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SECTION 1 -LANDFILL EXPANSION ISSUES Page 1-6 Note that the liner for the vertical expansion will be placed in approximately twenty years; it will be constructed on top of the final cover that will be placed on the existing landfill within the next few years. 1.3.2 Regulatory Requirements The liner and leachate collection systems were designed to meet or exceed the requirements of the following regulatory sections: - California Solid Waste Management Regulations CCR Title 14, Division 7 California Water Regulations CCR Title 23, Chapter 15 - 40 CFR 257 and 258 (Subtitle D) The California Solid Waste Management Regulations, in the general design parameters(Title 14, 17628), require that the site design shall be based on appropriate data, one of which is leachate . control. The public health design parameters (Title 14, 17629)state that another factor that shall be taken into consideration is water quality. Title 14 also requires monitoring (Title 14, 17781 (b)) and collection of leachate during post-closure in accordance with Title 23, CCR subchapter 15, section 2543 (Title 14, 17781 (e)). Under the California Water Regulations, the Austin Road Landfill expansion is classified as a Class III landfill. Class III landfills are not required to have a liner system unless site characteristics alone do not ensure protection of the groundwater or'surface water. Where a liner is required, the design criteria is a single clay liner with a maximum permeability of 1 x 10-6 cm/sec (Title 23, 2533 (b)) with a minimum thickness of 1 foot (Title 23, 2542 (b)). Synthetic liners are required to have a minimum thickness of 40 mils. Class III landfills with a liner system are required to have a leachate collection and removal system (Title 23, 2 (a)). Class III landfills with liners are to have an unsaturated (vadose) zone monitoring program whenever feasible (Title 23, 2559). The federal solid waste disposal facility criteria (Subtitle D) require that new MSW landfills and lateral expansions be constructed in accordance with a design approved by an EPA certified state or with a composite liner system (40 CFR 258.40). At this time, it is unknown whether California will be allowed to use liner criteria different from the composite liner system. The design indicated in these conceptual plans assumes that a composite liner system will be the minimum requirement. Table 1-3 compares the applicable regulations and design elements for the proposed landfill expansion. Appendix B includes leachate generation calculations. v r R.W.Back and Associates MY of Stokwn 1811.002