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4.2.1 Soil <br /> L <br /> TPH-D, TPH-G, BTEX and phenols were not detected at or above the laboratory method <br /> Lreporting limit (MRL) in the soil samples analyzed. <br /> LMetals are naturally occurring components in soil, consequently, their concentration in soil is <br /> best evaluated in comparison to typical levels found in unaffected soil. Thus, individual <br /> sample results were compared to background arithmetic mean values developed for soil of <br /> the United States.' <br /> L <br /> This comparison indicates that all metal results are below the referenced mean background <br /> levels, with the exception of sample SB-02 collected at 15 feet bgs. This sample contained <br /> cobalt and zinc (9.6 and 70.6 milligrams per kilogram [mg/kg], respectively), at <br /> concentrations slightly above mean background levels (9 and 65 mg/kg, respectively). These <br /> L levels are, however, well within the background ranges typically observed for these metals <br /> (<3 to 50 mg/kg, and 10 to 2,100 mg/kg, for cobalt and zinc, respectively).' <br /> LAdditionally, metal results were compared to the health-based U.S EPA Region IX <br /> Residential Preliminary Remediation Goals (U.S. EPA Region IX Preliminary Remediation <br /> Goals [PRGs], September 1, 1995). As shown in Table 1, all metal concentrations were well <br /> Lbelow their respective PRG, with the exception of beryllium, which was detected at 0.42 <br /> mg/kg which is slightly above its PRG of 0.14 mg/kg. Again, this concentration is below <br /> the referenced mean background level developed for this metal (0.97 mg/kg). <br /> L <br /> L <br /> 1. Shacklette and Boetngen, 1984.Element Concentration in Soils and Other Surficial Materials of the Conterminous United States:U.S. <br /> Geological Survey Professional Paper 1270, Table 2. <br /> 809-001.rpd04-18-97/u/keydata/reports 1 1 <br /> TermNext <br />