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GAVIN NEWSOM <br />GOVERNOR <br />Water Boards <br />A‹,'S JSEACRREEToABRYLUFMOERNFELD <br />ENVIRONMENTAL PROTECTION <br />Central Valley Regional Water Quality Control Board <br />21 May 2020 <br />Mr. Atir Chak <br />Mr. and Mrs. Mandeep and Rudy Singh <br />Phillips 66 Company 2652 Cornflower Street <br />390 Kilroy Airport Way — Suite 210 <br /> <br />Stockton, CA 95212 <br />Long Beach, CA 90806 <br />Request for Work Plan Addendum, Former Tosco/Unocal #05643 AKA #4409, <br />1502 North El Dorado Street, Stockton, San Joaquin County <br />Dear Mr. Chak, and Mr. and Mrs. Singh, <br />The former Tosco/Unocal #05643 AKA #4409 is located at 1502 North El Dorado Street <br />in Stockton (Site). On 13 May 2020, Central Valley Regional Water Quality Control <br />Board (Central Valley Water Board) staff and GHD (GHD) staff meet via teleconference <br />to discuss current Site conditions and the path to closure for the Site. <br />During the meeting, we agreed that GHD would install an additional B zone <br />groundwater monitoring well to the east-northeast of Site well MW-14, and a nested or <br />co-located B and Ozone well pair north of MW-13 and MW-14, along a transect <br />between the onsite release point and the down-gradient water supply well "well 10". <br />Please submit a Work Plan Addendum by 30 July 2020 presenting a scope of work for <br />installation of the three wells discussed during the 13 May 2020 meeting. <br />KARL E. LONGLEY ScD, P.E., CHAIR I PATRICK PULUPA, ESQ., EXECUTIVE OFFICER <br />11020 Sun Center Drive #200, Rancho Cordova, CA 95670 I www.waterboards.ca.govicentralvalley