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Home My WebLink About1.00 General Application Materials_Part14CONSTRUCTION LAYOUT - CROSS SECTIONS SURVEYED BY DRAWN BY SCALE AS SHOWN DAYTON SLAUGH 06-29-23 T.L.L.07-10-23 SKR #698-10-BV PADTRACT 72, SECTIONS 10 & 15, T6S, R98W, 6th P.M.GARFIELD COUNTY, COLORADO CHEVRON U.S.A. INC. UELS, LLCCorporate Office * 85 South 200 EastVernal, UT 84078 * (435) 789-1017 ENGINEERING & LAND SURVEYING EXISTING PAD SURFACE DISTURBANCE ±3.814 ACRES APPROXIMATE WELL SITE DISTURBANCE AREAS EXISTING CONSTRUCTION DISTURBANCE ±2.348 TOTAL OIL & GAS LOCATION ±6.859 TOTAL OIL & GAS LOCATION (LOD) N/A ±6.859NA ±29' ACRESDISTANCE APPROXIMATE SURFACE DISTURBANCE AREAS TOTAL SURFACE USE AREA ±16.442 H A R O LD N E L S ON M A R S HALL 32000 COL O R A D O REGIS T E R E D P R O F E S SIONAL E N G I N EER 11-17-23 EXISTING ACCESS ROAD DISTURBANCE N/A±388' ±9.109±4,981'80' WIDE PROPOSED FLUIDS PIPELINE R-O-W DISTURBANCE (OUTSIDE LOD)PROPOSED CONSTRUCTION DISTURBANCE ±0.697 REV: 4 11-16-23 T.L.L. (UPDATE LOD & ACREAGES) ±0.374±207'80' WIDE PROPOSED GAS FLOWLINE R-O-W DISTURBANCE (OUTSIDE LOD) N/A±30'80' WIDE PROPOSED GAS FLOWLINE R-O-W DISTURBANCE (WITHIN LOD) 80' WIDE PROPOSED FLUIDS PIPELINE R-O-W DISTURBANCE (WITHIN LOD) ADDITIONAL PROPOSED ACCESS ROAD SURFACE DISTURBANCE ±0.100±110' 523 CONSTRUCTION LAYOUT - CROSS SECTIONS SURVEYED BY DRAWN BY SCALE AS SHOWN DAYTON SLAUGH 06-29-23 T.L.L.07-10-23 SKR #698-10-BV PADTRACT 72, SECTIONS 10 & 15, T6S, R98W, 6th P.M.GARFIELD COUNTY, COLORADO CHEVRON U.S.A. INC. UELS, LLCCorporate Office * 85 South 200 EastVernal, UT 84078 * (435) 789-1017 ENGINEERING & LAND SURVEYING H A R O LD N E L S ON M A R S HALL 32000 COL O R A D O REGIS T E R E D P R O F E S SIONAL E N G I N EER 11-17-23 REV: 2 11-16-23 T.L.L. (UPDATE LOD) 524 UELS, LLCCorporate Office * 85 South 200 EastVernal, UT 84078 * (435) 789-1017 ENGINEERING & LAND SURVEYING PRELIMINARY DRILL RIG LAYOUT SURVEYED BY DRAWN BY SCALE 1" = 60' NOTES: ·Contours shown at 2' intervals. DAYTON SLAUGH 06-29-23 T.L.L.07-10-23 SKR #698-10-BV PADTRACT 72, SECTIONS 10 & 15, T6S, R98W, 6th P.M.GARFIELD COUNTY, COLORADO CHEVRON U.S.A. INC. 60 ' 30 ' 0'60 ' 38130 O LL A H S R AMN HAROL D N ELS O L,&E N S E D&OL O R A D 8S R 9E<OR AL N DO,NA S S E ) O R 3 L REV: 4 11-16-23 T.L.L. (REMOVE FLARE STACK & UPDATE LOD & EXISTING DISTURBANCE) 525 Sand Pad 100'X100' T- b e l t Sand Offload lll l l l l l l l l l l l lll l l l l l l l l l l l lll l l l l l l l l l l l lll l l l l l l l l l l l lll l l l l l l l l l l l lll l l l l l l l Fl o w B a c k Fl o w B a c k Fl o w B a c k Op e n T o p Op e n T o p Op e n T o p Fl o w B a c k AC I D Fu e l FR AFAS UNIT CV X H S E H o u s e FR CV X W S R H o u s e CV X W S R O f f i c e CV X W S R H o u s e BOS Q U E CLO 2 WL R U N W A Y CV X W S R H o u s e MEET I N G T R A I L E R UELS, LLCCorporate Office * 85 South 200 EastVernal, UT 84078 * (435) 789-1017 ENGINEERING & LAND SURVEYING SURVEYED BY DRAWN BY SCALE 1" = 60' NOTES: ·Contours shown at 2' intervals. DAYTON SLAUGH 06-29-23 T.L.L.010-25-23 SKR #698-10-BV PADTRACT 72, SECTIONS 10 & 15, T6S, R98W, 6th P.M.GARFIELD COUNTY, COLORADO CHEVRON U.S.A. INC. 60 ' 30 ' 0'60 ' 38130 O LL A H S R AMN HAROL D N E LS O L,&E N S E D&OLO R A D 8S R9E<OR AL N DO,NA S S E ) O R3 L PRELIMINARY HYDRAULIC STIMULATION LAYOUT REV: 1 11-16-23 T.L.L. (REMOVE FLARE STACK & UPDATE LOD & EXISTING DISTURBANCE) 526 UELS, LLCCorporate Office * 85 South 200 EastVernal, UT 84078 * (435) 789-1017 ENGINEERING & LAND SURVEYING SURVEYED BY DRAWN BY SCALE 1" = 60' DAYTON SLAUGH 06-29-23 T.L.L.07-10-23 SKR #698-10-BV PADTRACT 72, SECTIONS 10 & 15, T6S, R98W, 6th P.M.GARFIELD COUNTY, COLORADO CHEVRON U.S.A. INC. 60 ' 30 ' 0'60 ' FACILITY LAYOUT H A R O LD N E L S ON M A R S HALL 32000 COL O R A D O REGIS T E R E D P R O F E S SIONAL E N GI N EER 11-17-23 REV: 2 11-16-23 T.L.L. (MOVE TANK & UPDATE LOD & EXISTING DISTURBANCE) 527 UELS, LLCCorporate Office * 85 South 200 EastVernal, UT 84078 * (435) 789-1017 ENGINEERING & LAND SURVEYING NOTES: ·Contours shown at 2' intervals. APPROXIMATE UN-RECLAIMED ACREAGE = ±2.349 ACRES APPROXIMATE RECLAIMED ACREAGE = ±4.510 ACRES TOTAL ACREAGE = ±6.859 ACRES INTERIM RECLAMATION LAYOUT SURVEYED BY DRAWN BY SCALE 1" = 60' 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. 60 ' 30 ' 0'60 ' T.L.L.07.10-23 H A R O LD N E L S ON M A R S HALL 32000 COL O R A D O REGIS T E R E D P R O F E S SIONAL E N G I N EER 11-17-23 Proposed Gas Flowline Disturbance (Within LOD) (To Be Reclaimed)±30'N/A ±207'80Proposed Gas Flowline Disturbance (Outside LOD) (To Be Reclaimed) Proposed Fluids Pipeline Disturbance (Within LOD) (To Be Reclaimed)±30'N/A ±4,981'80Proposed Fluids Pipeline Disturbance (Outside LOD) (To Be Reclaimed) Length (ft)Width (ft) REV: 4 11-16-23 T.L.L. (UPDATE EQUIPMENT, LOD & EXISTING DISTURBANCE) 528 INTERIM RECLAMATION - CROSS SECTIONS SURVEYED BY DRAWN BY SCALE AS SHOWNUELS, LLCCorporate Office * 85 South 200 EastVernal, UT 84078 * (435) 789-1017 ENGINEERING & LAND SURVEYING 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. T.L.L.07-10-23 REV: 2 11-16-23 T.L.L. (UPDATE LOD) H A R O LD N E L S ON M A R S HALL 32000 COL O R A D O REGIS T E R E D P R O F E S SIONAL E N G I N EER 11-17-23 529 ENGINEERING & LAND SURVEYING UELS, LLC Corporate Office * 85 South 200 East Vernal, UT 84078 * (435) 789-1017 LOCATION PHOTOS AERIAL SCALE 1" = 500' LEGEND: WORKING PAD SURFACEEXISTING ACCESS ROADNORTH FIELD OF VIEW STANDING POINT EAST FIELD OF VIEWSOUTH FIELD OF VIEWWEST FIELD OF VIEW 50 0 ' 25 0 ' 0'50 0 ' TAKEN BY DRAWN BY DAYTON SLAUGH 06-29-23 T.L.L.07-10-23 SKR #698-10-BV PADTRACT 72, SECTIONS 10 & 15, T6S, R98W, 6th P.M.GARFIELD COUNTY, COLORADO CHEVRON U.S.A. INC. REV: 1 08-02-23 T.L.L. (UPDATE TITLE BLOCK) 530 CAMERA ANGLE: NORTHERLY CAMERA ANGLE: EASTERLYPHOTO: VIEW OF LOCATION STAKE PHOTO: VIEW OF LOCATION STAKE UELS, LLC Corporate Office * 85 South 200 East Vernal, UT 84078 * (435) 789-1017 ENGINEERING & LAND SURVEYING LOCATION PHOTOS PHOTO 1 TAKEN BY DRAWN BY LOCATION STAKE LOCATION STAKE DAYTON SLAUGH 06-29-23 T.L.L.07-10-23 SKR #698-10-BV PADTRACT 72, SECTIONS 10 & 15, T6S, R98W, 6th P.M.GARFIELD COUNTY, COLORADO CHEVRON U.S.A. INC. REV: 1 08-02-23 T.L.L. (UPDATE TITLE BLOCK) 531 CAMERA ANGLE: SOUTHERLY CAMERA ANGLE: WESTERLYPHOTO: VIEW OF LOCATION STAKES PHOTO: VIEW OF LOCATION STAKES UELS, LLC Corporate Office * 85 South 200 East Vernal, UT 84078 * (435) 789-1017 ENGINEERING & LAND SURVEYING LOCATION PHOTOS PHOTO 2 TAKEN BY DRAWN BY LOCATION STAKE DAYTON SLAUGH 06-29-23 T.L.L.07-10-23 SKR #698-10-BV PADTRACT 72, SECTIONS 10 & 15, T6S, R98W, 6th P.M.GARFIELD COUNTY, COLORADO CHEVRON U.S.A. INC. LOCATION STAKE REV: 1 08-02-23 T.L.L. (UPDATE TITLE BLOCK) 532 Chevron Rockies Business Unit Chevron Energy, Inc. 2001 16th Street, Suite 900 Denver, Colorado, 80202 ECMC Wildlife Mitigation Plan- Skinner Ridge OGDP SKR 698-10-BV Drill Pad Per the Colorado Energy and Carbon Management Commission (ECMC) 300 Series and 1200 Series Rules for the protection of wildlife and habitat, Chevron is presenting this Wildlife Mitigation Plan for the proposed Skinner Ridge OGDP SKR 698-10-BV drill pad. The OGDP SKR 698-10- BV drill pad includes a single existing pad with the potential to drill up to two wells with a collocated gas production facility, and lies within T6S, R98W, Section 15 (NW/NW) and Section 10 (SW/SW) (Figure 1). The evaluations herein are submitted in support of the ECMC 2A permitting process, and specifically the SKR 698-10-BV drill pad, and pursuant to Rule 304.c.