INCA was the design engineer and construction manager for the expansion of an existing 2-bay transit center to a 4-bay transit center with a signalized intersection for the University of Washington Bothell/Cascadia Community College joint campus. Work for this project included field survey and basemapping, and the development of plans, specifications, and estimates for the improvements including curb, drainage and channelization improvements and traffic signal design. INCA provided a complete boundary survey and topographic mapping of the site, including surrounding roads and properties.

INCA Engineers, Inc., A Tetra Tech Company (INCA) completed this concept study in 2005 for the Rock Island District, which followed work previously performed in 2000 to design 118-foot long post-tensioned concrete box beams for new lower guide walls on the Upper Mississippi River. Both design efforts required close coordination with Rock Island and St. Louis Districts.

INCA prepared design criteria, developed lock concepts, evaluated the new lock alternatives, prepared preliminary construction schedules (including considerations of required closures of the existing lock), and completed quantity take-off and planning level cost estimates. INCA recommended a lift-in precast concrete alternative for the new lock wall designs, and this general concept was selected as the basis for future design phases. In performance evaluations for this task order, INCA received an overall rating of Excellent and our design services were rated at Outstanding in all categories.

INCA Engineers, Inc., A Tetra Tech Company (INCA) as part of the design team developed structural designs for the University Street Underground Transit Station. The station is located approximately 70 feet below-ground and includes ancillary structures such as station entrances, vent structures, traction power substation, and underpinning of existing buildings. INCA prepared the preliminary and final plans for this underground station, approximately 573 feet in length.

The area surrounding Union Hill Road and the Union Hill Road/Avondale Road intersection has developed rapidly and continues to grow. Union Hill Road serves as a key route to the Novelty Hill Urban Planned Developments to the east. The project’s objectives were to increase the capacity, level of service, and safety for all transportation modes and retain the character of both corridors by minimizing impacts to the surrounding environment.

INCA completed the design in two phases. The first phase of this project included updating the previous design reports and reviewing alternative channelization for the intersection along with preliminary design. The second phase involved the design of the preferred channelization alternative through final PS&E including: modifying channelization of Union Hill Road and Avondale Road at the intersection, including bike lanes on Union Hill Road; improving roadway illumination; providing intersection pavement upgrades at Avondale Road-Union Hill Road; underground overhead utilities; working with property owners to assist the City with right-of-way and easement acquisitions; coordinating with Transportation Improvement Board (TIB), King County and WSDOT; and working with property owners adjacent to the roadway to ensure the community’s concerns are identified.

INCA Engineers, Inc., A Tetra Tech Company (INCA) performed detailed designs and prepared construction drawings and specifications for Tieton Hydropower, LLC for this two-unit, 18 MW hydroelectric power plant located on the outlet works of the existing US Bureau of Reclamation (USBR) Tieton Dam. INCA reviewed all contractors’ manufacturer drawings and provided equipment inspections at sites within the US and China. INCA provided construction monitoring and commissioning and testing assistance.

The project includes the installation of ultrasonic flow meters on the existing penstocks and the relocation of two existing 6-foot diameter jet flow valves and integration of the jet flow valve controls with the turbine governors so that the Jet flow valves can be operated to regulate the flow releases when one or both units are down for maintenance or when the required releases are outside the range of flows that can be passed through the units. INCA’s work included structural analysis and several generation studies for selection, sizing and optimization of energy production.