Denver: Design Engineer and construction support for a ramp from I-25 to Colfax Viaduct. This included roadway, high retaining walls, the widening of two existing cast-in-place concrete structures, and a cast-in-place post-tensioned, curved, box girder ramp structure. Project Cost: $4.3 Million. Contact: John Knopp, Project Manager, (303) 757-9269 or P.K. Padhiar (303) 757-9486.