Abrasives, Inc.

AES

ADA-ES, Inc.

Aggregate & Ready Mix Association of Minnesota

Alabama Rural Electric Association

ALLETE I Minnesota Power

Alliant Energy Corp

Ameren Corp

American Coal Ash Association

American Concrete Pavement Association

American Concrete Pipe Association

American Concrete Pumping Association

American Electric Power

American Forest & Paper Association

American Public Power Association

American Road & Transportation Builders Association

American Segmental Bridge Institute

American Society of Concrete Contractors

Anza Electric Cooperative, Inc.

ARIPP A (Anthracite Region Independent Power Producers Association)

Arch Coal, Inc.

Arizona Generation and Transmission Cooperatives

Arkansas Ready Mixed Concrete Association

Ash Grove Cement Company

Ash Grove Resources, LLC

Association of American Railroads

Association of Illinois Electric Cooperatives

Association of Louisiana Electric Cooperatives, Inc.

Association of Missouri Electric Cooperatives, Inc.

Aurora Energy Services, LLC

A vista Corp

B&B Concrete Co., Inc.

Baker Ready Mix & Building Materials

Basin Electric Power Cooperative

Bayou Concrete, LLC

Beaver Lake Concrete

Beneficial Reuse Management, LLC

Big Rivers Electric Corporation

Bluegrass Paving

Boral Material Technologies, LLC

Brick Industry Association

Buckeye Power, Inc.

Buffalo Ridge Concrete, Inc.

California Construction and Industrial Materials Association

Capital Concrete, Inc.

Carew Concrete & Supply Co.

Carl V. Carlson Company

Carlo Ditta, Inc.

Carolina SunRock, LLC

Caroll Concrete Co.

Carpet and Rug Institute

CEMEX, Inc.

Cemexpress LLC

Cemstone

Central Electric Power Cooperative - Missouri

Central Electric Power Cooperative- South Carolina

Ceratech, Inc.

Chandler Concrete Co., Inc.

Chaney Enterprises

Charah, Inc.

Citizens for Recycling First

CMS Energy Corp

Colorado Rural Electric Association

Colorado Springs Utilities

Concrete Foundations Association

Concrete Reinforcing Steel Institute

Concrete Supply Co

Connecticut Construction Industries Association

Connecticut Ready-Mixed Concrete Association

Connecticut Road Builders Association

Construction & Demolition Recycling Association

Com Refiners Association

Council of Industrial Boiler Owners

Dairyland Power Cooperative

Dayton Power & Light

Dells Materials Company

Deseret G&T Cooperative

DiGioia, Gray & Associates, LLC

Dolese Bros. Co.

Dominion

Drake Aggregates, LLC

Drake Materials

DTE Energy

Duke Energy Corp

Dynegy

Eagle Environmental Services, LLC

East Kentucky Power Cooperative, Inc.

East River Electric Power Cooperative, Inc.

Eastman Chemical Company

Edison Electric Institute

Electric Cooperatives of Arkansas

Electric Power Associations ofMississippi, Inc.

Electric Reliability Coordinating Council

Empire District Electric

Ensio Resources, Inc.

Entergy Corp

Everhard Products, Inc.

Evonik Corporation

FirstEnergy Corp

Florida Electric Cooperatives Association, Inc.

General Resource Technology

Generators for Clean Air

Geneva Rock Products, Inc.

Georgia Electric Membership Corporation

Geosyntec Consultants, Inc.

Geosynthetic Materials Association

Gerhold Concrete Company, Inc.

Golder Associates, Inc.

Grand Canyon State Electric Cooperative Association

Great River Energy

Gypsoil, LLC

Harper Company

Harsco Minerals International

Headwaters Resources, Inc.

Heartland Consumers Power District

High Grade Materials

Hoosier Energy Rural Electric Cooperative

Hull & Associates, Inc.

Idaho Consumer-Owned Utilities Association

Indianapolis Power & Light

Indiana Statewide Association of Rural Electric Cooperatives

Industrial Energy Consumers of America

Institute of Makers of Explosives

Integrys Energy Group

Interlocking Concrete Pavement Institute

Iowa Association ofBusiness and Industry

Iowa Association of Electric Cooperatives

James Construction Group

JD Concrete

JEA

JJ Ferguson Prestress/Precast Co.

JMT Holdings, LLC

John Richardson & Company, Inc.

Kansas City Power & Light

Kansas Electric Cooperatives, Inc.

Kearney Concrete Co.

Kentucky Association of Electric Cooperatives, Inc.

Kentucky Utilities Co.

