The URL can be used to link to this page

Home My WebLink About1.00 General Application Materials_Part18ENGINEERING & LAND SURVEYING UELS, LLC Corporate Office * 85 South 200 East Vernal, UT 84078 * (435) 789-1017 TOPOGRAPHIC MAP10 0 0 ' 50 0 ' 0'10 0 0 ' C O U N T Y R O A D 2 1 1 T6S R 98 W EXISTING LOCATION: SKR #698-10-BV PAD LEGEND WORKING PAD SURFACE OIL & GAS LOCATION (LOD) 2000' OFFSET FROM WORKING PAD SURFACE 2640' OFFSET FROM WORKING PAD SURFACE EXISTING FLOW LINE PROPERTY LINE NOTE: PARCEL DATA SHOWN HAS BEEN OBTAINED FROM VARIOUS SOURCES AND SHOULD BE USED FOR MAPPING, GRAPHIC AND PLANNING PURPOSES ONLY. NO WARRANTY IS MADE BY UINTAH ENGINEERING AND LAND SURVEYING (UELS) FOR ACCURACY OF THE PARCEL DATA. DRAWN BY SURVEYED BY SCALE 1" = 1000'T.L.L.12-14-23 DAYTON SLAUGH 06-29-23 SKR #698-10-BV PADTRACT 72, SECTIONS 10 & 15, T6S, R98W, 6th P.M.GARFIELD COUNTY, COLORADO CHEVRON U.S.A. INC. CHEVRON USA INC CHEVRON USA INC CHEVRON USA INC SECTION LINE S E C T I O N L I N E CL E A R CR E E K R O A D MAHOGANY ENERGY RESOURCES LLC MAHOGANY ENERGY RESOURCES LLC MAHOGANY ENERGY RESOURCES LLC 2000' OFFSET FROM WORKING PAD SURFACE BLM Existing CHEVRON USA INC SKR-66S98W 9SENE Location ID: 336050 2640' OFFSET FROM WORKING PAD SURFACE PROPERTY BOUNDARY 75' N 1201' W Existing CHEVRON USA INC SKR-66S98W 16SENE Location ID: 336052 Existing CHEVRON USA INC SKR-66S98W 10SWSW Location ID: 336056 PRIVAT E ROAD WATER BODIES EXISTING ACCESS ROAD PROPOSED ADDITIONAL ACCESS ROAD WATER WELLS EXISTING OIL/GAS LOCATION Chevron USA Inc Water Well No. 67475-F PROPOSED FLUIDS PIPELINE PROPOSED GAS FLOWLINE CHEVRON USA INC CHEVRON USA INC BLM CHEVRON USA INC CHEVRON USA INC CHEVRON USA INC CHEVRON USA INC CHEVRON USA INC MAHOGANY ENERGY RESOURCES LLC CHEVRON USA INC CHEVRON USA INC CHEVRON USA INC CHEVRON USA INC MAHOGANY ENERGY RESOURCES LLC MAHOGANY ENERGY RESOURCES LLC MAHOGANY ENERGY RESOURCES LLC CHEVRON USA INC BLM CHEVRON USA INC CHEVRON USA INC Existing CHEVRON USA INC SKR-66S98W 22NENW Location ID: 324358 BLM Existing Grand Valley Rural Power Lines, Inc. 20' Wide Permanent Electric Utility Easement Document #798468, Filed: 02/07/2011 Garfield County, Colorado Existing Chevron U.S.A. Inc. 50' Wide Permanent Pipeline Easement Document #710363, Filed: 11/02/2006 Garfield County, Colorado PROPOSED STAGING PAD NOTE: THERE ARE NO MUNICIPAL BOUNDARIES, SUBDIVISION BOUNDARIES, RESIDENTIAL BUILDING UNITS, OCCUPIED BUILDINGS, OR DESIGNATED OUTSIDE ACTIVITY AREAS WITHIN 2000 FEET OF THE PROPOSED LOCATION.REV: 2 04-22-24 T.L.L. (ADD NOTES & UPDATE TO TOPO MAP) CHEVRON USA INC ENGINEERING & LAND SURVEYING UELS, LLC Corporate Office * 85 South 200 East Vernal, UT 84078 * (435) 789-1017 TOPOGRAPHIC MAP - RECORDED EASEMENT 10 0 0 ' 50 0 ' 0'10 0 0 ' T6S R 98 W EXISTING LOCATION: SKR #698-10-BV PAD LEGEND WORKING PAD SURFACE OIL & GAS LOCATION (LOD) 2000' OFFSET FROM WORKING PAD SURFACE 2640' OFFSET FROM WORKING PAD SURFACE EXISTING FLOW LINE PROPERTY LINE DRAWN BY SURVEYED BY SCALE 1" = 1000'T.L.L.12-14-23 DAYTON SLAUGH 06-29-23 SKR #698-10-BV PADTRACT 72, SECTIONS 10 & 15, T6S, R98W, 6th P.M.GARFIELD COUNTY, COLORADO CHEVRON U.S.A. INC. CHEVRON USA INC CHEVRON USA INC SECTION LINE S E C T I O N L I N E C L E A R C R E E K R O A D MAHOGANY ENERGY RESOURCES LLC MAHOGANY ENERGY RESOURCES LLC 2000' OFFSET FROM WORKING PAD SURFACE BLM 2640' OFFSET FROM WORKING PAD SURFACE PROPERTY BOUNDARY 75' N 1201' W Existing CHEVRON USA INC SKR-66S98W 16SENE Location ID: 336052 Existing CHEVRON USA INC SKR-66S98W 10SWSW Location ID: 336056 PRIVATE ROAD WATER BODIES EXISTING ACCESS ROAD PROPOSED ADDITIONAL ACCESS ROAD WATER WELLS EXISTING OIL/GAS LOCATION Chevron USA Inc Water Well No. 67475-F PROPOSED FLUIDS PIPELINE PROPOSED GAS FLOWLINE CHEVRON USA INC CHEVRON USA INC CHEVRON USA INC CHEVRON USA INC CHEVRON USA INC CHEVRON USA INC MAHOGANY ENERGY RESOURCES LLC CHEVRON USA INC CHEVRON USA INC CHEVRON USA INC CHEVRON USA INC MAHOGANY ENERGY RESOURCES LLC MAHOGANY ENERGY RESOURCES LLC BLM CHEVRON USA INC Existing CHEVRON USA INC SKR-66S98W 22NENW Location ID: 324358 BLM Existing Grand Valley Rural Power Lines, Inc. 20' Wide Permanent Electric Utility Easement Document #798468, Filed: 02/07/2011 Garfield County, Colorado Existing Chevron U.S.A. Inc. 50' Wide Permanent Pipeline Easement Document #710363, Filed: 11/02/2006 Garfield County, Colorado SEE SHEET 1 OF 2 REV: 2 04-22-24 T.L.L. (ADD NOTES & UPDATE TO TOPO MAP) PROPOSED STAGING PAD NOTE: THERE ARE NO MUNICIPAL BOUNDARIES, SUBDIVISION BOUNDARIES, RESIDENTIAL BUILDING UNITS, OCCUPIED BUILDINGS, OR DESIGNATED OUTSIDE ACTIVITY AREAS WITHIN 2000 FEET OF THE PROPOSED LOCATION. NOTE: PARCEL DATA SHOWN HAS BEEN OBTAINED FROM VARIOUS SOURCES AND SHOULD BE USED FOR MAPPING, GRAPHIC AND PLANNING PURPOSES ONLY. NO WARRANTY IS MADE BY UINTAH ENGINEERING AND LAND SURVEYING (UELS) FOR ACCURACY OF THE PARCEL DATA. BLM CHEVRON USA INC BLM BLM MAHOGANY ENERGY RESOURCES LLC CHEVRON USA INC APPENDIX P STORMWATER MANAGEMENT PLAN SKINNER RIDGE AND SOUTH CANYON FIELDS SKR 698‐10‐BV Pad Township 6 South, Range 98 West, 6th PM Sections 10 & 15: Tract 72 Garfield County, Colorado STORMWATER MANAGEMENT PLAN FOR CONSTRUCTION ACTIVITIES SKINNER RIDGE AND SOUTH CANYON FIELDS GARFIELD COUNTY, COLORADO Prepared For: Chevron U.S.A. Inc. 760 Horizon Drive, Suite 401 Grand Junction, Colorado 81506 Prepared by: Entrada Consulting Group 330 Grand Avenue, Suite C Grand Junction, Colorado 81501 Project # 018-068 Revised: May 2023 ADMINISTRATIVE LOG SKINNER RIDGE AND SOUTH CANYON CHEVRON U.S.A. INC. Date Training, SWMP Revisions or Updates Comments Dec-2006 SWMP revisions Sep-2007 SWMP revisions Apr-2009 SWMP revisions May-2010 SWMP revisions Mar-2012 SWMP revisions Jul-2013 SWMP re-write SWMP into new format (administrative log added); South Canyon area added Feb-2014 SWMP updates 8" Piceance Interim Sales Pipeline added. SWMP maps, acreage, soils, and vegetation updated. Location of inspection reports and site maps changed to StormPro Max database. Minor revisions to site map section and final stabilization section in narrative. Jun-2014 Sites terminated The following sites were terminated from permit coverage (interim reclamation): 698-22-AV, Deer Gulch Road Sections 1-5, Hiner Gate Field Office, 598-36-1, 30” Pipeline Origin, 598-35-AV, and 598-35-AV Access. Overview map and disturbed acreage updated. Signed amendment form to be added to Appendix A. Dec-2014 Sites terminated/Minor SWMP revisions The following sites were terminated from permit coverage (interim reclamation): 597-EM1 (Mesa Learning Pad), 597-03-AEF Delivery Facility, 598-08-AV & Access, 598-25-4 Compressor Site & Access, 598-25-AV & Access, 598-25-BV, 598-25-CV, 598-35-BV, 598-36-AV Service Pad, 598-36-AV & Access, 598-36- BV, 698-04-AV, 698-09-BV, 698-11-AV, 698-12-AV, 698-12-BV, 698-12-CV, 698- 16-AV, Central Processing Facility, Clear Creek Road Sections 8-15, 30" Export Pipeline, 26-AV Pipeline, and Clear Creek Pipeline. Overview map and disturbed acreage updated. Spill response section revised. Minor revisions throughout SWMP. Docs added to Appendix A. Jun-2020 SWMP updates Overview map and SWMP acreage updated to reflect current disturbances (597- EM1, 598-35 BV, 598-36-1, 698-04 AV, 698-09 BV, 698-16 AV, Man Camp). Colorado Operations Superintendant updated to Scot Olson. SWMP Administrators updated to Chris Patterson and Priscilla Yelvington. Document updated to reflect the changes in the CDPHE permit. Mar-2021 Site added 598-17-AV (3-17 Pad) was added to permit coverage (final reclamation). Nov-2021 Minor SWMP revisions Where possible Appendix D was edited to reflect CDPHE permit verbiage change from “BMP” to “Control Measure”. Some references to “BMP” could not be changed due to document type and as such any remaining references to “BMP” should be assumed to mean “Control Measure”. SWMP Administrator updated to Adriane Gifford. May-2023 SWMP Updates SWMP Administrator updated to Erica Zuniga. Control measure manual updated. CHEVRON U.S.A. INC. Certification Stormwater Management Plan for Skinner Ridge and South Canyon Garfield County, Colorado Entrada Consulting Group has prepared this Stormwater Management Plan for Construction Activities for Chevron U.S.A. Inc. for Skinner Ridge and South Canyon located in unincorporated Garfield County, Colorado. “I certify under penalty of law, that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations.” Signature: Name: Andrew Olson___ Title: Colorado Operations Superintendent Date: May 17, 2023 Chevron U.S.A. Inc. i Entrada Consulting Group Skinner Ridge and South Canyon SWMP Table of Contents INTRODUCTION ............................................................................................................. 1 Stormwater Runoff Permitting Requirements ........................................................................... 1 1. CONSTRUCTION SITE DESCRIPTION ................................................................ 1 1.A Nature of Construction Activity ................................................................................... 1 1.B Sequence of Construction Activities ........................................................................... 2 1.C Estimate of Total Area of Site and Area to be Disturbed ............................................ 5 1.D Soil Data and Erosion Potential ................................................................................. 5 1.E Vegetation Description and Estimate ......................................................................... 8 1.F Potential Pollution Sources and Locations ................................................................. 8 1.G Non-Stormwater Discharges ...................................................................................... 8 1.H Receiving Waters....................................................................................................... 8 2. SITE MAP(S) ......................................................................................................... 9 2. A Construction Site Boundaries .................................................................................... 9 2. B Areas of Ground Disturbance .................................................................................... 9 2. C Areas of Cut and Fill .................................................................................................. 9 2. D Storage Areas ............................................................................................................ 9 2. E Location of Asphalt and Concrete Batch Plants ......................................................... 9 2. F Locations of Structural Control Measures .................................................................. 9 2. G Locations of Non-Structural Control Measures ........................................................... 9 2. H Locations of Springs, Wetlands and Other Surface Waters ........................................ 9 3. STORMWATER MANAGEMENT CONTROLS ................................................... 10 3.A Stormwater Administrator ........................................................................................ 10 3.B Potential Pollutant Sources ...................................................................................... 10 3.C Control Measures for Stormwater Pollution Prevention ............................................ 11 3.C.1 Structural Practices for Erosion and Sediment Control ............................................ 11 3.C.2 Non-Structural Practices for Erosion and Sediment Control (includes wind erosion/dust control) ................................................................................................ 11 3.C.3 Phased Control Measure Installation ....................................................................... 11 3.C.4 Materials Handling and Spill Prevention ................................................................... 12 3.C.5 Dedicated Asphalt or Concrete Batch Plants ........................................................... 13 3.C.6 Vehicle Tracking ...................................................................................................... 14 3.C.7 Waste Management and Disposal, Concrete Washout, and Contaminated Soils ..... 14 3.C.8 Ground Water and Stormwater Dewatering ............................................................. 14 4. FINAL STABILIZATION AND LONG TERM STORMWATER MANAGEMENT . 14 5. INSPECTIONS AND MAINTENANCE PROCEDURES ...................................... 