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1 ti, <br /> 23 May 2006 , <br /> AGE-NC-99-0570 <br />' Page 2 of 4 <br /> 22 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES <br /> 1 <br /> Ground water samples were collected from wells MW-I through MW-5 using dedicated,disposable <br />' bailers Upon retrieval, the samples were immediately transferred Into three 40-milliliter (ml) <br /> Environmental Protection Agency(EPA)-approved volatile organic analysis(VOA)vials containing <br /> 0 5 ml 18% hydrochloric acid solution as a sample preservative, and into one 1-liter amber bottle <br />' without preservative <br /> At the request of the EHD, a ground water sample from the on-site domestic well(DW-1, Figure 2) <br />' was also collected and analyzed To ensure that formation water was being produced, water was <br /> allowed to run out of the well for approximately 20 minutes, long enough to automatically turn on <br /> the well pump Ground water was poured directly into the 40-m1 VOA vials and a 1-liter amber <br />' bottle from a valve at the well head <br /> All samples were properly labeled, stored in a chilled container, and transported under chain of <br />' custody to Cal Tech Environmental Laboratories (CTEL), a California Department of Health <br /> Services(DHS)-certified laboratory in Paramount,California Ground water samples were analyzed <br /> for the following constituents <br />' • Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d, <br />' respectively) in accordance with EPA Method 8015M, and <br /> • Benzene, toluene, ethylbenzene, and total xylenes (BTEX) and oxygenated compounds di- <br /> isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), methyl tertiary-butyl ether <br />' (MTBE), tertiary-amyl methyl ether (TAME), tertiary-butyl alcohol (TBA), 1,2- <br /> dibromoethane(EDB),and 1,2-dichloroethane (1,2-DCA) in accordance with EPA Method <br /> 8260B <br />' 3.0. FINDINGS <br /> Ground water elevation, flow direction, and gradient were determined from field data collected on <br /> 06 February 2006 Hydrocarbon impact to ground water was assessed by laboratory analysis of the <br /> ground water samples <br /> 3 1 `GROUND WATER ELEVATION AND GRADIENT <br /> Depths to ground water ranged from 12 55 feet below the top of the well casing(btoc)in well MW-3 <br /> to 13 97 feet btoc in well MW-5 The relative'ground water elevation ranged from 6 82 feet below <br /> mean seal level(MSL)in well MW-3 to 9 65 feet below MSL in well MW-5 During this monitoring <br /> Advanced GeoEnvironmental,Inc <br /> s <br /> I � , <br />