Main & J St, Palouse, WA 99161

Southern view of property before cleanup
Please click on the photo for a larger view


The site was used for over a century for commercial activities serving the agricultural industry (service station, blacksmith, welding shop). Many of the past uses could have contributed contamination.

Conoco operated a service station on the site from 1955 to 1977. During its operation, five above-ground storage tanks and four underground storage tanks were installed. 

In 1977, Palouse Producers began operations and used the facility to fuel vehicles and store and distribute bulk fuel until approximately 1985.

Historical documents show the facility was poorly constructed to contain spills and drips from historical operations and that spills occurred on the site. In addition, tanks and piping appear to have leaked. There is also evidence that these releases may have reached the Palouse River through overland flow or groundwater migration.


Past investigations found metals, petroleum hydrocarbons, and associated contaminants at the site. The former service station operated by Conoco and later by Palouse Producers is the likely cause of the environmental impacts to soil and groundwater.


By 1992 all above-ground and underground storage tanks were removed from the site.  From 1984 to 1985, several efforts were made to clean up petroleum product that had entered the Palouse River from the site. 
The City of Palouse received an Integrated Planning Grant from Ecology to investigate and clean up remaining contamination. You can learn more on their City of Palouse Brownfield Project website.
In the 2011 Cleanup Action Plan, we selected the following cleanup actions:
  • Installing and monitoring of three groundwater monitoring wells
  • Restricting groundwater use at the property and enacting a Soil Management Plan to guide future uses
  • Removing soil that with contamination levels that exceed standards set to protect people and environment (soil not exceeding these levels remained on-site) 

Periodic reviews

A periodic review is conducted at least every 5 years after beginning cleanup at a site when contamination remains there. The purpose of the review is to evaluate site conditions after intital cleanup is complete to ensure people and the environment are protected.
In July 2020, we completed the first periodic review and recommended no further cleanup actions. Groundwater monitoring will continue to track cleanup progress. The property has been purchased, and redevelopment may proceed as long as monitoring well access is maintained. The owners are working with us to ensure their plans will protect the cleanup and comply with the environmental covenants.


Map showing site location as Whitman County, WA SITE INFORMATION


View Electronic Documents

Cleanup Site Details Report

Facility Site ID: # 787

Cleanup Site ID: 4973

Palouse, Whitman County

Status: Construction Complete-Performance Monitoring   Get definitions of Status terminology

Sandra Treccani
Site Manager
(509) 329-3412

Erika Beresovoy
Public Involvement Coordinator
(509) 329-3546

Document Repositories:

Eastern Regional Office
N 4601 Monroe St
Spokane, 99205-1265

Whitman County Library Palouse Branch
120 East Main Street
Palouse, 99161