GSI Members by Focus Groups
(As of June, 2009)

Government Agencies	Owner/Operator	Consultant and 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	AECOM Golder duPont NTH TRI URS CEC GeoTesting Express GEI	Precision Labs CTI & Assoc. Advance Earth Sciences Vector Engrg. Weaver Boos Jones Edmunds Geosyntec Mannik & Smith	Chevron Phillips DuPont LyondellBasell Firestone	CARPI CETCO Contracting Aquatan + (GSI 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. Engineered Coated Products Plasticos Agricolas EVAL Americas	Colbond TC Nicolon Huesker NAUE Propex Fiberweb Tenax GSE Afitex-Texel	GSE Colbond TC Nicolon Tenax Tensar NAUE PolyFlex Fiberweb Infiltrator Systems 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
Philadelphia Water Department