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WASTE DISCHARGE REQUTAENTS NO. -6- OWENS-BROCKWAY OWENS-ILLINOIS GLASS FURNACE FACILITY SAN JOAQUIN COUNTY 7. The pond 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. 8. 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. 9. On or about 15 October each year, available pond storage capacity shall at least equal the volume necessary to comply with Discharge Specifications No. 7 and 8. 10. Treated process wastewater discharged to the process wastewater ponds shall not exceed a specific conductivity value of 1,800 µmhos/cm. Compliance with this Discharge Specification shall be implemented within two years of the date of this Order. In the meantime, the Discharger shall use best management practices to reduce the amount of salts entering the wastewater, and to maintain compliance with all other Prohibitions and Specifications contained within this Order. C. Solids Disposal Requirements: 1. Collected screenings, sludge, and other solids removed from liquid wastes shall be disposed of in a manner approved by the Executive Officer, and consistent with Consolidated Regulations for Treatment, Storage, Processing, or Disposal of Solid Waste, as set forth in Title 27, CCR, Division 2, Subdivision 1, Section 20005, et seq. 2. Any proposed change in sludge use or disposal practice from a previously approved practice shall be reported to the Executive Officer and U.S. Environmental Protection Agency(EPA) Regional Administrator at least 90 days in advance of the change. 0 3. Septic tank cleanings shall be performed only l y a duly authorized service. 4. If the State Water Resources Control Board and the Regional Water Resources Control Board are given the authority to implement regulations contained in 40 CFR 503, this Order may be reopened to incorporate appropriate time schedules and technical standards. The Discharger shall comply with the standards and time schedules contained in 40 CFR 503 whether or not they have been incorporated into this Order. D. Groundwater Limitations: 1. The discharge, in combination with other sources, shall not cause underlying groundwater to contain waste constituents in concentrations statistically greater than background water quality, except for coliform. For coliform, increases shall not cause the most probable number of total coliform organisms to exceed 2.2/100 ml over any 7- day period.