16 Chevron U.S.A. Inc. ii Entrada Consulting Group Skinner Ridge and South Canyon SWMP LIST OF TABLES Table 1 Soils Data and Erosion Potential Table 2 Control Measure Phasing Table 3 Typical Seed Mixture LIST OF FIGURES Figure 1 Project Site Overview Map Part 1 – Skinner Ridge Figure 2 Project Site Overview Map Part 2 – South Canyon LIST OF APPENDICES Appendix A Permit to Discharge: COR-400910, Certification: COR-037787, General Permit: COR-040000, and Related Docs Appendix B NRCS Soils Report and Ecological Site Descriptions Appendix C BLM Gold Book, Chapters 4 & 6 Appendix D Control Measure Manual Appendix E Colorado Revised Statute 34-60-130, Environmental Spill Reporting Brochure, SPCC Plan Narrative Chevron U.S.A. Inc. 1 Entrada Consulting Group Skinner Ridge and South Canyon SWMP INTRODUCTION This Stormwater Management Plan (SWMP) for Construction Activities is written to comply with the Colorado Department of Public Health and Environment’s (CDPHE) General Permit No. COR- 040000, issued on April 1, 2019, to remain in effect pending any updates to said permit by the Water Quality and Control Division, and with related U.S. Environmental Protection Agency (USEPA) National Pollutant Discharge Elimination System (NPDES) stormwater regulations. This SWMP addresses construction activities associated with Chevron U.S.A. Inc. (Chevron)’s natural gas exploration and production activities at the Skinner Ridge and South Canyon fields, in Garfield County, Colorado. A copy of the certification to discharge (COR-037787), current permit to discharge, the Colorado Discharge Permit System (CDPS) general permit (COR-040000), and any related documentation can be found in Appendix A. This SWMP is intended to be revised as necessary to address planned developments, new disturbances, and other changes required to manage stormwater and protect surface water quality. These changes shall be documented in the Administrative Log located at the front of this document. Stormwater Runoff Permitting Requirements The Federal Clean Water Act [Section 402(p)] requires that discharges of pollutants to waters of the U.S. from any point source be regulated by NPDES permits. In November 1990 the USEPA published final regulations that established application requirements for stormwater associated with construction activity for soil disturbances of 5 acres or more be regulated as an industrial activity and covered by an NPDES permit. In December 1999 the USEPA published final Phase II NPDES regulations that established application requirements for stormwater 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. On June 30, 2005, Colorado stormwater regulations went into effect to require CDPS permits for stormwater discharges from construction activities for oil and gas activities (1 acre or greater). Federal permit coverage for these discharges was conditionally exempted from the Federal Clean Water Act by the 2005 Federal Energy Bill. On February 1, 2006, the CDPHE issued a letter clarifying that the CDPHE Water Quality Control Commission decided to maintain the existing requirements for stormwater permitting for oil and gas construction sites greater than 1 acre. 1. CONSTRUCTION SITE DESCRIPTION The Skinner Ridge field is located in sections of townships 5 and 6 south, range 97 west; townships 4 through 7 south, range 98 west; and township 6 south, range 99 west of the 6th principal meridian in Garfield County. De Beque, Colorado is the nearest population center. The South Canyon field is located in section 35, township 6 south, range 104 west; sections 2, 23, and 27, township 7 south, range 104 west; and section 12, township 8 south, range 105 west. Mack, Colorado is the nearest population center. The project areas encompass approximately 44,770 acres and include well pads, pipelines, and access roads. See Figures 1 and 2 for the project site overview maps. 1.A Nature of Construction Activity The scope of construction activity associated with the project site is varied and may include but is not limited to: Chevron U.S.A. Inc. 2 Entrada Consulting Group Skinner Ridge and South Canyon SWMP • Drilling and re-drilling wells to enhance production, which includes the construction of vehicle access roads, and flow lines. • Pipeline repair, replacement, and new installations, including water gathering, gas gathering, crude gathering, water injection, gas injection, and liquid hydrocarbon product lines. These projects often involve stream crossings. • Surface facility upgrades and installation, which may include the installation of tanks, separators, heater treaters, valve manifolds, or other equipment typical of oil production activities. • Road repair and construction, which may include the repair, replacement or new installation of bridges, culverts, and other structures associated with the construction of low volume roads. • Location reclamation of past projects, including pit remediation, well location reclamation and other environmental mitigation measures. Construction at Skinner Ridge and South Canyon is performed using conventional cut and fill earthmoving techniques and trenching. At this time, the majority of the locations are in the interim reclamation phase, as described in Section 1B. As vegetation fills in sufficiently and the disturbances meet the final stabilization requirements in Section 4, they will be removed from permit coverage until they are re-disturbed for final stabilization, site working area reduction or for other reasons. As long as the permit certification is active, any new disturbances within the project site boundaries will be covered under the permit and SWMP. Reserve pits may be constructed for use during operations to contain drilling fluids and cuttings. The pits will be designed, constructed, and reclaimed according to COGCC requirements. In areas that are disturbed by construction, topsoil will be stripped and stockpiled near the site. All brush, limbs, and other woody material will be stockpiled separately from the topsoil. Soil materials will be managed so that erosion and sediment transport are minimized. Nearby drainages will be protected by appropriate measures. If a well is not productive, it will be plugged and abandoned in accordance with COGCC rules, and the pad area will be reclaimed to approximate pre-construction contours and seeded. Construction and reclamation activities will also be completed, if and where appropriate, in accordance with BLM Gold Book Chapters 4 and 6, which are included as Appendix C. 1.B Sequence of Construction Activities The development of a natural gas well is generally accomplished in six work phases. They include Access Road and Pad Construction, Well Drilling, Well Completion, Production, Interim Reclamation, and Final Reclamation. Each work phase is briefly discussed below, and the best management practices (Control Measures) are discussed in Section 3.C. Access Road and Pad Construction Pad and access road construction will be performed using traditional cut and fill construction. Size and maintenance requirements for each access road are based on road location and traffic level. Reserve pits may be constructed on the pads at this time to store certain fluids and solids during drilling and completion operations. No fluids or solids, excluding any accumulated stormwater, will be stored in the reserve pits during this phase. Basic construction activities that are conducted during this phase include clearing and grubbing, segregation of topsoil for use in reclamation, grading and excavation, compaction, final grading and contouring, and installation of surfacing materials such as gravel. To the extent possible, Chevron U.S.A. Inc. 3 Entrada Consulting Group Skinner Ridge and South Canyon SWMP Control Measures that will be utilized to control stormwater throughout the life of the facility will be constructed during this phase. Potential sources of pollution for this phase of construction are: sediment discharge, vehicle tracking, disturbed and stored soils, loading and unloading of excavated soils, significant dust or particulate generating processes and vehicle and equipment fueling and maintenance. More information on these potential pollutants is included in Section 3.B. Well Drilling The Well Drilling phase includes the drilling of one or more wells at each location. Activities associated with the drilling phase may include: · Mobilization of the drilling rig and associated equipment, including generators and drilling- mud handling equipment. In some instances, a smaller drilling rig may be used to drill the initial stages of each well prior to the larger drilling rig mobilizing to the location. · Installation of storage, office and housing trailers · Storage of down hole chemicals, fuels and lubricants · Installation of potable water tanks and sewage-handling equipment (e.g., portable toilets or sewage vaults) · Well drilling activities including the installation and cementing of well casing. · Demobilization of the drilling rig and all other equipment at the completion of this phase Potential sources of pollution during this phase of construction are sediment discharge, vehicle tracking, unused and used chemicals, petroleum products and drilling water/mud, vehicle and equipment maintenance and fueling, non-industrial waste such as worker trash and portable toilets, outdoor storage activities and the management of contaminated soils. More information on these potential pollutants is included in Section 3.B. Drilling mud and water will be used to maintain appropriate down hole pressures and lubrication. Unused fresh water and mud chemicals will be stored on the pad. Used materials will either be discharged to the reserve pit or captured in tanks during closed-loop drilling processes. Petroleum products are used for the duration of the drilling process to fuel or lubricate equipment and include fuel, gear oil, hydraulic oil, brake fluid, and grease. Materials to be used to cement casing placed in the well may also be stored and prepared on location or may be transported to the site. Drilling activity in the Skinner Ridge and South Canyon fields has not occurred in some time and there are no current plans to recommence drilling activities in the future. Well Completion The Well Completion phase may include hydraulic fracturing (fracking), cementing, and other processes that stimulate the well and prepare it for production. The basic activities that are conducted during this phase include: · Mobilization of equipment required for well completion · Storage of down hole chemicals, fuels and lubricants · Installation of potable water tanks and sewage-handling equipment (e.g., portable toilets or sewage vaults) or continued maintenance of such equipment installed during the drilling phase Chevron U.S.A. Inc. 4 Entrada Consulting Group Skinner Ridge and South Canyon SWMP · Fracking and other well-stimulation processes · Drill out of any plugs placed during well completion with a work-over rig · Flowback of the well to remove frac water, sand and other impurities · Demobilization of equipment when this phase has been completed Potential sources of pollution during this phase of construction are sediment discharge, vehicle tracking, unused and used chemicals, petroleum products and drilling water/mud, vehicle and equipment maintenance and fueling, non-industrial waste such as worker trash and portable toilets, outdoor storage activities and the management of contaminated soils. More information on these potential pollutants is included in Section 3.B. Several temporary facilities/structures will be placed on site during this phase. These will include: frac trucks, storage and office trailers, generators, and frac tanks. During completions, certain chemicals may be used to stimulate the formation for the extraction of natural gas. Unused water and chemicals will be stored on the pad. Used water will be stored in the reserve pit, recycled, or used in other operations. As equipment is demobilized at the completion of this phase, the well pad and surrounding areas will be carefully inspected to identify any spills or leaks that may have occurred so that those areas can be remediated prior to initiation of the production phase. Interim Reclamation The Interim Reclamation phase includes the contouring of the majority of the pad to a smaller area. The reduced area will be utilized for long-term production and ongoing routine maintenance of the well(s). In general, this phase includes contouring of the site, spreading of topsoil on contoured areas and seeding those areas. Potential sources of pollution for this phase of construction are sediment discharge, vehicle tracking, disturbed and stored soils, loading and unloading of excavated soils, produced fluids, production chemicals, outdoor storage activities, significant dust or particulate generating processes and vehicle and equipment fueling and maintenance. More information on these potential pollutants is included in Section 3.B. After interim reclamation and during the production phase, permit coverage may be inactivated for oil and gas construction sites even if stabilized unpaved surfaces exist and/or disturbed land that has been restored to cropland remains non-vegetated, as long as construction activities have been completed and all other disturbed areas are re-vegetated. Production The Production phase includes the installation of long-term facilities such as permanent well heads, storage tanks, oil and natural gas processing equipment, flow measurement equipment, and any associated flow lines needed to produce natural gas from the formation. Pipeline installation or any required maintenance work is generally accomplished by trenching. The area of disturbance for each pipeline project is determined by location, pipeline size, and the scope of the work being done. Potential sources of pollution for this phase of construction are sediment discharge, vehicle tracking, produced fluids, production chemicals, outdoor storage activities and Chevron U.S.A. Inc. 5 Entrada Consulting Group Skinner Ridge and South Canyon SWMP vehicle and equipment fueling and maintenance. More information on these potential pollutants is included in Section 3.B. Procedures will also be implemented for prompt containment and remediation of any spills that may occur during the production phase. These procedures are outlined in Chevron’s Skinner Ridge Spill Prevention Control and Countermeasures (SPCC) plan. The relevant pages of this document are included in Appendix E. As production activities continue during this phase the well pad and surrounding areas will be carefully inspected to identify any spills or leaks that may have occurred so that those areas can be remediated. Final Reclamation When the production of a well is exhausted, it will be plugged and abandoned. Upon well exhaustion each borehole will be plugged, capped, and all surface equipment will be removed. Subsurface pipelines will be removed to specified locations or abandoned in place as per COGCC Rule 1103. The pad area will be reclaimed by contouring disturbed soils to conform to the surrounding terrain redistributing the stockpiled topsoil, seeding disturbed soil areas in order to reestablish cover vegetation, and construction of any permanent erosion and sediment control structures as needed. Potential sources of pollution for this phase of construction are: sediment discharge, vehicle tracking, disturbed and stored soils, loading and unloading of excavated soils, outdoor storage activities, significant dust or particulate generating processes and vehicle and equipment fueling and maintenance. More information on these potential pollutants is included in Section 3.B. No chemicals or fuels will be stored on site during this phase; however, attention will be paid to the potential for leaks that might occur during the use of construction equipment. 1.C Estimate of Total Area of Site and Area to be Disturbed The total project site covers approximately 44,440 acres. Many locations within the project site have been finally stabilized or have completed interim reclamation and are no longer active under this SWMP. The total disturbance area for active locations within the project site is currently approximately 300 acres. As projects are removed from permit coverage and/or new disturbances are added, the disturbed acreage will be updated to reflect the changes. 