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. 07 November 2004 <br /> AGE-NC Project No 96-0232 <br /> Page 5 of 11 <br /> Because MTBE is well below the EPA recommended 100 atmospheres, air sparging would be <br /> considered ineffective as a remediation alternative <br /> Another concern with IAS is precipitation of iron and/or manganese, which can cause clogging of <br /> sparging points Laboratory analysis of iron at the site (Appendix B) indicated that iron <br /> concentrations in ground water at the site are adequate for IAS <br /> 415 Duration <br /> Air sparging conducted in non-conducive conditions generallyresult in extensive remediation rates <br /> At the site, we would estimate an extended remediation period of at least 48 to 60 months for <br /> remediation of MTBE-impacted ground water <br /> 4 1 6 Estimated Cost <br /> • Installation of an IAS system would most likely require the installation of one to two additional IAS <br /> wells located near well MW-8,installation of several SVE wells,installation of an SVE/IAS piping <br /> system and installation of SVE/IAS equipment SVE/IAS setup costs would likely range from <br /> $50,000 to $75,000 Spargmg equipment, utility, maintenance and monitoring would range from <br /> $5,000 to $10,000 annually Based upon a treatment period of 48-60 months, the total costs would <br /> be in the range of$70,000 to $125,000 <br /> 42 IN-SITU OZONE SPARGING <br /> IOS utilizes ozone injection to destroy organic chemicals through the process of chemical oxidation, <br /> which breaks the targeted organic chemical down into carbon dioxide and water Ozone is a highly <br /> reactive chemical that has proven to be effective in destroying a wide variety of organic chemicals <br /> including MTBE <br /> 4 2 1 Principles <br /> Ozone sparging is generally introduced to the subsurface as a gas phase through traditional air sparge <br /> wells Ozone is a relatively unstable molecule comprised of three oxygen atoms(03),the instability <br /> means that ozone will have a short life-span and will degrade rapidly(generallyjust a few minutes) <br /> Because of its instability, ozone cannot be generated and stored for future use, rather, it must be <br /> generated and immediately used for IOS treatment <br /> Advanced GeoE nviron mental,Inc <br />