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I F <br />' 02 December 2002 <br /> AGE-NC Project No 98-0534 <br />' Page 2 of 4 - <br />' disposable plastic bailer Immediately upon retrieval, each sample was transferred Into one 1-liter <br /> amber bottles and three 40-m1 EPA-approved volatile organic analysis (VOA) vials containing 0 5 <br /> ml 18% hydrochloric acid as a sample preservative The samples were properly labeled, logged on <br />' a chain-of-custody form and stored In a chilled container under Ice The samples were later <br /> transported under chain-of-custody to McCampbell Analytical Inc (MAI), a State of California <br /> Department of Health Services (DHS)-certified analytical laboratory, and analyzed for <br /> - Total petroleum hydrocarbons quantified as gasoline (TPH-g) and diesel (TPH-d) In <br /> accordance with EPA Method 8015 Modified, <br />' - Benzene, toluene, ethylbenzene and total xylenes (BTEX) and methyl tertiary-butyl ether <br /> (MTBE) In accordance with EPA Method 8020, and <br />' - The oxygenated compounds di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), <br /> MTBE, tertiary-amyl methyl ether (TAME), tertiary butanol (TBA), ethanol, methanol, <br /> dibromoethane (EDB) and 1,2-dlchloroethane (1,2-DCA) In accordance with EPA Method <br /> 8260-Modified <br /> lie 3 0. FINDINGS <br /> Ground water elevation, flow direction and gradient were determined from field data collected on <br /> 02 October 2002, the contaminant Impact to ground water was quantified from the laboratory data <br /> 3 1 GROUND WATER ELEVATION AND GRADIENT <br />' The relative elevation of ground water In each well was calculated by subtracting the depth to ground <br /> water from the relative casing elevation (Table 1) The depth to ground water on 02 October 2002 <br /> ranged between 11 91 to 13 46 feet below the tops of the well casings, relative ground water <br /> elevations ranged between 6 91 feet (MW-1) to 8 28 feet (MW-4) below mean sea level (MSL) <br /> Presently the water table Is at the top of the screened Interval of the wells <br /> The water table was Inferred to be relatively flat In the area of the former UST area,trending towards <br /> a steeper northwest-oriented depression at the northern portion of the site, In the area of well MW-4 <br />' (Figure 3) The gradient ranged from essentially flat at the former UST area to 0 04 ft/ft at the <br /> northern edge of the site <br /> i <br />' Advanced GeoEnvironmental,Inc <br /> I <br />