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04 March 2002 <br /> AGE-NC Project No 95-0111 <br /> Page 2 of 4 _ <br /> than 15 minutes,allowing the pump to turn on Water samples were transferred into three chilled 40- <br /> ml volatile organic analysis(VOA)vials containing 0 5 ml 18%hydrochloric acid(HCI)as a sample <br /> preservative and into one 1-liter amber bottle without a sample preservative <br /> The samples were then labeled and placed in a chilled container for transportation under <br /> chain-of-custody to Cal Tech Environmental laboratories(CTEL)and McCampbell Analytical,Inc <br /> (MAI),both California Department of Health Services(DHS)-certified analytical laboratories Each <br />' sample was analyzed for <br />' • Total petroleum hydrocarbons quantified as gasoline and diesel(TPH-g and TPH-d)by EPA <br /> Methods 5030/8015 Modified and 35501$015 Modified, respectively, <br /> • Volatile aromatic compounds-benzene,toluene,ethylbenzene and total xylenes(BTEX)and <br /> Imethyl tertiary-butyl ether(MTBE) by EPA Method 8020, and <br /> • Fuel additives - di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), MTBE, <br />' tertiary-amyl methyl ether (TAME), tertiary-butyl alcohol (TBA), 1,2-dichloroethane <br /> (1,2-DCA) and ethylene dibromide (EDB) by EPA Method 8260 Modified <br /> lie <br /> 3.0. FINDINGS <br />' Ground water elevation, flow direction, and gradient were determined from field data collected on <br /> 26 December 2001, the contaminant impact to ground water was assessed from the laboratory <br />' analytical data _ <br />' 3 1 GROUND WATER FLOW DIRECTION AND GRADIENT <br /> The elevation of ground water in each well was calculated by subtracting the depth to ground water <br />' from the surveyed well casing elevations (Table 1) <br /> r <br /> The depth to ground water ranged from 5 99 feet to 9 26 feet below the tops of the well casings <br />' Ground water elevations at the site ranged from 10 11 feet above mean sea level (MSL) in well <br /> MW-6 to 1121 feet above MSL in well MW-3 Ground water elevations at the site increased an <br /> average of 0 44 feet between the September 2001 and December 2001 sampling events <br />' Thegrow nd water flow direction is inferred to be towards the north-northwest under an average <br /> hydraulic gradient of 0 009 feet/feet Figure 3 illustrates the contoured ground water elevations <br /> 1 <br /> Advanced GeoEnvironmental Inc <br /> 1 <br />