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• 05 August 1998 AC"TL-NG Project No 95-0173 Page 2 of 3 • The approximate cost for Installation of a thermal oxidizer-based SVE system Including the Installation of five additional SVE wells will be $20,000 00 to $30,000 00 The estimated cost for operation, maintenance and monitoring (Including unit rental) will be $40,000 to $55,000 per year Periodic costs,such as non-routine maintenance and supplemental fuel, can range from $10,000 to $20,000 annually IN-SITUAIR SPARGING Based upon data collected at the site during a 72-hour IAS pilot test performed between 13 and 15 January 1998, AGE concludes • A theoretical radius of influence between 15 and 20 fee�for ground water air sparging Utilizing existing IAS wells AW-1 and AW-2 and existing ground water monitoring wells MW-1, MW-2 and MW-3 for air infection, we recommend the Installation of five additional IAS wells to effectively remediate ground water at the site Proposed and existing IAS well locations with respected theoretical radii of influence are illustrated in Figure 11 • Air sparging within moderately permeable aquifers generally results in a moderate reduction of volatile hydrocarbon concentrations in the saturated zone Remediation durations are generally comparable with SVE Therefore, we anticipate a 18 to 24 month remediation period will result in a 90 percent reduction in dissolved shorter-chain hydrocarbons IAS will not be as effective in reducing concentrations of longer-chain hydrocarbons • Installation of an IAS system will require a piping system and additional equipment Installation and setup costs are estimated to be $20,000 to $30,000 Maintenance and monitoring costs will be $10,000 to $20,000 annually Periodic costs, such as non-routine maintenance and supplemental fuel, can range from $5,000 to $10,000 annually • Advanced GeoEnvironznental, Inc