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17 August 2001 AGE-NC Project No 99-0637 ' Page 3 of 3 The analytical results of ground water samples are summarized on Table 2 The laboratory reports (MAI Lab I D No 72274 through 72277), QA/QC report and chain-of-custody form are included in Appendix B I 4.0. SUMMARY AND CONCLUSIONS Based on the data collected from the site, AGE finds • Ground water flow at the site on 11 July 2001 was inferred to be generally toward the west at a low gradient of 0 0005 feet/feet • MTBE was detected in the ground water sample collected from MW4 at a concentration of 12,000 µg/l (EPA Method 8260) No other analytes were detected in the ground water samples collected at the site The lateral extent of MTBE-impacted ground water has been I defined toward the northeast through southeast,but is not defined from north to west to south of MW4, located west of the former UST pit The current MTBE isocontour map is depicted on Figure 4 ' 5.0. RECOMMENDATIONS Based on the findings of the environmental activities recounted in this report, AGE recommends I • Quarterly monitoring of the ground water monitoring wells on-site The next monitoring event should be performed in October 2001 • Preparation of a work plan to define the lateral and vertical extent of MTBE-impacted soil ground water 6 0. LIMITATIONS Our professional services were performed using that degree of care and skill ordinarily exercised by environmental consultants practicing in this or similar localities The findings were based upon analytical results provided by an independent laboratory Evaluation ofthe hydrogeologic conditions at the site for the purpose of this investigation was made from a limited number of available data points(ground water samples) and subsurface conditions may vary away from these data points No Iother warranty, expressed or implied, is made as to the professional recommendations contained in this report Advanced GeoEnvironmentsl,Inc I