for use of this exclusion: dates when snow cover occurred, date when construction activities ceased, and date melting conditions began. Inspections, as described above, are required at all other times. When site conditions make the schedule required in this section impractical, the permittee may petition the Division to grant an alternate inspection schedule. b) Inspection Requirements 1) Inspection Scope - The construction site perimeter, all disturbed areas, material and/or waste storage areas that are exposed to precipitation, discharge locations, and locations where vehicles access the site shall be inspected for evidence of, or the potential for, pollutants leaving the construction site boundaries, entering the stormwater drainage system, or discharging to state waters. All erosion and sediment control practices identified in the SWMP shall be evaluated to ensure that they are maintained and operating correctly. 2) Inspection Report/Records - The permittee shall keep a record of inspections. Inspection reports must identify any incidents of non-compliance with the terms and conditions of this permit. Inspection records must be retained for three years from expiration or inactivation of permit coverage. At a minimum, the inspection report must include: i) The inspection date; ii) Name(s) and title(s) of personnel making the inspection; iii) Location(s) of discharges of sediment or other pollutants from the site; iv) Location(s) of BMPs that need to be maintained; v) Location(s) of BMPs that failed to operate as designed or proved inadequate for a particular location; vi) Location(s) where additional BMPs are needed that were not in place at the time of inspection; vii) Deviations from the minimum inspection schedule as provided in Part I.D.6.a above; vii) Description of corrective action for items iii, iv, v, and vi, above, dates corrective action(s) taken, and measures taken to prevent future violations, including requisite changes to the SWMP, as necessary; and viii) After adequate corrective action(s) has been taken, or where a report does not identify any incidents requiring corrective action, the report shall contain a signed statement indicating the site is in compliance with the permit to the best of the signer's knowledge and belief. Required Actions Following Site Inspections - Where site inspections note the need for BMP maintenance activities, BMPs must be maintained in accordance with the SWMP and Part I.D.7 of the permit. Repair, replacement, or installation of new BMPs determined necessary during site inspections to address ineffective or inadequate BMPs must be conducted in accordance with Part I.D.8 of the permit. SWMP updates required as a result of deficiencies in the SWMP noted during site inspections shall be made in accordance with Part I.D.5.c of the permit. 7. BMP Maintenance All erosion and sediment control practices and other protective measures identified in the SWMP must be maintained in effective operating condition, Proper selection and installation of BMPs and implementation of comprehensive Inspection and Maintenance procedures, in accordance with the SWMP, should be adequate to meet this condition. BMPs that are not adequately maintained in accordance with good engineering, hydrologic and pollution control practices, including removal of collected sediment outside the acceptable tolerances of the BMPs, are considered to be no longer operating effectively and must be addressed in accordance with Part LD.8, below. A specific timeline for implementing maintenance procedures is not included in this permit because BMP maintenance is expected to be proactive, not responsive. Observations resulting in BMP maintenance activities can be made during a site inspection, or during general observations of site conditions. PART Permit - Page 14 Permit No. COR -030000 D. TERMS AND CONDITIONS (cont.) 8. Replacement and Failed BMPs Adequate site assessment must be performed as part of comprehensive Inspection and Maintenance procedures, to assess the adequacy of BMPs at the site, and the necessity of changes to those BMPs to ensure continued effective performance. Where site assessment results in the determination that new or replacement BMPs are necessary, the BMPs must be installed to ensure on-going implementation of BMPs as per Part I.D.2. Where BMPs have failed, resulting in noncompliance with Part I.D.2, they must be addressed as soon as possible, immediately in most cases, to minimize the discharge of pollutants. When new BMPs are installed or BMPs are replaced, the SWMP must be updated in accordance with Part I.D.5(c). 9. Reporting No scheduled reporting requirements are included in this permit; however, the Division reserves the right to request that a copy of the inspection reports be submitted. 10. SWMP Availability A copy of the SWMP shall be provided upon request to the Division, EPA, or any local agency in charge of approving sediment and erosion plans, grading plans or stormwater management plans, and within the time frame specified in the request. If the SWMP is required to be submitted to any of these entities, it must include a signed certification in accordance with Part I.F. I of the permit, certifying that the SWMP is complete and meets all permit requirements. All SWMPs required under this permit are considered reports that shall be available to the public under Section 308(b) of the CWA and Section 61.5(4) of the Colorado Discharge Permit System Regulations. The permittee shall make plans available to members of the public upon request. However, the permittee may claim any portion of a SWMP as confidential in accordance with 40 CFR Part 2. 11. Total Maximum Daily Load (TMDL) If a TMDL has been approved for any waterbody into which the permittee discharges, and stormwater discharges associated with construction activity have been assigned a pollutant -specific Wasteload Allocation (WLA) under the TMDL, the Division will either: a) Ensure that the WLA is being implemented properly through alternative local requirements, such as by a municipal stormwater permit; or b) Notify the permittee of the WLA, and amend the permittee's certification to add specific BMPs and/or other requirements, as appropriate. The permittee may be required to do the following: l) Under the permittee's SWMP, implement specific management practices based on requirements of the WLA, and evaluate whether the requirements are being met through implementation of existing stormwater BMPs or if additional BMPs are necessary. Document the calculations or other evidence that show that the requirements are expected to be met; and 2) If the evaluation shows that additional or modified BMPs are necessary, describe the type and schedule for the BMP additions/revisions. Discharge monitoring may also be required. The permittee may maintain coverage under the general permit provided they comply with the applicable requirements outlined above. The Division reserves the right to require individual or alternate general permit coverage. PART 1 Permit - Page 15 Permit No. COR -030000 E. ADDITIONAL DEFINITIONS For the purposes of this permit: 1. Best Management Practices (BMPs): 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, pollution prevention, and practices to control site runoff, spillage or leaks, waste disposal, or drainage from material storage. 2. 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. 3. Final stabilization: when all ground surface disturbing activities at the site have been completed, and uniform vegetative cover has been established with an individual plant density of at least 70 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 will be considered final stabilization. 4. Municipal separate 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. 5. Operator: the entity that 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 of a construction project, different types of parties may satisfy the definition of 'operator' and that the permit may be transferred as the roles change. 6. Outfall: a point source at the point where stormwater leaves the construction site and discharges to a receiving water or a stormwater collection system. 7. Part of a 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. 8. 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 pattem. 9. Pollutant: dredged spoil, dirt, slurry, solid waste, incinerator residue, sewage, sewage sludge, garbage, trash, chemical waste, biological nutrient, biological material, radioactive material, heat, wrecked or discarded equipment, rock, sand, or any industrial, municipal or agricultural waste. 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 classified stream segment (including tributaries) in the State of Colorado into which stormwater related to construction activities discharges. This definition includes all water courses, even if they are usually dry, such as borrow ditches, arroyos, and other unnamed waterways. 12. Significant Materials include, but are not limited to: raw materials; fuels; materials such as solvents, detergents, and plastic pellets; finished materials such as metallic products; raw materials used in food processing or production; hazardous substances designated under section 101(14) ofCERCLA; any chemical the facility is required to report pursuant to section 313 of title 111 of SARA; Fertilizers; pesticides; and waste products such as ashes, slag and sludge that have the potential to be released with stormwater discharge. 13. Stormwater: precipitation -induced surface runoff. PART I Permit - Page 16 Permit No. COR -030000 F. GENERAL REQUIREMENTS 1. Signatory Requirements a) All reports required for submittal shall be 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; 3) In the case of a sole proprietorship, by the proprietor; 4) In the case of a municipal, state, or other public facility, by either a principal executive officer, ranking elected official, or other duly authorized employee, if such representative is responsible for the overall operation of the facility from which the discharge described in the form originates. b) Changes to authorization. Han 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. c) Certification. Any person signing a document under paragraph a) of this section shall make the following certification: "I certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations." 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 three years after expiration or inactivation of permit coverage. b) The permittee shall retain a copy of the SWMP required by this permit at the construction site from the date of project initiation to the date of expiration or inactivation of permit coverage, unless another location, specified by the permittee, is approved by the Division. 3. Monitoring The Division reserves the right to require sampling and testing, on a case-by-case basis (see Part I.D.1.e), for example to implement the provisions of a TMDL (see Part 1.D. I I of the permit). Reporting procedures for any monitoring data collected will be included in the notification by the Division of monitoring requirements. If monitoring is required, the following definitions apply: a) The thirty (30) day average shall be determined by the arithmetic mean of all samples collected during a thirty (30) consecutive -day period. b) A grab sample, for monitoring requirements, is a single "dip and take" sample. PART 1I A. MANAGEMENT REQUIREMENTS 1. Amending a Permit Certification The permittee shall inform the Division (Permits Section) in writing of changes to the information provided in the permit application, including the legal contact, the project legal description or map originally submitted with the application, or the planned total disturbed acreage. The permittee shall furnish the Division with any plans and specifications which the Division deems reasonably necessary to evaluate the effect on the discharge and receiving stream. If applicable, this notification may be accomplished through submittal of an application for a CDPS process water permit authorizing the discharge. The SWMP shall be updated and implemented prior to the changes (see Part LD.5.c). Any discharge to the waters of the State from a point source other than specifically authorized by this permit or a different CDPS permit is prohibited. 2. Special Notifications - Definitions a) Spill: An unintentional release of solid or liquid material which may cause pollution of state waters. b) Upset: An exceptional incident in which there is unintentional and temporary noncompliance with permit discharge 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. 3. Noncompliance Notification a) The permittee shall report the following instances of noncompliance: I) Any noncompliance which may endanger health or the environment; 2) Any spill or discharge of hazardous substances or oil which may cause pollution of the waters of the state. 3) Any discharge of stormwater which may cause an exceedance of a water quality standard. b) For all instances of noncompliance based on environmental hazards and chemical spills and releases, all needed information must be provided orally to the Colorado Department of Public Health and Environment spill reporting line (24-hour number for environmental hazards and chemical spills and releases: 1-877-518-5608) within 24 hours from the time the permittee becomes aware of the circumstances. For all other instances of noncompliance as defined in this section, all needed information must be provided orally to the Water Quality Control Division within 24 hours from the time the permittee becomes aware of the circumstances. For all instances of noncompliance identified here, a written submission shall also be provided within 5 calendar days of the time the permittee becomes aware of the circumstances. The written submission shall contain a description of: 1) The noncompliance and its cause; 2) The period of noncompliance, including exact dates and times, and if the noncompliance has not been corrected, the anticipated time it is expected to continue; 3) Steps taken or planned to reduce, eliminate, and prevent reoccurrence of the noncompliance. A. MANAGEMENT REQUIREMENTS (cont.) 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, or relevant new information becomes available, 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 a) A bypass, which causes effluent limitations (i.e., requirements to implement BMPs in accordance with Parts I.B.3 and I.D.2 of the permit) to be exceeded is prohibited, and the Division may take enforcement action against a permittee for such a bypass, unless: I) Bypass was unavoidable to prevent loss of life, personal injury, or severe property damage; 2) There were no feasible alternatives to the bypass, such as the use of auxiliary treatment facilities (e.g., alternative BMPs), retention of untreated wastes, or maintenance during normal periods of equipment downtime. This condition is not satisfied if the permittee could have installed adequate backup equipment (e.g., implemented additional BMPs) to prevent a bypass which occurred during normal periods of equipment downtime or preventative maintenance; and 3) The permittee submitted notices as required in "Non -Compliance Notification," Part 11.A.3. 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 are met. (No determination made during administrative review of claims that noncompliance was caused by upset, and before an action for noncompliance, is final 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: 1) 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 II.A.3. of this permit (24-hour notice); and 4) The permittee complied with any remedial measures required under 40 CFR Section 122.41(d) of the federal regulations or Section 61.8(3)(h) of the Colorado Discharge Permit System 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 Substances Solids, sludges, or other pollutants removed in the course of treatment or control of discharges shall be properly disposed of in a manner such as to prevent any pollutant from such materials from entering waters of the State. 8. 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 terms and conditions specified in this permit, including such accelerated or additional monitoring as necessary to determine the nature and impact of the noncomplying discharge. A. MANAGEMENT REQUIREMENTS (cont.) 9. Reduction, Loss, or Failure of Stormwater Controls 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 any stormwater controls, the permittee shall, to the extent necessary to maintain compliance with its permit, control production, or remove all pollutant sources from exposure to stormwater, or both, until the stormwater controls are restored or an alternative method of treatment/control 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. Proper Operation and 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 effective 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. B. RESPONSIBILITIES 1. Inspections and Right to Entry The permittee shall allow the Director of the State Water Quality Control Division, the EPA Regional Administrator, and/or their authorized representative(s), 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 c) To enter upon the permittee'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 may 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 other matters related to the permit, and access to any and all facilities or areas within the permittee's premises that may have any effect on the discharge, permit, or any alleged violation. 