1.D Soil Data and Erosion Potential Runoff characteristics are based primarily on-site topography, soil type, and vegetative cover. The major soil types for the construction areas are: Biedsaw-Sunup gravelly loams, 10 to 40 percent slopes; Cameo fine sandy loam, 1 to 6 percent slopes; Cumulic Haploborolls, 1 to 3 percent slopes; Debeque very channery loam, 5 to 20 percent slopes; Grobutte very channery loam, 30 to 60 percent slopes; Happle very channery sandy loam, 3 to 12 percent slopes; Happle very channery sandy loam, 12 to 25 percent slopes; Happle-Rock outcrop association, 25 to 65 percent slopes; Northwater-Adel complex, 5 to 50 percent slopes; Parachute-Irigul complex, 5 to 30 percent slopes; Torriorthents, cool-Rock outcrop complex, 35 to 90 percent slopes; Tosca channery loam, 25 to 80 percent slopes; Trail loamy sand, 1 to 5 percent slopes; and Wrayha- Rabbitex-Veatch complex, 45 to 65 percent slopes. The major soil types at the construction areas are well drained soils with a very low to very high (~1.3 inches to ~26.7 inches) water holding capacity. A Natural Resources Conservation Services (NRCS) Soils Report for the dominant soils in the project site is provided in Appendix B. Chevron U.S.A. Inc. 6 Entrada Consulting Group Skinner Ridge and South Canyon SWMP The k-factor approximates soil detachment due to runoff and raindrop impact. Lower K-Factor values (0.1 – 0.17) indicate less susceptibility to sheet and rill erosion, while higher K-Factor values (>0.30) indicate greater susceptibility to erosion. The Hydrologic Group describes soil and soil units with the potential for runoff under similar storm and cover conditions. Group A has a high infiltration rate and a corresponding lower potential for runoff, while Group D has low infiltration rates due to finer soil texture or a high-water table, giving them a high potential for runoff. The average annual precipitation is approximately 16.45 inches for Skinner Ridge (Western Regional Climate Center Altenbern station 050214) and 9.25 inches for South Canyon (Western Regional Climate Center Fruita station 053146). Table 1 shows the soils data and erosion potential for the soil types in the construction areas, listed by acreage of the soil survey area of interest (AOI). Chevron U.S.A. Inc. 7 Entrada Consulting Group Skinner Ridge and South Canyon SWMP Table 1 - Soils Data and Erosion Potential Skinner Ridge Soil Name Hydrologic Group K- factor Representative Value Acreage in AOI % Sand % Silt % Clay Happle-Rock outcrop association 33.9 Happle B 0.28 65.1 18.9 16.0 Rock outcrop D - - - - Happle very channery sandy loam 20.2 Happle B 0.28 65.1 18.9 16.0 Tosca channery loam 10.7 Tosca B 0.28 44.3 40.7 15.0 Cumulic Haploborolls 10.4 Cumulic haploborolls B 0.17 57.0 18.0 25.0 Grobutte very channery loam 9.7 Grobutte B 0.28 38.5 36.5 25.0 Biedsaw-Sunup gravelly loams 4.9 Biedsaw C 0.37 39.2 37.3 23.5 Sunup D 0.37 39.8 37.7 22.5 Parachute-Irigul complex - Parachute C 0.20 42.1 37.9 20.0 Irigul D 0.28 39.8 37.7 22.5 Debeque very channery loam 1.4 Debeque B 0.28 42.1 37.9 20.0 Wrayha-Rabbitex-Veatch complex 1.0 Wrayha D 0.24 67.2 15.3 17.5 Rabbitex B 0.24 41.6 37.4 21.0 Veatch B 0.28 44.3 40.7 15.0 Northwater-Adel complex - Northwater B 0.28 43.0 38.5 18.5 Adel B 0.20 35.4 33.6 31.0 Chevron U.S.A. Inc. 8 Entrada Consulting Group Skinner Ridge and South Canyon SWMP South Canyon Soil Name Hydrologic Group K- factor Representative Value Acreage in AOI % Sand % Silt % Clay Cameo fine sandy loam 9.8 Cameo B 0.28 62.8 26.2 11.0 Torriorthents, cool-Rock outcrop complex 4.7 Torriorthents, cool D 0.37 39.8 37.7 22.5 Rock outcrop D - - - - Trail loamy sand 1.8 Trail A 0.20 84.3 9.2 6.5 1.E Vegetation Description and Estimate Native plant species for the Skinner Ridge area include: bluebunch wheatgrass, galleta, Indian ricegrass, bottlebrush squirreltail, other perennial forbs, Mormon tea, needleandthread, Sandberg bluegrass, Wyoming big sagebrush, western wheatgrass, Great Basin wildrye, basin big sagebrush, mountain big sagebrush, muttongrass, other shrubs, prairie Junegrass, Gambel oak, other perennial grasses, true mountain mahogany, yellow rabbitbrush, shadscale saltbush, Saskatoon serviceberry, elk sedge, mountain brome, mountain snowberry, slender wheatgrass, Columbia needlegrass, nodding brome, blue wildrye, grouse whortleberry, heartleaf arnica, and silvery lupine. Vegetative ground cover is approximately 80 percent. Native plant species for the South Canyon area include alkali sacaton, fourwing saltbush, basin big sagebrush, galleta, Great Basin wildrye, Gambel oak, other perennial grasses, Indian ricegrass, mountain big sagebrush, Saskatoon serviceberry, western wheatgrass, Wyoming big sagebrush, greasewood, inland saltgrass, and bottlebrush squirreltail. Vegetative ground cover is approximately 50 to 90 percent. For more vegetation information, see the NRCS Vegetative Productivity information included in Appendix B. 1.F Potential Pollution Sources and Locations The potential pollution sources for each phase of construction are briefly discussed in Section 1.B Sequence of Construction Activities. They are discussed in more detail in Section 3.B Potential Pollutant Sources. The locations of all potential pollution sources are shown on the site maps. 1.G Non-Stormwater Discharges Non-stormwater discharges are not expected from the construction project. 1.H Receiving Waters Skinner Ridge and South Canyon lie within the Colorado River watershed. Clear Creek, along with some of its named and unnamed tributaries, is the major receiving water for Skinner Ridge. Clear Creek flows to Roan Creek, Clear Creek Ditch, and some unknown ditches or streams at the south end of the project site. However, the northeast section of the northeast branch of the project site drains to the West Fork of Parachute Creek and some of its tributaries. Roan Creek and Parachute Creek terminate at the Colorado River. West Salt Creek and Prairie Canyon are the receiving waters for South Canyon. These streams flow to Salt Creek, which terminates at the Colorado River. Figures 1 and 2 show the receiving waters for the project site. Chevron U.S.A. Inc. 9 Entrada Consulting Group Skinner Ridge and South Canyon SWMP 2. SITE MAP(S) The site maps for Skinner Ridge and South Canyon will be maintained within the StormPro Max online database. The maps will be regularly updated to reflect all changes to the sites. 2. A Construction Site Boundaries For an accurate representation of the construction site boundaries, refer to the site maps. 2. B Areas of Ground Disturbance For an accurate representation of the areas of ground disturbance, refer to the site maps. 2. C Areas of Cut and Fill For an accurate representation of the areas of cut and fill, refer to the site maps. 2. D Storage Areas For an accurate representation of the storage areas, refer to the site maps. 2. E Location of Asphalt and Concrete Batch Plants Asphalt or concrete batch plants are not anticipated within the project site, but, if used, will be included on the site maps. 2. F Locations of Structural Control Measures For an accurate representation of the location of structural control measures, refer to the site maps. 2. G Locations of Non-Structural Control Measures For an accurate representation of the location of non-structural control measures, refer to the site maps. 2. H Locations of Springs, Streams, Wetlands and Other Surface Waters For an accurate representation of the location of springs, streams, wetlands and other surface waters, refer to Figures 1 and 2. Surface waters that fall within the extent of each site map should also be shown on that map. Chevron U.S.A. Inc. 10 Entrada Consulting Group Skinner Ridge and South Canyon SWMP 3. STORMWATER MANAGEMENT CONTROLS 3.A Stormwater Administrator The SWMP Administrators for Chevron - Skinner Ridge and South Canyon is: Erica Zuniga Lead Environmental Specialist Chevron Rockies Business Unit 2115 117th Avenue Greeley, CO 80634 Office: 970-304-5425 Mobile: 970-278-6934 EricaZuniga@chevron.com The SWMP Administrator is responsible for developing, implementing, maintaining and revising the SWMP as necessary. The administrator may delegate the SWMP preparation, inspections and maintenance of records to qualified personnel (such as a Qualified Stormwater Manager). 3.B Potential Pollutant Sources Disturbed and stored soils: The construction activities will involve soil disturbances and stockpiling. Clearing, grading, and otherwise altering previously undisturbed land can greatly increase the rate of soil erosion over pre-disturbance rates. The resulting sediment can impact the water quality of receiving streams. Vehicle tracking of sediments: Vehicles will be accessing the sites up until the Final Reclamation phase. This also has the potential to facilitate the movement of sediment off site. Management of contaminated soils: If a spill of any type were to occur, the impacted soil would become a potential stormwater pollutant. Loading and unloading operations: The sites may have tanks for the storage of fuels or production-related liquids. The presence of such tanks would require loading and unloading of the tanks. Construction materials and the exploration and production related materials discussed in this SWMP will also require loading and unloading throughout the project. Outdoor storage activities: The construction contractor will maintain a laydown or staging area for equipment and material storage at the active construction site. Depending on the work phase of the site, chemicals and/or other drilling materials may be stored at the construction site, and tanks used to store fuels or production-related liquids may be present. These storage activities are discussed in more detail in Section 1.B Sequence of Construction Activities. Vehicle and equipment maintenance and fueling: During construction, it is possible that equipment will be maintained or fueled on site. On-site maintenance and fueling could potentially result in leaks or spills of fuel, gear oil, hydraulic oil, brake fluid, or grease. Significant dust or particulate generating processes: Construction activities and vehicle traffic to and from the sites could potentially generate dust. Routine maintenance activities: The use of fertilizers or weed killers is possible at the sites in order to achieve successful revegetation of disturbed areas. See also “vehicle and equipment maintenance and fueling” above. Chevron U.S.A. Inc. 11 Entrada Consulting Group Skinner Ridge and South Canyon SWMP On-site waste management practices: Trash receptacles will be located on site to contain construction-related or other trash or debris. Used drilling mud and water will be discharged to the reserve pit or captured in tanks during closed-loop drilling processes. Portable toilets may be utilized on site. Concrete truck/equipment washing: Concrete truck or equipment washing is not anticipated. Dedicated asphalt and concrete batch plants: Dedicated asphalt and concrete batch plants are not anticipated. Non-industrial waste sources: All project phases involve people working on site. This can generate personal and work-related trash and debris and may also necessitate the use of portable toilets. Clearing operations may also generate waste in the form of slash (trees, brush, etc.). Other areas or procedures: No other areas or procedures where spills can occur are anticipated at this time. The locations of potential pollutant sources are shown on the site maps. Control measures utilized to address potential pollutant sources are described in Section 3.C below. 3.C Control Measures for Stormwater Pollution Prevention This section describes the control measures that will be used at Skinner Ridge and South Canyon for stormwater pollution prevention. Chevron’s Control Measure Manual containing the control measures which may be implemented is included in Appendix D. Control Measures may be added or removed from the manual to accommodate changes in site conditions and activities at Skinner Ridge and South Canyon. 3.C.1 Structural Practices for Erosion and Sediment Control Descriptions, design and installation practices, and maintenance and removal considerations for the structural control measures available for use can be found in the Control Measure Manual (Appendix D). The location of all structural control measures will be found on the site maps available in the StormPro Max database. 3.C.2 Non-Structural Practices for Erosion and Sediment Control (includes wind erosion/dust control) Descriptions, design and installation practices, and maintenance and removal considerations for the non-structural control measures available for use can be found in the Control Measure Manual (Appendix D). The location of all non-structural practices will be found on the site maps available in the StormPro Max database. 3.C.3 Phased Control Measure Installation Control measure implementation will be coordinated with the various stages of construction. Control measures to control erosion and sediment transport will be installed prior to earth disturbing activities in an area where practicable, with consideration given to worker safety and access. If additional areas are disturbed, control measures will be implemented prior to the start of ground disturbing activities in those areas where practicable. Additional structural control measures will likely be installed during construction. As portions of the site are completed and previously disturbed areas are stabilized or the control measure is no longer needed to prevent potential pollution, the control measure will be removed from the location. Permanent or temporary erosion control measures for all slopes, channels, ditches, disturbed land area, and soil stockpiles will be implemented as soon as practicable after final grading, or the final ground disturbance has been completed. When it is not possible to permanently Chevron U.S.A. Inc. 12 Entrada Consulting Group Skinner Ridge and South Canyon SWMP stabilize a disturbed area after construction has been completed or where significant ground disturbance activity ceases, temporary erosion control measures will be implemented as soon as practicable. Table 2 below outlines the typical control measure phasing to take place at each area of disturbance. Table 2 – Control Measure Phasing Project Phase Control measures to be implemented during each phase Pre-Disturbance/Site Preparation • Limit access to areas that are not to be disturbed. • Install vehicle tracking controls where planned. • Install planned run-on/run-off controls prior to disturbance where possible. Construction • Locate stockpiles within planned work areas and with perimeter control measures. • Continue installing all planned control measures as soon as practicable for each area. • Leave disturbed area of site in a surface roughened condition when feasible. • Protect, inspect and repair control measures. Post-construction • Inspect, maintain, and repair control measures installed during previous phases. • Perform seeding and mulching or the installation of erosion control blankets where applicable. Final Stabilization • Inspect, maintain, and repair control measures installed during previous phases. Monitor revegetation and re- seed areas if needed. • Remove temporary control measures when areas are stabilized. 