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1 ' 02 .January 2002 AGE-NC Project No. 95.0185 Page 3 of 5 1 plastic bailers. Each water sample was then transferred into one 1-liter amber bottle and three 40-m1 volatile organic analysis (VOA) vials containing 0.5 ml I8% HCI as a sample preservative. The samples were then labeled and placed in a chilled container for transport under chain-of-custody to McCampbell Analytical, Inc. (MAI), a California Department of Health Services (DHS)-certified analytical laboratory. All water samples were analyzed for: • Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d) in ' accordance with EPA Method 8015 Modified and • Benzene, toluene, ethylbenzene and total xylene (BTEX) with methyl tertiary butyl ether ' (MTBE) in accordance with EPA Method 8020. ' AlI water sample collected from the probe borings were also analyzed for: • Oxygenated compounds - di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), methyl tertiary-butyl ether (MTBE), tertiary-amyl methyl ether (TAME), tertiary butanol lie (TBA), methanol, ethanol, ethylene dibromide (EDB) and 1,2-dichloroethane(1,2-DCA) in accordance with EPA Method 8260 Modified. 1 3.0. FEND1{NGS Ground water elevation, flow direction and gradient were determined from field data collected on ' 26 October 2001;the contaminant impact to ground water was quantified by the ground water sample laboratory analytical data. 3.1. GROUND WATER GRADIENT AND FLOW DIRECTION ' During the October 2001 sampling event, the depth to ground water observed in all the wells at the site ranged from 23.15 to 23.98 feet bsg. The depth to ground water data collected from well MW-4 appears to affected by the presence of free-product. The thickness of the product was not properly _ measurable to recalculate a relative Pround water elevation__Therefore_the_relative,ground_water__, elevation from well MW-4 was discounted when preparing the ground water gradient map. Utilizing the other ground water elevation data, a ground water flow direction was developed similar to historical flow directions. The relative ground water elevation at the site ranged from 36.69 to 36.76 feet. The groundwater ' flow direction determiried during this monitoring event is toward the southeast with a hydraulic - gradient of 0.0004 feet/feet. The relative ground water elevations at the site are contoured on ' Advanced GeoEnvironmenta4 lite.