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HomeMy WebLinkAbout1.00 General Application Materials_Part11Upstream Pre-Startup Safety Review Standard Asset Integrity & Process Control Yes No N/A Name/Date: material verification, vendor’s recommendations and meets operational performance standards? Are current planned operating conditions within equipment operating limits (i.e., temperature, pressure, flow, concentration)? Have the following Asset Integrity Management items been considered/completed for integrity critical equipment? Equipment Criticality Assessment? Reliability Centered Maintenance? Safety Integrity Level Assessment? Risk Based Inspection? Preventative Maintenance Program? Have critical controls and shutdowns been function tested? (e.g., alarm and interlock tests) Have alarm and emergency shutdown devices (ESD) been checked for fail safe operation and trip points verified? Have all control valve bypasses (where installed) been verified in their correct positions for start-up? Have critical control valves/instruments been fireproofed? Are there any known discrepancies as defined by Asset Integrity standards? Has the computer control graphics been updated to reflect changes in controls? Confirm Asset Integrity & Process Control Checks Complete (Name/Sign/Date) HES Occupational Health Yes No N/A Name/Date: Have H2S, fire, oxygen, and hydrocarbon monitors/detectors been calibrated and tested? Have all high noise areas requiring special hearing protection properly marked with the appropriate warning signs? Are HAZCOM signs installed for all chemicals, products and materials handled, stored or processed at the facility? Emergency Management Yes No N/A Name/Date: Are all muster points, emergency escape routes, and access and egress appropriate / adequate? 353 Upstream Pre-Startup Safety Review Standard HES Is emergency lighting provided? Have the emergency alarms/alerting systems been checked to ensure they are operational? Have pre-incident plans been developed for major incident scenarios? Have emergency drills been conducted to ensure all personnel know the proper escape routes, muster points, and relevant actions? Have fire and gas detection systems been calibrated and tested? Have sprinkler, deluge systems, or other fire protection systems been tested? Are fire protection facilities (e.g., fire extinguishers, fire walls, sprinkler systems, alarm boxes etc.) installed as per design? Environmental Yes No N/A Name/Date: Have adequate provisions been made to avoid venting or draining of flammable materials to the environment? Have adequate arrangements been made, prior to start-up for the identification, classification, and safe disposal of all waste materials? Are dykes, drainage system and curbing adequate? Are all the applicable Construction, Environmental and Operating Permits up-to- date and approved? HES Rep: Confirm HES Checks Complete (Name(s)/Signature(s)/Date) PSSR Deviations This section lists items that were checked “No” and will be managed by the PSSR Deviation Management Process. Deviation Signature Position / Title Date Deviation Signature Position / Title Date Deviation Signature Position / Title Date 354 Page 42 of 48 Appendix B: Linkages to Related Processes and Documents Pre-Startup Safety Reviews link to several existing standards within Chevron. It is relevant to note the key standards and processes to ensure that criteria detailed in those are being met with respect to PSSRs. Linkage to Operational Excellence Chevron’s standard approach for conducting its business is guided by OEMS. PSSRs fulfill OE Expectation 2.4 that requires a PSSR prior to start up. Additionally, PSSRs support components of several of the OE Elements, but most notably links to Element 3: Safe Operations and Element 4: Management of Change. Linkage to Process Safety Chevron has defined fourteen elements of process safety that are mapped to the OEMS and align with OSHA process safety management regulations. PSSR is linked to all the process safety elements as the main purpose of a PSSR is to verify that all process safety systems are in place and ready for startup. Though the performance of PSSRs supports all the process safety elements, it most directly relates to the following elements: Process Safety Elements Directly Supported by PSSRs Process Safety Element How PSSR Supports Element Operations Readiness and Pre-Startup Procedures Fulfills need for a pre-startup safety review. Asset Integrity Questions future inspection, testing, and preventative maintenance tasks. Process Safety Information Verification that process safety information is accurate and in place prior to start up. Management of Change PSSRs are required by the Upstream MOC Facilities & Operations Guidance prior to start up after a change has been made. Figure 8: PSSRs Linkage to OE 355 Upstream Pre-Startup Safety Review Standard Operating Procedures PSSRs are required by the Upstream Guidance for Operating Procedures prior to start up after a change has been made. Verification that operating procedures are accurate and in place prior to start up. Technical Codes & Standards Verification that design intent has been met prior to start up. Linkage to Project Operations Planning (POP) Project Operations Planning (POP) is the framework to ensure that projects have effectively incorporated operability, maintainability, and reliability requirements in their project scope. PSSRs are deliverables that are referenced in POP. Terminology Relevant to POP and PSSRs Term Relevant to POP: Pre-Startup Safety Review (PSSR) Focuses on evaluating a system / equipment prior to start up to assess whether it is safe to start up and continue operations. Included as an operations deliverable on the Milestones and Deliverables Map (MDM) Operations Readiness Review (ORR) ORRs are part of PRC’s Project Assurance effort and are undertaken on MCPs at pre-determined intervals in CPDEP Phase 4 to demonstrate and to determine the status of the following: Project Readiness to complete and turnover an asset that is ready to operate in conformance with Chevron’s OEMS and BU expectations. Business Unit Readiness to receive and operate the Asset in conformance with Chevron’s OEMS requirements. PSSRs occur after ORRs. Information / open actions from an ORR should flow into the PSSR. Linkage to Upstream Guidance for Operating Procedures PSSRs are called for in the Upstream Guidance for Operating Procedures. Specifically: “A Pre-Startup Safety Review must be performed for new or modified facilities if required as part of the Management of Change process – and in this case the Pre-Startup Safety Review is conducted in place of an Operational Readiness Review.” To clarify further, PSSRs are a management system and tactical check to ensure a system is safe for startup and continued operations, while the ORR is a tactical, detailed check immediately prior to start up to verify operational readiness to start up. (As a note, the Operational Readiness Review referred to here is different from the ORR – Operations Readiness Review – that is a Phase 4 MCP Assurance.) Linkage to Upstream Management of Change (MOC) for Facilities & Operations (F&O) Guidance 356 Upstream Pre-Startup Safety Review Standard The Upstream MOC for F&O Guidance states that a “Fit-for-purpose PSSR that includes appropriate equipment and facility readiness checks were performed prior to approval to start-up” is required. Specifically, “Within the Upstream MOC process, a Pre-Start-up Safety Review (PSSR) is a final check prior to initiating the use of process equipment to verify that all related process safety requirements have been met and that the condition and readiness of the physical equipment and facilities are safe to start up. This PSSR shall cover the review of all modified equipment in the scope of the MOC and other related equipment that has been shut down during construction and installation of the change.” All MOCs require the performance of a PSSR. Conversely, all PSSRs are not triggered by MOCs. Linkage to Systems Completion The systems completion team within an MCP supports the planning of the PSSR due to their role of systemization of the facility. During CPDEP Phases 3 and 4, the team responsible for leading the PSSR will work to develop a