(17) Wildlife Mitigation Plan (WMP), and Rule 1201.b for an Oil and Gas location inside High Priority Habitat (HPH). It should be noted that figures supporting this WMP are schematic representations used for approximate presentation of environmentally sensitive habitat in the project area, and that full design drawings should be referenced for detailed location placement and analysis. Environmental Summary Chevron’s SKR 698-10-BV project will utilize an existing drill pad that was permitted for Oil and Gas development under O&G Location ID Number 336056 but was never used for oil and gas purposes. The pad has been dedicated for equipment/materials staging and storage, as permitted through Garfield County. The proposed development pad will include a collocated gas processing facility on pad. The entire well pad lies within 500’ of the Ordinary High Water Mark (OHWM) of Deer Park Gulch (aka Tom Creek) designated as 1202.c.(1).S Sportfish Management Waters HPH, and approximately ½ of the pad lies within 300’ of the OHWM. The proposed development pad also lies entirely within 1202.d.(2) Elk Winter Concentration Area HPH and Elk Severe Winter Range HPH, with a protective timing stipulation between December 1st and April 15th. 533 November 29, 2023 Page 2 of 15 2001 16th Street, Suite 900 Denver, Colorado 80202 FIGURE 1- SKR 698-10-BV Well Pad As stated, the Deer Park Gulch drainage is identified as a Sportfish Management-protected HPH, and Chevron pre-consulted with CPW pursuant to the potential need for a request to the Commission for approval of a Rule 502 Variance as it relates to Rule 1202.c(1).S. (i.e., Sportfish management waters not identified by CPW as “Gold Medal” (within 500 feet of OHWM)). CPW Northwest Energy liaison Taylor Elm reviewed the SKR 698-10-BV location and determined that although the location does fall within Rule 1202.c.(1).S. HPH, the applicability of waiver provisions of Rule 309.e.(5).D.ii.bb would be appropriate to Deer Park Gulch. The Rule provision allows for CPW to grant a waiver for an intermittent drainage anywhere within the 500-foot Aquatic HPH buffer area, instead of within 300 to 500 feet of the OHWM, as would be the case if Deer Park Gulch were a perennial waterway. The waiver request was reviewed and approved by CPW on 11/16/23 and Chevron committed to the Best Management Practices (BMPs) documented in the waiver request and reiterated below under the Field Hydrology Review section. All upgrades, with the exception of a slight expansion to the pad, will remain within the approved disturbed area (DA) and avoid any direct impact to water way features; a flowline to the existing gas processing plant is in-place along CR211 (Clear Creek Road) just southwest of the SKR 698- 10-BV DA and the gas tie-in (approximately 90 feet in length) will not impact any sensitive water way or wetland features classified as 1202.c.(1) Q,R or S HPH. The liquid line tie-in will be installed within the existing Clear Creek Road pipeline ROW up to the SKR 698-09-AV pad approximately 4981 feet to the north (Figure 2). 534 November 29, 2023 Page 3 of 15 2001 16th Street, Suite 900 Denver, Colorado 80202 FIGURE 2- Liquids (Red) and Gas (Yellow) Flowline Tie-in; SKR 698-10-BV Well Pad to the SKR 698-09-AV Well Pad The extent of the proposed activities also includes freshwater sourcing from the Colorado River. Source water for drilling and completion activities will be pumped from the Kobe Water Facility and along a federal Right-of-Way (ROW) evaluated and approved by the Bureau of Land Management (BLM) in 2023 for earlier well completion activities in Skinner Ridge and initiated in August 2023. The temporary ROW authorization (COC-80860) is good for a three-year term and will be utilized for Chevron’s well drilling under this project as well. The temporary source water flowline will include approximately 12 miles of surface flat-lay flowline and pump stations along existing water diversion and access road disturbances, up to the Skinner Ridge 66S98W/22NENW water staging pad (Location ID# 324358, aka SKR 22-1) and then to the SKR 698-10-BV well pad by means of a surface-lay line and two booster pumps (Figure 3). The SKR 22-1 will utilize a Modular Large Volume Tank (MLVT) on the pad working surface for fresh water staging in support of well completion activities. The SKR 22-1 pad and proposed surface-lay freshwater line to the SKR 698- 535 November 29, 2023 Page 4 of 15 2001 16th Street, Suite 900 Denver, Colorado 80202 10-BV pad are located within the Clear Creek Sportfish Management Waters HPH 500-foot offset. Water sourcing activities were included in the CPW waiver request document for the project. FIGURE 3- Fresh Water Sourcing from the SKR 22-1 Pad to the SKR 698-10-BV Well Pad 536 November 29, 2023 Page 5 of 15 2001 16th Street, Suite 900 Denver, Colorado 80202 Field Hydrologic Review Hydrologic field review (Aquatic Resource Inventory) of the SKR 698-10-BV project was performed by a SWCA Environmental Services Professional Wetland Scientist (PWS) the week of July 21st, 2023. Survey activities were performed based on existing hydrologic features identified in the field including National Wetland Inventory (NWI)-mapped wetlands, National Hydrography Dataset (NHD) delineations, and the features presented on the SKR 698-10-BV Well Pad Hydrology Map submitted with the 2A application packet to ECMC. As depicted on Figure 4, SWCA confirmed that Deer Park Gulch (aka Tom Creek and dry at the time of inspection) which can seasonally hold water and has a defined OHWM is identified as Sportfish Management Waters HPH, and is located ±150 feet southeast of the pad’s permitted DA. Also, an agricultural ditch (holding water at the time of inspection) was identified ±343 feet southwest of the pad’s DA. No other associated wetlands, water features or hydrophytic plant or soil indicators were identified within 500 feet of the pad’s DA. FIGURE 4- SKR 698-10-BV Well Pad proximity to Deer Park Gulch (aka Tom Creek) 537 November 29, 2023 Page 6 of 15 2001 16th Street, Suite 900 Denver, Colorado 80202 The recent hydrology field investigation suggests that per Rule 1202.a.(3), long-term well and facility operations will place the maintenance tank in the northeast portion of the pad within 500 feet of Deer Park Gulch to the southeast and the agricultural ditch to the southwest. Chevron requested CPW Waiver approval to Rule 1202.a.