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ORDER AMENDING WASTE DISCHARGE REQUIREMENTS _2_ FOR MUNICIPAL SOLID WASTE LANDFILLS 6. The RWQCB can amend the waste discharge requirements of a group of similarly situated dischargers through a single Board action in cases where the amended requirements properly apply to each of the dischargers whose waste discharge requirements are so amended. 7. Field testing has demonstrated that releases of leachate and gas from MSWLFs that are unlined are likely to degrade the quality of underlying ground water.- Research on liner systems for landfills indicates that single clay liners will only delay, rather than preclude, the onset of leachate leakage, and that the use of composite liners represents the most effective approach for reliably containing leachate and landfill gas. 8. Statistical data -comparison methods typically used to detect the migration of wastes from a waste management unit cannot be used in cases where the constituent to be monitored has a background concentration which does not exceed the constituent's detection limit in at least ten percent of the background samples. In such cases, an alternative non -statistical testing methodology is necessary which is sensitive, reliable, and not prone to falsely identifying a release. 9. This action to amend WDRs is exempt from the provisions of the California Environmental Quality Act (Public Resources Code Section 21000, et seq.), in accordance with Title 14, California Code of Regulations (CCR), Section 15301. 10. This Order implements (1) the Water Quality Control Plan for the Sacramento River, Sacramento -San Joaquin Delta, and San Joaquin River Basins (5A, 5B, 5C), Second Edition; (2) the Water Quality Control Plan for the Tulare Lake Basin (5D); (3) the prescriptive standards and performance goals of Chapter 15, Division 3, Title 23 of the California Code of Regulations, effective 27 November 1984, and subsequent revisions; (4) the prescriptive standards and performance criteria of Part 258, Title 40 of the Code of Federal Regulations (Subtitle D of the Resource Conservation and Recovery Act); and (5) State Water Resources Control Board Resolution No. 93-62, Policy for Regulation of Discharges of Municipal Solid Waste, adopted 17 June 1993 . 11. This Order amends the existing waste discharge requirements of each discharger listed in Attachment 1 (hereafter Discharger). Those waste discharge requirements remain in full force and effect except as modified by this order. 12. The Board has notified each Discharger and interested agencies and persons of its intention to amend the waste discharge requirements listed in Attachment 1. 13. In a public hearing, the Board heard and considered all comments pertaining to these facilities and discharges.