United States Postal Service (USPS)

United States Environmental Protection Agency (US EPA)

Illinois Environmental Protection Agency (US EPA)

Illinois Department of Transportation (IDOT)

City of Chicago

Chicago Department of Environment

Numerous Military Installations

Village of West Dundee

Dundee Park District

OPUS North Corporation

Carmeuse North America

UPS Properties

Harvard Aggregate

Sherwin Williams

Kerr-McGee

Tronox

Kerasotes Theaters

Village of Woodridge

Daimler Chrysler

Boeing Corporation

White Pine Electric Power

John Deere & Company

Pulte Homes

Shell Aircraft

Michigan High School Association

University of Michigan

Pick-n-Pull

Green Roofing

Home Depot

Expo Design Centers

Heartland Blood Centers

William Ryan Homes

Windsor Developments

Cunat Brothers, Inc.

Michael Thomas Developments

Walgreens

Harlem Furniture

Menards

Prime Co

Nextel

Ameritech

Motorola

Siemens

Johnson Controls

Town & Country Homes

Confidential Clients