ARCHIVED REPORTS XR0009170 - Laserfiche WebLink

Home Browse Search

' 31 May 2000 • AGE-NC Project No 97-0301 ' Page 3 of 4 I ' 2000 ground water monitoring event is depicted in Figure 3 Ground water flow direction for the area bound by wells MW-1, MW-2, MW-3 and MW-4 was generally toward the north-northwest at a gradient of 0 002 ft/fl, or approximately 11 feet per mile (Figure 3) 3 2 LABORATORY RESULTS OF MONITORING WELL GROUND WATER SAMPLES 1I A total of four ground water samples were submitted to a DHS-certified laboratory in March 2000 TPH-g was detected in water samples collected from wells MW-1 and MW-2 at concentrations of ' 27,000 nucrograms per liter(µg11) and 86µg11, respectivley, TPH-d was detected in water samples collected from wells MW-1,MW-3 and MW-4 at concentrations ranging up to 2,900 gg/l,however, the laboratory reported that the diesel chromatograms from MW-1 lacked typical diesel characteristics BTEX compounds were detected in the ground water samples collected from well MW-1 at concentrations ranging as high as 3,600 go Benzene was detected in the water samples collected from wells MW-1 and MW-4 at concentrations of 1,600µg11 and 2 4 gg/l, respectively ,• MTBE was detected in the ground water sample collected from well MW-2 at a concentration of 0 51 gg/l TBA was detected for the first time in a ground water sample collected from MW-1 at a ' concentration of 81 gg/1 No other fuel oxygenates were detected in any other analyzed ground water samples above the respected laboratory reporting limits ' Analytical results of the ground water samples are summarized in Table 2 The laboratory reports (Castle Analytical Laboratories Reference No 2894 and McCampbell Analytical Inc I D No 33126 through 33129) and chain-of-custody forms are presented in Appendix B 1 ' 4.0. SUMMARY AND CONCLUSIONS The implications from the March 2000 ground water monitoring event are as follows ' Ground water flow direction at the site appeared to be oriented generally towards the north- northwest at a gradient of 0 002, due to the low gradient at the site, slight variations in ' ground water measurements or changes of recharge/discharge of the local ground water could greatly modify ground water flow direction The ground water elevation at the site was approximately four to five feet above the screen � intervals at wells MW-1, MW-2, MW-3 and MW-4 • • Ground water elevations increased at the site an average 4 27 feet from December 1999 to I , Advanced GeoEn\ironmental,Inc