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September 16, 2020 Former Shell Service Station 434 East Dr. Martin Luther King Jr. Blvd. Page 2 Site has been historically occupied by two generations of service stations: a service station and automotive repair facility from at least 1930 through the 1940s; and the California-Charter Shell service station from approximately 1964 through 1982 (2017a). Underground storage tank (UST) closure and/or removal documents were not available for either of the historical service stations. Station layouts are shown on Figure 2. The Site was redeveloped in 1983 with a single-story commercial building and parking lot, occupied by Payless Shoe Source Store until 2017. Following building upgrades in 2019, the building is currently occupied by a dental office(Figure 2). PROPOSED SCOPE OF WORK In the letter dated August 31, 2020, the CVRWQCB granted the Site case closure and approved the abandonment of five groundwater monitoring wells associated with the Site. Well locations are shown on Figure 2. Well and boring details are shown on Table 1. Details of the proposed well destruction activities are presented in the following sections. PREFIELD ACTIVITIES Pre-field activities will include: • Creating a WPI Site Safety and Health Plan; • Scheduling subcontractors; • Notifying Underground Service Alert; • Performing an underground utility survey; and • Obtaining a San Joaquin County Environmental Health Division (SJCEHD) well destruction permit. Well MW-1 is proposed to be abandoned by pressure grouting due its location in the redeveloped landscape planter and proximity to irrigation lines. The well was installed in 2018 when the site was vacant and the landscape was in poor condition and not maintained. The site was redeveloped in 2019 and the landscape has been redone with subsurface irrigation lines. In addition,well MW-1 is outside the residual contaminant plume onsite. Soil and groundwater tables are attached. Neat cement will be mixed at a ratio of approximately 6 gallons of water to one 94-pound sack of cement and approximately 4 pounds of bentonite gel. Neat cement will be pumped into well MW-1 using a tremie pipe and once filled with grout, the tremie pipe will be removed. The well will be pressurized at approximately 25 psi for approximately five minutes to force additional grout into the sand pack surrounding the screened section and ensure that a seal is present within the well casing and the sand pack. For the protection of the seal, and to facilitate the future use of the land site, a hole at least one foot larger in diameter than the originally drilled hole shall be excavated around the outside of the well