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the Site, and soil and groundwater located approximately at the <br /> central portion of the Site contained detectable concentrations <br /> of total petroleum hydrocarbons (TPH) as gasoline (TPHg) , TPH as <br /> ' diesel (TPHd) , and TPH as motor oil (TPHo) Additionally, the <br /> water reportedly collected within the 550-gallon underground <br /> storage tank (UST) located at the eastern portion of the Site <br /> contained elevated concentrations of TPHg; TPHd, and benzene, <br /> toluene, ethylbenzene, and xylenes (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 /> ' ICES conducted a site investigation and installed three <br /> monitoring wells (MW-1, MW-2 , and MW-3 ) an December 1999 . Based <br /> on the laboratory analytical results , PID readings, and field <br /> observations collected during the investigation, at appeared that <br /> the soil and groundwater containing elevated concentrations of <br /> petroleum hydrocarbons was limited to approximately the central <br /> portion of the Site The groundwater samples collected from <br /> ' wells MW-2 and MW-3 contained non-detectable concentrations of <br /> TPHg, TPHd, BTEX, 1, 2-Dichloroethane (1, 2-DCA) , and 5 oxygenates ; <br /> 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 an the groundwater sample collected from well MW-1 <br /> The fourth round of groundwater monitoring was conducted by ICES <br /> an January 2001 Laboratory analytical results of the <br /> groundwater samples that were collected from wells MW-1, MW-2 , <br /> ' and MW-3 an December 1999, June 2000 , October 2000 , and January <br /> 2001 are presented in Table 1 <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 lithologac 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 /> 2 <br />