Facility Site ID: 2056 Cleanup Site ID: 4532

Current Status

Updated May 2022

Formal cleanup in investigation phase

Phase 1 of sampling for the remedial investigation concluded in April 2022.  Soil and groundwater samples were collected throughout the property.  It will take few months to get the samples analyzed and the data checked for quality assurance.  Then Ecology will review the results and decide where additional data are needed for the remedial investigation report.


Why this cleanup matters 

This site is part of Ecology’s Lower Duwamish Waterway source control efforts, because it may be contributing pollution the Lower Duwamish Waterway (LDW) Superfund Site. The 5-mile stretch of the Duwamish River that flows north into Elliot Bay was added to the Superfund National Priorities List by the U.S. Environmental Protection Agency (EPA) in 2001.

The sediments (mud) in the river contain a wide range of contaminants due to decades of industrial activity and runoff from urban areas. EPA is leading efforts to clean up the river
sediments.

Ecology is leading efforts to control sources of contamination from the surrounding land area. The long-term goal is to minimize recontamination of the river sediment and restore water quality in the river. 

The Precision Engineering Inc. Site is one of several sites that will be cleaned up as part of Ecology’s Source Control Strategy – controlling sources of pollution to the river. Contaminants in the soil and groundwater around the river pose a risk to human health and the environment. They can also find their way into the river through storm runoff and other pathways. For more information, visit our Source Control page.

Site Information

Site Location

The Site is associated with the property (Property) at 1231 S Director Street, Seattle, in unincorporated King County near the municipal boundary between the cities of Seattle and Tukwila. The property is shown on the figure above.  Adjacent properties are developed with residences to the north and northwest and a highway US-99/West Marginal Way cloverleaf interchange to the south. 




Site History


Precision Engineering operated at the Property from 1968 through 2005.  Activities included
grinding and polishing, honing, hard-chrome plating, milling, welding, and other flame and arc-applied metal coatings. Precision Engineering’s work involved the use of a number of chemicals, particularly chromic acid for plating and trichloroethene (TCE) as a solvent. A number of chromic acid plating tanks were located in the former chrome shop, as were tanks containing hydrochloric acid, sodium carbonate, and sodium hydroxide. 


 Contamination
 

Initial contaminants of concern identified for this Site include:

•oil and diesel range organics (ORO, DRO)

•trichloroethylene (TCE)

•chromium (Cr III, Cr VI)  


Previous Investigation and Cleanup Work

Remedial action begin in 1990. Initially, a limited amount of highly-contaminated soil was removed from beneath the facility floor and disposed of off-Property. In 1992 four tanks were removed from the Site and additional contaminated concrete and soil was excavated and removed.  Soil samples from the excavation sidewalls indicated that mobile chromium (hexavalent chromium) concentrations remained elevated.  Multiple investigations of the nature and extent of contamination were then completed at the Site, with one additional excavation in 2007 and 2008.  This action involved the removal of 100 cubic yards of metals-contaminated soil from the drainage ditch at the south edge of the Property. Most recently in 2020, actions were taken within the building at the Property to reduce TCE levels in indoor air. These actions included sealing an open sump and cracks in the concrete floor.

General Cleanup Process

Legal 6
Public Information 4
Document Title Document Date Document Type
Response to Comments Precision Engineering Inc. AO PPP 1/12/2021 Responsiveness Summary
Precision Engineering Inc. Factsheet: English 11/6/2020 Fact Sheet\Public Notices
Precision Engineering Inc. Factsheet: Spanish 11/3/2020 Fact Sheet\Public Notices
Precision Engineering Inc. Public Participation Plan - November 2020 11/3/2020 Public Participation Plan
Technical Reports 22
Document Title Document Date Document Type
Precision Engineering Remedial Investigation Work Plan Text 3/31/2022 Remedial Investigation Work Plan
Precision Engineering Remedial Investigation Work Plan Tables and Figures 3/31/2022 Remedial Investigation Work Plan
Precision Engineering Remedial Investigation Work Plan Appendices E-L 3/31/2022 Remedial Investigation Work Plan
Precision Engineering Remedial Investigation Work Plan Appendices A-D 3/31/2022 Remedial Investigation Work Plan
Precision Engineering - Ecology Project Coord Change Letter 3/22/2021 Site Specific Administrative Document - other (Administrative correspondence)
Vapor Instrusion Assessment, Interim Remedial Actions, Vapor Intrusion Priority Work Plan, Precision Engineering 12/30/2020 Site Specific Technical Document - other
Vapor Intrusion Assessment Work Plan Precision Engineering, Inc., Seattle, Washington 12/20/2019 Scope Of Work
Request for Evaluation of Trichloroethene Risk at the Following Site: Precision Engineering, Inc., Seattle 10/18/2019 Site Specific Administrative Document - other (Administrative correspondence)
Precision Engineering Remedial Investigation 2015 8/6/2015 Remedial Investigation Report
Precision Engineering Vapor Sampling Report 2/25/2015 Site Specific Technical Document - other
Precisoin Engineering GW Monitoring Report December 2014 2/15/2015 Groundwater Monitoring Report
Precision Engineering GW Monitoring Report September 2014 10/21/2014 Groundwater Monitoring Report
Precision Engineering RI/FS Work Plan 3/25/2014 Remedial Investigation Work Plan
Precision Engineering Summary and Data Gaps Assessment 12/18/2013 Site Specific Technical Document - other
Supplemental Information Requested by Ecology for Former Precision Engineering 3/9/2011 Site Specific Technical Document - other
Precision Engineering Inc, Final Feasiblity Study 3/3/2011 Feasibility Study
Precision Engineering Inc. - Vapor Instrusion Mitigation System Installation and Long Term Monitoring Work Plan 10/1/2008 Site Specific Technical Document - other
Precision Engineering Inc - Final Remedial Investigation and Risk Assessment Report 7/21/2008 Remedial Investigation Report
Precision Engineering Inc - Vapor Intrusion Mitigation System Installation & Long Term Monitoring Work Plan 7/1/2008 Site Specific Technical Document - other
Groundwater Cleanup Levels for Protection of Surface Water and Groundwater Fate and Transport Modeling for the Former Precision Engineering Site 2/25/2008 Site Specific Technical Document - other
Precision Engineering Inc - Work Plan for soil and groundwater supplemental remedial investigation 11/23/2005 Remedial Investigation Work Plan
Precision Engineering Inc - Preliminary Soil and Groundwater Site Assessment Report 8/5/2005 Site Specific Technical Document - other
Voluntary Cleanup Program 3
Document Title Document Date Document Type
Precision Engineering Opinion - Further Action Required 12/2/2015 Voluntary Cleanup Program Opinion – Other
Precision Engineering - VCP Opinion on Proposed Remedial Action 7/8/2011 Voluntary Cleanup Program Opinion – Other
Precision Engineering - Opinion Letter (September 2009) 9/21/2009 Voluntary Cleanup Program Opinion – 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.

Contaminants 5

Contaminant Type
Soil
Groundwater
Surface Water
Air
Sediment
Bedrock
Metals - Metals - Other C C B
Non-Halogenated Organics - Polycyclic Aromatic Hydrocarbons C C B
Halogenated Organics - Halogenated Solvents C C B C
Non-Halogenated Organics - Petroleum-Diesel C C B
Non-Halogenated Organics - Petroleum-Gasoline C C B B
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.