ABC Rail Corporation

Action Environmental

Alcoa, Inc.

Allegheny County Conservation District

Allegheny Recovery Corp.

Allied Waste/Browning Ferris Industries

American Color and Chemical

American Exploration Co.

Ameron Construction Co., Inc.

Baker Environmental

Beacon Generating

Bellefonte Area School District

Blue Mountain LLC

Borough of Plum

Buckhart-Horn Basco

Carbide/Graphite Group, Inc.

CCDA Waters LLC

Ceco Associates, Inc.

Centre County Solid Waste Authority

Citizen’s Financial Group

City of Philadelphia

Clinton County Solid Waste Authority

CMT Laboratories, Inc.

Commonwealth of PA- Department of

General Services

Custer Services, Inc.

Danone

Delaware County Solid Waste Authority

E.I. DuPont DeNemours & Co., Inc.

Emcor Energy Services

Environmental and Recycling Services, Inc.

First Commonwealth Bank

First Media Radio

Fleetwood Industries

Fosbel

Jay Fulkroad & Sons, Inc.

General Electric

Geotechnics, Inc.

Glucroft Corporation

Granger Energy LLC

Graymont, Inc.

GTE

Habitat for Humanity

Hatch Mott MacDonald Group, Inc.

Hillside Assisted Living Center

Hope for Kids, Inc.

HRI, Inc.

International Paper

Jacobs Creek Watershed Association

Jersey Shore State Bank

Juniata College

Kephart Trucking, Inc.

Keystone Financial Bank

Keystone Hospitality Group

Kissinger, Leonard and Brower Realtors

Joseph Krentzman & Sons, Inc.

LaFarge North America, Inc.

Lake Raystown Resort and Lodge

Loyalhanna Watershed Association

LMH Environmental

Maryland Environmental Service

Masonite Corporation

McKean County Solid Waste Authority

Mellon Bank

Merck & Co.

M & T Bank

Mifflin County Solid Waste Authority

Miller, Kistler, Campbell, Miller, Williams & Benson, Inc.

Miller’s Recycling Center

National Indemnity, Inc.

Nationwide Insurance

Natural Earth Systems

New Enterprise Stone & Lime Co., Inc.

North American Refractories Co.

Northern Tier Solid Waste Authority

Northeast School District

Omega Bank

O’Melveney & Myers

Parks Transfer and Recycling Center, Inc.

Penn Beaver Veneer Corp.

Penncara, Inc.

Pennsylvania-American Water Company

PaDOT

Pennsylvania Emergency Management Agency

Pennsylvania Power and Light

The Pennsylvania State University

Pepco Energy Services

Permagrain Products, Inc.

Philadelphia Suburban Water Company

Pine Grove Landfill, Inc.

Pittsylvania County (VA) Solid Waste Authority

Pleasant Valley School District

Plum Creek Watershed Association

PNC Bank

Potter County Solid Waste Authority

Process Recovery Corporation

Pucketa & Chartiers Watershed Association

Redevelopment Authority of New Kensington

Redevelopment Authority of the County of Washington

Reiders, Travis, Mussina, Humphrey & Harris

Reliance Bank

Republic Services, Inc.

Resource Technologies Corporation

Roman Construction, Inc.

S&A Custom Built Homes, Inc.

John Sexton Sand & Gravel Corporation

Scientific Systems, Inc.

Seneca Landfill

Sevenson

Spang & Company

Southeast Chester County Solid Waste Authority

Sovereign Bank

S&T Bank

Staiman Recycling Corp.

Standard Steel

Sunoco Oil

Susquehanna-Wyoming Solid Waste Authority

Sweetland Engineering

Taylor Geoservices, Inc.

Unico Corporation

Unisys Corporation

URS

U.S. Army Corp. of Engineers

U.S. Bronze Foundry & Machine Co., Inc.

U.S. EPA

U.S. Filter

Valley Mining, Inc.

Veolia E.S.

Viking Energy

Vogel Disposal, Inc.

Vox Allegany, LLC

Ward Manufacturing, Inc.

Washington County Watershed Alliance

Waste Management, Inc.

Waste Systems International

Wayne County National Bank

White Pines Corporation

Wetlands Habitat Management, Inc.

Woodland Campground

Zenon Environmental Inc

Zircoa, Inc.