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WASTE DISCHARGE REQUIREMENTS ORDER R5-2012-0105 16 <br /> DIAMOND PET FOOD PROCESSORS OF RIPON, LLC AND <br /> RIPON COGENERATION, LLC <br /> DIAMOND PET FOOD RIPON FACILITY <br /> SAN JOAQUIN COUNTY <br /> 4. Storm water collected from paved areas and roof down-spouts may be discharged into <br /> the ASBs or Ponds 1 through 4. <br /> 5. The discharge shall remain within the permitted waste treatment/containment <br /> structures and land application areas at all times. <br /> 6. The Dischargers shall operate all systems and equipment to optimize the quality of the <br /> discharge. <br /> 7. Objectionable odors originating at the facility shall not be perceivable beyond the limits <br /> of the property at an intensity that creates or threatens to create nuisance conditions. <br /> 8. As a means of discerning compliance with Discharge Specification B.7, the dissolved <br /> oxygen (DO) content in the upper one foot of any wastewater pond shall not be less <br /> than 1.0 mg/L for three consecutive weekly sampling events. If the DO in any single <br /> pond is below 1.0 mg/L for three consecutive sampling events, the Dischargers shall <br /> report the findings to the Central Valley Water Board in writing within 10 days and shall <br /> include a specific plan to resolve the low DO results within 30 days. <br /> 9. The wastewater ponds/basins shall be designed, constructed, operated, and <br /> maintained to prevent inundation or washout due to floods with a 100-year return <br /> frequency. <br /> 10. The Discharger shall operate and maintain all ponds sufficiently to protect the integrity <br /> of containment dams and berms and prevent overtopping and/or structural failure. <br /> Unless a California-registered civil engineer certifies (based on design, construction, <br /> and conditions of operation and maintenance) that less freeboard is adequate, the <br /> operating freeboard in any pond shall never be less than two feet(measured vertically <br /> from the lowest possible point of overflow). As a means of management and to discern <br /> compliance with this requirement, the Discharger shall install and maintain in each <br /> pond a permanent staff gauge with calibration marks that clearly show the water level <br /> at design capacity and enable determination of available operational freeboard. <br /> 11 The wastewater treatment, storage and land application system shall have sufficient <br /> capacity to accommodate allowable wastewater flow, design seasonal precipitation, <br /> and ancillary inflow and infiltration during the winter while ensuring continuous <br /> compliance with all requirements of this Order. Design seasonal precipitation shall be <br /> based on total annual precipitation using a return period of 100 years, distributed <br /> monthly in accordance with historical rainfall patterns. <br /> 12. On or about 1 October of each year, available pond storage capacity shall at least <br /> equal the volume necessary to comply with Discharge Specifications B.10 and B.11. <br /> 13. All ponds and open containment structures shall be managed to prevent breeding of <br /> mosquitoes. Specifically: <br /> a. An erosion control program shall be implemented to ensure that small coves <br /> and irregularities are not created around the perimeter of the water surface. <br /> b. Weeds shall be minimized through control of water depth, harvesting, or <br /> herbicides. <br />