American Standard

Ansaldo Industries of America
Arizona Department of Transportation

Bechtel Corporation, Inc.
Birwelco of Pennsylvania
Camp Dresser & McKee, Inc.
Centennial Energy
Chambers Development Company

City of San Diego
Day & Zimmerman International, Inc.

De Leuw, Cather & Company
Ebasco Services
Environmental Energy Associates, Inc.

Hill International, Inc.
HNTB Corporation
ICF Kaiser Engineers
Long Island Rail Road
LS Transit Systems, Inc.
Malcolm Pirnie, Inc.
Massachusetts Bay Transportation Authority

Massachusetts Highway Department

Massachusetts Water Resources Authority

Metcalf & Eddy
Metropolitan Transportation Authority

Michael Baker Corporation
Montgomery Watson Inc.
Morrison Knudsen, Inc.
New Jersey Transit
NYC Department of Sanitation
NYC Department of Transportation

NYC School Construction Authority

NYC Transit Authority
O'Brien - Kreitzberg & Associates, Inc. Parsons Brinckerhoff Construction Services
Parsons Brinckerhoff Quade & Douglas. Inc.
Port Authority of NY & NJ
Roy F. Weston, Inc.
San Diego Consortium
San Diego County Water Authority
South Eastern Penn. Transportation Authority (SEPTA)

Steinman Boynton Gronquist & Birdsall
Stone & Webster Engineering Corporation
Syska & Hennesy, Inc.
TAMS Consultants, Inc.
Tishman Construction Corporation
Triborough Bridge & Tunnel Authority (TBTA) URS Consultants, Inc.
Union Switch & Signal
Vanasse Hangen Brustlin, Inc.
York Research Corporation
Zollo Construction