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Woodward-Clyde Consuiiant:; r' 3.0 ANALYTICAL RESULTS Soil samples from the borings were analyzed by WCC Analytical Laboratory in Pleasant Hill, California for TPH by EPA Method 8015 and BTEX by EPA Method 8020. Groundwater samples were analyzed by NET Pacific Laboratories in Santa Rosa, California for TPH by EPA Method 5030 and purgeable aromatic hydrocarbons (BTEX) - by EPA Melhod 602. The analytical laboratories' reports are presented in Appendix B. Table 3 summarizes WCC's soil sample analytical results. Table 4 summarizes NET's water sample analytical results. 3.1 a4.Il;i As shown in Table 3, TPH and BTEX were detected In only two of the soil samples collected and analyzed from the site. One sample was obtained from a depth of 30-31, feet in monitoring well MW-7 and contained very low levels (<1 mg/kg) of BTEX. The second sample was also collected from well MW-7 at a depth of 55-56.5 feet and contained 20 mg/kg of TPH In the first analysis, but none In a replicate analysis of a sample split. 3.2 Groundwater As shown, in Table 4, groundwater samples obtained from wells MW-7, -8 and -9 contained both TPH and/or BTEX. Up to 3400 ug/I TPH, and 60, 80, and 170 ug/f BTX were detected in well MW-9. Similarly, up to 9900 ug/I TPH and 200, 5.1, 0.7 and 22 ug/I BTEX were detected in well NW-8. Up to 1.5 ug/l benzene was detected in well MW-7. No other hydrocarbons were detected in groundwater samples obtained from these wells at the site. i i l i g