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OCR for page 115
Assessment of the Performance of Engineered Waste Containment Barriers Appendix C Construction Quality Assurance Monitoring Techniques TABLE C.1 CQA Techniques for End-of-Construction Barrier Element Integrity Barrier Element CQA Integrity Monitoring Techniques Compacted low-permeability soil In situ density and water content testing; in situ hydraulic conductivity testing using infiltrometers, pan lysimeters, and borehole permeameters; physical sampling and laboratory testing for index properties and saturated hydraulic conductivity Evapotranspirative cover soil In situ water content testing; in situ flux rate testing using pan lysimeters; physical sampling and laboratory testing for index properties, including saturated hydraulic conductivity, and for the soil water characteristic curve Geomembranes Nondestructive seam testing; physical sampling and laboratory testing of seams; electrical leak detection testing; interface shear testing Geosynthetic clay liners Physical sampling and testing for bentonite unit weight and saturated hydraulic conductivity; interface shear testing Soil-bentonite walls Sounding of the trench prior to backfill placement, physical sampling, and testing backfill soil from the borrow pit for saturated hydraulic conductivity; physical sampling and testing backfill soil from the wall for saturated hydraulic conductivity; in situ saturated hydraulic conductivity testing of the wall backfill Cement-bentonite walls Sounding of the trench prior to backfill placement, physical sampling and testing of the cement-bentonite backfill for saturated hydraulic conductivity; physical sampling and testing of cores from the wall for saturated hydraulic conductivity Soil-mixed walls Physical sampling and testing of cores from the wall for saturated hydraulic conductivity
OCR for page 116
Assessment of the Performance of Engineered Waste Containment Barriers This page intentionally left blank.
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