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Static Water Level Measurements Prior to all ground water purging and sampling, static water levels in each well will be measured using an electric water level indicator.Water level data will be recorded to the nearest 0.01-foot from a reference point marked on the top of each PVC well casing. Before and after each use, the measurement device will be rinsed with an Alconox solution and then clean tap water. Ground Water Monitoring Well Evacuation Prior to sample collection, each well will be purged utilizing '/z-inch polyethylene tubing and a Watera-Hydro-Lift H pump equipped with a mechanical arm to surge the tubing. Each well will be purged until: 1) a minimum of three casing volumes is removed from the well; and/or 2) the field- measured ground water parameters(i.e.,temperature,pH,and specific conductivity)have stabilized to ensure that each sample is representative of the surrounding aquifer ground water. In addition, ground water will be measured for dissolved oxygen and oxidation-reduction potential. However, if the well is purged dry prior to evacuating three casing volumes, a ground water sample will be collected following 80 percent recovery of ground water within the well. Ground Water Sample Collection Ground water samples will be collected from purged wells utilizing '/z-inch diameter polyethylene tubing and a Watera-Hydro-Lift II pump. Ground water samples will be transferred into laboratory-supplied containers. Care will be taken to ensure that visible air bubbles are not present in the vials after filling and capping.Ground water sample containers will be labeled with each well designation, date, time, and sampler's initials. Sample Handling For the Ozone Injection Bench Scale Study,approximately 6 liters of ground water will be required from each sampling location. Samples will be collected into laboratory-supplied amber liter containers without sample preservative. For the Baseline Analysis, ground water samples for Total petroleum hydrocarbons quantified as gasoline(TPH-g)in accordance with EPA Method 8015 Modified;Benzene,toluene,ethyl-benzene and total xylenes (BTEX); the fuel additives methyl tertiary butyl ether (MTBE), tertiary butyl alcohol (TBA), di-isopropyl ether(DIPE), ethyl tertiary butyl ether (ETBE), tertiary amyl methyl ether (TAME), ethylene dibromide (EDB) and 1,2-dichloroethane (1,2-DCA) in accordance with EPA Method 8260 Modified analyses will be collected into four 40-milliliter(ml)volatile organic analysis (VOA)vials without a sample preservative. Samples for total metals analysis will be collected into one 500-m1 plastic container with nitric acid preservative. Samples for dissolved metals analysis will be collected into one 500-m1 plastic container without preservative.