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v A S S O C I A T E S I N C fuel additives although all sam les except SB had detectable concentrations of oxygenate g P elevated detection limits due to high concentrations of non-target compounds. Results of laboratory analyses performed on selected soil samples indicate that total lead, detected in all soil samples, is present beneath the site at concentrations ranging from 3 to 10 milligrams per kilogram (mg/kg). The analytical results for total lead were consistent with the typical U.S. Mean and typical Bay Area concentrations in soil as presented in Summary of Typical Metals Concentrations in Soils and Surficial Materials,from U.S.G.S. Professional Paper 1270 for the Conterminous United States. Analytical results of soil samples are summarized in Table 1. I 4.2 Groundwater Contamination Results of laboratory analyses performed on groundwater samples indicate that petroleum hydrocarbons are present in the groundwater beneath the site. Groundwater samples SBI-W and SB2-W contained detectable concentrations of BTEX, TPHg, and total lead. None of the groundwater samples contained detectable concentrations of oxygenate fuel additives although sample SB2-W had elevated detection limits due to high concentrations of non-target compounds. Analytical results of groundwater samples are summarized in Table 2. 5.0 RECOMMENDATIONS Analytical results for soil samples are generally consistent with field observations and PID readings. Based on the analytical results of the soil and field observations, the soil beneath the site appears to be impacted by petroleum hydrocarbons. Based on the analytical results of the groundwater samples, the groundwater beneath the site appears to be impacted by petroleum hydrocarbons. Additional investigation activities appear to be necessary to delineate the vertical and horizontal extent of petroleum hydrocarbon contamination in the soil and.groundwater. i wA14981\14981\-eports\p Woc 4 I