2. Duty to Provide Information The permittee shall furnish to the Division, within the time frame specified by the Division, 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 as outlined in Part I.A.7; and b) The notice includes a written agreement between the existing and new permittees containing a specific date for transfer of permit responsibility, coverage and liability between them; and c) The current permittee has met all fee requirements of the Colorado Discharge Permit System Regulations, Section 61.15. B. RESPONSIBILITIES (cont.) 4. Modification, Suspension, or Revocation of Permit By Division All permit modification, inactivation or revocation and reissuance actions shall be subject to the requirements of the Colorado Discharge Permit System Regulations, Sections 61.5(2), 61.5(3), 61.7 and 61.15, 5 C.C.R. 1002-61, except for minor modifications. a) This permit, and/or 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: 1) 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 the 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, and/or certification under this permit, may be 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 State Act or federal requirements; or 3) Control regulations promulgated; or 4) Other available information indicates a potential for violation of adopted Water Quality Standards or stream classifications. c) This permit, or certification under this permit, may be modified in whole or in part to include new effluent limitations and other appropriate permit conditions where data submitted pursuant to Part I indicate that such effluent limitations and permit conditions are necessary to ensure compliance 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 the Colorado Discharge Permit System Regulations have been met; and 5) Applicable 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. B. RESPONSIBILITIES (cont.) 5. Permit Violations Failure to comply with any terms and/or conditions of this 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(b)(14) and Section 61.3(2) of the Colorado Discharge Permit System Regulations, which do not obtain coverage under this or other Colorado general permits, or under an individual CDPS permit regulating industrial stormwater, will be in violation of the federal Clean Water Act and the Colorado Water Quality Control Act, 25-8-101, as amended. Failure to comply with CDPS permit requirements will also constitute a violation. 6. Legal Responsibilities The issuance of this 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 authorize any injury to private property or any invasion of personal rights, nor any infringement of Federal, State or local laws 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 established pursuant to any applicable State law or regulation under authority granted by Section 510 of the Clean Water Act. 7. Severability The provisions of this permit are severable. If any provisions of this permit, or the application of any provision of this permit to any circumstance, are held invalid, the application of such provision to other circumstances and the application of the remainder of this permit shall not be affected. 8. Renewal Application if the 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 be 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 I1.B.4.d. 9. Confidentiality Except for data determined to be confidential under Section 308 of the Federal Clean Water Act and Colorado Discharge Permit System Regulations, Section 61.5(4), all reports prepared in 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 sates or marketing data which has been declared confidential by the permittee, and which may be 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. Fees 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. seq., C.R.S. 1973 as amended. B. RESPONSIBILITIES (cont.) 11. Requiring an Individual CDPS Permit The Director may require the permittee to apply for and obtain an individual or alternate general CDPS permit if: a) The discharger is not in compliance with the conditions of this general permit; b) Conditions or standards have changed so that the discharge no longer qualifies for a general permit; or c) Data/information become available which indicate water quality standards may be violated. The permittee must be notified in writing that an application for an individual or alternate general CDPS permit is required. When an individual or alternate general CDPS permit is issued to an operator otherwise covered under this general permit, the applicability of this general permit to that operator is automatically inactivated upon the effective date of the individual or alternate general CDPS permit. Water Quality Control Division WQCD-P-B2 4300 Cherry Creek Drive South Denver, Colorado 80246-1530 RATIONALE STORMWAT ER DISCHARGES ASSOCIATED WITH CONSTRUCTION ACTIVITY GENERAL PERMIT IN COLORADO THIRD RENEWAL COLORADO DISCHARGE PERMIT NUMBER COR -030000 CONTENTS PAGE I, Introduction 1 11. Changes in this General Permit 1 III. Background 8 IV. Stormwater Discharges Associated with Construction Activity 9 V. Coverage Under this Permit 10 VL Application and Certification I0 VII. Qualfing Local Programs 11 VIll. Terms and Conditions of Permit 11 IX. Public Notice 12/22/06 15 X. Public Notice - 3/23/07 15 I. INTRODUCTION This permit is for the regulation of stormwater runoff from construction activities, and specific allowable non- stormwater discharges in accordance with Part LD.3 of the permit. The term "construction activity" includes ground surface disturbing activities, including, but not limited to, clearing, grading, excavation, demolition, installation of new or improved haul and access roads, staging areas, stockpiling of fill materials, and borrow areas. "Stormwater" is precipitation -induced surface runoff. This rationale will explain the background of the Stormwater program, activities which are covered under this permit, how to apply for coverage under this permit, and the requirements of this permit. The forms discussed in the rationale and permit are available on the Water Quality Control Division's website al: ;vww.cdphe.state.co.us/wa/PermitsUnit 11. CHANGES IN THIS GENERAL PERMIT Several notable changes from the previous General Permit for Construction Activities have been incorporated into this permit. Significant changes are listed below. Numerous other minor changes were made for clarification purposes only. A. Authority to Discharge This section has been restructured to list all of the types of activities covered by this permit, and to be consistent with the definition of "construction activity." The definition of construction activity has been expanded to provide clarification, See Part I.A.1 of the permit. PART ❑ Permit - Page 24 Permit No. COR -030000 11. CHANGES IN THIS GENERAL PERMIT (cont.) B. Authority to Discharge Oil and Gas Construction This section has been added, to take into account a regulatory change, The federal Energy Policy Act of 2005 exempts nearly all oil and gas construction activities from federal requirements under the Clean Water Act's NPDES stormwater discharge permit program. In January 2006, the Colorado Water Quality Control Commission held a hearing to determine what effects, if any, the change in federal law would have upon Colorado's stormwater regulations. The Commission determined that oil and gas construction sites in Colorado that disturb one or more acres are still required to be covered under Colorado's stormwater permitting regulations (Colorado Discharge Permit System (CDPS) regulations (5CCR 1002-61)). In practice, oil and gas construction sites have the same requirements under this permit as do other types of construction. However, this permit contains some references to the federal Clean Water Act; generally these references are not applicable to oil and gas construction sites to the extent that the references are limited by the federal Energy Policy Act of 2005. See Part LA.1(b) of the permit. C. Application Requirements The permit application requirements have changed slightly, including the addition of an email address, if available. See Part LA.4(b). The applicant must be either the owner and/or operator of the construction site, An operator at a construction site that is not covered by a certification held by an appropriate entity may be held liable for operating without the necessary permit coverage. D. Temporary Coverage Part I.A.5(d) of the previous permit (effective July 1, 2002) dealt with temporarily covering a facility under the general permit even if an individual permit is more appropriate. This permit section essentially duplicated the previous section (see Part LA.5(c)), and so it has been deleted. E. Reassignment of Permit Coverage Procedures have been added to clam the requirements for the transfer of coverage of specific portions of a permitted site to a second party. See Section V1111.3 of the rationale and Part LA.8 of the permit. F. Individual Permit Criteria This section has been modified to include situations involving a Total Maximum Daily Load (TMDL). See Part LA.11 of the permit. G. Stormwater Management Plan (SWMP) The Stormwater Management Plan section has been divided into two parts Stormwater Management Plan (SWMP) — General Requirements, which provides the basic framework and general requirements for the SWMP, and Stormwater Management Plan (SWMP) — Contents, which specifically identifies each item that must be addressed in the SWMP. See Parts I.B and I.0 of the permit. H. Stormwater Management Plan (SWMP) — General Requirements The SWMP General Requirements section has been modified to require that the SWMP be updated in accordance with Parts I.D.5(c) and I.D.5(d) of the permit (SWMP Review/Changes). This additional requirement ensures that the SWMP provisions reflect current site conditions. See Part LB.2(c) of the permit. PART lI Permit - Page 25 Permit No. COR -030000 11. CHANGES IN THIS GENERAL PERMIT (cont.) I. Stormwater Management Plan (SWMP) - Contents The SWMP Contents section has been modified. Some of the changes are limited to organization of information, which does not require modification of an existing permittee's current SWMP. Most of the SWMP changes involve either clarifications, reformatting, or taking recommendations from the Division's SWMP guide and making them permit requirements (e.g., vehicle tracking controls, BMP installation specifications). If an existing permittee (Le., those with permit coverage before June 30, 2007) followed the recommendations in the SWMP guide (Appendix A of the permit application), then their SWMP will presumably meet the new requirements. However, for any existing permittees who did not follow the applicable SWMP guide recommendations, their SMWP must be amended to include the new required items: -SWMP Administrator -Identification of potential pollutant sources -Best Management Practices descriptions and installation specifications, including dedicated concrete or asphalt batch plants; vehicle tracking control; and waste management and disposal (including concrete washout activities). For existing permittees, any SWMP changes based on the change in permit requirements must be completed by October 1, 2007. The plan is not to be submitted to the Division unless requested, but must be available on site as outlined in Part I.D.5(b) of the permit. The BMP requirement clarifications included in this renewed permit in no way imply that adequate BMPs to address all pollutant sources at a permitted site were not required in previous permits. The revised requirements are intended only to better clarify SWMP content requirements and provide improved direction to permittees. The SWMP changes are listed below. All new applicants (after June 30, 2007) for permit coverage for their sites must fully comply with the new SWMP organization, plan requirements, and implementation. 1. Site Description: The requirement to provide an estimate of the run-off coefficient has been removed. The run-off coefficient as currently utilized in the SWMP may not contribute sufficiently to permit compliance to juste the effort in determining accurate values. See Part I. C.1 of the permit. However, the Division still encourages use of the coefficient as needed to adequately evaluate site-specific BMP selection and design criteria (e.g., pond capacities, BMP location, etc.) See Section C.2 of the SWMP guidance (Appendix A of the permit application). 2. Site Map: The requirement to identify boundaries of the 100 year flood plain has been removed. The boundaries as currently utilized in the SWMP may not contribute sufficiently to permit compliance to juste the effort in determining their location. See Part I. C.2 of the permit. 3. Stormwater Management Controls: This section has been modified to require identification of a SWMP Administrator and all potential pollutants sources in the SWMP. See Part 1.C.3 of the permit. a) The SWMP Administrator is a specific individual(s), position or title who is responsible for the process of developing, implementing, maintaining, and revising the SWMP. This individual serves as the comprehensive point of contact for all aspects of the facility's SWMP. This requirement may necessitate changes to existing permittees' SWMPs. PART 11 Permit - Page 26 Permit No. COR -030000 11. CHANGES IN THIS GENERAL PERMIT (cont.) b) The requirement to identify Potential Pollutant Sources has been expanded to include more details for the evaluation of such sources. This evaluation allows for the appropriate selection of BMPs for implementation at a facility or site. Additionally, this section was added to be consistent with the SWMP guide. This requirement may necessitate changes to existing permittees' SWMPs. c) Best Management Practices (BMPs) for Stormwater Pollution Prevention: This section was modified to require the following items to be addressed in the SWMP. These requirements may necessitate changes to existing permittees' SWMPs. This section also requires that the SWMP provide installation and implementation specifications for each BMP identified in the SWMP. For structural BMPs, in most cases, this must include a technical drawing to provide adequate installation specifications. See Part 1. C.3(c). i) Dedicated concrete or asphalt batch plants. This section requires that the practices used to reduce the pollutants in stormwater discharges associated with dedicated concrete or asphalt batch plants be identified in the SWMP. (Coverage under the construction site SWMP and permit is not required for batch plants if they have alternate CDPS permit coverage.) Vehicle tracking control. This section requires that practices be implemented to control sediment from vehicle tracking, and that all such practices implemented at the site be clearly described in the SWMP. iii) Waste management and disposal. This section requires that the practices implemented at the site to control stormwater pollution from construction site waste, including concrete washout activities, be clearly described in the SWMP. It also requires that concrete washout activities be conducted in a manner that does not contribute pollutants to surface waters or stormwater runoff iv) Concrete Washout Water. Part I.D.3(c) of the permit has been revised to conditionally authorize discharges to the ground of concrete wash water from washing of tools and concrete mixer chutes when appropriate BMPs are implemented. The permit prohibits the discharge of concrete washout water to surface waters and to storm sewer systems. Part I.C.3(c)(7) of the permit requires that BMPs be in place to prevent surface discharges of concrete washout water from the site. The use of unlined pits to contain concrete washout water is a common practice in Colorado. The Division has further evaluated the need for a permit for discharge of concrete washout water to the ground. The Division has determined that the use of appropriate BMPs for on-site washing of tools and concrete mixer chutes would prevent any significant discharge to groundwater. BMPs to protect groundwater are required by Part I.C.3(c)(7) of the permit. Because pH is a pollutant of concern for washout activities, the soil must have adequate buffering capacity to result in protection of the groundwater standard, or a liner/containment must be used. The following management practices are recommended to prevent an impact from unlined pits to groundwater: (1) the use of the washout site should be temporary (less than 1 year), and (2) the washout site should be not be located in an area where shallow groundwater may be present, such as near natural drainages, springs, or wetlands. PART II Permit - Page 27 Permit No. COR -030000 II. CHANGES IN THIS GENERAL PERMIT (cont.) Where adequate management practices are not followed to protect groundwater quality, the Department may require discharges to unlined pits to cease, or require the entity to obtain alternate regulatory approval through notice from either the Water Quality Control Division or the Hazardous Materials and Waste Management Division. In addition, Part 1.D.1(b) of the permit has been revised to clearly state that the permit does not authorize on-site permanent disposal of concrete washout waste, only temporary containment of concrete washout water from washing of tools and concrete mixer chutes. Upon termination of use of the washout site, accumulated solid waste, including concrete waste and any contaminated soils, must be removed from the site to prevent on-site disposal of solid waste. Construction Dewatering. Part LD.3(d) of the permit has been revised to conditionally authorize discharges to the ground of water from construction dewatering activities when appropriate BMPs are implemented. The permit does not authorize the discharge of groundwater from construction dewatering to surface waters or to storm sewer systems. Part I.C.3(c)(8) of the permit requires that BMPs be in place to prevent surface discharges. The permittee may apply for coverage under a separate CDPS discharge permit, such as the Construction Dewatering general permit, if there is a potential for discharges to surface waters. The Division has determined that potential pollutant sources introduced into groundwater from construction dewatering operations do not have a reasonable potential to result in exceedance of groundwater standards when the discharge is to the ground. The primary pollutant of concern in uncontaminated groundwater is sediment. Although technology- based standards for sediment do exist in 5 CCR 1002-41, the discharge of sediment to the ground as part of construction dewatering does not have the reasonable potential to result in transport of sediment to the groundwater table so as to result in an exceedance of those standards. For a discharge of water contaminated with other pollutants that are present in concentrations that may cause an exceedance of groundwater standards, separate CDPS discharge permit coverage is required. Contaminated groundwater may include that contaminated with pollutants from a landfill, mining activity, industrial pollutant plume, underground storage tank, or other source of human -induced groundwater pollution and exceeding the State groundwater standards in Regulations 5 CCR 1002-41 and 42. J. Terms and Conditions, General Limitations and Design Standards This section reiterates the requirement that facilities select, install, implement, and maintain appropriate BMPs, following good engineering, hydrologic and pollution control practices. In addition, requirements for protection of water quality standards (see Part I.D.1.