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F <br /> t� <br /> 05 November 2010 <br /> AGE-NC Project No. 96-0254 <br /> Page 2 of 6 <br /> collected from 2353 Toste Road, Tracy, CA. In May 2010, ground water samples were <br /> collected from wells MW-1 B and MW-4 at 2450 Toste Road and analyzed for chromium, <br /> hexachrome, bromide, and bromate. <br /> Based on the data collected during the February and May 2010 sampling events, it <br /> appears that ozone injection at 2353 Toste Road (Tracy Marine Sales)did not degrade the <br /> quality of ground water. Based on the location, lithology and geochemistry of the Curtiss <br /> Pontiac site compared to the Tracy Marine Sales site,AGE concludes that ozone injection <br /> will not have an adverse effect on ground water quality at 2450 Toste Road, Tracy, CA <br /> (Curtiss Pontiac). <br /> 2.1. PERMITTING AND PRE-FIELD WORK ACTIVITIES <br /> Applicable site assessment permits will be submitted to the San Joaquin County EHD and <br /> a health and safety plan will be prepared in accordance with Occupational Safety and <br /> Health Guidance Manual for Hazardous Waste Site Activities (National Institute for <br /> Occupational Safety and Health Administration, U.S. Coast Guard and U.S. Environmental <br /> Protection Agency, 1985). Prior to drilling activities, each proposed drilling location will be <br /> clearly marked and a utility clearance obtained through Underground Service Alert. <br /> 2.2. OZONE INJECTION WELL INSTALLATION <br /> Based on concentrations of total petroleum hydrocarbons as gasoline (TPH-g) and <br /> benzene in the area of wells MW-1 B and MW-4, borings PB4 (dispenser area), PB5 and <br /> B6, and the former UST and dispenser areas, AGE proposes installation of a total of ten <br /> (10) ozone injection wells. Additional ozone injection wells installations will be proposed, <br /> as necessary, based on the performance of the ozone pilot test. <br /> The proposed ozone injection wells will be screened below the watertable and into ground <br /> water, at areas of known petroleum-impacted ground water. Proposed well locations are <br /> depicted in Figure 2. <br /> 2.3. OZONE INJECTION DISTRIBUTION NETWORK INSTALLATION <br /> A system of %-inch diameter polyethylene tubing will be installed in appropriately sized <br /> poly-vinyl chloride (PVC)conduitwithin 8-inch wide trenches approximately one foot below <br /> surface grade(bsg)and routed from each ozone injection well head to the proposed ozone <br /> generating unit. Piping construction will be appropriate for tubing replacement or repairs. <br /> Following piping placement, the trench will be backfilled with imported road-base sand, <br /> Advanced Geo Environmental,Inc. <br />