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California Regional Water Quality Control Board. <br /> Central Valley Region <br /> QW; Robert Schneider,Chair a <br /> Linda S.Adams Arnold <br /> 5ecretaryfor Sacramento Main Office Schwarzenegger <br /> Environmental E 1020 Sun Center Drive 4200,Rancho Cordova,California 95670-6114 Governor <br /> Protection Phone(916)464-3291 •FAX(916)4644645 <br /> http:t/www.waterboards.ca-gov/centralval ley <br /> nCD <br /> I. <br /> 17 November 2006 �L=,�' ����-; :..'? <br /> NOV � a �ab , <br /> Dennis Leikam ENVIRONAjirP,l H , <br /> Musco Family Olive Company PERlu11;�5ri�'�iL ' <br /> 17950 Via Nicolo <br /> Tracy, California 95377 <br /> '-REVIEW OF-2006 SEMI=ANNUAL MONITORING REPORT FOR THE MUSCO FAMILY <br /> OLIVE COMPANY, TRACY, SAN JOAQUIN COUNTY <br /> The Regional Water Quality Control Board (Regional Water Board) staff has reviewed the <br /> 2006 Semi-Annual Monitoring Report for the Musco Family Olive Company received on <br /> 6 August 2006. The report was prepared in accordance with Monitoring and Reporting <br /> Program (MRP) No. R5-2005-0024. <br /> Staff has reviewed the report and has provided comments with the attached checklist. The <br /> Discharger has failed to establish shallow or deep background groundwater concentrations as <br /> required by Title 27 California Code of Regulations, Division 2 (Title 27), Section-20400(a) and <br /> (b). Additional shallow and deep groundwater monitoring wells were installed in October 2006. <br /> Results are pending. <br /> Upon review of the groundwater analytical data, background groundwater concentrations <br /> cannot be established on the Musco property due to elevated concentrations of constituents of <br /> concern in all shallow onsite wells. However, pursuant to Title 27, Section 20390(a), which <br /> states: For each unit, the RWQCB shall establish a water quality protection standard in the <br /> WDRs. This Water Standard shall consist of the list of constituents of concern (under Section <br /> - <br /> ­20395),—the concentration-limits (under Section 20400), and the Point of Compliance and all <br /> Monitoring Points (under Section 20405). This Water Standard shall apply during the active <br /> life of the Unit, the closure period, the post closure maintenance period, and during any <br /> compliance period (under Section 20410). w <br /> Based upon Section 20390(a), staff is planning to recommend establishing interim Water <br /> Quality Protection Standard (WQPS) for the deep groundwater zone utilizing the data set from <br /> the Regional Well as background groundwater concentrations. The Interim WQPSs for deep <br /> groundwater beneaWthe Musco site are listed in the table below: <br /> California Environmental Protection Agency <br /> a <br /> (o Recycled Paper <br /> J <br />