Geosynthetics 12 ON THE COVER RUSAL Alumina clarifier pond bituminous geomembrane (BGM) liner, Ireland FEBRUARY/MARCH 2021 Volume 39 Number 1 Features 12 Bituminous geomembranes for ponds in mining By Natalie Daly and Bernard Breul 20 Comparative analysis of the flow and filtration capabilities of sediment retention devices-Part 1 By James E. Sprague and C. Joel Sprague 20 28 Premier Product Showcase 28 www.GeosyntheticsMagazine.com 3http://www.GeosyntheticsMagazine.com