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i? <br /> 'E <br /> page 2, 1207 Aurora Street <br /> i JJW proposed to address remediation of the vadose zone soil contamination at this site <br /> with ozone sparging at a depth of 35 feet bsg. SJCIEHD is onlyifamiliar with the use of i <br /> ozone sparging in the remediation of contaminated gro'u' ndwater'. Assuming the release <br /> occurred from the bottoms of the UST's at approximately i15 feet bsg,lia 20-foot thick <br /> impacted vadose zone is the target of the proposed remedial action. Please provide to <br /> SJCIEHD documentation of successful use of ozone sparging for remediation of vadose <br /> f zone soil contamination, including both pre- and post-remediation soil analysis data. The <br />[ documentation should include the site conceptual models for the sites so remediated. <br /> li <br /> Please submit the requested information as soon as possible so that(review of the <br /> proposed corrective action may resume. if you have any questions o'r' comments please <br /> call Lori Duncan at (209) 468-0337. I <br /> Donna Heran, REHS, Director <br /> Environmental Health Department <br /> t <br /> ii <br /> Lori Duncan, Senior REHS j Nuel C. Henderson, Jr., R <br /> LOP/Site Mitigation Unit IV l� LOP/Site Mitigation Unit IV . <br /> cc: James Barton, CVRWQCB , <br /> Mark Jerpbak, JJW <br /> ii <br /> r- <br />