COMPLIANCE INFO_PR0440063_1990-2019

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1-4101INCaliforniaegional Water Quality ConMol Board Qa; Central Valley Region Robert Schneider,Chair Linda S.Adams Arnold Secretaryfor Sacramento Main Office Schwarzenegger Environmental 11020 Sun Center Drive#1200,Rancho Cordova,California 9567461 14 Governor Protection Phone(916)464-3291 •FAX(916)464-4645 http://www.waterboards_ca.gov/centralvalley To: Musco Family Olive Co. FROM: Todd Del Frate Engineering Geologist Lower San Joaquin River DATE: 27 July 2006 Watershed SIGNATURE: SUBJECT: REVIEW OF DETECTION MONITORING PROGRAM FOR GROUNDWATER, CLASS 11 SURFACE IMPOUNDMENTS, MUSCO FAMILY OLIVE COMPANY, TRACY, FACILITY NO. 5B392059001 Board staff (staff) has reviewed the Detection Monitoring Program (DMP) for the Class II Surface Impoundments at the Musco Family Olive Company (Musco) in Tracy. Monitoring wells W-2, MW-11, and MW-17 were installed to monitor the shallow ground water beneath the site. These wells are located in the vicinity of the southern end of Pond A and Pond B. Monitoring wells MW-12 and MW-18 were installed to monitor deep ground water and are at the northern and southern ends of Pond B, respectively. The purpose of this evaluation was to determine if the DMP is meeting the requirements of Title 27 and Waste Discharge Requirements (WDRs) No. R5-2005-0024. Monitoring wells MW-11 and W-2 are essentially dry and consequently the Discharger has not been able to collect groundwater samples from these wells as required by WDR No. R5-2005-0024. As discussed in the staff letter dated 28 April 2006, it is our opinion the DMP is not sufficient to meet the requirements of Title 27 Section 20415 and 20420 and WDR No. R5-2005-0024. Title 27 subsection 20415 requires the following for a detection monitoring program under section 20420: • (B)1. a sufficient number of Monitoring Points (as defined in section 20164) installed at appropriate locations and depths to yield ground water samples from the uppermost aquifer that represent the quality of ground water passing the Point of Compliance and to allow for the detection of a release from the Unit; • (B)2. a sufficient number of Monitoring Points installed at additional locations and depths to yield ground water samples from the uppermost aquifer to provide the best assurance of the earliest possible detection of a release from the Unit; • (B)3. a sufficient number of Monitoring Points and Background Monitoring Points installed at appropriate locations and depths to yield ground water samples from portions of the zone of saturation, including other aquifers, not monitored pursuant to California Environmental Protection Agency 01 Recycled Paper