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lecture23 - Lecture 23 Requirements for Landfill Closure...

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Lecture 23 Requirements for Landfill Closure and Monitoring
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Solid waste landfill closure under RCRA SUBTITLE D 6.2 FINAL COVER DESIGN 40 CFR §258.606.2.1 Statement of Regulation (a) Owners or operators of all MSWLF units must install a final cover system that is designed to minimize infiltration and erosion. The final cover system must be designed and constructed to: (1) Have permeability less than or equal to the permeability of any bottom liner system or natural subsoils present, or a permeability no greater than 1 x 10 -5 cm/sec, whichever is less, and (2) Minimize infiltration through the closed MSWLF unit by the use of an infiltration layer that contains a minimum of 18-inches of an earthen material, and (3) Minimize erosion of the final cover by the use of an erosion layer that contains a minimum 6-inches of earthen material that is capable of sustaining native plant growth.
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Solid waste landfill closure under RCRA Solid waste Topsoil (6 inches minimum) Vegetative Cover Infiltration Cover with K < 1 x 10 -5 (18 inches minimum)
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Closure of hazardous waste landfill Requirements for RCRA hazardous waste facilities (Subtitle C) are substantial: Includes multi-layer cap: Low hydraulic conductivity soil/geomembrane layer Drainage layer Vegetation soil layer Reference: U.S. EPA, 1991. Design and Construction of RCRA/CERCLA Final Covers. Report Number EPA/625/4-91/025. U.S. Environmental Protection Agency, Cincinnati, OH. May 1991.
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Closure of hazardous waste landfill Solid waste Geotextile Gas Vent Layer (optional) Geotextile Protection (cobble) layer Top Soil Cover Vegetative Cover Drainage Layer FML Geotextile Compacted clay
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Components of RCRA cap Vegetation layer Provides vegetation growth Provides erosion control Reduces infiltration by plant transpiration Protection layer is optional but provides: Freeze-thaw protection Medium for root growth Possibly rodent protection using cobbles
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