Gas Works Park WA Natural Gas
2000 N Northlake Way, Seattle, WA 98103

Gas Works Park in Seattle
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The Department of Ecology (Ecology) is currently working with City of Seattle (City) and Puget Sound Energy (PSE) to develop an environmental report (called a Remedial Investigation/Feasibility Study Report) that describes contamination at the Gas Works Park Cleanup Site, and present options for addressing it. This report is scheduled to be finished in early 2020.

In the fall of 2017, Ecology conducted a public comment period on draft plans for interim cleanup work at Gas Works Park in Seattle. Comments received did not warrant changes in the plans and so were made final. PSE and the City then began operating a system to monitor and remove arsenic contamination that resulted from past manufactured gas processes. The system was installed in the spring of 2017.  The plans describing that work and system include:


Gas Works Park is a 20-acre park located at 2101 North Northlake Way.  The park extends into Lake Union, which lies to the east, west and south of the park.  The park’s north end is bounded by Seattle's Wallingford neighborhood. From the early 1900s until 1956, gas companies operated a plant at the site that converted coal and oil into manufactured gas.  A tar refinery also operated at the site, refining materials obtained as a by-product of the gas manufacturing process, and producing coal tar-based products.  
Several cleanup efforts have been conducted in areas of the park (see below) since 2000. Sediment investigations offshore of Gas Works Park in Lake Union have indicated the presence of high levels of polycyclic aromatic hydrocarbons (PAHs).  The City of Seattle and Puget Sound Energy are conducting investigations for these contaminated sediments.

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Ecology oversees work at Gas Works Park to ensure previous cleanups continue to protect human health and the environment and are consistent with the existing legal agreements between Ecology, Parks and PSE. 

The park uplands underwent environmental cleanup actions in 2000/2001, 2005 and 2012. A cap of up to two (2) feet of clean topsoil and a geotextile fabric as an indicator were placed over the contaminated soil below. Between 2001 and 2006, soil and groundwater were cleaned up in the SE corner of the park. The work completed last year will maintain the integrity of the cap on Kite Hill. The work is being done before the in-water cleanup of contaminated sediment which is expected to begin in late 2018.

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The Environmental Protection Agency (EPA) has developed a new environmental justice (EJ) mapping and screening tool called EJSCREEN. It is based on nationally consistent data and an approach that combines environmental and demographic indicators in maps and reports. See below for information about demographics in the area of Gas Works Park, Seattle.

EJSCREEN Census Block Map - This shows the Census Blocks used to generate the reports below.

EJSCREEN ACS Summary Report Gas Works Park – This shows the demographic information about the population of the area.

EJScreen Report Gas Works Park – This report shows the values for environmental and demographic indicators and EJSCREEN indexes. These percentiles provide perspective on how the selected block group or buffer area compares to the entire state, EPA region, or nation. You can also check What’s in My Neighborhood to find out about other cleanups in your area. 


Map showing site location as King County, WA SITE INFORMATION


View Electronic Documents

Cleanup Site Details Report

Facility Site ID: # 139

Cleanup Site ID: 2876

Seattle, King County

Status: Cleanup Started   Get definitions of Status terminology

Lucy McInerney
Site Manager
(425) 649-7272

Brad Petrovich
Project Planner and Public Involvement Coordinator
(425) 649-4486

Document Repositories:

Northwest Regional Office
3190 160th Ave SE
Bellevue, 98008-5452

Fremont Public Library
731 N 35th Street
Seattle, 98103