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' 01 June 2001 AGE-NC Project No 95-0128 ' Page 2 of 5 ' water was treasured to ensure that a minimum of 80%well-volume recharge had been achieved prior to sampling 2 2 GROUND WATER SAMPLE COLLECTION ' A water sample was collected from each well using a new, clean, disposable plastic bailer Immediately upon retrieval, samples were transferred into three 40-milliliter (ml) EPA-approved ' volatile organic analysis (VOA) vials containing 0 5 ml 18% hydrochloric acid as a sample preservative and into one 1-liter amber bottle without the preservative The samples were logged on a chain-of-custody form, stored in a chilled container and transported under chain-of-custody to ' McCampbell Analytical Inc (MAI), a California Department of Health Services (DHS)-certified laboratory The ground water samples were analyzed for • Total petroleum hydrocarbons quantified as gasoline (TPH-g) and diesel (TPH-d) in accordance with EPA Method 5015 Modified, . Volatile aromatic hydrocarbons - benzene, toluene, ethylbenzene and total xylenes (BTEX) ' and methyl tertiary-butyl ether (MTBE) m accordance with EPA Method 8020, and Oxygenated compounds - di-isopropyl ether (DIPS), ethyl tertiary-butyl ether (ETBE), ' MTBE, tertiary-amyl methyl ether (TAME), tertiary butanol (TBA), methanol, ethanol, ethylene dibrormde (EDB) and 1,2--dichloroethane (1,2-DCA) m accordance with EPA Method 8260 I ' 3.0. FINDINGS - Ground water elevations were determined by subtracting the measured depths-to-water from the surveyed 'casing elevations Ground water flow directions were determined by contouring the water elevations on a scaled site plan (Figure 3) The impact of the unauthorized release on ground water was quantified by laboratory analysis of samples collected during the quarter 3 1 GROUND WATER ELEVATION AND GRADIENT The average ground water elevation on 24 April 2001 was approximately 0 30 feet higher than the average ground water elevation during the January 2001 monitoring event The ground water table -- — --occurred-witbin the screened-intervals-of-the wells-monitored,-with-the-exception of the deeply -- - sci eened monitoring wells (MW-1 to MW-3, MW-11 B and MW-12B) Advanced GeoEnvtronmental Inc