3.C.4 Materials Handling and Spill Prevention Materials and spills will be handled as described in Chevron’s SPCC plan for Skinner Ridge “Piceance Basin Field SPCC Plan”. Chevron has trained select employees to the Technician Level for Hazardous Waste Operations and Emergency Response. All other field employees are trained as First Responders at the Operations Level. This training prepares and enables employees to take proactive measures towards immediate corrective action in the event of a spill. Petroleum Product Management Pollutants from petroleum products used during construction activities adhere easily to soil particles and other surfaces. In the case of a spill or leak, soils contaminated with petroleum products will be contained, and remediated onsite or removed to a proper disposal site. Use of secondary containment will reduce the risk of spills or leaks contacting the ground, including during loading and unloading operations. The use of drip pans will reduce the likelihood Chevron U.S.A. Inc. 13 Entrada Consulting Group Skinner Ridge and South Canyon SWMP of spills or leaks contacting the ground during vehicle or equipment maintenance or fueling. Proposed soil erosion and sediment control practices will also aid in the retention of spills or leaks. 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. Routine daily inspections will be conducted to identify leaks from equipment and vehicles and if needed corrective actions will be implemented. The following guidelines for storing and managing petroleum products will be implemented: · All product containers will be clearly labeled · Drums (if present) will be kept within secondary containment and may need to be kept off the ground. Lids for drummed materials will be securely fastened. · Fuel tanks will be stored within secondary containment · Emergency spill response procedures will be available on site. Persons trained in handling spills will be on call at all times · Spill response equipment and materials (absorbent, shovels, etc.) will be easily accessible. Spills will be immediately cleaned up and contaminated materials will be properly stored on site until they can be disposed of in accordance with applicable regulations · Storage areas and containers will be regularly monitored for leaks and repaired or replaced as necessary. Contractors and subcontractors should be reminded about proper storage, handling and transferring of petroleum products or other hazardous materials during safety meetings. Other Material/Chemical Product Management Any other chemicals or materials stored on site that could contribute pollutants to runoff will be stored in original packaging and/or otherwise covered and may also need to be kept off the ground, to ensure that the material does not interact with stormwater. Storage or laydown areas will be maintained with good housekeeping, and regularly inspected for spills, leaks, and the potential of materials commingling with stormwater. Any minor spills or leaks will be cleaned up immediately. Spill Response Spills shall be reported to the SWMP administrator and/or other appropriate Chevron contacts. Chevron shall direct the appropriate personnel to handle the spill in accordance with the SPCC plan. Any spill not covered by this plan shall be controlled and contained as immediately as possible upon discovery, cleaned up as soon as practicable, and the spilled material and/or contaminated soil disposed of in accordance with all applicable regulations and with considerations for worker safety. A copy of the relevant sections of Chevron’s SPCC plan will be kept next to the SWMP and can be referenced from the Stormpro Max database. 3.C.5 Dedicated Asphalt or Concrete Batch Plants Dedicated asphalt or concrete batch plants are not anticipated within the project site. However, if the need for a batch plant arises, proper management techniques will be utilized. See SM-11 Temporary Batch Plant (TBP) in Appendix D Manual for batch plant management techniques. Chevron U.S.A. Inc. 14 Entrada Consulting Group Skinner Ridge and South Canyon SWMP 3.C.6 Vehicle Tracking In order to limit vehicle tracking of sediment, vehicles will use designated entry points into construction areas. Access roads and drive paths on pads will be sloped and maintained such that stormwater exits quickly, limiting the potential for excessive mud and rutting. Stabilization methods, such as road base and chemical stabilizers, along with Vehicle Tracking Control (VTC) and Stabilized Construction Roadway (SCR) (See SM-4 and SM-5 in the Control Measure Manual) will be used where practicable. The location of vehicle tracking controls will be shown on the site-specific map. 3.C.7 Waste Management and Disposal, Concrete Washout, and Contaminated Soils Waste Management and Disposal Exploration and production wastes will be managed in accordance with the COGCC 900 Series rules. Construction-related and other trash will be collected in covered containers and hauled off- site for disposal in suitable landfills. Portable toilets may be used to contain sanitary waste, with waste materials regularly pumped and transported off-site for disposal at approved facilities. If portable toilets are used, they will be staked or weighted to prevent tipping. Any slash from clearing activities will, if possible, be chipped and used on site for mulch, or utilized as a brush barrier at the site perimeter. Concrete Washout Concrete washout is not anticipated within the project site. However, if the need for concrete washout arises, an appropriate containment structure will be utilized. See MM-1 Concrete Washout Area (CWA) in Appendix D for control measure descriptions and construction details of concrete washout containments. The locations of any waste containments or concrete washout area on site are shown on the site maps available in the StormPro Max database. 3.C.8 Ground Water and Stormwater Dewatering Groundwater Dewatering No groundwater dewatering is anticipated at this time. If groundwater is encountered, the dewatering of the site will be done in accordance with Part I.D.3.d of the permit. Control measures to be utilized to prevent the groundwater from leaving the site as surface runoff will be shown on the site map for the disturbance. Stormwater Dewatering If the need for stormwater dewatering is encountered, Control measures will be utilized to prevent erosion and trap sediment. See SM-9 Dewatering Operations (DW) in Appendix D for control measure descriptions for dewatering operations. The Control measures to be utilized will be shown on the site map for the disturbance. 4. FINAL STABILIZATION AND LONG-TERM STORMWATER MANAGEMENT A site is considered finally stabilized when all ground surface disturbing activities at the site have been completed and all disturbed areas have been either built on, compacted, covered, paved, or otherwise stabilized in such a way as to minimize erosion to the extent practicable, or a uniform vegetative cover has been established that reflects a total percent plant cover of at least seventy percent (70%) of pre-disturbance levels or reference areas. Chevron U.S.A. Inc. 15 Entrada Consulting Group Skinner Ridge and South Canyon SWMP Typical seed mix and application rates for Skinner Ridge and South Canyon are presented below in Table 3. Table 3 – Approved Seed Mixtures *Elevations up to 7,000ft* Native Mixture/Variety: Species Variety %in mix Rate (PLS∗lb/acre) Drilled Broadcast Streambank Wheatgrass 25 2.8 5.6 Galleta Grass (floret) Viva 25 2.8 5.6 Alkali Sacation Sandy Dropseed 25 0.4 0.8 (If sandy) Indian Ricegrass Paloma 25 3.0 6.0 Native and Introduced Mixture/Variety: Species Variety %in mix Rate (PLS∗lb/acre) Drilled Broadcast Crested Wheatgrass Ephriam 25 1.5 3.0 Galleta Grass (floret) Viva 10 1.1 2.2 Alkali Sacation Sandy Dropseed 15 0.2 0.4 (If sandy) Indian Ricegrass Paloma 25 3.0 6.0 Russian Wildrye Bozoisky 25 2.5 5.0 *Elevations 7,000ft to 9,000ft* Native Mixture/Variety: Species Variety %in mix Rate (PLS∗lb/acre) Drilled Broadcast Thickspike Wheatgrass Critana 25 2.5 5.0 Western WheatGrass Arriba 25 4.0 8.0 Green Needlegrass 25 2.5 5.0 Prairie Junegrass 15 0.2 0.4 Chevron U.S.A. Inc. 16 Entrada Consulting Group Skinner Ridge and South Canyon SWMP Rocky Mtn. Penstemon Bandera 10 0.6 1.2 Fourwing Saltbrush add on 1.0 2.0 Native and Introduced Mixture/Variety: Species Variety %in mix Rate (PLS∗lb/acre) Drilled Broadcast Pubescent Wheatgrass Luna 25 3.5 7.0 Western Whatgrass Arriba 25 4.0 8.0 Russian Wildrye Bozoisky 25 2.5 5.0 Alfalfa Ladak 15 1.2 2.4 Small Burnet Delar 10 3.0 0.0 Fourwing Saltbrush add on 1.0 2.0 ∗PLS = Pure Live Seed Specific control measures for soil preparation and amendment, soil stabilization, and sediment control during final stabilization will be chosen on a site by site basis, based on soil condition and slope. The control measures chosen will be shown on the site specific maps. The general practices for achieving revegetation are described in EC-2 Temporary and Permanent Seeding in Appendix D. Sites are considered finally stabilized once site preparation and interim reclamation (COGCC Rule 1003) are complete and the above stabilization criteria have been met, even though the site will be disturbed again in the future for final reclamation. 5. INSPECTIONS AND MAINTENANCE PROCEDURES Site inspections will be conducted with the requirements and minimum schedule as outlined in Part I.D.2 of the CDPS general permit (COR-040000). The requirements are as follows: · At least one inspection every 7 calendar days. Or · At least one inspection every 14 calendar days if post-storm event inspections are conducted within 24 hours after the end of any precipitation or snowmelt event that causes surface erosion. Post-storm inspections may be used to fulfill the 14-day routine inspection requirement. · If a site is considered temporarily idle, that is, no construction activities will occur following a storm event, then a post-storm inspection will be conducted prior to re-commencing constructing activities, but no later than 72 hours following the storm event. Routine inspections must still be conducted at least every 14 calendar days. · When the site, or portions of a site, are awaiting establishment of vegetative ground cover and final stabilization, a thorough inspection must be completed every 30 days. Post- storm event inspections are not required under this schedule. This reduced inspections Chevron U.S.A. Inc. 17 Entrada Consulting Group Skinner Ridge and South Canyon SWMP schedule is allowed if all construction activities resulting in ground disturbance are complete, all activities required for final stabilization, as outlined in Section 4, with the exception of seed that has not been applied due to seasonal conditions or the necessity for additional seed application to augment previous efforts. The SWMP must be amended to show the areas included in this reduced schedule. · Inspections are not required at sites where snow cover exists over the entire site for an extended period as long as melting conditions do not exist. This exception applies to routine 7-day, 14-day and monthly inspections, as well as the post-storm event inspections. The following information must be documented in the inspection record for the use of this exclusion: dates when snow cover occurred, date when construction activities ceased, and date melting conditions began. A trained and qualified person familiar with the SWMP and stormwater controls will conduct all inspections. The scope of the inspection will cover 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. These areas will be inspected for evidence of, or the potential for, pollutants leaving the construction site boundaries entering the stormwater drainage system or discharging to waters of the state. All erosion and sediment control practices identified in this SWMP will also be evaluated to ensure that they are maintained and operating correctly. Personnel performing site inspections will record the information as outlined below on the inspection report. This inspection report will identify any incidents of non-compliance with the terms and conditions of the general permit. The inspection report will include: i. the inspection date ii. name(s) and title(s) of personnel making the inspection iii. weather conditions at the time of the inspection iv. phase of construction at the time of inspection v. estimated acreage of disturbance at the time of inspection vi. location(s) of discharges of sediment or other pollutants from the site vii. location(s) of control measures that need to be maintained viii. location(s) and identifications of inadequate control measures ix. location(s) where additional control measures are needed that were not in place at the time of inspection x. description of the minimum inspection frequency utilized when conducting each inspection xi. 