Bothell Former Hertz
18030 Bothell Way NE, Bothell, WA 98011


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 Former Hertz Site. 

The City of Bothell completed a Remedial Investigation and Feasibility Study (RI/FS). 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.

The Agreed Order has been signed and is now in effect. The Final Cleanup Action Plan (FCAP) is now available. The selected remedy in the FCAP is a combination of:

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The Bothell Former Hertz Site (also known as Aarenco, or AA Rentals of Bothell) is generally located on both sides of the newly constructed SR 522 roadway, between Bothell Way NE and 98th Avenue NE / NE 180th Street, in Bothell, Washington. The City of Bothell purchased the property in 2009. They entered into an Agreed Order with Ecology in 2011 for investigation of contamination on the site.

The property had been developed from 1918 until 2010, when the City of Bothell demolished buildings on the Site for its SR 522 Bothell Crossroads realignment project.
Past property use included automobile repair and dealerships, fueling, and equipment rental. Before the property was purchased by the City of Bothell in 2009, it contained a Hertz equipment rental office, storage yard, and equipment repair shop.

The property contained a building used as an automobile dealership. A petroleum company is listed as a lessee in 1930. The building included a gasoline dispensing facility with Underground Storage Tanks (USTs). Three USTs were removed from the property in 1993. Petroleum-affected soils were encountered during the UST removals, and an unknown quantity of affected soils remained at the property underneath buildings. 

In 2008, the City of Bothell conducted Phase I and Phase II Environmental Site Assessments (ESAs) at the Site prior to its purchase of this and adjoining properties. The 2008 Phase II ESA included soil and ground water sampling where three former USTs had been removed in 1993. Petroleum hydrocarbons were detected in soil and ground water exceeding state cleanup standards. Vinyl chloride and volatile organic compounds (VOC) were detected at concentrations exceeding state cleanup standards in ground water samples. 

Other VOCs were detected in groundwater at the time, including common solvents - tetrachloroethene and trichloroethene. The concentrations were below state cleanup standards. The VOC detections in groundwater appear to be from Bothell Service Center Simon & Son Cleanup site, which is being cleaned up separately. Arsenic was also detected in one well above cleanup levels.

In summer 2010, Bothell completed an independent cleanup action at the Site to remove approximately 12,000 tons of soils contaminated with mostly oil petroleum hydrocarbons from former underground storage tanks. Some limited remedial investigation was also conducted at that time. Interim action soil cleanups were conducted in 2012 and 2013.

Chemicals of concern remaining in groundwater after the interim action cleanups are:

  • Total petroleum hydrocarbons (gasoline, diesel and motor oil range)
  • Arsenic
  • Halogenated volatile organic compounds (HVOCs), from the adjacent Bothell Service Center Simon & Son dry cleaning site, which is a separate state cleanup site.


Map showing site location as King County, WA SITE INFORMATION


View Electronic Documents

Cleanup Site Details Report

Facility Site ID: # 11687976

Cleanup Site ID: 7906

Bothell, King County

Status: Cleanup Started   Get definitions of Status terminology

Jerome Cruz
Site Manager
(425) 649-7094

Document Repositories:

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

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

Bothell City Hall
18415 101st Ave NE
Bothell, 98011