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Rodger Liston F <br /> Darpetro Inc. <br /> 749 E. Charter Way, Stockton, California <br /> Page 5 of 5 <br /> The State Water Resources Control Board (SWRCB ) Cleanup Fund has inquired <br /> whether or not it would be more economical to replace the thermal vapor <br /> destruction unit on the soil vapor extraction system with carbon canisters at this <br /> point in the vadose zone remediation effort. Please have your consultant <br /> evaluate this issue and make a recommendation to EHD . The SWRCB Cleanup <br /> Fund may decline reimbursement if thermal vapor destruction cannot be shown <br /> to be more cost-effective than carbon canisters. EHD also recommends that the <br /> hydrocarbon yield from each well on the SVE system be determined so that <br /> ineffective wells can be shut down and focus the system energy on the wells still <br /> yielding significant hydrocarbon mass . <br /> If there is any confusion on any of these issues, please call the undersigned for <br /> clarification , EHD desires to assist you and/or your consultant in this matter as <br /> much as possible. Questions or comments may be directed to Nuel Henderson <br /> by mail (address on letter head ) , or by telephone at (209) 468-3436 . <br /> Donna Heran , REHS , Director <br /> Environmental Health Division <br /> Nuel C . Henderson , Jr. , RG Margaret agorio, REHS <br /> Unit IV - Site Mitigation Unit IV Supervisor <br /> cc: James Barton - CVRWQCB <br /> John Cussen — California Geophysical Group, Inc. <br /> i Mark Owens — SWRCB Cleanup Fund <br /> I Chuck Nichols — USA San Diego LLC <br /> r <br /> E - <br /> i <br /> c <br /> i <br /> i <br /> E <br /> i <br /> r <br /> r — <br /> 4 <br />