Work also included the construction of infiltration ponds and drywells.
To proceed with the new bridge build, a temporary access road was put in place on the west side of the ravine (Chumstick Creek) which required de-watering and re-routing of the creek. Two coffer dams were constructed (one on up end, one on down end of the temporary road over creek). Two 8”diesel pumps were placed and run 24 hours per day, for three weeks, and pumped water up the bank at a 50’ vertical and released the water 250’ up the creek until the construction of the bridge (abutments, setting of girders, decking) was completed. The temporary road, made up of 5,000 cubic yards of material, was excavated and removed, along with the entire 10’ diameter culvert pipe.
To complete the project, a new creek bottom was put in place beneath the new bridge and the site was restored to its natural habitat with new landscaping, plantings, trees, etc.. All work was in accordance with the Washington Department of Fish and Wildlife in-water work specifications.