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28 July 1999 <br /> . AGE-NC Project No 96-0263 <br /> Page 3 of 9 <br /> boring B3 to 5,400 yg/l of xylene in boring B 1 MTBE was the only oxygenated fuel additive <br /> detected in the water samples, and was detected in five of the seven samples analyzed at <br /> concentrations ranging from 65 ,ug/l to 11,000 µg/l Only the grab ground water samples collected <br /> from borings B7 and B9 did not contain detectable concentrations of MTBE <br /> Laboratory results of grab ground water samples analyzed for petroleum hydrocarbons and fuel <br /> additives are summarized in Tables 3 and 4 Figure 3 depicts the areal distribution of detected <br /> analytes in grab ground water samples <br /> Ground water at the site was encountered at a depth of approximately 10 feet bsg The lateral extent <br /> of the dissolved phase plume appears to have been delineated toward the south and west from the <br /> UST system The most intensely impacted ground water appears to underlie the former locations of <br /> the USTs and dispenser <br /> 3.0. REGIONAL GROUND WATER ELEVATION <br /> Information obtained from monitoring wells located at 2420 Grant Line Road and 2450 Toste Road <br /> indicate that groundwater depth at the site is between 8 and 10 feet bsg Ground water flow direction <br /> at the Grant Lane site is northerly, consistent with flow direction in the Tracy area <br /> 4.0. SCOPE OF WORK <br /> Based on analytical data from the initial site assessment of the site, the PHS-EHD has requested that <br /> an additional soil and ground water investigation be performed to define the lateral and vertical <br /> extent of the petroleum hydrocarbon contamination A significant hydrocarbon-impact to soil and <br /> ground water has been encountered in the area of the former dispenser island <br /> The proposed scope of work will include the following tasks <br /> • Permitting and pre-field work activities, <br /> • Soil sample collection and analysis, <br /> • Monitoring well installation and sampling, and <br /> • Report preparation <br /> Each of these tasks is described in greater detail below <br /> • <br /> Advanced GeoEnvironmental,Inc <br />