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• CaliforieRegional Water Quality Coftol Board <br /> Central Valley Region 04*s <br /> Katherine Hart,Chair <br /> 11020 Sun Center Drive.#200.Rancho Cordova.Cali forma 95670-6114 <br /> Matthew Rodriquez (916)464-3291 •FAX(916)4644645 Edmund G.Brown Jr. <br /> 5'mental PMhttp://www.waterboards.ca.gov/centralvalley Edmund G, <br /> Environmental Protection eF-KI F/m_ LLd��Y" <br /> SEP 30 2011 <br /> 28 September 2011 <br /> EiUViRONMEN'1L HEALTH <br /> PERMIT/SERVICES <br /> DESJC, M.BENSON <br /> Defense Distribution Depot San Joaquin <br /> P.O. Box 960001 <br /> Stockton, CA 95296 <br /> REVIEW OF DRAFT WORK PLAN FOR SAMPLING AT OU-2 TCE SITES P-1A, P-1 B, P-1 C, <br /> P-1G, P-2A, P-2B, AND P-4B, DEFENSE LOGISTICS AGENCY, DEFENSE DISTRIBUTION <br /> DEPOT SAN JOAQUIN—SHARPE SITE <br /> California Regional Water Quality Control Board, Central Valley Region (Central Valley Water <br /> Board) staff has reviewed the Draft Work Plan for Sampling at Operable Unit 2 TCE <br /> Sites P-1A, P-1B, P-1C, P-1G, P-2A, P-2B, and P-4B (Work Plan), dated 29 July 2011 and <br /> received on 1 August 2011. The Work Plan was prepared by URS Corporation on behalf of <br /> the Defense Logistics Agency Distribution San Joaquin, California (DLA) for the Defense <br /> Distribution Depot San Joaquin — Sharpe Site. <br /> The work objective stated in the Work Plan is to collect data at Operable Unit 2 trichloroethene <br /> (TCE) sites under land use controls (LUCs). Currently, the Record of Decision Basewide <br /> Remedy for the Sharpe Site, last amended in June 2011, limits the construction of buildings on <br /> these sites due to the potential for TCE vapor intrusion to indoor air. Soil vapor and shallow <br /> groundwater samples will be collected and sent to a laboratory for chemical analysis of TCE. <br /> The laboratory data will be used to evaluate risk to human health from TCE vapor intrusion to <br /> indoor air. The Work Plan indicates that the risk evaluations will provide one line of evidence <br /> to determine whether continued LDCs are necessary at each of the TCE sites. <br /> Central Valley Water Board staff has no objections to DLA implementing the Work Plan. <br /> However, staff believes that additional data, beyond that proposed in the Work Plan, may be <br /> necessary before DLA can demonstrate that LUCs are no longer required at the TCE sites. <br /> If you have any questions, please contact me at (916) 464-4675, or by email at <br /> jbrownell@waterboards.ca.gov. <br /> 1\ <br /> ?JAMES R. BROWNELL, P.G. <br /> '�0 <br /> Engineering Geologist <br /> Federal Facilities Unit <br /> California Environmental Protection Agency <br /> 0 Recycled Poper <br />