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SECTION 1 -LANDFILL DCPANSION ISSUES Page 1-16 Citation Regulation Design Element CCR 258.21 Cover Material Requirements: Daily cover will consist of a (a) ... all MSWLF units must cover disposed solid minimum of six inches of waste with six inches of earthen material at the compacted soil. end of each operating day... (b)Alternative materials of an alternative thickness...may be approved.. (c)The Director of an approved State may grant a waiver...extreme seasonal climatic conditions.. CCR 258.40 (b) Compost liner...flexible membrane liner(FML) .. Composite liner consists of a and .. at least two-foot layer of compacted soil 60-mil minimum HDPE with hydraulic conductivity of no more than geomembrane and a two foot 1 x 10''cm/sec. compacted clay layer with a maximum hydraulic conductivity of 1 x 10`7 cm/sec. CCR 258.60 (a)(1) Closure criteria:The infiltration layer must be A geomembrane final cover comprised of minimum of 18"of earthen material with an underlying soil layer of that has a permeability less than of equal to the 18"with maximum permeability permeability of any bottom liner system or natural of 1 x 10 cm/sec. subsoils present, or a permeability no greater than 1 x 10'cm/sec. A June 26, 1992 clarification discusses the fact that"While this standard does not explicitly require the use of a synthetic membrane in the final cover,the Agency anticipates that if a MSWLF has a synthetic membrane in the bottom of the unit,then the infiltration layer in the final cover will, in all likelihood given today's technologies, include a synthetic membrane as part of the final cover." CCR 258.60(a)(2) The erosion layer must consist of a minimum of 6 Soil cover will have a minimum inches of earthen material that is capable of thickness of twelve inches. sustaining native plant growth. CCR 258.60(b) The Director of an approved State may approve Altemative cover not proposed. an alternative final cover design... 1.5.2 Daily and Intermediate Cover Daily and intermediate cover will be obtained primarily from excavation of the horizontal expansion phases and from the borrow area located north of the existing landfill. As required by the regulations, the minimum depth of the compacted daily cover is six inches and for the intermediate cover, the minimum thickness is twelve inches. Daily and intermediate cover operations are discussed in the Operation Plan. Quantity requirements are discussed In the mass balance section below. Appendix C also includes a discussion of non-soil daily and intermediate I cover material. y It is recommended that on-site soil be used for daily cover until such time that the CIWMB I approves an alternative cover material. Several tests of alternative covers are being used in a I R.W.Bede and Associates City of Stockton 1811.002