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' 28 April 1999 <br /> AGE-NC Project No 95-0137 <br /> Page 4 of 5 <br /> • The ground water monitoring wells on and off the site area representative of the water table <br /> for the shallow ground water at the site and provide representative sample of the current <br /> dissolved hydrocarbons in ground water at the site <br /> ' • The highest concentration dissolved hydrocarbons continues to be in the area of monitoring <br /> well MW-2 and soil vapor wells VW-1 and VW-2, south and southeast of well MW-2 <br /> • TPH-g concentrations detected in well MW-2 to date have been at a maximum of 14,000 <br /> µg/i Current TPH-g concentrations are at 92%of the maximum contaminant concentrations <br /> detected at the site However, the TPH-g concentrations are at 565 % of the lowest <br /> ' concentration of 230 ,ug/l <br /> • Detectable concentrations of TPH-g and TPH-d increased in the wells near the former UST <br /> ' area The highest concentrations of TPH-d was in the samples collected from monitoring <br /> well MW-3 and soil vapor well VW-1 <br /> ' • Benzene was detected at the greatest concentrations (1,500 µg11) since monitoring was <br /> initiated (MW-2) <br /> • TPH-g and xylene were detected in one of the well samples collected from the Jimco site <br /> Diesel-impacted ground water extends north and northeast of the former RFS UST area onto <br /> the Jimco Truck Stop property <br /> ' • MTBE was detected at low concentrations in samples from wells MW-1 and MW-3 <br /> • DIPE was detected at low concentrations in samples from wells MW-3, MW-4 and MW-8 <br /> ' • TBA was detected at low to moderate concentrations from wells MW-1, MW-3, MW-4 and <br /> MW-8 and vapor well VW-I A <br /> 5.0. RECOMMENDATIONS <br /> ' Based upon ground water data collected from the site, AGE recommends the following <br /> ' The PHS-EHD has indicated that soil and ground water remediation is necessary at the site <br /> and that a Corrective Action Plan (CAP) should be prepared The CAP should include a <br /> ' mmnnuin of three remediation feasibility studies (e g in-situ air sparging pilot test, soil <br /> vapor extraction and select bio-enumerations) to determine appropriate remedial options for <br /> the site Additionally, a ground water well survey for the site will be included in the CAP <br /> ' The next quarterly monitoring at the site should be scheduled for May 1999 <br /> Advanced GeoEn%kronmenial,Inc <br />