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GAVIN NEWSOM <br /> ' 4 GOVERNOR <br /> C0.L1 0 <br /> 77 IA JARED SECRETAFy FOR <br /> NFELO <br /> Water Boards ENVIRONMENTAL PROTECTION <br /> Central Valley Regional Water Quality Control Board <br /> 6 June 2022 <br /> Mr. Jason Cashman <br /> Environmental Manager <br /> P.O. Box 2089 <br /> Stockton, CA 95201 <br /> jcashman@stocktonport.com <br /> RESPONSE LETTER: REVISED DRAFT INVESTIGATION WORK PLAN <br /> ADDENDUM- UST 817 B, PORT OF STOCKTON, ROUCH AND READY <br /> ISLAND <br /> California Central Valley Regional Water Quality Control Board (Central Valley Water <br /> Board) staff has reviewed the Revised Draft Investigation Work Plan Addendum — UST <br /> 817B (Work Plan) at Rough and Ready Island, Port of Stockton, Stockton, California <br /> dated 29 March 2022. The subject Work Plan recognizes Central Valley Water Board <br /> staff comments made on the previous version of the Work Plan, dated 30 September <br /> 2021. <br /> This letter is to acknowledge updates to the Work Plan. Central Valley Water Board <br /> staff have no further comment on the Work Plan but would like to clarify the following: <br /> 1) Central Valley Water Board staff will recognize non-detect and estimated (J- <br /> flagged) analytical values that are above respective San Francisco Bay Regional <br /> Water Quality Control Board Environmental Screening Levels (ESLs) as <br /> exceedances. It is advisable to make sure laboratory Method Detection Limits <br /> and Reporting Limits are equal to, or below, respective ESLs shown in Table 1. <br /> 2) The Work Plan does not detail procedures for backfilling the proposed boreholes. <br /> The forthcoming project report documenting the execution of this Work Plan will <br /> need to include borehole backfilling procedures. Borehole backfilling procedures <br /> will need to comply with San Joaquin County Environmental Health Department <br /> requirements. Furthermore, please ensure all necessary permits are obtained <br /> from San Joaquin County and coordinate for site inspections, as required by the <br /> County. <br /> 3) The comments in this letter will need to reflect in Appendix A of the final version <br /> of the Work Plan. <br /> MARK BRADFORD, CHAIR I PATRICK PULUPA, EsQ., EXECUTIVE OFFICER <br /> 11020 Sun Center Drive#200, Rancho Cordova, CA 95670 1 www.waterboards.ca.gov/centralvalley <br />