(a) of the permit) and requirements to adequately design BMPs to prevent pollution or degradation of State waters (see Part 1.D.2 oldie permit) have been revised and are fully discussed in Part 111.8 of the rationale. below. Additional language was also added to Section 111. B of the rationale further clarifying the expectations, for compliance with this permit. 1. Management of Site Waste This section has been modified to clarify that on-site waste must be properly managed to prevent potential pollution of State waters, and that this permit does not authorize on-site waste disposal. Solid waste disposal is regulated by the Hazardous Materials and Waste Management Division. PART II Permit - Page 28 Permit No. COR -030000 1I. CHANGES IN THIS GENERAL PERMIT (cont.) K. Terms and Conditions, SWMP Requirements 1. SWMP Review/Changes: This section now requires that when changes are made to site conditions, the SWMP must be revised immediately, except for some BMP description changes which conditionally may occur within 72 hours. This requirement is included to both ensure that the SWMP be kept accurate and up-to-date, and to clarify that stormwater management at a site typically should be proactive instead of responsive, and be integrated into site management to ensure it is calibrated with those changes. The section was also clarified to state that only changes in site conditions that do not require new or modified BMPs do not need to be addressed in the SWMP. See Part L D. 5(c) of the permit. SWMP Certification; The previous permit was unclear on a requirement that the copy of SWMP that remains at the facility had to be signed in accordance with permit signatory requirements. This requirement has been deleted. The signatory requirement of Part LF. I only applies to the SWMP fit is to be submitted to the Division or to EPA. See Part LF. 1 of the permit. L. Terms and Conditions, Post -Storm Inspections The previous permit required post -storm inspections, but did not specify the timing of inspections. This section now requires that post -storm event inspections generally be conducted within 24 hours of the event. An alternative timeline has been allowed, only for sites where there are no construction activities occurring following a storm event. For this condition, post -storm event inspections shall instead be conducted prior to commencing construction activities, but no later than 72 hours following the storm event, and the delay noted in the inspection report. Any exception from the minimum inspection schedule is temporary, and does not eliminate the requirement to perform routine maintenance due to the effects of a storm event, including maintaining vehicle tracking controls and removing sediment from impervious areas. In many cases, maintenance needs will require a more frequent inspection schedule than the minimum inspections required in the permit, to ensure that BMPs continue to operate as needed to comply with the permit. See Part 1.D.6(a) of the permit. M Terms and Conditions, Inspections 1. The Winter Conditions Inspection Exclusion section has been modified to include documentation requirements for this exclusion. See Part ID.6(a) of the permit. The Inspection Scope has been modified to include the requirement to inspect waste storage areas during inspections conducted in accordance with the permit. See Part I.D. 6(b) of the permit. 2. The requirements for sites to qualify for reduced inspection frequencies for completed sites have been slightly modified (see Part 1.D.6(a)(2) of the permit,). The requirement now is that only construction activities that disturb the ground surface must be completed. Construction activities that can be conducted without disturbance of the ground surface; for example, interior building construction, and some oil well activities, would not prohibit a site from otherwise qualifying for the reduced inspection frequency. In addition, the requirement for the site to be prepared for final stabilization has been slightly modified to allow for sites that have not yet been seeded to qualify, as long as the site has otherwise been prepared for final stabilization, including completion of appropriate soil preparation, amendments and stabilization practice. This will allow for sites with seasonal seeding limitations or where additional seed application may be needed in the future to still qualify. PART II Permit - Page 29 Permit No. COR -030000 II. CHANGES IN THIS GENERAL PERMIT (cont.) 3. The Inspection Report/Records section (Part I.D.6(b)(2)) was added to clarify requirements for inspection reports generated during an inspection conducted in accordance with Part I.D.6 of the permit. Inspection reports must be signed by the inspector, or the individual verifying the corrective action indicated in the inspection report, on behalf of the permittee. Inspection reports are not typically required to be submitted to the Division, and therefore, are not required to be signed and certified for accuracy in accordance with Part IF. 1 of the permit. However, any inspection reports that are submitted to the Division must follow the signatory requirements contained in that section. N. Terms and Conditions, Maintenance, Repair, and Replacement of Control Practices These sections have been added to clarify requirements for maintaining the BMPs identified in the SWMP and for addressing ineffective or failed BMPs. BMP maintenance and site assessment to determine the overall adequacy of stormwater quality management at the site must occur proactively, in order to ensure adequate control of pollutant sources at the site. In most cases, if BMPs are already not operating effectively, or have failed, the issue must be addressed immediately, to prevent discharge of pollutants. See Parts I.D. 7 and LD.8 of the permit. 0. Total Maximum Daily Load (TMDL) A section on TMDLs has been added. This section gives a general outline of the additional requirements that may he imposed by the Division if the facility discharges to a waterbody for which a stormwater-related TMDL is in place. See Section VIII. C of the rationale and Part LD.11 of the permit. P. Additional Definitions Q. Part L E of the permit has been modified to remove the definition of runoff coefficient, as it is no longer a permit requirement. The definition for state waters has also been deleted, but can be found in Regulation 61. Changes in Discharge The section on the types of discharge or facility changes that necessitate Division notification has been clarified. See Part II.A.1 of the permit. R. Non -Compliance Notification The section on notification to the Division regarding instances of non-compliance has beenamended to clam which types of noncompliance require notification. See Part II.A.3 of the permit. S. Short Term Certifications The previous permit allowed small short-term construction activities to be authorized for a predetermined period from 3 to 12 months, and then automatically expire (an inactivation request did not need to be submitted). The issuance of these certifications has led to significant confusion and incidents of noncompliance resulting from permittees unintentionally letting their certifications expire prior to final stabilization, as well as issues regarding billing. Therefore, the provisions for short-term certifications have been deleted. T. Bypass The Division has revised the Bypass conditions in Part II.A.5 of the permit to be consistent with the requirements of Regulation 61.8(3)(i). The revised language addresses under what rare occurrences BMPs may be bypassed at a site. PART II Permit - Page 30 Permit No. COR -030000 11I. BACKGROUND As required under the Clean Water Act amendments of 1987, the Environmental Protection Agency (EPA) has established a framework for regulating municipal and industrial stormwater discharges. This framework is under the National Pollutant Discharge Elimination System (NPDES) program (Note: The Colorado program is referred to as the Colorado Discharge Permit System, or CDPS, instead of NPDES.) The Water Quality Control Division ("the Division') has stormwater regulations (5CCR 1002-61) in place. These regulations require specific types of industrial facilities that discharge stormwater associated with industrial activity (industrial stormwater), to obtain a CDPS permit for such discharge. The regulations specifically include construction activities that disturb one acre of land or more as industrial facilities. Construction activities that are part of a larger common plan of development which disturb one acre or more over a period of time are also included. A. General Permits The Division has determined that the use of general permits is the appropriate procedure for handling most of the thousands of industrial stormwater applications within the State. B. Permit Requirements This permit does not impose numeric effluent limits or require submission of effluent monitoring data in the permit application or in the perrnit itselfThe permit instead imposes practice -based effluent limitations for stormwater discharges through the requirement to develop and implement a Stormwater Management Plan (SWMP). The narrative permit requirements include prohibitions against discharges of non-stormwater (e.g., process water). See Part LD.3 of the permit. The permit conditions for the SWMP include the requirement for dischargers to select, implement and maintain Best Management Practices (BMPs) at a permitted construction site that adequately minimize pollutants in the discharges to assure compliance with the terms and conditions of the permit. Part 1. D.2 of the permit includes basic design standards for BMPs implemented at the site. Facilities must select, install, implement, and maintain appropriate BMPs, following good engineering, hydrologic and pollution control practices. BMPs implemented at the site must be adequately designed to control all potential pollutant sources associated with construction activity to prevent pollution or degradation of State waters. Pollution is defined in CDPS regulations (5CCR 1002-61) as man-made or man -induced, or natural alteration of the physical, chemical, biological, and radiological integrity of water. Utilizing industry -accepted standards for BMP selection that are appropriate for the conditions and pollutant sources present will typically be adequate to meet these criteria, since construction BMPs are intended to prevent the discharge, of all but minimal amounts of sediment or other pollutants that would not result in actual pollution of State waters, as defined above. However, site-specific design, including ongoing assessment of BMPs and pollutant sources, is necessary to ensure that BMPs operate as intended. The permit further requires that stormwater discharges from construction activities shall not cause, have the reasonable potential to cause, or measurably contribute to an excursion above any water quality standard, including narrative standards for water quality. This condition is the basis for all CDPS Discharge permits, and addresses the need to ensure that waters of the State maintain adequate water quality, in accordance with water quality standards, to continue to meet their designated uses. It is believed that, in most cases, BMPs can be adequate to meet applicable water quality standards. If water quality impacts are noted, or the Division otherwise determines that additional permit requirements are necessary, they are typically imposed as follows: 1) at the renewal of this general permit or through a general permit specific to an industrial sector (f the issue is sector -based); 2) through direction from the Division based on the implementation of a TMDL (if the issue is watershed -based); or 3) if the issue is site-specific, through a revision to the certification from the Division based on an inspection or SWMP review, or through an individual permit. PART II Permit - Page 31 Permit No. COR -030000 111. BACKGROUND (cont.) Some construction sites may be required to comply with a Qualifying Local Program in place of meeting several of the specific requirements in this permit. Sites covered by a Qualifying Local Program may not be required to submit an application for coverage or a notice of inactivation and may not be required to pay the Division's annual fee. See Section VII of the rationale. C. Violations/Penalties Dischargers of stormwater associated with industrial activity, as defined in the CDPS regulations (5CCR 1002-61), that do not obtain coverage under this or other Colorado general permits, or under an individual CDPS permit regulating industrial stormwater, will be in violation of the Federal Clean Water Act and the Colorado Water Quality Control Act, 25-8-101. For facilities covered under a CDPS permit, failure to comply with any CDPS permit requirement constitutes a violation. As of the time of permit issuance, civil penalties for violations of the Act or CDPS permit requirements 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. IV. STORMWATER DISCHARGES ASSOCIATED WITH CONSTRUCTION ACTIVITY The stormwater regulations (CDPS regulations (5CCR 1002-61)), require that stormwater discharges associated with certain industrial activities be covered under the permit program. Construction activity that disturbs one acre or more during the life of the project is specifically included in the listed industrial activities. This permit is intended to cover most stormwater discharges from construction facilities required by State regulation to obtain a permit. A. Construction Activity Construction activity includes ground surface disturbing activities including, but not limited to, clearing, grading, excavation, demolition, installation of new or improved haul and access roads, staging areas, stockpiling ofjill materials, and dedicated borrow/fill areas. Construction does not include routine maintenance to maintain original line and grade, hydraulic capacity, or original purpose of the facility. (The maintenance exclusion is intended for projects such as road resurfacing, and where there will be less than one acre of additional ground disturbed. Improvements or upgrades to existing facilities or roads, where at least one acre is disturbed, would not qual as "routine maintenance.') Definitions of additional terms can be found in Part LE of the permit. Stormwater discharges from all construction activity require permit coverage, except for operations that result in the disturbance of less than one acre of total land area and which are not part of a larger common plan of development or sale. A "larger common plan of development or sale" is a contiguous area where multiple separate and distinct construction activities may be taking place at different times on different schedules. B. Types of Discharges/Activities Covered 1. Storntwater: This permit is intended to cover most new or existing discharges composed entirely of stormwater from construction activities that are required by State regulation to obtain a permit. This includes stormwater discharges associated with areas that are dedicated to producing earthen materials, such as soils, sand, and gravel, for use at a single construction site. These areas may be located at the construction site or at some other location. This permit does not authorize the discharge of mine water or process water from borrow areas. This permit may also cover stormwater discharges associated with dedicated asphalt plants and concrete plants located at a specific construction site. PART 11 Permit - Page 32 Permit No. COR -030000 IV. STORMWATER DISCHARGES ASSOCIATED WITH CONSTRUCTION ACTIVITY (cont.) 2. Process water: Under certain restrictions, discharges to the ground from construction dewatering, and from concrete washout activities, are also covered (see Parts 1.C.3(c)(7), 1.C.3(c)(8), I.D.3(c) and 1.D.3(d) of the permit). C. Types of Activities NOT Covered I. Stormwater: Aside from the sources listed in subparagraph B.1, above, this permit does not cover stormwater discharged frorn construction sites that is mixed with stormwater from other types of industrial activities, or process water of any kind. Other types of industrial activities that require stormwater discharge permits pursuant to different sections of the regulations (Regulation 5 CCR 1002-61, Section 61.2(e)(iii)(A-1, K)J, are not covered by this permit. 