Summary Information
(last updated on: 9/24/2018 5:29:01 PM)
(9/21/18 DEH) The Columbia Helicopters (CHI) site is located near Aurora, Oregon. CHI has operated at the 19.5 –acre site since 1976 . Site operations consist of rebuilding, repairing, and maintenance of helicopters. From 1976 to 1985, wastes from parts cleaning, paint stripping, and etching and alodyning activities were discharged to a dry well at the site. In October 1986, CHI removed the dry well and approximately 100 tons of soil containing chemicals. However, because of the close proximity of site buildings to the dry well, excavation ceased before all of the visually impacted soil was removed to protect the integrity of the buildings. CHI began investigating the extent of contamination at the facility in 1987 under DEQ oversight. Investigation results indicated that soil and groundwater near the dry well contained solvents, primarily 1,1,1-trichloroethane (TCA) and dichloroethene (DCE). The TCA- and DCE-containing groundwater extends approximately 1200 feet northeast and east of the facility. The depth of the plume offsite is between 65 to 80 feet below ground surface. The chemicals did not contaminated the deeper Troutdale Aquifer, which is the regional drinking water aquifer. Domestic wells in the area access groundwater from the deeper Troutsdale formation and solvents have not been detected in these wells. CHI initiated interim groundwater extraction and treatment in 1991 to provide containment of the chemical-containing groundwater. CHI submitted a Final Corrective Measures Report. After considering public comments, the DEQ selected the site cleanup program for the site and entered a Record of Decision (ROD). The ROD required several activities inlcuding more groundwater pump and treat, soil vapor extraction, replacing two domestic wells. CHI entered into a Consent Decree in 2000 to complete the cleanup as specified in the ROD. In September 2018 DEQ issued Certification of Completion indicating completion of the main elements of the remedial action have been complete. The Certification requires ongoing actions including continued groundwater monitoring and reporting, annual notices to owners of affected properties, annual water well development review, and an annual review of site institutional controls.
General Site Information
Site: Columbia Helicopters (ECSI Site ID: 30) CERCLIS (EPA) Id
Project Manager: Donald Hanson Investigative Status:Listed on the Confirmed Release List or Inventory
PM Phone: (541) 687-7349 NPL(National Priority Listing):No
Address: 14452 Arndt Rd. NE Is this site an Orphan?No
Aurora, 97002 Is this site a brownfield?No
County: MARION Action Underway or Needed: Periodic Review
Region: Western Region Click for more details ...  
NOTE: This site has one or more long-term controls designed to manage site risks. Click here for details.

Site Documents
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File NameCategory File Size MB Document Date Upload Date
EES_CHI_08152018.pdf E&ES documents 0.6813 8/15/2018 8/21/2018
EES_CHI_2000.pdf E&ES documents 0.3536 5/22/2000 8/24/2018
RDRA_ConsentDecree_2000pdf.pdf Orders/Consent Judgments 7.4636 4/25/2000 8/24/2018
0030_CHI_CertificationOfCompletion_09212018.pdf Orders/Consent Judgments 3.3038 9/21/2018 9/24/2018
CHI_2018 Annual Report_31Dec2018.pdf Reports 10.6609 12/31/2018 6/5/2019
2019_AnnualReport_NoAppendicies.pdf Reports 2.6561 12/30/2019 3/25/2020
0300-CHI_2021 Annual Report_12-31-2021.pdf Reports 10.5935 12/31/2021 3/7/2022
CHI_2022 Annual Report_12-30-2022.pdf Reports 7.7004 12/30/2022 2/27/2023
ColumbiaHelicoptersROD.pdf RODs/Staff Reports 4.9792 12/19/1997 10/26/2017
CHI 2017 RDRA SOW Updte_2017-11-29.pdf RODs/Staff Reports 8.1786 11/29/2017 4/19/2018
CHI Closure Report_2018-05-01.pdf RODs/Staff Reports 10.8403 5/1/2018 5/10/2018
CHI Revised monitoring plan-2012.pdf Work Plans 0.1857 5/16/2013
Columbia HelicoptersDecreeAndSOW.pdf Work Plans 6.5281 4/22/2000 8/29/2017
WorkPlanAddendumCHI 2017 RDRA Updte_2017-11-29.pdf Work Plans 8.1738 11/29/2017 5/10/2018
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Department of Environmental Quality
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