Six Companies Inc.

Henry J. Kaiser Co. of Oakland, California/Bechtel Corporation of San Francisco (Bechtel-Kaiser) - 30% MacDonald and Kahn of Los Angeles, California - 20% Utah Construction Company of Ogden, Utah - 20% Morrison-Knudsen of Boise, Idaho - 10%, Pacific Bridge Company of Portland, Oregon - 10% J.F. Shea of Portland, Oregon - 10%