Facility Site ID: 386 Cleanup Site ID: 4901

Site Description

Aerial photo from Floyd Snider RI/FS Report
Aerial photo from Floyd Snider RI/FS Report
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.

Cleanup Activities

Big B Mini Mart Site Courtesy of Ellensburg Daily News
Big B Mini Mart Site Courtesy of Ellensburg Daily News
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 was held in late 2020 and no comments were received, the Agreed Order and Cleanup Action Plan became final and the PLPs are proceeding with the cleanup.

From 2021 to 2022, the following cleanup actions were performed:

  • Excavation of contaminated soil (as shown in Figure 2.1 of the Remedial Action Completion Report)
  • On-site landfarming of excavated soil
  • Transportation and proper disposal of some petroleum-contaminated soil at a permitted landfill
  • Installation of monitoring wells and groundwater monitoring
  • Sub-slab vapor assessment at the station building
Legal 15
Document Title Document Date Document Type
Big B Mini Mart - CAP Agreed Order - DE 18243 10/12/2020 Agreed Order
Big B Mini Mart - Agreed Order DE 16307 - IA DCAP 5/20/2019 Agreed Order
Big B Mini Mart - Satisfaction of AO DE 10813 Letter 12/10/2018 Agreed Order
Big B Mini Mart RI/FS Agreed Order No. DE 10813 3/23/2015 Agreed Order
Big B Mini Mart Final PLP letter - Singh 3/5/2015 Final Potentially Liable Person Status Letter
Big B Mini Mart Final PLP letter 8/7/2014 Final Potentially Liable Person Status Letter
Big B Mini Mart Final PLP ltr Short Stop 1/6/2012 Final Potentially Liable Person Status Letter
Big B Mini Mart Final PLP Ltr BNSF 1/6/2012 Final Potentially Liable Person Status Letter
Big B Mini Mart PLP ltr Kaila 1/6/2012 Final Potentially Liable Person Status Letter
Big B Mini Mart combined ENL and 30-day notice of potential liability 9/12/2011 Early Notice Letter
Big B Mini Mart ENL Kaila 9/12/2011 Early Notice Letter
Big B Mini Mart ENL Short Stop 4/7/2011 Early Notice Letter
Big B Mini Mart ENL BNSF 4/7/2011 Early Notice Letter
Big B Mini Mart ENL Kaila 6/21/1991 Early Notice Letter
Big B Mini Mart ENL Singh 6/19/1991 Early Notice Letter
Public Information 8
Document Title Document Date Document Type
Big B Mini Mart - Remedial Action Completion Report Fact Sheet 12/30/2022 Fact Sheet\Public Notices
Big B Mini Mart - CAP Agreed Order - Fact Sheet 10/12/2020 Fact Sheet\Public Notices
Big B Mini Mart - IA AO Fact Sheet 5/20/2019 Fact Sheet\Public Notices
Big B Mini Mart - RI/FS Fact Sheet 9/27/2018 Fact Sheet\Public Notices
Big B Mini Mart Responsiveness Summary 10/18/2016 Responsiveness Summary
Big B Mini Mart Interim Action and SEPA DNS fact sheet 9/12/2016 Fact Sheet\Public Notices
Big B Mini Mart RI/FS AO Fact Sheet 3/23/2015 Fact Sheet\Public Notices
Big B Mini Mart Public Participation Plan 6/1/2014 Public Participation Plan
State Environmental Policy Act 5
Document Title Document Date Document Type
Big B Mini Mart - SEPA - Revised DNS 10/12/2020 SEPA Documents
Big B Mini Mart - SEPA Environmental Checklist 10/12/2020 SEPA Documents
Big B Mini Mart - SEPA - DNS - Checklist 5/20/2019 SEPA Documents
Big B Mini Mart SEPA DNS 9/1/2016 SEPA Documents
Big B Mini Mart SEPA Environmental Checklist 8/30/2016 SEPA Documents
Technical Reports 34
Document Title Document Date Document Type
Big B Mini Mart - Remedial Action Completion Report 11/1/2022 Site Specific Technical Document - other
Big B Mini Mart - Bioventing Pilot Test Work Plan 3/25/2022 Site Specific Technical Document - other
Big B Mini Mart - Ecology Approval of CAP Reports 11/23/2020 Site Specific Administrative Document - other (Administrative correspondence)
Big B Mini Mart - Cleanup Action Plan 11/1/2020 Site Specific Technical Document - other
Big B Mini Mart - BNSF Response to AO Negotiation Invitation 2/13/2020 Site Specific Administrative Document - other (Administrative correspondence)
Big B Mini Mart - Invitation to Participate in Agreed Order Negotiations - S Singh 1/31/2020 Site Specific Administrative Document - other (Administrative correspondence)
Big B Mini Mart - Invitation to Participate in Agreed Order Negotiations - Sahota 1/31/2020 Site Specific Administrative Document - other (Administrative correspondence)
Big B Mini Mart - Invitation to Participate in Agreed Order Negotiations - Kang 1/31/2020 Site Specific Administrative Document - other (Administrative correspondence)
