Big B Mini Mart
1611 Canyon Rd, Ellensburg, WA 98926


Ecology is providing an opportunity for the public to comment on an Interim Action Report, the Draft Cleanup Action Plan (DCAP), the Cleanup Action Plan Agreed Order (CAP AO), and the State Environmental Policy Act (SEPA) Checklist and Revised Determination of Nonsignificance (DNS).

Ecology is asking for your comments.

You are invited to:

    •  Review the Interim Action Report “Landfarming Pilot Test Summary Report” dated January 10, 2020

    •  Review the “Big B Mini Mart Draft Cleanup Action Plan” dated July 2020

    •  Review the Cleanup Action Plan Agreed Order dated October 12, 2020

    •  Review the SEPA Checklist and Revised DNS associated with the proposed Cleanup Action Plan dated October 12, 2020

    •  Send your comments to Ecology for consideration. Comments will be accepted October 12, 2020 through November 12, 2020

Submit your comments in writing to John Mefford at 1250 West Alder Street, Union Gap, WA 98903, by email: or online at Big B Mini Mart eComments.

An Interim Action is a partial or short-term cleanup of contamination while a long-term plan is worked on. A DCAP is a draft document of the final cleanup action selected, which specifies cleanup standards and methods and includes any environmental monitoring required during and after cleanup. An Agreed Order is a legal agreement between Ecology and the Potentially Liable Persons (PLPs) outlining the expectations, process, and schedule for site cleanup. SEPA is a legal tool for protecting the environment, which includes encouraging public involvement in decisions, requires environmental documents that are clear, concise and to the point, and evaluates possible environmental impacts. A SEPA Checklist is used to help determine potential environmental impacts if the proposed cleanup plan is carried out. A SEPA DNS documents the responsible official’s decision that a proposal is unlikely to have significant adverse environmental impacts.

Petroleum contains many chemicals that are harmful to human health and the environment. A new Agreed Order (AO) is necessary to implement the Cleanup Action Plan.

Aerial photo from Floyd Snider RI/FS Report
Please click on the photo for a larger view


The Site is the location of a former gas station and convenience store.  The Site began operating as a retail fueling station in the early 1970s.  In December 1990, soil and groundwater contamination from diesel fuel was discovered when an underground storage tank was replaced.  Additional investigation revealed that gasoline and other petroleum chemicals contaminated the soil and groundwater.

The Site was placed on Ecology’s Hazardous Sites List with a ranking of “3” in early 1999.  Sites on the Hazardous Sites List are a priority for Ecology, and have completed a Site Hazard Assessment (SHA).  A SHA provides information about the environmental risk of the Site. Risk is based on the amount of contaminants, how toxic they are, and how easily they can come in contact with people and the environment.  Sites are ranked relative to each other on a scale of “1” to “5”; with a rank of “5” being the lowest.

Big B Mini Mart Site Courtesy of Ellensburg Daily News
Please click on the photo for a larger view


After the discovery of the release, an independent remedial action was performed to remove petroleum-contaminated soil.  Approximately 420 cubic yards of contaminated soil was removed and disposed of offsite.  Wells to monitor groundwater were also installed and sampled in 1990 and 1991.  Groundwater sampling showed contamination above state cleanup levels were still present. 

In early 2014, the U.S. Environmental Protection Agency (EPA) recorded violations and issued a civil penalty for failing to monitor underground storage tanks (USTs).

Sampling in 2015 continued to show groundwater contamination above state cleanup levels.  Additional investigations revealed petroleum contamination throughout the site and an Interim Action to recover the free product began in 2016 and ended in 2017.  Free product is petroleum contamination, which is lighter than water, usually floats on top of groundwater.  This work was performed and completed in December 2018 under an Agreed Order for Remedial Investigation and Feasibility Study (RI/FS).  A Remedial Investigation (RI) uses data to see how far contamination has spread and a Feasibility Study (FS) looks at options to clean up contamination.

In 2019, the land treatment option of the proposed cleanup action identified in the FS as a cleanup alternative was performed on a portion of contaminated soil.  Land treatment usually consists of isolating an area onsite and placing contaminated soil in the controlled space, turned over frequently and is done in the warmer months to aid in the breakdown of contaminants.  The land treatment along with pumping oxygenated air into the soil are part of the proposed cleanup actions outlined in the Draft Cleanup Plan. 

From July 2019 to November 2019, an Interim Action was done that involved a pilot test called Landfarming to treat contaminated soil. Landfarming usually consists of preparing an isolated area, preferably onsite, is performed during warm months of the year with soil turned over periodically to allow air and the warmer temperatures to help degrade the contaminants. Natural sources of nitrogen and aerobic bacteria, such as liquid nitrogen and fertilizer granules, are often applied to aid in the biodegradation. The results of the pilot test Landfarming activities performed at this site produced some favorable results.

After the public comment period ends, Ecology will review and respond to comments received and will hold a public meeting if 10 or more people request one. Ecology may amend the documents based on your comments. If no revisions are necessary, the Agreed Order and Cleanup Action Plan will become final and the PLPs will proceed with the cleanup.


Map showing site location as Kittitas County, WA SITE INFORMATION


View Electronic Documents

Cleanup Site Details Report

Facility Site ID: # 386

Cleanup Site ID: 4901

Ellensburg, Kittitas County

Status: Cleanup Started   Get definitions of Status terminology

Comment Period:
OCTOBER 12, 2020 - NOVEMBER 12, 2020

Document Repositories:

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

Ellensburg Public Library
209 N Ruby St
Ellensburg, 98926