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' petroleum hydrocarbons (TPH) as gasoline (TPHg) , TPH as diesel <br /> (TPHd) , and TPH as motor oil (TPHo) Additionally, the water <br />' reportedly collected within the 550-gallon UST located at the <br /> eastern portion of the Site contained elevated concentrations of <br /> TPHg, TPHd, and benzene, toluene, ethylbenzene, and xylenes <br /> (BTEX) <br />' Bamer Construction Company removed the abovementioned 550-gallon <br /> UST in September 1999 Soil samples collected beneath the UST <br />' and from the soil overlying the UST contained non-detectable <br /> concentrations of TPHg, BTEX, and methyl tertiary-butyl ether <br /> (MTBE) , and low to non-detectable concentrations of lead The <br />' soil sample collected beneath the pipeline located directly <br /> adjacent to and east of the UST contained non-detectable <br /> concentrations of BTEX, MTBE, and detectable concentrations of <br /> TPHg and lead <br /> 1 At the request of SJC-EHD, ICES conducted a site investigation <br /> and installed three monitoring wells (MW-1, MW-2 , and MW-3 ) in <br />' December 3999 Based on the laboratory analytical results , PID <br /> readings, and field observations collected during the <br /> investigation, it appeared that the soil and groundwater <br /> containing elevated concentrations of petroleum hydrocarbons was <br /> limited to approximately the central portion of the Site The <br /> groundwater samples collected from wells MW-2 and MW-3 contained <br /> non-detectable concentrations of TPHg, TPHd, BTEX, 1 , 2--DCA, and 5 <br />' oxygenates, and low concentrations of MTBE and lead Detectable <br /> concentrations of TPHd and lead, and non-detectable <br /> concentrations of TPHg, BTEX, MTBE, 1, 2-DCA, and 5 oxygenates <br />' were detected in the groundwater sample collected from well MW-1 <br /> Laboratory analytical results of the groundwater samples <br /> collected from MW-1 , MW-2 , and MW--3 are presented in Appendix B <br />' 4.0 SITE GEOLOGY <br /> Sediments underlying the Site consist predominantly of a brown to <br /> tan-brown clayey silt with a localized lens of tan to grayish-tan <br /> sandy silt based on the lithologic logs of borings that were <br />' previously drilled at the Site <br /> Previous depth-to-groundwater measurements conducted at the Site <br /> indicated that groundwater was approximately 16 feet bgs <br />' Mapping and analysis of the groundwater elevation data suggested <br /> that, the local groundwater gradient flowed in a northeasterly <br /> direction. <br /> 1 ' <br />' 2 <br /> 1 <br />