East Multnomah County Groundwater Cleanup Sites

Environmental Cleanup Site Information Number (ECSI):   1479, 635, 13
County:  Multnomah
City:  Portland
Region: Northwest  

Contact Information

Project Manager:  Robert Williams
Phone: 503-229-6802
E-mail: 

Site Summary

Groundwater within the Troutdale Sandstone Aquifer in East Multnomah County (ECSI #1479) has been contaminated with industrial solvents that leaked or spilled into the aquifer from the Cascade Corporation (ECSI #635) and Boeing properties (ECSI #13). The contaminated portion of the Troutdale Sandstone Aquifer lies within the eastern part of the City of Portland South Shore Well Field near Gresham Oregon. Originally, the solvents entered shallow groundwater of the Troutdale Gravel Aquifer beneath both properties, then migrated downward and offsite into the Troutdale Sandstone Aquifer. Since DEQ selected remedies for these aquifers in 1996 and 1997, Boeing and Cascade have been working to cleanup groundwater in the Troutdale Gravel Aquifer on their properties and jointly cleanup groundwater in the Troutdale Sandstone Aquifer. More recently, Boeing and Cascade have begun to closely evaluate cleanup progress and to implement additional cleanup measures to accelerate achieving their cleanup goals. [More...]

Current Documents and Supporting Information

All documents are in PDF format unless otherwise noted.

East Multnomah County

• Semiannual Performance Report, October 1, 2009 through March 31, 2010, Troutdale Sandstone Aquifer Remedy
  Prowell Environmental and Landau Associates, May 28, 2010

Cascade Corporation

• Fact sheet: Cascade Corporation Troutdale Gravel Aquifer Cleanup Progress Update, March 2011
• 2010 Year-End Semiannual Performance Report, Troutdale Gravel Aquifer
  Reporting period July through December 2010
• Updated Cascade Corporation TGA Remedy Pre-Closure Plan
  Letter from Prowell Environmental for Cascade Corporation dated July 26, 2010

The Boeing Company

• 2010 Progress and Performance Evaluation Troutdale Gravel Aquifer, Boeing Portland Facility, Gresham, Oregon
  Landau Associates, March 11, 2011
• Draft Remedy Completion Strategy Plan, Troutdale Gravel Aquifer, Portland, Oregon
  Landau Associates, March 31, 2010.
• Report, Remedial Cleanup Action Building 85-001 Expansion, Boeing Portland, Gresham, Oregon
  Landau Associates, July 6, 2010
• Environmental Subsurface Investigation Building 85-001 Former Degreaser Area, Boeing Portland Facility, Portland, Oregon
  Landau Associates, July 22, 2010

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