Big B Mini Mart - Invitation to Participate in Agreed Order Negotiations - Kaila 1/31/2020 Site Specific Administrative Document - other (Administrative correspondence)
Big B Mini Mart - Invitation to Participate in Agreed Order Negotiations - B Singh 1/31/2020 Site Specific Administrative Document - other (Administrative correspondence)
Big B Mini Mart - Invitation to Participate in Agreed Order Negotiations - BNSF 1/31/2020 Site Specific Administrative Document - other (Administrative correspondence)
Big B Mini Mart - Landfarming Pilot Test Summary Report 1/10/2020 Interim Action Documents
Big B Mini Mart - Conditional Approval of Land Treatment IAWP 6/21/2019 Site Specific Administrative Document - other (Administrative correspondence)
Big B Mini Mart - Ecology response to Public Comment on RI/FS 11/19/2018 Site Specific Administrative Document - other (Administrative correspondence)
Big B Mini Mart Invitation to Participate in Negotiations for AO 10/22/2018 Site Specific Administrative Document - other (Administrative correspondence)
Big B Mini Mart - RI/FS August 2018 8/9/2018 Remedial Investigation / Feasibility Study
Big B Mini Mart PLP status deferral - Schneider 6/1/2018 Site Specific Administrative Document - other (Administrative correspondence)
Big B Mini Mart 30 Day Notice of Potential Liability - Schneider 4/3/2018 Site Specific Administrative Document - other (Administrative correspondence)
Big B Mini Mart Interim Action Work Plan 9/1/2016 Interim Action Documents
Big B Mini Mart Investigation Summary and Supplemental Work Plan 2/5/2016 Remedial Investigation Work Plan
Big B Mini Mart 30-day notice of potential liability - Neela Tara 12/22/2014 Site Specific Administrative Document - other (Administrative correspondence)
Big B Mini Mart 30-day notice of potential liability - Singh 12/18/2014 Site Specific Administrative Document - other (Administrative correspondence)
Big B Mini Mart Site Investigation Work Plan 12/15/2014 Site Specific Technical Document - other
Big B Mini Mart 30-day notice of potential liability 7/8/2014 Site Specific Administrative Document - other (Administrative correspondence)
Big B Mini Mart 30-day notice of potential liability - Short Stop 5/19/2011 Site Specific Administrative Document - other (Administrative correspondence)
Big B Mini Mart 30-day notice of potential liability - Kaila 5/19/2011 Site Specific Administrative Document - other (Administrative correspondence)
Big B Mini Mart 30-day notice of potential liability - BNSF 5/19/2011 Site Specific Administrative Document - other (Administrative correspondence)
Big B Mini Mart SHA Results Notification - updated rank 2004 7/16/2004 Site Specific Administrative Document - other (Administrative correspondence)
Big B Mini Mart SHA Results Notification - updated rank 1992 8/19/1992 Site Specific Administrative Document - other (Administrative correspondence)
Big B Mini Mart - Site Hazard Assessment 1992 re-rank 8/13/1992 Site Hazard Assessment Report
Big B Mini Mart SHA Results Notification 8/16/1991 Site Specific Administrative Document - other (Administrative correspondence)
Big B Mini Mart Soil and Groundwater Investigation Report 5/21/1991 Site Specific Technical Document - other
Big B Mini Mart draft SHA Report 5/1/1991 Site Hazard Assessment Report
Big B Mini Mart SHA Planned Notification 2/11/1991 Site Specific Administrative Document - other (Administrative correspondence)
There may be more documents related to this site. To obtain documents not available electronically, you will need to make a public records request.

Places to see print documents

  • Central Regional Office
    1250 W Alder St
    Union Gap, 98903-0009
    Please schedule an appointment to view print documents at this location.
  • Ellensburg Public Library
    209 N Ruby St
    Ellensburg, 98926
    This location may only have print documents available during open comment periods.

Contaminants 2

Contaminant Type
Soil
Groundwater
Surface Water
Air
Sediment
Bedrock
Non-Halogenated Organics - Petroleum-Diesel C C
Non-Halogenated Organics - Petroleum-Gasoline C C
S
Suspected
C
Confirmed Above Cleanup Levels
B
Below Cleanup Levels
RA
Remediated-Above
RB
Remediated-Below
R
Remediated
This contaminant list was based on our best information at the time it was entered. It may not reflect current conditions at the site.