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HomeMy WebLinkAbout3.9.4 OXY CC SWMP Rev 12-2013STORMWATER MANAGEMENT PLAN FOR CONSTRUCTION ACTIVITIES Cascade Creek Common Plan of Development Garfield County, Colorado Prepared For: Nikirp,/ OXY USA WTP LP 760 Horizon Drive, Suite 101 Grand Junction, Colorado 81506 Prepared by: OLSSON ASSOCIATES Olsson Associates 760 Horizon Drive, Suite 102 Grand Junction, Colorado 81506 Project # 011-2824 Cascade Creek CPD SWMP in effect as of March 2009 Revision: Dec 2013 Administrative Log Cascade Creek Common Plan of Development OXY USA WTP LP Date: Editor: Edited Section and Page No: Change (s) to Stormwater Management Plan: 3/30/2010 Olsson 3.0a Update to legal and local contacts. 4/8/2010 Olsson 1.0 Combining permits. 5/21/2010 Olsson 3.0a Update to administrator, legal and local contact. 7/2010 Olsson 3.0a Update to stormwater administrator. 12/13/2010 Stormwater Administrator (C.Gudorf) Throughout Updates to SWMP. 4/20/2011 Stormwater Administrator (C.Gudorf) Sections: 1.0, 2.0, 3.0, 5.0 Updates to SWMP. 5/2/2011 Stormwater Administrator (C.Gudorf) Sections: 1.0, 2.0, 3.0, 5.0 Updates to SWMP. 06/06/2011 Stormwater Administrator (C.Gudorf) Table 3-7 06/28/2011 Stormwater Administrator (C.Gudorf) Pg. 2, 3, 24, 26, 30 Changes per Doug Weaver 10/062011 Stormwater Administrator (C.Gudorf) Site Maps in Section 2.0; Appendix A; 5.0.8; 1.0b Stormwater Site Maps; update to construction site boundary; CDPHE Modification form construction site boundary; update to SPCC inspection schedule; update to access roads. 10/21/2011 Stormwater Administrator (C.Gudorf) Site Maps in Section 2.0; Table 3 and Table 5. Updated site map to include new pipelines, updated table 3 and 5 to include new pipelines. 12/19/2011 Stormwater Administrator JC.Gudorf) Site Maps in Section 2.0; Updated site map to include new pipelines and well pads 2/29/2012 Stormwater Administrator (C.Gudorf) Tables 3, 4 & 5 Updated vegetation and receiving waters 3/6/2012 Stormwater Administrator (C.Gudorf) Tables 3 & 4 Updated vegetation and receiving waters 5/21/2012 Olsson Section 1.c Section 2.0 Tables 3, 5, 6 Removed Logan Wash Rd (/Trail Ridge Rd) from SWMP (Rec Waters Table, Veg Table, Seed Mixes, overall site maps); updated disturbed acreage. 6-2013 Olsson All SWMP updated/ re -written into new template, new overview maps 12-2013 Olsson 1.A, 1.C, Project Site Overview Map, NRCS Soils Units Map Disturbed acreage and overview maps updated to reflect sites added back into inspections after damage from July storm. OXY USA WTP LP, Certification Stormwater Management Plan for Cascade Creek Common Plan of Development Garfield County, Colorado Olsson Associates has prepared this Stormwater Management Plan for Construction Activities for OXY USA WTP LP for the Cascade Creek Common Plan of Development 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: Chris Clark Title: Operations Manager Date: TABLE OF CONTENTS INTRODUCTION 1 Stormwater Runoff Permitting Requirements 1 Project Description 1 1. CONSTRUCTION SITE DESCRIPTION 2 1.A Nature of Construction Activity 2 1.6 Sequence of Construction Activities 2 1.0 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 6 1.F Potential Pollution Sources and Locations 7 1.G Non-Stormwater Discharges 7 1.H Receiving Waters 7 2. SITE MAP(S) 7 2. A Construction Site Boundaries 7 2. B Areas of Ground Disturbance 7 2. C Areas of Cut and Fill 7 2. D Storage Areas 7 2. E Location of Asphalt and Concrete Batch Plants 7 2. F Locations of Structural BMPs 7 2. G Locations of Non -Structural BMPs 7 2. H Locations of Springs, Streams, Wetlands and Other Surface Waters 7 3. STORMWATER MANAGEMENT CONTROLS 8 3.A Stormwater Administrator 8 3.B Potential Pollutant Sources 8 3.0 BMPs for Stormwater Pollution Prevention 9 3.C.1 Structural Practices for Erosion and Sediment Control 9 3.C.2 Non -Structural Practices for Erosion and Sediment Control 9 3.C.3 Phased BMP Installation 9 3.C.4 Materials Handling and Spill Prevention 10 3.C.5 Dedicated Asphalt or Concrete Batch Plants 11 3.C.6 Vehicle Tracking 11 3.C.7 Waste Management and Disposal, Concrete Washout, and Contaminated Soils 12 3.C.8 Ground Water and Stormwater Dewatering 12 4. FINAL STABILIZATION AND LONG TERM STORMWATER MANAGEMENT 12 5. INSPECTIONS AND MAINTENANCE PROCEDURES 13 OXY USA WTP LP i Olsson Associates Cascade Creek SWMP LIST OF TABLES Table 1 Table 2 Table 3 Table 1-1 Table 3-1 Vegetation Descriptions Typical Seed Mixture Down -Hole Chemicals/MSDS Inventory Soils Data