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1 <br />' 12 September 2002 <br /> S AGE-NC Project No 95-0137 <br /> Page 8 of 8 <br /> ' lead scavenger 1,2-DCA was detected 1n samples MW-1,MW-2 and MW-4 at concentrations of 15 <br /> µg/1, 44µg/1 and 300 µg/1, respectively <br /> The analytical results are summarized in Tables 5 and 6 A copy of the laboratory report(MAI Lab <br /> ID Numbers 90799 through 90803 and 0206330-001 to 005), quality assurance and quality control <br /> (QA/QC) report and chain-of-custody form are included in Appendix D <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> ' Based on the data collected from the site, AGE finds <br /> • The ground water elevation increase approximately 0 8 feet between December 2001 and <br /> February 2002 and decreased 1 1 feet between February and June 2002 The fluctuation of <br /> the ground water table exposed additional impacted-soil to the SVE system <br /> ' • Dissolved hydrocarbon concentrations generally decreased slightly or remained stable over <br /> the fast two quarters,yet remained well below the highest concentrations detected at the site <br /> ' Benzene was detected only in sample MW-2 during the first quarter,but was detected in two <br /> wells, one at low concentrations, during the second quarter However, dissolved 1,2 DCA <br /> concentrations have increased <br /> ' / J <br /> • Approximately 30 06 gallons or 87 2 kg of hydrocarbons as gasoline were extracted and , <br /> destroyed by the SVE network at the site between 13 December 2001 and 13 June 2002 <br /> ' • Extracted organic vapor concentrations measured with the OVM were low compared to the <br /> analytical results from the soil-vapor samples The highest concentration of organic vapor + <br /> measured with the OVM was 46 ppm <br /> ' 5.0. RECOMMENDATIONS <br /> Based on the findings of the remediation activities recounted in this report, AGE recommends <br /> ' • Properly survey the elevation at the top of each monrtonng-well casing relative to an <br /> established benchmark <br /> ' • Performance of a quarterly ground water monitoring event in September 2002 concurrently <br /> with the Jimco Truck Stop site <br /> ' • Continued operation of the soil vapor extraction and air-sparing network <br /> ' Advanced GeoEuviron mental,Inc <br /> 1 <br />