strategy and plans around PSSR execution. The PSSR is owned by operations and supported by the project. Any discipline may take the lead of planning the PSSRs, but typically this is led by the Start-Up Team or Pre-Operations Team on an MCP. The project PSSR lead should also participate in systems completion work and be in essence a “systems completion champion” to ensure integration with the PSSR planning. If a robust systems completion method exists that is overseen by the owner’s team (Chevron) or closely signed off and witnessed by the owner’s team, the systems completion work may be utilized as appropriate in the PSSR. A full re- verification of their work is not needed. However, the extent of use of the systems completion checks in a PSSR should be at the discretion of operations and the PSSR lead. Considerations on the extent of use of systems completion work includes: Timing of the previously done systems completion checks (How much time has passed and how much travel / transportation has the system undergone between mechanical completion / testing / commissioning and startup?) Systems completion process execution. A robust systems completion method should include a database and the proper organizational capability. Extent of Chevron involvement in systems completion. Continuity of personnel between systems completion and PSSR teams. Spot checks planned in PSSR. PSSR Activities as Related to Systems Completion Phase Activity: CPDEP Phase 3 Systemization of asset. Develop strategy on systems or subsystems on which PSSRs will be completed. Develop strategy around timing of system commissioning and startup. Typically, a fishbone diagram may be used. CPDEP Phase 4 Finalize systemization during detailed engineering. Develop detailed plan on which sub-systems / systems / areas PSSRs are to be performed along with associated timing. Provide PSSR work packs for each system with a PSSR. Systems Completion Documents to Leverage in PSSR 357 Upstream Pre-Startup Safety Review Standard In addition to supporting planning for the PSSRs, systems completion inputs may be used to verify components of the PSSR. These are detailed in the two documents listed below and summarized in the chart. Phase Activity: Check sheet and Certificate Requirements Specification MCP- 7214-SC-SPC-PRC-0000-00820-00 Refer to the above document for a detailed list of documents associated with each category to the right. Inspection Release Notes “A” Check sheets (A: Mechanical completion) “B” Check sheets (B: Equipment is energized, and function tested) Mechanical Completion Certificates Ready For Commissioning Certificates “C” Check sheets (C: System is commissioned) Associated A, B, C Punchlists (closeout verification) Functional Test Procedures Pre-Start-Up Procedures Ready For Start-Up Certificates Systems Acceptance Certificates Database Functional Requirements Specification MCP-7214-SC-SPC-PRC-0000-00821-00 To the right are the types of reports that are run from the systems completion database. Refer to the document above for further details on database requirements and specific report types. Systems Completion Database: Software application that provides Project Management Team and Contractors with the means to organize and manage progress of all Systems Completion activities. Standard reports: Reports that are required on every project. Custom reports: Queries, filters, or temporary variation of a standard report. 358 Upstream Pre-Startup Safety Review Standard Appendix C: Interface with Mechanical Completion, Commissioning, and Startup Below is a flowchart outlining the interface with mechanical completion, commissioning, and startup. 359 Upstream Pre-Startup Safety Review Standard Appendix D: Systems Completion Certification Process The PSSR is the culmination of the systems completion process and is the certification that the system is mechanically complete. Though there are additional components to the PSSR that are not in the scope of systems completion (such as training and operating procedures), all mechanical completion items checked in the PSSR are supported by systems completion. Ultimately, systems completion work is validated by operating organization’s PSSR in Phase 5 Appendix E: PSSR Standard Requirements Throughout the document several requirements or “shall” statements are outlined that apply to any PSSR performed. Those basic requirements are outlined below. Defining when a PSSR is to be performed is a required component of a PSSR program and shall be clearly documented. Below are the minimum instances when a PSSR shall be performed. All changes that are in the scope of the Upstream MOC for Facilities and Operations Process. Changes in process safety information (PSI), including greenfield installations or modifications to an existing (brownfield) facility. (See the Upstream Facility Information Management Standard Process, FEF-STD-CUG-0002-Z01, for a full catalogue of PSI.) A significant replacement in kind (complex in scope or affecting multiple systems) has been made to an existing system / facility, such as a unit turnaround. After an intrusive inspection effort or major repair. For example, disassembly and inspection of an entire train or system within a train of equipment. 360 Upstream Pre-Startup Safety Review Standard A temporary change has been made. Perform a PSSR to start-up the process with the temporary change and again when the system is reconfigured to its permanent condition. A “mothballed” or idled process (one that has been out of service for a length of time) is restarting. For large MCPs, a PSSR is required for new systems being put into operation for the first time where there is risk for impact to safety upon startup. A system walkthrough shall occur. A PSSR shall be performed prior to a system operating in accordance with its “intended use”. PSSRs shall follow OEMS principles and must conform to local regulations. The PSSR Procedure and completed PSSRs shall be stored in a system of record. The PSSR Team shall comprise of a PSSR Team Leader and a Final Approver; these shall not be the same person. Additionally, there must be representation from operations on the PSSR Team as well as a person with competency to answer technical questions. All PSSR Team Members shall sign off on the PSSR. PSSR Programs shall have a method to manage items that are checked as “No”. 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 Waste Management Plan Date: 11/10/2023 Location: OGDP SKR 698-10-BV / SKR 698-10-BV Pad Legal Description: Tract 72, SWSW of Section 10 & NWNW of Section 15, Township 6 South, Range 98 West, 6th P.M., Garfield County, Colorado 382 Location Information This document provides site-specific information for the SKR 698-10-BV (Skinner Ridge) Pad (referred to as the “Pad”) located within OGDP SKR 698-10-BV. A pre-application meeting with Garfield County, CDPHE, ECMC, CPW, and Chevron was held on October 12, 2023. This application will be an amendment to the existing SKR-66S98W/10 SWSW Pad, permitted with ECMC under location ID #336056. This Pad was initially permitted for the drilling and completion of 22 wells; however, those wells were never drilled. Instead, the location was utilized as the Skinner Ridge Storage Facility, permitted by both ECMC, under location ID #447846, and Garfield County, under permit LIPA 6428. The information in this document relates specifically to the time during the construction, drilling, completion, and production of the two (2) proposed horizontal wells on the well pad portion of the location and the construction and operation of the facility portion of the location, which will receive production from the two wells. Additionally, a pilot hole for geothermal testing will be drilled in one of the wells, but the pilot hole will be plugged prior to drilling the horizontal leg of the well. The existing location is located off Garfield County Road 211 (Clear Creek Road) approximately 16.7 miles northwest of De Beque, Colorado. The Pad lies on Tract 72, and is situated on two sections, the SWSW of Section 10 and the NWNW of Section 15, Township 6 South, Range 98 West, 6th P.M. zoned Resource Lands per Garfield County. The existing Skinner Ridge Storage Facility disturbance area is 6.2 acres, and an additional 0.7 