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' 17 September 2004 <br /> . . .. AGE-NC Project No. 95-0137 <br /> ' Page 3 of 4 <br /> of the laboratory report(CTEL Project Number CT214-0407164),quality assurance/quality control <br /> ' (QA/QC) report, chain-of-custody form and documents confirming the upload of laboratory <br /> electronic deliverable format (EDF) files and depth to water measurements to GeoTracker are <br /> included in Appendix C. <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 second and third quarter events 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 DHS'Maximum Contaminant Level(MCL)of 0.5 µg11 . <br /> ' in drinking water. <br /> '• The hydrocarbon impact to soil has been mitigated. <br /> t5.0. RECOMMENDATIONS <br /> Based on the findings of the remediation activities recounted in this report and previous <br /> investigations, AGE recommends: <br /> As required by the EHD,through letter dated 14 September 2004,preparation of a work plan <br /> for the lateral assessment of the dissolved 1,2-DCA west of the site. <br /> • Continued quarterly ground water monitoring and performance of a soil vapor extraction <br /> rebound response analysis for the duration of one month. <br /> i <br /> 1 <br /> ' Advanced GeoEnvironmental,Inc. , <br />