Certified Crane Operator (CCO) Bridge Construction Zenith Tech | St Ignace, MI Seasonal Heavy Equipment Operator/Certified Crane Operator (CCO) Zenith Tech a Walbec Group Company St. Ignace, MI. Are you looking for an exciting career in road, highway, and bridge construction? Zenith Tech of the Walbec Group has a place for hard working, loyal, and driven people like you.