Boeing Kent Space Center
20403 68th Ave S, Kent, WA 98032

Boeing Kent Space Development Center sporting the 12th Man flag.
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CURRENT STATUS

Last Updated October 2019

Boeing is conducting a remedial investigation (RI) to determine the type, location and concentrations of contamination on this site.  We are overseeing Boeing’s work under a legal agreement (Agreed Order or Order). The investigation requires Boeing to sample soil, groundwater, indoor air and water and sediment in its stormwater management system. The findings of the investigation will be described in a revised remedial investigation (RI) report.

What's Next?

Boeing submitted a draft of the RI report to us in December 2017 and then additional information in 2018.  We reviewed the draft Report and additional information, and in November 2018 decided that more information was needed to understand where the different contaminants are found and their concentrations. In 2019 Boeing has been submitting detailed plans, proposing the sampling they are going to do get that information. Some of the sampling has been performed this year. More is scheduled later this year and early next year.  After Boeing completes the sampling in 2020 they will revise the RI Report and submit it for our review. We will then hold a public comment period so that the public has an opportunity to comment on the final RI Report.


SITE BACKGROUND

Boeing has conducted research and development at this facility, mostly for the U.S. Department of Defense.  Since the 1960’s Boeing has also conducted operations related to aerospace related operations. These activities include: electronic and electrical component manufacturing, metal milling, finishing and plating, photographic processing, and research and development in various laboratories. Chemicals used in those operations spilled and contaminated soil and groundwater. 

Boeing also previously stored hazardous waste at this site long term (under a federal Environmental Protection Agency Resource Conservation and Recovery Act, RCRA, interim status, 40 CFR Part 265.)  Now, Boeing can now only store hazardous waste for up to 90 days.

In 2016 Ecology issued the cleanup Order that requires Boeing to conduct an RI. We approved the RI work plan later that year. 


Remediated property ready for redevelopment.
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CONTAMINANTS OF CONCERN

Contaminants have been detected in groundwater, soils, soil gas, stormwater, and/or surface water sediments. They include:

• volatile organic compounds (VOCs) such as benzene and vinyl chloride
• petroleum hydrocarbons
• semi-volatile organic compounds ( “SVOCs”), including polycyclic aromatic hydrocarbons (or “PAHs”)
• PCBs 
• toxic metals

The levels of contamination found at many of the soil and groundwater sampling locations has been relatively low and less than the levels that pose a risk to human health (referred to as risk-based screening levels) or the environment.  At some locations one or more contaminant concentrations are higher than the RI’s risk-based screening levels.

At this time, we do not believe that people are currently being exposed to harmful levels of contamination. This is because groundwater at the site is not used for drinking water and Boeing controls public access to their property.  If we discover that people are coming in contact with harmful levels, we will direct Boeing to quickly take protective actions. We will have a more complete picture of the types, concentrations, and locations of the contaminants when the RI is finished.
 
At this time, we do not believe that people are exposed to harmful levels of contamination because Boeing controls public access and most of the contamination is covered.  If we discover that people are coming in contact with harmful levels, we will direct Boeing to quickly take protective actions. We will know more about the concentrations and locations of the contaminants when the RI is completed.


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CLEANUP

The purpose of the first step of the cleanup process, the RI, is to gather data. All parts of the process will be made available for public review and comment.

That data from the RI will be used to propose and evaluate cleanup alternatives (feasibility study or FS) and develop a cleanup action plan (CAP) if needed.


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INVESTIGATING SITE CONTAMINATION

Ri sampling results are contained in Boeing’s 2017 draft RI Report vol.1, 2017 draft RI Report vol. 2), RI Report Addendum, and RI Report Addendum 2   The locations that were investigated in 2017 and 2018 included:

• Former underground storage tanks (KS-2.5 and KS-26) in Building 18-43 (SWMU-88 and SWMU-89).
• Former underground storage tanks (KS-5 and KS-6), north side on Building 18-54 (AOC-1 and AOC-3).
• Former underground storage tank (KS-7), north side on Building 18-35 (AOC-2).
• Former milling machine area in Building 18-62.
• Former underground storage tank area adjacent to Building 18-67.
• Former underground storage tank location near Door W-3 west side of Building 18-42.
• Former leaking underground storage tank at Building 18-41.
• Stormwater management system (SWMU-86).

In 2019, Boeing:

(1) Prepared revised RI screening level tables, updated RI data tables, and associated figures
(2) Submitted the final Phase II report for the Space Center
(3) Submitted the results of sampling soils for PCBs near buildings 18-25 and 18-28
(4) Submitted a Groundwater Conceptual Model memorandum, as part of their 2019 RI Data Gaps Work Plan.  This memorandum was developed in response to Ecology’s November 2018 comment letter and our March 2019 Technical Memorandum (“Boeing Kent Space Center Hydrogeologic Characterization Data Gaps”)
(5) Submitted a Building 18-62 Vapor Intrusion Evaluation memorandum, as part of their 2019 RI Data Gaps Work Plan
(6) Submitted a SWMU 88/89 post-demolition Sampling Plan, as part of their 2019 RI Data Gaps Work Plan
(7) Proposed and implemented changes to their groundwater monitoring program
(8) Demolished several site buildings
(9) Began preparing for a sale of about half the present Space Center property.  The property being sold is in the northern and eastern portions of the facility.Following review of the two Boeing memoranda, their Sampling Plan, and their proposed changes to the monitoring program noted above, Ecology approved the respective documents.



 

Map showing site location as King County, WA SITE INFORMATION

Map

View Electronic Documents

Cleanup Site Details Report

Facility Site ID: # 2099

Cleanup Site ID: 12671

Location:
Kent, King County

Status: Awaiting Cleanup   Get definitions of Status terminology

Contacts:
Li Ma
Site Manager
(425) 649-7280

Janelle Anderson
Public Involvement Coordinator
(425) 649-7286


King County Library - Kent Library
212 2nd AVE N
Kent, 98032
(253)859-3330