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Co of 0 <br />16 April 1997 <br />SAGE -NC Project No 95-0121 <br />Page 2 of 2 <br />from $10,000 to 520,000 annually <br />I11r SITU AIR 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 tiNith SVE Therefore, we anticipate a 12 to 24 month remediation <br />period will result in an 50 to 90 percent reduction in drssol-Ved shorter -chain hydrocarbons <br />I kS will not be as effectrve in r educing 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 $20,000 to 530,000 Maintenance <br />and rnomtonng costs bill be $10,000 to $20,000 annually Penodre costs, such as non -routine <br />maintenance and supplemental fuel, can range from $5,000 to 510,000 annually <br />Upon approval of the RAWP, a detailed cost estimate will be provided to Nomellini Construction <br />Company The opportunity to provide this service is greatly appreciated If you have any questions <br />or comments, please contact our office at (209) 956-0264 <br />Sincerely, <br />A(Ivanced GeoEnvironmental, Inc <br />Timothy J Cuellar <br />Staff Geologist <br />Enclosures <br />cc (2) addressee <br />(0 <br />Bob Marty- <br />Project <br />artyProject Geologist/Direct <br />