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California ^ional Water Quality CoA Board <br /> t (\- Central Valley Region <br /> v Katherine Hart,Chair (a <br /> . Linda S.Adams 11020 Sun Center Drive 0200, Rancho Cordova,California 95670-6114 Arnold <br /> Schwarzenegger <br /> Secretary for Phone(916)464-3291 •FAX(916)464-4645 <br /> Environmental http;//www.watetoarde.ca.gov/centralvalley Governor <br /> Protection <br /> 9 November 2010 <br /> Ben Hall <br /> Musco Family Olive Company <br /> 17950 Via Nicolo <br /> Tracy, Califomia 95377 <br /> CONDITIONAL APPROVAL OF WORK PLAN FOR IMPROVED DETECTION MONITORING <br /> PROGRAM, MUSCO FAMILY OLIVE COMPANY, SAN JOAQUIN COUNTY <br /> The Central Valley Regional Water Quality Control'Board (Central Valley Water Board) staff <br /> has reviewed the Work Plan for Improved Detection Monitoring Program for the Title 27 <br /> Surface Impoundments (Work Plan) regulated under Waste Discharge Requirements (WDRs <br /> Order R5-2005-0024. In a letter dated.9 June 2010, Central Valley Water Board staff <br /> requested the Discharger to address deficiencies of the Detection.Monitoring Program (DMP) <br /> associated with the Class If Surface Impoundments. <br /> The work plan addresses the deficiencies discussed in the 9 June 2010 letter. As we <br /> discussed during the teleconference on 29 October 2010, staff approves the work plan with <br /> the following conditions: <br /> 1. Musco shall install a total of four intermediate zone wells to serve as detection <br /> monitoring wells for the Class II surface impoundments. <br /> 2. Well MW-20R will be moved approximately 150 to 200 feet southeast of its proposed <br /> location. <br /> 3. Another well will be installed approximately 100 to 150 southwest of well MW-18. <br /> 4. Musco shall evaluate a backup well location for the proposed background well <br /> MW-19R. This evaluation is necessary in the event the proposed background well <br /> location does not encounter the intermediate water bearing zone. If intermediate <br /> groundwater is not encountered in boring MW-19R, then Musco shall report their <br /> findings immediately to staff by phone or email. <br /> 5. As proposed in the work plan, Musco shall install intermediate groundwater monitoring <br /> wells that fully penetrate the water bearing zone. The work plan proposes to screen the <br /> entire thickness of the water bearing zone or 20 feet into the water bearing zone, <br /> whichever is smaller, Musco proposes to set three to five feet of screen above the <br /> California Environmental Protection Agency <br /> e*Recycled Paper <br />