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03 July 1997 <br /> AGE-NC Project No 95-0130 <br /> Page 2 of 2 <br /> approximately $40,000 to $55,000 per year <br /> • Periodic costs, such as non-routine maintenance and supplemental fuel (natural gas or <br /> propane), will range from $10,000 to $20,000 annually <br /> IN-SITUAIR SPARGING <br /> • Air sparging within moderately permeable aquifers generally results in a moderate reduction <br /> of volatile hydrocarbon concentrations in the saturated zone Remediation durations are <br /> generally comparable with SVE Therefore, we anticipate a 12 to 24 month remediation <br /> period will result in an 75 to 90 percent reduction in dissolved shorter-chain hydrocarbons <br /> IAS will not be as effective in reducing concentrations of longer-chain hydrocarbons <br /> • Installation of an IAS system will require numerous sparging points, a piping system and <br /> equipment Installation and setup costs are estimated to be $25,000 to $30,000 <br /> + Maintenance and monitoring costs will range from $10,000 to $20,000 annually <br /> Periodic costs, such as non-routine maintenance and supplemental fuel (electricity), can range <br /> from $5,000 to $10,000 annually <br /> I Upon approval of the RAWP, a detailed cost estimate will be provided to the Top Filling Station for <br /> the entire scope of work The opportunity to provide this service is greatly appreciated If you have <br /> any questions or comments, please contact our office at (209) 956-0264 <br /> Sincerely, <br /> Advanced GeoEnvironmental, Inc <br /> Timothy J Cu ar Sob Marty <br /> Staff Geologist Project Geologist/Direct6 e Operations <br /> Enclosures <br /> cc 2 addressee <br />