The use of geosynthetics is increasing in all types of waste management facilities. The use of flexible membranes for containment and geonets and geotextiles for conveyance of liquids and gases will allow the design community to develop innovative designs. However, the use of geosynthetics is not without technical issues. The paper will discuss the issues of chemical resistance and biologica/particulate clogging of these materials. Chemical resistance evaluation of all geosynthetics is required for hazardous waste containment. Method 9090 is the recognized method to expose the material and specific tests have been recommended to assess the rate of change in selected physical properties. The use of the technique in MSW facilities may or may not be required. Several issues including the proposed method will be discussed and recommendations made. Biological/particulate clogging of synthetic drainage materials has been under investigation for over two years. Initial results indicate that MSW leachate will support a good biological mass that will in fact clog the geosynthetics. Results also indicate that the biologicals do not degrade the geosynthetics. Control techniques such as a surface biocide or a migrating biocide are being evaluated. These results will be discussed. Particulate clogging is also a design feature that requires consideration when designing MSW disposal facilities. The latest design information will also be discussed.

"EPA 600/D-90/061".