LB Industrial Systems, LLC

Lafarge (US)

Large Public Power Council

Lehigh Hanson, Inc.

Louisville Gas & Electric Co.

Luminant

Lyman-Richey Corporation

LyondellBasell

Mason Contractors Association

Maxxon Corp.

MEAG Power

Metro Ready Mix

Michael Harris Construction Company

Michigan Electric Cooperative Association

Michigan Municipal Electric Association

MidAmerican Energy Company

Midwest Coal Ash Association

Midwest Food Processors Association

Minnesota Rural Electric Association

Minnkota Power Cooperative, Inc.

Mississippi Concrete Industries Association

Missouri Concrete Association

MMC Materials, Inc.

Mobile Abrasives

Mobley Concrete Company

Montana-Dakota Utilities Co.

Montana Electric Cooperatives' Association

National Association of Manufacturers

National Concrete Masonry Association

National Gypsum

National Mining Association

National Oilseed Processors Association

National Precast Concrete Association

National Ready Mixed Concrete Association

National Rural Electric Cooperative Association

National Slag Association

Nebraska Concrete & Aggregates Association

Nebraska Power Association

Nebraska Rural Electric Association

Nevada Rural Electric Association

New Mexico Rural Electric Cooperative Association, Inc.

NIPSCO

North Carolina's Electric Cooperatives

North Dakota Association of Rural Electric Cooperatives

Northeast Utilities

North Florida Hauling LLC

Northwest Iowa Power Cooperative

OGE Energy Corp.

Oglethoq)e Power Corporation

Ohio Concrete

Ohio Rural Electric Cooperatives, Inc.

Oklahoma Association of Electric Cooperatives

Old Castle Materials, Inc.

Old Dominion Electric Cooperative

Oregon Concrete & Aggregate Producers Association

Otter Tail Power Company

Overland Ready Mix

Ozinga Bros., Inc.

Pacific Power

Pebble Technologies, Inc.

Penn United Technologies, Inc.

Pennsylvania Aggregates and Concrete Association

Pennsylvania Rural Electric Association

Phoenix Cement Company

Pinnacle West Capital Corporation, parent company to Arizona Public Service Company

Platte River Power Authority

PMI Ash Technologies

Port Aggregates, Inc.

Portland Cement Association

Portland General Electric

PPLCorp

Public Service Company ofNew Mexico

Puget Sound Energy

RLH Investments, LLC

Rocky Mountain Power

S&ME, Inc.

Salt River Materials Group

Salt River Project

San Miguel Electric Cooperative, Inc.

Santee Cooper

SCAN A

Seminole Electric Cooperative, Inc.

Separation Technologies LLC

Shamrock Concrete Company

Shayeson-Huff Properties

Silar Services, Inc.

Smith Ready Mix

Solomon Colors, Inc.

Souixland Concrete

Souris Valley Ready Mix, LLC

South Dakota Ready Mixed Concrete Association

South Dakota Rural Electric Association

South Mississippi Electric Power Association

Southern Company

Spurlino Materials

Standard Ready Mix

Sunflower Electric Power Corporation

Sunshine Concrete & Materials, LLC

Supermix

Tampa Electric Company

Tau Technical Communications, LLC

Tennessee Concrete Association

Tennessee Electric Cooperative Association

Terrebonne Concrete LLC

Texas Coal Ash Users Group

Texas Electric Cooperatives

The Electric Cooperatives of South Carolina, Inc.

The Wells Group, LLC

Tile Roofing Institute

Tilt-up Concrete Association

Titan America LLC

Transcement LLC

Trans Wood Carriers, Inc.

Tri-State Generation & Transmission Association

UNS Energy Corporation

USC Technologies

US Chamber of Commerce

Usibelli Coal Mine, Inc.

U.S. Minerals, Inc.

Utah Rural Electric Association

Utility Solid Waste Activities Group

Vectren Corporation

Vulcan Materials Company

Wahoo Concrete

Washington Aggregates & Concrete Association

Wells Fargo Insurance Services

Westar Energy

Western Farmers Electric Cooperative

Wisconsin Cast Metals Association

Wisconsin Electric Cooperative Association

Wisconsin Energy Corporation

Wisconsin Industrial Energy Group

Wisconsin Manufacturers & Commerce

Wisconsin Paper Council

Wisconsin Public Service Corporation

Wisconsin Ready Mixed Concrete Association

Wisconsin Transportation Builders Association

Wisconsin Utilities Association

Wolverine Power Supply Cooperative

WPPI Energy

Wyoming Rural Electric Association

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