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18 July 2002 1 <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 new disposable plastic bailers Immediately upon retrieval,the samples were transferred <br /> into 40-m1 EPA-approved VOA vials containing 0 5ml 18% hydrochloric acid as a sample <br /> preservative The samples were labeled, stored on ice, and transported in a chilled container,under <br /> chain-of-custody,to McCampbell Analytical,Inc (MAI),a State of California Department of Health <br /> Services-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 /> • Benzene,toluene,ethylbenzene and xylenes(BTEX)and methyl tertiary-butyl ether(MTBE) <br /> in accordance with EPA method 8021B, <br />! • The fuel additives di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETRE), MTBE, <br /> tertiary-amyl methyl ether(TAME), tertiary butanol (TBA), 1,2-dibromoethane (EDB) and <br />� . 1,2-dichloroethane (1,2-DCA) in accordance with EPA Method 8260B <br />' 3.0. FINDINGS <br /> Ground water elevation and flow direction were inferred from field data collected on 07 June 2002 <br /> The hydrocarbon-impact to ground water was quantified by laboratory analysis of the ground water <br /> 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 24 feet to 56 55 feet below the tops of the well casings <br /> Ground water elevations at the site ranged from 3 19 feet below mean sea level (MSL) in well <br />' MW-13 to 0 75 feet above MSL in well MW-6 Ground water elevations at the site decreased an <br /> average of 0 90 feet between the March 2002 and June 2002 sampling events Ground water levels <br /> were within the screened Intervals of all the wells sampled <br /> IThe ground water appears to flow radially outward between west-southwest at the western edge of <br /> the site and south at the central portion of the site The ground water gradient ranged between <br />' Advanced GeoEnvironmental,Inc <br /> I <br />