Requesting bids for rehabilation/modification of boardwalks & 1 observation deck at nature park. 4 work items involve rehab/modification of boardwalks in wetland areas. Additional item is removal and replacement of observation deck, constructed on helical piles. Work consists of providing all labor, material, and equipment. Bidders should have at least 3 years experience with helical systems and must be a member of Professional Trail Builders Assoc.