North Seattle Lateral Upgrade

Project Description 

Northwest Pipeline LLC, a Williams company, is proposing to remove and replace up to 5.85 miles of the existing 8-inch diameter North Seattle mainline lateral and replace it with 20-inch diameter pipe. Subsequent phases of the North Seattle Later Upgrade Project (Project) include: upgrading the existing North Seattle/Everett delivery meter station for the higher capacity line; installing a new mainline valve; and installing a new pig launch/receiver site at the terminus of the 20-inch pipeline.  The project will provide an additional 159,299 dekatherms per day of delivery capacity on the existing North Seattle Delivery Lateral system as request by Puget Sound Energy (PSE).

Project Chronology

01/25/18    Original permit applications submitted to PDS

04/27/18    1st review letter sent to applicant

10/24/18    DNS threshold determination issued

11/14/18    DNS withdrawn

11/30/18    2nd review letter to applicant

01/23/19    Received response from applicant re: 2nd review letter

03/06/19    MDNS issued

03/06/19    Adoption of FERC NEPA documents

03/20/19    MDNS comment/appeal period expires

Key Project Documents                                                                                                     

County Permit Applications (01/25/18)

  • Land Disturbing Activity                   18 121944 LDA
  • Land Disturbing Activity                   18 121994 LDA
  • Forest Practices Activity                  18 121972 FPA
  • Flood Hazard                                   18 121979 FHZ
  • Retaining Wall                                  18 121974 CBP

Vicinity map

Pipeline Alignment plan set original (01/25/18)

State Environmental Policy Act (SEPA) Checklist (01/25/18)

1st PDS Review letter (04/27/18)

2nd PDS Review letter (11/30/18)

Combined Notice of Determination of Non-Significance (DNS) and Decision (10/24/18)

DNS  (10/24/18)

Notice withdrawing DNS (11/14/18)

Applicant response to 2nd PDS review letter addressing Greenhouse Gas Emissions & Safety (1/23/19)

Current Pipeline Alignment plan set (02/23/19)

Combined Notice of Mitigated Determination of Non-Significance (MDNS) and Type 1 Decisions (03/06/19)

MDNS (03/06/19)

Notice of adoption of Existing Environmental Documents (03/06/19)

Map Area Detail

Environmental Review and Threshold Determination

PDS staff reviewed the applicant's State Environmental Policy Act (SEPA) Environmental Checklist, as well as documents and plans submitted with the application. Based on this information, PDS issued and published a combined Notice of Mitigated Determination of Non-significance (MDNS), SEPA Threshold Determination, and Notice of Decision to approve the applicant’s permits on March 6, 2019





Appeal opportunities

The MDNS may be appealed pursuant to the requirements of Section 30.61.300 of Snohomish County Code (SCC) and Chapter 2.02 SCC.  The fourteen (14) day appeal period commences on the date of publication notice, March 6, 2019.  Appeals must be received on or before March 20, 2019.  The appeal must contain the items set forth in Section 30.71.050(5) SCC as follows:

  • Facts demonstrating that the person is aggrieved by the decision;
  • A concise statement identify each alleged inadequacy in the threshold determination;
  • The specific relief requested; and
  • Any other information reasonable necessary to make a decision on appeal.

How to Get Involved

To submit comments or become a Party of Record for this project, you can send a letter or email to the Permit Project Manager, Randy Middaugh, at the address below.  Be sure to include the file number, and your name and address in your correspondence.  Read more about what it means to be a Party of Record.

PDS Project Contact

Randy Middaugh | Principal Planner

Snohomish County Planning and Development Services

3000 Rockefeller Ave M/S 604, Everett, Wa. 98201

425-262-2306 | Email Randy