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WASTE DISCHARGE REQUIR _ENTS ORDER NO. 5-01-055 -8- TRI VALLEY GROWERS PLANT NO. 4 STOCKTON, SAN JOAQUIN COUNTY 3. As a means of discerning compliance with Discharge Specification No. B.2, 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. 4. 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. 5. 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. 6. Any ponds and the land application 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. 7. 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. 8. 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.6 and B.7. 9. The Discharger shall operate all systems and equipment to maximize treatment of wastewater and optimize the quality of the discharge. 10. The Discharger's wastewater treatment system and land disposal system shall be designed, constructed, operated, and maintained to prevent inundation or washout due to floods with a 100-year return frequency. 11. No physical connection shall exist between wastewater piping and any domestic water supply or other domestic/industrial supply well without an air gap or approved reduced pressure device. 12. Hydraulic loading of wastewater shall be at reasonable agronomic rates designed to minimize percolation below the root zone (i.e., deep percolation). 13. The maximum BODS loading to the land application areas shall not exceed the numerical limits presented in Section C, or the maximum loading rate that environmental conditions permit at the time of the application without violating the terms of this Order, whichever is less.