10 International Way, Longview, WA 98632

Aerial photo of the former International Paper Facility
Please click on the photo for a larger view


Last Updated June 27, 2018

Last fall, we accepted public comments on the draft Remedial Investigation and Feasibility Study (RI/FS) and related documents. Our 45 day comment period ended on Oct. 2. We also hosted an open house and public hearing on Sept. 28th at the Cowlitz County Event Center in Longview. About 30 people showed up and 10 people provided oral comments. In total, we received 24 comments about this cleanup site.

Our responses to public comments are now available in our Responsiveness Summary.


How will the site be cleaned up?
Cleanup options are outlined in the final Remedial Investigation and Feasibility Study report. We will make a decision about how the site will be cleaned up in the next phase - the draft cleanup action plan.  

Soil Cleanup Options

There are ten soil cleanup options outlined in the RI/FS prepared by International Paper as well as another alternative proposed by the Port of Longview. The options include a variety of excavation, disposal, and treatment activities. All soil cleanup options include:

  • An environmental covenant that places conditions on future excavation at the site until soil cleanup levels are achieved.
  • An asphalt pavement to prevent direct contact because some contaminated soil will remain on site.
  • Groundwater monitoring to ensure contamination is not moving.
We highlight three cleanup options here, but all options are described in the draft RI/FS. We want to hear what you think about all the options before deciding which cleanup action would be best for this site.
Alternative S1- Baseline alternative

This remedy includes excavating and landfilling or treating off site all soil located above a silt layer containing dangerous chemicals at concentrations exceeding the cleanup level. Cleanup levels would be met within two years of implementation. 
Alternative S5B - International Paper’s preferred alternative
This alternative divides the MFA into three zones. Zone 1 is an area the Port of Longview is considering for future development. Soils in Zone 1 would be excavated down to a silt layer and backfilled using clean soil. The excavated soils from Zone 1 would be moved to Zones 2 and 3.

The relocated soils from Zone 1 and the soils in Zone 2 would be mixed with materials to solidify the soil. Three feet of clean material would be placed above the solidified soil, which would allow the Port of Longview to perform utility and other shallow site work without restrictions. The relocated Zone 1 soils and the soils in Zone 3 would be solidified with 1 foot of clean material above the solidified soil. Cleanup levels would be met within two years of implementation. 

Port of Longview’s proposed preferred alternative
The Port of Longview has proposed to Ecology and International Paper another alternative not included in the draft RI/FS. They propose excavation and off-site disposal of less contaminated soils and on-site treatment of more heavily contaminated soils remaining in the MFA.

Groundwater cleanup options
There are four groundwater cleanup options outlined in the draft RI/FS. International Paper’s preferred alternative is Alternative GW4 – monitored natural attenuation. The Port of Longview’s preferred alternative is Alternative GW2 with active treatment postponed or eliminated if groundwater monitoring after soil cleanup activities indicates that treatment is not necessary.

Alternative GW1 – Electrical resistance heating and enhanced biodegradation
This remedy uses electricity to heat the ground to vaporize or degrade chemicals. It also uses bacteria (microorganisms) to breakdown contamination. Cleanup levels would be met within six years of implementation.
Alternative GW2 – Chemical oxidation and monitored natural attenuation
This remedy would inject reactive chemicals into groundwater to degrade the contamination. This alternative also includes monitoring groundwater concentrations to ensure contaminants are degrading at an appropriate rate under natural conditions. Cleanup levels would be met within seven years of implementation.

Alternative GW3 – Active biosparging
This remedy would inject native bacteria (microorganisms), food for the bacteria, and oxygen into the groundwater to degrade the contamination. Cleanup levels would be met within 20 years of implementation.

Alternative GW4 – Monitored natural attenuation
This remedy would monitor groundwater concentrations to ensure contaminants are degrading at an appropriate rate under natural conditions. However, this alternative has a condition that if it does not work as predicted, they will implement Alternative GW2 – chemical oxidation. Cleanup levels would be met within 40 years of implementation


Between 1937 and 1982, International Paper treated wood in the Treated Wood Products (TWP) Area. Between 1947 and 1953, wastewater from the wood-treatment process was moved through a ditch to a nearby impoundment located in the area now called the MFA. In 1953, International Paper stopped discharging liquid wastes to the MFA and switched to two ponds within the TWP Area. In 1982, International Paper stopped treating wood. In 1985, International Paper excavated some of the contaminated soils in the TWP Area. In 1989, the remaining contaminated soils were capped.


Operations at the TWP Area were discontinued in 1982, and International Paper dismantled the wood treatment operations, with the exception of the boiler house and the treatment building foundation. They submitted a closure plan to the U.S. Environmental Protection Agency (EPA) and Ecology in 1985. In 1985, International Paper excavated contaminated soils from several locations in the TWP Area, including two surface impoundments - ponds designed to hold liquid waste materials.

The excavated soil was disposed of at a permitted treatment, storage, and disposal facility (TSD). International Paper capped remaining contaminated soils in the former ponds and process areas with a low permeability cover in 1989. Nearly all structures in the TWP Area (buildings, tanks, and related hardware) were removed or capped as part of closure activities.

In 1997, the Department of Ecology requested additional cleanup in the TWP Area to ensure long-term protection of human health and the environment.
In 1997 and 1998, International Paper: 

  • Constructed a subsurface barrier wall around the TWP Area to contain contaminated soil and groundwater.
  • Capped the area with an additional low permeability cover.
  • Installed systems to remove floating light non-aqueous phase liquid (LNAPL) within the contained area.
  • Installed a treatment system that added oxygen to contaminated soil to increase the rate that microorganisms consumed contaminants.
  • Installed groundwater monitoring wells to monitor the subsurface barrier wall.  


Map showing site location as Cowlitz County, WA SITE INFORMATION


View Electronic Documents

Cleanup Site Details Report

Facility Site ID: # 1080

Cleanup Site ID: 3685

Longview, Cowlitz County

Status: Cleanup Started   Get definitions of Status terminology

Kerry Graber
Project Manager
(360) 407-0241

Kaia Petersen
Site Manager
(360) 407-6359

Bridgette Valdez-Kogle
Public Involvement Coordinator
(360) 407-7616

Document Repositories:

Southwest Regional Office
300 Desmond Dr SE
Lacey, 98503-1274

Longview Public Library
1600 Louisiana Street
Longview, 98632