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 xii. after adequate corrective action(s) have been taken, or where a report does not identify any incidents requiring corrective action(s), 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. If deficiencies or maintenance issues are noted on the inspection form, or additional control measures are needed, the Stormwater Administrator for Chevron will be contacted and they will direct a contractor to perform the proper actions. Chevron U.S.A. Inc. 18 Entrada Consulting Group Skinner Ridge and South Canyon SWMP Control measures that have failed or have the potential to fail without maintenance or modification, will be addressed as soon as possible, immediately in many cases, to prevent the discharge of pollutants. All control measures will be adequately maintained in accordance with good engineering, hydrologic and pollution control practices, including removal of collected sediment outside the acceptable tolerances of the control measures. Chevron utilizes the StormPro Max online database for maintaining inspection reports. Inspection records dating back to August 2013 are stored within this database. Older reports are stored in the inspection binder at Chevron’s Grand Junction office. The inspection records for each disturbance will be kept for a minimum of three years after termination of permit coverage. Figures Appendix A Permit to Discharge COR-400907 CDPS Certification COR-037787 General Permit COR-040000 Related Documents CHANGE OF CONTACT(s) for all PERMITS, CERTIFICATIONS, AND AUTHORIZATIONS MAIL TO: CDPHE WQCD Mail Code WQC-PCP-2034 4300 Cherry Creek Dr South Denver CO 80246 This form must be submitted for changes made to any of the contacts or information listed below. PHOTO COPIES, FAXED COPIES, PDF COPIES OR EMAILS WILL NOT BE ACCEPTED. PERMIT, CERTIFICATION, OR AUTHORIZATION NUMBER __________ (This number does not end in 0000) (A separate form must be prepared for each Permit, Certification, or Authorization covered by these changes.) PERMITTEE ORGANIZATION FORMAL NAME (If more than one please add additional pages) : The legally responsible organization is either the owner or operator of the facility or project to which the permit has been issued, or both if designated as co-permittees by the Division. FACILITY NAME ENTER ALL OF THE INFORMATION FOR EACH CONTACT WHERE THERE IS A CHANGE. 1. PERMITTEE the person authorized to sign and certify the permit application. This person receives all permit correspondences and is legally responsible for compliance with the permit. This form must be signed by the Permittee to be considered complete. Per Regulation 61 In all cases, it shall be signed as follows: a)In the case of corporations, by a responsible corporate officer. For the purposes of this section, the responsible corporate officer is responsible for the overall operation of the facility from which the discharge described in the application originates. b)In the case of a partnership, by a general partner. c)In the case of a sole proprietorship, by the proprietor. d)In the case of a municipal, state, or other public facility, by either a principal executive officer or ranking elected official Revised 4/1/2015 For Agency Use Only Date Received _____/_____/_____ Effective Date _____/_____/_____ 4300 Cherry Creek Drive S., Denver, CO 80246-1530 P 303-692-2000 www.colorado.gov/cdphe Responsible Position (title) Held by (person) Telephone # email address Organization Mailing address City State Zip CHANGE OF CONTACT(S) FOR ALL PERMITS, CERTIFICATIONS AND AUTHORIZATIONS 2. DMR COGNIZANT OFFICIAL (i.e. authorized agent) the person authorized to sign and certify the Reports as required by the permit, including Discharge Monitoring Reports (DMR’s), Annual Reports, Compli- ance Schedule submittals, and other information requested by the Division. The Division will transmit pre- printed reports (i.e. DMR’s) to this person. If more than one person, please add additional pages. This party may not sign application forms. 3. SITE CONTACT local contact for questions relating to the facility and discharge authorized by this permit for the facility 4. CERTIFIED OPERATOR IN RESPONSIBLE CHARGE (ORC) may designate on or both if needed A. Wastewater Treatment Facility ORC B. Wasterwater Collection System ORC Responsible Position (title) Held by (person) Telephone # email address Organization Mailing address City State Zip Responsible Position (title) Held by (person) Telephone # email address Organization Mailing address City State Zip Operator ID Number Legal Name Telephone # email address Organization Mailing address City State Zip Operator ID Number Legal Name Telephone # email address Organization Mailing address City State Zip CHANGE OF CONTACT(S) FOR ALL PERMITS, CERTIFICATIONS AND AUTHORIZATIONS 5. BILLING CONTACT if different than permittee 6. OTHER CONTACT TYPES (check below) Add pages if necessary. REQUIRED CERTIFICATION SIGNATURE [Reg 61.4(1)(h)] "I certify under penalty of law that this document and all attachments were prepared under my direction or supervi- sion in accordance with a system designed to assure that qualified personnel properly gather and evaluate the infor- mation 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 (Legally Responsible Party) _________________________________________Date ________________ Name (printed) _____________________________________________Title______________________________ Responsible Position (title) Held by (person) Telephone # email address Organization Mailing address City State Zip Responsible Position (title) Held by (person) Telephone # email address Organization Mailing address City State Zip Pretreatment Coordinator Compliance Contact Environmental Contact Stormwater MS4 Responsible Party Biosolids Responsible Party Stormwater Authorized Representative Inspection Facility Contact Property Owner Consultant Other COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT Water Quality Control Division CDPS GENERAL PERMIT STORMWATER DISCHARGES ASSOCIATED WITH CONSTRUCTION ACTIVITY AUTHORIZATION TO DISCHARGE UNDER THE COLORADO DISCHARGE PERMIT SYSTEM (CDPS) 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.A.1. 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 the certification to discharge 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 becomes effective on April 1, 2019, and shall expire at midnight March 31, 2024. Issued and signed this 1st day of November 2018. COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT Ellen Howard Kutzer, Permits Section Manager Water Quality Control Division Permit History Originally signed and issued October 31, 2018; effective April 1, 2019. Table of Contents Part I ........................................................................................................................... 1 COVERAGE UNDER THIS PERMIT...................................................................................... 1 Authorized Discharges ............................................................................................ 1 Limitations on Coverage .......................................................................................... 1 Permit Certification and Submittal Procedures ............................................................... 2 EFFLUENT LIMITATIONS ............................................................................................... 6 Requirements for Control Measures Used to Meet Effluent Limitations ................................... 6 Discharges to an Impaired Waterbody .......................................................................... 9 General Requirements ........................................................................................... 10 STORMWATER MANAGEMENT PLAN (SWMP) REQUIREMENTS .................................................... 11 SWMP General Requirements ................................................................................... 11 SWMP Content .................................................................................................... 11 SWMP Review and Revisions .................................................................................... 13 SWMP Availability ................................................................................................. 14 SITE INSPECTIONS ..................................................................................................... 14 Person Responsible for Conducting Inspections .............................................................. 14 Inspection Frequency ............................................................................................ 14 Inspection Frequency for Discharges to Outstanding Waters ............................................... 15 Reduced Inspection Frequency ................................................................................. 15 Inspection Scope .................................................................................................. 16 DEFINITIONS ........................................................................................................... 17 MONITORING ........................................................................................................... 20 Oil and Gas Construction ............................................................................................ 21 Part II: Standard Permit Conditions ...................................................................................... 22 DUTY TO COMPLY ..................................................................................................... 22 DUTY TO REAPPLY .................................................................................................... 22 NEED TO HALT OR REDUCE ACTIVITY NOT A DEFENSE ........................................................... 22 DUTY TO MITIGATE ................................................................................................... 22 PROPER OPERATION AND MAINTENANCE .......................................................................... 22 PERMIT ACTIONS ...................................................................................................... 22 PROPERTY RIGHTS .................................................................................................... 22 DUTY TO PROVIDE INFORMATION ................................................................................... 23 INSPECTION AND ENTRY ............................................................................................. 23 MONITORING AND RECORDS ......................................................................................... 23 SIGNATORY REQUIREMENTS ......................................................................................... 24 PART I Permit No.: COR400000 Authorization to Sign: ............................................................................................ 24 Electronic Signatures ............................................................................................ 25 Change in Authorization to Sign ................................................................................ 25 REPORTING REQUIREMENTS ......................................................................................... 25 Planned Changes .................................................................................................. 25 Anticipated Non-Compliance ................................................................................... 25 Transfer of Ownership or Control .............................................................................. 25 Monitoring reports ................................................................................................ 26 Compliance Schedules ........................................................................................... 26 Twenty-four hour reporting ..................................................................................... 26 Other non-compliance ........................................................................................... 27 Other information ................................................................................................ 27 BYPASS ................................................................................................................. 27 Bypass not exceeding limitations .............................................................................. 27 Notice of bypass .................................................................................................. 27 Prohibition of Bypass ............................................................................................. 27 UPSET................................................................................................................... 28 Effect of an upset ................................................................................................ 28 Conditions necessary for demonstration of an Upset ....................................................... 28 Burden of Proof ................................................................................................... 28 RETENTION OF RECORDS ............................................................................................. 28 Post-Expiration or Termination Retention .................................................................... 28 On-site Retention ................................................................................................. 29 REOPENER CLAUSE .................................................................................................... 29 Procedures for modification or revocation ................................................................... 29 Water quality protection ........................................................................................ 29 SEVERABILITY .......................................................................................................... 29 NOTIFICATION REQUIREMENTS ...................................................................................... 29 Notification to Parties ........................................................................................... 29 RESPONSIBILITIES ..................................................................................................... 30 Reduction, Loss, or Failure of Treatment Facility ........................................................... 30 Oil and Hazardous Substance Liability ............................................................................. 30 Emergency Powers .................................................................................................... 30 Confidentiality ........................................................................................................ 30 Fees ..................................................................................................................... 