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3.7 COMPOSITE STOCKPILE SAMPLE <br /> 1 Soil excavated during tank removal activities was temporarily stockpiled onsite A composite <br /> sample (designated Composite 1) representing 12 discrete sample locations was collected from <br /> the stockpiled soil on November 26, 1990 Composite 1 was analyzed for the following <br /> • VOCs by EPA Method 8240 <br /> • Semivolatile organic compounds (SVOCs) by EPA Method 8270 <br /> • Organochlonne pesticides and PCBs by EPA Method 8080 <br /> • California Code of Regulations (CCR) metals <br /> • TPHd <br /> • Acute aquatic 96-hour LC50 toxicity <br /> The laboratory results are summarized in Table 3 A copy of the laboratory reports and <br /> Chain-of-Custody are included in Appendix C <br /> 2 VOCs, SVOCs, pesticides and PCBs were reportedly not detected in Composite 1 A <br /> concentration of 1,600 mg/kg of TPHd was reported Eight of the 17 metals were reported <br /> below laboratory detection limits The nine remaining metals (arsenic, barium, chromium, <br /> cobalt,copper, lead, nickel, vanadium and zinc) were reported at concentrations below the <br /> applicable hazardous criteria as specified in California Code of Regulations (CCR), Title 22, <br /> Article I l The acute 96-hour aquatic toxicity test reportedly yielded a 96-hour LC50 greater <br /> . than 750 mg/L <br /> 4,0 DISPOSITION OF EXCAVATED SOILS <br /> 1 An estimated 2,400 cubic yards of soil were excavated as part of tank closure activities at the <br /> Site Based on laboratory results for Stockpile 1, Stockpile 2, Stockpile 3 and Composite 1, <br /> the stockpiled soil was not considered hazardous based on federal or state criteria <br /> 2 Based on the presence of petroleum hydrocarbons in the stockpiled soil, beneficial reuse of <br /> the soil onsite as base material for the surfacing of a parking lot located at the west end of <br /> the radyard was proposed to Ms Diane Hinson of San Joaquin County in a letter entitled <br /> Beneficial Reuse of Excavated Soils dated December 5, 1990 A copy of the proposal letter <br /> is included in Appendix D Verbal approval for beneficial reuse of the soil was received on <br /> December 20, 1990, from Mr Jim Maughan of the California Regional Water Quality <br /> Control Board (RWQCB), Central Valley Region and Ms Diane Hinson of San Joaquin <br /> County <br /> 9 <br /> ENVIRONMENTAL SOLUTIONS <br />