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1 <br /> a _ V <br /> CAMBRIA <br /> None of the soil samples contained detectable levels of benzene, toluene, or fuel oxygenates. <br /> Nine of the 14 soil samples did not contain detectable levels of TPHg, BTEX, and fuel ' <br /> oxygenates. Three of the soil samples contained only xylenes at concentrations ranging from <br /> 0.0159 to 0.0296 parts per million (ppm). The remaining two soil samples contained TPHg at <br /> concentrations of 4.59 and 54.7 ppm. <br /> Site Investigation 2001: Four soil borings (SB-1 t irough SB-4) were drilled at the site during <br /> July 2001 to assess the vertical and lateral exten of gasoline constituents in the soil and to <br /> determine if groundwater beneath the site was impacted. Soil analytical results from this <br /> investigation suggested the lateral extent of impacted soil is delineated and confined to the <br /> vicinity of boring SB-1. The groundwater sample collected from boring SB-1 contained ,780 <br /> parts per billion (ppb) TPHg and did not contain benzene or MTBE. The results of this <br /> investigation are documented in Cambria's November 7,2001 Site Investigation Report. <br /> Site Investigation 2002: During December 2002, five groundwater monitoring wells (MW-1 <br /> through MW-5) were installed at the site to monitor shallow groundwater. Soil samples <br /> collected from the well borings during this inves igation did not contain detectable levels of <br /> gasoline constituents. Groundwater samples collec ed from the wells did not contain detectable <br /> levels of TPHg or BTEX with the exception of low levels found in MW-l. MTBE was detected <br /> at 5.0 ppb in MW-2. 1,2-DCA was detected ir groundwater samples from three wells at <br /> concentrations ranging from 3.4 to 310 ppb. The sults of this investigation are documented in <br /> Cambria's May 2, 2003 Site Investigation/Quarterl Monitoring Report-First Quarter 2003. <br /> Groundwater Monitoring and Sampling: The five existing groundwater monitoring wells have <br /> been monitored and sampled quarterly since they w re installed. The groundwater flow direction <br /> beneath this site is generally toward the east, with fl actuation to the northeast and southeast. The <br /> groundwater gradient has ranged from 0.001 to 0.006. Depth to groundwater beneath the site <br /> ranges from approximately 41 to 44 feet below grad (fbg). <br /> WORK PLAN <br /> Technical Rationale for Proposed Scope of Work <br /> • 1,2-DCA has been detected in groundwater samples collected from wells MW-1, MW-2, and <br /> MW-5 at concentrations ranging from 2.3 to 310 ppb. <br /> 1511 2 <br />