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I <br /> I29 December 2000 <br /> AGE-NC Project No 95-0128 <br /> IPage 2 of 5 <br /> I gallon DOT-approved H-17 storage drums pending proper disposal Following purging, the depth <br /> to ground water was measured to ensure that a minimum of 80% well-volume recharge had been <br /> achieved prior to sampling <br /> 22 GROUND WATER SAMPLE COLLECTION <br /> IA water sample was collected from each well using a new, clean, disposable plastic bailer <br /> Immediately upon retrieval, samples were transferred into three 40-milliliter (ml) EPA-approved <br /> volatile organic analysis (VOA) vials containing 0 5 ml 18% hydrochloric acid as a sample <br /> preservative and into one I-liter amber battle without the preservative The samples were logged on <br /> a chain-of-custody form, stored in a chilled container and transported under chain-of-custody to <br /> McCampbell Analytical Inc (MAI), a California Department of Health Services (DHS)-certified <br /> laboratory The ground water samples were analyzed for <br /> I - Total petroleum hydrocarbons quantified as gasoline (TPH-g) and diesel (TPH-d) in <br /> accordance with EPA Method 8015 Modified, <br /> lie <br /> - Volatile aromatic hydrocarbons benzene, toluene, ethylbenzene and total xylenes (BTEX) <br /> in accordance with EPA Method 8020, and <br /> I - Oxygenated compounds d1-isopropyl ether(DIPE),ethyl tertiary-butyl ether(ETBE),methyl <br /> tertiary-butyl ether (MTBE), tertiary-amyl methyl ether (TAME), tertiary butanol (TBA), <br /> methanol, ethanol, ethylene dibromide (EDB) and 1,2-dichloroethane (1,2-DCA) in <br /> accordance with EPA Method 8260 <br /> I3.0. FINDINGS <br /> Ground water elevations were determined by subtracting the measured depths-to-water from the <br /> surveyed casing elevations Ground water flow directions were determined by contouring the water <br /> elevations on a scaled site plan (Figure 3) The impact of the unauthorized release on ground water <br /> was quantified by laboratory analysis of samples collected during the quarter <br /> I3 1 GROUND WATER ELEVATION AND GRADIENT <br /> The avarage grniintj crater PlPv4lt1vlY1 on 2a (lrtnber 2(1Q0 utas annrnvimatelxr 1 S feet lrox ver than the <br /> average ground water elevation during the August 2000 monitoring event <br /> IAdvanced GeoEnvironmental tnc <br />