Burlington Environmental LLC Georgetown
734 S Lucile St, Seattle, WA 98108

Contractors injecting an oxidant for ISCO pilot study.
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Last Updated 12/21/2016

East of 4th Site
A pilot project to address contamination in groundwater began on June 23, 2016. The project studied the ability of in-situ chemical oxidation (ISCO) to reduce 1,4-dioxane levels in site groundwater. ISCO is a remedy that adds chemicals to an area to destroy contamination.

Weekly groundwater monitoring began in late June and monitoring continued into August and September. 1,4-dioxane concentrations decreased in the study’s monitoring wells between June and September. However, the reductions were more modest and took longer to occur than expected.  Other monitoring results, and observations made during the two days of injection, suggest that the injected oxidant was not distributed as we expected.  The chemicals used in the pilot project may have also reacted with naturally-occurring metals and organic compounds more than anticipated.

Based on the study results, Ecology believes full-scale ISCO applications along 6th Avenue should not be designed and implemented as soon as we had originally planned. Instead, we should evaluate options to direct oxidant injection.  Accordingly, Stericycle will now conduct small-scale field studies to assess slow-release oxidant “candles,” and the injection of non-native dioxane-reducing microorganisms. A draft work plan proposing these studies was submitted on November 17 and on December 5 Ecology responded with a comment letter. The studies are currently planned to begin in early 2017.

For more information, check out our informational flier (PDF) or contact Ed Jones.

West of 4th Site
After receiving the revised FS Reports for Site Units 1 and 2, Ecology sent a letter to the PLPs describing our preferred alternatives for the site. These alternatives are different than the PLPs’ own preferences for site cleanup actions. Our preferred alternatives also include additional remedial components.
On November 21, Ecology received a letter from the West of 4th PLPs describing a proposed path forward for the site. This path would begin pilot studies to determine if remedies will be effective. The pilot studies would begin before a draft Cleanup Action Plan was drafted and before selecting a final remedy. Ecology have agreed with their proposal.
The PLPs will now prepare three draft work plans by March 31, 2017. These work plans will include:

  • Objectives of the new studies.
  • Specific proposals for how the studies will be carried out and monitored.
  • Timeframes for the pilot studies.
After Ecology reviews the work plans, we will hold a 30-day public comment period for the work plans and a draft amendment of the West of 4th Agreed Order. An amendment of the Order would be needed to update due dates for future documents and activities. 
Ecology will decide whether or not to approve the work plans and the Agreed Order amendment after hearing from the public.


The facility and site have been called “PSC Georgetown” in the past. We use PSC Georgetown here to be consistent with past notices and to avoid confusion.

In 1991, Ecology and the U.S. Environmental Protection Agency (EPA) jointly issued a permit to Burlington Environmental to treat and store hazardous and dangerous waste at the 734 South Lucile Street property. The permit also included Resource Conservation and Recovery Act (RCRA) corrective action requirements and a schedule for completing them. The permit’s corrective action section was modified in 2001 to update its requirements and schedule.

The PSC Georgetown facility closed as a hazardous and dangerous waste treatment and storage facility in 2003 and the property is not currently being used commercially. However, releases from past operations at the facility have contaminated soils and groundwater. These releases were from spills and from leaking underground storage tanks containing solvent and petroleum wastes.

Washington State’s Dangerous Waste Regulations require a facility that treats, stores, or disposes of dangerous wastes (TSD) to have a permit until all activities, including corrective actions and final closure, are completed. The current permit incorporates two Agreed Orders. The 2010 Agreed Order is for the eastern part of the site and the 2014 Agreed Order is for the western part of the site. The 2014 Agreed Order includes three other companies. Releases from all four companies have contributed to groundwater contamination in the “West of 4th” area.


Soils are contaminated on the PSC property and on property to the east and north owned by the Union Pacific Railroad company. Groundwater contamination has been detected below the facility property and down-gradient to the west and southwest, toward the Duwamish Waterway. It is also present on the Union Pacific Railroad property. Because of this soil and groundwater contamination, cleanup requirements continue to be needed in the company’s permit.

Groundwater under the property, east of the property, north of the property, and southwest toward the Duwamish Waterway are contaminated with:

  • Volatile organic compounds (like trichloroethene, vinyl chloride, and petroleum hydrocarbons).
  • Semi-volatile compounds (like 1,4-dioxane).
  • Toxic inorganics (like certain metals).

Soils at the property and in areas east and west of the property are contaminated with:

  • Volatile organic compounds (like trichloroethene and petroleum hydrocarbons).
  • Semi-volatile compounds.
  • PCBs.
  • Toxic inorganics.

Groundwater contamination from the PSC-Georgetown facility has migrated west. Three companies have also released chlorinated solvents in this western area: 

Art Brass Plating (5516 3rd Ave. S.)
Blaser Die Casting (5700 3rd Ave. S.)
Capital Industries (5801 3rd Ave. S.)

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East of 4th

The 2010 PSC Georgetown Agreed Order and Cleanup Action Plan (CAP) describe the cleanup actions the company must implement in the part of its site located east of 4th Ave. Several of these actions have been completed. Cleanup activities have included:

  • 2004: A below-ground barrier wall was constructed. The wall surrounds the facility property and prevents further migration of contaminated groundwater to the west and southwest.
  • 2012: Soils containing PCBs (poly-chlorinated biphenyls) and other hazardous substances were excavated from the Union Pacific property east of the PSC facility. These soils were disposed of in a permitted hazardous waste landfill.
  • 2012-2014: The company operated a Soil Vapor Extraction system to reduce levels of volatile contaminants on its property, as well as the Union Pacific property.
  • 2015: An amendment to the Agreed Order proposes in-situ chemical oxidation to lower 1,4-dioxane levels. The amendment also proposes to follow in-situ chemical oxidation with bioremediation.

West of 4th

Burlington-Environmental, Art Brass Plating, Blaser Die Casting, and Capital Industries have completed remedial investigations in the area west of 4th Ave. S. They are presently conducting a feasibility study. During this period, Art Brass Plating will continue to operate a groundwater air sparging and soil vapor extraction interim action remediation system.  The West of 4th Feasibility Study Report, due to be completed and approved in 2016, will evaluate various cleanup alternatives and conclude with the selection of a “preferred” remedy for the soil and groundwater contamination in this area. 


[1] The former PSC Georgetown facility is a secured property no longer used for commercial purposes. PSC uses the adjacent former White Satin Sugar facility for non-RCRA regulated activities and equipment storage.



Map showing site location as King County, WA SITE INFORMATION


View Electronic Documents

Site Summary Report

Facility Site ID: # 47779679

Cleanup Site ID: 2622

Seattle, King County

Status: Cleanup Started   Get definitions of Status terminology

Ed Jones
Site Manager

Bridgette Valdez-Kogle
Public Involvement Coordinator

Document Repositories:

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

South Park Branch / Seattle Public Library
8604 Eighth Avenue South
Seattle, 98108