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WASTE DISCHARGE REQUIREMENTS ORDER NO.R5-2002-0148 -22- MUSCO FAMILY OLIVE COMPANY AND THE STUDLEY COMPANY WASTEWATER TREATMENT AND LAND DISPOSAL FACILITY SAN JOAQUIN COUNTY 5. As a means of discerning compliance with Discharge Specification No. B.4, the wastewater from 1 to 2 feet below the surface of the 1-million and 84-million gallon ponds shall maintain the following at all times: a. A dissolved oxygen concentration greater than 2 mg/l; b. A dissolved sulfide concentration less than 0.1 mg/1; and c. A pH between 7.5 and 8.5 standard pH units. 6. The discharge to conveyance systems, settling basins, ponds, or land application areas not adequately maintained to prevent off-site odor nuisance, fly breeding, or mosquito breeding is prohibited. 7. All storage ponds shall be managed to prevent breeding of mosquitoes. 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 8. Any ponds and the land application system shall have sufficient capacity to accommodate allowable wastewater flow, design seasonal precipitation, and 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. 9. 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. 10. 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.9 and B.10. 11. The Discharger shall operate all systems and equipment to maximize treatment of wastewater and optimize the quality of the discharge. 12. The Discharger's wastewater treatment system and land application system shall be designed, constructed, operated, and maintained to prevent inundation or washout due to floods with a 100-year return frequency. C. Effluent Limitations 1. Wastewater discharged into the 1-million gallon settling pond shall not exceed the following interim effluent limits. Upon completion of the site-specific background groundwater quality study described in the Provisions, the Discharger may submit a Report of Waste Discharge requesting modified effluent limitations.