(3) for this location in protection of these potential aquatic resources and received CPW approval on 11/16/23 (attached to this submittal). Chevron committed to institute the following BMPs to be protective of Deer Park Gulch and the agricultural ditch: o Stormwater management design protections during drilling and completion operations that include a perimeter collection channel around the entire pad circumference while routing stormwater flow to two dedicated detention ponds on the south and west sides of the pad. o Interim reclamation for long-term well production and facility operation will reduce the original location disturbed area (DA) from 6.16 acres to 2.35 acres, re-establishing approximately 3.81 acres of habitat to the area. o Post interim reclamation will maintain diversion channels on the south and west side of the reclaimed pad area to route surface flows to the permanent sediment pond(s). o Per post-interim reclamation, the facility pad area will include a permanent raised berm between the facility maintenance tank and Deer Park Gulch. o The facility maintenance tank (example picture below) will be constructed within an impervious, geosynthetic-lined under base, anchored into a metal-sided secondary containment system capable of containing up to 50% of the tanks capacity and any spill or leak from the storage vessel; o Permanent, post-interim reclamation stormwater controls will route flow from the facility area to perimeter collection channels and to stormwater sediment ponds located between the pad and downgradient aquatic features; 538 November 29, 2023 Page 7 of 15 2001 16th Street, Suite 900 Denver, Colorado 80202 o All surficial activities performed by Chevron during production operation activities will be protective of the environment. All vessels, totes, valves and flow lines associated with well production activities will be inspected daily for damage or leaks while in service; o Telemetric and automation technology will be utilized to monitor any variations in facility pressures and fluid gauges which could indicate a leak and provide remote shut-in capabilities of the facility in the event of any discharge or emergency; o A dedicated Spill-Response trailer with spill containment equipment will be staged full time at the SKR 698-10-BV well pad throughout well drilling activities and well completion operations. o The proposed activities will not utilize any pits. Fresh water will be temporarily stored in the Harpoon MLVT (Modular Large Volume Tank) structure on the SKR 22-1 pad to the south and will be covered to protect wildlife and treated for WNV larvae. The complete Aquatic Resource Inventory Report for the SKR 698-10-BV drill pad is attached to this Wildlife Mitigation Plan. Operating Requirements Pursuant to Rule 1202.a operating requirements, and the additional operating and mitigation requirements in Rules 1201.b.(1)-(4), 1202 and 1203, Chevron commits to the following Operational Requirements in protection of the OGDP SKR 698-10-BV drill pad environment. 1202.a. Operating Requirements • Black Bear Habitat 1202.a.(1)- The proposed SKR 698-10-BV drill pad is not within black bear habitat. • Water Transportation 1202.a.(2)- Chevron will follow appropriate protocols for disinfecting water collection and transportation equipment and thereby protecting any surface water sources utilized by Chevron operations. • Refueling/Chemical Storage Areas 1202.a.(3)- Deer Park Gulch is located approximately 150 feet south-southwest of the existing pad surface. As described above under Field Hydrologic Review, a Professional Wetland Scientist (PWS) provided full hydrologic review of surface waterway, wetlands, irrigation channel, and riparian areas potentially impacted by the SKR 698-10-BV drill pad and operations (full reporting is attached to this plan). Based on this detailed review, Chevron will be potentially situating new staging, refueling, or chemical storage areas within 500 feet of the Ordinary High-Water Mark (OHWM) of Deer Park Gulch. Chevron has requested a 1202.a.(3) Waiver from CPW and received approval on 11/16/23. • Wildlife Exclusions 1202.a.(4)- Chevron will implement appropriate wildlife exclusion devices for drilling, completion and production operations. Chevron will not construct or utilize drilling pits or production pits on location. Permanent medium or large volume secondary containment structures are not anticipated for the project. However, fresh water 539 November 29, 2023 Page 8 of 15 2001 16th Street, Suite 900 Denver, Colorado 80202 may be stored on location or at an adjacent pad in Minion Tanks during well drilling/completion activities. These tanks are completely netted to protect wildlife and are treated for WNV and larvae control. The following wildlife exclusion devices will be installed: o Fencing may be installed and maintained around the pad perimeter following drilling and completion activities and in coordination with surface landowner preferences. o Netting will be installed and maintained on all small-volume secondary containment structures that may hold precipitation and liquids. o Drip pans will have functional lids and be kept closed, when applicable. o Bird exclusion devices will be installed on the vent stacks for all separation and combustion devices, if applicable. o All produced water and water collection vessels will be close-topped, and all access ports will be sealed or netted. o Administrative Controls- daily inspections and good housekeeping practices will be followed for early prevention/detection of wildlife-related issues. • Trenching 1202.a.(5)- Any flowline/pipeline trenches left open for more than five consecutive days will have wildlife escape ramps at a minimum of one ramp per ¼ mile of trench. • Reclamation and Seed Mix 1202.a.(6)- While conducting interim and final reclamation activities (pursuant to 1000 Series Rules), Chevron will use an appropriate seed mix (mitigation seed mix for Elk habitat) when consistent with the Surface Owner’s approval and any Soil Conservation District requirements. • Fencing 1202.a.(7)- Chevron will use CPW-recommended fence designs when consistent with the Surface Owner’s approval and any relevant Local Government requirements. • Migratory Birds 1202.a.(8)- Chevron will conduct all vegetation removal necessary for Oil and Gas Operations outside of the established nesting season for migratory birds (April 1- July 31). For any vegetation removal activities performed between April 1 and July 31, Chevron will conduct pre-construction nesting surveys within the proposed disturbance area prior to vegetation removal. Should active nests be located, Chevron will establish appropriate work zone buffers. • West Nile Virus (WNV) and Mosquito Larvae Control 1202.a.(9)- Chevron will not utilize drilling or production pits. However, fresh water may be stored on location in Minion Tanks during well drilling/completion activities. These tanks are completely netted to protect wildlife and are treated for WNV and larvae control. • 1202.a.(10) Best Management Practices for activities in Proximity to Aquatic HPH 1202.c.(1).Q-S- Chevron is proposing activities within 500-1000 feet from 1202.c. Aquatic HPH areas for the SKR 698-10-BV drill pad development. The pad is already constructed and committed BMPs for proposed activities under this development are detailed in the Field Hydrologic Review section. 540 November 29, 2023 Page 9 of 15 2001 16th Street, Suite 900 Denver, Colorado 80202 1201.b.