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VIZI iNC <br /> 40 6 0 LABORATORY ANALYSES <br /> Analyses for TPH, TPH-G and VOAs in soil and groundwater samples were conducted by <br /> Weston Analytical Laboratory of Stockton, California Weston Analytical Laboratory also <br /> conducted EDB analyses of groundwater samples collected from monitoring wells MW-1 , <br /> -3, -6 and the main water supply well McLaren Analytical Laboratory of Rancho Cordova, <br /> California conducted the analyses of water samples collected from the standby supply well <br /> for VOCs, EDB and total volatile hydrocarbons and analyzed additional water samples from <br /> the primary supply well for total volatile hydrocarbons <br /> 6.1 Soil Samples <br /> Soil sampling depths and analytical results from the McLaren site assessment soil borings <br /> and monitoring wells are presented in Table 4 These data have been previously provided <br /> 40 to PHSEHD by McLaren (1989a) Data presented within Table 4 indicate that toluene, <br /> xylene and ethylbenzene petroleum hydrocarbon constituents were detected in soil samples <br /> collected from MW-1, SB-2, SB-4 and SB-5 No other VOAs were reportedly detected in <br /> soil samples According to McLaren (1989a), concentrations of toluene and xylene in the <br /> soil were all considerably below designated levels to protect groundwater (100 mg/kg and <br /> 620 mg/kg, respectively) as established by the Regional Board in the 1989 "Designated <br /> Level Methodology" staff report (1989) However, ethylbenzene was detected in <br /> concentrations above the 29 mg/kg "designated level" in a single soil sample taken at a <br /> depth of 17 to 17 5 feet bgs from SB-2 <br /> Concentrations of total petroleum hydrocarbons as gasoline above 100 mg/kg were <br /> detected in soil samples collected from MW-1, SB-1, SB-2 It should be noted, however, <br /> that the laboratory detection limit used in the TPH-G analyses of the 40 5 to 41 0-foot soil <br /> samples from MW-1 and MW-2 was set at 250 mg/kg (McLaren, 1989a) Analytical results <br /> for these samples were not available until after sample holding times had been exceeded, <br /> consequently, the samples could not be resubmitted for analysis at a lower detection limit <br /> 19150011 005 20 <br />