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�k fE it ,a Individual sample results were compared to background arithmetic mean values developed for 1 soils of the United States.' This comparison indicates that all metal concentrations are below ;their referenced mean ;j background level, with the exception of cobalt, copper, lead and nickel. These metal 11 concentrations, although above the referenced mean backgrund level in several samples, are however, well within the background ranges typically observed for these metals (Table 1). l l In addition, metal results were compared to the health-based U. Environmental Protection Agency (EPA) Region IX Residential Preliminary Remediation Goals (U.S. EPA Region IX Preliminary Remediation Goals [PRGs], September 1, 1995}. As!�shown in Table 1, all metal I� concentrations were well below their respective PRG, with the exception of beryllium (PRG of 0.14 mg/kg), which ranged from 0.28 to 0.61 mg/kg. Again, ',these concentrationsar e M below the mean background Ievel developed for this metal (0.97 mg/kg). 5.2.2 Ground Water h L� M Total Petroleum Hydrocarbons, Semivolatile Organic Compounds and Metals. TPH (diesel, gasoline or hydrocarbon mixtures) and SVOCs were not detected at or above their laboratory MRLs in the ground water samples analyzed. Of the 17 dissolved CAM metals analyzed, barium and molybdenum were the only dissolved metals detected 'above their respective MRL. As shown in Table 2, the detected concentrations of-!both of these metals were below their respective water quality goal. Volatile Organic Compounds. As shown on Table 2, toluene was! detected in one sample, just above the MRL, and well below the water quality goal 'established for this constituent. 1. Shacklette and Soerngen, 1984,Elemetu Concentrarion in Soils and Other Surficial Mater als of the Conterminous Unired States:U.S. Geological Survey Professional Paper 1270, Table 2. p ` 808MI.rpUO4-29-971u/keydata/repoM 18 �f Ip � lI iE