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lie 02 August 2000 AGE-NC Project No. 95-0197 ' Page 3 of 4 ' BTEX compounds were detected in the samples at or above laboratory reporting limits. MTBE was only detected by EPA method 8260M in sample MW-3 at 1.8 4g/1. No other fuel oxygenates were detected in any of the ground water samples. ' The analytical results of quarterly ground water samples are summarized in Table 2. The laboratory report (McCampbell Analytical Inc. Lab I.D. No. 41400 through 41403) and chain-of-custody form ' is included in Appendix B. ' 4.0. SUMMARY AND CONCLUSIONS Based upon data collected during the June 2000 monitoring event, AGE concludes: Ground water flow at the site was toward the northeast which is consistent with the January 2000 monitoring event and regional trends. However, the calculated hydraulic gradient ' indicates that the ground water table is nearly flat (0.003 feet/feet). The ground water elevation has increased approximately 2.4 feet since the January 2000 sampling event. a TPH-g was detected for the first time since quarterly monitoring began in April 1999 in MW-3. In addition,TPH-d was detected in the samples collected from MW-2 and MW-3 for' the first time since the July 1999 sampling event. 1 4 Toluene and MTBE were detected in sample MW-3, however, the concentrations detected were only at trace levels (0.82 ,ug/1 of toluene and 1.8 ug/l of MTBE). 5.0. RECOMMENDATIONS ' Based upon the results of this investigation, AGE recommends: p ' o A work plan was submitted to PHS-EHD on 06 June 2000 for two additional soil probe borings at the site, northwest and southeast of the former southwest fuel dispenser island ' area, to delineate adsorbed phase petroleum hydrocarbon impact and northwest and west of MW-2 to define the lateral extent of dissolved MTBE. The work plan was approved on 31 July 2000. This work should be completed or incorporated with the next quarterly monitoring i ' event. The next quarterly monitoring event should be scheduled for September 2000. • Advanced GeoEnvironrnental,Inc.