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I , 16 July 2001 AGE-NC Project No 95-0135 IPage 2of4 2 2 ` COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES ' Water samples were collected from each monitoring well using new disposable bailers The sam Ies were transferred into 40-m1 EPA-approved volatile organic analysis(VOA)vials containing 0 5 ml hydrochloric acid(18%)as apreservative.The samples were transported in a chilled container,under chain-of-custody,to Precision Enviro-Tech(PET)of Stockton, a State of California Department of ' Health Services(DHS)-certified laboratory,for analytical analysis The samples were analyzed for 0 Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA IMethod 8015 Modified, • Volatile aromatics compounds-benzene, toluene, ethyl benzene and total xylenes (BTEX), oxygenating compounds including methyl tertiary-butyl ether(MTBE),tertiary-butyl alcohol I (TBA),di-isopropyl ether(DIPE),ethyl tertiary-butyl ether(ETBE)and tertiary-amyl methyl ether (TAME), methanol, ethanol, ethylene dibromide (EDB) and 1,2-dichloroethane (1,2- DCA) in accordance with EPA Method 8260 Modified • 3.0. FINDINGS Ground water flow direction and gradient were inferred from field data,the petroleum hydrocarbon impact on ground water was quantified by the results of laboratory analysis 3 1 GROUND WATER ELEVATION AND GRADIENT During the April 2001 monitoring event,depths to ground water in wells MW-i through MW-3 were measured between 23 76 and 25 01 feet below the tops of the well casings The ground water elevations were calculated to be between -11 86 feet and -12 02 feet below mean sea level During the April monitoring evenf the shallow ground water underlying the site flowed to the southeast under a gradient of 0 002 ft/ft The ground water elevation data for MW-1B through MW-3B during the April 2001 ground water monitoring event is depicted on Figure 3 During the April monitoring event the deeper ground water underlying the site flowed to the southeast with a gradient of 0 0006 Rift The ground water elevation data for MW-1A through MW-3A during the April 2001 ground water monitoring event is depicted in Figure 4 • Advanced GeoEnvironmental,Inc r