Sunfair Chevrolet Inc
1600 E Yakima Ave, Yakima, WA 98901


Periodic Review Draft Report Completed

Ecology invites you to review and comment on the draft Periodic Review report for the Sunfair Chevrolet Site:

2021 Periodic Review

Comments will be accepted November 18, 2021 through December 20, 2021.  

You may submit your comments online or by mail to Frank Winslow, Periodic Reviewer, at Ecology's Central Regional Office. 

A periodic review is conducted at least every five years after the initiation of a cleanup action at a Site when required by the Model Toxics Control Act (MTCA).  The purposes of the review are to evaluate Site conditions after cleanup is considered complete, and to ensure protection of human health and the environment when institutional controls are used as part of a remedy.

We will review comments received during the comment period and make recommendations for suggested changes.  The periodic review will become final if no significant changes are made.  An additional public comment period will be held if significant changes are made.


The Site is an auto dealership and service facility.  In March 1998, five underground storage tanks (USTs) were removed from the Site.  Tanks 1 through 4 each had a capacity of 1,000 gallons, and Tank 5 had a capacity of 3,000 gallons. Tank 1 contained motor oil, Tank 2 contained automatic transmission fluid, Tank 3 contained waste motor oil, Tank 4 contained diesel and Tank 5 contained waste motor oil. The tanks appeared to be in good condition upon removal. 


Petroleum-contaminated soil was removed from the Tank 3 excavation pit until no visual indication of contamination remained.  During removal, contamination was found to extend below the groundwater table.  Following removal, soil samples were collected from the bottom and edges of the excavation pit and a groundwater sample was collected from groundwater flowing into the excavation pit.  The final samples were analyzed for total petroleum hydrocarbons (TPH), and all detected concentrations were below MTCA Method A cleanup levels, except at Sample Number 6.
Sample Number 6 was collected beneath the concrete slab apron at the entrance to the facility. TPH-O (oil) was detected above MTCA Method A cleanup levels.  However, since the consultant considered the environmental threat to be minimal, the residual petroleum contaminated soil was left in place to prevent disturbance to site operations. The environmental threat was determined to be minimal by the consultant due to the lack of petroleum contamination in groundwater, and the isolation of the contaminated soil by the concrete slab above.  The petroleum-contaminated soil excavated from Tank 3 was reportedly stored on adjacent property for remediation by land farming.  
In an attempt to reduce the level of methylene chloride contamination found in the Tank 5 excavation pit, the excavation was left open for several weeks to allow the methylene chloride to volatilize.  No sources were identified for the methylene chloride contamination.

An institutional control was imposed to prevent exposure to hazardous substances remaining at the Site. The institutional control consists of a surface cap formed by building foundations and a concrete pad or asphalt pavement over the area of concern.  To ensure protectiveness of the remedy, an environmental covenant was recorded to prohibit or limit activities that would interfere with the integrity of the surface cap. 


Based upon cleanup activities and the recording of the environmental/restrictive covenant, Ecology has determined the site is no longer a threat to human health and the environment. Ecology issued a No Further Action determination in February 2015.

You can find site documents by using the “View Electronic Documents” link in the bar on the right, or requesting information from the Central Regional Office public records coordinator.


Map showing site location as Yakima County, WA SITE INFORMATION


View Electronic Documents

Cleanup Site Details Report

Facility Site ID: # 49569148

Cleanup Site ID: 6173

Yakima, Yakima County

Status: No Further Action   Get definitions of Status terminology

Comment Period:
NOVEMBER 18, 2021 - DECEMBER 20, 2021

Frank Winslow
Periodic Review Coordinator
(509) 454-7835

Document Repositories:

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