More than 20 years ago, the founders of the PVC Geomembrane Institute (PGI) and the succeeding entity, the Fabricated Geomembrane Institute (FGI) set out to test materials that were in actual field use. They wanted to exhume numerous samples for testing on a periodic basis without ruining the integrity of the installed primary liner system. The Minnesota Department of Natural Resources (MnDNR) became a partner, and at a MnDNR settling basin near the town of Hibbing, Minn., the long-term durability study was initiated in 1995. The ongoing project’s main objective is to investigate the 30-year durability of PVC geomembranes and PVC chemical fusion and hot wedge welded seams.
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