GSI Members by Focus Groups
(As of May, 2008)

Government Agencies	Owner/Operator	Consultant & Test labs	Resin Producers	Installers/Contractors
U.S. EPA U.S. FHwA U.S. Corps Engrs. GSI-Korea GSI-Taiwan	EnviroSource Inc. Waste Mgmt., Inc. Republic Services	Earth Tech Golder duPont NTH TRI URS CEC GeoTesting Express GEI STS Precision Labs CTI & Assoc. Advance Earth Sciences Vector Engrg. Weaver Boos Jones Edmunds Geosyntec	Chevron Phillips LyondellBasell Firestone	CARPI CETCO Const. Aquatan + (many manufacturers)

Geomembrane	Geotextile	Drainage Geocomposites	Geogrid	GCL
GSE PolyFlex Agru NAUE Solmax GSE Chile, S.A. Atarfil, S.L. Firestone GSE-Europe Raven Industries Polytex Carlisle EPI Aquatan PRS Mediterranean Ltd.	Colbond TC Nicolon Huesker NAUE Propex Fiberweb Tenax GSE	GSE Colbond TC Nicolon Tenax Tensar NAUE PolyFlex Fiberweb Ring Ind. Aquatan	Tensar Colbond Tenax TC Nicolon Huesker NAUE Fiberweb	GSE CETCO Huesker NAUE

Associate Members

Delaware Solid Waste Authority
Nebraska DEQ
New York DEC
New Jersey DEP
Maine DEP
New York DOT
Calif. Water Res. Control Board
Pennsylvania DEP
Florida DEP
U.S. BuRec
Michigan DEQ
United Kingdom Environment Agency
Florida DOT
NDCSMC-Soil Mechanics
Virginia DEQ
Massachusetts DEP