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WASTE DISCHARGE REQUIREMENTS ORDER NO. -5- TEICHERT AGGREGATES AND CALAVERAS MATERIALS, INC. TRACY ROCK PLANT AND FLINTKOTE SETTLING PONDS SAN JOAQUIN COUNTY 4. The discharge shall remain within the designated disposal area at all times. Wastewater shall not be discharged to areas not referred to in Finding No. 8. 5. 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. 6. The wastewater treatment ponds shall not have a pH of less than 6.5 or greater than 8.5. 7. The Discharger shall operate all systems and equipment to maximize treatment of the wastewater and optimize the quality of the discharge. 8. The 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. 9. 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. 10. All stockpiled products shall be managed to prevent erosion of sediment to surface water drainage courses. 11. 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. 12. The wastewater ponds shall have sufficient capacity to accommodate allowable wastewater flow, design seasonal precipitation, and ancillary inflow and infiltration. 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. 13. On or about 1 November of each year, available ponds storage capacity shall at least equal the volume necessary to comply with Discharge Specifications B.11 and B.12. 14. The Discharger shall comply with all applicable sections of the Aboveground Petroleum Storage Tank Regulations (Section 25270, Health and Safety Code). 15. Only domestic wastewater shall be discharged to the domestic wastewater treatment system (septic system). 16. Septage generated in the septic tank shall be discharged to a permitted municipal wastewater treatment or equivalent facility. All transportation of septage or other wastewater shall be performed by a duly authorized service. 17. The Discharger shall comply with storm water discharges at the site which are regulated under the State Water Resources Control Board (SWRCB) Water Quality Order No. 97-