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SECTION 1 -LANDFILL EXPANSION ISSUES Page 1-8 Citation Regulation Design Element Title 23,2543 (c) ..no buildup of hydraulic head on the Sumps are designed be below the liner.The depth of fluid on the collection collection trench system invert to assure sump shall be kept at the minimum adequate pump submergence and needed to ensure efficient pump prevent hydraulic buildup in collection operation. system. Leachate collection system designed to keep the maximum head on the liner less than 12 inches. Title 23,2543 (d) Leachate collection systems shall be Leachate collection system will include designed and operated to function without pipe clean-out access points for clogging ...system tested annually to inspection and flushing of the system. demonstrate proper operation. Title 23,2543 (f) Class III landfills required to have an Leachate drainage layer covers full liner artificial liner...a dendritic leachate area. collection and removal system which underlies less than 100 percent of the waste may be allowed. Title 23,2543 (g) Collected leachate shall be returned to Leachate recirculation will not be the waste management unit(s)from which considered as an alternative for leachate in came or discharged in another manner disposal. Leachate disposal will be off approved by the regional board. site and require regional board approval. 01 CCR 258.40(a) New MSWLF units and lateral expansions Composite liner system is used,leachate shall be constructed: collection system is designed to maintain (1) In accordance with a design approved leachate depth at 12 inches or less. (30 by the Director of approved state...or(2) cm equals approximately 12 inches). With a composite liner as defined in paragraph (b) of this section and a leachate collection system that is designed and constructed to maintain less than a 30-cm depth of leachate over the liner. 258.40(b) Composite liner means a system con- Composite liner consists of a 60-mil mini- sisting of two components; ... a minimum mum HDPE geomembrane and a 2-foot of 30-mil flexible membrane liner(FML) compacted clay layer with a maximum ... and ... at least a 2-foot layer of hydraulic conductivity of 1 x 17'cm/sec. compacted soil with a hydraulic conduc- tivity of no more than 1 x 10''cm/sec. FML components consisting of HDPE shall be at least 60-mil thick.The FML component must be installed in direct and uniform contact with the compacted soil component. 1.3.3 Landfill Liner System J The proposed landfill liner on both the horizontal and vertical expansions is a composite system, which consists of a geomembrane liner underlain by two feet of compacted clay soil with a maximum permeability of 1 x 10-7 cm/sec. This liner will meet the requirements of CCR 258.40 R.W.ee�x AssociatesGtrm stocition 1811.002 � II