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

2017 in-situ pilot study locations
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Last Updated 4/252016

East of 4th Site
Starting in May, contractors working for Stericycle will study methods designed to enhance the destruction of 1,4 dioxane found in groundwater under Georgetown. The studies will test two in-situ (belowground) cleanup methods, in-situ bioremediation and in-situ chemical oxidation.

In-situ bioremediation study
This two-phase study tests the use of non-native microorganisms that can destroy 1,4-dioxane. During phase 1, Stericycle contractors will place microorganisms into existing groundwater monitoring wells along 6th Avenue South.  This is commonly referred to as “bioaugmentation.” They will monitor the groundwater about a week later and continue every three months for six months. If Phase 1 is successful, the same type of microorganisms will be injected into groundwater just east of the 6th Avenue South and South Findlay Street intersection.

In-Situ Chemical Oxidation Pilot Study
This project tests wax candles that slowly release two oxidants, persulfate and permanganate, into groundwater. These two oxidizing chemicals can destroy 1,4-dioxane. The candles will release the oxidants into three new wells 50-60 feet below the ground. Groundwater monitoring will begin about a month later and continue every three months for a year. The new wells will be located near the intersection of Maynard Avenue South and South Lucile Street.  A similar study using liquid oxidants was performed nearby in 2016.
Contact Ed Jones, Ecology’s site manager, with questions about these studies or other aspects of the cleanup.

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West of 4th Site
After receiving and reviewing the revised FS Reports for West of 4th 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 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 evaluate certain cleanup technologies and determine their likely effectiveness at the site. The pilot studies would begin before a draft Cleanup Action Plan was drafted and before selecting a final remedy. Ecology has agreed with the proposal, contingent on public acceptance.
The PLPs will now prepare three pilot study work plans. Each work plan is specific to an area of site contamination and particular cleanup technology. 
Site unit 1
Two studies will be performed -- one in an area where elevated levels of nickel and other metals are present in groundwater, and the other in an area near the Duwamish Waterway where groundwater is contaminated with trichloroethene (TCE) and vinyl chloride. 
Site unit 2
This will also focus on an area where groundwater is contaminated with TCE and vinyl chloride, but father east, at 1st Avenue South.
As noted above, a cleanup technology will be studied at each of the three site areas to evaluate its effectiveness. We will also gather information to help design a full-scale version of the technology, should it later be selected as part of the site’s final cleanup action. Each work plan will include:

  • Objectives for each of the new studies.
  • Proposals for how the studies will be carried out and monitored.
  • Timeframes for the studies.
The first draft work plan was submitted on March 31, 2017.  Ecology anticipates the other workplans in mid to late April. After we review 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 is needed to update due dates for future documents and activities. 
After the comment period has closed and we have considered the input we have received, Ecology will decide whether or not to approve the work plans and issue the Agreed Order amendment.


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