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EDMUND G. BROWN JR. <br /> r OOVEPNOR <br /> CA6tPOWtItA MATTHEW RODRIQUEZ <br /> Water oars E <br /> ENNVIRONMEVIRONME FORNTAL PROTECTION <br /> Central Vallejo Regional Water Quality Control Board <br /> SEP 0 12016 <br /> 29 August 2016 <br /> EWRONUENTAL HTfi <br /> Dennis Leikem PERMIVSEERVICES <br /> Environmental Manager <br /> Musco Family Olive Company <br /> 17950 Via Nicolo <br /> Tracy, CA 95377 <br /> REVIEW OF DETECTION MONITORING PROGRAM EVALUATION REPORT AND WORK <br /> PLAN, MUSCO FAMILY OLIVE COMPANY, SAN JOAQUIN COUNTY <br /> The Class II Surface Impoundments at the Musco Family Olive Company are regulated by <br /> Waste Discharge Requirements (WDRs) Order R5-2015-0125. Central Valley Water Board <br /> staff has reviewed the Detection Monitoring Program (DMP) Evaluation and Work Plan to install <br /> additional groundwater wells and one suction lysimeter beneath Pond B, and the proposal to <br /> decommission well MW-34 as required under WDR R5-2015-0125. Staff comments are below. <br /> Detection Monitoring Program Evaluation <br /> Finding 28 of the WDRs states that wells MW-12 and -17 are required to be reconstructed to <br /> proper depths to bring those Detection Monitoring Network (DMN) wells into compliance with <br /> Title 27. The DMP Evaluation does not address these wells. Furthermore, based on declining <br /> water levels in well MW-22, staff also recommends that this well be reconstructed to proper <br /> depths of the intermediate zone. Consequently, to assure compliance with the WDRs and the <br /> DMP described in Title 27, Section 20415, wells MW-12, -17, and -22 should be deepened or an <br /> entirely new well installed adjacent to the existing well, with screen intervals set at depths <br /> similar to wells -18R, -20R, and -21 R. <br /> Proposed Scope of Work for DMP <br /> To address current deficiencies of the DMP for Ponds B, C, and D, Musco proposes to advance <br /> additional borings and construct monitoring devices at locations to better define groundwater <br /> flow direction and groundwater quality. This proposed scope of work is summarized below. <br /> Pond B <br /> To address vadose zone monitoring beneath Pond B, Musco proposes to replace lysimeter 36 <br /> with one vertical lysimeter to be installed as close to the liner of Pond B and in the vicinity of <br /> current lysimeter 36. This replacement suction lysimeter has been proposed to be located <br /> along the western portion of the northern berm of Pond, and placed approximately 15 feet below <br /> ground surface. <br /> Pond C <br /> Musco proposes to install an additional well east of MW-34 to assess the northeast gradient <br /> from the sump of Pond C. If the well installed detects first encountered groundwater at the <br /> elevation of the current well MW-34, then Musco will construct a replacement well and abandon <br /> well MW-34. <br /> KARL E. LONGLEY SCD, P.E.,CHAIR I PAMELA C. CREEDON P.E., BCEE, EXECUTIVE OFFICER <br /> 11020 Sun Center Drive#200,Rancho Cordova,CA 95670 1 www.waterboards.ca.gov/centralvalley <br /> Z�RECYCLED PAPER <br />