Washington State Department of Transportation built new multi-level braided ramps to separate vehicles entering and exiting northbound I-405 between NE 8th Street and SR 520 in Bellevue. The goal was to allow drivers to get to and from I-405 and Eastbound SR 520 more safely and quickly, thanks to new, wide ramps. The PACE team led the stormwater, utility, TESC, and stream mitigation design for $8 million of project improvements. Design elements under our supervision were critical to meeting an aggressive project schedule. Services included stormwater system design and documentation, utility relocation design and permitting, TESC design and implementation, NPDES permit coordination, stream mitigation design, right-of-way and easement research, design logistics, construction phasing, design quality control, and interdisciplinary and interagency coordination. The PACE team’s creativity, understanding of design requirements, and ability to clearly communicate concepts and detailed design allowed for several betterments during the design process. These improvements saved over $1 million in drainage construction cost out of a total of $4 million budgeted.
