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ORDER AMENDING WASTE DISCHARGE REQUIREMENTS _4 - FOR MUNICIPAL SOLID WASTE LANDFILLS liner on the sideslopes that both meets the performance criteria contained in 40 CFR 258.40(a)(1) and (c) and either: (1) is a composite liner and includes as its uppermost component a synthetic liner at least 40 -mils thick (or at least 60 -mils if high density polyethylene) that is installed in direct and uniform contact with the underlying materials; or (2) is not a composite liner, but includes a synthetic liner at least 60 -mils thick (or at least 80 - mils if of high density polyethylene) that is installed in direct and uniform contact with the underlying materials. 5. All containment systems shall include a leachate collection and removal system which shall convey to an appropriately lined sump or other appropriately lined collection area all leachate which reaches the liner. The LCRS shall not rely upon unlined or ciay-lined areas for such conveyance. 6. New MSWLF units and lateral expansions shall not be located in wetlands unless the discharger has successfully completed, and the Board has approved, all demonstrations required for such discharge under 40 CFR 258.12(x). 7. If located in a 100 -year floodplain, and if receiving waste on or after the Federal Deadline, MSWLF units shall not restrict the flow of the 100 -year flood, reduce the temporary water storage capacity of the floodplain, or result in washout of solid waste so as to pose a hazard to human health and the environment. (40 CFR 258.11). Units which cannot comply with this requirement shall close by 9 October 1996, unless otherwise extended by the Board. (40 CFR 258.16) Water Quality Protection Standards The concentrations of Constituents of Concem in waters passing through the Points of Compliance shall not exceed the Concentration Limits established pursuant to Monitoring and Reporting Program No. 93-200, which is attached to and made part of this Order. The waste discharge requirements of each Discharger listed in Attachment 1 are hereby amended and remain in full force and effect except as modified by this Order. Each Discharger shall comply with the requirements of this Order in addition to the provisions of their respective waste discharge requirements listed in Attachment 1. This Order shall supersede any conflicting provisions in the waste discharge requirements listed in Attachment 1. 2. The Discharger shall receive approval from the Executive Officer before discharging waste to containment areas or waste management units constructed after the effective date of this Order.