Laserfiche WebLink
06 February 2003 <br /> AGE-NC Project No 01-0827 <br /> Page 2 of 4 <br /> 2 2 GROUND WATER SAMPLE COLLECTION <br /> Water samples were collected from the monitored wells using new disposable bailers after allowing <br /> the wells to achieve a minimum 80% recovery of the pre-purge water volume Each sample was <br /> transferred into three 40-m1 EPA-approved volatile organic analysis (VOA) vials and one I-liter <br /> amber bottle Samples were stored in a chilled container and transported under chain-of-custody to <br /> Precision EnviroTech (PET) of Stockton, a DHS-certified analytical laboratory Each sample was <br /> analyzed for <br /> • TPH-g and TPH-d in accordance with EPA Method 8015 Modified, <br /> • BTEX compounds and fuel oxygenated compounds - tertiary butanol (TBA), d>-isopropyl <br /> ether (DIPE), ethyl tert butyl ether(ETBE), tert amyl methyl ether(TAME) and MTBE, in <br /> accordance with EPA Method 8260 Modified, and 1,2-Di chloro ethane (1,2-DCA) and <br /> ethylene dibrom>de (EDB) by EPA Method 8260 <br /> lie 3.0. FINDINGS <br /> Ground water flow direction and gradient were determined from the field data collected on <br /> 13 January 2003, the contaminant impact to ground water was assessed from the laboratory analysis <br /> of the ground water samples <br /> I3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> On 31 December 2002 and on 03 January 2003, depths to ground water in monitoring wells MW-1 <br /> and MW-5 and vapor wells VW-1, VW-2d, VW-3 and VW-5d ranged from 21 73 to 23 60 feet <br /> below the tops of the casings (btoc), the water table was approximately 10 feet above the screened <br /> intervals of wells VW-2d and VW-5d (Table 1) <br /> On 13 January 2003, depths to ground water in wells MW-1 through MW-5 ranged from 21 65 to <br />' 23 11 feet btoc(Table 1), the water table was at between 0 9 and 22 feet above the screened interval <br /> of the wells The ground water elevations at the site ranged from 11 55 feet (MW-5) to 12 19 feet <br /> (MW-2)below mean sea level(MSL) The ground water flow direction was inferred to be northeast <br />' at a gradient of approximately 0 006 ft/ft (Figure 3) <br /> IAdvanced GeoEnvrronmental,Inc <br /> I <br />