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page 2, 24100 Lammers <br /> In correspondence dated January 27, 2003, SJCI HD conditionally approved "Work Plan <br /> --- - - Excavation and Monitoring Well Installation"dated December.l0, 2002, also.submitted by.__. <br /> MJK on your behalf. Installation of the monitoring Wells. discussed in the Report <br /> completes a portion of this work pian. Over-excavation of up to approximately 1400 cubic <br /> yards of both uncontaminated and contaminated s it must be completed to finish <br /> implementation of the approved work plan. Please schedule this work. As previously <br /> discussed, soils must be segregated, clean from d rty, during the over-excavation process, <br /> and less expensive options for remediation of the contaminated soil, such as onsite <br /> aeration, are available and should be explored. M nitoring well MW-4 appears to be in <br /> the path of the soil plume and will likely need to be destroyed prior to the over-excavation, <br /> and reinstalled afterwards. SJCIEHD recommend 3 installing a new well approximately <br /> 20-25 feet east of the MW-5/MW-1 05 cluster, to place it more in line with the down- <br /> gradient groundwater flow direction and apparent As of impacted soil. A contingency <br /> plan for dewatering-the excavation should be in place in case this becomes an issue. The <br /> addition of an oxygen-releasing compound to the open excavation prior to backfilling has <br /> been removed from the work plan due to cost considerations, and has SJCIEHD approval. <br /> The deadline for final implementation of the over-E xcavation portion of the work plan is <br /> February 25, 2005. <br /> If you have any questions please call Lori Duncan at (209) 465-0337. <br /> Donna Heran, REHS, Director <br /> Environmental Health Department <br /> t oL,•-. ��r� <br /> Lori Duncan, Senior REHS Nuel C. Henderson, Jr., RG <br /> LOP/Site Mitigation Unit IV LOP/Site Mitigation Unit IV <br /> cc: James Barton, CVRWQCB <br /> Mike Kloberdanz, MJK <br />