(1)-(4) Operating and Mitigation Requirements • (1) Pre-Application Consultation with CPW- Chevron has provided this document to CPW for pre-application consultation for the SKR 698-10-BV drill pad, per Rule 309.e.. CPW (Taylor Elm) was provided the document and its content on 11/7/23 and provided review comments (incorporated into this version) and final plan approval on (11/13/23). CPW review/approval documentation is attached to this submittal. • In addition to this Wildlife Mitigation Plan and pursuant to Rule 304.b.(2).B.viii, an Alternative Location Analysis (ALA) in the form of Chevron’s Wells Ranch Siting Rational for SKR 698-10-BV appraisal well drill pad has been provided with the application packet. Please reference the ALA document for specific locations and details. • (2) Best Management Practices- The following BMPs are committed under this Wildlife Mitigation Plan. o Chevron will pre-clear all proposed disturbances according to CPW guidance meeting Migratory Bird Treaty Act (MBTA), Bald and Golden Eagle Protection Act (BGEPA) and Endangered Species Act (ESA) laws in protection of active nesting activities, observe CPW/USFWS requested protected buffers for active nesting species, and consult with CPW/USFWS as warranted. o Chevron will install and maintain bird-deterrent devices on all open-vent exhaust stacks on production equipment to discourage perching, roosting and nesting activities. o Employ Chevron’s Stormwater Management Program to protect soil resources, minimize erosion, identify pollutants, apply pollutant control measures, and conduct regular inspections. o Although the project is using an existing pad, as necessary all interim and final reclamation areas will be contoured and re-vegetated to a stable condition to restore natural habitats for wildlife species. o Chevron will meet weed management targets during construction, drilling, production and reclamation lifecycles. o Chevron commits to employ Noise, Light, Dust and Odor mitigation efforts meeting ECMC Series 400 Rules in the protection of Wildlife Resources. A general summary of wildlife BMP commitments under the Series 400 aesthetic rules and incorporated by this WMP include:  Prior to the commencement of Drilling/Completion or Production Operations, Chevron will take all necessary and reasonable precautions to ensure that lighting, dust, noise and odor from the Oil and Gas Location does not unnecessarily impact the health, safety, and welfare of Wildlife occupying any High Priority Habitat within 2,000 feet of the Oil and Gas Location. For permanent facilities this includes: • Survey and document all active nests and dens potentially impacted by production operations. Documentation will be available for review. • Conduct a daily walkthrough of the location to ensure no wildlife have built nest(s) in/around lighting or noise sources. If nest(s) are found, HSE reporting will be issued to appropriate personnel to either remove the nest and/or temporarily abandon the lighting source until nest is abandoned.  Inform and educate all field employees and contractors on wildlife conservation practices, including no harassment or feeding of wildlife.  Utilization of telemetry equipment for remote monitoring to limit in-person visitation by production operations personnel. o Institute the Chevron safety program meeting Operational Excellence Management System initiatives and “Stop Work” authority. 541 November 29, 2023 Page 10 of 15 2001 16th Street, Suite 900 Denver, Colorado 80202 o Construction of pipeline infrastructure to provide takeaway of oil, natural gas, and fresh and produced water from the development, eliminating truck traffic and emissions associated with hauling product from the oil and gas development and limiting vehicle/wildlife interactions. o Any encroachment of wetlands or active water ways potentially considered Waters of the United States (WOTUS) will be reviewed and/or protected under USACE Nationwide or General Permit processes. 1202.b. Flowline Mitigation- Chevron will not encounter any aquatic HPH perennial streams that would require bore techniques for flowline/utility line installation. CPW has reviewed the applicability of Rule 1202.c.(2).C and concurred that flowline installation within the Aquatic Sportfish Management HPH buffer is appropriate (10/25/23 concurrence from CPW attached to this document and flowline BMP commitments are detailed under the SKR 698-10 BV Waiver Request, also attached). 1202.c. High Priority Habitat- No Surface Occupancy The SKR 698-10-BV drill pad development does potentially lie within 1202.c. HPH within or offset to its disturbance footprint. Chevron requested and received CPW waiver to Rule 1202.c.(1).S. for proposed activity within the No Surface Occupancy (NSO) within 500 feet of the OHWM of Deer Park Gulch designated as Sportfish Management Waters HPH. The waiver request approval is attached to this WMP. 1202.d. High Priority Habitat- Density Exceeding One Per Square Mile The development does lie within an area where Oil & Gas location densities exceed 1 per square mile. The proposed SKR 698-10-BV drill pad lies within Elk Severe Winter Range (SWR)/Winter Concentration Area (WCA) HPH. In addition to the above committed mitigation measures, Chevron will commit to the following mitigation efforts specific to Elk SWR/WCA as a 1202.d.(2) HPH. o Chevron plans to schedule all construction, drilling, and completion activities outside of Elk WCA protective timing stipulations (between April 16th and November 30th). If Chevron is unable to complete all operations between April 16th and November 30th, the operator will provide notice as soon as practical indicating that activities may be occurring within Elk SWR/WCA season (December 1st thru April 14th) through direct communication with CPW. Communication will include an estimated duration of the planned operations within the HPH. Should Elk be identified in the area during construction activities, Chevron will have a biologist on site periodically to monitor herd response and determine any potential negative impacts from development activities and discuss with CPW any mitigation efforts that could reduce these impacts. o Chevron will limit the placement of extensive linear barrier features (i.e. fencing, surface lines, berms) that may impact Elk movement and migration. o Fencing used will be 3 or 4 strand to a maximum height of 42-inches. 542 November 29, 2023 Page 11 of 15 2001 16th Street, Suite 900 Denver, Colorado 80202 o Chevron will quickly excavate, install, and reclaim linear pipeline features that may impact Elk movement and migration. 1203. Compensatory Mitigation for Wildlife Resources The SKR 698-10-BV drill pad is within Elk SWR/WCA HPH. 1203.b. Direct Impacts Mitigation Chevron anticipates that approximately 0.31 acres of long-term disturbance (following interim reclamation) will be established by the SKR 698-10-BV drill pad development: • SKR 698-10-BV drill pad – 0.21 acre initial disturbance for the construction of long-term stormwater detention basins, with an existing pad disturbance of 6.16 acres; 0.10 acre for additional access road construction (permanent disturbance); and a final post-interim reclamation pad disturbance of 2.35 acres. Also, the existing pad will be slightly expanded by 0.49 acres to allow inclusion of stormwater perimeter channels. Temporary flowline construction is estimated at approximately 9.48 acres (approximately 3.02 acres in Aquatic HPH and the entire length in Elk SWR/WCA HPH) of temporary disturbance. 