30 PART I Permit No.: COR400000 Duration of Permit .................................................................................................... 30 Section 307 Toxics .................................................................................................... 30 PART I Permit No.: COR400000 Page 1 of 33 Part I Note: At the first mention of terminology that has a specific connotation for the purposes of this permit, the terminology is electronically linked to the definitions section of the permit in Part I.E. COVERAGE UNDER THIS PERMIT Authorized Discharges This general permit authorizes permittee(s) to discharge the following to state waters: stormwater associated with construction activity and specified non-stormwater associated with construction activity. The following types of stormwater and non-stormwater discharges are authorized under this permit: Allowable Stormwater Discharges i. Stormwater discharges associated with construction activity. ii. Stormwater discharges associated with producing earthen materials, such as soils, sand, and gravel dedicated to providing material to a single contiguous site, or within ¼ mile of a construction site (i.e. borrow or fill areas) iii. Stormwater discharges associated with dedicated asphalt, concrete batch plants and masonry mixing stations (Coverage under this permit is not required if alternative coverage has been obtained.) Allowable Non-Stormwater Discharges The following non-stormwater discharges are allowable under this permit if the discharges are identified in the stormwater management plan in accordance with Part I.C. and if they have appropriate control measures in accordance with Part I.B.1. i. Discharges from uncontaminated springs that do not originate from an area of land disturbance. ii. Discharges to the ground of concrete washout water associated with the washing of concrete tools and concrete mixer chutes. Discharges of concrete washout water must not leave the site as surface runoff or reach receiving waters as defined by this permit. iii. Discharges of landscape irrigation return flow. Emergency Fire Fighting Discharges resulting from emergency firefighting activities are authorized by this permit. Limitations on Coverage Discharges not authorized by this permit include, but are not limited to, the discharges and activities listed below. Permittees may seek individual or alternate general permit coverage for the discharges, as appropriate and available. Discharges of Non-Stormwater PART I Permit No.: COR400000 Page 2 of 33 Discharges of non-stormwater, except the authorized non-stormwater discharges listed in Part I.A.1.b., are not eligible for coverage under this permit. Discharges Currently Covered by another Individual or General Permit Discharges Currently Covered by a Water Quality Control Division (division) Low Risk Guidance Document Permit Certification and Submittal Procedures Duty to apply The following activities shall apply for coverage under this permit: i. Construction sites that will disturb one acre or more; or ii. Construction sites that are part of a common plan of development or sale; or iii. Stormwater discharges that are designated by the division as needing a stormwater permit because the discharge: (a) Contributes to a violation of a water quality standard; or (b) is a significant contributor of pollutants to state waters. Application Requirements To obtain authorization to discharge under this permit, applicants applying for coverage following the effective date of the renewal permit shall meet the following requirements: i. Owners and operators submitting an application for permit coverage will be co- permittees subject to the same benefits, duties, and obligations under this permit. ii. Signature requirements: Both the owner and operator (permittee) of the construction site, as defined in Part I.E., must agree to the terms and conditions of the permit and submit a completed application that includes the signature of both the owner and the operator. In cases where the duties of the owner and operator are managed by the owner, both application signatures may be completed by the owner. Both the owner and operator are responsible for ensuring compliance with all terms and conditions of the permit, including implementation of the stormwater management plan. iii. Applicants must use the paper form provided by the division or the electronic form provided on the division’s web-based application platform when applying for coverage under this permit. iv. The applicant(s) must develop a stormwater management plan (SWMP) in accordance with the requirements of Part I.C. The applicant(s) must also certify that the SWMP is complete, or will be complete, prior to commencement of any construction activity. PART I Permit No.: COR400000 Page 3 of 33 v. The applicant(s) must submit a complete, accurate, and signed permit application electronically, by mail or hand delivery to the division at least 10 days prior to the commencement of construction activity except that construction activities that are in response to a public emergency related site shall apply for coverage no later than 14 days after the commencement of construction activities. The provisions of this part in no way remove a violation of the Colorado Water Quality Control Act if a point source discharge occurs prior to the issuance of a CDPS permit. vi. The application must be signed in accordance with the requirements of Part IA. Applications submitted by mail or hand delivered should be directed to: Colorado Department of Public Health and Environment Water Quality Control Division Permits Section, WQCD-PS-B2 4300 Cherry Creek Drive South Denver, CO 80246 vii. The applicant(s) must receive written notification that the division granted permit coverage prior to conducting construction activities except for construction activities that are in response to a public emergency related site Division Review of Permit Application Within 10 days of receipt of the application, and following review of the application, the division may: i. Issue a certification of coverage; ii. request additional information necessary to evaluate the discharge; iii. delay the authorization to discharge pending further review; iv. notify the applicant that additional terms and conditions are necessary; or v. deny the authorization to discharge under this general permit. Alternative Permit Coverage i. Division Required Alternate Permit Coverage: The Division may require an applicant or permittee to apply for an individual permit or an alternative general permit if it determines the discharge does not fall under the scope of this general permit. In this case, the Division will notify the applicant or permittee that an individual permit application is required. ii. Permittee Request for alternate permit coverage: A permittee authorized to discharge stormwater under this permit may request to be excluded from coverage under this general permit by applying for an individual permit. In this case, the permittee must submit an individual application, with reasons supporting the request, to the Division at least 180 days prior to any discharge. When an individual permit is issued, the permittee’s authorization to discharge under this permit is terminated on the effective date of the individual permit. Submittal Signature Requirements PART I Permit No.: COR400000 Page 4 of 33 Documents required for submittal to the division in accordance with this permit, including applications for permit coverage and other documents as requested by the division, must include signatures by both the owner and the operator, except for instances where the duties of the owner and operator are managed by the owner. Signatures on all documents submitted to the division as required by this permit must meet the Standard Signatory Requirements in Part II.K. of this permit in accordance with 40 C.F.R. 122.41(k). i. Signature Certification Any person(s) signing documents required for submittal to the Division must 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.” Compliance Document Signature Requirements Documents which are required for compliance with the permit, but for which submittal to the division is not required unless specifically requested by the division, must be signed by the individual(s) designated as the Qualified Stormwater Manager, as defined in Part I.E. i. Any person(s) signing inspection documents required for compliance with the permit must make the following statement: “I verify that, to the best of my knowledge and belief, all corrective action and maintenance items identified during the inspection are complete, and the site is currently in compliance with the permit.” Field Wide Permit Coverage for Oil and Gas Construction At the discretion of the division, a single permit certification may be issued to a single oil and gas permittee to cover construction activity related discharges from an oil and gas field at multiple locations that are not necessarily contiguous. Permit Coverage without Application Qualifying Local Program: When a small construction site is within the jurisdiction of a qualifying local program, the owner and operator of the construction activity are authorized to discharge stormwater associated with small construction activity under this general permit without the submittal of an application to the division. Sites covered by a qualifying local program are exempt from the following sections of this general permit: PART I Permit No.: COR400000 Page 5 of 33 Part I.A.3.a.; Part I.A.3.b.; Part I.A.3.c.; Part I.A.3.d.; Part I.A.3.g.; Part I.A.3.i.; Part I.A.3.j.; Part I.A.3.k. Sites covered by a qualifying local program are subject to the following requirements: i. 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. ii. Permit Coverage Termination: When a site under a Qualifying Local Program is finally stabilized, coverage under this permit is automatically terminated. iii. Compliance with Qualifying Local Program: Qualifying Local Program requirements that are equivalent to the requirements of this permit are incorporated by reference. Permittees authorized to discharge under this permit, must comply with the equivalent requirements of the Qualifying Local Program that has jurisdiction over the site as a condition of this permit. iv. Compliance with Remaining Permit Conditions. Requirements of this permit that are in addition to or more stringent than the requirements of the Qualifying Local Program apply in addition to the requirements of the Qualifying Local Program. v. Written Authorization of Coverage: The division or local municipality may require any permittee within the jurisdiction of a Qualifying Local Program covered under this permit to apply for, and obtain written authorization of coverage under this permit. The permittee must be notified in writing that an application for written authorization of coverage is required. Permittee Initiated Permit Actions Permittee initiated permit actions, including but not limited to modifications, contact changes, transfers, reassignments, and terminations, shall be conducted following division guidance and using appropriate division-provided forms. Sale of Residence to Homeowner Residential construction sites only: The permittee may remove residential lots from permit coverage once the lot meets the following criteria: i. the residential lot has been sold to the homeowner(s) for private residential use; ii. a certificate of occupancy, or equivalent, is maintained on-site and is available during division inspections; iii. the lot is less than one acre of disturbance; iv. all construction activity conducted on the lot by the permittee is complete; v. the permittee is not responsible for final stabilization of the lot; and vi. the SWMP was modified to indicate the lot is no longer part of the construction activity. If the residential lot meets the criteria listed above then activities occurring on the lot are no longer considered to be construction activities with a duty to apply and maintain permit coverage. Therefore, the permittee is not required to meet the final stabilization requirements and may terminate permit coverage for the lot. PART I Permit No.: COR400000 Page 6 of 33 Permit Expiration and Continuation of Permit Coverage Authorization to discharge under this general permit shall expire at midnight on March 31, 2024. While Regulation 61.4 requires a permittee to submit an application for continuing permit coverage 180 days before the permit expires, the division is requiring that permittees desiring continued coverage under this general permit must reapply at least 90 days in advance of this permit expiration. The Division will determine if the permittee may continue to discharge stormwater 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. If this permit is not reissued or replaced prior to the expiration date, it will be administratively continued and remain in force and effect. For permittees that have applied for continued permit coverage, discharges authorized under this permit prior to the expiration date will automatically remain covered by this permit until the earliest of: i. An authorization to discharge under a reissued permit, or a replacement of this permit, following the timely and appropriate submittal of a complete application requesting authorization to discharge under the new permit and compliance with the requirements of the new permit; or ii. The issuance and effect of a termination issued by the Division; or iii. The issuance or denial of an individual permit for the facility’s discharges; or iv. A formal permit decision by the Division not to reissue this general permit, at which time the Division will identify a reasonable time period for covered dischargers to seek coverage under an alternative general permit or an individual permit. Coverage under this permit will cease when coverage under another permit is granted/authorized; or v. The Division has informed the permittee that discharges previously authorized under this permit are no longer covered under this permit. EFFLUENT LIMITATIONS Requirements for Control Measures Used to Meet Effluent Limitations The permittee must implement control measures to minimize the discharge of pollutants from all potential pollutant sources at the site. Control measures must be installed prior to commencement of activities that may contribute