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Chevron U.S.A. April 29, 1994 page 2 SAMPLING PROTOCOL Soil samples were collected from the backhoe bucket by removing the top few inches of soil and pushing a clean, six-inch-long, two- inch-diameter brass sample tube into the soil until completely full. The ends of the tubes were covered with teflon tape or aluminum foil and then sealed with plastic end caps. The sample tubes were then labeled, entered on a Chain-of-Custody Form and placed in a cooler with ice and transported to Superior Precision Analytical, a State-certified analytical laboratory located in Martinez, California. Stockpile samples were collected by removing the top 16 to 18 inches of soil, then pushing a clean sample tube into the soil until the tube was completely full. The sample tubes were then sealed, labeled, and handled as described above. All excavated soils were stockpiled on site and sampled for characterization prior to onsite disposal. For these purposes, one soil-stockpile sample was collected for approximately every 12 112 cubic yards. Four samples were then composited into one at the laboratory for a representative analysis of approximately 50 cubic yards. The composited soil sample was designated SP-la-d. SAMPLE ANALYSES Soil samples collected from the former UST tank excavation and stockpiles were analyzed for Total Petroleum Hydrocarbons calculated as Gasoline (TPH-Gasoline) and Total Petroleum Hydrocarbons calculated as Diesel (TPH-Diesel) according to EPA Method 8015 (Modified), Benzene, Toluene, Ethylbenzene, and Xylenes according to EPA Method 8020, Halogenated Volatile Organics according to EPA Method 8010, and Total Lead according to EPA Method SW-846 6010. A copy of the analytical laboratory report and Chain-of-Custody form is presented in Appendix A. Analytical summaries for the UST overexcavation and stockpiled soil are presented in Table A. 9-1918