acres of disturbance is proposed for construction of stormwater detention ponds and drainage channels at the SKR 698-10-BV Pad. The working pad surface (WPS) will be 3.8 acres. The Pad disturbance area will be reduced to 2.3 acres during interim reclamation. The Pad is located on Garfield County Parcel 213732100008 owned by Chevron U.S.A., Inc. The location is currently used as a storage yard and all storage equipment and facilities will be relocated prior to drilling the proposed wells. The wells on the SKR 698-10-BV Pad will produce to the proposed production facility portion of the location and be tied into Chevron’s existing Central Production Facility (CPF) via a proposed gas and liquids line. Proposed equipment on the Pad will include separators, pigging stations, a gas meter, pipe skid, an instrument air skid, a skid drain vault, a chemical injection skid, a communication tower, solar skids, a maintenance tank, heat trace equipment, a transformer or electric generators, switchracks, and a battery box. A temporary MLVT, located on the nearby Skinner Ridge-66S98W/22NENW Pad (Location ID# 324358), will be utilized for completion operations. Phase Duration (days) Estimated Start Date Construction (Daylight Only) 10 days 2nd Quarter 2024 Drilling 80 days 3rd Quarter 2024 Completion 23 days 3rd Quarter 2025 Flowback N/A Flowing back directly to permanent facility Production 30 years 3rd Quarter 2025 Interim Reclamation (Daylight Only) 60 days 2nd Quarter 2026 383 Potentially Impacted Parties The Working Pad Surface (WPS) of the SKR 698-10-BV Pad is within 2,000 feet of zero (0) Residential Building Units (RBUs), zero (0) High Occupancy Building Units (HOBUs), and zero (0) Designated Outside Activity Areas (DOAAs). The Pad is located within a Disproportionately Impacted Community (DIC). The location is within ECMC designated High Priority Habitat (HPH) per rule 1202.d for Elk Winter Concentration Area and Elk Severe Winter Range and rule 1202.c for Aquatic Sportfish Management Waters. Background and Regulations In compliance with ECMC Rules 905 and 1000 Series Reclamation Regulations, and the Drill Cuttings Management Policy (9/15/14), Chevron U.S.A., Inc. (Chevron) submits the following general plan for handling and disposing of E&P waste, including drilling mud and cuttings. The wastes described in this plan are characterized as solid wastes, per ECMC definitions. All wastes, except for general trash and sewage, are specifically exempt from the Resource Conservation Recovery Act (RCRA) Subtitle C hazardous waste regulations. 40 CFR 261.4(b)95) states the following wastes are not hazardous wastes: drilling fluids, produced waters, and other wastes associated with the exploration, development, or production of crude oil, natural gas or geothermal energy. Wastes stored onsite will be stored in compatible containers and inspected to ensure they are in good condition and free of excessive wear, structural issues or other defects that may impact their effectiveness. Chevron utilizes only licensed third-party transporters for all waste transport and coordinates with Relevant Local Governments on haul routes for transport of waste. Records are maintained as required for all waste management-related activities. These include invoices, manifests, bills of lading and disposal logs. Disposal records include the date of transport, identity of the transporter, location of the waste pickup, type and volume of waste, and the name and location of the disposal site. Records, either electronic or hard copy, are retained, for not less than five years. Requirements 1. The Waste Management Plan will be organized into sections to discuss management of each waste stream, and by operational phases, as applicable to the location: a. Construction; b. Drilling; c. Completions; d. Flowback; e. Production; f. Spill response and remediation; g. Facility decommissioning; and 384 h. Plugging and abandonment. 2. For each operational phase listed above, Operators will: a. Provide a descriptive list of all waste streams anticipated to be generated at the location. For each waste stream identified, include: i. The name or type of waste (e.g., oil-based drill cuttings, water-based bentonitic drilling fluids, produced water, trash, tank bottoms); ii. The regulatory classification of the waste (e.g., E&P Waste, non-E&P Waste, hazardous waste, non-hazardous solid waste); iii. A general description of the process(es) that generated the waste; iv. An estimate of expected volumes or amounts of waste generated, and a frequency and duration of the waste stream generation; Operational Phase Type of Waste Classification Generating Process Amount & Frequency Construction, Drilling, Completions, Flowback, Production, Spill Response & Remediation, Facility Decommissioning, Plugging & Abandonment General Trash Non-E&P Waste General trash disposed in on- site containers 9 cubic yards per well per week Sewage Non-E&P Waste Human waste from site personnel 95 barrels per well per week Drilling, Completions, Plugging & Abandonment Water-based Bentonitic Drilling Fluids E&P Waste Well installation, plugging activities 67 barrels per well, one-time Drilling Drill Cuttings E&P Waste Well installation 339 cubic yards per well, one- time Completions, Flowback Frac Sands E&P Waste Removed from production separators 500 lbs. per well per month Flowback, Production Produced Water E&P Waste After well turned over to production 1,500 barrels per well first 3 months, then reduced to ~300 barrels, daily Spill Response & Remediation Soil impacted from spills of production fluids E&P Waste Potential cleanup of spills Varies per well/incident 385 v. Any physical or chemical hazards the waste stream may pose, and whether or not field testing or environmental laboratory analyses are needed to further assess these hazards; None of the anticipated waste streams are expected to pose a health or environmental risk to employees; however, to assure the protection of employees, contractors, and the environment, each worker wears a four-gas monitor. Additionally, Chevron works with each disposal facility and transporter to assure that we abide by all regulatory requirements regarding shipping and disposal of all wastes generated from operations. vi. A detailed description of all intended onsite treatment, storage, and disposal, including the use of any pits; Chevron does not anticipate conducting any onsite treatment or disposal of waste and no pits will be used. All wastes will be temporarily stored onsite, as detailed under vii below, prior to being transported to permitted offsite commercial disposal facilities. vii. A detailed description of the placement and use of storage areas, and treatment methods; and Construction  General trash: enclosed trash containers, hauled to commercial facility  Sewage: chemical toilets or enclosed sewer system, hauled to commercial facility Drilling  Water-based Bentonitic Drilling Fluids: contained in steel tanks, hauled to commercial facility  Oil-based Drilling Fluids: returned up the annulus will be filtered to remove solids through the closed loop system, cuttings shaken out into impervious bins above a mat and hauled off-site for disposal while fluids will be routed through a suction tank and mud pump, remixed and recirculated.  