Facility Site ID: 765 Cleanup Site ID: 46

Site Background

Former Colville Post & Poles Facility
Former Colville Post & Poles Facility
The nearly 23-acre site is located at 396 Highway 395 North, four miles outside of Colville in Stevens County, Washington. The site is within 200 feet of the Colville River, which flows into Lake Roosevelt, a reservoir created by the Grand Coulee Dam on the Columbia River.

Colville Post & Poles, Inc., and several previous owners treated wood, primarily fence posts and rails, for about 60 years (1940s–2005) at this location. Raw wood was dipped in tanks of heated solution and then dried on nearby drip pads. Treated wood was stockpiled on the ground in various locations in the yard. 

Throughout the wood-treating period, pentachlorophenol and diesel leaked from piping and drip pads. In 1989, a 10,000-gallon above-ground storage tank leaked pentachlorophenol to the ground.

In 2000, the Confederated Tribes of the Colville Reservation petitioned the U.S. Environmental Protection Agency (EPA) to assess contamination at the site. Colville Post & Poles, Inc., closed down in 2005 when the owners couldn’t afford upgrades required to protect human health and the environment.


Cleanup at the Colville Post & Poles site is government-funded because the site owners/former operators are unable pay for it. The EPA and Ecology have taken interim cleanup actions (see details below) to protect human health and the environment while a final cleanup plan is developed. The public was invited to review and comment on the interim cleanup actions.

Ecology made the draft remedial investigation/feasibility study work plan and addendum available for public comment July 4 to September 2, 2016. We responded to comments from two parties and made some changes to the remedial investigation/feasibility study work plan following the comment period.

Ecology investigated the extent and locations of remaining contamination at the site and held a public comment period for the draft remedial investigation/feasibility study that assesses cleanup options November 29 to December 30, 2021. We responded to comments from one person and the Stevens County Commissioners. 

Our next step is to draft the cleanup action plan, which will be available for public comment before becoming final. The plan will propose a final cleanup for contaminated soil and groundwater.

EPA interim cleanup actions

In 2005 and 2006, the EPA investigated the site, demolished treatment and storage buildings, installed groundwater monitoring wells, and excavated and safely disposed of some contaminated soil, debris, and drummed wastes.

Ecology interim cleanup actions

When Eastern Washington Clean Sites Initiative funding became available in 2015, Ecology removed debris in and around surface water and concrete footings in the area where wood was treated, temporarily stockpiled debris as necessary, and conducted soil and groundwater assessments. Five groundwater samples contained pentachlorophenol and diesel at levels requiring cleanup.

Site use restrictions called institutional controls are in effect

Institutional controls can be fences, signs, or restrictions on how the property is used. For instance, an institutional control may prohibit installing drinking water wells or disturbing a protective cap that isolates contamination. These restrictions keep the contamination contained and keep people from being exposed to the contamination. The controls are usually listed in environmental covenants recorded with the county.

Periodic reviews are required when institutional controls are required at a site. Ecology conducts reviews to make sure the controls remain effective and the cleanup still protects human health and the environment. We conduct periodic reviews about every five years.

Environmental Covenant

County Recording #: 20120005974
County Recording Date: 8/9/2012


  • Control Stormwater
  • Ongoing Maintenance of Remedy
  • Prohibit Soil Disturbance
  • Restrict Access
  • Restrict Land Use

Restricted Media

  • Soil
Legal 1
Document Title Document Date Document Type
Colville Post and Pole Covenant 8/9/2012 Environmental Covenant; Alternative Mechanism
Public Information 7
Document Title Document Date Document Type
Response to Comments: RI/FS Colville Post & Poles 2/11/2022 Responsiveness Summary
Options for Cleaning Up Colville Post & Poles 11/12/2021 Fact Sheet\Public Notices
Response to Comments: Colville Post & Poles RI/FS Work Plan 11/3/2016 Responsiveness Summary
Colville Post & Poles - Remedial Investigation Work Plan Fact Sheet 6/17/2016 Fact Sheet\Public Notices
Responsiveness Summary CPPS Work Plan, SAP, PPP 3/26/2015 Responsiveness Summary
Public Participation Plan Colville Post & Poles IA 2015 2/6/2015 Public Participation Plan
Fact Sheet Interim Action Colville Post & Poles 2/6/2015 Fact Sheet\Public Notices
State Environmental Policy Act 2
Document Title Document Date Document Type
SEPA DNS Colville Post & Poles IA 2015 2/6/2015 SEPA Documents
SEPA Checklist Colville Post & Poles IA 2015 2/6/2015 SEPA Documents
Technical Reports 8
Document Title Document Date Document Type
Remedial Investigation and Feasibility Study: Colville Post & Poles 6/28/2018 Remedial Investigation / Feasibility Study
Final Remedial Investigation/Feasibility Study Work Plan: Colville Post & Poles 11/3/2016 Remedial Investigation Work Plan
RI/FS Work Plan Addendum: Colville Post & Poles 8/9/2016 Remedial Investigation Work Plan
Draft Remedial Investigation Work Plan: Colville Post & Poles 6/14/2016 Remedial Investigation Work Plan
Pre-RI Soil and Groundwater Site Assessment, Wetland Delineation, & Interim Action Completion Report 1/22/2016 Interim Action Documents
Interim Action Sampling & Analysis, Health & Safety Plans CPPS 2015 1/16/2015 Interim Action Documents
Work Plan Interim Actions CPPS 2015 1/16/2015 Interim Action Documents
Phase II Removal Site Evaluation: Colville Post and Pole, Stevens County, Washington 12/19/2005 Site Specific Technical Document - other
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

  • Eastern Regional Office
    N 4601 Monroe St
    Spokane, 99205-1265
    Please schedule an appointment to view print documents at this location.
  • Colville Public Library
    195 South Oak Street
    Colville, 99114
    This location may only have print documents available during open comment periods.

Contaminants 2

Contaminant Type
Surface Water
Non-Halogenated Organics - Petroleum Products-Unspecified C S
Non-Halogenated Organics - Phenolic Compounds C C
Confirmed Above Cleanup Levels
Below Cleanup Levels
This contaminant list was based on our best information at the time it was entered. It may not reflect current conditions at the site.