Facility Site ID: 139 Cleanup Site ID: 2876

Site Status - July 2021

Gas Works Park in Seattle
Gas Works Park in Seattle

Under a legal agreement with the Department of Ecology (Ecology), Puget Sound Energy (PSE) and the City of Seattle (City) are developing an environmental report for the Gas Works Park site. 

The report will:
 
• summarize investigations and cleanup actions performed to date
• describe remaining contaminated areas that require cleanup (mainly Lake Union sediment)
• identify and evaluate alternatives for addressing the remaining areas


The report should be ready for public review in Spring 2022.


Site Information

Site Description

The Gas Works Park site is approximately 42 acres located at 2101 North Northlake Way in Seattle, Washington. It includes about 21 acres of upland property and 21 acres of property within Lake Union. Most of the upland portion of the site is owned by the City and most of the in-water portion is owned by the State of Washington.

Contamination

Contamination at the site is mainly the result of historic gas manufacturing and tar refining operations. Contaminants include petroleum hydrocarbons, polycyclic aromatic hydrocarbons, volatile organic compounds, and arsenic.

Previous Cleanup Work

Under various legal agreements with Ecology over the years, PSE and the City have implemented multiple cleanup actions to address contamination in the upland portion of the site. These actions included soil removal, soil capping and groundwater treatment.

As a result, the in-water sediment portion of the site is the main area still requiring cleanup. Please click on the photo for a larger view

Please click on the photo for a larger view

Site use restrictions called institutional controls are in effect

Institutional controls can be fences, signs, or restrictions on how the property is used. For instance, an institutional control may prohibit installing drinking water wells or disturbing a protective cap that isolates contamination. These restrictions keep the contamination contained and keep people from being exposed to the contamination. The controls are usually listed in environmental covenants recorded with the county.

Periodic reviews are required when institutional controls are required at a site. Ecology conducts reviews to make sure the controls remain effective and the cleanup still protects human health and the environment. We conduct periodic reviews about every five years.

Environmental Covenant

County Recording #: 20050505001726
County Recording Date: 5/5/2005

Covenant Restrictions

  • Ongoing Maintenance of Remedy
  • Prohibit Removal or Alteration of Existing Buildings
  • Prohibit Soil Disturbance
  • Restrict All Ground Water Extraction/Well Installation

Media Restrictions

  • Groundwater
  • Soil

Environmental Covenant

County Recording #: 20050505001727
County Recording Date: 5/5/2005

Covenant Restrictions

  • Ongoing Maintenance of Remedy
  • Prohibit Removal or Alteration of Existing Buildings
  • Prohibit Soil Disturbance
  • Restrict All Ground Water Extraction/Well Installation

