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• 06 September 2001 <br /> AGE-NC Project No 98-0534 <br />' Page 2 of 4 <br />' approved H-17 storage drums pending proper disposal Following purging, the depth to ground water <br /> was measured to ensure that a minimum of 80% well-volume recharge had been achieved prior to <br /> samphng, however well MW-3 was sampled with a recharge of 75 % and well MW-8 was sampled <br />' with a recharge of 52% A water sample was collected from each well using a new, clean, disposable <br /> plastic bailer Immediately upon retrieval, samples were transferred into one-liter amber bottles and <br /> three 40-m1 EPA-approved volatile organic analysis (VOA) vials containing 0 5 ml 18% hydrochloric <br /> acid as a sample preservative The samples were logged on a chain-of-custody form, stored m a <br /> chilled container under ice The samples were later transported under chain-of-custody to McCambell <br />' Analytical, Inc (MAI), a State of California Department of Health Services (DHS)-certified analytical <br /> laboratory for analysis <br />' 2 2 GROUNDWATER ANALYSIS <br /> A total of seven ground water samples were analyzed for the following <br /> Total petroleum hydrocarbons quantified as gasoline (TPH-g) and diesel (TPH-d) in <br />�• accordance with EPA Method 8015-Modified, <br /> Volatile aromatic hydrocarbons - benzene, toluene, ethylbenzene and total xylenes (BTE C) <br /> in accordance with EPA Method 8020, and <br /> c 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), ethyidibromide (EDB) and 1,2--dichloroethane (1,2-DCA) m accordance with EPA <br /> Method 8260-Modified, respectively <br /> 3.0. FINDINGS <br /> Ground water elevation, flow direction and gradient were determined from field data collected on <br /> 29 May 2001, the contaminant impact to ground water was assessed from the laboratory data <br /> 3 1 GROUND WATER ELEVATION AND GRADIENT <br /> The casing elevation of each well surveyed are contained in Table 1 The average depth to ground <br /> water on 29 May 2001 was 10 5 feet below the tops of the well casings The top of the ground water <br /> table occurred within the screened intervals of the wells Ground water was inferred to be flowing <br /> to the south - southeast to southwest (Figure ,3) with a hydraulic gradient of approximately <br /> Advanced GeoEunru=enW,Inc <br /> I <br />