Mr. Trewhitt was born in San Francisco and grew up in Berkeley. In 1963 he married Joan Sterling. They were partners in every aspect of their lives, say family members.
As president and CEO of Nortech Waste, Mr. Trewhitt designed, constructed and operated a 2,200-ton-per-day Material Recovery Facility in Roseville. Under his management over the last 17 years, the facility has proven to be the most successful of its kind in the United States, say family members.
Some of Mr. Trewhitt's favorite times were his morning meetings with friends at the Woodside Bakery, boating on the San Francisco Bay and at Lake Tahoe, traveling to Europe with friends, and spending time with his grandsons at Lake Tahoe.
He is survived by his wife, Joan Trewhitt, daughters Stacy Conner and Stephanie Trewhitt; sister Janet Trewhitt; and two grandsons.
Donations may be made to UNR (University of Nevada, Reno) Foundation, Wayne D. Trewhitt Scholarship, College of Engineering, in care of Melanie Perish, Mail Stop 162, Reno, NV, 89557.