Drill cuttings: contained in 3-sided high wall steel bins, hauled to commercial facility  General trash: enclosed trash containers, hauled to commercial facility  Sewage: chemical toilets or enclosed sewer system, hauled to commercial facility Completions  Frac sands: direct placement into truck, hauled to commercial facility  General trash: enclosed trash containers, hauled to commercial facility 386  Sewage: chemical toilets or enclosed sewer system, hauled to commercial facility Flowback  Frac sands: periodically drained via vacuum truck, hauled to commercial facility  Produced water: piped into existing infrastructure, private disposal by off-lease injection  General trash: enclosed trash containers, hauled to commercial facility  Sewage: chemical toilets or enclosed sewer system, hauled to commercial facility Production  Produced water: piped into existing infrastructure, private disposal by off-lease injection  General trash: enclosed trash containers, hauled to commercial facility  Sewage: chemical toilets or enclosed sewer system, hauled to commercial facility Spill Response and Remediation  Soil impacted from spills of production fluids: excavated and direct placement into dump trucks or storage bins, hauled to commercial facility  General trash: enclosed trash containers, hauled to commercial facility  Sewage: chemical toilets or enclosed sewer system, hauled to commercial facility Facility Decommissioning  Any hazardous or non-hazardous waste generated, or equipment and materials removed during decommissioning: characterized and segregated appropriately, hauled to commercial facility  Soil impacted from spills of production fluids: excavated and direct placement into dump trucks or storage bins, hauled to commercial facility  General trash: enclosed trash containers, hauled to commercial facility  Sewage: chemical toilets or enclosed sewer system, hauled to commercial facility 387 Plugging and Abandonment  Equipment and materials removed during plugging and abandonment: characterized and segregated appropriately, hauled to commercial facility  Soil impacted from spills of production fluids: excavated and direct placement into dump trucks or storage bins, hauled to commercial facility  General trash: enclosed trash containers, hauled to commercial facility  Sewage: chemical toilets or enclosed sewer system, hauled to commercial facility viii. An evaluation of applicable surface owner and lease agreement conditions pertaining to waste treatment, storage, and disposal. Chevron does not plan to treat or dispose of any wastes onsite. As noted above, all wastes are temporarily stored onsite in appropriate containers before being transported to offsite commercial disposal facilities. b. For wastes disposed onsite, reused, recycled, and for remediation, describe how the Operator will comply with Table 915-1 by detailing: i. Methods for adequate collection of representative waste profile samples; ii. The number of samples needed for waste characterization; iii. What analyses will be run and what analytical methods will be used; and iv. A certification that the analyses will be run by an accredited or certified environmental laboratory and that proper field protocol will be employed during sampling. Chevron does not plan to dispose onsite or reuse any wastes. The only recycling that may occur will be for metal wastes, such as drill pipe, casing, and tubing, that may be recycled after it has been screened for release. In the event that remediation is required in response to a spill or release, Chevron will detail the methods and procedures that will be used to collect samples to adequately characterize the spill or release and verify that the location has been adequately remediated in the Form 19 and/or Form 27 submitted to ECMC in accordance with the 900 Series of Rules. All samples will be analyzed by an accredited or certified laboratory for the analytes prescribed in Table 915-1 or an alternative suite of analytes approved by the ECMC. c. For E&P Waste being transported offsite1, include: i. A description of the Operator’s recordkeeping system for all required transport records, including verification of where and for how long the records will be kept (see General Notes section, Rule 905.b.(3)); ii. A description of all intended offsite treatment, storage, and disposal methods; 388 iii. A description of haul routes; the plan may reference the Access Road Map so long as haul routes are clearly identified on that map. Additional information can be found in Rule 905.b; iv. Information about the receiving facility (e.g., name and location of spread field or name of disposal well operator and location of disposal well facility); and v. A description of the methodology for collecting waste characterization and profile samples for selected management or disposal of waste if required by the disposal facility. All shipments of wastes are documented and tracked via manifests and/or other appropriate documentation (invoice, bill or ticket), and all records of E&P waste transportation comply with ECMC Rule 905.b. Disposal records include the date of transport, identity of the transporter, location of the waste pickup, type and volume of waste, and the name and location of the disposal site. Records, either electronic or hard copy, are retained, for not less than five years. The haul routes for this location are those identified on the Access Road Map submitted as part of the ECMC Form 2A permitting application. Produced water will be injected, recycled, or beneficially reused per Chevron or its business partners current or future approved permits, and solid wastes will be disposed of in third party landfills that are approved by CDPHE to accept E&P exempt wastes. All third-party transporters and disposal sites meet the state requirements to accept E&P waste streams. Additionally, Chevron inspects each facility as a part of its internal Third-party Waste Stewardship (TWS) process to provide additional assurance that disposed wastes will have no unintended environmental impacts. Currently, Chevron utilizes the following third-party transporters and disposal facilities: Third-Party transporters  Clean Harbors  Safety Kleen  Waste Management  1888 Industrial Services  Atlas Energy Services  Fortress Development Solutions  Northern Plains Trucking  Frontrange Hydro Bandits 389 Third-Party disposal facilities  Clean Harbors  Safety Kleen  Waste Management • Buffalo Ridge Landfill • CSI Landfill • North Weld Landfill (Ault)  Republic Services • Tower Landfill  NGL Water Solutions DJ, LLC  High Sierra Injection Facilities Chevron maintains multiple waste profiles for wastes that are transported to permitted offsite disposal facilities. If a receiving facility requires a profile not previously established, Chevron will work closely with the facility to ensure that the number of samples collected, and analyses performed, will adequately characterize the waste according to the receiving facility’s requirements. 3. For all waste streams, provide an evaluation of opportunities to reduce the volume generated, reduce toxicity, put to a beneficial use, reuse, or recycle. Reuse and Recycling At this time, Chevron does not anticipate implementing beneficial land reuse and does not have the necessary infrastructure in place in this area to support widescale produced water/flowback recycling. Chevron may propose plans in the future for managing these waste streams through beneficial use, reuse, and recycling for approval, by the Director. Chevron will continue to evaluate new technology for effective and efficient application for the management of E&P waste. If opportunities for reuse and recycling become practicable, a reuse and recycling plan will be submitted as described in Rule 905.a.(3). 4. Provide a contingency plan for managing waste streams in the event the E&P Waste exemption no longer applies to a given waste stream. If E&P Waste exemptions no longer apply to a given waste stream, the waste stream would require shipment to a facility that can accept hazardous waste. Currently, Clean Harbors handles the small amount of hazardous waste disposal generated for operations. 390 5. Best Management Practices (BMPs) • Wastes stored onsite will be stored in compatible containers that are regularly inspected to ensure they are in good condition and free of excessive wear, structural issues or other defects that may impact their effectiveness. • All trash receptacles will be designed, maintained, and operated to exclude wildlife, and to protect public safety, the environment, and wildlife from exposure to overflowing, leak prone or insecure trash receptacles. • Chevron utilizes only licenses third-party transporters for all waste transport and coordinates with Relevant Local Government on haul routes for transport of waste. • Chevron will not bury or burn trash or other waste materials at an oil and gas location. • Some wastes generated from oil and gas operations have the potential to be subject to TENORM regulation and, when required, will be disposed of at licensed facility authorized to receive TENORM wastes. Chevron will comply with the requirements of 6 CCR 1007-1 Part 20 – Registration and Licensing of Technologically Enhanced Naturally Occurring Radioactive Material (TENORM), which became effective on January 14, 2021. 