Industrial Warehouse
2450 6th Ave S, Seattle, WA 98134


Ecology invites you to review and comment on the periodic review for the Industrial Warehouse Site located at 2450 6th Avenue South in Seattle, Washington.


A periodic review is conducted every five years following a cleanup action when institutional controls are used as part of the remedy, as required by the Model Toxics Control Act (MTCA). The purpose of the periodic review is to evaluate current site conditions and to ensure continued protection of human health and the environment.

Ecology will review comments received during the comment period and make recommendations for suggested changes. The periodic review will become final if no significant changes are made. An additional public comment period will be held if significant changes are made.

Please submit comments through Ecology’s Online Comment Form or mail your written comments to Tamara Welty at 3190 160th Ave S.E., Bellevue, WA 98008. To request ADA accommodation, call Ecology at 360-407-6831, 711 (relay service), or 877-833-6341 (TTY). More about our accessibility services.

Industrial Warehouse
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The Industrial Warehouse Site is located at 2450 6th Avenue South in Seattle, Washington. The Site is defined by heating oil releases from heating oil underground storage tanks (USTs) to soil and groundwater.


The Site is located in the lower Duwamish industrial area, south of downtown Seattle. The area is completely developed, and dominated by commercial and industrial businesses.  The current buildings on the property were constructed between 1951 and 1961, and have been used as warehouses by different businesses for general storage and retail stores.


A free product recovery program was initiated in March 2003 and continued through November 2003. Approximately 300 gallons of free product was removed from the recovery well.


Three USTs were decommissioned in-place in March 2003, and removed in March and April of 2004. Considering the structural integrity of the warehouse building, excavation was limited in extent and contaminated soils were left in the vicinity of the USTs.

The excavation was backfilled with pea gravel to a depth of 4 feet below ground surface. The remainder of the excavation was backfilled with control density fill (CDF). A new concrete slab was later poured over the excavation.


Post-remediation groundwater monitoring was conducted, and results indicated that the plume is likely to be contained within the property.  


Following remedial activities, Ecology issued a No Further Action (NFA) determination letter on May 31, 2006 through the Voluntary Cleanup Program (VCP). The NFA determination is contingent upon an environmental covenant, which was filed on the property on August 26, 2004. 


Map showing site location as King County, WA SITE INFORMATION


View Electronic Documents

Site Summary Report

Facility Site ID: # 1252928

Cleanup Site ID: 3929

Seattle, King County

Status: No Further Action   Get definitions of Status terminology

Comment Period:
SEPTEMBER 28, 2018 - OCTOBER 29, 2018

Sunny Becker
Site Manager
(425) 649-7187

Tamara Welty
Periodic Review Coordinator
(425) 649-7023

Nancy Lui
Public Involvement Coordinator
(425) 649-7117

Document Repositories:

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