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' 17 February 2003 • AGE-NC Project No 95-0137 ' Page 6 of 7 ' The fuel additives MTBE was detected In samples MW-2 and MW-3 at a concentration of 10 µg/1 and 2 2 µg/1, r spectively, TBA was detected In samples MW-1 and MW-2 at concentrations of 8 5 µg/1 and 2g/l, respectively, and DIPE was detected in sample MW-2 at a concentration of ' 0 55 pg/l In addition, the lead scavenger 1,2-DCA was detected in samples MW-1, MW-2 and MW-4 at concentrations of 15 ptg/l, 18pLg/l and 98 pg/l, respectively The analytical results are summarized In Tables 5 and 6 A copy of the Iaboratory report (MAI Lab ID Numbers 0301015-01 to 05),quality assurance and quality control(QA/QC)report and chain-of- custody hain-ofcustody form are included in Appendix D 4 0. SUMMARY AND CONCLUSIONS Based on the data collected from the site, AGE finds • ApproxlmateIy38 kg, 84 lbs or 13 3 gallons of hydrocarbons as gasoline were extracted and destroyed by the SVE network at the site between 19 September and 12 December 2002 , . • Extracted organic vapor concentrations measured with the OVM were low compared to the analytical results from the soil-vapor samples The highest concentration of organic vapor measured with the OVM was 55 ppm ' • The ground water depth decreased an average of 0 73 feet between the third and fourth quarter monitoring events, the decreased depth of the water table has exposed additional petroleum hydrocarbon-Impacted soil to the SVE system • Dissolved hydrocarbon concentrations generally decrease over the previous quarter, and remained well below the highest concentrations detected at the site • Dissolved 1,2 DCA concentrations have remained stable, however, the concentrations are above the MCL of 0 5 pg/l in drinking water 5.0. RECOMMENDATIONS ' Based on the findings of the remediation activities recounted in this report, AGE recommend � � 5 ' • Continued quarterly ground water monitoring, the next monitoring event is scheduled for March 2003 • Continued operation of the soil vapor extraction and air-sparing network Advaywed GeOEnvlrunmental,Inc