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' 3. SAMPLING AND ANALYSIS spy ' On 24 March 1992 soil samples were collected using an impact-driven core sampler and 2-inch by 6-inch brass tubes. A hand auger was used to advance a soil boring to about five feet below the sump. Soil sample SBI-0 was collected from soil at the concrete/soil interface, at the bottom of the concrete and the top of the native soil underlying the sump. A sample was then collected from the soil boring two feet (SBI-2) and five feet (SBI-5) below the sump. A sample of the concrete (CONC) was also collected in a brass liner. Prior to use, the brass tubes were cleaned ' with Alconox detergent and water and rinsed with deionized water. The core sampler was cleaned between sample intervals in the same manner as the brass tubes. The ends of each brass tube were covered with aluminum foil, and plastic caps were placed over the ends of the tube. Each sample was labeled with the site location, depth of the sample, date and time sampled, and the initials of the sampler. The labeled and sealed samples were placed in a ziplock plastic bag and placed in a cooler filled with ice. The samples were stored and transported in the cooler under chain of custody. Chain-of-custody documentation is provided in Appendix A. The samples were delivered to Sequoia Analytical laboratory of Concord, California, a state-certified laboratory. ' The concrete sample (CONC) and soil sample SBI-0 were analyzed for Total Recoverable Petroleum Hydrocarbons (TRPH) by EPA Method 418.1 and for volatile organic compounds 0. (VOCs) by EPA Method 8240. In accordance with ARCO protocols, if petroleum hydrocarbons or volatile organic compounds were detected in soil sample SB1-0, then that sample was to be ' reanalyzed for: • California Assessment Metals (CAM Metals) ' • Fish Bioassay (96 hour) • EPA Method 1010 (Ignitability) • EPA Method 8080 (PCBs) • Toxicity Characteristic Leaching Procedures (TCLP) (volatiles, metals, semivolatiles) 4. SUMMARY OF RESULTS Soil sample SB1-0 and the concrete sample were analyzed for TRPH and for VOCs. VOCs were not detected at concentrations greater than the method detection limits in either the concrete or soil sample. 'TRPH was found in both the concrete sample and soil sample SB 1-0'at iconcentrations of,I mg/kg and 400 mg/kg, respectively. ' Soil sample SB1-0 was reanalyzed for CAM metals, 96-hour fish bioassay, ignitability, PCBs, and TCLP (VOCs, semivolatiles, and metals) to determine if the sample was hazardous as defined by the Resource Conservation and Recovery Act (RCRA). No constituents at concentra- tions greater than the regulatory action limits were found in soil sample SB1-0. Table 1 ' 548(1)IR0I492M.2 2