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, <br /> 30'06tober 2003 a <br /> AGE=NC Project No. 98-0440 <br /> Page 2.of 4 -� <br /> 2.2•` COLLECTIOIN'OF.GROUND WATER-SAMPLES <br /> A water sample was collected from each'purged_well using anew disposable plastic-bailer.: To' <br /> sample DW5157, a hose bib was opened ofi, water storage tank and samples were collected from <br /> the tank while the pump was operating to obtain a fresh water sample. All samples we're transferred <br /> into-one 1-liter,amber bottle without sample-preservative and into three 40-ml;.'volatile organic <br /> .analysis (VOA) vials-containing '0.5 ml 18% hydrochloric•acid'as a sample preservative.'After <br />'. collection; the samples were properly labeled,placed in'a chilled container'and'tr'anspori6d under <br /> chain-of-custody to McCalnpbell Analytical In6..(MAI)..:Each sample was analyzed for:' <br /> Total petioleum.-h drocarbons .quanti,fied as gasoline' and diesefTPH-g and TPH-d, <br /> respectively) by EPA Method 8015M; and - <br /> Benzene,toluene,ethyl-benzene and xylene(BTEX)and methyl-tertiarybutyl ether(MTBE) <br /> by EPA,Method 8021'. <br /> 3.0. FINDINGS <br /> Ir " <br /> ,Ground water elevation, flow direction; and gradient were determined from field data-collected <br />' on18 September 2003. The hydrocarbon impact-to ground water was quantified by the laboratory <br /> analytical data. <br /> 3.1. ' GROUND WATER GRADMNT.AND'FLOW DI ECTI' <br /> Depths,to ground water ranged from 14.74 feet tol2.65 feet'below the well;casing tops:,Ground <br /> water elevations at the site ranged from 27.56-feet above mean sea level (MSL) in,well MW-8 to v ;' <br /> 28.41 feet above•MSL'iri well.MW-1. Ground'water elevations increased an averageof 1.50`feet " <br /> 'between the June 2003`and September 2003'moriitoring events.Ground water levels were within the <br /> screened intervals of all the inr'ohitoririg wells on-site: <br /> The'ground water!flow direction was inferred using groundwater elevation data'The ground water <br /> at the site on 18 September 2003 was inferred,to be flowingto'the north,under an average gradient' <br /> of,,0.005,feet/feet across"the area monitored.Figure 4 illustrates-the"ground water elevation contours. <br /> ! Advanced GeoEnvironmental,Inc. <br />