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Regulations: Title 27, Environmental Protection--Division 2, Solid Waste

Chapter 3. Criteria for All Waste Management Units, Facilities, and Disposal Sites

Figure 4.1: Summary of Liner Requirements for Classified Waste Management Units

Footnotes for Figure 4.1: Summary of Liner Requirements for Classified Units

(for MSW Landfills, see Additional Requirements in SWRCB RESOLUTION NO. 93-62)

a Requirements from Chapter 3, Subdivision 1 of this division.

b Designed to convey twice the anticipated volume of leachate; must ensure no buildup of hydraulic head on liner; blanket type required unless otherwise specified.

c Minimum 40 mils thick.

d Must be compatible with waste and/or leachate.

e Cutoff walls required where potential exists for lateral movement of waste or leachate.

f Acceptability of synthetic liner depends on nature of waste and duration of operation.

g Liner and waste to be removed at closure.

h Substantial thickness of natural geologic material with maximum hydraulic conductivity of 1x10-6 cm/sec (i.e., 1.0 foot/year). For MSW landfills, see SWRCB Resolution No. 93-62 for superseding containment system requirements.

i Minimum thickness of 2 feet; maximum hydraulic conductivity of 1x10-6 cm/sec (i.e., 1.0 foot/year). For MSW landfills, see SWRCB Resolution No. 93-62 for superseding containment system requirements.

j Liner removed or replaced before lower 25% (minimum 1 foot thickness) of the liner is penetrated by waste or leachate.

k Soil characteristics, distance from waste to ground water, and other factors must ensure no impairment of beneficial uses of ground water. Leachate collection system required for sludge disposal. For MSW landfills, see SWRCB Resolution No. 93-62 for superseding containment system requirements.

l Minimum thickness of 1 foot; maximum hydraulic conductivity of 1x10-6 cm/sec (i.e., 1.0 foot/year). For MSW landfills, see SWRCB Resolution No. 93-62 for superseding containment system requirements.

m Dendritic system allowed if wastes in contact with the liner will remain permeable and liner is sloped toward the system to prevent ponding. For MSW landfills, see SWRCB Resolution No. 93-62 for superseding containment system requirements.

 

Last updated: October 01, 2012


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