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STANDARD PROVISIONS AND REPORTING REQUIREMENTS September 1993 FOR WASTE DISCHARGE REQUIREMENTS FOR DISCHARGES REGULATED BY CHAPTER 15 AND/OR PART 258 -17- 3. The fact that it would have been necessary to halt or reduce the permitted activity in Order to maintain compliance with this Order shall not be regarded as a defense for the discharger's violations of the Order. 4. The discharge shall remain within the designated disposal area at all times. 5. By the effective date of waste discharge requirements, the discharger shall have a plan for preventing and controlling accidental discharges, and for minimizing the effect of such events. This plan shall: a. Identify the possible sources of accidental loss or leakage of wastes from each waste storage, treatment, or disposal unit. b. Evaluate the effectiveness of present waste management units and operational procedures, and identify needed changes or contingency plans. C. Predict the effectiveness of the proposed changes in waste management facilities and procedures and provide an implementation schedule containing interim and final dates when changes will be implemented. The Board, after review of the plan, may establish conditions that it deems necessary to control leakage and minimize its effects. 6. Methane and other landfill gases shall be adequately vented, removed from landfill units, or otherwise controlled to prevent the danger of explosion, adverse health effects, nuisance conditions, or the impairment of beneficial uses of water due to migration through the vadose (unsaturated) zone. 7. During the rainy season a minimum one -foot thickness of low permeability soil or alternative cover, approved by the Board and by the California Integrated Waste Management Board, shall be maintained over all but the active disposal area of the landfill units. The active disposal area shall be confined to the smallest area practicable based on the anticipated quantity of waste discharge and other waste management facility operations. 8. Any direct -line discharge to a surface impoundment shall have fail-safe equipment or operating procedures to prevent overfilling. 9. Surface impoundments shall be designed, constructed and maintained to prevent scouring and/or erosion of the liners and other containment features at points of discharge to the impoundments and by wave action at the waterline. 10. Leachate removed from a surface impoundment LCRS shall be discharged to the impoundment from which it originated. Leachate removed from a landfill shall not be discharged to any landfill. 11. Solids which accumulate in a surface impoundment shall be periodically removed to maintain minimum freeboard requirements and to maintain sufficient capacity for landfill and surface