1203.c. Direct Impact Mitigation Fee Calculation Chevron commits to the following compensatory mitigation for direct impacts to Elk SWR/WCA HPH, associated with development of the SKR 698-10-BV well drill pad. Direct Impact Mitigation Fees will be paid to CPW at least 30 days prior to submittal of Form 42 construction notification. Established Fee (since <10.99 acres) Proposed pad disturbance acreage (detention Basins and slight expansion to include perimeter channels) Access Road disturbance acreage Flowline disturbance acreage Total proposed acreage Total mitigation costs Temporary disturbance 0.49 0.00 9.48 9.97 Permanent disturbance 0.21 0.10 0 0.31 Total 0.70 0.10 9.48 10.28 $13,750.00 543 November 29, 2023 Page 12 of 15 2001 16th Street, Suite 900 Denver, Colorado 80202 1203.d. Indirect Impacts Mitigation The proposed SKR 698-10-BV well drill pad is an existing pad with an existing access road. The current use of this pad as an equipment storage area resulting in regular vehicle traffic and activity on the site. It is not anticipated that the new wells on the pad will result in significantly increased long-term indirect impacts. CPW has reviewed the need to off-set the unavoidable adverse indirect impacts and decided that they will not recommend compensatory mitigation for the reasons mentioned. If the winter seasonal timing limitation cannot be fully adhered to, Chevron will consult with CPW regarding potential mitigation to off-set the one-time indirect impacts occurring from development activities within the winter timing limitation period. If additional mitigation is necessary, Chevron will amend the Form 2A application via sundry to correct the compensatory mitigation amounts being provided. Respectfully submitted. Michael Keller- Lead Environmental Specialist (970-415-2631) 544 November 29, 2023 Page 13 of 15 2001 16th Street, Suite 900 Denver, Colorado 80202 Wildlife Mitigation Plan References and Sources State of Colorado Rulemaking in support of Sensitive and Protected Species/Habitat: Document references to ECMC Rules in support of this Wildlife Mitigation Plan include: • 300 Series Rules: o Rule 304: Form 2A: Oil and Gas Location Assessment Application o Rule 309: CPW Consultation • 400 Series Rules: o Dust, Light, Noise and Odor Mitigation • 500 Series Rules: o 529: Rulemaking Proceedings • 1200 Series Rules: Protection of Wildlife Resources Source: ECMC Regulation (state.co.us) Colorado Parks and Wildlife: Colorado Parks and Wildlife High Priority Habitat maps in support of ECMC Rule Making and supporting this Wildlife Mitigation Plan: Source: ECMC Maps (state.co.us) Colorado Parks and Wildlife, Department of Natural Resources- Recommended Buffer Zones and Seasonal Restrictions for Colorado Raptors (2020): Colorado Parks and Wildlife, Department of Natural Resources- Recommended Survey Protocol and Actions to Protect Nesting Burrowing Owls (revised 4/6/21): Source: Colorado Parks and Wildlife (state.co.us) U.S. Endangered Species Act (ESA): “Take” (as defined by ESA) of a federally-protected threatened and endangered species is illegal without permit. The project analysis must take into consideration threatened and endangered species as well as candidate and/or petitioned species. Species information may be obtained by contacting a local U.S. Fish and Wildlife field office with project information and/or accessed via the source below: Source: https://ecos.fws.gov/ipac/ Critical Habitat under ESA Critical habitat are specific areas deemed essential to the conservation of (ESA) endangered and threatened species and may need special management or protections. Projects must be evaluated for the presence of critical habitat. Source: https://www.fws.gov/southeast/endangered-species-act/critical-habitat/ 545 November 29, 2023 Page 14 of 15 2001 16th Street, Suite 900 Denver, Colorado 80202 Migratory Bird Treaty Act (MBTA): The MBTA prohibits intentional take of federally-protected birds without permit. Projects shall be evaluated for risk of take of MBTA-listed species, focusing on those species listed Birds of Conservation Concern (BCC) and Birds of Management Concern (BMC). This information may be obtained by contacting a local U.S. Fish and Wildlife field office with project information and/or may be accessed at the source below: Source: https://ecos.fws.gov/ipac/ Bald and Gold Eagle Protection Act (BGEPA): “Take” (as defined by BGEPA) of federally protected eagles is illegal without permit. Projects shall be evaluated for risk of take of bald and golden eagles. Species information may be obtained by contacting a local U.S. Fish and Wildlife office with project information and/or may be accessed at the source below: Source: https://ecos.fws.gov/ipac/ Clean Water Act (CWA): The CWA regulates the discharge of pollutants into the Waters of the United States and quality standards for surface waters. CWA makes it unlawful to intentionally or negligently discharge any pollutant from a point source into navigable waters, unless a permit is obtained. Waters of the United States (WOTUS): The Department of the Army, acting through the U.S. Army Corps of Engineers, has authority to permit the discharge of dredged or fill material in waters of the U.S. under Section 404 of the CWA, and permit work and the placement of structures in navigable waters of the U.S. under Sections 9 and 10 of the Rivers and Harbors Act of 1899. Projects resulting in impacts to WOTUS are subject to federal permitting requirements. Projects shall be evaluated for risk of impacts to jurisdictional Waters of the United States. In addition to the use of topographic maps, the following information is useful for WOTUS determinations: National Hydrography Dataset (NHD)/Watershed Boundary Dataset: Source: https://nhd.usgs.gov/NHD_High_Resolution.html USFWS National Wetland Inventory (NWI) Mapper: Source: https://www.fws.gov/wetlands/ NOTE: National Resource Conservation Service (NRCS) Soil and Topography Data (see section below) must be utilized to ascertain presence of hydric soils and flood risk. National Historic Preservation Act (NHPA)/Colorado Historical, Prehistorical and Archaeological Resources Act of 1973): Projects shall be evaluated for presence of cultural resources and historical artifacts. NOTE: Archaeological investigations must be performed or supervised by an archaeologist who meets the U.S. Secretary of the Interior’s Professional Qualification Standards for Archaeology (48FR 22716 or 36 CFR Part 61); or meets the requirements for Principal Investigator defined in 8 CCR 1405-7. 546 November 29, 2023 Page 15 of 15 2001 16th Street, Suite 900 Denver, Colorado 80202 Federal Emergency Management Administration (FEMA) Floodplain; Projects constructed in floodplains may require additional permitting. Projects shall be evaluated for potential impacts to floodplains and flood risk. Source: https://msc.fema.gov/portal NOTE: If floodplain maps are not available (i.e. “unmapped”), NRCS Soil and Topography Data must be used for planning purposes (See NRCS data below). 