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' 'w•0 .4c -'r � r a er,„.a._ r` a'*'2 ,, s»4..;=r+ <br /> 1 <br /> 7 <br /> 30 January 2004 <br /> AGE-NC Protect No 00-0769 <br /> I i <br />' Page 2 of 7 " <br /> I � , <br /> t 2 2 COLLECTION,AND ANALYSIS OF GROUND WATER SAMPLES <br /> Ground water samples were collected from wells MW-1,MW-2A,MW-2B, -3A and MW-3B <br /> utilizing tiew, 2-inch�cliameter disposable polyethylene bailers Samples were collected from wells ` <br /> 'MW-4A through MW-9D utilizing 3/a-inch diameter polyethylene tubing The samples were ` <br /> transferred into 40-m1 EPA-approved volatile organic analysis (VOA)vials containing 0 5 ral 18% <br /> hydrochloric acid as a preservative Care was taken to ensure that visible air bubbles were not present ' <br />' in the vials after filling and capping The sample vials were then labeled with the monitoring well <br /> designation, date, time of sampling and the sampler's Initials Following collection, samples were <br /> placed in a chilled container and transported under chain-of-custody to Cal Tech Environmental, <br />' Laboratories (CTEL), a California Department of Health Services (DHS)-certified analytical <br /> , <br /> laboratory, and analyzed for <br /> • Total 1 petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA = ; <br /> Method 8015 Modified, and <br /> • VOCs,including benzene,toluene,ethylbenzene and xylenes(BTEX)and the fuel additives <br />' methyl,tertiary butyl ether (MTBE), di-isopropyl ether (DIPE), ethyl tertiary butyl ether <br /> (ETBE), tertiary amyl methyl ether (TAME), tertiary butyl alcohol (TBA), , 1,2 <br />'• dibromoethane(EDB) and 1,2-dichloroethane(1,2-DCA) in accordance with EPA Method <br /> x <br /> 8260B <br /> 3.0. FINDINGS f <br /> 1� j h J i <br /> Ground water elevation;flow direction and gradient were inferred from fiel1d data The hydrocarbon- <br /> impact to ground water was quantified by laborator,arialysis of ground water samples <br /> 1 <br /> I 1 til 1 <br /> !t ' <br /> 3 1 GROUND WATER ELEVATION AND GRADIENT ' <br /> Depth to ground water was between 25 02 feet (MW-8B) and 29 00 feet (MW-5E) below the tops <br /> of the well casings on 22 May 2003 Relative ground water elevations ranged from 14 32 feet(MW- <br />' 9C)to,18 25 feet(MW°7D)below mean sea level(MSL) The'ground water elevation data collected <br /> from the site and the adjacent Arc Pum, and Weld site were plotted for the informal HU,--I through <br /> HU-4 hydrogeologic flow units Ground water elevation,data is presented in Table 1 and contoured <br /> ` ground water elevation data is presented m IFigures 3-61 The elevation and gradient for each unit is <br /> described below <br /> 1 f <br /> I , <br /> I I 1 <br /> I <br /> Advanced GeoE� nviro1nmental,Inc <br /> 1 <br /> 7 i <br />