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n , <br /> ' `30 November`2005 <br /> ? 'WAGE-NC <br /> Project N� 96"0235 <br /> =Page6of13' <br /> 2 53 <br /> Mori- <br /> ltor�rig Well Development and Prim <br /> h <br /> ary,Sam ling ' <br /> 14 '! 4 ] <br /> ^t <br /> r <br /> Between, 14'and 25 October 2005 'the ten ' F s <br /> 1 monrtorzng wells were,developed and-sampling ' <br /> r performed at the wells after°development' _p g oras <br /> ,I Is I a <br /> The monrtorin wells'were developed s <br /> ' ped utilizinga stainless steel hand bailer` and-an inertla,pump <br /> Ground water wds purged from each monitoring well until ground water was visually sediment free <br /> ApprI X1matelyll'1 and 180 gallons of water were're' oved from the,varrous wells MVV-16 throw` h <br /> MW-24 and EW-1F Ground _water temperature,,ply and conductivity were measured at g <br /> intervals durinpurgingusin an'Oakton water' regular" , <br /> =A g _ g analyzer Field sheets and data are included i <br /> r <br /> Appendix A Purged water was temporarily stared on-site Fn properly labeled,55-gallon Department T <br /> r of Transportation (DOT)-approved drums ' x' <br /> s r r i <br /> 3.0. FINDINGS <br /> ` <br /> i, <br /> The hydrocarbon-impact to ground water was'quantif ed by laboratory analysis of the ground water <br /> ' samples Ground water elevation and'gradient was`determined by utilizing data collected from the, <br /> t field <br /> _ 1 <br /> 311 GROUND WATER GRADIENT AND' <br /> FLOW DIRECTION ` <br /> s!r ' 'i ' ' S r <br /> ` Depths to ground water ranged from 15 58 feet to +19 84 feet below the tops of the'weli�casings, <br /> "ground water�vas'wrth g the screened intervals of the shallow wells, but was ap roximatl 1 <br /> to 22,feet above the screened interval of the exnterrnediate wells land,45 feet above the screened ~ TAY :II <br /> t ; intervals of,the deep wells <br /> The elevation`ofground water iri each well calculated by subtracting thetde th to z' <br /> p ground'w'ater n <br /> fro" Ithe surveyed casingelevations(Table 1);Ground water`elevations at the site ranged from'll 54 <br /> ., <br /> feet (MVV-12A) ta,'12 41 feet (MW-9) below m6n'sea level (MSL) ,in the first water table"elevations atthe site ranged from '11'7D'feet'(M, e and <br /> r w-6B)I�to 712 5S'feet (MVV!1) below MSL in the r r 1 <br /> deeper m°n2torzng wells'v►�th•screens below the uTater table The average ground water elevatyon at <br /> the site was approximately l2 OS feet belowrMSL' The average groundwater elevation in the wells <br /> } increased by approximately , <br /> roxjmatel ^1 1 feet since the June 2005`ground Lwater mon2torzng event 1 ' <br /> Figure 3 and Figure 4 illustrate the groundlwater,'Pctentioinetric surface based on the shallow- and' <br /> intermediate-screened data sets"Near the former LIST cluster, 1 <br /> f a , ground water flow direction at the ' <br /> shallow-screened data was,inferred,to be towardsi.the southwest at a gradient of 6 412 ft/fl "the <br /> n ' <br /> intermediate-screened data delineated aground water flow direction toward the north at a gradient , <br /> + r <br /> i ✓ s pp Y ! S I 1, ! � Z I ,{V ^ <br /> 1 <br /> r Advanced GeoEnvl�onIllenl8t,Inc o ' <br /> — <br /> r ,, <br />