U District: Installing ground settlement monitors

Publish Date

Construction crews building the U District Station will be installing ground settlement monitors near the light rail station construction site this spring.

The underground monitors, called extensometers, will be installed to a depth of about 50 feet below ground. The equipment will monitor ground movement during construction of the light rail tunnels.

The monitors will be installed in several locations in the U District over the next few months. The approximate locations are shown on the adjacent map.

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What to expect

  • Installation requires drilling into the asphalt or concrete, removing ground material with a vacuum truck and installing the monitor.
  • Work hours are typically 7 a.m. to 5 p.m.
  • Equipment includes a drill rig and truck.
  • Drilling will take approximately 1 to 2 days at each location.
  • Drilling will sound similar to a truck running with occasional hammering sounds.
  • Noise from the vactor truck while soil material is being removed (during the first few feet of drilling at each location).
  • Pedestrian, bicyclist, and vehicular traffic will be maintained. Some locations may require temporary lane, sidewalk, or alley closures. There may also be impacts to street parking. Traffic cones, No Parking signage, and traffic signage will be used when travel lanes or parking areas are affected during this work.
  • Drill rigs may be temporarily stationed on city streets overnight during this work.

For More Information 
Phone: Contact Paige Cureton, (206) 398-5300
Email: northlink@soundtransit.org
Construction Hotline: For issues that need immediate attention after normal business hours, call Sound Transit's 24-hour construction hotline: 1 (888) 298-2395.

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