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' 06 July 1999 <br /> . AGE-NC Protect No 95-0173 <br />' Page 2 of 6 <br />' and was stored on-site in an area lacking general public access <br /> I2 2 GROUND WATER SAMPLING <br /> Following purging, ground water levels in monitoring wells MW-1 through MW-4, MW-6 through <br />' MW-10, MW-12, VW-1, AW-113 and AW-2B were allowed to achieve a minimum of 80 percent <br /> recharge prior to sample collection Ground water samples were collected from the purged wells <br /> utilizing new, disposable polyethylene bailers, one 1-liter amber bottle and four 40-m1 EPA- <br /> approved VOA vials containing 0 5 ml 18% hydrochloric acid as a preservative Care was taken to <br /> ensure that visible air bubbles were not present in the vials after filling and capping Ground water <br /> sample containers were labeled with the well designation, date, time, and sampler's initials <br />' 23 LABORATORY ANALYSIS OF GROUND WATER SAMPLES <br /> Each ground water sample was logged on a chain-of-custody form, placed in a chilled container and <br />' transported to a California Department of Health Services (DHS)-certified laboratory for <br /> = Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d, <br /> respectively) by EPA Method 8015M, <br /> • Volatile aromatics benzene,toluene, ethyl benzene and xylene(BTEX) with methyl-tertiary <br /> butyl ether (MTBE) by EPA Method 8020, and <br /> • Fuel oxygenated compounds tertiary butanol (TBA), di-isopropyl ether (DIPE), ethyl tert <br /> butyl ether (ETBE), tert amyl methyl ether (TAME) and MTBE by EPA Method 8260M <br /> 3.0. FINDINGS <br /> From the field data, AGE was able to determine an east-northeastward ground water flow direction <br /> at a gradient of 0 002 ft/ft Laboratory analysis of thirteen ground water samples detected TPH-g. <br /> TPH-d and BTEX, oxygenated fuel additives were detected in three ground water samples <br /> 3 1 RELATIVE GROUND WATER ELEVATION AND GRADIENT <br /> During the April 1999 monitoring event, depths to ground water in wells MW-i through MW-12, <br /> • VW-1, VW-2, AW-1 B and AW-213 were measured between 22 23 and 24 51 feet below the tops of <br /> Advanced GeoEnvironmentai,Inc <br />