North Boeing Field Georgetown Steam Plant

Facility Site ID: 2050 Cleanup Site ID: 4765

Public Comment Period November 07, 2022-December 21, 2022

Last updated: 11/3/2022

Language Information Below
Información en español incluida
中文信息包括
Có thông tin bằng tiếng Việt
ព័ត៌មានជាភាសាខ្មែររួមបញ្ចូល

Fact Sheets Information in English Información en español incluida   中文信息包括
 Có thông tin bằng tiếng Việt
ព័ត៌មានជាភាសាខ្មែររួមបញ្ចូល 

Blog  "Cleaning up:  Two Lower Duwamish sites move forward with cleanup"

Comments Submit Comment View Comments

Review Documents Interim Action Work Plan SEPA Determination

Online Meeting Register and Join Presentation

Wednesday, November 9

6:30 - 7:30 p.m.:  Presentation
7:30 pm:  Questions and answers, as needed

Ecology will host an online public meeting using the Zoom platform to provide project information and answer questions. There will be interpreters available in Spanish, Chinese, Vietnamese, and Khmer.

Call-in options are available when registering from link above.

Current Status

Aerial view of the North Boeing Field Georgetown Steam Plant site and Dog Park Project Area
Aerial view of the North Boeing Field Georgetown Steam Plant site and Dog Park Project Area

Last Updated:  October 2022

Documents ready for public review
Ecology invites you to review a draft Interim Action Work Plan for the North Boeing Field-Georgetown Steam Plant Cleanup Site (Site).  The City of Seattle plans to develop a portion of the Georgetown Steam Plant property into an off-leash pet area and pedestrian path. This project, referred to here as the Georgetown Flume Dog Park Project Area, is located east of 1001 S. Myrtle St between Myrtle St and East Marginal Way. The City of Seattle is conducting this Interim Action under a 2008 legal agreement (Agreed Order) with Ecology.

Ecology would like your input on the following documents:

Language Information
Para ver una copia de este boletín informativo en español visite: https://bit.ly/Ecology-NorthBoeingField, llame (360) 407-6097, o envié un correo electrónico a preguntas@ecy.wa.gov

如需瀏覽中文版的概況介紹,請訪問網址https://bit.ly/Ecology-NorthBoeingField,致電 
(425) 457-3842,或發送電子郵件到sunny.becker@ecy.wa.gov

Để xem bản sao của tờ thông tin này bằng tiếng Việt, hãy truy cập: https://bit.ly/Ecology-NorthBoeingField, gọi (360) 790-4730, hoặc gửi email đến Lngu461@ecy.wa.gov

ដើម្បីមើលឯកសារថតចម្លងនៃអង្គហេតុនេះជាភាសាខ្មែរ សូមចូលមើល៖ https://bit.ly/Ecology-NorthBoeingField, ហៅទូរស័ព្ទលេខ (425) 324-5901, ឬអ៊ីម៉ែល ian.fawley@ecy.wa.gov

Why This Site Matters

View of Lower Duwamish Waterway
View of Lower Duwamish Waterway
The North Boeing Field Georgetown Steam Plant site is adjacent to the Lower Duwamish Waterway (LDW) Superfund Site, which includes a 5-mile stretch of the Duwamish River. The U.S. Environmental Protection Agency (EPA) added the LDW Superfund Site to the Superfund National Priorities List in 2001. Ecology is working to stop or reduce sources of contamination to the LDW Superfund Site, an effort known as “source control,” so that the EPA can proceed with the cleanup of the river sediment. 

Georgetown Flume Dog Park Project

North Boeing Field Georgetown Steam Plant, Flume Dog Park Project Area
North Boeing Field Georgetown Steam Plant, Flume Dog Park Project Area

Project area background
This 1.1 acre Georgetown Flume Dog Park Project Area extends from Myrtle Street south to East Marginal Way, just east of Ellis Ave South in the Georgetown neighborhood of Seattle.  The area is on the margin of the 115.6 acre North Boeing Field-Georgetown Steam Plant Site.  The Site is in the remedial investigation process (see cleanup graphic below). Additional details about ongoing cleanup actions at the larger Site can be found on the Ecology’s North Boeing Field Georgetown Steam Plant  webpage. 

