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FMS #24 Site Investigation Report <br />California Army National Guard <br />Table 3-1. (Continued) <br />Sample <br />Sample Depth <br />Concentration <br />Criteria Comparison <br />Number <br />(feet bgs) Analyte <br />Reported in mg/kg <br />(mg/kg) <br />B32 <br />Benzene <br />0.12 <br />0.64 <br />(cont'd) <br />Residential PRG <br />Residential PRG <br />Toluene <br />Toluene <br />0.37 <br />520 <br />Residential PRG <br />Ethylbenzene <br />Residential PRG <br />Ethylbenzene <br />1.1 <br />400 <br />Xylenes <br />3.2 270 <br />Residential PRG <br />Residential PRG <br />Xylenes <br />5 <br />270 <br />TBA <br /><0.02 (ND) — <br />Residential PRG <br />Notes: <br />Bold indicates contaminant concentration exceeds 100 mg/kg (the recommended Tri—Regional Board guideline for TPHG or <br />TPHD in soil). <br />Lead concentrations were compared to the California Modified PRG of 150 mg/kg. <br />Benzene concentrations were compared to the California Modified PRG of 0.64 mg/kg. <br />Ethylbenzene and Toluene concentrations were compared to the PRG number for sat (soil saturation). <br />Xylene concentrations were compared to the PRG number for nc (noncancer). <br />Contaminant concentrations reported less than reporting limits are considered non -detect (ND). <br />Sources: Versar, Inc., 2004 <br />EPA, 2004 <br />Regional Water Quality Control Board, 1990 <br />B-3 December 2007 <br />TAME <br />TBA <br />DIPE <br />EtBE <br />MtBE <br />Lead <br /><0.005 (ND) — <br /><0.02 (ND) — <br /><0.005 (ND) — <br /><0.005 (ND) — <br /><0.005 (ND) — <br />8 150 <br />Cal Mod Residential PRG <br />B32 <br />40 TPHG <br /><10 (ND) — <br />TPHD <br /><10 (ND) — <br />Benzene <br />0.24 0.64 <br />Residential PRG <br />Toluene <br />0.048 520 <br />Residential PRG <br />Ethylbenzene <br />1.1 400 <br />Residential PRG <br />Xylenes <br />3.2 270 <br />Residential PRG <br />TAME <br /><0.005 (ND) — <br />TBA <br /><0.02 (ND) — <br />DIPE <br /><0.005 (ND) — <br />EtBE <br /><0.005 (ND) — <br />MtBE <br /><0.005 (ND) — <br />Lead <br />10 150 <br />Cal Mod Residential PRG <br />bgs = <br />below ground surface <br />NS = not sampled <br />DIPE = <br />di—isopropyl ether <br />PRG = preliminary remedial goal <br />EPA = <br />U.S. Environmental Protection Agency <br />TAME = tert-amyl methyl ether <br />EtBE = <br />ethyl tert—butyl ether <br />TBA = tert-butyl alcohol <br />FMS = <br />Field Maintenance Shop <br />TP14D = total petroleum hydrocarbons as diesel <br />mg/kg = <br />milligrams per kilogram <br />TPHG = total petroleum hydrocarbons as gasoline <br />MtBE = <br />methyl tert—butyl ether <br />UST = underground storage tank <br />ND = <br />non—detect <br />Notes: <br />Bold indicates contaminant concentration exceeds 100 mg/kg (the recommended Tri—Regional Board guideline for TPHG or <br />TPHD in soil). <br />Lead concentrations were compared to the California Modified PRG of 150 mg/kg. <br />Benzene concentrations were compared to the California Modified PRG of 0.64 mg/kg. <br />Ethylbenzene and Toluene concentrations were compared to the PRG number for sat (soil saturation). <br />Xylene concentrations were compared to the PRG number for nc (noncancer). <br />Contaminant concentrations reported less than reporting limits are considered non -detect (ND). <br />Sources: Versar, Inc., 2004 <br />EPA, 2004 <br />Regional Water Quality Control Board, 1990 <br />B-3 December 2007 <br />