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, �. 25 Au4 r gust 2004 AGE-NC Project No. 95-0106 ' Page 2 of 4 . r Tfie samples were .transported iri"a "chilled container under .chain of custody to Cal Tech ' Environmental.Laboratories (CTEL), a California Department of Health Services (DHS)-certified analytical laboratory, and,analyzedfor: ' Total-'petroleum hydrocarbons .quantified as , gasoline ' (TPH-g) in accordance with EPA Method 8015-Modified and '' " "• '' (Benzene,toluene,.ethylbenzene and xylenes(BTEX); and the fuel additives methyl tertiary :butyl-ether(MTBE), tertiary butyl.alcohol,(TBA),"di=isopropyl ether(DIPE), ethyl tertiary- butyl ether(ETBE),and.tertiary-amyl methyl ether(TAME), 1,2-dibromoethane(EDB)and 1•,2-dichloroethane (1,27DCA) in accordance•with EPA Method 8260B. 2.3.., PURGE WATER DISPOSAL On 13 January 2004 America_n Valley-Waste Oil, Inc. of Delhi,-,.CA collected,approximately 90 ' . gallons of purge water from the site. The pure water was transported under non-hazardous waste .9 _ manifests to Seaport Environmental.of Redwood City, CA, an EPA-approved disposal facility. A ' copy of the non-hazardous waste manifest can be found in Appendix C. ' 3.0. FINDINGS Ground water'elevation and flow direction were inferred from field data. The'hydrocarbon impact ' to ground water was quantified by°laboratory analysis of the ground water-samples: ' '.GROUND WATER ELEVATION AND FLOW DIRECTION ' The'relative ground water elevation ranged from•32;94•feet (MW-6 upper) to 33.76 feet (MW-2); increasing an average of 0.29 feet since-the December 2003 monitoring event. The water table, appears as a northerly�plunging'ridge; the east limb'of'the`ridge flows toward the riorth0ast at a gradient.of approximately 0.006 foot/foot and the west'limb flows toward the northwest at a gradient of approximately 0.006 foot/foot. Ground water elevation-data is presented in Table 1 and the . contoured ground water elevation data is shown on Figure 3: Advanced GeoEnvironmental,.Inc.