pollutants to stormwater discharges. Control measures must be selected, designed, installed and maintained in accordance with good engineering, hydrologic and pollution control practices. Control measures implemented at the site must be designed to prevent pollution or degradation of state waters. Stormwater Pollution Prevention The permittee must implement structural and/or nonstructural control measures that effectively minimize erosion, sediment transport, and the release of other pollutants related to construction activity. i. Control Measures for Erosion and Sediment Control PART I Permit No.: COR400000 Page 7 of 33 Control measures for erosion and sediment control may include, but are not limited to, wattles/sediment control logs, silt fences, earthen dikes, drainage swales, sediment traps, subsurface drains, pipe slope drains, inlet protection, outlet protection, gabions, sediment basins, temporary vegetation, permanent vegetation, mulching, geotextiles, sod stabilization, slope roughening, maintaining existing vegetation, protection of trees, and preservation of mature vegetation. Specific non-structural control measures must meet the requirements listed below. Specific control measures must meet the requirements listed below. (a) Vehicle tracking controls shall either be implemented to minimize vehicle tracking of sediment from disturbed areas, or the areas where vehicle tracking occurs shall meet subsection Part I.B.1.a.i(b); (b) Stormwater runoff from all disturbed areas and soil storage areas for which permanent or temporary stabilization is not implemented, must flow to at least one control measure to minimize sediment in the discharge. This may be accomplished through filtering, settling, or straining. The control measure must be selected, designed, installed and adequately sized in accordance with good engineering, hydrologic and pollution control practices. The control measure(s) must contain or filter flows in order to prevent the bypass of flows without treatment and must be appropriate for stormwater runoff from disturbed areas and for the expected flow rate, duration, and flow conditions (i.e., sheet or concentrated flow); (c) Outlets that withdraw water from or near the surface shall be installed when discharging from basins and impoundments, unless infeasible. (d) Maintain pre-existing vegetation or equivalent control measures for areas within 50 horizontal feet of receiving waters as defined by this permit, unless infeasible. (e) Soil compaction must be minimized for areas where infiltration control measures will occur or where final stabilization will be achieved through vegetative cover. (f) Unless infeasible, topsoil shall be preserved for those areas of a site that will utilize vegetative final stabilization. (g) Minimize the amount of soil exposed during construction activity, including the disturbance of steep slopes. ii. Practices for Other Common Pollutants (a) Bulk storage, 55 gallons or greater, for petroleum products and other liquid chemicals must have secondary containment, or equivalent protection, in order to contain spills and to prevent spilled material from entering state waters. (b) Control measures designed for concrete washout waste must be implemented. This includes washout waste discharged to the ground as authorized under this permit and washout waste from concrete trucks and masonry operations contained on site. The permittee must ensure the washing activities do not contribute pollutants to stormwater runoff, or receiving waters in accordance Part I.A.1.b.ii. Discharges that may reach groundwater must flow through soil PART I Permit No.: COR400000 Page 8 of 33 that has buffering capacity prior to reaching groundwater, as necessary to meet the effluent limits in this permit, including Part I.B.3.a. The concrete washout location shall be not be located in an area where shallow groundwater may be present and would result in buffering capacity not being adequate, such as near natural drainages, springs, or wetlands. This permit authorizes discharges to the ground of concrete washout waste. iii. Stabilization Requirements The following requirements must be implemented for each site. (a) Temporary stabilization must be implemented for earth disturbing activities on any portion of the site where ground disturbing construction activity has permanently ceased, or temporarily ceased for more than 14 calendar days. Temporary stabilization methods may include, but are not limited to, tarps, soil tackifier, and hydroseed. The permittee may exceed the 14-day schedule when either the function of the specific area of the site requires it to remain disturbed, or, physical characteristics of the terrain and climate prevent stabilization. The SWMP must document the constraints necessitating the alternative schedule, provide the alternate stabilization schedule, and identify all locations where the alternative schedule is applicable on the site map. (b) Final stabilization must be implemented for all construction sites. Final stabilization is reached when all ground surface disturbing activities at the construction site are complete; and, for all areas of ground surface disturbing activities, either a uniform vegetative cover with an individual plant density of at least 70 percent of pre-disturbance levels is established, or equivalent permanent alternative stabilization methods are implemented. The division may approve alternative final stabilization criteria for specific operations. (c) Final stabilization must be designed and installed as a permanent feature. Final stabilization measures for obtaining a vegetative cover or alternative stabilization methods include, but are not limited to, the following as appropriate: (1) Seed mix selection and application methods; (2) Soil preparation and amendments; (3) Soil stabilization methods (e.g., crimped straw, hydro mulch or rolled erosion control products); (4) Appropriate sediment control measures as needed until final stabilization is achieved; (5) Permanent pavement, hardscape, xeriscape, stabilized driving surfaces; (6) Other alternative stabilization practices as applicable; PART I Permit No.: COR400000 Page 9 of 33 (d) The permittee(s) must ensure all temporary control measures are removed from the construction site once final stabilization is achieved, except when the control measure specifications allow the control measure to be left in place (i.e., bio-degradable control measures). Maintenance The permittee must ensure that all control measures remain in effective operating condition and are protected from activities that would reduce their effectiveness. Control measures must be maintained in accordance with good engineering, hydrologic and pollution control practices. Observations leading to the required maintenance of control measures can be made during a site inspection, or during general observations of site conditions. The necessary repairs or modifications to a control measure requiring routine maintenance, as defined in Part I.E., must be conducted to maintain an effective operating condition. This section is not subject to the requirements in Part I.B.1.c. below. Corrective Actions The permittee must assess the adequacy of control measures at the site, and the need for changes to those control measures, to ensure continued effective performance. When an inadequate control measure, as defined in Part I.E., is identified (i.e., new or replacement control measures become necessary), the following corrective action requirements apply. The permittee is in noncompliance with the permit until the inadequate control measure is replaced or corrected and returned to effective operating condition in compliance with Part I.B.1. and the general requirements in Part I.B.3. If the inadequate control measure results in noncompliance that meets the conditions of Part II.L., the permittee must also meet the requirements of that section. i. The permittee must take all necessary steps to minimize or prevent the discharge of pollutants, until a control measure is implemented and made operational and/or an inadequate control measure is replaced or corrected and returned to effective operating condition. If it is infeasible to install or repair of control measure immediately after discovering the deficiency, the following must be documented and kept on record in accordance with the recordkeeping requirements in Part II. (a) Describe why it is infeasible to initiate the installation or repair immediately; and (b) Provide a schedule for installing or repairing the control measure and returning it to an effective operating condition as soon as possible. ii. If applicable, the permittee must remove and properly dispose of any unauthorized release or discharge (e.g., discharge of non-stormwater, spill, or leak not authorized by this permit.) The permittee must also clean up any contaminated surfaces to minimize discharges of the material in subsequent storm events. Discharges to an Impaired Waterbody Total Maximum Daily Load (TMDL) If the permittee’s discharge flows to or could reasonably be expected to flow to any water body for which a TMDL has been approved, and stormwater discharges PART I Permit No.: COR400000 Page 10 of 33 associated with construction activity were assigned a pollutant-specific Wasteload Allocation (WLA) under the TMDL, the division may: i. ensure the WLA is implemented properly through alternative local requirements, such as by a municipal stormwater permit; or ii. notify the permittee of the WLA and amend the permittee’s certification to add specific effluent limits and other requirements, as appropriate. The permittee may be required to do the following: (a) under the permittee’s SWMP, implement specific control measures based on requirements of the WLA, and evaluate whether the requirements are met through implementation of existing stormwater control measures or if additional control measures are necessary. Document the calculations or other evidence demonstrating that the requirements are expected to be met; and (b) if the evaluation shows that additional or modified control measures are necessary, describe the type and schedule for the control measure additions or modifications. iii. 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. General Requirements Discharges authorized by this permit shall not cause, have the reasonable potential to cause, or measurably contribute to an exceedance of any applicable water quality standard, including narrative standards for water quality. The division may require sampling and testing, on a case-by-case basis, in the event that there is reason to suspect that the SWMP is not adequately minimizing pollutants in stormwater or in order to measure the effectiveness of the control measures in removing pollutants in the effluent. Such monitoring may include Whole Effluent Toxicity testing. The permittee must comply with the lawful requirements of federal agencies, municipalities, counties, drainage districts and other local agencies including applicable requirements in Municipal Stormwater Management Programs developed to comply with CDPS permits. The permittee must comply with local stormwater management requirements, policies and guidelines including those for erosion and sediment control. All construction site wastes must be properly managed to prevent potential pollution of state waters. This permit does not authorize on-site waste disposal. This permit does not relieve the permittee of the reporting requirements in 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.L. of the permit). PART I Permit No.: COR400000 Page 11 of 33 STORMWATER MANAGEMENT PLAN (SWMP) REQUIREMENTS SWMP General Requirements A SWMP shall be developed for each construction site covered by this permit. The SWMP must be prepared in accordance with good engineering, hydrologic and pollution control practices. i. For public emergency related sites a SWMP shall be created no later than 14 days after the commencement of construction activities. The permittee must implement the provisions of the SWMP as written and updated, from commencement of construction activity until final stabilization is complete. The division may review the SWMP. A copy of the SWMP must be retained onsite or be onsite when construction activities are occurring at the site unless the permittee specifies another location and obtains approval from the division. SWMP Content The SWMP, at a minimum, must include the following elements. i. Qualified Stormwater Manager. The SWMP must list individual(s) by title and name who are designated as the site’s qualified stormwater manager(s) responsible for implementing the SWMP in its entirety. This role may be filled by more than one individual. ii. Spill Prevention and Response Plan. The SWMP must have a spill prevention and response plan. The plan may incorporate by reference any part of a Spill Prevention Control and Countermeasure (SPCC) plan under section 311 of the Clean Water Act (CWA) or a Spill Prevention Plan required by a separate CDPS permit. The relevant sections of any referenced plans must be available as part of the SWMP consistent with Part I.C.4. iii. Materials Handling. The SWMP must describe and locate all control measures implemented at the site to minimize impacts from handling significant materials that could contribute pollutants to runoff. These handling procedures can include control measures for pollutants and activities such as, exposed storage of building materials, paints and solvents, landscape materials, fertilizers or chemicals, sanitary waste material, trash and equipment maintenance or fueling procedures. iv. Potential Sources of Pollution. The SWMP must list all potential sources of pollution which may reasonably be expected to affect the quality of stormwater discharges associated with construction activity from the site. This shall include, but is not limited to, the following pollutant sources: (a) disturbed and stored soils; (b) vehicle tracking of sediments; (c) management of contaminated soils; (d) loading and unloading operations; PART I Permit No.: COR400000 Page 12 of 33 (e) outdoor storage activities (erodible building materials, fertilizers, chemicals, etc.); (f) vehicle and equipment maintenance and fueling; (g) significant dust or particulate generating processes (e.g., saw cutting material, including dust); (h) routine maintenance