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r - r05 October 2006 • AGE-NC-99-0570 ' Page 2 of 4 2 2 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES r Ground water samples were collected from wells MW-1 through MW-5 using dedicated,disposable p g bailers Upon retrieval, the samples were Immediately transferred into three 40-milliliter (m1) ' Environmental Protection Agency (EPA)-approved volatile organic analysis (VOA) vials without a sample preservative, and into one 1-liter amber bottle without preservative ' At the request of the EHD,a ground water sample from the on-site domestic well (DW-1, Figure 2) was also collected and analyzed To ensure that formation water was being produced, water was allowed to run out of the well for approximately 20 minutes, long enough to automatically turn on the well pump Ground water was poured directly into the 40-m1 VOA vials and a 1-liter amber bottle from a valve at the well head All samples were properly labeled, stored in a chilled container, and transported under chain of custody to Cal Tech Environmental Laboratories (CTEL), a California Department of Health Services(DHS)-certified laboratory in Paramount,California Ground water samples were analyzed for the following constituents ' Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d, respectively) in accordance with EPA Method 8015M, and • Benzene,toluene, ethylbenzene, and total xylenes (BTEX) and oxygenated compounds di- isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), methyl tertiary-butyl ether (MTBE), tertiary-amyl methyl ether (TAME), tertiary-butyl alcohol (TBA), 1,2- ' dibromoethane(EDB),and 1,2-dichloroethane(1,2-DCA) in accordance with EPA Method 8260B Ile 1 - 3.0. FINDINGS ' Ground water elevation, flow direction, and gradient were determined from field data collected on 08 May 2006 Hydrocarbon impact to ground water was assessed by laboratory analysis of the ' ground water samples ' 3 1 GROUND WATER ELEVATION AND GRADIENT Depths to ground water ranged from 8 65 feet below the top of the well casing(btoc)in well MW-3 to 10 14 feet btoc In well MW-5 The relative ground water elevation ranged from 2 92 feet below mean seal level(MSL)in well MW-3 to 5 82 feet below MSL in well MW-5 During this monitoring . event, the top of the ground water table occurred within the screened intervals of the wells IU yn _ I z -3,--q -- 0/t/ 4 "-1 AdJneed GeoEnvnronmental,Inc 5e r94� l b-ab