The Dog Park Project Area was the location of the southern end of the Georgetown Steam Plant Flume.  The flume was a pipe and ditch system that discharged water from the historical steam plant to Slip 4 of the Lower Duwamish Waterway (LDW) until the 1960’s.  The Dog Park Project Area also contained the former Ellis Ave. electrical substation, which along with the remnants of the flume, were removed in 2009.  Currently, the Dog Park Project Area is an undeveloped parcel covered with vegetation, bare dirt, and gravel.  This interim action will allow beneficial public use of the Dog Park Project Area while the Site-wide RI and feasibility study are completed.

Contaminates of concern
These contaminants may be present in soils at concentrations that exceed screening standards set under the state’s cleanup law, the Model Toxics Control Act (MTCA ), and must be addressed. 

  • Polychlorinated biphenyls (PCBs)
  • Carcinogenic polycyclic aromatic hydrocarbons (cPAHs)
  • Metals

Current interim action and future land use 
The objective of this interim action is to remove readily accessible soil that contains chemicals of concern at concentrations greater than MTCA direct contact screening levels for unrestricted site use.  Residual soils related to Dog Park Project Area contamination and historical industrial uses will be removed to a minimum depth of 1-2.5 feet and transported to a licensed disposal facility.  Once the excavation has been completed, the Dog Park Project Area will be backfilled with clean soil and redeveloped into a community amenity featuring an off-leash pet area, bicycle/pedestrian path, and bioswale.  The Dog Park Project Area chemicals of concern were not detected in groundwater samples, indicating there is low likelihood of leaching to groundwater from the vicinity soils. 

General Cleanup Process

The Model Toxics Control Act (MTCA) is Washington’s environmental cleanup law. It provides requirements for contaminated site cleanup and sets standards that protect human health and the environment. Ecology enacts the MTCA and oversees cleanups. The MTCA site cleanup process is completed in steps (see graphic below) over a variable timeline.

What Happens Next?

Ecology will consider all comments received during this public comment period and may make changes to the Interim Action Work Plan or SEPA Determination of Non-Significance.  If the documents require significant changes, we will hold another public comment period.  If no significant changes are made, Ecology will finalize the documents and the City of Seattle will proceed with the Interim Action.

Public Participation

Current North Boeing Field Georgetown Steam Plant cleanup site Public Participation Plan

This plan includes information for the public regarding opportunities to get involved in the Site cleanup process. The outreach activities and mechanisms presented reflect Ecology’s current plans for keeping the public informed and for receiving information and comments from the public. 

Site Information

Approximate site boundary is in orange.  Click on image to enlarge it.
Approximate site boundary is in orange. Click on image to enlarge it.

Site location

The North Boeing Field and Georgetown Steam Plant Site is located in an industrial area on the east side of the Lower Duwamish Waterway. It is bordered to the southwest by East Marginal Way South, to the east by King County International Airport, and to the northwest by Ellis Avenue South. On the other side of Ellis Avenue South is a residential neighborhood.

The Lower Duwamish Waterway drainage basin is divided into source control areas. This site is located within the Slip 4 Early Action Area (river mile 2.8) source control area along the east bank of the river.




Site History

Georgetown Steam Plant


In 1906, Seattle Electric Company built the Georgetown Steam Plant (GTSP) along the Duwamish River to provide power during periods of high electricity use.  After 1912, use of the steam plant decreased under Puget Power ownership. The City of Seattle acquired the plant in 1951 and operated it on standby until it was fully decommissioned in 1973.
 
The GTSP is a National Historic Landmark. The City still owns the 7.29-acre property and operates a historical museum there.
 
When built, the GTSP was next to the Duwamish River. When that part of the river was straightened in 1913 to form the Duwamish Waterway, the GTSP Flume was constructed to carry cooling water to Slip Four.

North Boeing Field

King County owns most of North Boeing Field (NBF). Boeing leases about 117 acres from King County, and owns the improvements it has built on the property. Boeing has operated at North Boeing Field since the 1940s for aircraft and aerospace manufacturing, maintenance, and research.


Contamination


Contamination at the site is most likely the result of industrial operation and maintenance activities performed on this site since the 1940’s.
 
