- Arthur Andersen/Andersen Consulting
- Bishop-Wisecarver
- Bisys, Inc.
- Budget Car and Truck Rental
- Calpine Containers
- Central Contra Costa Sanitary District
- CFOs2GO
- City of Concord
- Davidon Homes
- Delta Diablo Sanitation District
- Diablo Regional Arts Association
- Dublin San Ramon Services District
- Dun and Bradstreet
- Entrust
- Ernst and Young
- FamilyCare
- Financial Services Network
- Giga-Tronics
- Hay Management
- Hewitt Associates
- Knudsen
- Kohler
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- Ladbroke Association
- Lotus General Contractors
- National Electrical Contractors Association
- Nextel Communications
- Norcal Mutual Insurance
- Old Republic
- PeopleSoft
- Regional Training Center
- Renoir Staffing
- RMC Lonestar
- Roto Rooter
- SIFE
- Surplus Lines Association
- Sybase
- Systron Donner
- Technical Safety Services
- The Flecto Company
- US Windpower/Kenetech
- Vanpac Carriers, Inc.
- Walnut Creek Chamber of Commerce
- Waste Management
- Wells Fargo
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