2. Process water: This permit also does not cover any discharge of process water to surface waters. If the construction activity encounters groundwater, in order to discharge this groundwater to surface waters, a Construction Dewatering Discharge Permit (permit number COG -070000) must also be obtained. An application for this permit can be obtained from the Division at the address listed in Part LA.4(a) of the permit, or at the website in Section 1 of the rationale. V. COVERAGE UNDER THIS GENERAL PERMIT Under this general permit, owners or operators of stormwater discharges associated with construction activity may be granted authorization to discharge stormwater into waters of the State of Colorado. This includes stormwater discharges associated with industrial activity from areas that are dedicated to producing earthen materials, such as soils, sand and gravel, for use at a single construction site, and dedicated asphalt plants and dedicated concrete plants. This permit does not pre-empt or supersede the authority of other local, state or federal agencies to prohibit, restrict or control discharges of stormwater to storm dram systems or other water courses within their jurisdiction. Authorization to discharge under the permit requires submittal of a completed application form and a certification that the SWMP is complete, unless the site is covered by a Qualifying Local Program. Upon receipt alai' required information, the Division may allow or disallow coverage under the general permit. VI. APPLICATION AND CERTIFICATION At least ten days prior to the commencement of construction activities, the owner or operator of the construction site shall submit an original completed application which includes the signed certification that the SWMP is complete. Original signatures are required for the application to be considered complete. For small construction sites only, if the site is covered by a Qualifying Local Program (see below), submittal of an application is not required. For the purposes of this permit, the "operator" is the person who has day-to-day control over the project. This can be the owner, the developer, the general contractor or the agent of one of these parties, in some circumstances. At different times during a construction project, different types of parties may satisfy the definition of "operator" and the certification may be transferred as roles change. (Note - Under the Federal regulations, this application process is referred to as a Notice of Intent, or NOL For internal consistency with its current program, the Division will continue to use the term "application. ") A summary of the permit application requirements is found in the permit at Part i.A.4(b). If coverage under this general permit is appropriate, then a certification will be developed and the applicant will be certified under this general permit. PART 11 Permit - Page 33 Permit No. COR -030000 VIl. QUALIFYING LOCAL PROGRAMS For stormwater discharges associated with small construction activity (Le., one to five acre disturbed area sites), the permit includes conditions that incorporate approved qualfMng 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. The requirements for Qualifying Local Programs are outlined in Part 61.8(12) of the Colorado Discharger Permit System Regulations (also see the Division's "Qualifying Local Programs for Small Construction Sites - Application Guidance'). Such programs must impose requirements to protect water quality that are at least as stringent as those required in this permit. A. Approval Termination A Qualifting Local Program may be terminated by either the Division or the municipality. Upon termination of Division approval ofa Qualifying Local Program, any small construction activity required to obtain permit coverage under Section 61.3(2)(h) of the CDPS regulations (5CCR 1002-61), shall submit an application form as provided by the Division, with a certification that the Stormwater Management Plan (SWMP) is complete as required by Part LA. 3 of the permit, within 30 days of Division notification. B. Approval Expiration Division approval ofa Qualifying Local Program will expire with this general permit on June 30, 2012, Any municipality desiring to continue Division approval of their program must reapply by March 31, 2012. The Division will determine if the program may continue as a approved Qualifying Local Program. VIII. TERMS AND CONDITIONS OF PERMIT A. Coverage under a Qualifying Local Program - For Small Construction Sites Only For small construction sites (disturbing less than 5 acres) covered under a Qualing Local Program (see Section VII above), only certain permit requirements apply, as outlined below. The local program must have been formally designated by the Division to qualms. Most municipalities have some type of local program and may require permits and fees, However, simply having a program in place does not necessarily mean that it is a qual ming program and that a State permit is not required. The local municipality is responsible for noting operators and/or owners that they are covered by a Qualifying Local Program. As of May 31, 2007, the only approved Qualifying Local Programs within the state are for Golden, Durango and Lakewood. An updated list of municipalities with Qualifying Local Programs, including contact information, is available on the Division's website at: http://►vwi1 cclphe..state.co.us/wq/PermitsUnit/Slormwater/construction.htrnl. The Division reserves the right to require any construction 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. 1. Permit Coverage: If a construction site is within the jurisdiction ofa Qualifying Local Program, the owner or 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. The permittee also is not required to submit an inactivation notice or payment of an annual fee to the Division, PART 11 Permit - Page 34 Permit No. COR -030000 VIII. TERMS AND CONDITIONS OF PERMIT (cont.) 2. Permit Terms and Conditions: The permittee covered by a Qualifying Local Program must comply with the requirements of that Qual ding Local Program. In addition, the following permit sections are applicable: a) Parts I.A.1, I.A.2, and 1.A.3: Authorization to discharge and discussion of coverage under the permit. b) Part I.D. I: General limitations that must be met in addition to local requirements. c) Parts I.D.2, 1.D.3, I.D.4: BMP implementation, prohibition of non-stormwater discharges unless addressed in a separate CDPS permit, and requirements related to releases of reportable quantities. d) Part LD.11: Potential coverage under a Total Maximum Daily Load (TMDL). e) Part I.E: Additional definitions. f) Part II (except for Parts 11.A.1, ILB.3, ILB.8, and II.B.10): Specifically includes, but is not limited to, provisions applicable in the case of noncompliance with permit requirements, and requirements to provide information and access. B. Stormwater Management Plans (SWMPs) Prior to commencement of construction, a stormwater management plan (SWMP) shall be developed and implemented for each facility covered by this permit. A certification that the SWMP is complete must be submitted with the permit application. The SWMP shall identjfit 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 the Best Management Practices (BMPs) which will be used to reduce the pollutants in stormwater discharges from the construction site. (Note that permanent stormwater controls, such as ponds, that are used as temporary construction BMPs must be adequately covered in the SWMP.) Facilities must implement the provisions of their SWMP as a condition of this permit. The SWMP shall include the following items: I. Site Description 2. Site Map 3. Stormwater Management Controls 4. Long-term Stormwater Management 5. Inspection and Maintenance (See Parts I.B. and I.0 of the permit for a more detailed description of SWMP requirements) The Division has a guidance document available on preparing a SWMP. The document is included as Appendix A of the permit application, and is available an the Division's website at www.cdphe.state.co.uv v grPermit 1. nit. Some changes have been made to the SWMP requirements. See Section 11.1 of the rationale for a discussion on permittee responsibilities regarding those changes. PART 11 Permit - Page 35 Permit No. COR -030000 VIII. TERMS AND CONDITIONS OF PERMIT (cont.) Master SWMP Often, a large construction project will involve multiple smaller construction sites that are within a common plan of development, or multiple well pads under construction within an oil and gas well field Pollutant sources and the types of BMPs used can be relatively consistent in such cases. A permittee could significantly streamline the SWMP development process through the use of a master SWMP. SWMP information must be developed and maintained for all construction activities that exceed one acre (or are part of a common plan of development exceeding one acre) conducted within the permitted area. By developing a single master plan, the permittee can eliminate the need to develop repetitive information in separate plans. Such a plan could include two sections, one containing a reference section with information applicable to all sites (e.g., installation details and maintenance requirements for many standard BMPs, such as silt fence and erosion blankets), and the second containing all of the information specific to each site (e.g., site BMP map, drainage plans, details for BMPs requiring site specific design, such as retention ponds). As new activities begin, information required in the SWMP is added to the plan, and as areas become finally stabilized, the related information is removed. Records of information related to areas that have been finally stabilized that are removed from the active plan must be maintained for a period of at least three years from the date that the associated site is finally stabilized. C. Total Maximum Daily Load (TMDL) If the designated use of a stream or water body has been impaired by the presence of a pollutant(.),. development of a Total Maximum Daily Load (TMDL) may be required. A TMDL is an estimate of allowable loading in the waterbody for the pollutant in question. Types of discharges that are or have the potential to be a significant source of the pollutant are also identified. If a TMDL has been approved for any waterbody into which the permittee discharges, and stormwater discharges associated with construction activity have been assigned a pollutant -specific Wasteload Allocation (WLA) under the TMDL, the Division will either: 1. Notify the permittee of the TMDL, and amend the permittee's certification to add specific BMPs and/or other requirements, as appropriate; or 2. Ensure that the TMDL is being implemented properly through alternative local requirements, such as by a municipal stormwater permit. (The only current example of this is the Cherry Creek Reservoir Control Regulation (72.0), which mandates that municipalities within the basin require specific BMPs for construction sites.) See Part LD.11 of the permit for further information. D. Monitoring Sampling and testing of stormwater for specific parameters is not required on a routine basis under this permit. However, 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. See Part I.D.1(e) of the permit. E. Facility Inspections Construction sites typically must inspect their stormwater management controls at least every 14 days and within 24 hours after the end of any precipitation or snowmelt event that causes surface erosion. At sites or portions of sites where ground -disturbing construction has been completed but a vegetative cover has not been established, these inspections must occur at least once per month. (At sites where persistent snow cover conditions exist, inspections are not required during the period that melting conditions do not exist. These PART 11 Permit - Page 36 Permit No. COR -030000 VIII. TERMS AND CONDITIONS OF PERMIT (cont.) conditions are only expected to occur at high elevations within the Colorado mountains.) For all of these inspections, records must be kept on file. Exceptions to the inspection requirements are detailed in Part I.D.6 of the permit. F. SWMP Revisions The permittee shall amend the SWMP whenever there is a change in design, construction, operation, or maintenance of the site, which would require the implementation of new or revised BMPs. The SWMP shall also be amended if it proves to be ineffective in achieving the general objectives of controlling pollutants in stormwater discharges associated with construction activity. The timing for completion of SWMP changes is detailed in Parts I D.5(c) and I D.5(d) of the permit. SWMP revisions shall be made prior to change in the field, or in accordance with Part 1.D.5(d) of the permit. G. Reporting The inspection record shall be made available to the Division upon request. Regular submittal of an annual report is not required in this permit. See Part I.D, 9 of the permit. 11. Annual Fee The permittee is required to submit payment of an annual fee as set forth in the Water Quality Control Act. Permittees will be billed for the initial permit fee within a few weeks of permit issuance and then annually, based on a July 1 through June 30 billing cycle. I. Responsibility for Permit The permit certification for a site may be inactivated, once coverage is no longer needed. The certification may be transferred, if another party is assuming responsibility for the entire area covered by the certification. In addition, permit responsibility for part of the area covered by the certification may be reassigned to another party. These actions are summarized below. The Stormwater Program construction fact sheet explains these actions in further detail under the section on Multiple Owner/Developer Sites, and is available on the Division website at http:// • i w.cclphe.state.co.u.s/wq/PermitsUnit/.torr,,+crier/ConstFactSheet.PDF, Section F. 1. Inactivation Notice: When a site has been finally stabilized in accordance with the SWMP, the permittee shall submit an Inactivation Notice that is signed in accordance with Part 1.F. 1 of the permit. A summary of the Inactivation Notice content is described in Part 1.4.6 of the perrnit. A copy of the Inactivation Notice form will be mailed to the permittee along with the permit certification, Additional copies are available from the Division. For sites where all areas have been removed from permit coverage, the permittee may submit an inactivation notice and terminate permit coverage. In such cases the permittee would no longer have any land covered under their permit certification, and therefore there would be no areas remaining to finally stabilize. Areas may be removed from permit coverage by: -reassignment of permit coverage (Part 1.4.8 of the permit); -sale to homeowner(s) (Part LA.9 of the permit); or -amendment by the permittee, in accordance with Division guidance for areas where permit coverage has been obtained by a new operator or returned to agricultural use. PART 11 Permit - Page 37 Permit No. COR -030000 Ylll. TERMS AND CONDITIONS OF PERMIT (cont.) 2. Transfer of Permit: When responsibility for stormwater discharges for an entire construction site changes from one individual to another, the permit shall be transferred in accordance with Part I.A.7 of the permit. The permittee shall submit a completed Notice of Transfer form, which is available from the Division, and at tcww.cdphe.state.co.us/wq/PermitsUnit. 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 owner or operator would be required to obtain permit coverage separately. 