Generalized Waste Containment System

Generalized Waste Containment System

Linear System RequirementsSubtitle C liner -40 CFR Part 264; Subpart N -264.301 Design & Operating Requirements.Subtitle D liner -40 CFR Part 258; Subpart D -258.40 Design Criteria

Subtitle C Liner SystemLiner System should include:1. top liner (e.g. geomembrane)2. composite bottom liner e.g. geomembrane + compacted clay compacted clay -must be at least 3 ft thick - ksat should be no greater than 1x10-7cm/sec

Subtitle C Liner System3. Leachate Collection and Removal System above top liner -leachate depth should not exceed 1ft (30cm) 4. Leachate Collection and removal System between liners.

LCRS Requirementsbottom slope 1%

at least 1 ft thick gravel layergeonet with transmissivity >no clogging

Subtitle C Liner System

Subtitle D Liner SystemDesign must ensure that concentration values in Table.1 are not exceed in the uppermost aquiferComposite liner -min 30 mil flexible membrane liner (FML) -compacted clay (at least 2 ft thick - > -HDPE, then min 60 mil )

Subtitle D Liner System

Barrier MaterialCompacted clay (soil liner)Soil-Bentonite blendsFMLs or GeomembranesGeosynthetic clay liner

Compacted ClayRef: Daniel and Koerner (Chapter 3)Material selectionLaboratory TestingTest pads-Field TestingConstruction Quality Control

Material Selection for CCLs Soil PlasticityPercentage of FinesPercentage of GravelMaximum Particle size

Necessary Soil Mechanics BackgroundWater content Particle Size Distribution -Sieve analysis -Sedimentation analysisAtterberg limitsSoil ClassificationSoil CompactionSoil Permeability