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08 June 2003 <br /> AGE-NC Project No.02-0961 <br /> Page 5 of 5 <br /> 4.3. HYDROCARBON-IMPACTED GROUND WATER_ <br /> A grab ground water sample was collected from each of the five soil borings on 11 and 12 March <br /> 2003 and were analyzed for the petroleum hydrocarbon products listed in Section 3.2. No target <br /> analytes were detected at or above laboratory detection limits in the samples analyzed. Analytical <br /> results from ground water samples are summarized in Table 2.The laboratory report(CTEL Project <br /> No. CT214-0303093), quality assurance and quality control (QA/QC)report and chain-of-custody <br /> forms are included in Appendix B. <br /> 5.0. SUMMARY AND CONCLUSIONS <br /> Based on the data collected from the site in this and the previous investigation, AGE finds: <br /> • Clay and silt occurred under most of the site, with the exception of an apparently laterally <br /> continuous coarse sand unit at between 25 feet and 30 feet bsg and thin, laterally <br /> 'y discontinuous sand layers at approximately 10 feet and 25 feet bsg at location B2. Ground <br /> water occurred at approximately 28 feet bsg during the March 2003 boring event. <br /> • No target analytes were detected at or above laboratory detection limits in either the soil or <br /> "grab" ground water samples analyzed_ This data_suggests that the initial hydrocarbon <br /> ' impacted soil detected during the piping and dispenser upgrades was minor in nature. The <br /> 4. clayey and silty nature of the soil has inhibited the migration of hydrocarbons through the <br /> vadose zone. <br /> 6.0. RECOMMENDATION <br /> y Based on the findings of the environmental activities recounted in this report and the non-detectable <br /> concentrations of all target analytes, AGE recommends that no further action be taken at the site. <br /> Iv <br /> 7.0. LIMITATIONS <br /> Our professional services were performed using that degree of care and skill ordinarily exercised by <br /> environmental consultants practicing in this or similar localities. The findings were based upon <br /> LW analytical results provided by an independent laboratory. Evaluation of the geologic/hydrologic <br /> conditions at the site for the purpose of this investigation was made from a limited number of <br /> available data points(soil and ground water samples)and subsurface conditions may vary away from <br /> L" these data points. No other warranty, expressed or implied, is made as to the professional <br /> interpretations, opinions and recommendations contained in this report. <br /> Advanced GeoEnvira n mental,Inc. <br /> V <br />