ARCHIVED REPORTS XR0001942 - Laserfiche WebLink

Home Browse Search

12 May 2000 AGE-NC Prod ect No 97-0312 Page 3 of 4 direction was inferred to be northeasterly at a gradient of 0 003 ft./ft The flow direction is similar ' to that inferred for previous monitoring events Figure 4 depicts the contours for March 2000 ' Static ground water was approximately 8 feet above the screened interval in UST-5, 13 feet above the screened interval of UST-6, 16 to 17 feet above the screened interval of UST-2,UST-3 and UST- 4, and approximately 36 feet above the screened interval in UST-1 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES ' TPH-d was detected in the water samples collected from UST-1 and UST-4 at concentrations of 440 r parts per-billion (ppb, reported as micrograms per liter) and 55 ppb, respectively TPH-g, TPH-d, ' benzene, and toluene were detected in the water sample collected from monitoring well UST-5 at concentrations of 240 ppb, 65 ppb, 17 ppb, and 0 51 ppb, respectively TPH-d was detected in the 20 May 2000 sample collected from the large domestic well However, TPH-d was not detected in ' the 05 April 2000 sample from this well Petroleum hydrocarbons were not detected in wells UST-2, UST-3, UST-6 or the small domestic well MTBE was detected in UST-1 at a concentration of 1 1 ppb Oxygenates were not detected in the water samples collected from wells UST-2 through UST-6 or the domestic wells 1,2-Dichloroethane ' (1,2-DCA)was detected in the samples collected from UST-5 and UST-6 at concentrations of 160 ppb and 2 9 ppb, respectively Other volatile organic compounds were not detected in ground water samples from the site The laboratory report(MAI sample Nos 33733 -33740 and 34513)and chain- of-custody forms are included in Appendix B Analytical results of water samples collected in March 2000 are summarized on Table 2 The analytical results of all water samples are summarized on Tables 3 1 4.0. DISCUSSION AND CONCLUSIONS Based upon data collected from the site, AGE concludes the following ' Ground water elevation increased approximately 8 41 feet at the site between the,December 1999 and March 2000 monitoring events The Inferred ground water flow direction continues to be northeasterly - _ ' TPH-g, TPH-d,benzene and toluene were detected in the water sample collected from UST- 5, TPH-d was detected in UST-1 and UST-4 Hydrocarbons were not detected In the water ' samples collected from UST-2, UST-3 or UST-6 • 1,2-DCA was detected in the samples collected from UST-5 and UST-6 at concentrations of Advanced GeoEnvironmental,Inc 1 J s