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BTEX and TPHg concentrations in groundwater samples collected from <br /> upgradient monitoring wells MW-1 and MW-3 were either relatively low or <br /> not detected BTEX and TPHg concentrations in the groundwater samples <br /> collected from MW-4 and PH-8, which are located about 60 feet and 125 feet <br /> directly downgradient from the former UST, were also relatively low or not <br /> detected <br /> BTEX and TPHg concentrations were detected in the "grab" samples <br /> collected at the PH-6 and PH-7 locations BTEX and TPHg concentrations in <br /> the PH-6 sample were measured at 210 ug/l, 15 ug/1, 28 ug/l, 18 ug/l, and <br /> 1,000 ug/l, respectively BTEX and TPHg concentrations in the PH-7 sample <br /> were measured at 51 ug/l, 27 ug/l, 110 ug/l, 130 ug/l, and 4,900 ug/l, <br /> respectively These PH-6 and PH-7 sample results are considered suspect <br /> since petroleum concentrations were much lower or non-detect in the MW-4 <br /> sample, which is closer and directly downgradient relative to the former Site <br /> UST PSC suggests that the petroleum hydrocarbon concentrations detected in <br /> the PH-6 and PH-7 samples may be a result of previous retail gasoline <br /> operations at the 1725 El Dorado Street location <br /> Oxygenate compounds DIPE, ETBE and TAME were not detected in <br /> groundwater samples collected in March of 2002 TBA was detected in this <br /> latest round of sampling in the PH-6 sample at 3 8 ug/1 TBA and MTBE were <br /> detected in this latest round of sampling in the PH-8 sample at 4 1 ug/l and <br /> 28 ug/l, respectively Concentrations of TBA,MTBE and DIPE compounds <br /> have been historically measured in MW-2 groundwater samples <br /> r <br /> 13 <br /> March 2002 <br /> Subsurface Site Investigation <br /> 1717 South Center Street-Stockton California <br /> Prepared by Philip Services Corp <br /> H 1ENV1624001321121382CG1Prole tslSiockCcnt\narch2002inve tigation doc May 14 2002 <br />