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i y �. 28 June 2004 AGE-NC Project No 01-0877 ' Page 2 of 4 i r ' (VOA)vials containing 0 5 ml 18%hydrochloric acid as a sample preservative and one 1-liter amber bottle without preservative After collection,the samples were properly labeled,placed in a chilled container and transported under chain-of-custody to Cal Tech Environmental Laboratory(CTEL) ' of'Paramount, a California Department of Health Services (DHS)- Environmental Laboratory ` Accreditation Program certified (92424) analytical laboratory,for analysis The samples were analyzed for ' Total petroleum hydrocarbons as gasoline(TPH-g),diesel(TPH-d)and motor oil (TPH-mo) In accordance with EPA Method 8015 Modified, ' Benzene, toluene, ethylbenzene and total xylenes (BTEX) and the volatile organic compounds methyl-tertiary-butyl ether(MTBE), tertiary butyl alcohol (TBA), di-isopropyl ether (RIPE), ethyl tertiary butyl ether (ETBE), tertiary amyl methyl ether (TAME), ' 1,2-dichloroethane (1,2-DCA) and 1,2-dibromoethane (EDB) in accordance with EPA Method 8260 2 3 PURGE WATER DISPOSAL pe On 13 January 2004 American Valley Waste Oil, Inc of Delhi, CA collected approximately 270 gallons of purge water from the site The purge water was transported under non-hazardous waste ' manifests to Seaport Environmental of Redwood City, CA an EPA-approved disposal facility Copies of the non-hazardous waste manifests can be found in Appendix C ' 3.0. FINDINGS ' Ground water flow direction, elevation, and gradient were determined from data collected in the field The hydrocarbon Impact to ground water was quantified by the laboratory data obtained from ' the ground water samples s r > 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION At the time of the January 2004 sampling event, depths to ground water ranged from 26 93 feet to 27 63 feet below the tops of the well casings The average ground water elevation at the site'was approximately 17 23 feet below MSL(Table 1) Ground water flow was Inferred to be towards the northeast under a gradient of approximately 0 003 foot/foot (Figure 3) During the January 2004 Imonitoring event, ground water level in the wells was at least seven feet below the top of the well . screen,Indicating that the wells were screened properly to yield representative groundwater samples IAdvanced GeoEnvironmental,Inc 4