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WASTE DISCHARGE REQUIREMENTS ORDER NO. R5-2008-0148 -23- LAWRENCE LIVERMORE NATIONAL SECURITY, LLC AND THE U.S. DEPARTMENT OF ENERGY FOR LAWRENCE LIVERMORE NATIONAL LABORATORY SITE 300 SAN JOAQUIN AND ALAMEDA COUNTIES 6. The Discharger shall implement the BMPs for low threat discharges identified in Attachment 4. 7. Adequate freeboard must be maintained in the sewage evaporation pond to prevent over-topping or erosion of the pond embankment which may threaten the integrity of the pond. 8. When discharge to a percolation pit is diverted during maintenance activities, the Discharger shall prevent the discharge from entering any surface water drainage courses. 9. Discharges to the sewage ponds and the percolation pits shall not have a pH less than 5.0 or greater than 10.0. C. SCREENINGS, SLUDGES, AND SOLIDS MANAGEMENT AT THE SEWAGE PONDS 1. Collected screenings, sludges, and other solids removed from liquid wastes shall be disposed of in a manner that is consistent with CCR Title 27, Division 2, Section 20220(c) and Title 23, Division 3, Chapter 15 and approved by the Executive Officer. 2. Any proposed change in sludge use or disposal practice from a previously approved practice shall be reported to the Executive Officer at least 90 days in advance of the change. 3. Use and disposal of sewage sludge shall comply with existing Federal and State laws and regulations, including permitting requirements and technical standards included in 40 CFR 503. 4. If the State Water Board and the Regional Water Boards 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 must comply with the standards and time schedules contained in 40 CFR 503 whether or not they have been incorporated into this Order. 5. The Discharger shall submit an annual report describing the quantity of sludge removed from wastewater management units and the manner and location of disposal. This report is not required in years when no screenings, sludge, or solids have been removed.