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' 15 February 2002 <br /> • AGE-NC Project No. 95-0185 <br /> Page 2 of 4 <br />' 2.2. COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES <br /> t Ground water samples were collected from each monitoring well using the dedicated disposable <br /> plastic bailers. Each water sample was then transferred into one 1-liter amber bottle and three 40-ml <br /> volatile organic analysis (VOA) vials containing 0.5 ml 18% HCl as a sample preservative. The <br /> samples were then labeled and placed in a chilled container for transport under chain-of-custody to <br /> McCampbell Analytical, Inc. (MAI), a California Department of Health Services (DHS)-certified <br /> analytical laboratory. <br /> All water samples were analyzed for: <br />' Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d) in <br /> accordance with EPA Method 8015 Modified and <br /> • Benzene, toluene, ethylbenzene and total xylene (BTEX) with methyl tertiary butyl ether <br /> (MTBE) in accordance with EPA Method 8020. <br /> • • Oxygenated compounds - di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), <br /> ' methyl tertiary-butyl ether (MTBE), tertiary-amyl methyl ether (TAME), tertiary butanol <br /> (TBA) in accordance with EPA Method 8260 Modified. <br /> 3.0. FINDINGS <br /> ' Ground water elevation, flow direction and gradient were determined from field data collected on <br /> 29 January2002,the contaminant impact to ground water was quantified by the ground water sample <br /> ' laboratory analytical data. <br /> ' 3.1. GROUND WATER GRADIENT AND FLOW DIRECTION <br /> ' During the January 2002 sampling event, the depth to ground water observed in all the wells at the <br /> site ranged from 22.10 to 22.76 feet bsg. The depth to ground water data collected from well MW-4 <br /> appears to affected by the presence of free-product.The thickness of the product was not measurable <br /> T .T to recalculate a relative ground water elevation, therefore the relative ground water elevation from <br /> well M_'W'_ was discounted when preparing the ground water gradient map. Utilizing the other <br /> ground water elevation data, a ground water flow direction was developed similar to historical flow <br />' directions. <br /> Advanced GeoEnvironmental,Inc. <br />