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17 October 2000 <br /> y <br /> AGF-NC Project No. 98-0450 <br /> Pagc 7 of 7 <br /> • The most intensely impacted soil appears to be in a silt layer under the former CAST arca at <br /> depths between approximately 20 to 35 feet bsg (VW-1 1). <br /> • The SVF network was installed within the highest petroleum hydrocarbon-impacted soil and <br /> ground water. Ongoing operation of' the SVE/IAS system should result in significant <br /> reductions of hydrocarbon-impact to soil and expectantly to ground water. <br /> • Hydrocarbons were detected in soil-vapor samples collected at the SVE unit at <br /> concentrations considered to be acceptable for successful on-going SVE remediation and the <br /> SVE unit operated over the entire quarter. A total of 1,070 gallons of gasoline were removed <br /> over the first two months of operation. <br /> 5.0. RECOMMENDATIONS <br /> Based on the findings of the environmental activities recounted in this report, AGE recommends: <br /> • Continued operation and monitoring of the soil vapor extraction and in-situ air-sparging. <br /> • Continued quarterly ground water monitoring of the existing well network. <br /> 6.0. 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 /> analytical results provided by an independent laboratory. Evaluation of the geologic conditions at <br /> the site for the purpose of this investigation was made from review of documents provided by the <br /> client to AGE, and a limited number ofavailable data points (soil-vapor samples) and subsurface <br /> conditions may vary away from these data points. No other warranty, expressed or implied, is made <br /> as to the professional recommendations contained in this report. <br /> Adrumeed GeuEnri-onmental.Inc. <br />