AES Corporation

Ameren Energy

American Electric Power (AEP)

Aurora Energy, LLC

Colorado Springs Utilities

Colstrip Energy Limited Partnership

Dairyland Power Cooperative

Dominion

DTE Energy

Duke Energy

FirstEnergy Corp.

Great River Energy

Kansas City Board of Public Utilities

Kansas City Power & Light

LG&E and KU Services Company (formerly E.ON U.S.)

Lower Colorado River Authority

Muscatine Power & Water

Nebraska Public Power District

NRG Energy

Prairie State Generating Company

Santee Cooper

South Carolina Electric & Gas Company

Southern Company

Southern Illinois Power Cooperative

Talen Energy

Tampa Electric Company

Tennessee Valley Authority

Tri-State Transmission & Generation Association, Inc.

WEC Energies Group

Boral Material Technologies Inc.

Charah Inc.

Headwaters Construction Materials

Kansas City Fly Ash LLC

Lafarge/Holcim

MRT - A CEMEX Company

National Minerals Corporation

Nebraska Ash

Salt River Materials

Separation Technologies LLC

The SEFA Group

VHSC Cement, LLC

Waste Management

Beneficial Reuse Management

Lehigh Cement

SCB International Materials, Inc

Sphere One, Inc.

U.S. Minerals

USC Technologies

AECOM

Amec Foster Wheeler

Anne Ellis

ASH Mineral Solutions

Beneficiate: North America

Brad Cole Construction Co, Inc.

Carmeuse Lime & Stone

CB&I Environmental and Infrastructure 

Cementitious Solutions, LLC

CETCO

Chesapeake Containment Systems

Civil & Environmental Consultants, Inc.

Clean Earth Dredging Technologies, LLC

DiGioia Gray and Associates, LLC

Dust Control Technology

DustMaster Enviro Systems

Eklund Environmental

EnCAP-IT

Environmental Resources Management

Environmental Specialties International, Inc.

GAI Consultants, Inc.

GEI Consultants, Inc.

Georgia-Pacific Gypsum, LLC

GHD

Global Containment Solutions

Glover Construction Co, Inc.

Golder Associates

Great Lakes Environmental & Infrastructure Solutions, LLC

Greencraft LLC

Griffin Dewatering

Ground/Water Treatment & Technology

Haley & Aldrich, Inc.

Hanson Professional Services

Hilltop Enterprises, Inc.

Hodges, Harbin, Newberry & Tribble Inc

Hull & Associates, Inc.

Ish Inc

John Ward Inc.

KEMRON Environmental Services

LB Industrial Systems

Lhoist North America (formerly Chemical Lime Company)

Mississippi Lime Company

M. K. Adkins & Associates, Inc.

Moretrench

MRR Southern

NAES Corporation

National Gypsum Company

Nelson, Mullins, Riley & Scarborough

Nu-Rock Technology Pty. Ltd

Periodic Products, Inc.

Philen Construction

Phillips and Jordan, Inc.

Pincelli & Associates, Inc.

PQ Corporation

ProAct Services Corporation

Quikrete Companies, LLC

Rain for Rent

RECON

Republic Services

RJMccall, LLC

Ryan Incorporated Central

S&ME, Inc

Saiia Construction Company, LLC

Schiff Hardin LLP

SCS Engineers

Sevenson Environmental Services Inc.

Silar Services Incorporated

Son-Haul, Inc.

SonoAsh

Stantec

Trans Ash

TransWood Carriers, Inc.

TRC Environmental Corporation

United States Gypsum Company

University of Kentucky - CAER

Waste Connections, Inc.

Weston Solutions, Inc.

Allen Babcock

Dale Baker

Claude Brown

Jim Burnell

Craig Cain

John H. Faber

Dean Golden

David J. Hassett

Howard Humphrey

Gary Jablonski

Dennis Jones

Oscar Manz

James Merkel

Dr. Tarun Naik