and Erosion Potential BMP Phasing LIST OF FIGURES Figure 1 Project Site Overview (/Receiving Waters) Map LIST OF APPENDICES Appendix A Certification: COR -038414, General Permit: COR -030000, and Related Docs Appendix B NRCS Soil Unit Map & Soil Descriptions Appendix C Inspection Report Form and Example Site Map Appendix D Best Management Practice (BMP) Manual Appendix E BLM Gold Book, Chapters 4 and 6 OXY USA WTP LP ii Olsson Associates Cascade Creek SWMP INTRODUCTION This Stormwater Management Plan (SWMP) for Construction Activities is written to comply with the Colorado Department of Public Health and Environment (CDPHE)'s General Permit No. COR -030000, issued on July 1, 2007 and administratively continued on June 30, 2012 to remain in effect until the new permit being developed by the Water Quality Control Division is issued and effective, and with related U.S. Environmental Protection Agency (USEPA) National Pollutant Discharge Elimination System (NPDES) stormwater regulations. This SWMP addresses construction activities associated with OXY USA WTP LP (Oxy)'s oil and gas exploration and production activities at the Cascade Creek Common Plan of Development (Cascade Creek), in Garfield County, Colorado. A copy of the certification to discharge (COR - 038414), the Colorado Discharge Permit System (CDPS) general permit (COR -030000), and 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 EPA 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 EPA 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. Project Description Oxy's Cascade Creek area is located in Garfield County, Colorado, north of the town of De Beque. The project site is divided into three smaller well fields: Mesa, Valley, and Logan Wash. The three fields are located within Township 5 through 8 South, Range 96 and 97 West, of the 6th PM. See Figure 1 for an overview map of the project site. The current drilling and development plan includes well pad, access road, and pipeline construction, well drilling, well testing, well completion, and installation of associated facilities. OXY USA WTP LP 1 Olsson Associates Cascade Creek SWMP 1. CONSTRUCTION SITE DESCRIPTION The following section provides a description of the construction activities. 1.A Nature of Construction Activity Construction at Cascade Creek will be performed using conventional cut and fill earthmoving techniques and trenching. The total estimated disturbance for all current and planned pads, pipelines, and access roads is approximately 800 acres. 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 E. 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 BMPs 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. Blasting is also used in some areas. 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, BMPs that will be utilized to control stormwater throughout the life of the facility will be constructed during this phase. Sediment discharge is the main potential pollutant of concern during access road and pad construction. 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. 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 OXY USA WTP LP 2 Olsson Associates Cascade Creek SWMP 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 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 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. Sediment discharge, unused mud chemicals and/or well casing materials, used drilling water/mud, and petroleum products are potential pollutants of concern during this phase of construction. Procedures will also be implemented for prompt containment and remediation of any spills that may occur during the drilling phase. These procedures are outlined in Oxy's Cascade Creek Spill Prevention, Control and Countermeasures (SPCC) plan. 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 well completion phase. 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 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 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. OXY USA WTP LP 3 Olsson Associates Cascade Creek SWMP Sediment discharge, unused and used chemicals, frac water, and small amounts of equipment lubricant or fuel are potential pollutants of concern during this phase of construction. Procedures outlined in the SPCC plan will also be implemented for prompt containment and remediation of any spills that may occur. 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. 