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06 April 2004 • AGE-NC Project No 99-0592 IPage 2 of 4 addition, a water sample was collected from domestic well DW-1 after the well purge valve was opened and water was allowed to run until the pump turned on The samples were transferred into laboratory-supplied 40-mL EPA-approved volatile organic analysis(VOA)vials containing 0 5 mL 18%hydrochloric acid as a sample preservative The sample containers were then labeled with the ' well designation, date, time and the sampler's initials The samples were transported in a chilled container under chain-of-custody to Cal Tech Environmental Laboratories (CTEL), a California Department of Health Services(DHS)-certified laboratory,for analysis The samples were analyzed for • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA IMethod 8015M, • Benzene, toluene, ethylbenzene and total xylenes (BTEX) and methyl tertiary butyl ether (MTBE) in accordance with EPA Method 8021 or EPA Method 8260B, and • Fuel additives di-isopropyl ether DIPE ethyl tertiary-butyl ether ETBE , MTBE, tertiary amyl methyl ether(TAME), tertiary butanol (TBA), methanol, ethanol, 1,2-dibromoethane (EDB) and 1,2-dichloroethane (1,2-DCA) in accordance with EPA Method 8260B 3.0. FINDINGS Ground water elevation, flow direction, and gradient were determined from field data collected on 08 July 2003 and 12 December 2003 Laboratory analysis of ground water samples was used to Iquantify the impact to ground water 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION Y I On 08 July 2003, depth to ground water was measured between 62 90 feet and 64 92 feet below the I top of the well casings, ground water elevations at the site ranged from 35 11 feet below mean sea level(MSL) in MW-1 to 38 35 feet below MSL inwells MW-2 and MW-3 The groundwater flow was directed toward the southwest with a hydraulic gradient calculated at approximately 0 0008 Ifoot/foot On 12 December,depth to ground water was measured between 63 40 feet and 65 34 feet below the I top of the well casings, ground water elevations at the site ranged from 35 61 feet below MSL in well MW-1 to 38 69 feet below MSL in well MW-4 The ground water flow was directed toward the northeast with a hydraulic gradient calculated at approximately 0 0007 ft/ft ' Ground water elevation data from well MW-I was not used to determine the gradient for the July • or December monitoring events,this well is screened at a different interval than wells MW-2 through IAdvanced GeoEnvironmental,Inc I