activities involving fertilizers, pesticides, herbicides, detergents, fuels, solvents, oils, etc.; (i) on-site waste management practices (waste piles, liquid wastes, dumpsters); (j) concrete truck/equipment washing, including washing of the concrete truck chute and associated fixtures and equipment; (k) dedicated asphalt, concrete batch plants and masonry mixing stations; (l) non-industrial waste sources such as worker trash and portable toilets. v. Implementation of Control Measures. The SWMP must include design specifications that contain information on the implementation of the control measure in accordance with good engineering hydrologic and pollution control practices; including as applicable drawings, dimensions, installation information, materials, implementation processes, control measure-specific inspection expectations, and maintenance requirements. The SWMP must include a documented use agreement between the permittee and the owner or operator of any control measures located outside of the permitted area, that are utilized by the permittee’s construction site for compliance with this permit, but not under the direct control of the permittee. The permittee is responsible for ensuring that all control measures located outside of their permitted area, that are being utilized by the permittee’s construction site, are properly maintained and in compliance with all terms and conditions of the permit. The SWMP must include all information required of and relevant to any such control measures located outside the permitted area, including location, installation specifications, design specifications and maintenance requirements. vi. Site Description. The SWMP must include a site description which includes, at a minimum, the following: (a) the nature of the construction activity at the site; (b) the proposed schedule for the sequence for major construction activities and the planned implementation of control measures for each phase. (e.g.: clearing, grading, utilities, vertical, etc.); (c) estimates of the total acreage of the site, and the acreage expected to be disturbed by clearing, excavation, grading, or any other construction activities; (d) a summary of any existing data used in the development of the construction site plans or SWMP that describe the soil or existing potential for soil erosion; PART I Permit No.: COR400000 Page 13 of 33 (e) a description of the percent of existing vegetative ground cover relative to the entire site and the method for determining the percentage; (f) a description of any allowable non-stormwater discharges at the site, including those being discharged under a division low risk discharge guidance policy; (g) a description of areas receiving discharge from the site. Including a description of the immediate source receiving the discharge. If the stormwater discharge is to a municipal separate storm sewer system, the name of the entity owning that system, the location of the storm sewer discharge, and the ultimate receiving water(s); and (h) a description of all stream crossings located within the construction site boundary. vii. Site Map. The SWMP must include a site map which includes, at a minimum, the following: (a) construction site boundaries; (b) flow arrows that depict stormwater flow directions on-site and runoff direction; (c) all areas of ground disturbance including areas of borrow and fill; (d) areas used for storage of soil; (e) locations of all waste accumulation areas, including areas for liquid, concrete, masonry, and asphalt; (f) locations of dedicated asphalt, concrete batch plants and masonry mixing stations; (g) locations of all structural control measures; (h) locations of all non-structural control measures; (i) locations of springs, streams, wetlands and other state waters, including areas that require pre-existing vegetation be maintained within 50 feet of a receiving water, where determined feasible in accordance with Part I.B.1.a.i.(d).; and (j) locations of all stream crossings located within the construction site boundary. viii. Final Stabilization and Long Term Stormwater Management. The SWMP must 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 are completed. Including but not limited to, detention/retention ponds, rain gardens, stormwater vaults, etc. ix. Inspection Reports. The SWMP must include documented inspection reports in accordance with Part ID. SWMP Review and Revisions PART I Permit No.: COR400000 Page 14 of 33 Permittees must keep a record of SWMP changes made that includes the date and identification of the changes. The SWMP must be amended when the following occurs: a change in design, construction, operation, or maintenance of the site requiring implementation of new or revised control measures; the SWMP proves ineffective in controlling pollutants in stormwater runoff in compliance with the permit conditions; control measures identified in the SWMP are no longer necessary and are removed; and corrective actions are taken onsite that result in a change to the SWMP. For SWMP revisions made prior to or following a change(s) onsite, including revisions to sections addressing site conditions and control measures, a notation must be included in the SWMP that identifies the date of the site change, the control measure removed, or modified, the location(s) of those control measures, and any changes to the control measure(s). The permittee must ensure the site changes are reflected in the SWMP. The permittee is noncompliant with the permit until the SWMP revisions have been made. SWMP Availability A copy of the SWMP must be provided upon request to the division, EPA, and any local agency with authority for approving sediment and erosion plans, grading plans or stormwater management plans within the time frame specified in the request. If the SWMP is required to be submitted to any of these entities, the submission must include a signed certification in accordance with Part I.A.3.e., certifying that the SWMP is complete and compliant with all terms and conditions of the permit. All SWMPs required under this permit are considered reports that must be available to the public under Section 308(b) of the CWA and Section 61.5(4) of the CDPS regulations. The permittee must 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. SITE INSPECTIONS Site inspections must be conducted in accordance with the following requirements. The required inspection schedules are a minimum frequency and do not affect the permittee’s responsibility to implement control measures in effective operating condition as prescribed in the SWMP. Proper maintenance of control measures may require more frequent inspections. Site inspections shall start within 7 calendar days of the commencement of construction activities on site. Person Responsible for Conducting Inspections The person(s) inspecting the site may be on the permittee’s staff or a third party hired to conduct stormwater inspections under the direction of the permittee(s). The permittee is responsible for ensuring that the inspector is a qualified stormwater manager. Inspection Frequency PART I Permit No.: COR400000 Page 15 of 33 Permittees must conduct site inspections in accordance with one of the following minimum frequencies, unless the site meets the requirements of Part ID.3 At least one inspection every 7 calendar days. Or At least one inspection every 14 calendar days, if post-storm event inspections are conducted within 24 hours after the end of any precipitation or snowmelt event that causes surface erosion. Post-storm inspections may be used to fulfill the 14-day routine inspection requirement. When site conditions make the schedule required in this section impractical, the permittee may petition the Division to grant an alternate inspection schedule. The alternative inspection schedule may not be implemented prior to written approval by the division and incorporation into the SWMP. Inspection Frequency for Discharges to Outstanding Waters Permittees must conduct site inspections at least once every 7 calendar days for sites that discharge to a water body designated as an Outstanding Water by the Water Quality Control Commission. Reduced Inspection Frequency The permittee may perform site inspections at the following reduced frequencies when one of the following conditions exists: Post-Storm Inspections at Temporarily Idle Sites For permittees choosing to combine 14-day inspections and post-storm-event- inspections, if no construction activities will occur following a storm event, post-storm event inspections must be conducted prior to re-commencing construction activities, but no later than 72 hours following the storm event. The delay of any post-storm event inspection must be documented in the inspection record. Routine inspections must still be conducted at least every 14 calendar days. Inspections at Completed Sites/Areas When the site, or portions of a site are awaiting establishment of a vegetative ground cover and final stabilization, the permittee must conduct a thorough inspection of the stormwater management system at least once every 30 days. Post-storm event inspections are not required under this schedule. This reduced inspection schedule is allowed if all of the following criteria are met: i. all construction activities resulting in ground disturbance are complete; 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 locate those areas to be inspected in accordance with the reduced schedule allowed for in this paragraph. Winter Conditions Inspections Exclusion PART I Permit No.: COR400000 Page 16 of 33 Inspections are not required for sites that meet all of the following conditions: 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 inspection exception is applicable only during the period where melting conditions do not exist, and applies to the routine 7-day, 14-day and monthly inspections, as well as the post-storm-event inspections. When this inspection exclusion is implemented, the following information must be documented in accordance with the requirements in Part II: i. dates when snow cover existed; ii. date when construction activities ceased; and iii. date melting conditions began. Inspection Scope Areas to be Inspected When conducting a site inspection the following areas, if applicable, must 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: i. construction site perimeter; ii. all disturbed areas; iii. designated haul routes; iv. material and waste storage areas exposed to precipitation; v. locations where stormwater has the potential to discharge offsite; and vi. locations where vehicles exit the site. Inspection Requirements i. Visually verify whether all implemented control measures are in effective operational condition and are working as designed in their specifications to minimize pollutant discharges. ii. Determine if there are new potential sources of pollutants. iii. Assess the adequacy of control measures at the site to identify areas requiring new or modified control measures to minimize pollutant discharges. iv. Identify all areas of non–compliance with the permit requirements and, if necessary, implement corrective action in accordance with Part IB.1.c. Inspection Reports The permittee must keep a record of all inspections conducted for each permitted site. Inspection reports must identify any incidents of noncompliance with the terms and conditions of this permit. Inspection records must be retained in accordance with Part II.O. and signed in accordance with Part I.A.3.f. At a minimum, the inspection report must include: i. the inspection date; PART I Permit No.: COR400000 Page 17 of 33 ii. name(s) and title(s) of personnel conducting the inspection; iii. weather conditions at the time of inspection; iv. phase of construction at the time of inspection; v. estimated acreage of disturbance at the time of inspection vi. location(s) of discharges of sediment or other pollutants from the site; vii. location(s) of control measures needing maintenance; viii. location(s) and identification of inadequate control measures; ix. location(s) and identification of additional control measures are needed that were not in place at the time of inspection; x. description of the minimum inspection frequency (either in accordance with Part I.D.2., I.D.3. or I.D.4.) utilized when conducting each inspection. xi. deviations from the minimum inspection schedule as required in Part I.D.2.; xii. after adequate corrective action(s) and maintenance have been taken, or where a report does not identify any incidents requiring corrective action or maintenance, the report shall contain a statement as required in Part I.A.3.f. DEFINITIONS For the purposes of this permit: (1) Bypass - the intentional diversion of waste streams from any portion of a treatment facility in accordance with 40 CFR 122.41(m)(1)(i) and Regulation 61.2(12). (2) 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, but remain related. The Division has determined that “contiguous” means construction activities located in close proximity to each other (within ¼ mile). Construction activities are considered to be “related” if they share the same development plan, builder or contractor, equipment, storage areas, etc. “Common plan of development or sale” includes construction activities that are associated with the construction of field wide oil and gas permits for facilities that are related. (3) Construction Activity - Ground surface disturbing and associated activities (land disturbance), 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 the original line and grade, hydraulic capacity, or original purpose of the facility. Activities to conduct repairs that are not part of routine maintenance or for replacement are construction activities and are not routine maintenance. Repaving activities where underlying and/or surrounding soil is exposed as part of the repaving operation are considered construction activities. Construction activity is from initial ground breaking to final stabilization regardless of ownership of the construction activities. (4) Control Measure - Any best management practice or other method used to prevent or reduce the discharge of pollutants to state waters. Control measures include, but are not limited to, best management practices. Control measures can include other methods such as the installation, operation, and maintenance of structural controls and treatment devices.