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 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. Sediment discharge, produced fluids, and small amounts of equipment lubricant, fuel, corrosion inhibitors or other chemicals are potential pollutants of concern during this phase. Procedures outlined in the SPCC plan will also be implemented for prompt containment and remediation of any spills that may occur. 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. Sediment discharge, produced fluids, and small amounts of equipment lubricant, fuel, corrosion inhibitors or other chemicals are potential pollutants of concern during this phase of construction. Procedures outlined in the SPCC plan will also be implemented for prompt containment and remediation of any spills that may occur. 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. Final reclamation When the production of a well is exhausted, it will be abandoned. Upon well abandonment 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, by redistributing the stockpiled topsoil, seeding of disturbed soil areas in order to reestablish cover vegetation, and by construction of any permanent erosion and sediment control structures as needed. Sediment discharge is the main potential pollutant of concern during this phase. 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. OXY USA WTP LP 4 Olsson Associates Cascade Creek SWMP 1.0 Estimate of Total Area of Site and Area to be Disturbed The total project site encompasses approximately 29,800 acres. The total disturbed acreage for the project is approximately 800 acres. As new sites are added to the project site, or as sites reach final stabilization and are removed from the permit, the SWMP 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 areas of disturbance are: Biedsaw-Sunup gravelly loams, 10 to 40 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-Rock outcrop association, 25 to 65 percent slopes; Northwater loam, 15 to 65 percent slopes; Northwater-Adel complex, 5 to 50 percent slopes; Parachute-Irigul complex, 5 to 30 percent slopes; Parachute-Irigul-Rhone association, 25 to 50 percent slopes; Parachute -Rhone loams, 5 to 30 percent slopes; Silas loam, 1 to 12 percent slopes; Tosca channery loam, 25 to 80 percent slopes; and Utso-Rock outcrop complex, 40 to 90 percent slopes. The major soil types are moderately well to well drained soils with a very low to very high (-2.7 inches to -26.7 inches) water holding capacity. A Natural Resources Conservation Services (NRCS) unit map and soils descriptions for the dominant soils in the construction areas are provided in Appendix B. The K -factor approximates soil detachment due to runoff and raindrop impact. Lower k -Factor values (0.1 - 0.17) indicate Tess 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 for Cascade Creek is approximately 25 to 30 inches (Western Regional Climate Center map - http://www.wrcc.dri.edu/pcpn/co.gif). Table 1-1 shows the soils data and erosion potential for each major soil within the areas that will undergo construction. OXY USA WTP LP 5 Olsson Associates Cascade Creek SWMP Table 1-1 Soils Data and Erosion Potential 1.E Vegetation Description and Estimate Existing vegetation surrounding the areas of disturbance includes but is not limited to: grasses, sagebrush, aspen, serviceberry, and scrub oak. Percent ground cover ranges from 50 to 90 percent. Specific existing vegetation descriptions and percents ground cover for each site are listed in Table 1. OXY USA WTP LP Cascade Creek SWMP 6 Olsson Associates Representative Value Soil Name Hydrologic Group K -factor % Sand % Silt % Clay Biedsaw-Sunup gravelly loams Biedsaw C 0.37 39.2 37.3 23.5 Sunup D 0.37 39.8 37.7 22.5 Debeque very channery loam Debeque B 0.28 42.1 37.9 20 Grobutte very channery loam Grobutte B 0.28 38.5 36.5 25 Happle very channery sandy loam Happle B 0.28 65.1 18.9 16 Happle-Rock outcrop association Happle B 0.28 65.1 18.9 16 Rock Outcrop D - - - - Northwater loam Northwater B 0.2 39.2 37.3 23.5 Northwater-Adel complex Northwater B 0.2 43 38.5 18.5 Adel B 0.15 35.4 33.6 31 Parachute-Irigul complex Parachute B 0.2 42.1 37.9 20 Irigul D 0.28 39.8 37.7 22.5 Parachute-Irigul-Rhone association Parachute B 0.2 42.1 37.9 20 Irigul D 0.28 39.8 37.7 22.5 Rhone B 0.2 39.2 37.3 23.5 Parachute -Rhone loams Parachute B 0.2 42.1 37.9 20 Rhone B 0.2 39.2 37.3 23.5 Silas loam Silas B 0.2 39.2 37.3 23.5 Tosca channery loam Tosca B 0.28 44.3 40.7 15 Utso-Rock outcrop complex Utso B 0.28 44.3 40.7 15 Rock Outcrop D - - - - 1.E Vegetation Description and Estimate Existing vegetation surrounding the areas of