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TreadweII&Rollo <br /> • <br /> 24 months, so the total operations and maintenance charges could range from $24,000 to <br /> $96,000. <br /> Ozone Sparging <br /> Ozone sparging systems consist of specially-engineered sparge wells connected to ozone <br /> generators. Some sparge wells contain recirculation pumps to create flow cells around the well, <br /> resulting in a greater lateral dispersion of the ozone. Typical five-well ozone sparge systems cost <br /> $60,000 to $90,000, including engineering and permitting. Monthly operations and maintenance <br /> costs range from $2,060 to $4,000. Operation life is often 6 to 12 months, so the total operations <br /> and maintenance charges could range from $12,000 to $48,000. <br /> Hydrogen Peroxide Injection <br /> Hydrogen peroxide injection generally involves the construction of steel injection wells specially <br /> • designed to handle the temperatures and pressures generated by diluted hydrogen peroxide <br /> solutions. The estimated cost of the wells, hydrogen peroxide solution, system engineering, and <br /> monitoring at a five-well system is $70,000 to $120,000. Monthly operations and maintenance <br /> costs range from $8,000 to $10,000. Operation life is often 1 to 4 months, so the total operations <br /> and maintenance charges could range from $8,000 to $40,000. <br /> Vacuum Extraction <br /> Vacuum extraction for groundwater treatment and source area removal typically uses vacuum <br /> extraction wells with air sparge wells to bring contaminants from the saturated zone to the <br /> capillary fringe. This is similar to the treatment system now operating at Area 16. The cost of <br /> the treatment equipment installed at Area 16 is not known, but is assumed to be in the $125,000 <br /> to $150,000 range. This includes all vertical and horizontal wells, a blower, and catalytic <br /> oxidizer. Monthly operations and maintenance costs are assumed to be approximately $3,000 to <br /> $5,000. Operation life is often 12 to 30 months, so the total operations and maintenance charges <br /> • could range from $36,000 to $150,000. <br /> 38 <br /> 25970318.PGS 15 November 2000 <br />