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20 February 2006 <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-1 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 /> Iwithout 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 quantifed as gasoline and diesel (TPH- <br /> 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 (DIPS), 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 />' 07 November 2005 Hydrocarbon impact to groundwater 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 14 09 feet below the top of the well casing(btoc)in well MW-3 <br /> to 15 45 feet btoc in well MW-5 The relative ground water elevation ranged from 8 36 feet below <br /> mean seal level (MSL) in well MW-3 to 11 13 feet below MSL in well MW-5 During this <br /> Advanced GeoEnvironmental,Inc <br /> I <br />