disturbance includes but is not limited to: grasses, sagebrush, aspen, serviceberry, and scrub oak. Percent ground cover ranges from 50 to 90 percent. Specific existing vegetation descriptions and percents ground cover for each site are listed in Table 1. OXY USA WTP LP Cascade Creek SWMP 6 Olsson Associates 1.F Potential Pollution Sources and Locations The potential pollution sources for each phase of construction are discussed in Sections 1.B Sequence of Construction Activities and 3.B Potential Pollutant Sources. The locations of the 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 Oxy's Cascade Creek area lies within the Colorado River watershed. The majority of the project site drains to the southwest via numerous named and unnamed tributaries of Roan Creek. The north and east edges of the project site drain to numerous named and unnamed tributaries of Parachute Creek. Roan Creek and Parachute Creek terminate at the Colorado River. Mount Callahan Road, which is the eastern portion of the Oxy's Logan Wash area, drains partly to unnamed tributaries of Smith Gulch and Kelly Gulch, which are direct tributaries of the Colorado River. For more detail, refer to Figure 1, the overview map and/or to the individual site maps. 2. SITE MAP(S) The site maps for Cascade Creek will be maintained within Oxy's stormwater database. The maps will be regularly updated to reflect all changes to the sites, and additional maps will be created in response to planned field activities. An example site map is included in Appendix C. 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 BMPs For an accurate representation of the location of structural BMPs, refer to the site maps. 2. G Locations of Non -Structural BMPs For an accurate representation of the location of non-structural BMPs, 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 the overview map, Figure 1 and/or to the site maps. OXY USA WTP LP 7 Olsson Associates Cascade Creek SWMP 3. STORMWATER MANAGEMENT CONTROLS 3.A Stormwater Administrator The SWMP Administrator for Cascade Creek is Oxy's HES Advisor. The SWMP Administrator is responsible for developing, implementing, maintaining and revising the SWMP as necessary. The administrator may delegate the SWMP inspections and maintenance of records to qualified personnel. 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. Outdoor storage activities: The construction contractor will maintain a laydown or staging area for equipment and material storage on site. Depending on the work phase of the site, chemicals and/or other drilling materials may be stored on site, and tanks used to store fuels or production - related liquids may be present. These storage activities are discussed in more detail in 1.B Sequence of Construction Activities. An inventory of down -hole chemicals used for Oxy wells is included as Table 3. 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 a possible at the sites in order to achieve successful revegetation of disturbed areas. See also "vehicle and equipment maintenance and fueling" above. 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 OXY USA WTP LP 8 Olsson Associates Cascade Creek SWMP 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. Spills or leaks from potential sources are described in the SPCC plan. Response to certain events may require specialized training due to health and safety concerns. The locations of potential pollutant sources are shown on the site maps. BMPs utilized to address potential pollutant sources are described in Section 3. 3.0 BMPs for Stormwater Pollution Prevention This section describes the BMPs that will be used at Cascade Creek for stormwater pollution prevention. Oxy's BMP Manual containing the BMPs which may be implemented is included in Appendix D. BMPs may be added or removed from the manual to accommodate changes in site conditions and activities at Cascade Creek. Run-on protection and run-off controls will be installed prior to the beginning of construction activities, as practicable, with consideration given to worker safety and site access. Additional structural and non-structural Best Management Practices (BMPs) will likely need to be installed during and following construction. 