Multiple crews worked closely together to construct and enhance 10 wetland/pond sites in a short 75-day work window. Working closely with the Washington State Department of Transportation (WSDOT), Tapani crews worked through multiple grade busts and errors in the plans to keep the project moving forward, on-time, and on-budget. With GPS guidance, crews performed excavation and grading in record time. Working in and around salmon/steelhead-bearing creeks required thorough inspections of the equipment during each shift and operating the equipment with biodegradable vegetable oil to prevent stream contamination.
Crews worked side-by-side with biologists and the Department of Fish and Wildlife to safely remove fish and aquatic animals from the worksite while achieving a finished product. An elaborate bypass pumping and dewatering plan was used to maintain healthy water flow and water levels. This was needed to sustain aquatic animals and fish life in the surrounding areas of the project, as well as to lower the water table in the work zone. Crews constructed over 120 habitat structures.
Experienced Tapani operators understood how to work with peat material, which required strategic utilization of stabilization mats, timber, and steel sheets. Also, Tapani provided WSDOT with an in-house Certified Erosion and Sediment Control Lead (CESCL). Throughout the project, this crew member monitored potential erosion control issues and performed Nephelometric Turbidity Unit (NTU) readings to ensure the water turbidity was within allowed limits.