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14 May 2004 <br /> .} AGE-NC Project No. 95-0137 <br /> Page 3 of 4 <br /> northwest at a hydraulic gradient of 0.0025 foot/foot at the former UST area, from well MW-2 to <br /> MW-1 (Figure 3); the overall gradient at the site was northwesterly. <br /> 3.2. ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> TPH-g, TPH-d and BTEX compounds were not detected in the ground water samples. The lead <br /> scavenger 1,2-DCA was detected in samples MW-1,MW-2 and MW-4 at concentrations of 6.4µg11, <br /> 9.1 µg/l and 54 µg/1, respectively. No additional contaminants of concern were detected in the <br /> analyzed samples. <br /> The analytical results are summarized in Tables 2 and 3. A copy of the laboratory report(CTEL Lab <br /> ID Numbers 214-04033191), quality assurance and quality control (QA/QC) report and chain-of- <br /> custody form are included in Appendix B. <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> Based on the data collected from the site, AGE finds: <br /> • The ground water depth remained stable between the fourth quarter 2003 and first monitoring <br /> event in 2004. <br /> • Dissolved hydrocarbon concentrations were generally below detection limits and remained <br /> well below the highest concentrations detected at the site. <br /> • Dissolved 1,2 DCA concentrations have remained stable and generally declining;however, <br /> the concentrations are still above the MCL of 0.5 µg11 in drinking water. , <br /> • The hydrocarbon impact to soil has been mitigated. buy 5}� It 1}.ttry <br /> 5.0, RECOMMENDATIONS <br /> Based on the findings of the remediation activities recounted in this report, AGE recommends: <br /> • Preparation of Closure Summary Report. <br /> Advanced GeoEnvironmental,Inc. <br />