ARCHIVED REPORTS XR0009133 - Laserfiche WebLink

Home Browse Search

1 ' 04 November 2002 S AGE-NC Project No 97-0301 ' Page 3 of 5 i ' events The ground water elevation data obtained during the June 2002 ground water monitoring event is depicted in Figure 3 The inferred ground water flow direction for the area bound by wells MW-1 through MW-7 was inferred to be towards the east-northeast at a gradient of 0 002 ft/ft or less, or ' approximately 11 feet per mile (Figure 3) ' 3 2 LABORATORY RESULTS OF GROUND WATER SAMPLES A total of seven groundwater samples were submitted to McCampbell Analytical,Inc ,a DHS-certified ' laboratory, for analysis TPH-g was detected in water samples collected from wells MW-1 and MW-7 at concentrations of 17,000 micrograms per liter(µg11) and 67,000µg/1, the laboratory reported both samples as having significant unmodified or weakly modified gasoline TPH-d was detected in the ' water samples collected from MW-1 and MW-7 at concentrations as high as 2,800µg/l (MW-7), the laboratory reported the sam les from MW-1 and MW-7 as havingsignificant gasoline range compounds and the sample from W-5 as having sigmcant oi_ 1 range coounds TPH-k was detected in the ' water samples collected from MW-1 and MW-7 at concentrations as high as 8,200,ug/l (MW-7) BTEX compounds were detected in ground water samples collected from wells MW-1 and MW-7 at ' concentrations ranging as high as 12,000µg11 (benzene in MW-7) ' Utilizing EPA Method 8260M,MTBE was detected 1n water samples collected from wells MW-1 and MW-6 at concentrations of 14µg11 and 0 96,ugll, respectively, TBA was detected in a water sample collected from MW-1 at a concentration of 96 yg/l, EDB was detected in a water sample collected from well MW-1 at a concentration of 3 9µg/1, 1,2-DCA was detected in water samples collected from ' wells MW-1 and MW-7 at concentrations as high as 63Op g/l No other fuel components were detected during the laboratory analysis Previous and current analytical results of ground water monitoring well samples are summarized in Table 3 The laboratory reports(McCampbell Analytical Inc Lab I D 0206018-001 through 007)and ' chain-of-custody forms are presented in Appendix B ' 4 0 SUMMARY AND CONCLUSIONS The implications from the June 2002 ground water monitoring event are as follows ' • Groundwater flow direction for the area bound by wells MW-1 through MW-7 was inferred to be towards the east-northeast at a gradient of 0 002 ft/ft or less (Figure 3) Due to the low ' gradient at the site, slight vanations in ground water measurements or changes of recharge/discharge of the local ground water could greatly modify ground water flow direction Advanced GeoE nvi ronmental,Inc 1