. . . . . "Geomembrane liners manufactured from polymers such as high density polyethylene (HDPE), linear low density polyethylene (LLDPE), polypropylene (PP), polyvinyl chloride (PVC), ethylene propylene diene monomer (EPDM), chlorosulfonated PE (Hypalon ??), and PVC alloy (XR-5??), and even more sophisticated polymer alloys are used very effectively in reservoirs to contain potable water, and in wastewater" . . .