3.C.1 Structural Practices for Erosion and Sediment Control Descriptions, design and installation practices, and maintenance and removal considerations for the structural BMPs available for use can be found in the BMP Manual. The location of all structural BMPs will be found on the site maps. 3.C.2 Non -Structural Practices for Erosion and Sediment Control Descriptions, design and installation practices, and maintenance and removal considerations for the non-structural BMPs available for use can be found in the BMP manual. The location of all non-structural practices will be found on the site maps. 3.C.3 Phased BMP Installation The project will be phased to the extent practical to limit the amount of disturbed area that is exposed at any given time. BMP implementation will be coordinated with the various stages of construction. BMPs to control erosion and sediment transport will be installed prior to earth disturbing activities. If additional areas are disturbed, BMPs will be implemented prior to the start of ground disturbing activities in those areas. As portions of the site are completed and previously disturbed areas are stabilized or the BMP is no longer needed, they will be removed. 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 stabilize a disturbed area after a disturbance has been completed or where significant ground disturbance activity ceases, temporary erosion control measures will be implemented as soon as practicable. Table 3-1 below outlines the BMPs to be implemented during each phase of the project. OXY USA WTP LP 9 Olsson Associates Cascade Creek SWMP Table 3-1 BMP Phasing Project Phase BMPs to be implemented during each phase Pre-Disturbance/Site Preparation • Prepare stabilized staging area. • Install vehicle tracking pad, geotextile, or mud mats where applicable to provide designated access into the ROW. • Installation of perimeter control BMPs • Limit access to areas that are not to be disturbed protecting the existing vegetation. Construction • Locate stockpiles in work areas with perimeter BMPs. • Install BMPs per details in the BMP manual. • Leave disturbed area of site in a surface roughened condition when feasible. • Protect, inspect and repair BMPs as necessary. Post -construction • Maintenance and repair of BMPs installed during previous phases. • Stabilize surface with gravel when feasible • Inspection of BMPs Final Stabilization • Perform seeding and mulching or the installation of erosion control blankets where applicable. • Remove all non -biodegradable temporary BMPs when applicable. 3.C.4 Materials Handling and Spill Prevention Spills or leaks from potential pollution sources will be handled as described in Oxy's SPCC plan. 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 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 form 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 OXY USA WTP LP 10 Olsson Associates Cascade Creek SWMP Drums (if present) will be kept off the ground, within secondary containment. 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 kept off the ground, and stored in original packaging and/or otherwise covered, 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 All spills and releases of exploration and production waste or produced fluid exceeding 5 barrels (210 gallons) including those contained within unlined berms, shall be reported in writing on the COGCC Spill/Release Report Form 19 within 10 days of discovery of the spill. All spills/releases that exceed 20 barrels (840 gallons) of exploration and production liquids/waste shall be verbally reported to the COGCC at (303) 894-2100 within 24 hours of discovery. Spills or releases of any size that impact or threaten to impact any waters of the state, residence or occupied structure, livestock or public byway, shall be verbally reported to the COGCC as soon as practical after discovery (COGCC Rule 906). If the spill may potentially reach waters of the state (which includes surface water, ground water and dry gullies or storm sewers leading to surface water), it must also be reported immediately to the CDPHE at 1-877-518-5608. Spills or releases of more than 25 gallons of refined petroleum crude oil products such as gasoline, diesel fuel, oil, or derivatives of mineral, animal or vegetable oil shall be reported to the CDPHE at 1-877-518-5608, within 24 hours. A hazardous substance release in any amount which enters or threatens to enter waters of the state shall be reported to the CDPHE. 3.C.5 Dedicated Asphalt or Concrete Batch Plants Dedicated asphalt or concrete batch plants are not anticipated within the project site. 