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‘00 EDMUND G. BROWN JR. <br />GOVERNOR <br /> <br />CALIFORNIA <br />Water Boards <br /> <br />MATTHEW RODRIOLIEZ <br />SECRETARY FOR <br />ENVIRONMENTAL PROTECTION <br />Central Valley Regional Water Quality Control Board <br /> <br />21 June 2018 <br />Fred Jacobus <br />Diamond Foods, Inc. <br />1050 South Diamond Street <br />Stockton, CA 95205 <br />NOTICE OF APPLICABILITY FOR GENERAL ORDER NO. R5-2015-0012-003, IN-SITU <br />REMEDIATION EXTENDED PILOT TEST, DIAMOND FOOD FACILTY, 1050 SOUTH DIAMOND <br />STREET, STOCKTON, SAN JOAQUIN COUNTY <br />Diamond Foods, Inc. (Discharger) submitted a 25 May 2018 Work Plan for Additional Pilot Study <br />Injection Testing for an additional pilot study at the Diamond Foods Facility in Stockton. Two previous <br />pilot studies were conducted under a 26 March 2015 Notice of Applicability (NOA) and a <br />30 November 2016 NOA for coverage under General Order No. R5-2015-0012, General Waste <br />Discharge Requirements for In-situ Groundwater Remediation and Discharge of Treated Groundwater to <br />Land. This NOA and attached Revised Monitoring and Reporting Program R5-2015-0012-003 are <br />issued for the requested additional pilot study testing. <br />Project Location: <br />The project is in San Joaquin County, Township 1N, Range 7E, Section 45, Mount Diablo Baseline & <br />Meridian. Assessor's Parcel No. 155-32-019; Latitude 37°5656.3" N, Longitude 121°15'22.5"W. <br />Project Description: <br />The Diamond Foods facility has been operating as mainly a walnut processing plant since the 1950s. <br />Hexavalent chromium was previously used as corrosion inhibitor for a former cooling tower at the site, and <br />is believed to be the source of hexavalent chromium groundwater impacts immediately north of the main <br />processing building. Based on the results of the two previous pilot tests, the Discharger is proposing to <br />continue with an additional pilot test to affected areas still above water quality objectives for hexavalent <br />chromium. Calcium polysulfide (Cascade®) will be used based on previous bench-scale testing and <br />results from the previous pilot tests. <br />For the additional pilot study, the Discharger proposes to inject approximately 1,050 gallons of 10% <br />calcium polysulfide solution under pressure into groundwater at each of 10 temporary injection borings <br />near wells OBSW-S, OBSW-D, MW-5, and MW-7, as shown on Figure 3 of the attached Revised <br />Monitoring and Reporting Program, Order No. R5-2015-0012-003. Eight of the borings will have <br />temporary screens set at depths from approximately 40 to 55 feet below ground surface (bgs), and two <br />will be set from approximately 55 to 75 feet bgs. The calcium polysulfide is intended to create reducing <br />conditions in the groundwater to convert the hexavalent chromium into trivalent chromium. <br />KARL E. LoNGLEr ScD, P.E., CHAIR I PATRICK PULUPA, EEO., EXECUTIVE OFFICER <br />11020 Sun Center Drive #200, Rancho Cordova, CA 95670 I www.waterboards.ca.gov/centralvalley <br />C) RECYCLED PAPER