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O ot# <br />OflU <br />Water Boards <br />EDMUND G. BROWN JR. <br />,LOVERNOR <br /><114b MATTHEW ROORIOUEE <br />%111;00 SECRETARY FOR <br />ENVIRONMENTAL PROTECTION <br />Central Valley Regional Water Quality Control Board <br />3 November 2016 <br />Dave Patten <br />Chevron EMC <br />6101 Bollinger Canyon Road, BR1X-5535 <br />San Ramon, CA 94583 <br />CHEVRON STATION #9-4054, 2103 COUNTRY CLUB BOULEVARD, STOCKTON, SAN JOAQUIN <br />COUNTY, CASE# 390089 <br />The Central Valley Regional Water Quality Control Board (Central Valley Water Board) staff reviewed the <br />Work Plan for Groundwater Investigation dated 26 October 2016 (Work Plan) prepared on your behalf by <br />Stantec Consulting Services Inc. (Stantec) for Chevron Station #9-4054 on Country Club Boulevard in <br />Stockton (Site). <br />Four groundwater zones have been investigated at the Site. The A Zone is represented by wells <br />screened 5 to 35 feet bgs; the B Zone by wells screened 39 to 51.5 feet bgs; the C Zone by wells screened <br />65 to 81.5 feet bgs; and the D Zone by wells screened 95 to 101 feet bgs. Hydrocarbon impacts are <br />mainly in the A and B zones, and to a lesser extent, the C zone. My letter dated 15 August 2016, noted <br />the need for delineation of the lateral extent of B zone groundwater pollution north of wells MW-12B and <br />MW-13B, and the lateral and vertical extent of groundwater pollution east of MW-6. <br />In the submitted Work Plan, AGE proposes the installation of three monitoring wells: (1) MW-17B to <br />delineate B zone pollution north of MW-12B and MW-13B, (2) MW-15 to delineate A zone pollution east of <br />MW-6, and (3) MW-16B to delineate B zone pollution west of MW-10. <br />I concur with the proposed scope of work provided that the following comments are incorporated: <br />1. Proposed well MW-15 will provide delineation of A zone groundwater pollution east of MW-6, but <br />will not provide vertical delineation of pollution in this vicinity. In order to provide vertical <br />delineation, please also install a B zone well in the vicinity of proposed MW-15. <br />If you have any questions or concerns regarding comments in this letter please call me at (916) 464-4615 <br />or contact me by email at alan.buehler@waterboards.ca.gov . <br />/s/ original copy signed by <br />Alan M. Buehler, P.G. <br />Engineering Geologist <br />cc: Sriram lyer, State Water Resources Control Board, UST Cleanup Fund, Sacramento <br />Nuel Henderson, San Joaquin County Environmental Health Department, Stockton <br />Justin Sobieraj, Arcadis US Inc., 100 Smith Ranch Road #329, San Rafael 94903 <br />Mark Springs, 3535 Windham Circle, Stockton 95209 <br />KARL E. LONGLEY ScD, P.E., CHAIR I PAMELA C. CREEDON P.E., BCEE, EXECUTIVE OFFICER <br />11020 Sun Center Dove #200, Rancho Cordova, CA 95670 I www.waterboards.ca .govicentralvalley <br />RECYCLED PAPER