•ALCOA
•American Can Co.
•Barrick Gold Company
•CertainTeed
•Chevron
•ConocoPhillips
•Dow Chemical
•E.I. DuPont de Nemours & Company
•Georgia Pacific

•Pacific Gas & Electric Company
•Shell Oil Co.
•Sherwin Williams
•State of California (Geothermal)
•Tesoro Marketing and Refining Co.
•US Army Corp of Engineers (Hamilton Air Force Base)
•USS Steel Corp.
•Valero Refining Co.
•Zeneca