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� <br /> I 21 June 200r2 <br /> • AGE-NC Project No 98-0426 <br /> Page 3 of 5 <br /> 3 2 COLLECTION OF GROUND WATER SAMPLES <br /> Water samples were collected from the purged wells using new disposable plastic bailers Each water <br /> sample was transferred into three 40-m1 VOA vials containing 0 5 inl 18% hydrochlonc acid as a <br /> I sample preservative After collection, the samples were properly labeled, placed in a chilled <br /> container and transported under chain-of-custody to McCampbell Analytical, Inc (MAI), a <br /> California Department of Health Services-certified laboratory The samples were analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> IMethods 5030/8015 modified, <br /> • Benzene,toluene,ethylbenzene and xylenes(BTEX)and methyl tertiary-butyl ether(MTBE) <br /> in accordance with EPA Method 8020, and <br /> • The fuel oxygenates MTBE, di-isopropyl ether (RIPE), ethyl tertiary-butyl ether (ETBE), <br /> tertiary-amyl methyl ether (TAME), and tertiary butanol (TBA) in accordance with EPA <br /> Method 8260 modified <br /> 4.0. FINIDINGS <br /> Ground water flow direction and gradient were inferred from data collected in the field, the <br /> hydrocarbon impact to ground water was quantified by the laboratory data obtained from the ground <br /> water samples <br /> 4 1 GROUND WATER ELEVATION AND GRADIENT <br /> The elevation of ground water in each well was calculated by subtracting the depth to ground water, <br /> from the surveyed casing elevations (Table 1) Depths to ground water ranged from 22 57 feet to <br /> 23 68 feet as measured from the top of the well casings Ground water elevations at the site ranged <br /> from 13 08 feet below mean sea level`(MSL)in MW2 to 13 29 feet below MSL in MW5,decreasing <br /> an average of 0 06 feet between the February 2002 and May 2002 monitoring events Ground water <br /> was within the screened intervals in all five wells The ground water gradient was calculated to be , <br /> approximately 0 003 ft/ft with a northeasterly flow direction The ground water elevation contours <br /> are depicted on Figure 2 <br /> Advanced GeoEnvironmental,Inc <br />