3. Reassignment of Permit: When a permittee no longer has control of a specific portion of a permitted site, and wishes to transfer coverage of that portion of the site to a second party, the permittee shall submit a completed Notice of Reassignment of Permit Coverage form, which is available from the Division, and at www.cdphe.state.co.us/wq/PermitsUnii. The form requires that both the existing permittee and new permittee complete their respective sections. See Part LA.8 of the permit. Duration of Permit The general permit will expire on June 30, 2012. The permittee's authority to discharge under this permit is approved until the expiration date of the general permit. Any permittee desiring continued coverage under the general permit past the expiration date must apply for recertification under the general permit at least 90 days prior to its expiration date. Kathleen Rosow December 18, 2006 IX PUBLIC NOTICE 12/22/06 The permit was sent to public notice on December 22, 2006. A public meeting was requested, and was held on February 2, 2007. Numerous comments were received on the draft permit. Responses to those comments, and a summary of changes made to the draft permit, are in a separate document entitled "Division Response To Public Comments." The permit will be sent to a second public notice on March 23, 2007. Any changes resulting from the second public notice will be summarized in the rationale. Kathleen Rosow March 22, 2007 X PUBLIC NOTICE — 3/23/07 The permit was sent to public notice for a second time on March 23, 2007. Numerous comments were received on the second draft permit. Responses to those comments, and a summary of the additional changes made to the draft permit, are contained in a separate document entitled "Division Response To Public Comments Part II". This document is part of the rationale. Any changes based on the Division response are incorporated into the rationale and permit. The response document is available online at http:/1w ww.cdvhe.state.co.ars/wq/PerinitsUnit/.storm►.heifer/construction.html, or by emailing cdphe.wustorm(ustate.co.crs, or by calling the Division at 303-692-3517. Kathleen Rosow May 31. 2007 Appendix C Storm Water Inspection Form Storm Water Inspection Checklist Project Name Project ID Unique ID Field Name Site Type Permit Name Permit Date Proposed Start Date Latitude Longitude Township Range Section Description Weather Related Factors Storm Start Date: Storm End Date: Winter Exclusion Inspection Date Inspector Inspection Type Signature Comment 1 Weather Related Factors Storm Start Date: Storm End Date: Winter Exclusion Acres Disturbed Acres Subject to Interim Reclamation Acres Restored Distance to Receiving Water Name of Receiving Water(s) Type Date of Maintenance or Installation Completion Comment 1 Best Management Practices B M P # Type Maintenance Required Date of Maintenance or Installation Completion Comment 1 2 3 4 5 6 7 8 9 10 11 12 13 14 House Keeping/ Site Debris None Spill or Leak (circle) Yes (give location and description): Seed Mix Date Planted 70% Revegetated Comment Site complies with the CDPS General Permit COR -03000 in accordance with the permit requirements and conditions. Please give a brief description of non-compliance. YES: *NO: Comments/Descriptions of any corrective actions: Weather: Reviewed by: Appendix D BMP Installation Details Check Danis Description and Purpose A check dam is a small barrier constructed of rock, gravel bags, sandbags, straw bales, fiber rolls, or reusable products, placed across a constructed swale or drainage ditch. Check dams reduce the effective slope of the channel, thereby reducing the velocity of flowing water, allowing sediment to settle and reducing erosion. Implementation General Check dams reduce the effective slope and create small pools in swales and ditches that drain 10 a cres or less. Reduced slopes reduce the velocity of storm water flow, thus reducing erosion of the swale or ditch and promoting sedimentation. The use of check dams for sedimentation will likely result in little net removal of sediment because of the small detention time and probable scour during longer storms. Using a series of check dams will generally increase their effectiveness. A sediment trap may be placed immediately upstream of the check dam to increase sediment removal efficiency. Design and Layout Check dams work by decreasing the effective slope in ditches and swales. An important consequence of the reduced slope is a reduction in capacity of the ditch or swale. This reduction in capacity must be considered when using this BMP, as reduced capacity can result in overtopping of the ditch or swale and resultant consequences. In some cases, such as a "p ermanent" ditch or swale being constructed early and used as a "temporary" conveyance for construction flows, the ditch or swale may have sufficient capacity such that the temporary reduction in capacity due to check dams is acceptable. When check dams reduce capacity beyond acceptable limits, there are several options: • Consider alternative BMPs. • Increase the size of the ditch or swale to restore capacity. Maximum slope and velocity reduction is achieved when the toe of the upstream dam is at the same elevation as the top of the downstream dam. The center section of the dam should be lower than the edge sections so that the check dam will direct flows to the center of the ditch or swale. D1 Check dams are usually constructed of rock, gravel bags, sandbags, and fiber rolls. A number of products manufactured specifically for use as check dams are also being used, and some of these products can be removed and reused. C heck dams can also be constructed of logs or lumber, and have the advantage of a longer lifespan when compared to gravel bags, sandbags, and fiber rolls. Straw bales can also be used for check dams and can work if correctly installed; but in practice, straw bale check dams have a high failure rate. Check dams should not be constructed from straw bales or silt fences, since concentrated flows quickly wash out these materials. Rock check dams are usually constructed of 8 to 12 in. rock. The rock is placed either by hand or mechanically, but never just dumped into the channel. The dam must completely span the ditch or swale to prevent washout. The rock used must be large enough to stay in place given the expected design flow through the channel Log check dams are usually constructed of 4 to 6 in. diameter logs. The logs should be embedded into the soil at least 18 in. Logs can be bolted or wired to vertical support logs that have been driven or buried into the soil. Gravel bag and sandbag check dams are constructed by stacking bags across the ditch or swale, shaped as shown in the drawings at the end of this fact sheet. Manufactured products should be installed in accordance with the manufacturer's instructions. If grass is planted to stabilize the ditch or swale, the check dam should be removed when the grass has matured (unless the slope of the swales is greater than 4%). Refer to drawing detail and the end of this section. The following guidance should be followed for the design and layout of check dams: • Install the first check dam approximately 16 ft from the outfall device and at regular intervals based on slope gradient and soil type. • Check dams should be placed at a distance and height to allow small pools to form between each check dam. • Backwater from a downstream check dam should reach the toes of the upstream check dam. • A sediment trap provided immediately upstream of the check dam will help capture sediment. D ue to the potential for this sediment to be re -suspended in subsequent storms, the sediment trap must be cleaned following each storm event. • High flows (typically a 2 -year storm or larger) should safely flow over the check dam without an increase in upstream flooding or damage to the check dam. • Where grass is used to line ditches, check dams should be removed when grass has matured sufficiently to protect the ditch or swale. • Gravel bags may be used as check dams with the following specifications: Materials Gravel bags used for check dams should conform to the requirements of gravel bag berms. S andbags used for check dams should conform to sandbag barrier guidelines. D2 Fiber rolls used for check dams should conform to fiber roll requirements. S traw bales used for check dams should conform to straw bale barrier requirements. SECTION r_Ax $TAKIke ANO LASMNC DETAIL :4.7" •r+ 7 . L VAT ICM NOTCIa DETAIL PCASP[CTw TEMPORARY CHECK DAM (TYPE 0 vw.1 .em. IYJTE sa..a .rmomir aver w En. 4.4, [ME ±.ens ro. TEMPORAR• CHECK DAW (TYPE 21 PEISPECTE4 TEMPORARY CHECK DAM !TYPE 2) ELEVATION 200 mm to 300 mm dlometer rock Flow J 1414 0. At•�y�Ry o!�1010106 So•ibr. *It ewe- "Pew spa wsr,"" � . 'SJ 0.1 m to 1m Mm TYPICAL ROCK CHECK DAM SECTION ROCK CHECK DAM NOT TO SCALE D3 E Culvert Inlet/Outlet Protection a. Normal metal culvert installation using riprap around the inlet and outlet of culverts. Also use geotextile (filter fabric) or gravel filter beneath the riprap for most installations. (Adapted from Wisconsin's Forestry Best Management Practice for Water Quality, 1995) Description and Purpose Culvert inlet/outlet protection typically consists of gravel riprap that act as energy dissipation features, thus allowing for the settling of sediments, while preventing piping or undercutting from occurring at the inlet or outlet. Riprap should consist of small to medium gravels that are layered to achieve uniform density. Implementation General Culverts may be installed on a site specific basis to provide a method of transport through confining features such as roadways and well pads. Cross Road Drainage By Pipe Culvert etlapam a au L Usually installed on permanent roads with regular vehicle 2. Recommended for: A. Insloped roads wish side clinches B. Natural Draws C. Draining Seeps 3. Inspect culverts regularly for failing conditions. D4 Design and Layout • Install riprap, grouted riprap, or concrete apron at selected outlet. Riprap aprons are best suited for temporary use during construction. • Carefully place riprap to avoid damaging the filter fabric, if applicable. • For proper operation of apron: o Align apron with receiving stream and keep straight throughout its length. If a curve is needed to fit site conditions, place it in upper section of apron. o If size of apron riprap is large, protect underlying filter fabric with a gravel blanket. • Outlets on slopes steeper than 10% shall have additional protection. Inspection and Maintenance • Inspect BMPs prior to forecasted precipitation, daily during extended precipitation events, after precipitation events, weekly during the rainy season, and at two-week intervals during the non -rainy season. • Repair or fill any unnecessary gaps or holes in the inlet/outlet of culverts. • Inspect for scour beneath the riprap and around the outlet. Repair damage to slopes or underlying filter fabric immediately. • Temporary devices shall be completely removed as soon as the surrounding drainage area has been stabilized, or at the completion of construction. D5 Diversion Berm/Channel Description and Purpose A diversion berm or channel is a structure that intercepts, diverts and conveys surface run-on, generally sheet flow, to prevent erosion. E arth dikes/drainage swales are not suitable as sediment trapping devices as the main purpose is to manage flow direction. These structures may however be modified when integrated with other soil stabilization and sediment controls, such as check dams, plastics, and blankets, to prevent scour and erosion in newly graded dikes, swales and ditches. Implementation General Earth dikes/drainage swales may be used to convey surface runoff down sloping land, intercept and divert runoff to avoid sheet flow over sloped surfaces, divert and direct runoff towards a stabilized watercourse or channel or intercept runoff from hardened surfaces such as well pads or roadways. A dditionally, earth dikes/drainage swales may be used below steep grades where runoff begins to concentrate, along roadways and facility improvements subject to flood drainage. at the top of slopes to divert run-on from adjacent or undisturbed slopes and/or at bottom and mid -slope locations to intercept sheet flow and convey concentrated flows. Design and Layout • Install riprap, grouted riprap, or concrete apron at selected outlet. Riprap aprons are best suited for temporary use during construction. • Compact subgrade and/or berm. • Use stabilizing cover (i.e. seeding, hydroseeding or blankets) when necessary, as determined by slope and erosion potential of the soil. • Modification of this BMP type may be necessary due to site specific requirements. At these locations sediment basins, rock check dams, erosion control blankets and/or seeding types of BMPs will be integrated. Design, layout and implementation should maintain and follow each BMP type general installation specification. • Refer to the schematic detail at the end of this section. D6 Inspection and Maintenance • Inspect BMPs prior to forecasted precipitation, daily during extended precipitation events, after precipitation events, weekly during the rainy season, and at two-week intervals during the non -rainy season. • Inspect ditches and berms for washouts. Replace lost riprap, damaged linings or soil stabilizers as needed. • Inspect channel embankments, linings and beds of ditches and berms for erosion and accumulation of debris and sediment. Remove debris and sediment once 75% of the capacity has been filled, and repair linings and embankments as needed. • Temporary conveyances shall be completely removed as soon as the surrounding drainage area has been stabilized, or at the completion of construction. 600 mm Min Compacted fill Stabilizing cover, when needed. Natural ground line Flow fi �— t�� 1:2 (V: H) slope or flatter TYPICAL DRAINAGE SWALE NOT TO SCALE Compacted fill NOTES: 1. Stabilize inlet, outlets and slopes. 2. Properly compact the subgrade 600 mm Min Stabillzing cover, when needed Natural ground line TYPICAL EARTH DIKE NOT TO SCALE D7 Flow Strip T1='„,,11111111: == Erosion Control Blankets buy upper edoeaf meeting &' minimum Ilrnitd of mulched Arai Enene mortal over ardss Aird tap ER rnchm sings Description and Purpose Made out of environmentally friendly, biodegradable material, erosion control blankets are installed on di sturbed slopes that are requiring stability. They stabilize slopes, and provide for an increased water holding capacity, which ultimately increased the rate and establishment of desired vegetative cover. Implementation General Erosion control blankets should installed smoothly on t he surface of the soil, loose enough to allow for vegetation establishment. The blankets are to be in complete contact with the soil to prevent any tenting. The upslope end of the blanket should be buried in a trench with ideal dimensions of 6"x6". Where one blanket ends and another begins, there should be 4-6 inches of overlap. Refer to end of section for generic installation detail. Design and Layout Erosion control blankets are typically installed in are that have: steep slopes, generally steeper than 1:3 (V:H); slopes where the erosion potential is high; slopes and disturbed soils where mulch must be anchored; disturbed areas where plants are slow to develop; channels with flows exceeding 1.0 m/s (3.3 ft/s); channels to be vegetated; stockpiles (as the ground necessary and applicable according to use stipulations); and slopes adjacent to water bodies of Environmentally Sensitive Areas (ESAs). D8 There are many types of erosion control blankets and mats, and selection of the appropriate type shall be based on the specific type of application and site conditions. Selection(s) made by the Contractor must be approved by appropriate and designated administrative personnel. Erosion Control Blankets/Mats • Biodegradable rolled erosion control products (RECPs) are typically composed of jute fibers, curled wood fibers, straw, coconut fiber, or a combination of these materials. For an RECP to be considered 100% biodegradable, the netting, sewing or adhesive system that holds the biodegradable mulch fibers together must also be biodegradable. o Jute is a natural fiber that is made into a yarn, which is loosely woven into a biodegradable mesh. It is designed to be used in conjunction with vegetation and has longevity of approximately one year. The material is supplied in rolled strips, which shall be secured to the soil with U-shaped staples or stakes in accordance with manufacturers' recommendations. o Excelsior (curled wood fiber) blanket material shall consist of machine produced mats of curled wood excelsior with 80 percent of the fiber 150 mm (6 inches) or longer. The excelsior blanket shall be of consistent thickness. The wood fiber shall be evenly distributed over the entire area of the blanket. The top surface of the blanket shall be covered with a photodegradable extruded plastic mesh. The blanket shall be smolder resistant without the use of chemical additives and shall be non-toxic and non -injurious to plant and animal life. Excelsior blanket shall be furnished in rolled strips, a minimum of 1220 mm (48 inches) wide, and shall have an average weight of 0.5 kg/m2 (12 lb/ft2), ±10 percent, at the time of manufacture. Excelsior blankets shall be secured in place with wire staples. The material is furnished in rolled strips, which shall be secured to the ground with U-shaped staples or stakes in accordance with manufacturers' recommendations. o Straw blanket shall be machine -produced mats of straw with a lightweight biodegradable netting top layer. The straw shall be attached to the netting with biodegradable thread or glue strips. The straw blanket shall be of consistent thickness. The straw shall be evenly distributed over the entire area of the blanket. Straw blanket shall be furnished in rolled strips a minimum of 2 m (6.5 ft) wide, a minimum of 25 m (80 ft) long and a minimum of 0.27 kg/m2 (6.4 lb/ft2). Straw blankets shall be secured in place with wire staples. The material is furnished in rolled strips, which shall be secured to with U-shaped staples or stakes in accordance with manufacturers' recommendations. o Wood fiber blanket is composed of biodegradable fiber mulch with extruded plastic netting held together with adhesives. The material is designed to enhance revegetation. The material is furnished in rolled D9 strips, which shall be secured to the ground with U-shaped staples or stakes in accordance with manufacturers' recommendations. o Coconut fiber blanket shall be machine -produced mats of 100% coconut fiber with biodegradable netting on the top and bottom. The coconut fiber shall be attached to the netting with biodegradable thread or glue strips. The coconut fiber blanket shall be of consistent thickness. The coconut fiber shall be evenly distributed over the entire area of the blanket. Coconut fiber blanket shall be furnished in rolled strips with a minimum of 2 m (6.5 ft) wide, a minimum of 25 m (80 ft) long and a minimum of 0.27-kg/m2 (6.4 lb/ft2). Coconut fiber blankets shall be secured in place with wire staples. The material is furnished in rolled strips, which shall be secured to the ground with U-shaped staples or stakes in accordance with manufacturers' recommendations. o Coconut fiber mesh is a thin permeable membrane made from coconut or corn fiber that is spun into a yarn and woven into a biodegradable mat. It is designed to be used in conjunction with vegetation and typically has longevity of several years. The material is supplied in rolled strips, which shall be secured to the soil with U-shaped staples or stakes in accordance with manufacturers' recommendations. o Straw coconut fiber blanket shall be machine -produced mats of 70%straw and 30% coconut fiber with a biodegradable netting top layer and a biodegradable bottom net. The straw and coconut fiber shall be attached to the netting with biodegradable thread or glue strips. The straw coconut fiber blanket shall be of consistent thickness. The straw and coconut fiber shall be evenly distributed over the entire area of the blanket. Straw coconut fiber blanket shall be furnished in rolled strips a minimum of 2 m (6.5 ft) wide, a minimum of 25 m (80 ft) long and a minimum of 0.27 kg/m2 (6.4 lb/ft2). Straw coconut fiber blankets shall be secured in place with wire staples. The material is furnished in rolled strips, which shall be secured to the ground with U-shaped staples or stakes in accordance with manufacturers' recommendations. • Non -biodegradable RECPs are typically composed of polypropylene, polyethylene, nylon or other synthetic fibers. In some cases, a combination of biodegradable and synthetic fibers is used to construct the RECP. Netting used to hold these fibers together is typically non -biodegradable as well. o Plastic netting is a lightweight biaxially -oriented netting designed for securing loose mulches like straw to soil surfaces to establish vegetation. The netting is photodegradable. The netting is supplied in rolled strips, which shall be secured with U-shaped staples or stakes in accordance with manufacturers' recommendations. o Plastic mesh is an open -weave geotextile that is composed of an extruded synthetic fiber woven into a mesh with an opening size of less than 0.5 cm (0.2 inch). It is used with revegetation or may be used to secure loose fiber such as straw to the ground. The material is D10 supplied in rolled strips, which shall be secured to the soil with U- shaped staples or stakes in accordance with manufacturers' recommendations. o Synthetic fiber with netting is a mat that is composed of durable synthetic fibers treated to resist chemicals and ultraviolet light. The mat is a d ense, three-dimensional mesh of synthetic (typically polyolefin) fibers stitched between two polypropylene nets. The mats are designed to be revegetated and provide a permanent composite system of soil, roots, and geomatrix. The material is furnished in rolled strips, which shall be secured with U-shaped staples or stakes in accordance with manufacturers' recommendations. o Bonded synthetic fibers consist of a three-dimensional geomatrix nylon (or other synthetic) matting. Typically it has more than 90% open area, which facilitates root growth. Its tough root -reinforcing system anchors vegetation and protects against hydraulic lift and shear forces created by high volume discharges. It can be installed over prepared soil, followed by seeding into the mat. Once vegetated, it becomes an invisible composite system of soil, roots, and geomatrix. The material is furnished in rolled strips that shall be secured with U- shaped staples or stakes in accordance with manufacturers' recommendations. Combination synthetic and biodegradable RECPs consist of biodegradable fibers, such as wood fiber or coconut fiber, with a heavy polypropylene net stitched to the top and a high-strength continuous filament geomatrix or net stitched to the bottom. The material is designed to enhance revegetation. The material is furnished in rolled strips, which shall be secured with U-shaped staples or stakes in accordance with manufacturers' recommendations. Inspection and Maintenance • Inspect blankets prior to forecast rain, daily during extended rain events, after rain events, weekly during the rainy season, and at two-week intervals during the non - rainy season. • Repair any unnecessary gaps or holes in the blankets. • Inspect to make sure that there is uniform contact with the soil. Dil Typical Installation Detail INITIAL CHANNEL ANCHOR NTS Stake at 1 m to 1.5 m intervals TRENCH \.\\\���\ll\l TERMINAL SLOPE AND CHANNEL ANCHOR TRENCH NTS 150 mm INTERMITTENT CHECK SLOT NTS mm }fry\!}- Check slot at 8 m intervals ISOMEIhIC VIEW NTS F1O0 mm x 100 mm anchor shoe 100 mm 100 mm LONGITUDINAL ANCHOR TRENCH NTS NOTES: 1. Check slots to be constructed per manufacturers specifications. 2. Staking or stapling layout per manufacturers specifications. 3. Install per manufacturer's recommendations D12 Typical Installation Detail 150 mm x 150 mm anchor trench Berm Mats/blankets should be installed vertically downslope. 50 mm 75 m ISOMETRIC VIEW >\/x//\//�\��,TYPICAL SLOPE .�.\\40 SOIL STABLIZATIONNTS WET SLOPE LINING NTS ,ikef 60'0' ad0•4e sQ Ater _i ager �ayele _Non- oven geotextile filter fabric under typical treatment. NOTES: 1. Slope surface shall be free of rocks, clods, sticks and grass. Mats/blankets shall have good soil contact. 2. Lay blankets loosely and stake or staple to maintain direct contact with the soil. Do not stretch. 3. Install per manufacturer's recommendations D13 Fiber Rolls Description and Purpose A fiber roll consists of straw, flax, or other similar materials bound into a tight tubular roll. W hen fiber rolls are placed at the toe and on the face of slopes, they intercept runoff, reduce its flow velocity, release the runoff as sheet flow, and provide removal of sediment from the runoff. B y interrupting the length of a slope, fiber rolls can also reduce erosion. Implementation Fiber Roll Materials • Fiber rolls should be either prefabricated rolls or rolled tubes of erosion control blanket. Assembly of Field Rolled Fiber Roll • Roll length of erosion control blanket into a tube of minimum 8 in. diameter. • Bind roll at each end and every 4 ft along length of roll with jute -type twine. Installation • Locate fiber rolls on level contours spaced as follows: o Slope inclination of 4:1 (H:V) or flatter: Fiber rolls should be placed at a maximum interval of 20 ft. o Slope inclination between 4:1 and 2:1 (H:V): Fiber Rolls should be placed at a maximum interval of 15 ft. (a closer spacing is more effective). o Slope inclination 2:1 (H:V) or greater: Fiber Rolls should be placed at a maximum interval of 10 ft. (a closer spacing is more effective). • Turn the ends of the fiber roll up s lope to prevent runoff from going around the roll. • Stake fiber rolls into a 2 to 4 in. deep trench with a width equal to the diameter of the fiber roll. 0 D14 o Drive stakes at the end of each fiber roll and spaced 4 ft maximum on center. o Use wood stakes with a nominal classification of 0.75 b y 0.75 in. and minimum length of 24 in. • If more than one fiber roll is placed in a row, the rolls should be overlapped, not abutted. • Refer to following schematic drawings for further installation details. Inspection and Maintenance • Inspect blankets prior to forecast rain, daily during extended rain events, after rain events, weekly during the rainy season, and at two-week intervals during the non - rainy season. • Inspect to make sure that there is uniform contact with the soil. • Maintain fiber rolls to provide an adequate sediment holding capacity. Sediment shall be removed when the sediment accumulation reaches 75 % of the barrier height. • Repair or replace split, torn, unraveling, or slumping fiber rolls. Nuke 1 ra.r Ra1i s Rol E.car..ea EIG.r motrtol Nolan SECTION TEMPORARY FIBER ROLL (TYPE 1) Grodrrg Conform 1,Fhr Rm.,. Spawa Ewoll, Fon NMI. 51,11.5 11per Nolle Sowed ESDI IT Alar{; SOp& <k m ma... IT0s. o1 SIrol IEM'QRARY FIBER ROLL (TYPE 21 09 ?oo PGlps OOa. ;.04(5000(005150t((,1(.4,f((Ht,' Nif"((i(tt((<t(((((fl t(((t e ((i(((((((((((((((( ((�AE(((Kfll(�u(j1((� Gr.dlra Contac. ar lop or Slate PER5PECTIV� TEMPORARY FIBER ROLL (TYPE II 0pr1e. 5100. Ila 11li.116n r rpr Re' ] Ecowa.ea k0rerlrl 2 .. 2.or. Gradt.q [09900.9 Fite, Ro1'0 %Goma EaWIIy AIO9p Slot. 16 m max.1 Glbr *011.5009.0 Eawillr AlOry S1aoO Ik . 1mi. 1 P.5 m Ater. To. or Slaw Go ELEVATION NOTCH °ETAIL NOT rasrm.'. aep0m9.5 .gor .mo- .hoe 1rmana r. . 6rvalrq 00,1.0.9 TOP Pr Slope ttc-iQ(tt (1{l (4140(044 (((((C((t(ili«C lt((((f(((((((ttn\ • 4; 09e i.sm to l.dm {(((((t((tK(((K(tt(( tc;�t((d((�((([r� t(10'` Grodrna C. turn T ra M 51*IF. PERSPECIOM TEMPORARY FIBER ROLL (TYPE 2) D15 IYrlr SFas Ir.l.rOtrim. 11011 rr , �+ �'a r rrrrrrrrrrr��rrrr r rrrrrrrrrrrrr 1- rrrrrrrrrrrrr �'rr 11 rrr rr rr /r rrr 111 ai �rrrr.l Grrrrrrrr III r rrr°rjrrrrrfrrr� rrrrr r III 4 r,rrrrrrrrrrrrr.lj,l'i W �rrrrrrrrrrrrr r rrrrrrrrrrr r III r.r..r III' a Note: Install fiber roll along a level contour. Vertical spacing along face of the slope varies between 3m and 6 m r rrrrrrr rr r rrrrrrrfrrrrrf r r I rrrrrrrrrr'rrrirr M� rr rr rr rr rrr I I I r rrrrrrrrriy rr rr � r I I I rrrrrr�rr7yrr r yIII rrrrrrrrrrrrr,J}�r r rr rr rr rr rr rrr rrrlrrrrrrrrrr�rfr r I1 I rrrrrrrrr III 4 rrrrr 111 4 r .. TYPICAL FIBER ROLL INSTALLATION N.T.S. 50 to 100 mm 300 mm rnin. Install a fiber roll near slope where it transitions into a steeper slope Fiber roll 200 mm min x 19mmi9mm wood stakes mox1.2m spacing ENTRENCHMENT DETAIL N.T.S. D16 Rope Tie Slope J �aries 50 to 100 mm 300 mrn min. Fiber roll 200 mm min 19 mm x 19mm wood stakes max 1.2 m spacing (typ.) OPTIONAL ENTRENCHMENT DETAIL N.T.S. D17 Seeding/Hydraulic Erosion control Description and Purpose Areas of disturbance are inevitable and are the premise for storm water management. To ensure the integrity of our water and vegetative communities as well as the security of our appreciable aesthetic surroundings revegetating disturbed areas is essential to this desire. Minimizing use areas, stabilizing slopes and restoring the area to pre -disturbance conditions are hinged upon successful completion of the practices described within this section. There are a v ariety of methods that can be used to achieve the temporary and permanent vegetative cover required. These seeding methods are to include: • Hand (where applicable due to terrain and accessible distance); • Broadcast; • Drill/Disc; and • Hydraulic (with or without the addition of a tackifier). Hydraulic erosion control consists of applying a mixture of shredded wood or coconut and wood fiber or a hydraulic matrix and a stabilizing emulsion or tackifier with hydroseeding equipment, which temporarily protects exposed soil from erosion by raindrop impact or wind. Hydraulic erosion control is applied to disturbed areas requiring temporary protection until permanent vegetation is established. Immediately, or nearly immediately in some cases, the hydromulch bonds to the soil, providing slope protection to and essential seed -to -soil contact required for successful and rapid germination leading to desired vegetative establishment and cover. Implementation Seed mix will be as determined by appropriate personnel, the BLM or current landowner. Typical seeding practices will be as follows: • Temporary seed mix should include annual, cereal crop seeds such as oats or barley, or sterile hybrid such as "Regreen" to establish vegetative cover and suitable grass species. Grass seed will be included in the seed mix to provide D18 sustainable vegetative cover in the event that a w ell pad remains in the construction phase for longer than one year. • The permanent seed mix, rate, application method, and supplemental materials will be determined by appropriated personnel or the BLM/Landowner as appropriate for the land ownership. Generally, seeding will occur by broadcasting (hand and/or mechanical), drilling or hydroseeding (where applicable with inclusion of a tackifier). Design and Layout Application rates and procedures typically used are included as Figure 1 in this section. Additional seeding and mulching details are as follows: General Standards and Specifications • Prior to application, roughen embankment and fill areas by rolling with a crimping or punching type roller or by track walking. Track walking shall only be used where other methods are impractical. • Hydraulic matrices require 24 hours to dry before rainfall occurs to be effective. • Avoid mulch over -spray onto the traveled way and existing vegetation. • Hydraulic mulches and seed mixes used by the Contractor must be approved by appropriate personnel. • Types of mulch and typical application rate and procedures: Hydraulic Mulch Wood fiber mulch is a component of hydraulic applications. It is typically applied at the rate of 2,250 to 4,500 kilograms per hectare (kg/ha) (2,000 to 4,000 lb/ac) with 0-5% by weight of a stabilizing emulsion or tackifier (e.g., guar, psyllium, acrylic copolymer) and applied as a slurry. This type of mulch is manufactured from wood or wood waste from lumber mills or from urban sources. Hydraulic Matrix Hydraulic matrix is a combination of wood fiber mulch and tackifier applied as slurry. It is typically applied at the rate of 2,250 to 4,500 kg/ha with 5-10% by weight of a stabilizing emulsion or tackifier (e.g., guar, psyllium, acrylic copolymer). D19 Bonded Fiber Matrix Bonded fiber matrix (BFM) is a hydraulically -applied system of fibers and adhesives that upon d rying forms an erosion -resistant blanket that promotes vegetation, and prevents soil erosion. BFMs are typically applied at rates from 3,400 k g/ha to 4,500 kg/ha based on t he manufacturer's recommendation. The biodegradable BFM is composed of materials that are 100% biodegradable. The binder in the BFM should also be biodegradable and should not dissolve or disperse upon re -wetting. Typically, biodegradable BFMs should not be applied immediately before, during or immediately after rainfall if the soil is saturated. Depending on the product, BFMs require 12 to 24 hours to dry to become effective. Flexible Growth Medium Flexible Growth MediumTM (FGM) is a hydraulically applied substrate that is composed of long strand, Thermally Refined® wood fibers, crimped, interlocking man-made fibers and performance -enhancing additives. The FGM requires no curing period and upon application forms an intimate bond w ith the soil surface to create a continuous, porous, absorbent and flexible erosion resistant blanket. S lope interruption devices or water diversion techniques are recommended when slope lengths exceed 100 ft (30 m). FGMs are typically applied at a rate ranging from 3,400 k g/ha to 5,100 kg/ha (generally 3900 kg/ha), based on t he manufacturer's recommendation. The biodegradable FGM is composed of materials that are 100% biodegradable. Inspection and Maintenance • Inspect hydromulched areas prior to forecast rain, after rain events and at two- week intervals during the non -rainy season. • Maintain an unbroken, temporary mulched ground cover throughout the period of construction when the soils are not being reworked. As previously noted, inspect before expected rain storms and repair any damaged ground cover and re -mulch exposed areas of bare soil. D20 Sediment Basin Description and Purpose A sediment basin provides adequate settling time, retention capacity and reduction of flow velocities minimizing erosion and allowing for settling of suspended sediment. A basin may be constructed by the construction of a barrier or dam across a natural drainage path, by excavating a basin or by a combination of both. Basins usually consist of a dam, blanketed or hydroseeded downgradient slopes/berms and a stabilized outlet (spillway). Implementation A