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 OXY USA WTP LP Cascade Creek SWMP 11 Olsson Associates methods, such as road base and chemical stabilizers and stabilized construction entrances will be used where practicable. The location of vehicle tracking controls will be shown on the site map. 3.C.7 Waste Management and Disposal, Concrete Washout, and Contaminated Soils Waste Management and Disposal Construction -related and other trash will be collected in covered containers and hauled off-site for disposal in suitable landfills. Used drilling water and mud will be remediated or disposed of in accordance with COGCC rules. 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. The locations of any waste containments on site are shown on the site maps. Concrete Washout Concrete washout is not anticipated within the project site. 3.C.8 Ground Water and Stormwater Dewatering No groundwater dewatering is anticipated at this time. If groundwater is encountered, the dewatering of the site will be regulated by a dewatering permit issued through CDPHE. All stormwater will be diverted by berms and/or diversion ditches to avoid contact with the groundwater. If the need for stormwater dewatering is encountered, appropriate erosion and sediment control BMPs, as described in the BMP manual, will be utilized to minimize erosion and trap sediment. 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. The approved seed mix and application rates for Cascade Creek are presented in Table 2. Specific BMPs 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 BMPs chosen will be shown on the individual site maps. 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. Once stabilized, the site will be removed from this SWMP for sediment controls. However, if petroleum hydrocarbons or other chemicals affect stormwater as a result of industrial activities on-site, the site will maintain permit coverage. Permanent BMPs may be left in place if it is deemed necessary to maintain site stability. OXY USA WTP LP 12 Olsson Associates Cascade Creek SWMP 5. INSPECTIONS AND MAINTENANCE PROCEDURES Site inspections will be conducted with the requirements and minimum schedule as outlined in Part I.D.6 of the CDPS general permit (COR -030000). The requirements are as follows: All active construction sites will be inspected at a minimum of at least once every 14 calendar days, and within 24 hours after the end of any precipitation or snowmelt event that causes surface erosion. If a site is considered temporarily idle, that is, no construction activities will occur following a storm event, than 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. For sites or portions of sites in which all construction activities that will result in ground disturbance are completed, and all activities for final stabilization, as outlined above in section 4, with the exception of vegetative coverage are completed, inspections will be conducted at least once every month, and post -storm inspections are not required. Inspections are not required at sites where snow cover exists over the entire site for an extended period of time as long as melting conditions do not exist. 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. Also, all erosion and sediment control practices identified in this SWMP will 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. Location(s) of discharges of sediment or other pollutants from the site iv. Location(s) of BMPs that need to be maintained v. Location(s) of BMPs that failed to operate as designed or proved inadequate for a particular location vi. Location(s) where additional BMPs are needed that were not in place at the time of inspection vii. Deviations from the minimum inspection schedule as outlined above viii. 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 OXY USA WTP LP 13 Olsson Associates Cascade Creek SWMP ix. 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 BMPs are needed, then the Stormwater Administrator for Oxy will be contacted and they will direct a subcontractor to perform the proper actions. BMPs 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 BMPs 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 BMPs. All inspection records will be kept and maintained in Oxy's stormwater database for a minimum of three years from expiration or inactivation of permit coverage. An example report is included in Appendix C. OXY USA WTP LP 14 Olsson Associates Cascade Creek SWMP Tables Figures Appendix A Certification, General Permit, and Related Documents Site Termination Forms Appendix B NRCS Soil Unit Map Soil Descriptions Appendix C Inspection Report Form Example Site Map Appendix D BMP Manual Appendix E BLM Gold Book, Chapters 4 and 6