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. 09 June 2003 <br /> AGE NC Project No. 98-0440 <br /> Page 2 of 4 . <br /> COLLECTION:OE 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 opened on the•water storage <br /> ,tank and samples were collected from ` <br /> -the tank while the pump wasoperating to obtain a freshwater sample. Alt"samples were transferred <br /> into one 1-liter amber bottle without sample preservative and into three 40=m1"VOA vials containing <br /> 0.5mI 18%hydrochloric acid-as a sample preservative.After collection,the samples were properly <br /> labeled,.placed in a chilled container`and transported under chain-of-custody to MAI. Each sample, <br /> was analyzed for: . <br /> Total, petroleum..hydrocarbons quantified, as­gasoline and --diesel (TPH-g and TPH`-d,` <br /> respectively)by EPA Method-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 determined from field data collected on <br /> .22 March 2003.The hydrocarbon impact to•ground water was quantified by the laboratory analytical <br /> data. . <br /> ' •' 1 .. . 1,':a .. i . i .. F.: <br /> 3.1. GROUND WATER GRADIENT AND FLOW DIRECTION", <br /> Depths.to ground water.ranged",from 13.81,feet to 14.68.feet.below the-.well casing tops.. Ground <br /> water elevations.at the site ranged from 25.43,feet above mean sea level (MSL)-in well MW8 to <br /> 26.43 feet above MSL'in well MW L Ground water levels were within'the screened intervals of all <br /> the monitoring wells on-site. <br /> The ground water,flow,direction was inferred using ground water elevation data.,.The ground water <br /> ^ at the site 'on-22 March-2003 was inferred to be flowing,to the north under an average gradient of <br /> 0.007 feet/feet across the`area monitored:Figure 4 illustrates the groundwater elevation contours. <br /> 3:2. ;ANAL•YTICAL RESULTS OF GROUND WATER'SAMPLES <br /> TPH-g was detected.in the.water samples collected from monitoring:wells MW2,MW5,MW6 and <br /> MW8 'at concentrations'of 130 'p,g/l; .1,30 40, 280 gg/,1 and 140 µg/1, respectively. TPH-d was <br /> Advanced GeoEnvironmental,Inc. <br />