sediment basin is a temporary containment area that allows sediment in collected storm water to settle out during infiltration or before the runoff is discharged through a stabilized spillway. Sediment basins are formed by excavating or constructing an earthen embankment across a waterway or low drainage area. Basins should be placed at the end of perimeter sediment ditches, diversion ditches, along bar ditches upgradient areas from which sediment -laden storm water directly enters a drainage or watercourse. The size of the structure will depend upon t he location, size of drainage area, soil type, rainfall pattern and desired outflow releases. Design and Layout • Sediment basins should be constructed prior to the rainy season and commencement of construction activities in the area. • Sediment basins are not to be constructed in any live stream. • Sediment basin(s), as measured from the bottom of the basin to the principal outlet, should have at least a capacity equivalent to 100 cubic meters (3,532 cubic feet) of storage per hectare (2.47 acres) draining into the sediment basin. The length of the basin should be more than twice the width of the basin. The length is determined by measuring the distance between the inlet and the outlet. The depth must not be less than 0.9 m (3 ft) nor greater than 1.5 m (5 ft) for safety reasons and for maximum efficiency. • Multiple traps and/or additional volume may be required to accommodate site specific rainfall and soil conditions. • Basins with an impounding levee greater than 1.5 m (5 ft) tall, measured from the lowest point to the impounding area to the highest point of the levee, and basins D21 capable of impounding more than 1000 cubic meters (35,300 cubic feet), shall be individually designed and implemented with direct on-site oversight provided by appropriate and designated personnel. A dditional safety requirements such as fencing may also be required. • Rock, blankets, hydromulch and/or vegetation shall be used to protect the basin inlet and slopes against erosion. • Embankments shall be constructed of a material and size (i.e. sorted, with fines) capable of attaining sufficient levels of compaction and conductivity to ensure the structural integrity of the structure and its desired retention capacity and capability. Generally compaction of the structure is by use of heavy machinery • Use rock or vegetation in addition to geotextile to protect the basin outlet(s) against erosion. Inspection and Maintenance • Inspect sediment basins prior to forecast rain, daily during extended rain events, after rain events, weekly during the rainy season, and at two-week intervals during the non -rainy season. • Inspect sediment basin banks for embankment seepage and structural soundness. • Inspect inlet and outlet (rock spillway) areas for erosion, damage or obstructions and stabilize/maintenance as necessary. • Remove accumulated sediment when the volume has reached one-third the original trap volume. • Properly disposed of sediment and debris removed from the trap. D22 Silt Fence Description and Purpose A silt fence is made of a filter fabric that has been entrenched, attached to supporting poles, and sometimes backed by a plastic or wire mesh for support. The silt fence detains sediment -laden water, promoting sedimentation behind the fence Implementation A silt fence is a temporary sediment barrier consisting of filter fabric stretched across and attached to supporting posts, entrenched, and, depending upon the strength of fabric used, supported with plastic or wire mesh fence. Silt fences trap sediment by intercepting and detaining small amounts of sediment -laden runoff from disturbed areas in order to promote sedimentation behind the fence. Silt fences are preferable to straw bale barriers in many cases. Laboratory work at the Virginia Highway and Transportation Research Council has shown that silt fences can trap a much higher percentage of suspended sediments than can straw bales. While the failure rate of silt fences is lower than that of straw bale barriers, there are many instances where silt fences have been improperly installed. The following layout and installation guidance can improve performance and should be followed: • Use principally in areas where sheet flow occurs. • Don't use in streams, channels, or anywhere flow is concentrated. Don't use silt fences to divert flow. • Don't use below slopes subject to creep, slumping, or landslides. • Select filter fabric that retains 85% of soil by weight, based on sieve analysis, but that is not finer than an equivalent opening size of 70. • Install along a level contour, so water does not pond more than 1.5 ft at any point along the silt fence. • The maximum length of slope draining to any point along the silt fence should be 200 ft or less. • The maximum slope perpendicular to the fence line should be 1:1. • Provide sufficient room for runoff to pond behind the fence and to allow sediment removal equipment to pass between the silt fence and toes of slopes or other obstructions. About 1200 ft2 of ponding area should be provided for every acre draining to the fence. D23 • Turn the ends of the filter fence uphill to prevent storm water from flowing around the fence. • Leave an undisturbed or stabilized area immediately down slope from the fence where feasible. • Silt fences should remain in place until the disturbed area is permanently stabilized. Materials • Silt fence fabric should be woven polypropylene with a minimum width of 36 in. and a minimum tensile strength of 100 lb force. The fabric should conform to the requirements in ASTM designation D4632 and should have an integral reinforcement layer. T he reinforcement layer should be a polypropylene, or equivalent, net provided by the manufacturer. T he permittivity of the fabric should be between 0.1 sec -1 and 0.15 sec -1 in conformance with the requirements in ASTM designation D4491. • Wood stakes should be commercial quality lumber of the size and shape shown on the plans. Each stake should be free from decay, splits or cracks longer than the thickness of the stake or other defects that would weaken the stakes and cause the stakes to be structurally unsuitable. • Staples used to fasten the fence fabric to the stakes should be not less than 1 75 in. long and should be fabricated from 15 gauge or heavier wire. The wire used to fasten the tops of the stakes together when joining two sections of fence should be 9 -gauge or heavier wire. Galvanizing of the fastening wire will not be required. • There are new products that may use prefabricated plastic holders for the silt fence and use bar reinforcement instead of wood stakes. If bar reinforcement is used in lieu of wood stakes, use number four or greater bar. P rovide end protection for any exposed bar reinforcement. Inspection and Maintenance • Inspect silt fence prior to forecast rain, daily during extended rain events, after rain events, weekly during the rainy season, and at two-week intervals during the non -rainy season. • Maintain silt fences to provide an adequate sediment holding capacity. Sediment shall be removed when the sediment accumulation reaches one-third (1/3) of the barrier height. • Repair undercut silt fences. • Repair or replace split, torn, slumping, or weathered fabric. Silt fences that are damaged and become unsuitable for the intended purpose shall be removed from the site of work, disposed of and replaced. • Holes, depressions or other ground disturbance caused by the removal of the temporary silt fences shall be backfilled. • Remove silt fence when no longer needed or as required. Fill and compact post holes and anchorage trench, remove sediment accumulation and grade fence alignment to blend with adjacent ground (approximate original contour). D24 Cross barrier (See note 10) Max reach = 155 m (See note 1) Toe of slope rn NOTES 2.5 m Fabric Cross barrier 1 Optional maintenance opening detail PLAN TEMPORARY LINEAR SEDIMENT BARRIER (TYPE SILT FENCE) 1. Construct the length of h does noch t en thad %3 the height of the linear lavation along the the change in base Harrier. is ease shall the reach length exceed 15Dm. 2. The lest 2.5 m of Ione. shell he turned op slop. - 3. Stake dimension are nominal. 4. Dimension may vary to fit field condition. Stakes shell be spaced at 2.5 m maximum and .hell be positioned on downstream side o1 fence. 6. Stakes to overlap and fence fabric to fold around each stake one full turn secure fabric to .take with 4 staple.. Stokes shall be driven tightly together to prevent potential flour—through of sediment at joint. The tope of the stakes shall be secured with wire. For end stake, fence fabric obeli be folded around ton slakes one full turn end secured with 4 staples, B_ Minimum 4 staples per stake_ Dimensions shown are typical_ 10. Cross barriers shall be aum of 1/3 and a mamm muof 1/2 the height of the linear barrier. 11. Maintenance openings shall be constructed in a manner to ensure sediment remains behind silt fence. 12. Joining sections .hell not be placed at .imp location, 13. Sandbag rows and layers shall be offset to eliminate gaps. LEGEND Tamped bae1RH1 Slope direction Direction of flow D25 CROSS BARRIER DETAIL SECTION C—C TEMPORARY LINEAR SEDIMENT BARRIER (TYPE SILT FENCE) NO SCALE AIL DIMENSIONS ARE IN MILLIMETERS UNLESS OTHERWISE 511011-14 Slope Setback varies (See note 4) Fabric 50 X 50 Wood stake (See nates 3 & 5) Toe of elope See detail A 150 SECTION A—A END DETAIL JOINING SECTION DETAIL (TOP VIEW) Fabric (See note 0) 50 X 50 wood stake (See note 0) END STAKE DETAIL (TOP VIEW) fence Silt fabric 41.4140. 44" 4414.46,44410. .1.111.41-04 OPTIONAL MAINTENANCE OPENING DETAIL D26 (SEE NOTE 11) 150 DETAIL A Straw Bale Barrier Description and Purpose A straw bale barrier is a series of straw bales placed on a level contour to intercept sheet flows. The use of a straw bale barrier ponds sheet- flow runoff, allowing sediment to settle out. Implementation A straw bale barrier consists of a row of straw bales placed on a 1 evel contour. When appropriately placed, a straw bale barrier intercepts and slows sheet flow runoff, causing temporary ponding. T he temporary ponding provides quiescent conditions allowing sediment to settle. Straw bale barriers also interrupt the slope length and thereby reduce erosion by reducing the tendency of sheet flows to concentrate into rivulets, which erode rills, and ultimately gullies, into disturbed, sloped soils. Straw bale barriers have not been as effective as expected due to improper use and installation. These barriers have been placed in streams and drainage ways where runoff volumes and velocities have caused the barriers to wash out. In addition, failure to stake and entrench the straw bale has allowed undercutting and end flow. Use of straw bale barriers in accordance with this BMP should produce acceptable results. Bales should be placed in a single row on a level contour with ends tightly abutting one another. All bales should be installed on their sides so that twine or binding runs around side of bale rather than on the top and bottom. Bales should be trenched in and staked. See illustration below. D27 a. Hay Bales (or bundles of grass) Tamped soil Leave no gaps between bales Staked and entrenched straw bale- (Use two stakes per bale.) iftilli,1116/4114011101 14417114141000111/11 A11010 r ▪ � D ' 0 a Bales key. Note: Problems can developfrom water rimming between and under 1p ed ) g 10 cm dee hay bales. Install them carefully. Long-term structures must be periodi- into soil Cally cleaned and maintained. • •• n . 5 Materials • Straw Bale Size: Each straw bale should be a minimum of 14 in. wide, 18 in. in height, 36 in. in length and should have a minimum mass of 50 lbs. The straw bale should be composed entirely of vegetative matter, except for the binding material. • Bale Bindings: B ales should be bound b y steel wire, nylon or polypropylene string placed horizontally. Jute and cotton binding should not be used. Baling wire should be a minimum diameter of 14 -gauge. Nylon or polypropylene string should be approximately 12 -gauge in diameter with a breaking strength of 80 lbs force. • Stakes: Wood stakes should be commercial quality lumber of the size and shape shown on the plans. Each stake should be free from decay, splits or cracks longer than the thickness of the stake, or other defects that would weaken the stakes and cause the stakes to be structurally unsuitable. Steel bar reinforcement should be equal to a #4 designation or greater. End protection should be provided for any exposed bar reinforcement. Inspection and Maintenance • Inspect straw bale barriers prior to forecast rain, daily during extended rain events, after rain events, weekly during the rainy season, and at two-week intervals during the non -rainy season. • Inspect straw bale barriers for sediment accumulations and remove sediment when depth reaches one-third the barrier height. • Replace or repair damage bales and washouts as needed • Remove straw bales when no longer needed. Remove sediment accumulation, and clean, re -grade, and stabilized the area. D28 LEGEND DIRE7I019 OF FLAW SANDBAG CROSS BARRIER Slope Setback varies Toe of slope 501'50 !ood stake Straw bale barrier SECTION B—B Bale binding E D29 TEMPORARY LINEAR SEDIMENT BARRIER (TYPE STRAW BALE) t`Ei SCALE ALL anIEIHNIES AR Ili ffi1naffis MEM e'ffiaIS6 SEMI i ch 1be oaa barrier PLAN TEMPORARY LINEAR SEDIMENT BARRIER (TYPE STRAW BALE) Straw bale on outside Sinpr Tae ai dose Straw bale an inside END DETAIL Straw bale on antslde TEMPORARY LINEAR SEDIMENT BARRIER (TYPE STRAW DALE) NE SCALE /ALL DIMENSIONS ARE IN HILL NIETHRR UNLESS OTHERWISE SRN D30 End Atha Water Bar Description and Purpose A water bar is made of earthen fill, mound -trench built into a road, pipeline right-of-way (ROW) or well pad. The purpose is to divert water and dissipate energy by reducing flow velocity by redirecting inertia direction. Implementation Design and Layout Water bars are to be implemented at a 15 to 30 degree downslope position relative to the relief and layout of the roadway, ROW or well pad. Water bars are to be constructed using a bulldozer or road grater. The water bar should be built such that the uphill end of the bar ties into any adjacent bank, cut wall or preserved existing vegetation to receive ditch flow. An energy absorber on the downslope outfall, such as riprap, brush, native vegetative filter and the like, will serve to slow and dissipate the water's energy. When installed in series, the number used is dependent on the slope of the site/surrounding area and should generally proceed as follows: Grade (Degrees) Spacing (feet) between Water Bars 0-5 None Required 5-15 300 15-30 200 30 100 Water bars should be armored under circumstances of steep grades. The BMP should be also be stabilized with seeding/mulching with a mixture determined/agreed upon b y an appropriate party. Water bars implemented at a pad entrance are intended to contain water on the pad. At these locations the water bar should be built such that both end tie into the pad perimeter berm. This provides 100% containment and control of the storm water collected on the pad from precipitation. D31 Inspection and Maintenance • BMPs will be inspected every 14 days or within 24 hours of a significant storm event. • Inspect sediment basins for sediment load and erosion around over flow. Inspect check dams for sediment load, and rilling from water tracking around outer edge of check dam. D32 Vehicle Tracking Pad sa, 6" Minimu 1"-2" washed rock ROCK CONSTRUCTION ENTRANCE Description: A rock construction entrance pad may be necessary at construction access locations to reduce the amount of mud transported onto paved roads by vehicles or surface runoff. Rock construction entrance pads provide an area where mud can be removed by vehicle tires traveling over the gravel pad before entering public roads. A construction entrance is a stabilized pad of aggregate over a geotextile base and is used to reduce the amount of mud tracked off-site with construction traffic. A temporary construction entrance is a s tone pad located where vehicles leave a construction site. The purpose of the stone pad is to provide an area where mud can be removed from tires before a vehicle leaves the site. The stone pad consists of clean rock designed in such a way that vehicle tires will sink in slightly. This helps remove mud from the tires as the vehicle passes over the pad. If a wash rack is used, it provides an area where vehicle tires can be washed. Effectiveness: The effectiveness of temporary rock construction entrances for trapping sediment depends upon the length, depth of rock, frequency of use and maintenance, as well as the type of structure used. A newly installed rock construction entrance meeting the recommendations included here will be relatively effective for removing mud from tires before construction vehicles leave the site. However, once the rock voids become clogged with mud, the practice will not serve its intended D33 purpose until the rock is replaced. W ashing vehicle tires with pressurized water over a wash rack will increase the effectiveness of the tracking pad for removing mud. Advantages: • Cost-effective • Highly effective for erosion and sediment control Limitations: • Muddy sites will require extensive maintenance