Department of Environmental Quality

DEQ Home/ Land Quality/ Environmental Cleanup/ ECSI/ Site Summary

Environmental Cleanup Site Information (ECSI) Database Site Summary Report - Details for Site ID 6115, Mosier UPRR Derailment

This report shows data entered as of October 21, 2021 at 4:36:09 AM

This report contains site details, organized into the following sections: 1) Site Photos (appears only if the site has photos); 2) General Site Information; 3) Site Characteristics; 4) Substance Contamination Information; 5) Investigative, Remedial and Administrative Actions; and 6) Site Environmental Controls (i.e., institutional or engineering controls; appears only if DEQ has applied one or more such controls to the site).  A key to certain acronyms and terms used in the report appears at the bottom of the page.

Note: DEQ may have posted online documents related to this site. If so, they would be available for viewing or downloading on ECSI Summary Page

Go to DEQ's Facility Profiler to see a site map as well is information on what other DEQ programs may be active at this site.

Environmental Cleanup Site Information (ECSI) Database Site Summary Report - Details for Site ID 6115, Mosier UPRR Derailment

Site Photos
Click to View Photo Picture Date Caption Size
View Photo 06/03/2016 View looking West immediately after derail and prior to fire. 295 Kb
View Photo 06/03/2016 View looking West during fire. 208 Kb
View Photo 06/03/2016 View of water suppression for tank cooling 1310 Kb
View Photo 06/03/2016 View of fire; Friday night 6/3/2016 1159 Kb
View Photo 06/04/2016 Rail cars following fire 3190 Kb
View Photo 06/04/2016 View west of boom in place at mouth of Rock Creek 1825 Kb
View Photo 06/05/2016 Cars being moved and righted. 3029 Kb
View Photo 06/05/2016 Looking East. Cars on side of rail with ballast. 3983 Kb
View Photo 06/05/2016 Mouth of Rock Creek. Protective booms in place. 3962 Kb
View Photo 06/05/2016 Looking East. Cars on side following rerail. 3045 Kb
View Photo 06/06/2016 Looking West. Trains moving through Mosier. 2613 Kb
View Photo 06/07/2016 Looking West. Rail open and train moving through. 254 Kb
View Photo 06/07/2016 View looking West after re-rail. 1096 Kb
View Photo 06/07/2016 View looking west. Transload from cars in progress. 862 Kb
View Photo 06/07/2016 View looking West. Car empty and purged. 612 Kb
View Photo 07/28/2016 Installing sparge wells to treat contaminated groundwater 168 Kb
View Photo 08/29/2016 Horizontal drilling to run air sparge line beneath the railroad tracks 4282 Kb

General Site Information

Site ID: 6115 Site Name: Mosier UPRR Derailment CERCLIS No:
Address: Near Rock Creek Rd. Mosier 97040
  County: Wasco Region: Eastern
Other location information:
Investigation Status: Suspect site requiring further investigation
Brownfield Site: No NPL Site: No Orphan Site: No Study Area: No
Property: Twnshp/Range/Sect: 2N , 11E , 6 Tax Lots:
  Latitude: 45.6849 deg. Longitude: -121.4022 deg.  Site Size:
Other Site Names:
  OERS 2016-1305

Site Characteristics

General Site Description:
Site History:
Contamination Information:
Manner and Time of Release:
Hazardous Substances/Waste Types:
Environmental/Health Threats:
Status of Investigative or Remedial Action: Investigation and cleanup work through Sept. 9, 2016 is summarized in the attached report by Union Pacific Railroad's consultant, CH2M. That report is attached. Following excavation and offsite disposal of 2,960 tons of petroleum-contaminated soil, two groundwater extraction wells were installed at the crash site and four groundwater monitoring wells were installed north of the railroad tracks. No free product was encountered. However, dissolved-phase petroleum was observed in well MW-4 and in the two extraction wells. CH2M installed a biosparge system to treat groundwater in these two areas.

The status of the investigation and cleanup is summarized in quarterly reports from UPRR's consultant. The most recent of these are attached.

(Aug 20, 2019) DEQ approved a temporary shutdown of the treatment system following more than two and a half years of operation. On March 10, 2019, the biosparge system was turned off. Groundwater was tested on May 2, 2019 and on June 6-7, 2019 to see whether contaminant concentrations would increase as a result of shutdown of this system. These results indicate that contaminant concentrations remain below levels of concern. DEQ therefore plans to notify UPRR that it may decommission the biosparge system and the groundwater monitoring wells.

(Dec. 27, 2019) DEQ oversaw removal of the site's biosparge system and groundwater monitoring wells during the week of November 18, 2019. Environmental cleanup has been completed. UPRR continues to work with the City of Mosier to complete other site restoration activities.
Data Sources:

Substance Contamination Information

Substance Media Contaminated Concentration Level Date Recorded
No information is available

Investigative, Remedial and Administrative Actions

Action Start Date Compl. Date Resp. Staff Lead Pgm
CONFIRMATION SAMPLING  (Primary Action) 06/08/2016   Robert Schwarz ERP
View Full Report Showing Action History

Key to Certain Acronyms and Terms in this Report:

You may be able to obtain more information about this site by contacting Robert Schwarz at the Eastern regional office or via email at If this does not work, you may contact Ximena Cruz Cuevas (503) 229-6811, or via email at or contact the Eastern regional office.