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22 June 2004 <br /> AGE-NC Project No 95-0167 <br />' Page 2 of 4 <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 laboratory, and <br /> were analyzed for <br />' 0 Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> Method 8015 Modified, <br />' 0 Benzene, toluene, ethylbenzene and total xylenes (BTEX) and the fuel additives methyl- <br /> tertiary butyl ether (MTBE), di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETRE), <br /> tertiary-amyl methyl ether(TAME),tertiary butyl alcohol(TBA), 1,2-dibromoethane(EDB) <br />' and 1,2-dichloroethane (1,2-DCA) in accordance with EPA Method 8260B <br /> ' 23 PURGE WATER DISPOSAL <br /> t On 13 January and 03 April 2004 American Valley Waste Oil, Inc of Delhi, CA collected <br /> approximately 300 gallons of purge water from the site The purge water was transported under <br /> non-hazardous waste manifests to Seaport Environmental of Redwood City, CA an EPA-approved <br /> ' disposal facility Copies of the non-hazardous waste manifests can be found in Appendix C <br /> 3.0. FINDINGS <br /> Ground water flow direction, elevation, and gradient were determined from data collected in the <br /> field The hydrocarbon impact to ground water was quantified by the laboratory data obtained from <br /> the ground water samples <br />' 3 1 GROUND WATER ELEVATION AND GRADIENT <br /> rFor the March 2004 sampling event, depths to ground water ranged from 14 40 feet to 15 22 feet <br /> below the tops of the well casings Ground water elevations at the site ranged from 4 79 feet(MW-5) <br /> ' to 6 13 feet (MW-2) below mean sea level (MSL) Ground water was within the screened interval <br /> of MW-1 through MW-6 and had an average elevation increase of 162 feet since the last monitoring <br /> event <br />' - - The ground water flow direction was determined by plotting and contouring the ground water <br /> elevation data The shape of the water table at the time of the March 2004 monitoring event was in <br />' the form of a west-northwest-plunging trough Net flow of ground water at the site was determined <br /> to be to the west-northwest under an average gradient of 0 009 feet/feet Figure 3 illustrates the <br /> . contoured ground water elevations as measured in March 2004 <br /> Advanced GeoEnvironmental,Inc <br />