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' 27 March 2006 AGE-NC Project No 99-0592 ' Page 2 of 4 ' for approximately 15 minutes ' 2 2 COLLECTION OF GROUND WATER SAMPLES Water samples were retrieved from well MW-1 while purging To sample the domestic well, a ' sampling port was opened at the well head and samples were collected from the port while the pump was operating Each sample was transferred into three laboratory-supplied 40-milliliter(ml) EPA- approved VOA vials containing 0 5 ml 18% hydrochloric acid solution as a sample preservative 1 The samples were labeled,placed in a chilled container, and transported under chain of custody to Cal Tech Environmental Laboratories(CTEL),a California Department of Health Services (DHS)- certified DHS)- certifed analytical laboratory, for analysis The samples were analyzed for .�Y t At, • Total petroleum hydrocarbons quantified as gasoline (TPH-g) an - in ' accordance with EPA Method 8015M, and • Benzene,toluene,ethylbenzene,and total xylenes(BTEX)and the fuel additives di-isopropyl ether(DIPE),ethyl tertiary-butyl ether(ETBE),methyl tertiary-butyl ether(MTBE),tertiary- amyl methyl ether (TAME), tertiary-butanol (TBA), 1,2-dibromoethane (EDB), 1,2-dichloroethane (1,2-DCA), ethanol, and methanol In accordance with EPA Method ' 8260B, and • At the direction of EHD Trichloroethene(TCE)and tetrachloroethene (PCE) In accordance with EPA Method 8260B ' 3.0. FINDINGS Ground water elevation, flow direction,and gradient were determined from field data collected on ' 08 December 2005 Laboratory analysis of ground water samples were used to quantify the impact to ground water 1 3 1 GROUNDWATER GRADIENT AND FLOW DIRECTION ' On 08 December 2005, depth to ground water was measured between 6178 feet and 62 82 feet below the top of the well casings, ground water elevations at the site ranged from 35 03 feet below ' mean sea level(MSL)In MW-1 to 35 95 feet below MSL in well MW-4 The ground water flow was directed toward the north-northeast with a hydraulic gradient calculated at approximately 0 004 foot/foot (ft/ft) Depth to water and ground water elevations are summarized in Table 1 ' Advanced GeoEnvironmental,Inc