August 17, 2010 > Volunteers needed at Don Edwards National Wildlife Refuge Volunteers needed at Don Edwards National Wildlife Refuge Submitted By Mieko Griffin Volunteers are needed to staff the Visitors Center at the Don Edwards National Wildlife Refuge in Fremont. Shifts are either 10 a.m.-1:30 p.m. or 1:30-5 p.m. Tuesday through Sunday. If interested, please call Mieko Griffin at (510) 792-0222 ext 362.