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CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION MONITORING AND REPORTING ORDER NO. R5-2011-0815 CALIFORNIA WATER CODE SECTION 13267 FOR DIAMOND FOODS INC. 1050 SOUTH DIAMOND STREET, STOCKTON SAN JOAQUIN COUNTY This Order is issued to Diamond Foods Inc. (hereafter Discharger) pursuant to California Water Code section 13267, which authorizes the Executive Officer of the California Regional Water Quality Control Board, Central Valley Region (hereafter Central Valley Water Board) to issue a Monitoring and Reporting Order (Order). The Executive Officer finds: INTRODUCTION 1. The Discharger owns and operates a walnut processing facility and a 4.5 megawatt co-generation plant located at 1050 South Diamond Street in Stockton, San Joaquin County (Site). The Discharger is responsible for releases at the Site. 2. The Site is about 20 acres in surface area and shares its northern border with the Union Pacific Railroad company's right-of-way. The Discharger pre-treats its process wastewater prior to disposal to the City of Stockton sewer. A former onsite cooling tower used anti-scaling solutions that contained chromium. Site investigations have shown the presence of total and hexavalent chromium in soil and groundwater, which occurs between 45 and 55 feet below ground surface (bgs). This pollution has impacted the beneficial use of groundwater resources at the Site. 3. The Discharger completed an environmental site assessment in 1988 and removed multiple tanks/vaults in 1990. The Discharger has submitted quarterly groundwater monitoring reports since 1990. 4. This revised Monitoring and Reporting Order is issued by the Central Valley Water Board, pursuant to California Water Code (CWC) section 13267 and is necessary to delineate groundwater pollutant plumes and to assist in data collection for future groundwater remediation efforts. 5. Existing data and information about the Site show the presence of various chemicals, including total and hexavalent chromium, aluminum, calcium, chloride, and volatile organic compounds (VOCs), emanating from the property as a result of the Discharger's past operation at the Site. 6. The Discharger shall not implement any changes to this Order unless and until a revised Order is issued by the Executive Officer. This Monitoring and Reporting Order replaces the requirements listed in Order No. R5-2004-0840, which was issued on 24 November 2004. 7. Prior to construction of any new groundwater monitoring or extraction wells, and prior to destruction of any groundwater monitoring or extraction wells, the Discharger shall submit plans and specifications to the Central Valley Water Board for review and