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07 January 2002 <br /> AGE-NC Project No 95-0109 <br />' Page 2 of 4 <br /> 2 2 COLLECTION OF GROUND WATER SAMPLES <br /> The depth to water was remeasured after purging to ensure a minimum of 80 per cent recharge of <br />' the initial water level in each well prior to sampling-Water samples were collected from each purged. <br /> well using disposable plastic bailers Immediately upon retrieval,the samples were transferred into <br /> 40-m1 EPA-approved VOA vials containing 0 5ml 18%hydrochloric acid as a sample preservative <br />' The samples were labeled, stored on ice, and transported in a chilled container, under chain-of- <br /> custody,to CalTech Environmental Laboratories(CTEL),a State of California Department ofHealth <br /> Services (DHS)-certified analytical laboratory The ground water samples were analyzed for <br />' • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> Methods 5030/8015M, <br /> I • Benzene,toluene,ethylbenzene and xylenes(BTEX)and methyl tertiary-butyl ether(MTBE) <br /> in accordance with EPA method 80201602, <br /> • Fuel additives - di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), MTBE, <br /> tertiary-amyl methyl ether(TAME),tertiary butanol (TBA), ethylene dibromide(EDB)and <br /> 1,2-dichloroethane (1,2-DCA) in accordance with EPA Method 8260M <br /> I <br /> 3.0. FINDINGS <br /> Ground water elevation and flow direction were inferred from field data collected on 10 December <br />' 2001 The hydrocarbon-impact to groundwater was quantified by,laboratory analysis of the ground <br /> water samples <br /> 3 1 GROUND WATER GRADIENT AND DIRECTION <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 />' The depth to ground water ranged from 52 77 feet to 56 00 feet below the tops of the well casings <br /> Ground water elevations at the site ranged from 2 64 feet below mean sea level (MSL) in well <br /> MW-13 to 0 22 feet above MSL in well MW-6 Ground water elevations at the site increased an <br /> average of 0 55 feet between the September 2001 and December 2001 sampling events Ground <br /> water levels were within the screened intervals of all the wells sampled <br /> I " <br /> Advanced GeoEnviranrnental,Inc <br /> ' a <br />