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Well Destruction Work Plan FORMER APACHE PLASTICS 2050 Fremont Street, Stockton, California 1.0. INTRODUCTION At the request of Mr. Bill Stoermer of Fremont Plaza Investments, AdvancedGeo, Inc. (AGI) has prepared this Well Destruction Work Plan (Work Plan) for the destruction of a total of three (3) groundwater monitoring and remediation wells at 2050 East Fremont Street, Stockton, California (site). The groundwater monitoring wells, and remediation wells are single-completed with 2-inch diameter well casings in 8-inch diameter boreholes. The site and the surrounding area are illustrated in Figure 1. Structures, soil borings and well locations are illustrated in Figure 2. Well construction details are summarized in Table 1. This Work Plan provides procedures for the destruction of all groundwater monitoring and remediation wells that will interfere with construction activities at the site. All wells will be destroyed by over-drilling methods and in accordance with San Joaquin County Well Standards. This Work Plan was developed in preparation for construction activities at the site in accordance with Central Valley Regional Water Quality Control Board (CVRWQCB) letter dated 25 September 2020 (Appendix A). 2.0. PROCEDURES As required, a health and safety plan will be prepared in accordance with Occupational Safety and Health Guidance Manual for Hazardous Waste Site Activities (National Institute for Occupational Safety and Health Administration, U.S. Coast Guard and U.S. Environmental Protection Agency, 1985). Prior to drilling activities, each proposed drilling location will be clearly marked, and utility clearance obtained through Underground Service Alert. Well abandonment/destruction permits will be obtained from the San Joaquin County Environmental Health Department (EHD); additionally, the EHD will be notified a minimum of 48-hours prior to commencement of well destruction activities. Prior to well destruction activities, all wells will be checked for total depth and well integrity using a Solinst water level meter. Any obstructions found in the wells will be removed. AGI proposes to destroy wells MW-23, IW-1, and IW-2 by over-drilling. The wells will be drilled-out to the total depth of the wells utilizing a hollow-stem auger drill rig equipped with 8.25-inch diameter augers. All original well construction materials will be removed (including well casing, screen, filter pack, and annular seal) by the drill rig to ensure that no residual contamination is sealed within the abandoned borehole and a vertical conduit does not remain. The borings will be completely backfilled to surface grade with a cement grout mixture (Portland type II) and finished at the surface with native soil or concrete to match the existing surface. The grout mixture will consist of a ratio of not more than six gallons of water for every 94-pound sack of Portland type II cement. The drill rig hollow