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page 2,6131 Pacific Avenue <br /> Cambria has recommended conducting additional DPE, followed by preparation of a <br /> corrective action plan (CAP). As stated previously, SJC/EHD conditioned that the DPE <br /> interim remediation continue until analysis of extracted vapor indicate that it has lost <br /> effectiveness for removing the core of the remaining soil contamination. This directive <br /> still stands; the site is technically out of compliance for ignoring it. Per California Code of <br /> Regulations, Title 23, Division 3, Chapter 16 section 2725, a feasibility study must be <br /> conducted which compares a minimum of two remedial alternatives for ability to mitigate <br /> the sites contamination and for cost effectiveness. Cambria proposed DPE as interim <br /> remediation based on a previous feasibility study. If this feasibility study did not <br /> compare two remedial alternatives or provide enough information for Cambria to make a <br /> full assessment, then another must be prepared to be included in the CAP. <br /> SJC/EHD approved interim remediation proposed by Fugro West in 1994 of 'over <br /> purging' monitoring well MW-3 of 40-50 gallons of water following each quarterly <br /> groundwater monitoring and sampling event. Apparently this over purge has continued <br /> to the present time, though documentation of it has not been made on a continuous <br /> basis, and the well it is conducted on was abruptly changed to MW-4 starting with first <br /> quarter 2004. SJC/EHD recommends this interim remediation cease unless it can be <br /> shown to have continued effectiveness and value, however neither MW-3 nor MW-4 <br /> currently have high concentrations of contaminants. <br /> Please proceed with continuation of the DPE interim remediation and submittal of a <br /> CAP. The DPE interim remediation should resume immediately; the CAP is due for <br /> submittal no later than July 8, 2005. <br /> If you have any questions please call Lori Duncan at (209) 468-0337. <br /> Donna Heran, REHS, Director <br /> Environmental Health Department <br /> Lori Duncan, Senior REHS Nuel C. Henderson, Jr., PG <br /> LOP/Site Mitigation Unit IV LOP/Site Mitigation Unit IV <br /> cc: James Barton, CVRWQCB <br /> Joe Neely, Cambria <br />