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EDMUND G.BROWN JR. <br /> _! PPP GOVERNOR <br /> CALIFORNIA `� MATTHEW R RDRIOUEZ <br /> CRETARY <br /> WaterBoards ENVIRONMENTAL PROTECTION <br /> Central Valley Regional Water Quality Control Board <br /> 5 December 2018 <br /> Jeffrey D. Wingfield <br /> Port of Stockton California <br /> P.O. Box 2089 <br /> Stockton, California 95201 <br /> CENTRAL VALLEY WATER BOARD RESPONSE TO: DRAFT ADDENDUM TO DRAFT UST <br /> DATA GAP INVESTIGATION WORK PLAN, ROUGH AND READY ISLAND PORT OF <br /> STOCKTON, SAN JOAQUIN COUNTY, CALIFORNIA <br /> Dear Mr. Wingfield, <br /> California Central Valley Regional Water Quality Control Board (Central Valley Water Board) <br /> staff have reviewed the 9 November 2018 Draft Addendum to Draft UST Data Gap Investigation <br /> Work Plan (Addendum). Prepared by Geosyntec Consultants on behalf of the Port of Stockton <br /> (Port), the Addendum serves as a response to Central Valley Water Board comments to the 30 <br /> July 2018 Draft UST Data Gap Investigation Work Plan (Work Plan) and incorporates changes <br /> to the Work Plan to satisfy those comments. <br /> In response to Central Valley Water Board comments, the Port has agreed to add three soil <br /> samples to be tested for total petroleum hydrocarbons (TPH) and benzene at Underground <br /> Storage Tank (UST) Site 817B. However, the Port does not agree to collect groundwater <br /> samples from monitoring wells 917-3, 917-4, and 917-10 because these wells were tested as <br /> part of the June 2018 groundwater monitoring event. Instead, the Port recommends evaluating <br /> the June 2018 groundwater data in conjunction with the UST Site 817B soil data. The Port has <br /> also agreed to collect an additional grab groundwater sample UST Site 9168. <br /> Central Valley Water Board staff concur with the Addendum, responses to Central Valley Water <br /> Board comments, and changes to the original Work Plan. Central Valley Water Board staff also <br /> concur with the Port's proposal to evaluate June 2018 groundwater results in conjunction with <br /> the soil data that will be collected at UST Site 817B. <br /> If you have questions about this letter, please feel free to contact me by phone at (916) 464- <br /> 4636 or email at iohn.murphy a_waterboards.ca.gov. <br /> S\ONAL G <br /> Sincerely, o��� �o�o <br /> Q� JOHN T, O� <br /> MURPHY JR. cn <br /> o h n T. Murphy, P.4G—. #9524 NO 9524 <br /> Engineering Geologist <br /> DoD & Site Cleanup Program TF OF CAUF0 <br /> KARL E. LONGLEY SCD, P.E., CHAIR I PAT ULUPA, ESQ., EXECUTIVE OFFICER <br /> 11020 Sun Center Drive#200,Rancho Cordova,CA 95670 1 www.waterboards.ca.gov/centralvalley <br /> RECYCLED PAPER <br />