391 Topsoil Protection Plan Date: 11/10/2023 Location: OGDP SKR 698-10-BV / SKR 698-10-BV Pad Legal Description: Tract 72, SWSW of Section 10 & NWNW of Section 15, Township 6 South, Range 98 West, 6th P.M., Weld County, Colorado 392 Location Information This document provides site-specific information for the SKR 698-10-BV (Skinner Ridge) Pad (referred to as the “Pad”) located within OGDP SKR 698-10-BV. A pre-application meeting with Garfield County, CDPHE, ECMC, CPW, and Chevron was held on October 12, 2023. This application will be an amendment to the existing SKR-66S98W/10 SWSW Pad, permitted with ECMC under location ID #336056. This Pad was initially permitted for the drilling and completion of 22 wells; however, those wells were never drilled. Instead, the location was utilized as the Skinner Ridge Storage Facility, permitted by both ECMC, under location ID #447846, and Garfield County, under permit LIPA 6428. The information in this document relates specifically to the time during the construction, drilling, completion, and production of the two (2) proposed horizontal wells on the well pad portion of the location and the construction and operation of the facility portion of the location, which will receive production from the two wells. Additionally, a pilot hole for geothermal testing will be drilled in one of the wells, but the pilot hole will be plugged prior to drilling the horizontal leg of the well. The existing location is located off Garfield County Road 211 (Clear Creek Road) approximately 16.7 miles northwest of De Beque, Colorado. The Pad lies on Tract 72, and is situated on two sections, the SWSW of Section 10 and the NWNW of Section 15, Township 6 South, Range 98 West, 6th P.M. zoned Resource Lands per Garfield County. The existing Skinner Ridge Storage Facility disturbance area is 6.2 acres, and an additional 0.7 acres of disturbance is proposed for construction of stormwater detention ponds and drainage channels at the SKR 698-10-BV Pad. The working pad surface (WPS) will be 3.8 acres. The Pad disturbance area will be reduced to 2.3 acres during interim reclamation. The Pad is located on Garfield County Parcel 213732100008 owned by Chevron U.S.A., Inc. The location is currently used as a storage yard and all storage equipment and facilities will be relocated prior to drilling the proposed wells. The wells on the SKR 698-10-BV Pad will produce to the proposed production facility portion of the location and be tied into Chevron’s existing Central Production Facility (CPF) via a proposed gas and liquids line. Proposed equipment on the Pad will include separators, pigging stations, a gas meter, pipe skid, an instrument air skid, a skid drain vault, a chemical injection skid, a communication tower, solar skids, a maintenance tank, heat trace equipment, a transformer or electric generators, switchracks, and a battery box. A temporary MLVT, located on the nearby Skinner Ridge-66S98W/22NENW Pad (Location ID# 324358), will be utilized for completion operations. Phase Duration (days) Estimated Start Date Construction (Daylight Only) 10 days 2nd Quarter 2024 Drilling 80 days 3rd Quarter 2024 Completion 23 days 3rd Quarter 2025 Flowback N/A Flowing back directly to permanent facility Production 30 years 3rd Quarter 2025 Interim Reclamation (Daylight Only) 60 days 2nd Quarter 2026 393 Potentially Impacted Parties The Working Pad Surface (WPS) of the SKR 698-10-BV Pad is within 2,000 feet of zero (0) Residential Building Units (RBUs), zero (0) High Occupancy Building Units (HOBUs), and zero (0) Designated Outside Activity Areas (DOAAs). The Pad is located within a Disproportionately Impacted Community (DIC). The location is within ECMC designated High Priority Habitat (HPH) per rule 1202.d for Elk Winter Concentration Area and Elk Severe Winter Range and rule 1202.c for Aquatic Sportfish Management Waters. Rule Reference 1002.c. Protection of soils. All stockpiled soils shall be protected from degradation due to contamination, compaction and, to the extent practicable, from wind and water erosion during drilling and production operations. Best management practices to prevent weed establishment and to maintain soil microbial activity shall be implemented. Per Rule, 1002.c, all stockpiled soils shall be protected from degradation due to contamination, compaction and, to the extent practicable, from wind and water erosion during drilling and production operations. Existing topsoil stockpiles are stabilized along the east side of the existing location as shown on the attached Layout Drawings. Requirements / Recommendations 1. The Topsoil Protection Plan should be completed by a person with experience in field soil identification and reclamation techniques and standards. A Chevron designated employee completed the Topsoil Protection Plan. 2. On both crop land and non-crop land, soil horizons must be identified based on physical characteristics to allow for proper stockpile segregation and storage. In the event there is a plow layer, the entire plow layer will be considered topsoil and must be salvaged. Topsoil was segregated, stored, and stabilized during initial construction of the existing storage facility. Minimal topsoil excavation, consisting of less than one acre of disturbance, is anticipated during the proposed oil and gas operations for the construction of stormwater detention ponds and drainage channels. Any disturbed topsoil will be segregated, stored, and stabilized with existing stockpiles for future reclamation operations. 3. The plan should use standard terminology and indicators to define the soil horizons. All applicable horizons should be identified, including the A horizon (topsoil), B horizon (subsoil) and C horizon (substratum or parent material). Topsoil was segregated, stored, and stabilized during initial construction of the existing storage facility, and minimal additional topsoil is anticipated to be excavated during the proposed oil and gas operations. Any disturbed topsoil will be segregated, stored, and stabilized with existing stockpiles for future reclamation operations. 394 4. Soil test pits should be dug at the proposed location to determine the site-specific soil horizons and soil thicknesses. Topsoil was segregated, stored, and stabilized during initial construction of the existing storage facility, and minimal additional topsoil is anticipated to be excavated during the proposed oil and gas operations. Therefore, no soil test pits were dug at the location. 5. The plan should include a scaled aerial photograph or diagram showing the USDA Natural Resource Conservation Service (NRCS) soil types and the site-specific soil test pit locations. The NRCS Custom Soil Resource Report has been attached. Topsoil was segregated, stored, and stabilized during initial construction of the existing storage facility. No test pits were identified as there will be minimal topsoil disturbance during the proposed oil and gas operations. 6. The plan should include a description of the soil horizon thicknesses and include an evaluation of the soil characteristics. The evaluation may include descriptions of the texture, Munsell color, structure type, organic matter, density and gravel content. Topsoil was segregated, stored, and stabilized during initial construction of the existing storage facility, and minimal topsoil is anticipated to be excavated during the proposed oil and gas operations. Therefore, the soil was not evaluated at the location. 7. Total available topsoil to be salvaged in cubic yards, per the sampling profiles. Topsoil was segregated, stored, and stabilized during initial construction of the existing storage facility. Minimal topsoil excavation, consisting of less than one acre of disturbance, is anticipated during the proposed oil and gas operations for the construction of stormwater detention ponds and drainage channels. Any disturbed topsoil will be segregated, stored, and stabilized with existing stockpiles for future reclamation operations. 