547 Atachments •Aqua�c Resources Inventory Report for the Proposed Development of the Skinner Ridge 10 Pad, Garfield County, Colorado •ECMC – CPW – Deer Park Gulch Spor�ish Management Waters High Priority Habitat Rule Waiver Request •CPW Approval Documenta�on for Deer Park Gulch Spor�ish Management Waters High Priority Habitat Rule Waiver Request 548 Aquatic Resources Inventory Report for the Proposed Development of the Skinner Ridge 10 Pad, Garfield County, Colorado JULY 2023 PREPARED FOR Chevron Rockies Business Unit PREPARED BY SWCA Environmental Consultants 549 550 AQUATIC RESOURCES INVENTORY REPORT FOR THE PROPOSED DEVELOPMENT OF THE SKINNER RIDGE 10 PAD, GARFIELD COUNTY, COLORADO Prepared for Chevron Rockies Business Unit 1625 Broadway Street, Suite 2200 Denver, Colorado 80202 Prepared by SWCA Environmental Consultants 295 Interlocken Boulevard, Suite 300 Broomfield, Colorado 80021 (303) 487-1183 www.swca.com July 2023 551 552 Aquatic Resources Inventory Report for the Proposed Development of the Skinner Ridge 10 Pad, Garfield County, Colorado i CONTENTS 1 Introduction .......................................................................................................................................... 1 2 Methods ................................................................................................................................................. 1 2.1 Desktop Review ............................................................................................................................ 1 2.2 Field Survey .................................................................................................................................. 1 2.2.1 Mapping .............................................................................................................................. 1 2.2.2 Wetlands ............................................................................................................................. 2 2.2.3 Non-wetland Waters ........................................................................................................... 2 3 Results.................................................................................................................................................... 2 3.1 General Observations and Desktop Review ................................................................................. 3 3.2 Field Survey .................................................................................................................................. 3 3.2.1 Wetlands ............................................................................................................................. 4 3.2.2 Non-wetland Waters ........................................................................................................... 4 4 Summary and Recommendations ....................................................................................................... 4 5 Literature Cited .................................................................................................................................... 6 Appendices Appendix A. Aquatic Resources Inventory Maps Appendix B. Photographs of the Survey Area Appendix C. Natural Resources Conservation Service Soil Report for the Survey Area Tables Table 1. Monthly Recorded Precipitation at the Grand Junction, Colorado, Weather Station ..................... 3 Table 2. Waterbodies Identified within the Survey Area .............................................................................. 4 553 Aquatic Resources Inventory Report for the Proposed Development of the Skinner Ridge 10 Pad, Garfield County, Colorado ii This page intentionally left blank. 554 Aquatic Resources Inventory Report for the Proposed Development of the Skinner Ridge 10 Pad, Garfield County, Colorado 1 1 INTRODUCTION On behalf of Chevron Rockies Business Unit (Chevron), SWCA Environmental Consultants (SWCA) completed an aquatic resources inventory, commonly referred to as a wetland delineation, for the proposed development of the Skinner Ridge 10 Pad in Garfield County, Colorado (Figure A-1 in Appendix A). SWCA evaluated and delineated wetlands and other aquatic resources that are within 500 feet of the proposed pad area (survey area). The approximate center point of the proposed development is at latitude 39.540314°, longitude -108.321892 ° (see Figure A-1). The goal of this aquatic resources inventory is to identify aquatic resources containing an ordinary high-water mark (OHWM) or wetland within 500 feet of the proposed development in order to comply with the Energy & Carbon Management Commission’s (ECMC’s; formerly Colorado Oil and Gas Conservation Commission) Rule 1202(3). The aquatic resources inventory included the identification and recording of features that may be determined to be waters of the United States (WOTUS) by the U.S. Army Corps of Engineers (USACE). WOTUS include waterbodies, such as rivers, creeks, streams, arroyos, lakes, and associated wetlands that have connectivity to downstream navigable waters or tidal seas. Under the Clean Water Act, wetlands are aquatic resources that are inundated or saturated by surface water or groundwater at a frequency and duration sufficient to support, and under normal circumstances do support, a prevalence of vegetation typically adapted for life in saturated soil conditions (USACE 1987). Non-wetland waters are generally identified and delineated by the presence of an OHWM, which is a defined boundary on the shore or bank of an aquatic resource established by water fluctuations and movement. 2 METHODS The aquatic resources inventory included a desktop review of existing data and a field survey. The following sections provide a summary of the methods used to collect data and generate aquatic resource mapping. 2.1 Desktop Review SWCA conducted a desktop review of existing spatial data prior to the field survey to identify areas with the greatest potential for aquatic resources. Sources used during the desktop review included U.S. Geological Survey (USGS) 7.5-minute quadrangles, U.S. Fish and Wildlife Service (USFWS) National Wetlands Inventory (NWI) maps (USFWS 2023), the National Hydrography Dataset (NHD) (USGS 2023), the USGS StreamStats tool (Version 4.14.0) (USGS 2020), Natural Resources Conservation Service (NRCS) soil survey maps (NRCS 2023a), and historic and current aerial photographs of the survey area (Google Earth 2023; NETROnline 2023). 2.2 Field Survey SWCA conducted the aquatic resources field survey on July 21, 2023. SWCA biologists performed formal wetland and waterbody delineations within 500 feet of the proposed oil and gas location on accessible parcels crossed by the proposed development. The following sections provide a summary of the methods used during the field survey to collect data and generate aquatic resource mapping. 