Geotechnical Work in the Coal Creek Parkway Area Begins in January
Posted on 01/04/2018

(From King County)

King County is planning to upgrade a regional sewer line that serves Bellevue and Newcastle. Starting Jan. 4, King County will begin drilling test holes in the Coal Creek Parkway area to help determine soil conditions along the recommended alignment for the new sewer line. The new sewer line will provide needed capacity to this growing area. The county is recommending a location for the new pipeline that protects the sensitive Coal Creek Natural Area, where the existing line is located.

Drilling will begin on private property and in the natural area first. Between mid-January and late February, work will occur at locations along Coal Creek Parkway (north of Newcastle city limits). It will take two to four days for crews to drill in each location. Additional test drilling will occur over two periods later in 2018. Construction of the new sewer line is currently scheduled to begin in 2021.


Here’s what you need to know to plan ahead:

• Work hours are 7 a.m. to 3:30 p.m. Monday through Friday (some drilling will occur on weekends to minimize traffic impacts)

• There will be travel lane, bicycle lane and sidewalk closures near drilling locations during work hours

• Expect equipment in the roadway and some additional noise from the drill rig; drill rigs may be parked on the roadway shoulder overnight

This is a King County project. Contact them with any questions:

• King County will post updates at:

• Call or email Monica Van der Vieren at 206-477-5502 or

• Sign up for text alerts by entering KING COALCREEK to 468-311

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