8. Seeding and Soil Stabilization. Please refer to the Stormwater Management Plan for the SKR 698-10-BV Pad, specifically Section 2: Site Description and Section 2.2: Sequence of Major Construction Activities for a description of construction stages and Section 4: Stormwater Management Controls Section 4.1: Control Measure Implementation for stabilization and control measures implemented during each stage of operations. Additional seeding and soil stabilization methods are discussed below. Seeding (S) Description Temporary seeding can be used to stabilize disturbed areas that will be inactive for an extended period. Permanent seeding should be used to stabilize areas where surface disturbance activities are complete and where the surface will not be otherwise stabilized. Effective seeding includes preparation of a seedbed, selection of an appropriate seed mixture, proper planting techniques, and protection of the seeded area with mulch, geotextiles, or other appropriate measures. This typically occurs in a multi-step process 395 which includes: ripping, seeding, spreading a mulch layer such as straw, and, if applicable, crimping the straw into the soil. Seeding establishes vegetation that reduces erosion and sediment displacement by stabilizing disturbed areas in a manner that is economical, adaptable to site conditions, and allows selection of the most appropriate plant material. Seeding also: o Absorbs the impact of raindrops; o Reduces the velocity of runoff; o Reduces runoff volumes by increasing water percolation into the soil; o Binds soil with roots; o Protects soil from wind; o Improves wildlife habitat; and o Restores the site to a natural state. Applicability Seeding is most effective on slopes no steeper than 2:1. Seeding may be implemented on steeper slopes, but care should be taken to mitigate erosion and loss of seed and topsoil. Seeding may be used as a permanent control or a temporary control in areas where exposed soil surfaces are not to be re- graded for extended periods. Such areas include temporarily idle areas, soil stockpiles, berms, temporary road banks, etc. Permanent seeding practices are applied to disturbed areas not otherwise stabilized with rock, road base, or similar. Limitations The effectiveness of seeding can be limited by: o High erosion potential during establishment; o The need for stable soil temperature and soil moisture content during germination and early growth; o The need to re-seed areas that fail to establish; and o Limited seeding times depending on the season. o Vegetation should not be established on slopes that are unsuitable due to inappropriate soil texture, poor internal structure or internal drainage, volume of overland flow, or excessive steepness, until measures have been taken to correct these problems. Proper seedbed preparation and the use of quality seed are important in this practice. Failure to carefully follow sound agronomic recommendations will often result in an inadequate stand of vegetation that provides little or no erosion control. Seeding does not immediately stabilize soils. Maintain necessary erosion and sediment control practices, such as mulching, until vegetation is established. 396 Design Criteria Successful vegetation establishment can be maximized with proper planning, consideration of soil characteristics, selection of seeds mixes that are suitable for the site, adequate seedbed preparation, fertilization, timely planting; and regular maintenance. Seed mixes will be selected based on National Resource Conservation Service (NRCS) seed mixes and be approved by landowners. Landowners may require specified seed mixes. When to Seed Areas to be stabilized with vegetation must be seeded or planted once grading is completed, unless temporary stabilization measures are in place. Temporary stabilization measures should be installed through “no growth” periods during winter months until the weather can support seed growth. Seed Mix Climate, soils, and topography are major factors that dictate the suitability of plants for a particular site. Vegetation that has adapted to the site, has strong roots, and provides good ground cover should be used. Seed mixes will be selected based on National Resource Conservation Service (NRCS) seed mixes and must be approved by landowners. The attached Seed Mix table identifies the proposed seed mix for SKR 698-10-BV Pad. Final seed mix will be determined in consultation with the landowner and the land use at the time of reclamation. Construction Specifications Prior to permanent seeding application ensure that areas to be revegetated have soil conditions capable of supporting vegetation by spreading preserved topsoil prior to planting. Topsoil should be segregated during grading operations and spread on areas prior to seeding. Topsoil should be viewed as an important resource to be utilized for vegetation establishment, due to its water-holding capacity, structure, texture, organic matter content, biological activity, and nutrient content. The rooting depth of most native grasses in the semi-arid Denver metropolitan area is 6 to 18 inches. Soils may also need to be amended to provide an appropriate plant-growth medium. Organic matter, such as well-digested compost, can be added to improve soil characteristics conducive to plant growth. Other treatments can be used to adjust soil PH conditions when needed. Soil testing may be completed to determine and optimize the types and amounts of amendments that are required. If the disturbed ground surface is compacted, the surface should be prepared by ripping the area to break up compaction. If adding compost to the existing soil, it can be mixed in after the ripping process. o Add fertilizer and/or lime, if necessary. Lime and fertilizer may be incorporated into the top 2 to 4 inches of the soil if possible. The addition of lime is equally as important as applying fertilizer. Lime will modify the pH and supply calcium and magnesium. Its effect on pH makes other nutrients more available to the plant. o The appropriate seed shall be evenly applied with a broadcast seeder, drill, cultipacker, or hydro-seeder. Seeding depth should be one-quarter to one-half inch. 397 Maintenance Considerations The frequency of inspections should be in accordance with the SWMP. Vegetation is considered established when a uniform density of at least 70% of pre-disturbance background levels has been reached. Seeded areas should be inspected for failure and any necessary repairs and re-seeding should be made within the same season if possible. Hydro-mulch (H) Description Fiber Matrix: Fiber Matrix Hydro-mulch includes a wide range of soil binders, including Flexible Growth Medium (FGM) that provides temporary soil stabilization. Soil binders may be applied alone or as tackifiers in conjunction with mulching and seeding applications. The stabilizer is sprayed onto the surface of exposed soil to temporarily bind the soil in place and minimize erosion from runoff and wind. These materials are easily applied to the surface of the soil, can stabilize areas where vegetation cannot be established, and provide immediate protection. Soil binders are typically applied to disturbed areas requiring short-term temporary protection. Because soil binders can often be incorporated into the work, they may be a good choice for areas where grading activities will soon resume. Hydro-mulch can also be applied to stockpiles to prevent water and wind erosion. Posi-Shell®: Posi-Shell® is a cover system that is more durable than a Fiber Matrix Hydro-mulch. Posi- shell creates a non-flexible, cohesive, hard surface comprised of a blend of clay binders, reinforcing fibers, and polymers. When mixed with water, this mix produces a spray-applied mortar forming a thin layer of durable stucco. This surface conforms and adheres to underlying topography and is more resistant to weather and precipitation and requires less re-application. For this reason, Posi-Shell is used in longer- term situations when standard Fiber Matrix Hydro-mulch is ineffective (i.e. steep slopes, sandy soils, etc.). Posi-shell is delivered through any spray application equipment like the Fiber Matrix Hydromulch. Applicability Use hydro-mulch alone in areas where other methods of stabilization are not effective because of environmental constraints or use them in combination with vegetative or perimeter practices to enhance control of erosion and sedimentation. Posi-Shell can be utilized to protect ditches, stabilize slopes, and cover stockpiles. Limitations o Soil binders are temporary in nature and may need reapplication. o Soil binders require a minimum curing time until fully effective, as prescribed by the manufacturer, which may be 24 hours or longer. Soil binders may need reapplication after a storm event. o Soil binders will generally experience spot failures during heavy rainfall events. o Soil binders do not hold up to pedestrian or vehicular traffic across treated areas. 