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t WASTE DISCHARGE REQUIREMENTS DEGROOT AND SONS, A&J FOODS, INC. , AND CHIRON CORPORATION WASTEWATER DISPOSAL TO LAND SAN JOAQUIN COUNTY -4- 9. Ponds shall be managed to prevent breeding of mosquitos. In particular, a. An erosion control program should assure that small coves and irregularities are not created around the perimeter of the water surface. b. Weeds shall be minimized through control of water depth, harvesting, or herbicides. c. Dead algae, vegetation, and debris shall not accumulate on the water surface. 10. Ponds shall have sufficient capacity to accommodate allowable wastewater flow and design seasonal precipitation and ancillary inflow and infiltration during the nonirrigation season. Design seasonal precipitation shall be based on total annual precipitation using a return period of 100 years, distributed monthly in accordance with historical rainfall patterns. Freeboard shall never be less than 2 feet (measured vertically) . 11 . On or about 1 October of each year, available pond storage capacity shall at least equal the volume necessary to comply with Discharge Specification B. 11 . C. Sludge Disposal Specifications: 1. Collected screenings, sludges, and other solids removed from liquid wastes shall be disposed of in a manner that is consistent with Chapter 15, and maintain and operate under a Sludge Management Plan approved by the Executive Officer. 2. Any proposed change in sludge use or disposal practice shall be reported to the Executive Officer at least 90 days in advance of the change. D. Ground Mater Limitations: 1 . The discharge, in combination with other sources, shall not cause underlying ground water to be degraded. These requirements may be reopened to include additional ground water limitations. E. Provisions: 1 . The Discharger shall comply with the Monitoring and Reporting Program No. , which is part of this Order, and any revisions thereto as ordered by the Executive Officer.