Kens Auto Wash II
1013 E University Wy, Ellensburg, WA 98926


Ecology is providing an opportunity for the public to comment on the Proposed Removal from the Hazardous Sites List for the Kens Auto Wash II site, located at 1013 East University Way in Ellensburg.

Ecology is asking for your comments on the Proposed Removal from the Hazardous Sites List.

You are invited to:

    •   Review the "Kens Auto Wash II No Further Action" letter dated April 9, 2020

    •   Send you comments to Ecology for consideration. Comments will be accepted July 28, 2020 through August 27, 2020

The documents are available for review above and at the "View Electronic Documents" link in the right navigation pain.  Due to unforeseen circumstances, our standard physical repository locations are all closed; documents are currently available electronically only.  Please submit any comments and technical questions in writing to John Mefford, Site Manager, at 1250 West Alder Street, Union Gap, WA 98903, by email:, or online at:

To request an ADA accommodation, contact Ecology at (509) 575-2490 or visit  For Relay Service or TTY call 711 or (877) 833-6341.                 

Kens Auto Wash II - Courtesy of Bing Maps
Please click on the photo for a larger view


The site was built in 1988 is currently operating as a service station and carwash and was historically used as a gasoline station.

In 1996, a leak was detected after a tightness test was conducted on a gasoline fuel line to an underground storage tank (UST).  Initial investigations showed that gasoline had leaked to the soil and groundwater.

Kens Auto Wash II - Courtesy of Google Maps
Please click on the photo for a larger view


To determine the extent and degree of contamination at the site, a consultant was hired to monitor groundwater and characterize the soil.  In late 2000, remedial excavation activities were conducted at the site in an effort to remove petroleum contaminated soil.  A large volume of soil was excavated; however, residual contaminated soil contains high levels of petroleum hydrocarbons, which continues to contaminate groundwater on and offsite. Free petroleum product was detected in one groundwater monitoring well onsite.

In 2003, Ecology and the former site owner entered into an Agreed Order to conduct a Remedial Investigation/Feasibility Study (RI/FS) to compile previously collected sampling data and evaluate site cleanup alternatives.  In 2005, an Interim Action was conducted to decommission the USTs and to remove contaminated soil. In November 2006, the RI/FS was completed.  In 2011, remedial injections, usually an oxygen compound, were performed to address the remaining soil contamination.

In June 2013, a Supplemental Feasibility Study was completed.  In 2013, a new Agreed Order was entered into to implement an Interim Action that calls for the addition of bioremediation compounds to reduce groundwater contaminant concentrations.  Also in 2013, a Supplemental Feasibility Study was conducted and the RI/FS Agreed Order was closed.

In 2015, additional remedial injections were performed under the Interim Action.  Compliance monitoring showed that groundwater was no longer impacted and any remaining petroleum contamination is below state cleanup standards. 

In 2019, soil contamination and the Vapor Intrusion pathway was evaluated. Vapor Intrusion can sometimes happen when chemicals, such as gasoline and diesel, are leaked or spilled until its cleaned up.  Even though petroleum is a liquid, they evaporate easily and become a vapor in the air, often odorless.  As the petroleum moves through soil and groundwater, vapors can enter buildings or structures through openings such as cracks, can make the air unsafe to breathe and potentially cause long-term and serious health issues.  It was determined that any remaining petroleum at the site does not appear to pose a significant risk to existing or future buildings or structures. 

In 2020, Ecology has determined that the cleanup actions performed at the site has shown that the site no longer poses a threat to human health or the environment. 


Map showing site location as Kittitas County, WA SITE INFORMATION


View Electronic Documents

Cleanup Site Details Report

Facility Site ID: # 3892

Cleanup Site ID: 5208

Ellensburg, Kittitas County

Status: Cleanup Started   Get definitions of Status terminology

Comment Period:
JULY 28, 2020 - AUGUST 27, 2020

John Mefford
Site Manager
(509) 454-7836

Rhonda Luke
Public Involvement Coordinator
(509) 457-7838

Document Repositories:

Central Regional Office
1250 W Alder St
Union Gap, 98903-0009