2.2.1 Mapping A handheld global positioning system (GPS) receiver with sub-meter accuracy was used to record delineated wetland and waterbody boundaries and geographically reference data points during the field 555 Aquatic Resources Inventory Report for the Proposed Development of the Skinner Ridge 10 Pad, Garfield County, Colorado 2 survey. Geographic information system (GIS) software was used to analyze recorded features, calculate areas, and generate the survey area maps. When potential wetland or non-wetland waters within the survey area were located on adjacent land for which Chevron did not have access permission or extended outside of accessible parcels, SWCA visually confirmed these resources from available access points and digitized boundaries using the best available aerial imagery. 2.2.2 Wetlands The presence/absence of wetlands was determined in the field using delineation methods provided in the Corps of Engineers Wetlands Delineation Manual (Manual) (USACE 1987) and the Regional Supplement to the Corps of Engineers Wetlands Delineation Manual: Great Plains Region (Version 2.0) (Regional Supplement) (USACE 2010). Data at each potential wetland were recorded on the Regional Supplement wetland determination data forms. Determination of wetland habitat (type) is based on the classification system developed by Cowardin et al. (1979). Per the Manual and Regional Supplement, wetlands are present in areas where three wetland parameters (i.e., wetland hydrology, hydric soils, and hydrophytic vegetation community) are present under normal circumstances. The presence of these wetland parameters is determined using the indicators provided in the Regional Supplement. One data point is recorded within each potential wetland (or wetland type for proximate, similar wetlands) along with a corresponding upland data point. These data provided the basis for mapped wetland-upland boundaries. 2.2.3 Non-wetland Waters The presence and extent of non-wetland waters (e.g., constructed ditches and reservoirs, active channels, and ponds) was determined in the field using the guidance and methods provided in the USACE Regulatory Guidance Letter No. 05-05 (USACE 2005) and the USACE’s A Field Guide to the Identification of the Ordinary High Water Mark (OHWM) in the Arid West Region of the Western United States (USACE 2008) (Technical Guidance). An OHWM is the line on a shore established by fluctuations of water and is typically identified by physical characteristics, such as a clear, natural line impressed on the bank; shelving; changes in the character of soil; destruction of terrestrial vegetation; the presence of litter and debris; or other appropriate means that consider the characteristics of the surrounding areas. The spatial extent of non-wetland waters is delineated using the identified OHWM for each feature. Non-wetland waters were characterized hydrologically as ephemeral, intermittent, or perennial waters. Ephemeral features flow only in direct response to precipitation or snowfall and flow for a brief period of time. Intermittent waters have prolonged flow that is sustained (at least in part) by melting snowpack or a groundwater source. Perennial waters flow continuously but may have periods of less flow. According to the USACE Manual and Technical Guidance (USACE 1987, 2008), erosional features that lack an OHWM or a continuous OHWM are not WOTUS. 3 RESULTS The results of the desktop review and field survey for the Skinner Ridge 10 pad are presented in the following sections. Maps of the survey area are provided in Appendix A, representative photographs of the survey area are provided in Appendix B, and the NRCS soil report for the survey area is provided in Appendix C. 556 Aquatic Resources Inventory Report for the Proposed Development of the Skinner Ridge 10 Pad, Garfield County, Colorado 3 3.1 General Observations and Desktop Review The Skinner Ridge 10 pad survey area is in the Colorado Headwaters-Plateau (14010005), roughly 5,840 feet above sea level (see Figure A-1). The survey area terrain is flat, generally sloping to the southwest, and primarily consists of oil and gas development (Figures B-1–4). Based on data provided by the USGS StreamStats tool, the survey area is in an approximately 99.5-square-mile drainage basin that receives approximately 20.6 inches of mean annual precipitation (USGS 2020). The survey area is not located within a 100-year floodplain. The closest 100-year floodplain is associated with Roan Creek, approximately 12.6 miles southeast of the pad boundary (ECMC 2023; Federal Emergency Management Agency 2023). Geologic mapping for this area indicates that the survey area is in the lower part shale, sandstone, marlstone, and limestone known as the Green River Formation (Tweto 1979). According to the NRCS soil surveys for Garfield County, Colorado, none of the soil map units within the survey area have the potential to fulfill the hydric soil criteria (NRCS 2023b). The dominant soil map units present within the survey area are Cumulic Haploborolls, 1 to 3 percent slopes, Happle very channery sandy loam, 3 to 12 percent slopes, Happle-Rock outcrop association, 25 to 65 percent slopes, and Tosca channery loam, 25 to 80 percent slopes MLRA 48A; all of these are described as well drained and have recorded depths to groundwater greater than 80 inches (NRCS 2023a) (see Appendix D). The latest NHD and NWI maps indicate that there is one potentially jurisdictional stream feature within the survey area of the proposed Skinner Ridge 10 pad (USFWS 2023). The mapped stream feature is southeast of the proposed development, with the closest segment of the stream approximately 150 feet southeast of the proposed pad. No aquatic resources were mapped or identified within the disturbance boundary of the proposed pad. Based on SWCA’s review of available data and observations made at the time of the survey, hydrologic conditions in the vicinity of the survey area are generally representative of typical conditions for this time of year. The recorded rainfall amounts for May to July 2023 are compared with normal rainfall amounts for these months in Table 1. According to data obtained from Weather Underground (2023), in the 3- month period preceding SWCA’s site visit, the survey area received less-than-normal rainfall, with less- than-normal precipitation in all 3 months assessed. Table 1. Monthly Recorded Precipitation at the Grand Junction, Colorado, Weather Station Month Recorded Rainfall (inches) Normal Rainfall (inches) Difference (inches) May 2023 0.04 0.88 0.84 June 2023 0.23 0.46 0.23 July 2023 0.04 0.61 0.57 Total 0.31 1.95 1.64 Sources: U.S. Climate Data (2023); Weather Underground (2023). 3.2 Field Survey Qualified SWCA biologists conducted the on-site field survey on July 21, 2023. SWCA biologists performed formal wetland and waterbody delineations within 500 feet of the proposed oil and gas location on accessible parcels crossed by the proposed development; visual wetland assessments followed 557 Aquatic Resources Inventory Report for the Proposed Development of the Skinner Ridge 10 Pad, Garfield County, Colorado 4 by desktop delineations are conducted on parcels not crossed by a project for which Chevron does not have permission for pedestrian access. 3.2.1 Wetlands SWCA identified no wetlands within the Skinner Ridge 10 pad survey area, and no further action is required. 