Current Status - July 2021
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.
Site Background
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
Site use restrictions called institutional controls are in effect
Institutional controls can be fences, signs, or restrictions on how the property is used. For instance, an institutional control may prohibit installing drinking water wells or disturbing a protective cap that isolates contamination. These restrictions keep the contamination contained and keep people from being exposed to the contamination. The controls are usually listed in environmental covenants recorded with the county.
Periodic reviews are required when institutional controls are required at a site. Ecology conducts reviews to make sure the controls remain effective and the cleanup still protects human health and the environment. We conduct periodic reviews about every five years.
Institutional Controls 2
Environmental Covenant
Covenant Restrictions
- Any activity that results in release or exposure or creates a new exposure pathway
- Prohibit New Building Construction
- Prohibit Removal or Alteration of Existing Buildings
- Restrict Land Use
Media Restrictions
- Groundwater
- Soil
Other Upland Instrument
Covenant Restrictions
- Maintain/Protect Monitoring System
- Ongoing Maintenance of Remedy
- Prohibit Soil Disturbance
- Restrict All Ground Water Extraction/Well Installation
- Restrict Domestic Ground Water Extraction/Well Installation
Media Restrictions
- Groundwater
- Soil
Documents 57
Legal 9
Document Title | Document Date | Document Type |
Memorandum of Agreement between the Washington State Department of Ecology (Ecology) and the City of Bothell (City) regarding City Streets and Right-of-ways at MTCA Sites | 7/9/2021 | Interlocal/Interagency Agreement; Memorandum of Agreement or Understanding |
Final Agreed Order No. DE 15746 Bothell Landing (Cleanup) | 6/11/2018 | Agreed Order |
Bothell Landing Cleanup Agreed Order 2018 (Public Review Draft) | 4/5/2018 | Agreed Order |
Satisfaction of Agreed Order No. DE 6294 for the Bothell Landing Facility | 1/31/2018 | Order Notice of Satisfaction/Status |
Bothell Landing Final AO amendment | 6/10/2010 | Agreed Order Amendment |
Agreed Order Amendment 1- Bothell Landing | 6/9/2010 | Agreed Order Amendment |
Bothell Landing- Final Agreed Order | 3/27/2009 | Agreed Order |
Bothell Landing Agreed Order DE6294 | 2/3/2009 | Agreed Order |
Environmental Covenant Bothell Landing 2002 | 1/4/2002 | Environmental Covenant; Alternative Mechanism |
Leaking Underground Storage Tank 1
Document Title | Document Date | Document Type |
Bothell Landing (Triangle Park) - LUST Site Assessment | 6/10/2014 | LUST - Site Assessment Report |
Public Information 7
Document Title | Document Date | Document Type |
Bothell Landing 2018 Agreed Order and SEPA Fact Sheet | 4/2/2018 | Fact Sheet\Public Notices |
Bothell Landing Updated Public Participation Plan | 4/2/2018 | Public Participation Plan |
City of bothell Fact Sheet Public comment period for Interim Remedial Actions at three Sites in Downtown Bothell | 5/1/2010 | Fact Sheet\Public Notices |
Bothell Landing Fact Sheet Public Comment Period for IRA | 5/1/2010 | Fact Sheet\Public Notices |
Bothell Landing Fact Sheet | 12/31/2008 | Fact Sheet\Public Notices |
Bothell City of Bothell Agreed Orders Fact Sheet Three Agreed Orders with the City of Bothell Available for Comment | 12/1/2008 | Fact Sheet\Public Notices |
Bothell Landing PPP | 12/1/2008 | Public Participation Plan |
State Environmental Policy Act 4
Document Title | Document Date | Document Type |
State Environmental Policy Act Determination of Nonsignificance Bothell Landing | 3/15/2018 | SEPA Documents |
SEPA Environmental Checklist Bothell Landing Site | 10/12/2017 | SEPA Documents |
Bothell Landing/Riverside/Paint and Decorating SEPA DNS | 4/14/2010 | SEPA Documents |
Bothell Landing/Riverside/Paint and Decorating SEPA Checklist | 1/31/2010 | SEPA Documents |
Technical Reports 36
Places to see print documents
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Northwest Regional Office15700 Dayton Ave NShoreline, 98133Please schedule an appointment to view print documents at this location.
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King County Bothell Regional Library18215 98th Ave NEBothell, 98011This location may only have print documents available during open comment periods.
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Bothell City Hall18415 101st Ave NEBothell, 98011This location may only have print documents available during open comment periods.
Contaminants 7
Contaminant Type | Soil |
Groundwater |
Surface Water |
Air |
Sediment |
Bedrock |
---|---|---|---|---|---|---|
Halogenated Organics - Halogenated Organics | C | |||||
Metals - Metals Priority Pollutants | C | |||||
Non-Halogenated Organics - Petroleum Products-Unspecified | C | C | ||||
Non-Halogenated Organics - Polycyclic Aromatic Hydrocarbons | S | |||||
Halogenated Organics - Halogenated Solvents | C | |||||
Metals - Arsenic | C | |||||
Non-Halogenated Organics - Petroleum-Other | RA |
- S
- Suspected
- C
- Confirmed Above Cleanup Levels
- B
- Below Cleanup Levels
- RA
- Remediated-Above
- RB
- Remediated-Below
- R
- Remediated