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July 29, 2021 <br />California Regional Water Quality Control Board <br />Central Valley Region <br />11020 Sun Center Drive, Suite 200 <br />Rancho Cordova, California 95670 <br />Attention: Ms. Vera Fischer <br />SUBJECT: DELINEATION ASSESSMENT WORK PLAN <br /> FORMER SHELL SERVICE STATION <br /> 2575 COUNTRY CLUB BOULEVARD (at Plymouth Road) <br /> STOCKTON, CALIFORNIA <br /> WPI PROJECT: 200423 <br /> PLANET ID: 10040213 <br />Dear Ms. Fischer: <br />In the letter dated June 7, 2021, the California Regional Water Quality Control Board – Central <br />Valley (CRWQCB-CV) requested submittal of a work plan to address vertical delineation west- <br />southwest of wells MW-8 and MW-15 at the former Shell service station (Site) located at 2575 <br />Country Club Boulevard in Stockton, California (Figure 1). Accordingly, WPI on behalf of <br />Equilon Enterprises LLC dba Shell Oil Products US (Equilon) has prepared the below scope of <br />work to address the vertical delineation data gap as a remaining impediment to closure identified <br />by the CRWQCB-CV. <br />PROPOSED SCOPE OF WORK <br />Three boring locations are proposed within sidewalk areas on the westerly side of Plymouth <br />Road and to the west-southwest of wells MW-8 and MW-15. Borings will be advanced to first <br />water and depth-discrete groundwater samples will be collected to confirm delineation down- to <br />cross-gradient of the Site. The depth to groundwater in the proposed borings is estimated to be