Media Restrictions

  • Groundwater
  • Soil
Legal 12
Document Title Document Date Document Type
Gas Works Park - Agreed Order 3rd Amendment - Final 10/16/2017 Agreed Order Amendment
Gas Works Park - Agreed Order 2nd Amendment - Final 4/26/2017 Agreed Order Amendment
Gas Works Park Sediments - Modification of Agreed Order DE 2008 3/13/2013 Agreed Order
Restrictive Covenant, City of Seattle - Gas Works Park & Seattle Police Harbor Patrol Property 5/5/2005 Environmental Covenant; Alternative Mechanism
Restrictive Covenant, City of Seattle - Gas Works Park 5/5/2005 Environmental Covenant; Alternative Mechanism
Gas Works Park - Amendment No. 1 To Consent Decree 5/1/2005 Consent Decree - Amendment
Gas Works Park - Agreed Order# 2008 3/18/2005 Agreed Order
Gas Works Park - AO Remedial Action 3/18/2005 Agreed Order
Gas Works Park - Consent Decree 11/30/1999 Consent Decree
Gas Works Park Consent Decree 10/22/1999 Consent Decree
Gas Works Park - Restrictive Covenant 1/1/1999 Environmental Covenant; Alternative Mechanism
Gas Works Park - AO Remedial Action 7/31/1997 Agreed Order
Public Information 17
Document Title Document Date Document Type
Gas Works Park - Fact Sheet - Interim Action Fall 2017 9/11/2017 Fact Sheet\Public Notices
Gas Works Park - Fact Sheet- March 2017 3/17/2017 Fact Sheet\Public Notices
EJSCREEN Census Block Map Gas Works Park 12/29/2016 Fact Sheet\Public Notices
EJSCREEN Report Gas Works Park 12/29/2016 Fact Sheet\Public Notices
EJSCREEN ACS Summary Report Gas Works Park 12/29/2016 Fact Sheet\Public Notices
Gas Works Park Update 9/10/2014 Fact Sheet\Public Notices
Gas Works Park - Supplemental Investigation Begins at Gas Works Park March 2013 3/5/2013 Fact Sheet\Public Notices
Gas Works Park - Operations & Maintenance of remedial actions Nov 2012 fact sheet 11/8/2012 Fact Sheet\Public Notices
Gas Works Park - SEPA Fact Sheet (June 2012) 6/15/2012 Fact Sheet\Public Notices
Gas Works Park - Fact Sheet Hydrogeological Investigation 9/1/2010 Fact Sheet\Public Notices
Gas Works Park Fact Sheet Investigation Begins September 17 at Gas Works Park 9/1/2007 Fact Sheet\Public Notices
Gas Works Park Fact Sheet Investigation Begins September 19 at Gas Works Park 9/1/2006 Fact Sheet\Public Notices
Gas Works Park Fact Sheet consent decree amendment and Ecology review of site cleanup performance 5/1/2005 Fact Sheet\Public Notices
Gas Works Park Public Participation Plan 3/1/2005 Public Participation Plan
Gas Works Park Fact Sheet Draft agreed order 3/1/2005 Fact Sheet\Public Notices
Gas Works Park - Addendum to the Public Participation Plan 12/1/1999 Public Participation Plan
Gas Works Park Public Participation Plan 4/1/1997 Public Participation Plan
State Environmental Policy Act 6
Document Title Document Date Document Type
SEPA Determination of Non-Significance - Addendum 9/11/2017 SEPA Documents
Play Area SEPA Figures 2/27/2017 SEPA Documents
SEPA Determination of Nonsignificance 2/24/2017 SEPA Documents
Play Area SEPA Checklist Updated 2/22/2017 SEPA Documents
Gas Works Park - Determination of Non-Significance (June 2012) 6/15/2012 SEPA Documents
Gas Works Park - SEPA Checklist (June 2012) 6/15/2012 SEPA Documents
Technical Reports 31
Document Title Document Date Document Type
Gas Works Park - Monthly Progress Report - March 2019 3/19/2019 Progress Report
Gas Works Park - Monthy Progress Report - January 2019 1/31/2019 Progress Report
Gas Works Park - Monthly Progress Report - December 2018 12/3/2018 Progress Report
Gas Works Park - Interim Action - Sampling Analysis and Quality Assurance Plan - Addendum 4 11/15/2017 Interim Action Documents
Gas Works Park - Monthly Progress Report - October 2017 11/14/2017 Progress Report
Gas Works Park - Interim Action Workplan - Final 8/1/2017 Interim Action Documents
Gas Works Park - Monthly Progress Report - June 2017 7/21/2017 Progress Report
Gas Works Park - Monthly Progress Report - May 2017 6/22/2017 Progress Report
Gas Works Park - Monthly Progress Report - January 2017 2/23/2017 Progress Report
Gas Works Park - Monthly Progress Report - December 2016 1/26/2017 Progress Report
Gas Works Park - Technical Memorandum - Play Area Injection Infrastructure-Groundwater Monitoring Well Network 12/19/2016 Site Specific Technical Document - other
Gas Works Park - Monthly Progress Report - November 2016 12/16/2016 Progress Report
Gas Works Park - Monthly Progress Report - October 2016 11/17/2016 Progress Report
Gas Works Park - Monthly Progress Report - September 2016 10/21/2016 Progress Report
Gas Works Park - Monthly Progress Report - August 2016 9/22/2016 Progress Report
Gas Works Park - Monthly Progress Report - July 2016 8/22/2016 Progress Report
Gas Works Park - Monthly Progress Report - June 2016 7/20/2016 Progress Report
Gas Works Park - Monthly Progress Report - May 2016 6/22/2016 Progress Report
Gas Works Park - Monthly Progress Report - April 2016 5/17/2016 Progress Report
Gas Works Park - Monthly Progress Report - March 2016 4/21/2016 Progress Report
Feasibility Study Bridging Document Appendix H 10/11/2013 Feasibility Study
Feasibility Study Bridging Document - Appendix F 10/11/2013 Feasibility Study
Feasibility Bridging Document Gas Works Park - 2013 10/11/2013 Feasibility Study
Gas Works Park - Supplemental Investigation Work Plan 3/13/2013 Site Specific Technical Document - other
Gas Works Park - Draft Supplemental Investigation Work Plan 2/27/2013 Remedial Investigation Work Plan
Gas Works Park - NE Corner Capping Project 90% design (Sept. 2012) 8/29/2012 Site Specific Technical Document - other
Gas Works Park - Surface Soil PAH (Jan 2010) 1/4/2010 Site Specific Technical Document - other
Gas Works Park - NE Corner Chemical Analysis Data Memo (May 2008) 5/5/2008 Site Specific Technical Document - other
Gas Works Park - NE Corner Investigtion Data Report (April 2008) 4/25/2008 Site Specific Technical Document - other
Gas Works Park Periodic Review 4/1/2005 Periodic Review (5 Year)
Gas Works Park Sediment Area - Area of Investigation 6/3/2004 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.
  • Fremont Public Library
    731 N 35th Street
    Seattle, 98103
    This location may only have print documents available during open comment periods.

Contaminants 4

Contaminant Type
Soil
Groundwater
Surface Water
Air
Sediment
Bedrock
Halogenated Organics - Halogenated Organics C
Metals - Metals Priority Pollutants S
Non-Halogenated Organics - Petroleum Products-Unspecified C C
Non-Halogenated Organics - Polycyclic Aromatic Hydrocarbons C 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.