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WASTE DISCHARGE REQUtMEMTS ORDER NO. 5-00-142 -8- CITY OF ESCALON ESCALON WASTEWATER TREATMENT FACILITY SAN JOAQUIN COUNTY 5. The effluent contained in the industrial evaporation/percolation ponds shall not exceed the following limits. Constituent Units Monthly Average BODS mg/1 150 6. Objectionable odors originating at this facility shall not be perceivable beyond the limits of the wastewater treatment facility. 7. As a means of discerning compliance with Discharge Specification No. B.6, the dissolved oxygen content shall not be less than 1.0 mg/1 in any pond at any time, as measured at a point at as far as practical from the pond inlet and within one foot of the water surface. 8. The discharge to conveyance systems, settling basins, ponds, or land disposal areas not adequately maintained to prevent off-site odor nuisance, fly breeding, or mosquito breeding is prohibited. 9. The treatment facilities shall be designed, constructed, operated, and maintained to prevent inundation or washout due to floods with a 100-year return frequency. 10. The pond system shall have sufficient capacity to accommodate allowable wastewater . flow, design seasonal precipitation, seasonal ancillary inflow, and infiltration during the wet season. Design seasonal precipitation shall be based on total annual precipitation using a return of 100 years, distributed monthly in accordance with historical rainfall patterns. 11. Pond freeboard shall never be less than two feet in any pond as measured vertically from the water surface to the upper surface of the lowest adjacent dike or levee. 12. On or about 1 November each year, available pond storage capacity shall at least equal the volume necessary to comply with Discharge Specifications No. B.10 and B.11. C. Solids Disposal Requirements: 1. Collected screenings, sludge, and other solids removed from liquid wastes shall be disposed of in a manner approved by the Executive Officer, and consistent with Consolidated Regulations for Treatment, Storage, Processing, or Disposal of Solid Waste, as set forth in Title 27, CCR, Division 2, Subdivision 1, Section 20005, et seq. 2. Any proposed change in sludge use or disposal practice from a previously approved practice shall be reported to the Executive Officer and U.S. Environmental Protection Agency(EPA) Regional Administrator at least 90 days in advance of the change.