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09 July 2002 <br /> AGE-NC Project No 99-0637 <br /> Page 3 of 4 <br /> MW6 at concentrations as high as 3,000 pg/1 (MW5) No other analytes were detected at or above <br /> laboratory reporting limits In the ground water samples <br /> The analytical results of ground water samples are summarized on Tables 2 and 3 The laboratory <br /> reports(MAI Lab IDs 0204326-001 A through 0204326-007A),QA/QC report and chain-of-custody <br /> form are Included in Appendix B <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> Based on the data collected from the site, AGE concludes <br /> • Ground water flow at the site on 18 April 2002 was Inferred to be generally toward the <br /> west-northwest at an average gradient of 0 001 feet/feet <br /> TPH-g was detected In the ground water samples collected from MW4 and MW5 at <br /> concentrations of 85 µg/1 and 300 pg/l, respectively MTBE was detected by EPA Method <br /> 8260 In the ground water samples collected from MW1, MW2, MW4, MW5 and MW6 at <br /> . concentrations as high as 3,000 gg/l (MW5) No other analytes were detected In the ground <br /> water samples collected at the site The lateral extent of MTBE-Impacted ground water has <br /> been defined toward the south, east and west The current MTBE Isoconcentration map Is <br /> depicted on Figure 4 <br /> 5.0. RECOMMENDATIONS <br /> Based on the findings of the environmental activities recounted In this report, AGE recommends <br /> • Continued quarterly monitoring of the ground water monitoring wells on-site The next <br /> monitoring event should be performed In August 2002 <br /> • Two additional monitoring wells be Installed north of well MWS to further assess the lateral <br /> extent of MTBE-Impacted ground water Proposed well locations are depleted on Figure 4 <br /> Advanced GeoEnvironmental,Inc <br /> I <br />