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0 Q ante6group Well Destruction Work Plan 2085 East Main Street, Stockton, California 1.0 INTRODUCTION On behalf of BP Products North America, Inc. (BP),Antea°Group has prepared this Well Destruction Work Plan for former Atlantic Richfield Company(ARCO)Service Station No.559 located at 2085 East Main Street in Stockton,California (the "Site"; Figure 1).The purpose of this Work Plan is to propose destruction methods for the five groundwater monitoring wells at the Site. In correspondence dated March 16,2022,the Central Valley Regional Water Quality Control Board (CVRWQCB)stated destruction of the groundwater monitoring wells is required prior to issuance of a No Further Action determination letter(Appendix A).Current and past Site configurations,soil borings, monitoring wells,and sampling locations are depicted on Figure 2. The Site is located on the northwest corner at the intersection of East Main Street and C Street in Stockton, California,Assessor Parcel Number(APN) 153-102-100-000. The property is approximately 22 feet in elevation relative to mean sea level with a general topographic slope to the west-northwest.The Site is currently an active,self-serve car wash with two vacuum stations and four carwash ports.A mix of commercial and residential properties surround the Site. Please refer to Figure 2 for the Site Plan and Appendix B for additional Site description and a history of environmental investigations conducted at the Site.Soil Boring and Monitoring Well Construction Details are listed in Table 1 and the well logs are provided as Appendix C. 2.0 DECOMMISSIONING ACTIVITIES The work described in this section will be completed under the supervision of a State of California Professional Geologist, in accordance with the California Department of Water Resource Well Standards, and the San Joaquin County Department of Environmental Health Standards. Antea Group proposes to decommission groundwater monitoring wells MW-1, MW-2, MW-4 through MW-6 by pressure grouting and restoring surface conditions.The destruction of each well will be completed before the destruction of another well is commenced. 2.1 PRE-FIELD HEALTH AND SAFETY Antea Group will coordinate with a California C-57 licensed drilling contractor to destroy the Site wells. Prior to field activities,Antea Group will prepare a Health and Safety Plan (HASP) in accordance with Title 8,Section 5192 of the California Code of Regulations.The HASP will contain a list of emergency contacts and a map showing the route to the nearest emergency facility. Personnel will review the HASP daily while conducting field activities. In addition,Antea Group will acquire permits from the San Joaquin County Department of Environmental Health Standards and the City of Stockton as needed. Antea Group and its subcontractors will comply with all permit requirements. At least 48 hours prior to commencing ground disturbance,Antea Group will mark the Site with white paint and open an Underground Service Alert(USA)ticket. A private utility locator will also be contracted to clear the area around the wells of subsurface assets using electro-magnetic locating equipment and ground penetrating radar. �I NOGEN" ALLIANCE us.anteagroup.com 1