Laserfiche WebLink
' 28 October 2005 <br /> AGE-NC Project No 95-0141 <br /> Page 3 of 5 <br /> 3.0. FINDINGS <br /> t <br /> Ground water elevation, flow direction, and gradient were determined from field data collected on <br /> 05 May 2005 The contaminant impact to ground water was assessed from the laboratory analytical <br /> data collected on 05 May 2005 <br />' 3 1 GROUND WATER ELEVATION AND GRADIENT <br />' At the time of the May 2005 monitoring event, depths to ground water ranged from 18 52 feet to <br /> 19 69 feet below the tops of the well casings Ground water elevations at the site ranged from 8 76 <br /> feet below mean sea level (MSL) in well MW-12A to 9 66 feet below MSL in well MW-I IB <br />' (Table 1) <br /> Wells MW-5, MW-7, MW-8A through MW-12A and EX-1 were used to determine ground water <br /> flow direction and gradient for shallow ground water The shallow ground water was inferred to flow <br /> generally toward the northeast, at an average gradient of 0 004 foot per foot (ft/ft) However, this <br /> quarter's data shows a range of groundwater flow gradients occurring onsite,at rates between 0 001 <br /> I • ft/ft and 0 009 ft/ft Figure 3 illustrates the contoured shallow ground water elevations as measured <br /> on 05 May 2005 <br /> IWells MW-6 and MW-8B through MW-12B were used to determine ground water flow direction <br /> and gradient for the deep ground water zone The deep ground water was inferred to flow generally <br /> towards the southeast, at a gradient of 0 004 ft/ft Figure 4 illustrates the contoured deep ground <br /> water elevations as measured on 05 May 2005 <br /> 3 2 ANALYTICAL RESULTS FROM GROUND WATER SAMPLES <br /> The analytical results of the ground water samples were as follows <br /> • TPH-g was detected in ground water samples collected from wells MW-3, MW-5, MW-6, <br /> MW-8B,MW-11B and EX-1 at concentrations ranging from 300 micrograms per liter(µg/1) <br /> in MW-6 to 120,000 µg/1 in EX-1 <br /> • Various BTEX compounds were detected in samples MW-3, MW-5, MW-6, MW-8A, <br /> MW-8B,MW-9A, MW-9B, MW-11B, and EX-1 at concentrations as high as 7,000 µg/1 of <br /> benzene,27,000µg/I of toluene,3,600µg/I of ethylbenzene and 15,600µg/1 of xylenes from <br /> Iwell EX-1 <br /> Advanced GeoEnnronmental,Inc <br /> I <br />