ARCHIVED REPORTS_XR0006081 - Laserfiche WebLink

Home Browse Search

' 08 August 2005 • AGE-NC Project No 98-0534 ` ' Page 8of15 ' and 5 3 µg11, respectively ETBE was detected by EPA Method 8260 in the samples from well MW-6 at 4 2 µg/1 TBA was detected by EPA Method 8260 in the samples from well MW-4 at 21 gg/1 No other fuel oxygenates were detected in any of the samples Ground ' water elevations are summarized in Table 3, analytical results of ground water samples are summarized in Table 4 Results of the June 2002 ground water monitoring event were reported in Quarterly Report-2nd Quarter 2002, dated 03 August 2002,prepared by AGE • 02 October 2002-ground water levels were measured at MW-1 and MW-3 through MW-8 Ground water monitoring well MW-2 was not readily accessible or located during the ' sampling event Ground water levels ranged from 1191 to 13 46 feet below the tops of the well casings (top of the screened interval), ground water flow direction at the site was inferred to be relatively flat in the area of the former USTs, trending towards a steeper ' northwest-oriented depression at the northern portion of the site, in the area of well MW-4 The gradient ranged from essentially flat at the former UST area to 0 04 ft/ft at the northern edge of the site TPH-d was detected in the ground water samples collected from wells ' MW-4, MW-6 and MW-7 at concentrations of 140 gg/l, 130 gg/l and 60 gg/l, respectively TPH-g and BTEX compounds were not detected in the ground water samples analyzed MTBE was detected by EPA Method 8260 in the samples from wells MW-3,MW-4,MW-6, ' . MW-7 and MW-8 at concentrations of 10 µg/l, 16 µg/l, 140 gg/l, 0 77 µg/1 and 1 2 pg/l, respectively TBA was detected in sample MW-4 at 16 µg/1 No other fuel oxygenates were detected in the samples analyzed Ground water elevations are summarized in Table 3, analytical results of ground water samples are summarized in Table 4 Results of the October 2002 ground water monitoring event were reported in ' Quarterly Report- 4th Quarter 2002, dated 02 December 2002, prepared by AGE • 23 January 2003 -ground water levels were measured at MW-1 and MW-3 through MW-8 ' Ground water monitoring well MW-2 was not readily accessible during the sampling event Ground water levels averaged 8 5 feet below the tops of the well casings(above the screened interval) Aground water ridge was present in the area of the former USTs with groundwater ' flowing towards the northeast away from the former UST area, with a gradient of approximately 0 0063 ft/ft and towards the southwest away from the former UST area to 0 0052 ft/ft The ground water elevation of monitoring wells MW-4 and MW-5 appeared ' anomalously low and further the wells failed to recharge after purging, therefore the data from these wells was not used to map the ground water elevation TPH-d was not detected in the any of the,ground water samples TPH-g was detected in the ground water samples ' collected from wells MW4 and MW6 at concentrations of 160 µg/1 and 110' gg/l, respectively BTEX compounds were not detected in any of the ground water samples V41 MTBE was detected in samples MW4 and MW6 by EPA method 8021 B at 1rr'ug/1 and ' 13 ug/1 and were reconfirmed with EPA method 8260B at 19 ug/1 and 18 ug/l, respectively • No other fuel oxygenates were detected in any of the samples Ground water elevations are IAdvanced GeaEnvtronmental,Inc ,