Bothell Landing
18120 18126 18132 Bothell Way NE 10001 Woodinville Dr, Bothell, WA 98011

Cleanup Excavation at the Bothell Landing Site
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On June 11, 2018, the Washington Department of Ecology and the City of Bothell have entered into an agreement called an Agreed Order, which requires the City to clean up the Bothell Landing site.

Previously, the City of Bothell completed a Remedial Investigation and Feasibility Study (RI/FS) on August 10, 2017. This study determined the nature and extent of remaining contamination and evaluated possible methods to clean up the site. They also prepared a Draft Cleanup Action Plan describing how they will clean up the site. A comment period was held to get public input on these documents, and Ecology responded to all comments. Interim action soil cleanups were conducted in September and October 2010, October 2013 to May 2014, September 2015, and January 2017. Following the excavations, confirmation samples were taken. Oxygen Release Compound (ORC) was placed in the 2010 excavation. The remedy for the Site is a combination of actions:

• excavation of contaminated soils (already completed as interim actions),
• engineering controls (capping under roadways, already completed),
• institutional controls (environmental covenants restricting access to soil and groundwater), and
• groundwater compliance monitoring to determine when cleanup standards have been met and if groundwater arsenic is natural background or induced by petroleum hydrocarbon degradation.

Remaining soil impacts are located under an active roadway (SR 522). Recently, two years of quarterly monitoring has been completed. Slight exceedances remain for dissolved heavy oil in groundwater, which was not a contaminant of concern in the CAP. Groundwater arsenic remains high in some wells, but might be local natural hot spots. Ecology and the City of Bothell will work together to evaluate next steps.

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The City of Bothell (Bothell) is the current owner of the property south of the intersection of SR 522 and SR 527, at 18120, 18132, and 18126 Bothell Way NE, Bothell (King County Tax Parcel Nos. 945720-0015) and 10001 Woodinville Dr. (King County Tax Parcel No. 945720-0020) as well as the adjacent right-of-way. Bothell acquired the right-of-way property in the late 1990’s and acquired the remaining Bothell Landing Property in 2007. They entered into an Agreed Order with Ecology in 2009 for investigation of contamination on the site.

A strip mall, restaurants, and historic gas stations with multiple abandoned petroleum underground storage tanks (USTs) formerly occupied the site. Initially, a portion of this site was acquired by Bothell for roadway widening and construction of a small park (Rotunda Park). In the course of redevelopment, five underground storage tanks and approximately 385 tons of petroleum contaminated soil were encountered and removed during construction of the park in 1998. Two gasoline service stations were formerly located on the north and northeast portions of the Bothell Landing site. One of the stations was likely associated with the five underground storage tanks.

The Bothell Landing Site was under the Voluntary Cleanup Program and Ecology issued an Interim No Further Action letter in 2002 for site soils (excluding ground water). The property owner recorded a restrictive covenant for the site in 2002 confirming that petroleum-affected soils and ground water exist at the site. Ecology removed the site from the Voluntary Cleanup Program in 2006 due to a lack of activity. Also in 2006, Ecology issued a Further Action Determination at the Site. The Further Action Determination stated that Ecology would review the No Further Action determination based on further ground water data showing compliance with the MTCA cleanup levels for petroleum hydrocarbons and aromatic hydrocarbons at the site (Riley Group, 2007).

An environmental investigation conducted at the Site in 2007 included soil and ground water samples at two locations. One location was at the vicinity of the former underground storage tank location near the north property boundary. The second location is at the central and southern portion of the Site, where historic fill activities are suspected. Chlorinated volatile organic compounds were detected in ground water samples. The source of these organic compounds is the nearby Ultra Custom Care Cleaners site, which is being cleaned up separately Interim action soil cleanups of petroleum hydrocarbons were conducted in 2010, 2013, 2014, 2015,and 2017. Chemicals of concern remaining after the interim action soil cleanups are:

  • In soil: Gasoline range petroleum hydrocarbons and benzene
  • In groundwater: Arsenic


Map showing site location as King County, WA SITE INFORMATION


View Electronic Documents

Cleanup Site Details Report

Facility Site ID: # 73975762

Cleanup Site ID: 3013

Bothell, King County

Status: Cleanup Started   Get definitions of Status terminology

Jerome Cruz
Site Manager
(425) 649-7094

Brad Petrovich
Project Planner and Public Involvement Coordinator
(425) 533-5537

Document Repositories:

Northwest Regional Office
15700 Dayton Ave N
Shoreline, 98133

King County Bothell Regional Library
18215 98th Ave NE
Bothell, 98011

Bothell City Hall
18415 101st Ave NE
Bothell, 98011