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Due to the limitations of these ex situ pump and treat options, GHH also examined the feasibility <br /> of installing an in situ ozone/air injection treatment system,the KVA C-Sparger System. After <br /> comparing the potential effectiveness and estimated costs associated with the C-Sparger and ex <br /> situ treatment options, GHH has concluded that the C-Sparger System presents the preferred <br /> treatment option for this site. Based on discussions with other regulators and consultants, GHH <br /> feels that this in-situ system could be effective at substantially reducing concentrations of <br /> petroleum hydrocarbons and fuel oxygenates at the JAMAR site. Additional information about <br /> the C-Sparger System is enclosed. <br /> As this represents a change in course from the original intent to install a pump and treat system at <br /> the JAMAR site, GHH is requesting approval from SJC/EHD to move forward with a work plan <br /> for installation of an in situ C-Sparger System. Also, to allow for sufficient time to generate a <br /> detailed workplan for this system, GHH is requesting an extension of the October 17 due date to <br /> October 31, 2003. <br /> This letter was written by Ms. Linda Cramer, Senior Staff Engineer, under the direction of Mr. <br /> Thomas E. Ballard, Principal Geologist. If you have any questions, please contact Mr. Ballard at <br /> (530) 886-3100. <br /> Thank You, <br /> C" <br /> Linda Cramer <br /> Senior Staff Engineer �PED GFOZO <br /> THOMAS E.BALLARD/ <br /> Thomas E. Ballard, R.G. NO.7299 <br /> Project Manager N-7 Pc'�Q <br /> SOF CpLlFO <br /> PC: Mr. Jay McIlrath, JAMAR <br /> FA51MC\1n\WkpinExd1eg100903 <br />