Assessment of the Performance of Engineered Waste Containment Barriers (2007) / Chapter Skim
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6 Summary and Recommendations
6 Summary and Recommendations
Pages 93-98
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From page 93... ...
A number of observadraws the following conclusions regarding the performance tions about performance (e.g., liners can get hot, leachate of barrier systems: collection systems and drains can clog, long-term exposure of geosynthetics to high temperatures and chemicals can de • Modern composite liners generally appear to be work- grade their properties, incompatibility between CCL, GCL, ing well, up to the assessed period of about 20 years, with and leachate may require many years to develop) suggest that double composite liners constructed according to rigorous considerable care in design is needed to avoid problems in construction quality assurance guidelines providing the best the 20- to 100-year time frame.
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From page 94... ...
New techniques are needed to directly for performance data collected in the field from operating TABLE 6.1 Recommended Data and Information Collection for Long-Term Assessment of Engineered Barrier Performance Measurement Parametera Technique Purpose Frequency Location Existing but should be more accessible Leachate flow rate Lysimeters, LCRS, and Cover, LCRS, and Collect continuously, report At collection and discharge extraction trench flow rate extraction system monthly averages and peak points measurements effectiveness; demand on flows annually liner or barrier Leachate composition Chemical analyses Demand on liner or barrier Collect indicators At collection points semiannually Leak detection system Fluid levels, piezometers Effectiveness of primary Collect monthly peaks and LDS collection or discharge flow rate liner averages points
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From page 95... ...
reported monthly at selected MSW and ash landfills Head on liner Leachate-level Demand on liner, Monthly peak and average Representative points at measurement in wells, effectiveness of LCRS values selected MSW, ash, and piezometers hazardous waste landfills Leakage (lysimeter) Leachate collection in Fluid flow and mass flux Monthly totals All single-lined landfills beneath sump lysimeter through area over lysimeter Defects in vertical barriers Geophysical techniques Barrier integrity End of construction and All vertical barriers (e.g., electrical imaging periodically thereafter of gas tracers or injected brine)
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From page 96... ...
The committee's of data from different types of waste containment systems, analysis of data from engineered barrier systems that contain constructed from a variety of components, and located in low-level radioactive waste, hazardous waste, and municidifferent climate regimes. Some of this information could be pal solid waste suggests that extended monitoring periods gathered from existing facilities where sufficient funding is (hundreds to thousands of years)
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From page 97... ...
Evidence to date reveals few failures of engineered ing to confirm performance. Given the current lack of perfor- waste containment barrier systems that have been designed, mance data and deficiencies in monitoring technology and constructed, operated, and maintained in accordance with validated and calibrated models (Sections 6.2 to 6.4)
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