ARCHIVED REPORTS_REMEDIAL INVESTIGATION REPORT 2000

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07 February 2000 AGE-NC Project No. 95-0143 Page 4 of 5 in order to achieve even minimal flow from these wells. Organic vapor was measured at concentrations as high as 1,329 ppm in the extracted air stream (VW5). Due to the limited operational period during the current quarter,calculations for the mass of gasoline removed are not included in this report. However,preliminary calculations indicate a removal rate of approximately 5.6 gallons of gasoline per day. Calculations for the total mass of hydrocarbons removed will be included in the quarterly report for February 2000. 4.0. SUMMARY/CONCLUSIONS Based upon data collected from the site, AGE concludes: • Ground water elevation decreased approximately one foot between August and November 1999. The inferred ground water flow direction remains towards the north to northeast at the site. • Petroleum hydrocarbon concentrations increased in MW-3 and MW-6, remaining within historic concentrations. Hydrocarbon concentrations decreased in wells MW-7 and MW-9. Hydrocarbon were not detected in samples collected from wells MW-10, MW-14, MW-15, MW-16 and MW-17. Measurable free product was not encountered during the November 1999 monitoring event. • Operation of the SVE and IAS units was initiated on 03 November 1999. The SVE units extracts approximately 278 cfin with an LEL of 5 to 6 percent. The sparging system supplies approximately 20 cfh of air to each sparging well. 5.0. RECOMMENDATIONS Based upon data collected during the August 1999 and previous sampling events,AGE recommends: • Continued quarterly monitoring of the monitoring well system on the site. The next quarterly monitoring will be scheduled for February 2000,concurrent with monitoring at the Madison site. • Continued operation and monitoring of the SVE and IAS systems at the site. Advanced GeoEnvironmental,Inc.