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r• Ali., <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> b <br /> Steven T. Butler,Chair <br /> Winston H. laickox - Gray Davis <br /> Sccretan for Sacramento Main Office _ PH r2, 59 Governor <br /> Environmental Internet Address: http://%\�\w.s\vrcb.ca.gov/—%\ I` t <br /> Protection 3443 Routier Road,Suite A,Sacramento,California 95827-3003 <br /> Phone(910)255-3000-FAX(416)255-3015 <br /> 3 March 2000 <br /> Mr. Brad Beeman <br /> Naval Computer and Telecommunications Station, <br /> San Diego Detachment Stockton <br /> 305 Fyffe Avenue <br /> Stockton. CA 95203-4920 <br /> FINAL REPORT, SITE INVESTIG.ATION AND REMOI AL OF SOILICONSTR UCTION DEBRIS <br /> PILES FROM SITE 19, PARCEL 150, NAVAL COMPUTER AND TELECOMMUNICATIONS <br /> STATION, SAN DIEGO DETACHMENT, STOCKTON <br /> The Final Report, Site Investigation and Removal of Soil/Construction Debris Piles from Site 19, Parcel <br /> 150, dated 17 February 2000, has been reviewed by the Board. Site 19 is composed of a variety of <br /> construction debris piles that have been segregated by removing and disposing of concrete, asphalt, <br /> vegetation, wood and metal piping. Nine soil stockpiles remain on site that require further analysis, as <br /> well as subsurface soil below stockpiles. Consolidated piles now include P-6, P-7, P-8/P-9/P-19 (top 2 <br /> feet), P-10, P-11, P-14, P-15, P-16/P-17, P-20/P-21. No soil was left in P-12 (debris pile), P-13 (debris <br /> pile), P-15 (railroad ties), and P-18 (debris pile). <br /> We have provided the following comments that should be addressed by the Navy in a subsequent <br /> document: <br /> 1. 1.1 Project Background. Based on September 1997 sampling, the following constituents were <br /> detected in the stockpiles prior to segregating the piles: SVOCs, DDT, DDD, DDE, PCBs and <br /> metals. Please provide a summary table showing the results of each sample and a map showing <br /> sample locations for each pile. <br /> 2. 2.5.1 Waste Profile Sampling. Because of elevated levels of DDT, DDD, and DDE in Piles P-16 <br /> and P-17, the Navy performed additional sampling in August of 1999. Table 2 depicts the results <br /> of this effort. Samples were compared to EPA R9 PRG-Residential values. These are not the <br /> appropriate values to use for comparison because of more applicable values that have been <br /> developed at the site. <br /> In 1997, the Navy developed Ambient Screening Levels for Pesticides for Ecological Risk <br /> Assessment purposes. These can be found on Table ES-3 of the Final Technical Memorandum <br /> Background Metal Concentrations and Ambient Pesticide Concentrations in Soil, NCS, Stockton, <br /> October 1997. According to data presented in Table 2, the majority of the samples exceed the <br /> Ambient Screening Levels for Pesticides. We recommend the Navy address this issue with the <br /> Department of Fish and Game and/or the Department of Toxics Substances Control. <br /> California Environmental Protection Agency <br /> �a� Recycled Paper <br />