Summary Information
(last updated on: 12/27/2019 12:47:38 PM)
DEQ is completing its investigation and cleanup of contamination from a June 3, 2016 spill of Bakken crude oil that occurred when a train derailed in Mosier. Sixteen cars of a 96-car train derailed, and three of the cars caught fire. Approximately 47,000 gallons of oil escaped from those four rail cars. One of the cars tore off the lid of a manhole. As a result, approximately 13,000 gallons of the oil flowed into the nearby wastewater treatment plant, from where it was pumped out and taken to an offsite disposal facility. Initial cleanup involved excavation and offsite disposal of 2,960 tons of petroleum-contaminated soil. Union Pacific Railroad (UPRR) estimates that this contaminated soil contained 18,000 gallons of oil. UPRR estimates that the remaining 16,000 gallons of oil burned during the fire. Oil remaining in the derailed cars was successfully and safely transferred by truck to The Dalles, and then hauled by rail to Tacoma, Washington, its original destination. The emptied rail cars were taken by truck to Portland. A biosystem was operated from August 2016 until March 2019. Impacts to the environment were assessed based on testing of soil, groundwater, and wetland sediment and porewater. Groundwater at 11 monitoring wells was tested in June 2019, approximately 90 days after the treatment system was shut down, to assess whether contaminant concentrations would increase. Results indicate that contaminant levels remain below concentrations of concern. DEQ therefore intends to allow UPRR to decommission the treatment system and the groundwater monitoring wells. For more information, contact DEQ Project Manager Bob Schwarz, 541-298-7255, ext. 230;
General Site Information
Site: Mosier UPRR Derailment (ECSI Site ID: 6115) CERCLIS (EPA) Id
Project Manager: Robert Schwarz Investigative Status:Contamination Suspected
PM Phone: (503) 229-5128 NPL(National Priority Listing):No
Address: Near Rock Creek Rd. Is this site an Orphan?No
Mosier, 97040 Is this site a brownfield?No
County: WASCO Action Underway or Needed: CONFIRMATION SAMPLING
Region: Eastern Region Click for more details ...  
Site Documents
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File NameCategory File Size MB Document Date Upload Date
2019-03-08-DEQ approval of rebound test.pdf Correspondence 0.1992 3/8/2019 3/8/2019
Mosier derailment Fact Sheet 6-7-2016 - final with Spanish.pdf Fact Sheets 0.0900 6/7/2016 6/7/2016
Mosier Status Memo-2016-07-08.pdf Fact Sheets 0.0963 7/20/2016 7/20/2016
6115-Fact-Sheet-7-20-2016.pdf Fact Sheets 0.2057 7/20/2016 7/20/2016
Mosier Status Memo-2016-06-22.pdf Memos 0.0519 6/22/2016 7/8/2016
Mosier Status Memo-2016-06-12.pdf Memos 0.0524 6/12/2016 7/8/2016
Mosier Status Memo-2016-08-17.pdf Memos 0.0148 8/17/2016 8/17/2016
Well Construction and soil boring logs-two extraction wells, four monitoring wells.pdf Miscellaneous 0.1484 6/16/2016 7/22/2016
108171_daily_summary_20160604.pdf Reports 2.4041 6/4/2016 7/1/2016
108171_daily_summary_20160605.pdf Reports 3.0553 6/5/2016 7/1/2016
108171_daily_summary_20160606.pdf Reports 3.1842 6/6/2016 7/1/2016
108171_daily_summary_20160607.pdf Reports 3.5054 6/7/2016 7/1/2016
108171_daily_summary_20160608.pdf Reports 3.3466 6/8/2016 7/1/2016
108171_daily_summary_20160609.pdf Reports 3.0800 6/9/2016 7/1/2016
108171_daily_summary_20160610.pdf Reports 3.4838 6/10/2016 7/1/2016
108171_daily_summary_20160611.pdf Reports 3.1880 6/11/2016 7/1/2016
108171_daily_summary_20160612.pdf Reports 2.1462 6/12/2016 7/1/2016
108171_daily_summary_20160614.pdf Reports 1.4520 6/14/2016 7/1/2016
108171_daily_summary_20160615.pdf Reports 1.6701 6/15/2016 7/1/2016
108171_daily_summary_20160616.pdf Reports 1.4269 6/16/2016 7/1/2016
108171_daily_summary_20160617.pdf Reports 1.4548 6/17/2016 7/1/2016
Mosier Status Memo-2016-08-24.pdf Reports 0.1223 8/24/2016 9/30/2016
Mosier Status Memo-2016-10-07.pdf Reports 0.0105 10/7/2016 10/7/2016
2016-08-16-OSU-MosierReport.pdf Reports 4.0348 8/16/2016 10/26/2016
Mosier Status Memo-2016-11-29.pdf Reports 2.7657 11/29/2016 11/29/2016
Mosier Status Memo-2017-01-25.pdf Reports 1.3997 1/25/2017 1/26/2017
Mosier Status Memo-2017-03-23.pdf Reports 1.3095 3/24/2017 3/24/2017
2016-10-28-CH2M-UPRRMosierRpt.pdf Reports 14.1768 10/28/2016 9/14/2017
CH2M-GroundwaterDataSummary-text, tabls, figs (6-9-17).pdf Reports 7.6475 6/9/2017 9/14/2017
Mosier PFAS Results 022119_final.pdf Reports 7.8190 2/22/2019 3/5/2019
2019-02-12-Jacobs-QuarterlyReport_2018_Q4.pdf Reports 14.9554 2/12/2019 3/5/2019
2019-07-23-QuarterlyReport_2019_Q1_Q2_Rebound.pdf Reports 9.4592 7/23/2019 8/20/2019
2016-07-22-CH2M-Mosier Biosparge Work Plan.pdf Work Plans 0.2917 7/22/2016 8/16/2016
Mosier Unit Train Derailment Sampling Plan-rev 2016-07-24.pdf Work Plans 1.1414 7/24/2016 8/16/2016
Site Links
Click the link to open the web page.
Oregon Train Derailment Washington Ecology
EPA Emergency Response Mosier Incident Page EPA Emergency Response Incident Page
UP: Mosier Update UPRR Mosier Incident Page

Click on the Photograph to see a larger version.

View looking West immediately after derail and prior to fire.
View looking West during fire.
Rail cars following fire
View west of boom in place at mouth of Rock Creek
View of water suppression for tank cooling
View of fire; Friday night 6/3/2016
View looking West after re-rail.
View looking west. Transload from cars in progress.
View looking West. Car empty and purged.
Cars being moved and righted.
Looking East. Cars on side of rail with ballast.
Mouth of Rock Creek. Protective booms in place.
Looking East. Cars on side following rerail.
Looking West. Trains moving through Mosier.
Looking West. Rail open and train moving through.
Horizontal drilling to run air sparge line beneath the railroad tracks
Installing sparge wells to treat contaminated groundwater
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Department of Environmental Quality
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