In soil, the contaminants of concern are:

  • Polychlorinated biphenyls (PCBs)
  • Total petroleum hydrocarbons (TPH)
  • Polynuclear aromatic hydrocarbons (PAHs)
  • Metals (Antimony, arsenic, cadmium, chromium, copper, lead, mercury, and zinc)

In groundwater, the contaminants of concern are:

  • Total petroleum hydrocarbons (TPH)
  • Volatile and semi-volatile organic compounds (VOCs and SVOCs)
  • Metals (Antimony, arsenic, chromium, and lead)


In stormwater solids, the contaminants of concern are:

  • Polychlorinated biphenyls (PCBs)
  • Polynuclear aromatic hydrocarbons (PAHs)
  • Semi-volatile organic compounds (SVOCs)
  • Metals (Arsenic, copper, lead, mercury, and zinc)


In Slip 4 sediments, the contaminants of concern are:

  • Polychlorinated biphenyls (PCBs)
  • Semi-volatile organic compounds (SVOCs)
  • Metals



Previous cleanup work

EPA’s Early Action cleanup in Slip 4 was completed in 2012. As part of this project, Boeing and the City removed debris and cleaned up sediments in the Slip. Boeing also installed a stormwater treatment system to remove solids from the stormwater draining off the northern portion of the site. This area had very high levels of PCBs, due to the historical handling of electrical transformer oil and aircraft hydraulic oil. Controlling this runoff made a significant difference in the amount of PCBs reaching the river.
 
In 1985 and 2006, the City independently removed PCB-contaminated soil from the southwest portion and southern boundary of the GTSP property. This portion of the site is referred to as the low-lying area because surface water historically flowed into this region from portions of the GTSP and offsite areas.
 
In 2009, the City independently cleaned up and replaced the GTSP Flume, which was known to be a source of contamination to the river.
 
2011, Boeing conducted an Interim Action to remove accessible PCB-contaminated soil along the fence line adjacent to the Steam Plant.
 
Also In 2011, the City and Boeing conducted an Interim Action under the direction of Ecology to remove soil contaminated with PCBs and petroleum from the low-lying area near the GTSP, which had the potential to move offsite and contaminate Slip 4. They also capped areas where the soil was contaminated with other chemicals.
 
Boeing continues to make progress on a large scale effort to remove PCB-contaminated materials such as caulk, paint, building materials, and surface debris. EPA regulated this action is under the federal Toxic Substances Control Act.
 
Since 2010, Boeing has removed thousands of linear feet of PCB-contaminated concrete joint material from the site, and re-sealed the joints. They have also cleaned, repaired, and replaced many of the storm drains on the north end of the property.

