This online short course will focus on subgrade preparation for installation of flexible geomembranes. In addition, the course will focus on the use of geosynthetic clay liners (GCLs) with flexible geomembranes to create a composite barrier system. This course will describe the requirements for subgrade preparation before a flexible geomembrane is installed, such as maximum rock size allowed, presence of water, and smooth rolling the surface before geomembrane installation. This course will also present information on the use of GCLs with flexible geomembranes instead of or in addition to a compacted soil liner. 3.0 PDH
