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  <br /> <br />Central Valley Regional Water Quality Control Board <br /> <br />12 January 2021 <br /> <br /> <br />James Kiernan <br />Chevron Environmental Management Company <br />6001 Bollinger Canyon Rd, C2101 <br />San Ramon, CA 94583 <br /> <br />RESPONSE TO WELL DESTRUCTION WORK PLAN, CHEVRON STATION #9-4054, <br />2103 COUNTRY CLUB BOULEVARD, STOCKTON, SAN JOAQUIN COUNTY, LUST <br />CASE #390089 <br /> <br />Central Valley Regional Water Quality Control Board (Central Valley Water Board) staff <br />reviewed the Work Plan for Well Destruction (Work Plan) dated 28 December 2020, <br />submitted on your behalf by Arcadis U.S. Inc. (Arcadis) for the Chevron Station #9-4054 <br />underground storage tank (UST) petroleum release case at 2103 Country Club Boulevard <br />in Stockton (Site). In the Work Plan, Arcadis proposes to destroy the 35 remaining Site <br />groundwater and soil gas monitoring wells, as summarized in Table 1 below. <br /> <br />Table 1 – Summary of Proposed Well Destructions <br />Wells Well Type No. of <br />Wells <br />Total Depth <br />Range Zone Destruction <br />Method <br />Destruction <br />Depth <br /> (ft bgs) (ft bgs) <br />SV-1 thru SV-5, <br />SV-7 thru SV-9 Soil Gas 8 7.5 Vadose Air-knife/ <br />Hand-Auger <br />Well Total <br />Depth <br />MW-1A, MW-2 <br />thru MW-12 <br />Groundwater <br />Monitoring 12 30 A Overdrill Well Total <br />Depth <br />MW-1B, MW-2B, <br />MW-4B, MW-9B, <br />MW-12B thru <br />MW-14B <br />Groundwater <br />Monitoring 7 49-51.5 B Overdrill Well Total <br />Depth <br />MW-1C, MW-2C, <br />MW-4C, MW-9C, <br />MW-12C <br />Groundwater <br />Monitoring 5 75-81.5 C Overdrill Well Total <br />Depth <br />MW-4D, MW-9D, <br />MW-12D <br />Groundwater <br />Monitoring 3 100-101 D Overdrill Well Total <br />Depth <br />ft bgs= feet below ground surface