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Stimson Lumber Company

Air Toxics Health Risk Assessment Status

Cleaner Air Oregon is a health-based permitting program that regulates emissions of toxic air contaminants from facilities based on risk to nearby communities. CAO requires facilities to report toxic air contaminant emissions, assess potential health risks to people nearby and reduce toxic air contaminant risk if it exceeds health standards.
As part of the Cleaner Air Oregon process, each facility has a dedicated web page to provide communities access to facility information and updates on where it is involved in the process.
  • Each step of the CAO risk assessment process has a section that includes DEQ’s communications and deliverables from the facility.
  • A color-coded graphic shows where a facility is in the Cleaner Air Oregon Process.
  •  For additional information and history of the program, visit the Cleaner Air Oregon website.

Air Toxics assessment process

process diagram

​July 2, 2020: Facility called in to CAO program.

Sept. 30, 2020: Facility submitted Emissions Inventory and supporting cover letter.

Jan. 28, 2021: DEQ responded to Emissions Inventory with request for additional information.
April 23, 2021: Facility submitted response to information request.
March 1, 2022: DEQ responded to the Emissions Inventory submittal with request for additional information.
April 18, 2022: Facility submitted revised Emissions Inventory. 

June 30, 2022: DEQ issues Warning Letter With Opportunity to Correct, requiring updates to the Emissions Inventory and additional documentation

July 29, 2022: Facility submitted extension request for certain corrective actions listed in the Warning Letter with Opportunity to Correct.
Aug. 8, 2022: DEQ responded to the extension request with an Amended Warning Letter with Opportunity to Correct.
Aug. 15, 2022 and Aug. 29, 2022:​ Facility submitted revised Emissions Inventory
Oct. 11, 2022: DEQ issues Pre-Enforcement Notice, requiring updates to the Emissions Inventory and additional documentation.

About the facility 

The Stimson Lumber Company presently houses a saw mill, a planer mill and a wet process hardboard mill. The sawmill and planer mill produce 6' to 10' premium studs for retail markets out of Douglas-fir and Hemlock logs. Most of the logs are supplied from the 472 acre-forest land adjacent to the mill, although Stimson owns half a million acres of forest land throughout the Pacific Northwest. The hardboard plant utilizes the Douglas-fir sawdust and wood chips from the saw mill and presses it into a high density panel used for retail and industrial uses. The finished lumber and hardboard can be shipped to market via trucks or rail (specifically by Portland & Western Railroad, which connects to Union Pacific Railroad). The mill offers loading for center beam cars, maxi trucks, flatbed trucks and vans.

DEQ contact

Site address

49800 SW Scoggins Valley Rd,
Gaston, OR 97119

Current air permit 

Permit type: Title V 

Permit #34-2066