ARCHIVED REPORTS XR0006447 - Laserfiche WebLink

Home Browse Search

30 October 2000 AGE-NC Project No. 95-0197 Page 3 of 4 ' 3.2. ANALYTICAL RESULTS OF GROUND WATER SAMPLES TPH-g and TPH-d, detected only in ground water sample MW-3, was present at concentrations of 330 ,ug/1 and 450 ,ug/l, respectively. BTEX compounds were not detected above laboratory reporting limits in the ground water samples. MTBE was detected by EPA method 8260M in sample MW-3 at 1.7 yg/l.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. 48682 through 48685) and chain-of-custody form are included in Appendix B. ' 4.0. SUMMARY AND CONCLUSIONS Based upon data collected during the September 2000 monitoring event, AGE concludes: Ground water flow at the site was toward the northeast which is consistent with the June 2000 monitoring event and regional trends. The calculated hydraulic gradient indicates that ' the ground water table is nearly flat (0.001 feet/feet). The ground water elevation has decreased approximately 1.17 feet since the June 2000 sampling event. ' o TPH-g concentrations increased from 260 µg/1 to 330 µg/1 in the ground water samplev collected from MW-3 since the June 2000 monitoring eent_ • TPH-d concentrations increased from 350 µg/1 to 450 ,ug/1 in the ground water sample ' collected from MW-3 since the June 2000 monitoring event. • MTBE was detected in sample MW-3, however, the concentrations detected were only at trace levels (1.8 ,ug/l of MTBE). 5.0. RECOMMENDATIONS Based upon the results of this investigation,AGE recommends this site be considered for closure due ' to the low to non detectable concentrations of contaminants in the soil and ground water underlying the site. 1 Advanced GeoEnvironmental,Inc.