Legal 2
Public Information 12
State Environmental Policy Act 1
Document Title Document Date Document Type
North Boeing Field/Georgetown Steam Plant - Interim Action SEPA Determination - October 2022 10/5/2022 SEPA Documents
Technical Reports 50
Document Title Document Date Document Type
North Boeing Field/Georgetown Steam Plant - Draft Interim Action Work Plan - September 2022 9/30/2022 Interim Action Documents
3-322 Building Pavement Drainage Improvement and Storm Drain Upgrade 5/17/2022 Site Specific Technical Document - other
3-322 Building Flooding Trench Drain Repair Work Plan 3/1/2022 Site Specific Technical Document - other
North Boeing Field Georgetown Steam Plant - Ecology Project Coord Change Letter 3/22/2021 Site Specific Administrative Document - other (Administrative correspondence)
Data Report Phase 3 Groundwater Investigation, NBF/GTSP Remedial Investigation 7/11/2018 Remedial Investigation Report
TSCA Material Characterization and Removal Plan 8/3/2016 Site Specific Technical Document - other
North Boeing Field/Georgetown Steam Plant Site RI/FS SAP/QAPP Addendum No. 4 10/29/2015 Sampling and Analysis Plan
North Boeing Field/Georgetown Steam Plant RI/FS SAP/QAPP Addendum No. 3 10/12/2015 Sampling and Analysis Plan
North Boeing Field/Georgetown Steam Plant Site RI/FS SAP/QAPP Addendum No. 2 8/18/2015 Sampling and Analysis Plan
North Boeing Field/Georgetown Steam Plant Site RI/FS SAP/QAPP Addendum No. 1 2/19/2015 Sampling and Analysis Plan
Annual Performance Evaluation Report Long-Term Stormwater Treatment - 2013-2014 North Boeing Field Seattle, Washington 2/19/2015 Performance/Confirmational Monitoring Plan or Report
Addendum No. 1 North Boeing Field/Georgetown Steam Plant Site Remedial Investigation/Feasibility Study Sampling and Analysis Plan and Quality Assurance Project Plan Seattle, Washington 2/19/2015 Sampling and Analysis Plan
Addendum No. 1 North Boeing Field/Georgetown Steam Plant Site Remedial Investigation/Feasiblity Study Work Plan Seattle, Washington 2/9/2015 Remedial Investigation Work Plan
Health and Safety Plan Remedial Investigation/Feasibility Study North Boeing Field/Georgetown Steam Plant Seattle, WA 2/3/2015 Health and Safety Plan
Self-Implementing TSCA Cleanup Substation V-94 Removal and Disposal North Boeing Field Seattle, Washington 1/28/2015 Site Specific Technical Document - other
Technical Memorandum 3-333 Building Interim Action 2014 Groundwater Compliance Monitoring Results North Boeing Field, Seattle, Washington 10/17/2014 Groundwater Monitoring Report
Technical Memorandum Fenceline Area Interim Action 2014 Groundwater Compliance Monitoring Results North Boeing Field, Seattle, Washington 10/17/2014 Groundwater Monitoring Report
North Boeing Field/Georgetown Steam Plant RI/FS Health and Safety Plan 5/1/2014 Health and Safety Plan
North Boeing Field/Georgetown Steam Plant RI/FS Sampling and Anslysis Plan and Quality Assurance Project Plan, Figures 4/1/2014 Sampling and Analysis Plan
North Boeing Field/Georgetown Steam Plant RI/FS Sampling and Analysis Plan and Quality Assurance Project Plan, Text, Tables, Appendices 4/1/2014 Sampling and Analysis Plan
Annual Performance Evaluation Report Long-Term Stormwater Treatment - 2012-2013 North Boeing Field Seattle, Washington 3/7/2014 Performance/Confirmational Monitoring Plan or Report
North Boeing Field/Georgetown Steam Plant Remedial Investigation/Feasiblity Study Work Plan Appendix B Data Tables - FINAL 11/11/2013 Remedial Investigation Work Plan
North Boeing Field/Georgetown Steam Plant Remedial Investigation/Feasibility Study Work Plan Volume II Figures - FINAL 11/11/2013 Remedial Investigation Work Plan
North Boeing Field/Georgetown Steam Plant Remedial Investigation/Feasiblity Study Work Plan Volume I Text, Appendix A, Tables - FINAL 11/11/2013 Remedial Investigation Work Plan
North Boeing Field/Georgetown Steam Plant Final 2011-2012 Stormwater Monitoring Data Report 9/27/2013 Site Specific Technical Document - other
Annual Performance Evaluation Report Long-Term Stormwater Treatment 2011 - 2012 North Boeing Field, Seattle, Washington 3/4/2013 Performance/Confirmational Monitoring Plan or Report
North Boeing Field/Georgetown Steam Plant Site Remedial Investigation/Feasibility Study Work Plan - DRAFT 4/17/2012 Remedial Investigation Work Plan
North Boeing Field/Georgetown Steam Plant Site RI/FS 2010-2011 Stormwater Sampling Data Report 1/2/2012 Site Specific Technical Document - other
North Boeing Field Building 3-333 Soil Excavation Work Plan Signed Approval Letter 6/10/2011 Site Specific Technical Document - other
Final Draft Interim Action Work Plan 2011 3-333 Building Soil Excavation North Boeing Field Seattle, Washington 6/9/2011 Site Specific Technical Document - other
Georgetown Steam Plant Screening Levels and Interim Action Work Plan Approval Letter 6/7/2011 Site Specific Technical Document - other
North Boeing Field Fenceline Interim Action Final Draft Work Plan Approval Letter 6/6/2011 Site Specific Technical Document - other
Georgetown Steam Plant Interim Action Technical Memorandum on Data Screening Response to Comments 6/2/2011 Site Specific Technical Document - other
Georgetown Steam Plant Interim Action Work Plan 6/2/2011 Site Specific Technical Document - other
Final Draft Interim Action Work Plan 2011 Fenceline Area Soil Excavation North Boeing Field Seattle, Washington 6/2/2011 Site Specific Technical Document - other
Slip 4 Interim Source Control Status Report March 2011 5/10/2011 Site Specific Technical Document - other
Georgetown Steam Plant Interim Action Technical Memorandum on Data Screening 3/25/2011 Site Specific Technical Document - other
Removal Action Work Plan Short-Term Stormwater Treatment North Boeing Field Seattle, Washington 1/7/2011 Site Specific Technical Document - other
North Boeing Field/Georgetown Steam Plant Site RI/FS Expanded Stormwater Sampling Interim Data Report (Updated) 1/3/2011 Site Specific Technical Document - other
North Boeing Field/Georgetown Steam Plant Site RI/FS Expanded Stormwater Sampling Interim Data Report (Updated) Appendix D Data Validation Report 1/1/2011 Site Specific Technical Document - other
North Boeing Field/Georgetown Steam Plant Site RI/FS Expanded Stormwater Sampling Interim Data Report (Updated) Appendix C Laboratory Data Reports 1/1/2011 Site Specific Technical Document - other
North Boeing Field/Georgetown Steam Plant Site RI/FS Expanded Stormwater Sampling Interim Data Report (Updated) Appendix A Totalizer Logs; Appendix B Monthly Precipitation Summaries 1/1/2011 Site Specific Technical Document - other
North Boeing Field/Georgetown Steam Plant Site RI/FS Expanded Stormwater Sampling Interim Data Report (Updated) Tables 1/1/2011 Site Specific Technical Document - other
North Boeing Field/Georgetown Steam Plant Site RI/FS Expanded Stormwater Sampling Interim Data Report (Updated) Figures 1/1/2011 Site Specific Technical Document - other
North Boeing Field/Georgetown Steam Plant Site RI/FS Expanded Stormwater Sampling Interim Data Report (Updated) Text 1/1/2011 Site Specific Technical Document - other
Report: Concrete Joint Removal, North Boeing Field, Seattle, Washington 11/9/2010 Site Specific Technical Document - other
North Boeing Field/Georgetown Steam Plant Site RI/FS Assessment of Infiltration and Inflow to the North Boeing Field Storm Drain System Volumes I and II 7/14/2010 Site Specific Technical Document - other
Report: Storm Drain Structure and Surface Cleanup, North Boeing Field, Seattle, Washington 6/18/2010 Site Specific Technical Document - other
North Boeing Field/Georgetown Steam Plant Site RI/FS Preliminary Stormwater Sampling Interim Data Report 5/3/2010 Site Specific Technical Document - other
North Boeing Field and Georgetown Steam Plant Supplemental Report: Summary Of Existing Information and Identification of Data Gaps, Volumes I and II 8/3/2009 Site Specific Technical Document - other
There may be more documents related to this site. To obtain documents not available electronically, you will need to make a public records request.

