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• 20 August 2002 AGE-NC Project No. 95-0185 Page 2 of 4 Free product was encountered in well MW-4. The amount of free product recovered in the bailer p during purging increased from a thickness of approximately '/2 inch at the initial bail to 10 inches at ' the final bail 2.2. COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES ' Ground water samples were collected from each monitoring well using the dedicated disposable plastic bailers. Each water sample was then transferred into three 40-m1 volatile organic analysis (VOA) vials containing 0.5 m] 18% HCl as a sample preservative one 1-liter amber bottle and one ' I-liter amber bottle without 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: ' . a 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) and methyl tertiary butyl ether ' (MTBE) in accordance with EPA Method 8020. The oxygenated compounds di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), ' methyl tertiary-butyl ether (MTBE), tertiary-amyl methyl' ether (TAME), tertiary butanol (TBA) in accordance with EPA Method 8250 Modified. 3.0. FINDINGS ' Ground water elevation, flow direction and gradient were determined from field data collected on 21 June 2002, 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 June 2002 sampling event,the depth to ground water ranged fi-om 23.1.6 to 24.54 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 measurable to recalculate a relative ground water elevation, therefore the relative ground water elevation from well MW-4-was discounted when . ' preparing the ground water"gradient map: S ' Advanced Geo EnvironmentaL Inc.