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California Retonal Water Quality Cjntrol Board <br /> Central Valley Region e <br /> Steven T.Butler,Chair <br /> Winston H.Hickox Gray Davis <br /> Secretaryfor Sacramento Main Office Governor <br /> Environmental Internet Address: http://www.swrcb.ca.gov/—rwgcb5 <br /> Protection 3443 Routier Road,Suite A,Sacramento,California 95827-3003 <br /> Phone(916)255-3000•FAX(916)255-3015 <br /> 28 March 2001 <br /> Richard Powell <br /> Naval Facilities Engineering Command, West <br /> Environmental Compliance, Mail Code 6423 <br /> 900 Commodore Drive <br /> San Bruno, CA 94066-2402 <br /> FINAL BUILDINGS 508 AND 617 OIL WATER SEPARATOR REMEDIAL INVESTIGATION <br /> AND EVALUATION WORKPLAN, NAVAL COMPUTER AND TELECOMMUNICATIONS <br /> STATION, SAN DIEGO DETACHMENT, STOCKTON <br /> We have reviewed the Final Workplan for Buildings 508 and 617 Oil Water Separator Remedial <br /> Investigation and Evaluation report dated 31 January 2001 and associated Meeting Summary letter of <br /> 14 March 2001. Based on the review of recent geoprobe groundwater sampling results and discussion of <br /> proposed monitoring well locations, we concur that three wells should be installed to further delineate <br /> groundwater contamination at this site. <br /> Three wells will be installed—one upgradient, one downgradient, and another in the suspected source <br /> area. The well at the source area will have a dual-nest completion where a deeper zone will also be <br /> installed in addition to the 30-foot zone. Constituents of concern include: TPH-gasoline, TPH-diesel, <br /> SVOCs, BTEX and motor oil. Four quarters of samples will be taken to ensure that seasonal <br /> fluctuations are monitored. The Navy should submit a Final Report, which includes an evaluation of the <br /> compiled data and recommendations for remedial action, as applicable. <br /> If you have any questions, please contact John Russell at 916-255-3066. <br /> KIM A. SCHWAB <br /> Associate Engineering Geologist <br /> cc: San Joaquin County Environmental Health Department <br /> Brad Beeman/Gail Qatsha,NCTS, Stockton <br /> Terry Escarda, Region 1, DTSC <br /> Jay Jahangiri,Port of Stockton <br /> Jeff Morris/Tom Lae, CH2M Hill, 2485 Natomas Park Drive, <br /> Suite 600, Sacramento, CA 95833 <br /> KAS:NCTS OWS 508 WkPlan <br /> California Environmental Protection Agency <br /> �o Recycled Paper <br />