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30 October 2002 <br /> 1 AGE-NC Project No 98-0492 <br /> Page 2of4 <br /> sample preservative and into one 1-liter amber bottle without sample preservative After collection, <br /> ' the samples were properly labeled, placed in a chilled container and transported under chain-of- <br /> custody to McCampbell Analytical,Inc (MAI),a California Department of Health Services(DHS)- <br /> certified analytical laboratory The samples were analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline and as diesel (TPH-g and TPH-d) in <br /> accordance with EPA Method 8015 Modified, <br /> • Benzene,toluene,ethylbenzene and total xylenes(BTEX)in accordance with EPA Method <br /> 8021B, and <br /> ' • Fuel additives, including, di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), <br /> methyl tertiary-butyl ether (MTBE), tertiary-amyl methyl ether (TAME), tertiary-butyl <br /> alcohol(TBA), 1,2-dichloroethane(1,2-DCA)and ethylene dibromide(EDB) in accordance <br /> ' with EPA Method 8260 Modified <br /> ' 3.0. FINDINGS <br /> i <br /> Ground water elevation, flow direction, and gradient were determined from field data collected on <br /> 07 August 2002,the contaminant impact to ground water was assessed from the laboratory analytical <br /> data obtained from the sampling event <br /> 3 1 GROUND WATER ELEVATION, GRADIENT AND FLOW DIRECTION <br /> At the time of the August 2002 sampling event, depths to ground water in wells MW 1, MW2 and <br /> ' MW3 ranged from 23 10 feet to 24 37 feet below the well heads Ground water elevations at the site <br /> ranged from 12 95 feet above mean sea level(MSL)in well MW2 to 13 08 feet above MSL in well <br /> MW 1 (Table 1) Ground water elevations at the site decreased an average 2 84 feet between the <br /> ' May 2002 and August 2002 sampling events <br /> The ground water flow direction was determined using ground water elevation data from the three <br /> monitoring wells on-site The flow direction was found to be toward the northwest with a hydraulic <br /> gradient of 0 002 feet/feet Figure 3 illustrates the contoured ground water elevations as measured <br /> on 07 August 2002 <br /> Advanced GeoEnvi ron mental,Inc <br /> r � <br />