Places to see print documents

  • Northwest Regional Office
    15700 Dayton Ave N
    Shoreline, 98133
    Please schedule an appointment to view print documents at this location.
  • South Park Branch / Seattle Public Library
    8604 Eighth Avenue South
    Seattle, 98108
    This location may only have print documents available during open comment periods.

Contaminants 14

Contaminant Type
Soil
Groundwater
Surface Water
Air
Sediment
Bedrock
Halogenated Organics - Halogenated Organics C C S
Metals - Metals Priority Pollutants C C S
Metals - Metals - Other S S S
Halogenated Organics - Polychlorinated biPhenyls (PCB) S C S S
Non-Halogenated Organics - Petroleum Products-Unspecified C C S
Non-Halogenated Organics - Non-Halogenated Solvents C C S
Halogenated Organics - Dioxins/Furans S C S
Halogenated Organics - Halogenated Solvents C
Reactive Wastes - Corrosive Wastes C B S
Other Contaminant - Conventional Contaminants, Inorganic C C S
Non-Halogenated Organics - Benzene C
Non-Halogenated Organics - Petroleum-Diesel C
Non-Halogenated Organics - Petroleum-Gasoline C
Non-Halogenated Organics - Petroleum-Other C
S
Suspected
C
Confirmed Above Cleanup Levels
B
Below Cleanup Levels
RA
Remediated-Above
RB
Remediated-Below
R
Remediated
This contaminant list was based on our best information at the time it was entered. It may not reflect current conditions at the site.