3.2.2 Non-wetland Waters SWCA identified and delineated approximately 0.24 acre of a non-wetland waterbodies within the survey area (Table 2, Figure A-2). Table 2 lists the size of each delineated waterbody feature within the survey area and the distance from each feature to the proposed Skinner Ridge 10 pad. Table 2. Waterbodies Identified within the Survey Area Waterbody ID Size within the Survey Area (acres) Distance to Pad (feet) Direction to Pad WB01 0.187 383.68 Northeast WB02 0.050 150.51 Northwest 3.2.2.1 AGRICULTURAL DITCH (WB01) SWCA delineated approximately 0.19 acre of an agricultural ditch containing an OHWM. The ditch is an intermittent drainage feature that flows generally north to south and crosses the western portion of the survey area, continuing south and draining into WB02 (Figures B-5 and B-6 in Appendix B; see Figures A-2). The ditch receives waters primarily from upstream reservoirs and aquifers. The waterbody is located slightly downgradient of the proposed Skinner Ridge 10 pad, with the closest segment of the ditch approximately 384 feet southwest of the proposed development. 3.2.2.2 INTERMITTENT STREAM (WB02) SWCA delineated approximately 0.05 acre of unnamed stream feature containing an OHWM. The stream is an intermittent drainage feature that is a tributary to Clear Creek (Figures B-7 and B-8; see Figure A-2). The stream receives waters primarily from runoff from the snowpack melt. The waterbody is located slightly downgradient of the proposed Skinner Ridge 10 pad, with the closest segment of the stream feature approximately 150 feet southeast of the disturbance boundary of the proposed Skinner Ridge 10 pad. 4 SUMMARY AND RECOMMENDATIONS Two waterbodies, totaling 0.237 acre, were recorded within the proposed Skinner Ridge 10 pad survey area. Based on NWI and NHD maps, field surveys, and proximity of the proposed development to the nearest aquatic resources, disturbance from construction is not anticipated to impact potentially jurisdictional aquatic resources; therefore, proposed production facility construction is not expected to trigger permitting under Section 404 of the Clean Water Act (U.S. Environmental Protection Agency 2008). ECMC permitting is still expected to include consultation regarding Rule 1202(3) because the proposed Skinner Ridge 10 pad will likely include chemical storage facilities within 500 feet of an aquatic resource. 558 Aquatic Resources Inventory Report for the Proposed Development of the Skinner Ridge 10 Pad, Garfield County, Colorado 5 It is assumed that a variance application will be required. The current process requires operators to submit a variance request through a formal hearings application. Variance applications must demonstrate the following under Rule 502.c: 1) that the operator has made a good faith effort or is unable to comply with the rule; 2) that the requested variance will not violate the basic intent of the Act; 3) that the requested variance is necessary to avoid an undue hardship; 4) that granting the variance will result in no adverse impact to public health, safety, welfare, the environment, or wildlife resources; and 5) that the requested variance contains reasonable mitigation measures to avoid, minimize, or mitigate adverse impacts to public health, safety, welfare, the environment, and wildlife resources. Based on SWCA’s experience, reasonable mitigation measures include an engineering design incorporating protective berms and stormwater management to avoid and minimize risk of potential impacts. 559 Aquatic Resources Inventory Report for the Proposed Development of the Skinner Ridge 10 Pad, Garfield County, Colorado 6 5 LITERATURE CITED Cowardin, L.M., V. Carter, F.C. Golet, and E.T. LaRoe. 1979. Classification of Wetlands and Deepwater Habitats of the United States. FWS/OBS-79/31. Washington, D.C.: U.S. Fish and Wildlife Service. Energy & Carbon Management Commission (ECMC). 2023. ECMC Interactive Map. Available at: https://ecmc.state.co.us/maps.html#/gisonline. Accessed July 2023. Federal Emergency Management Agency. 2023. FEMA Flood Map Service Center. Available at: https://msc.fema.gov/portal/home. Accessed July 2023. Google Earth. 2023. Available at: https://www.google.com/earth/. Accessed July 2023. Natural Resources Conservation Service (NRCS). 2023a. Soil Survey of Garfield County Northern Part, Colorado. Available at: http://websoilsurvey.sc.egov.usda.gov/App/WebSoilSurvey.aspx. Accessed July 2023. ———. 2023b. Natural Resources Conservation Service, National Lists of Hydric Soils (December 2015). Available at: http://www.nrcs.usda.gov/wps/portal/nrcs/main/soils/use/hydric/. Accessed July 2023. NETROnline. 2023. Historic Aerials. Historic Aerial Image Database Viewer. Available at: https://www.historicaerials.com/viewer. Accessed July 2023. Tweto, O. 1979. Geologic Map of Colorado: U.S. Geological Survey Special Geologic Map, scale 1:500,000. Available at: https://ngmdb.usgs.gov/Prodesc/proddesc_68589.htm. Accessed July 2023. U.S. Army Corps of Engineers (USACE). 1987. Corps of Engineers Wetlands Delineation Manual. Technical Report Y-87-1. Vicksburg, Mississippi: U.S. Army Engineers Waterways Experiment Station. ———. 2005. Regulatory Guidance Letter No. 05-05, Subject: Ordinary High Water Mark Identification. Signed by Major General Don T. Riley, Director of Civil Works. ———. 2008. A Field Guide to the Identification of the Ordinary High Water Mark (OHWM) in the Arid West Region of the Western United States, edited by R.W. Lichvar and S.M. McColley. ERDC/CRREL TR-08-12. Hanover, New Hampshire: U.S. Army Engineer Research and Development Center. ———. 2010. Regional Supplement to the Corps of Engineers Wetlands Delineation Manual: Great Plains Region (Version 2.0), edited by J.S. Wakeley, R.W. Lichvar, and C.V. Noble. ERDC/EL TR-08-12. Vicksburg, Mississippi: U.S. Army Engineer Research and Development Center. U.S. Climate Data. 2023. Climate Grand Junction – Colorado. Available at: https://www.usclimatedata.com/climate/grand-junction/colorado/united-states/usco0166. Accessed July 2023. U.S. Environmental Protection Agency. 2008. 2008 Rapanos Guidance and Related Documents under CWA Section 404. Available at: https://www.epa.gov/cwa-404/2008-rapanos-guidance-and- related-documents-under-cwa-section-404. Accessed July 2023. 560 Aquatic Resources Inventory Report for the Proposed Development of the Skinner Ridge 10 Pad, Garfield County, Colorado 7 U.S. Fish and Wildlife Service (USFWS). 2023. National Wetlands Inventory. U.S. Fish and Wildlife Service Ecological Services. Available at: http://www.fws.gov/wetlands/Data/State- Downloads.html. Accessed July 2023. U.S. Geological Survey (USGS). 2020. StreamStats Web Tool. Available at: https://streamstats.usgs.gov/ss/. Accessed July 2023. ———. 2023. National Hydrography Dataset. Available at: http://nhd.usgs.gov/index.html. Accessed July 2023. Weather Underground. 2023. Forecast for Grand Junction, CO. Available at: https://www.wunderground.com/history/monthly/us/co/grand-junction/KGJT/date/2023-7. Accessed July 2023. 561 Aquatic Resources Inventory Report for the Proposed Development of the Skinner Ridge 10 Pad, Garfield County, Colorado 8 This page intentionally left blank. 562 APPENDIX A Aquatic Resources Inventory Maps 563