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� ' I <br /> Y <br />' 08 November 2005 <br /> AGE-NC-99-0570 <br />' Page 2 of 4 <br />' 2 2 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES <br /> Ground water samples were collected from wells MW-I through MW-5 using dedicated,disposable <br />' plastic bailers Immediately upon retrieval, samples were 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, which was long enough to <br /> automatically turn on the well pump Ground water was poured directly into the 40-m1 VOA vials <br />' and a 1-liter amber 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 /> 28 April 2005, hydrocarbon impact to ground water was assessed by laboratory analysis of the <br /> ground water samples <br />' u4 <br /> 3 1 GROUND WATER ELEVATION AND GRADIENT AIS` <br /> 19 <br /> q�' `j3 <br /> The depth to ground water ranged from 134 feet below well casing grade in well MW;1' to <br /> 14 35 feet below well casing grade in well MW-5 (Table 1) The relative ground water elevation <br /> . ganged from 7 20 feet (MW-3) to 10 03 feet (MW-5) below mean sea level (MSL) During this <br /> IAdvanced GeoEnvironmental,Inc <br />