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WASTE DISCHARGE REQUIREMENTS ORDER R5-2013-0028 -31- <br /> DELICATO VINEYARDS, INC. <br /> DELICATO FAMILY VINEYARDS <br /> SAN JOAQUIN COUNTY <br /> 9. The Discharger shall operate and maintain all wastewater ponds sufficiently to <br /> protect the integrity of containment dams and berms and prevent overtopping <br /> and/or structural failure. For ponds lined with geosynthetic (plastic) material, the <br /> operating freeboard in any pond shall never be less than one foot (measured <br /> vertically from the lowest possible point of overflow). For unlined or clay lined <br /> ponds with berms that are higher than the surrounding grade, the operating <br /> freeboard shall never be less than two feet. As a means of management and to <br /> discern compliance with this requirement, the Discharger shall install and <br /> maintain in each pond a permanent staff gauge with calibration marks that clearly <br /> show the water level at design capacity and enable determination of available <br /> operational freeboard. <br /> 10.The treatment, storage, and disposal ponds or structures shall have sufficient <br /> capacity to accommodate allowable wastewater flow, design seasonal <br /> precipitation, and ancillary inflow and infiltration during the winter while ensuring <br /> continuous compliance with all requirements of this Order. Design seasonal <br /> precipitation shall be based on total annual precipitation using a return period of <br /> 100 years, distributed monthly in accordance with historical rainfall patterns. <br /> 11.All ponds and open containment structures shall be managed to prevent <br /> breeding of mosquitoes. Specifically: <br /> a. An erosion control program shall be implemented to ensure that small <br /> coves and irregularities are not created around the perimeter of the <br /> water surface. <br /> b. Weeds shall be minimized through control of water depth, <br /> harvesting, or herbicides. <br /> C. Dead algae, vegetation, and debris shall not accumulate on the <br /> water surface. <br /> d. The Discharger shall consult and coordinate with the local Mosquito <br /> Abatement District to minimize the potential for mosquito breeding as <br /> needed to supplement the above measures. <br /> 12.Newly constructed or rehabilitated berms or levees (excluding internal berms that <br /> separate ponds or control the flow of water within a pond) shall be designed and <br /> constructed under the supervision of a California Registered Civil Engineer. <br /> 13.Wastewater discharged to the LAAs shall not have a pH less than 4.5 or greater <br /> than 10.0. <br /> 14.The Discharger shall monitor sludge accumulation in the aeration ponds at least <br /> every five years beginning in 2018, and shall periodically remove sludge as <br /> necessary to maintain adequate storage capacity. Specifically, if the estimated <br /> volume of sludge in any pond exceeds 20 percent of the permitted pond capacity, <br />