398 o Soil binders may not penetrate soil surfaces made up primarily of silt and clay, particularly when compacted. o Some soil binders may not perform well with low relative humidity. Under rainy conditions, some agents may become slippery or leach out of the soil. o Some soil binders may not cure if low temperatures occur within 24 hours of application. Design Criteria o Closely follow the manufacturer's recommended application procedures to prevent the products from pooling and creating impervious areas where stormwater cannot infiltrate. o Suitability to situation: Consider where the soil binder will be applied, if it needs a high resistance to leaching or abrasion, and whether it needs to be compatible with existing vegetation. o Determine the length of time soil stabilization will be needed, and if the soil binder will be placed in an area where it will degrade rapidly. o In general, slope steepness is not a discriminating factor. o Soil types and surface materials: Fines and moisture content are key properties of surface materials. o Consider a soil binder's ability to penetrate, likelihood of leaching, and ability to form a surface crust on the surface materials. o Frequency of application: The frequency of application can be affected by subgrade conditions, surface type, climate, and maintenance schedule. Maintenance Considerations Soil binders tend to break down due to natural weathering. Weathering rates depend on a variety of site-specific and product characteristics. Consult the manufacturer for recommended reapplication rates and reapply the selected soil binder as needed to maintain effectiveness. Inspect chemically stabilized areas regularly for signs of erosion, and if necessary, reapply the stabilizer. Soil binders can fail after heavy rainfall events and may require reapplication. In particular, soil binders will generally experience spot failures during heavy rainfall events. If runoff penetrates the soil at the top of a slope treated with a soil binder, it is likely that the runoff will undercut the stabilized soil layer and discharge at a point further down slope. Areas where erosion is evident should be repaired and soil binder or other stabilization reapplied, as needed. Care should be exercised to minimize the damage to protected areas while making repairs. Removal Hydro-mulch does not need be removed. This includes the Posi-Shell®, which can be tracked into slopes when intermediate protection is no longer needed. 399 Soil Roughening – All Types (SR) Description Soil roughening may be accomplished by ripping, furrowing, disking, or tracking the soil to create trenches and other variations in soil surface. Surface roughening is used as a temporary CM to reduce the speed of runoff, increase infiltration, traps sediment, and prepares the soil for seeding and planting by capturing moisture for seed. Soil roughening can be an effective CM for controlling wind erosion. Applicability Soil roughening can be applied in most areas and is most effective in areas that do not have steep slopes or in soils with a high concentration of clay that may prevent infiltration of stormwater. The surface roughening technique of ripping can be applied in most areas as either a primary or secondary control as part of a series of CMs. Ripping is best used in areas where sheet flow of stormwater occurs and when used in a series to produce a treatment train. Limitations Depending on the surface and/or soil makeup, some areas might not be suitable for all ripping techniques, for example rock formations. o Soil roughening is not appropriate for rocky slopes. o Soil roughening does not work well in sandy soils. o Soil compaction might occur when roughening with tracked machinery. o Furrows, trenches, and tracking variations can easily become inundated with wind- blown sediment during high wind events. o Soil roughening has limited effectiveness during heavy rains. o If roughening is washed away in a heavy storm, the surface will have to be re- roughened. Design Criteria Soil roughening should be used in conjunction with other CMs such as mulching, seeding, or tackifier applications and should be along the contour of slopes. Surface roughening should be completed by going against the natural contours to slow stormwater velocity. Depths of trenches and furrow may vary depending on soil type and the type of soil roughening equipment that is used. Soil roughening can be installed as a perimeter control and is often combined with other CMs such as diversion ditches. All underground utilities should be located prior to the installation of ripping or other roughening that penetrates the surface. Construction Specifications Soil roughening should be completed by going against the natural contours to slow 400 stormwater velocity. Ripped depths may vary depending on soil type and the distance between contours may be modified. Ripping should be installed at the outer perimeter of the construction area to avoid damage by vehicle traffic. All underground utilities should be located prior to installation of roughening that penetrates the surface. o To slow erosion, roughening should be done as soon as possible after grading activities have ceased (temporary or permanently) in an area. o Cut and fill slopes and soil stockpiles should be roughened whenever possible. o Do not blade or scrape the final fill slope face after roughening. o Excessive compacting of the soil surface should be avoided during roughening. o When ripping, tool bar should have a minimum of three mounted rippers. Ripped depths should be at least 6 inches in depth and not to exceed 18 inches. Maintenance Considerations The frequency of inspections should be in accordance with the SWMP. Roughening might need to be repeated after storm events or episodes of high wind. Straw Mulching (SM) Description Mulching consists of evenly applying straw, hay, shredded wood mulch, bark or compost to disturbed soils and securing the mulch by crimping. Mulching helps reduce erosion by protecting bare soil from rainfall impact, increasing infiltration, and reducing runoff. Although often applied in conjunction with temporary or permanent seeding, it can also be used for temporary stabilization of areas that cannot be reseeded due to seasonal constraints. Straw or hay mulch can be used to provide erosion control and promote germination for newly seeded areas. When installed correctly, the mulch is anchored in the ground, simulating a root system. This artificial root system provides wind and surface erosion control by stabilizing the soils. Germination is facilitated through moisture retention, from precipitation events or irrigation. Applicability Mulch can be used during seeding to help protect the seedbed and stabilize the soil. Mulch can also be used as a temporary cover on low to mild slopes to help temporarily stabilize disturbed areas where growing season constraints prevent effective reseeding. Disturbed areas should be properly mulched and or seeded, promptly after disturbance activities are complete or when activities are idle for a prolonged period on portions of the site not otherwise stabilized. Limitations Adequate soil preparation is needed to ensure proper and significant depth of crimping. If not installed correctly, mulch can be susceptible to wind or surface erosion. Mulch should 401 not be installed during windy conditions. Design Criteria Application rates need to be adjusted according to slope, soil conditions, season, and other factors that may require longer term cover and protection. A variety of mulches can be used effectively at construction sites. Clean, weed-free and seed-free straw should be applied evenly at a rate of 2 tons per acre and must be tacked or crimped by a method suitable for the condition of the site. Prior