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06 April 2012 <br /> AGE-NC Project No. 07-1587 <br /> Page 5 of 6 <br /> • TPH-g were detected in grab ground water samples from boring B6 with <br /> concentrations of 800 micrograms per liter (pg/1) and 110 pg/l, respectively. <br /> • TPH-d were not detected in grab ground water samples from borings. <br /> • Three BTEX compounds were detected in samples from borings: B6-W@26-30 2.2 <br /> pg/I ethylbenzene and 20.7 pg/I total xylenes; B8-W@61-65 2.8 pg/1 benzene. <br /> • VOCs were detected in the grab ground water samples from boring B6-W26-30 at <br /> low concentrations. <br /> • 1,2 -DCA was not detected in the grab ground water samples collected from <br /> borings. <br /> • No other target analytes were detected at or above laboratory detection limits in any <br /> of the soil samples analyzed from borings B7 and B8. <br /> Analytical results of ground water samples are summarized on Table 2. The known lateral <br /> distribution of total petroleum hydrocarbon-impacted ground water (grab samples and <br /> current ground water monitoring well data) is depicted in Figure 3. <br /> Laboratory reports (CTEL Project No. CT214-1202005 and 1202046), quality <br /> assurance/quality control (QA/QC) reports, and chain-of-custody forms are included in <br /> Appendix B. Laboratory electronic deliverable format(EDF)files was QA/QC checked and <br /> uploaded to the State Water Board GeoTracker site; confirmation numbers are <br /> 4797057390, 7486098527. <br /> 4.0. CONCLUSIONS <br /> Based upon the results of the sampling, AGE presents the following conclusions: <br /> • The lateral extent of hydrocarbon-impacted soil is'.,defined to the southwest by <br /> boring B7, the impacted soil is defined to the easTof the former UST area by <br /> boring B8 and the impacted soil is mostly defined to the northeast of the former UST <br /> area by boring B6 and the other borings or well samples. <br /> • The vertical extent of hydrocarbon-impacted soil is defined at the borings locations <br /> established in January and February 2012. <br /> • The lateral extent of hydrocarbon-impacted ground water within the upper <br /> water-table zone is defined to the east by boring B8 and southwest by boring B7, <br /> and is mostly defined to low concentrations at the location of boring B6. <br /> ��1�slt <br /> Advanced CeoEnvironmental,Inc. <br />