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WASTE DISCHARGE REQUIREMENTS ORDER NO. R5-2002-0220 -8- TEICHERT AGGREGATES TRACY ROCK PLANT SAN JOAQUIN COUNTY 5. The Discharger shall operate all systems and equipment to maximize treatment of the wastewater and optimize the quality of the discharge. 6. All 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. 7. The Discharger's wastewater system shall be designed, constructed, operated, and maintained to prevent inundation or washout due to floods with a 100-year return frequency. 8. All stockpiled products shall be managed to prevent erosion of sediment to surface water drainage courses. 9. The freeboard in all ponds shall never be less than two feet as measured vertically from the water surface to the lowest point of overflow. 10. The wastewater ponds shall have sufficient capacity to accommodate allowable wastewater flow and design seasonal precipitation. Design seasonal precipitation shall be based on total annual precipitation using a return period of 100 years, distributed monthly in accordance with the historical rainfall patterns. 11. Newly constructed or rehabilitated levees or berms designed to hold back water shall be designed and constructed under the direct supervision of a California Registered Civil Engineer. 12. On or about 1 November of each year, available pond storage capacity shall at least equal the volume necessary to comply with Discharge Specifications B.9 and B.10. 13. Neither the treatment nor the discharge shall cause a nuisance or condition of pollution as defined by the California Water Code, Section 13050. 14. The discharge shall not cause the degradation of any water supply. 15. The Discharger shall comply with all applicable sections of the Aboveground Petroleum Storage Tank Regulations (Section 25270, Health and Safety Code). C. Effluent Limitations 1. The waste shall not have a pH of less than 6.5 or greater than 8.5.