Bothell Riverside TPH
NE 180th St & Woodinville Dr Sr 522, Bothell, WA 98011

Bothell Riverside Sites & Vicinity
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SITE STATUS - OCTOBER 2019


Ecology has negotiated two new legal agreements called Agreed Orders with the City of Bothell (City), the Potentially Liable Person (PLP) for the Bothell Riverside TPH and Bothell Riverside HVOC Sites. These orders will replace an existing 2009 Agreed Order for the original Bothell Riverside Site.

Ecology is now hosting a public comment period for these orders and a public participation plan. We’d like your input on:


• Agreed Order – Riverside TPH Site: states that contamination was removed through interim cleanup actions in 2010 and 2017, and is in compliance with safe cleanup levels required under Washington’s cleanup law, the Model Toxic Control Act (MTCA). Ecology will remove this Site from its Hazardous Sites List (HSL).
• SEPA (State Environmental Policy Act) Checklist & DNS (Determination of Non-Significance): states that the Cleanup Action Plan for the Riverside TPH Site will not cause environmental damage.
• Agreed Order – Riverside HVOC Site: requires the City to complete a Supplemental Remedial Investigation, Feasibility Study, Interim Action, and draft Cleanup Action Plan for the Site.
• Public Participation Plan: updates a 2017 Plan that describes how Ecology will inform the community about Site activities and opportunities to be involved in the cleanup process.

Ecology will be accepting comment on these documents from October 28 - November 26, 2019. You can view the documents by following the links above, and you can comment on them by emailing the contacts to the right of this page, or by using Ecology's e-comment system.


Bothell Riverside TPH & HVOC Sites
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SITE BACKGROUND

The Bothell Riverside TPH (Total Petroleum Hydrocarbons) and HVOC (Halogenated Volatile Organic Compounds) Sites are generally located at NE 180th Street & Woodinville Drive (SR 522) in Bothell. Originally, these were considered “areas” within the overall Riverside Site. In 2009, Ecology and the City entered into an Agreed Order to conduct investigations, develop cleanup alternatives, and perform interim cleanup actions in both areas.A former gasoline service station once operated at the Riverside Site. Investigations found petroleum contaminants in soil in the TPH area and chlorinated solvents in groundwater in the HVOC area.


Riverside TPH Site
Operations at the former gasoline service station caused petroleum contamination to get into the soil in the TPH area at cleanup levels higher than allowed under the Model Toxics Control Act (MTCA). In 2010, and again in 2017, the City conducted interim cleanup actions to partially address the contamination. The City excavated the petroleum-contaminated soil and disposed of it at a licensed off-site facility. These actions were successful in removing all contamination from the TPH area. No additional cleanup work is required there.

The new TPH Agreed Order now designates this former area as the Riverside TPH Site. It can now be removed from the Hazardous Sites List while separate work continues in the Riverside HVOC Site, which Ecology will do following public comment.

Riverside HVOC Site
Operations at the former gasoline service station are believed to have caused HVOC (chlorinated solvents, essentially from dry cleaning fluids and its breakdown products) to enter groundwater in the HVOC area at cleanup levels higher than allowed under MTCA.

In 2013, Ecology and the City agreed to amend the 2009 Agreed Order so that the City could conduct an interim cleanup action to prevent the chlorinated solvents from discharging into the Sammamish River. The City installed six extraction wells to collect solvent-contaminated groundwater and treat and discharge it into the sanitary sewer.

The new HVOC Agreed Order now designates this former area as the Riverside HVOC Site, allowing cleanup work to continue while the TPH Site is removed from the Hazardous Sites List. Under this order the City will complete a Supplemental Remedial Investigation, Feasibility Study, Interim Action, and preliminary draft Cleanup Action Plan for the Site. The City will also continue to implement the 2013 Interim Action.


 

Map showing site location as King County, WA SITE INFORMATION

Map

View Electronic Documents

Cleanup Site Details Report

Facility Site ID: # 53578168

Cleanup Site ID: 6240

Location:
Bothell, King County

Status: Cleanup Started   Get definitions of Status terminology

Contacts:
Sunny Becker
Site Manager
(425) 649-7187

Jerome Cruz
Project Lead
425-649-7094

Brad Petrovich
Public Involvement Coordinator
(425) 649-4486


Document Repositories:

Northwest Regional Office
3190 160th Ave SE
Bellevue, 98008-5452
(425)649-7190

King County Bothell Regional Library
18215 98th Ave NE
Bothell, 98011
(425)486-7811

Bothell City Hall
18415 101st Ave NE
Bothell, 98011
(425)806-6100