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' 06 November 2002 <br /> . AGE-NC Project No 95-0137 <br /> Page 6 of 7 <br /> ' The fuel additive MTBE was detected by EPA Method 8260B in sample MW-3 at a concentration <br /> of 1 8 µg11 In addition, TBA was detected in sample MW-1 at a concentration of 23µg11, and the <br /> lead scavenger 1,2-DCA was detected in samples MW-1,MW-2 and MW-4 at concentrations of 26 <br /> ' µg11, 14µg11 and 230 µg11, respectively <br /> The analytical results are summarized in Tables 5 and 6 A copy of the laboratory report(MAI Lab <br /> ' ID Numbers 0209323-01 to 05),qualityas urance and quality control(QA/QC)report and chain-of- <br /> custody form are included in Appendixc <br /> Gd m1 Yq(0 <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> ' Based on the data collected from the site, AGE finds <br /> • Approximately 35 2 kg, 80 5 lbs or 12 4 gallons of hydrocarbons as gasoline were extracted <br /> ' and destroyed by the SVE network at the site between June and September 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 71 ppm <br /> • The ground water elevation decrease approximately 1 1 feet between June and <br /> t September 2002 The decrease In elevation of the ground water table has exposed additional <br /> impacted-soil to the SVE system <br /> • Dissolved hydrocarbon concentrations generally increasAver the previous two quarters,but <br /> ' remained well below the highest concentrations detected at the site <br /> • Benzene was detected wells MW-1 through MW-4 at concentrations of between 0 86 to <br /> ' 47 µg11, the benzene concentrations in MW-1, MW-3 and MW-4 are above the DHS's <br /> Maximum Contaminant Level (MCL) of 10 µg/1 In drinking water <br /> ' • Dissolved 1,2 DCA concentrations have remained stable, however, the concentrations are Y <br /> above the MCL of 0 5 µg/1 in drinking water <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 monitoring-well casing relative to an <br /> ' established benchmark <br /> • Performance of a quarterly ground water monitoring event in December 2002 concurrently <br /> ' with the Jlmco Truck Stop site <br /> Advanced GeoEnvironmental,Inc <br /> 1 <br />