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WASTE DISCHARGE REQUIREMENTS ORDER NO.98-217 • -4- <br /> COUNTY OF SAN JOAQUIN <br /> COUNTY SERVICE AREA NO. 31 <br /> FLAG CITY WASTEWATER TREATMENT AND DISPOSAL FACILITY <br /> SAN JOAQUIN COUNTY <br /> 5. The effluent from the treatment facility to the EP pond shall not exceed the following limits: <br /> Monthly Daily <br /> Constituent Units Average Maximum <br /> BOD5I mg/l 30 45 <br /> Settleable Solids ml/l 0.1 0.5 <br /> 1 Five-day,20°Celsius Biochemical Oxygen Demand. <br /> 6. Ponds shall not have a pH less than 6.5 or greater than 8.5. <br /> 7. Ponds shall be managed to prevent breeding of mosquitoes. In particular, <br /> a. An erosion control program should assure that small coves and irregularities are not <br /> created around the perimeter of the water surface. <br /> b. Weeds shall be minimized through control of water depth, harvesting, or herbicides. <br /> C. Dead algae, vegetation, and debris shall not accumulate on the water surface. <br /> 8. Public contact with wastewater shall be precluded through such means as fences, signs, and <br /> other acceptable alternatives. <br /> 9. Ponds shall have sufficient capacity to accommodate allowable wastewater flow and design <br /> seasonal precipitation and ancillary inflow and infiltration during the nonirrigation season. <br /> Design seasonal precipitation shall be based on total annual precipitation using a return period <br /> of 100 years, distributed monthly in accordance with historical rainfall patterns. <br /> 10. Pond freeboard shall never be less than two feet (measured vertically to the lowest point of <br /> overflow). <br /> 11. On or about 1 October of each year, available pond storage capacity shall at least equal the <br /> volume necessary to comply with Discharge Specification No. 9. <br /> C. Solids Disposal. <br /> 1. Collected screenings, sludges, and other solids removed from liquid wastes shall be disposed <br /> of in a manner that is consistent with Title 27, Division 2, Subdivision 1 of the California <br /> Code of Regulations and approved by the Executive Officer. <br /> 2. Any proposed change in sludge or solids use or disposal practice from a previously approved <br /> practice shall be reported to the Executive Officer at least 90 days in advance of the change. <br />