to mulching, surface-roughen areas by ripping, rolling with a crimping or punching type roller, or by track walking. Track walking should only be used where other methods are impractical because track walking with heavy equipment typically compacts the soil. Construction Specifications Straw mulch must be anchored on the surface. This can be accomplished mechanically by crimping. Anchoring with a crimping implement is preferred and is the recommended method for areas flatter than 3:1. Mechanical crimpers must be capable of tucking the long mulch fibers into the soil to an ideal depth of 3 inches without cutting mulch strands. An agricultural disk, while not an ideal substitute, may work if the disk blades are dull or blunted and set vertically. Maintenance Considerations After mulching, the bare ground surface should not be more than 10 percent exposed. Reapply mulch, as needed, to cover bare areas. Wind Erosion Control (WEC) Description Wind erosion and dust control CMs help to keep soil particles from entering the air as a result of land disturbing construction activities. These CMs include a variety of practices generally focused on either graded disturbed areas or construction roadways. For graded areas, practices such as seeding and mulching, use of soil binders, site watering, or other practices that provide prompt surface cover should be used. Soil roughening methods can be effective CMs controlling wind erosion. Applicability Wind erosion controls CMs are suitable during the following construction activities: o Construction vehicle traffic on unpaved roads; o Drilling and blasting activities; o Sediment tracking onto paved roads; o Soils and debris storage piles; o Batch drop from front-end loaders; 402 o Areas with un-stabilized soil; and o Final grading/site stabilization. Limitations o Watering prevents dust only for a short period and should be applied daily (or more often) to be effective; o Over watering may cause erosion; o Oil or oil-treated sub grade should not be used for dust control because the oil may migrate into drainage ways and/or seep into the soil; o Effectiveness depends on soil, temperature, humidity, and wind velocity; o Chemically treated sub grades may make the soil water repellant, interfering with long- term infiltration and the vegetation/re-vegetation on the site. Some chemical dust suppressants may be subject to freezing and may contain solvents and should be handled properly; o Asphalt, as a mulch tack or chemical mulch, requires a 24-hour curing time to avoid adherence to equipment, worker shoes, etc. Application should be limited because asphalt surfacing may eventually migrate into the drainage system; o In compacted areas, watering and other liquid dust control CMs may wash sediment or other constituents into the drainage system. Design Criteria Many local agencies require dust control in order to comply with local laws, opacity laws (visibility impairment), and the requirements of the Clean Air Act. The following are measures that local agencies may have already implemented as requirements for dust control from contractors: o Limit open area of disturbance when possible. o Limit construction and grading activity during times where high winds are present. o Apply water or synthetic stabilizers when necessary and alternative procedures do not provide desired results. Construction Specifications Dust control CMs generally stabilize exposed surfaces and minimize activities that suspend or track dust particles. For heavily traveled and disturbed areas, wet suppression (watering), chemical dust suppression, gravel asphalt surfacing, temporary gravel construction entrances, equipment wash-out areas, and haul truck covers can be employed as dust control applications. Permanent or temporary vegetation and mulching can be employed for areas of occasional or no construction traffic. Preventive measures would include minimizing surface areas to be disturbed, limiting on-site vehicle traffic to 15 miles per hour and controlling the number and activity of vehicles on a site at any given 403 time. For chemical stabilization, there are many products available for chemically stabilizing gravel roadways and stockpiles. If chemical stabilization is used, the chemicals should not create any adverse effects on stormwater, plant life, or groundwater. Maintenance Considerations Inspect and verify that dust control practices and CMs are in place prior to the commencement of dust producing activities. Inspect routinely looking for excessive airborne dust from vehicle or construction activities. If noted, implement appropriate dust control CMs as needed. Check areas protected to ensure coverage. Most dust control CMs require frequent application and maintenance. Utilize practice-based controls such as limiting disturbance and limiting activity during high winds whenever possible. 404 9. Site-specific Best Management Practices (BMPs). SKR 698-10-BV Pad Stockpiled soils shall be protected from degradation due to contamination, compaction, as well as wind and water erosion to the best extent practicable by implementing control measures (CM’s) described in Operator’s “Field-Wide Stormwater Control Measure (CM) Manual For Construction Activities”. Utilizing these CM’s, as described, shall also aid in the prevention of weed establishment, and help maintain soil microbial activity by promoting vegetative growth. CM’s will be implemented based upon site design, level of risk for soil degradation, as well as the anticipated duration for a stockpile to remain in place. Topsoil was segregated, stored, and stabilized during initial construction of the existing storage facility, and minimal additional topsoil is anticipated to be excavated during the proposed oil and gas operations. The following BMPs are anticipated to be used for protection of topsoil at this location: • Any topsoil disturbed during construction activities will be segregated, stored, and stabilized with existing topsoil stockpiles for future reclamation. • Any stockpiles used or disturbed during interim reclamation activities will be restabilized with a combination of erosion controls, including temporary seeding, hydro/straw mulch, and/or surface roughening. • Heavy equipment tracking over soil stockpiles will be minimized to avoid soil compaction. • The construction layout for the location has been designed in a way that a potential spill on location would drain towards the infiltration pond and avoid impacting topsoil stockpiles. • Chevron will monitor the site for the presence of noxious weeds. If encountered, Chevron will employ a third-party consultant knowledgeable in identifying such species and implement weed control measures consistent and in compliance with the Colorado Noxious Weed Act. Management will be performed by either mowing or spraying and in some rare occasions, both methods may be necessary. • Please refer to the site-specific Stormwater Management Plan for additional BMPs regarding erosion and sediment controls for the location. • Please refer to the site-specific Interim Reclamation Plan for additional BMPs regarding seeding and revegetation for the location. 405 Exhibits/References/Appendices Layout Drawings NRCS Custom Soil Resource Report Table S – Seed Mix Table 406 UELS, LLCCorporate Office * 85 South 200 EastVernal, UT 84078 * (435) 789-1017 ENGINEERING & LAND SURVEYING NOTES: ·Contours shown at 2' intervals. CONSTRUCTION LAYOUT - PLAN VIEW SURVEYED BY DRAWN BY DAYTON SLAUGH 06-29-23 SCALE D.R.B.05-01-23 1" = 60' 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 ' HA 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: 5 11-16-23 T.L.L. (REMOVE FLARE STACK & UPDATE LOD & EXISTING DISTURBANCE) 407 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 CONSTRUCTION LAYOUT - DETAIL SHEET SURVEYED BY DRAWN BY DAYTON SLAUGH 06-29-23 SCALE T.L.L.07-10-23 1" = 60' 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 ' REV: 4 11-16-23 T.L.L. (UPDATE LOD & LABELS) 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 11-17-23 408 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 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' 409 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) 410 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) 411