Sound Transit I-5 Undercrossing Pits

South Kirkland Park & Ride
September 29, 2017
Pacific Highway South HOV Lanes
September 29, 2017

Location: Seattle, Washington

This contract involved the construction of four construction pits bound by cylinder piles and reinforced concrete wall; two pits located in the Olive Way Interstate Route 5 (I-5) northbound off ramp and two pits located in the Pine-Pike Reversible HOV ramp.

Services Provided:

ORA was engaged to provide geotechnical construction monitoring services, as well as construction inspection and materials testing services for the following items:

  • Tieback grout
  • Soil compaction
  • Asphalt compaction
  • Reinforced concrete
  • Controlled density fill (CDF)
  • Structural steel fabrication and erection
  • Nondestructive testing of welds

In addition to our specific inspection tasks, ORA provided a daily report documenting site activities to include equipment used, subcontractor activities, materials received, etc. Due to the project logistics and fast-track schedule, ORA’s personnel were working two to three shifts – day, swing, night – as required. Testing and inspections were performed in accordance with Sound Transit, City of Seattle, and WSDOT Standard Specifications.