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r , <br /> 115 January 2004 <br /> AOE-NC Project No. 98-0440' ''. ; <br /> IPage-2 of 4 <br /> 2:2. COLLECTION OF GROUND WATER SAMPLES <br /> A water sample was collected from.each purged well using-a new;disposable plastic bailer:. To <br /> sample DW5157,a hose'bib was operied on the water.storage'tank and samples were collected from' <br /> the tank while the pump was operating to obtain a fresh water`sample. All samples were transferred <br /> into one '1-liter amber bottle without.sample preservative and into three 40-m1 volatile. organic <br /> analysis (VOA) vials containing,0.5:ml 18% hydrochloric acid as a sarziple preservative. After <br /> collectiori, the..saniples were properly lab eled,,placed in' a chilled container and transported under <br /> chain-of,custody to IVIcCampbel1 Analytical Inc.'(MAI). Each sample was analyzed for: <br /> ' Total petroleum hydrocarbons quantified ,as gasoline and diesel'(TPH-g and.TPH=d; <br /> respectively)-by EPA,Metho;d 8015M;and <br />' Benzene,toluene,ethyl benzene and xylene(BTEX)and methyl-tertiary butyl ether°(MTBE) <br /> "by EPA Method 8021. <br /> ;3:0. FINDINGS <br /> Ground water.elevation, flow direction, and gradient were detcrmined from field data.collected.on <br /> 17,December, 2003."The hydrocarbon impact 'to ground water,was quantified by the.laboratory <br />' analytical data. - <br /> 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> Depths'to ground water ranged-from 13`:95:feet to14.62'feet below the well casing tops.,`Groundr <br /> ' water,6evations at the`,.site ranged from 25 5 E� .eet above mean sea level (MSL) in''well MW=$ fo <br /> 26:45'feet above MSL in well MW'L:Ground water levels were within,the screened intervals'of•all <br />' 'the monitoringwells,on-site <br /> The grouno.water flow`dzrection was inferred,using groundwater elevation data: THe ground water' <br /> at the site on' 17 December,2003 was inferredAto be flowing,to the north under an average gradient <br /> , <br /> and wait&elevation contours. - <br /> • of0:005 feet/feet across the.area monitored.Figure 4 illustrates the gro , <br /> Advaneed GeoEnvironmental,Inc. <br /> i <br />