INCA provided alternatives development, analysis and screening for the selection of a preferred alternative for the development of a new transit center at Third Street between Central Way and Kirkland Avenue in Kirkland. The project will accommodate at least 8 buses (four 40’ and four 60’ long) in at least 4 bus bays.

The transit center will be developed with shelters and weather protection, signage, information, and other amenities to support riders transferring between services. Operator restrooms, passenger waiting/boarding areas, bike facilities, accessible design accommodations, and pedestrian/bike connections to the surrounding community may be included in the project.

The project will accommodate storm drainage systems, landscaping, lighting, and adjacent traffic signal/roadway improvements, and any environmental mitigation requirements that may result from environmental documentation.

Tetra Tech INCA prepared plans, specifications, and estimates for the construction of right-turn lanes and signal modifications for intersections within the City of Kirkland. The design included the addition of right-turn lanes, intersection improvements, stormwater treatment facilities, traffic signal modifications, curb, gutter and sidewalks, striping, and retaining walls. INCA conducted subsurface utility explorations at each signal pole foundation location to identify potential utility impacts prior to construction.

In 1969, the US Army Corps of Engineers designed and fabricated a floating caisson for use as a dewatering structure at various locks on the Tennessee and Cumberland Rivers. The floating caisson is used to dewater locks in order to perform maintenance, inspection, and repairs. Using one caisson and existing lock miter gates, either end of the lock can be dewatered. In order to inspect both miter gates at one time, a second closure structure is required at the other end.

Tetra Tech INCA provided final plans and specifications for the fabrication and construction of a second floating caisson at Kentucky Lock. The design included an increase of an additional 18-inch extension in height in the vertical position, provisions for lock dewatering pipes on the caisson, provisions for caisson installation at any Tennessee or Cumberland River lock without modification to the lock structures, and analyses for flotation and rotation.

The new caisson was designed so it can be installed at any Tennessee or Cumberland River Lock, where the existing caisson is used, without any modifications to the lock structures.

Tetra Tech INCA provided design for improvements to Kamber Road, between Richards Road and 137th Avenue SE. Improvements included complete design for sections of concrete sidewalk and bicycle lanes along the roadway; full width overlay with reconstruction in selected areas; design of a new bridge at East Creek; and waterline and sanitary sewer repair and replacement; and signal interconnect along the road.

The poor geotechnical conditions made relocation of utilities very difficult, potentially leading to settling of the roadway. INCA identified options that reduced the need to relocate utilities. This analysis resulted in a $500,000 reduction of overall project construction cost and shortened the construction schedule by two months.

Kamber Road was selected as APWA’s “Public Works Project of the Year” 2007.

The John Day Navigation Lock utilized a steel navigation lock lift gate which is 90 feet wide by 113 feet high, with a maximum heat of 125 feet. The gate is constructed of a series of horizontal bowstring trusses with a skin plate on the upstream side, and the trusses are spaced so that each truss receives approximately the same load. There has been many problems with welds and members cracking since 1963, when the lift gate was put into service. The gate was originally not accepted as constructed and required significant weld testing and repairs.

Tetra Tech INCA prepared an investigative report for the evaluation of cracking in the downstream John Day Navigation Lock lift gate. Cracks were located in the tension ties at the vee joint connections to the arch ribs and at the welded intersection of bracing members and diaphragm edge stiffeners. INCA evaluated the condition of the gate and provided recommendations for immediate and long-term repairs.

INCA reviewed historical data (hydrostatic and hydrodynamic as well as lifting forces), compared Ice Harbor and John Day Dams design and cracking problem similarities, and developed a reliability assessment to determine the existing gate’s remaining life. INCA provided an assessment of the existing gate condition and provided recommendations for any required emergency repairs. A 3D finite element model was developed to assess the level of stress in the members. INCA developed cost estimates for maintaining the existing gate, modifying the existing gate, and constructing a new gate.