Abstract
The lining of a facility for storing or disposing of hazardous materials or wastes on land must serve as an effective barrier to prevent potential contaminating species from migrating into the ground and the groundwater. The process from the design phase through the manufacture of a polymeric geomembrane to its installation and acceptance as a liner involves many steps that must be controlled in order to assure the ultimate effectiveness of the lining. In this paper, a program of quality assurance and quality control involved in the critical steps in the process of constructing a lined waste disposal facility from its design through the final acceptance is described. Included are design, geomembrane selection and compatibility testing, specification, raw materials, geomembrane manufacture, panel fabrication, shipment to field site, inspection, installation and performance testing of the lined facility. Emphasis is placed on factors and properties of geomembranes that relate to service performance and must be controlled. The properties include overall thickness, thickness of coatings above threads, composition control, crystallinity, carbon black content, ply adhesion and seam integrity and strength.
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