of the vehicle tracking pad to ensure effective sediment removal. • Gravel can become quickly saturated with mud in certain soils and moisture conditions Design: The aggregate is recommended to be 1 to 3 inch washed rock. The aggregate layer should be 6 inches thick and extend the full width of the ingress and egress areas. The rock pad should be at least 50 feet long. A geotechnical fabric may be used under the aggregate to minimize the migration of stone into the underlying soil by heavy vehicle loads. If the majority of mud is not removed by vehicles traveling over the rock pad, the tires of the vehicle should be washed before entering a paved road. Wash water should be directed to a settling area to remove sediments. A wash rack installed on the rock pad may make washing more convenient and effective in removing sediment. Specifications: • The rock used for gravel pads should be a minimum 1 to 3 inch size, coarse aggregate • Aggregate should be placed in a layer at least 6 inches thick. Generally, the larger the aggregate, the better • Rock entrance should be at least 50 ft. long: however, longer entrances may be required to adequately clean tires. • Geotextile fabric may be needed under the rock to prevent migration of mud from the underlying soil into the stone. • If tires are cleaned with water, the wash water should be directed to a suitable settling area. • A wash rack installed on the rock pad may make washing more convenient and effective. The wash rack would consist of a heavy grating over a lowered area. The grating may be a prefabricated rack, such as a cattle guard, or it may be constructed o site of structural steel. In any case, the wash rack must be strong enough to support the vehicles that will cross it. • Culvert -A pipe or culvert shall be constructed under the entrance if needed to prevent surface water flowing across the entrance from being directed out on to paved surfaces. • Water Bar -a water bar shall be constructed as part of the construction entrance if needed to prevent surface runoff from flowing the length f the construction entrance and out onto paved surfaces D34 Maintenance: • In addition to the vehicle tracking pad, it is recommended that a street sweeper and scraper be kept on site during construction operations and the street areas adjacent to the tracking pad should be cleaned daily at the end of each construction day. • New rock should be added to the tracking pad whenever the existing rock becomes buried. • If conditions on the site are such that the majority of the mud is not removed by the vehicles traveling over the gravel, then the tires of the vehicles should be washed before entering a public road. • Wash water should be carried way from the entrance to a settling area to remove sediment; a wash rack may also be used to make washing more convenient and effective. • The rock entrance pad needs maintenance to prevent racking of mud onto paved roads. This may require periodic top -dressing with additional rock or removal and reinstallation of the pad. Areas used for sediment trapping may also need to be cleaned out. • Top dressing of additional stone shall be applied as conditions demand. Mud spilled, dropped, washed or tracked onto public roads, or any surface where runoff is not checked by sediment controls, shall be removed immediately. • The rock pad needs occasional maintenance to prevent the tracking of mud onto paved roads. T his may require periodic topdressing with addition rock or removal and reinstallation of the pad. Sources: 1. Minnesota Pollution Control Agency, 2000, Protecting Water Quality in Urban Areas: Best Management Practices for Dealing with Storm Water Runofffrom Urban, Suburban and developing Areas of Minnesota. Minneapolis. 2. Center for Watershed Protection, 2001. "Stabilized Construction Entrance" fact sheet in Storm water Manager's Resource Center, www.stormwatercenter.net Ellicott City, MD. 3. Mecklenburg, D. 1996. Rainwater and Land Development. Division of Soil and Water Conservation, Ohio Department of Natural Resources. Columbus. 4. Soil Conservation Service. 1987. "Temporary Rock Construction Entrance" fact sheet. United States Department of Agriculture, Washington, D.C. 5. Minnesota Department of Transportation. 2000. Standard Specifications for Construction. St. Paul. D35 Riprap rundown Ii Snottily V-shaped Riprap Channel blend contact area Design top width — cross-section Finished channel . _ Design "'fel II- 00mPa 40SPOP-4101 If lfl i1 til ill MI ii=,1lt1 Trapezoidal Riprap Channel G i I I llt" l� l tttr Subgrade excavation Biter fabric or aggregate filter -4---- Design top width _......... ;_ .. Design depth •� f j !1111-�R �i+w �1w;*+��.a_ w�� :• "L17 �l��l r111 .�r.aia..�r0lr.� �ifii.�'.lil% 11181.- lliI n kiiifli =#1111 111 11/fi=11111—t0 IIIMP Fabric or filter layer Figure 6. Typical riprap-lined channel cross-sections. (Source: Ref. 1) Description and Purpose Lined channels are excavated channels or swales lined with grass, riprap, or other protective material. They are intended to carry concentrated runoff to a stable outlet without causing erosion or flooding. In some cases they are designed to allow runoff to infiltrate into the surrounding soil (Figure 6). Design and Installation Grass -lined channels may have V-shaped, parabolic, or trapezoidal cross-sections. Side slopes should not exceed 3:1 to facilitate the establishment, maintenance, and mowing of vegetation. A dense cover of hardy, erosion -resistant grass should be established as soon as possible following grading. This may necessitate the use of straw mulch and the installation of protective netting until the grass becomes established (see BMP 2.2, Mulching and Matting). If the intent is to create opportunities for runoff to infiltrate into the soil, the channel gradient should be kept near zero, the channel bottom must be well above the seasonal water table, and the underlying soils should be relatively permeable (generally, with an infiltration rate greater than 2 cm per hour). D36 Riprap-lined channels may be installed on somewhat steeper slopes than grass -lined channels. They require a foundation of filter fabric or gravel under the riprap. Generally, side slopes should not exceed 2:1, and riprap thickness should be 1.5 times the maximum stone diameter. Riprap should form a dense, uniform, well -graded mass. Applicability, Limitations, and Common Problems A limitation of lined channels is that they tend to take up substantial land area on a site. Where land is expensive they may not be a cost-effective solution. Grass -lined channels typically are used in residential developments, along highway medians, or as an alternative to curb and gutter systems. Grass -lined channels should be used to convey runoff only where slopes are 5% or less. They require periodic mowing, occasional spot -seeding, and weed control to ensure adequate grass cover. Common problems in grass -lined channels include erosion of the channel before vegetation is fully established and gullying or head cutting in the channel if the grade is too steep. Trees and brush tend to invade grass -lined channels, causing maintenance problems. Riprap lined channels can be designed to safely convey greater runoff volumes on s ome-what steeper slopes. However, they should generally be avoided on slopes exceeding 10%. Common problems include stone displacement or erosion of the foundation, or channel overflow and erosion because the channel is not large enough. Channels established on slopes greater than 10% will usually require protection with rock gabions, concrete, or other highly stable and protective surface. Riprap rundown information obtained from: http://vvwvv.cep.unep.org/pubs/Techreports/tr32en/content.html D37 FLUMED CROSSING / DRY CROSSING CONSTRUCTION R.O.W. PROPOSED PIPELINE SPOIL PILE SILT FENCE AND/GR HAY BALES - AS APPROPRIATE r STREAM FLAW TRENCH TEMPORARY TRENCH PLUG EXISTING VEGETATION MAINTAINED TO MAX, POSSIBLE WIDTH Fung E0 0 a PIPE(S) • EQUIPMENT " ��■ CROSSING ■ :■■■■■■■■■ • ■ SILT FENCE - AND/OR 2Y HALES APPROPRIATE SPOIL PILE TEMPORARY TRENCH PLUG TEMPORARY DAN (SANDBAGS) STAKED HAY BALES; SANDBAGS DR SILT FENCE TEMPORARY DAM (SANDBAGS) SANDBAGS CROSS SECTION FOR TRENCH F'LUMING Figure 8. 18. Flumed crossing / dry crossing detail. STREAii FLO r . Wetland Crossing Detail PROPOSED PIPELINE SPOIL P [LE SILT FENCE AND/OR HAY BALES 4-- AS APPROPRIATE NE - 1E -- NE- 4- 4 - IL JL NE. SILT FENCE JairvoR BALES APPROPRIATE TRENCH EXISTING VE GETATION MAINTAINED TO MAX. POSSIBLE WIDTH TEL( F ()FURY ri TRENCH PLUG 1 FLUME PIPE(S) EQUIP/4EN1 El. •bCROSSING • oniumma • SPOIL PILE I 1 1 1 IIII111111 WETLAND souNDARY 1[11(111111 1.1 STAKED FLAY BALES\ SANDBAGS OR SILT FEN CE TEMPORARY DAM (SANDBAGS) CONSTRUCTION R.0 .W. SANDBAGS CROSS SECTION FOR TRENCH FLUMING TEMPORARY DAM (SANDRA GS STREAM FLOW Appendix E Seed Mix MENU -BASED SEED MIXES BY HABITAT TYPE FOR USE IN INTERIM AND FINAL RECLAMATION Low -Elevation Salt -Desert Scrub/Basin Bi Sagebrush Common Name Scientific Names Variety Season Form PLS lbs/acre* Plant Both of the Following (5% Each, 10% Total) Fourwing Saltbush Atriplex canescens VNS Shrub 2.5 Shadscale Atriplex confertifolia VNS Shrub 2.0 and Two of the Following (25% Each, 50% Total) Bottlebrush Squirreltail Elymus elymoides, Sitanion hystrix VNS Cool Bunch 3.4 Streambank Wheatgrass Elymus lanceolatus ssp. psammophilus, Agropyron riparium Sodar Cool Sod -forming 4.2 Bluebunch Wheatgrass Pseudoroegneria spicata Secar Cool Bunch 4.7 and One of the Following (20% Total) Indian Ricegrass Achnatherum [Oryzopsis] hymenoides Paloma, Rimrock Cool Bunch 3.7 Sandberg Bluegrass Poa sandbergii, Poa secunda VNS Cool Bunch 0.6 and One of the Following (10% Total) Alkali Sacaton Sporobolus airoides VNS Warm Bunch 0.15 Salina Wildrye Leymus salinus VNS Cool Bunch 1.0 and One of the Following (10% Total) Galleta Pleuraphis [Hilaria] jamesii Viva florets Warm Bunch/Sod-forming 1.6 Sand Dropseed Sporobolus cryptandrus VNS Warm Bunch 0.05 *Based on 60 pure live seeds (PLS) per square foot, drill -seeded. Double this rate (120 PLS per square foot) if broadcast or hydroseeded. Pinyon -Juniper Woodland and/or Mountain/Wyoming Big Sagebrush Shrubland Common Name Scientific Names Variety Season Form PLS lbs/acre* Plant Both of the Following (15% Each, 30% Total) Bottlebrush Squirreltail Elymus elymoides Sitanion hystrix VNS Cool Bunch 2.0 Bluebunch Wheatgrass Pseudoroegneria spicata, Agropyron spicatum Secar, P-7, Anatone, Goldar Cool Bunch 2.8 and Two of the Following (20% Each, 40% Total) Thickspike Wheatgrass Elymus lanceolatus ssp. lanceolatus, Agropyron dasystachyum Critana, Bannock, Schwendimar Cool Sod -forming 3.4 Slender Wheatgrass Elymus trachycaulus, Agropyron trachycaulum Revenue, Pryor Cool Bunch 3.3 Western Wheatgrass Pascopyrum [Agropyron] smithii Rosana, Arriba Cool Sod -forming 4.8 and Two of the Following (15% Each, 30% Total) Indian Ricegrass Achnatherum [Oryzopsis] hymenoides Paloma, Rimrock Cool Bunch 2.8 Galleta Pleuraphis [Hilaria] jamesii Viva florets Warm Bunch/Sodforming 2.5 Muttongrass Poa fendleriana VNS Cool Bunch 0.4 Sandberg Bluegrass Poa sandbergii, Poa secunda VNS Cool Bunch 0.4 *Based on 60 pure live seeds (PLS) per square foot, drill -seeded. Double this rate (120 PLS per square foot) if broadcast or hydroseeded. Mixed Mountain Shrubland, Including Oakbrush Common Name Scientific Names Variety Season Form PLS lbs/acre* Plant Both of the Following (20% Each, 40% Total) Bottlebrush Squirreltail Elymus elymoides Sitanion hystrix VNS Cool Bunch 2.7 Bluebunch Wheatgrass Pseudoroegneria spicata, Agropyron spicatum Secar, P-7, Anatone, Goldar Cool Bunch 3.7 and Two of the Following (15% Each, 30% Total) Thickspike Wheatgrass Elymus lanceolatus ssp. lanceolatus, Agropyron dasystachyum Critana, Bannock, Schwendimar Cool Sod -forming 2.5 Slender Wheatgrass Elymus trachycaulus, Agropyron trachycaulum Revenue, Pryor Cool Bunch 2.5 Western Wheatgrass Pascopyrum [Agropyron] smithii Rosana, Arriba Cool Sod -forming 3.6 and One of the Following (10% Total) Big Bluegrass Poa ampla Sherman Cool Bunch 0.3 Canby Bluegrass Poa canbyi, P. secunda Canbar Cool Bunch 0.3 Muttongrass Poa fendleriana VNS Cool Bunch 0.3 and One of the Following (10% Total) Letterman Needlegrass Achnatherum [Stipa] lettermanii VNS Cool Bunch 1.7 Columbia Needlegrass Achnatherum [Stipa] nelsonii, Stipa columbiana VNS Cool Bunch 1.7 Green Needlegrass Nassella [Stipa] viridula Lodorm, Cucharas Cool Bunch 1.4 and One of the Following (10% Total) Indian Ricegrass Achnatherum [Oryzopsis] hymenoides Paloma, Rimrock Cool Bunch 1.9 Junegrass Koeleria macrantha, K. cristata VNS (North American Origin) Cool Bunch 0.1 *Based on 60 pure live seeds (PLS) per square foot, drill -seeded Double this rate (120 PLS per square foot) if broadcast or hydroseeded. Spruce -Fir Forest, Including Mountain Meadows Common Name Scientific Names Variety Season Form PLS lbs/acre* Plant Both of the Following (20% Each, 40% Total) Mountain Brome Bromopsis [Bromus] marginatus Garnet , Bromar Cool Bunch 5.8 Slender Wheatgrass Elymus trachycaulus, Agropyron trachycaulum Revenue, Pryor Cool Bunch 3.3 and Two of the Following (15% Each, 30% Total) Letterman Needlegrass Achnatherum [Stipa] lettermanii VNS Cool Bunch 2.6 Blue Wildrye Elymus glaucus VNS Cool Bunch 3.6 Idaho Fescue Festuca idahoensis Joseph, Nezpurs Cool Bunch 0.9 and Two of the Following (15% Each, 30% Total) Nodding Brome Bromus anomalous VNS Cool Bunch 2.7 Thickspike Wheatgrass Elymus lanceolatus ssp. lanceolatus, Agropyron dasystachyum Critana, Bannock, Schwendimar Cool Sod -forming 2.5 Big Bluegrass Poa ampla Sherman Cool Bunch 0.4 Thickspike Wheatgrass Elymus lanceolatus ssp. lanceolatus, Agropyron dasystachyum Critana, Bannock, Schwendimar Cool Sod -forming 0.4 *Based on 60 pure live seeds (PLS) per square foot, drill -seeded. Double this rate (120 PLS per square foot) if broadcast or hydroseeded. EXAMPLES OF MENU -BASED SEED MIXES BY HABITAT TYPE FOR USE IN TEMPORARY SEEDING Example for Low -Elevation Salt -Desert Scrub/Basin Big Sagebrush, Pinyon -Juniper, and Mountain/Wyoming Sagebrush Common Name Scientific Names Variety Season Form PLS lbs/acre* Plant One of the Following Wheat x Tall Wheatgrass Triticum aestivum x Elytrigia elongata Regreen** Cool Annual 11.9 Wheat x Cereal Rye Triticum aestivum x Secale cereale QuickGuard** Cool Annual 30.2 and the Following Streambank Wheatgrass Elymus lanceolatus ssp. psammophilus, Agropyron riparium Sodar Cool Sod -forming 8.9 Example for Mixed Mountain Shrubland/Oakbrush and Spruce -Fir Forest/Mountain Meadow Common Name Scientific Names Variety Season Form PLS lbs/acre* Plant One of the Following Wheat x Tall Wheatgrass Triticum aestivum x Elytrigia elongata Regreen** Cool Annual 11.9 Wheat x Cereal Rye Triticum aestivum x Secale cereale QuickGuard** Cool Annual 30.2 and Two of the Following Mountain Brome Bromopsis [Bromus] marginatus Garnet, Bromar Cool Bunch 7.7 Thickspike Wheatgrass Elymus lanceolatus ssp. lanceolatus, Agropyron dasystachyum Critana, Bannock, Schwendimar Cool Sod -forming 4.5 Slender Wheatgrass Elymus trachycaulus, Agropyron trachycaulum San Luis Cool Bunch 4.4 *Based on 3 PLS per square foot for Regreen, 9 PLS per square foot for QuickGuard, and 16 PLS per square foot for native perennial grasses (streambank wheatgrass is 32 PLS per square foot). Double the indicated amounts if broadcast or hydroseeded. ** Included as examples only. Product information on alternative sterile hybrids must be submitted to BLMprior to use. Table 1 Site Descriptions Table 1. Site Description- Western Expansion Pipeline 11 Meets requirements of Part 3.5.1. (a) through (h) of the UPDES General Permit, "Storm Water General Permit for Construction Activities...", Permit No. COR300000 ROW Description of Construction activities at the site and final disposition of the site Phased sequence of events—construction to final stabilization Total area of site Actual disturbed acerage Estimate of the runoff coefficient of site Pre -disturbance vegetation type (native veg) Pre -disturbance % of existing vegetative ground cover Location and Description of any other potential pollution sources Location and Description of any anticipated non-stormwater components of the discharge Receiving water(s) and site, type and location of any outfall (acres) (acres) Pipeline ROW construction will consist of clearing and grading, trench and. fill procedures. Phase I: Clearing, grading, trench and fill. Phase II: ROW will be re -seeded, permanent BMPs will be installed to mitigate storm water. Phase III: ROW will be reclaimed, and recontoured to original contours and plant species TBD Pinyon -Juniper, wheatgrasses, Gambel oak, sedges, needleandthread, muttongrass, bluebunch grasses, serviceberry, snowberry, bitterbrush, low rabbitbrush, forbes Any substance(s) included for the maintenance of construction equipment and prefabrication process at any time of the day Substance(s) related to maintenance of construction equipment and prefabrication process Table 1 Site Descriptions REVISION SHEET Review Date Representative/Designee Printed Name Representative/Designee Signature Type of revision (e.g. SWPPP text, site modification, etc.) SWPPP Amended (Y/N) 9/14/2011 Nadia Almuti _=r--= Initial SWPPP Drafting N/A Table 3 Site Specific SWMP Descriptions