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Region 10 Homepage Region 10 Cleanup Portland Harbor What You Can Do Information Sources Fact Sheets In The News Maps & Photos Technical Documents Uplands Related Links Cleanup Work   Arkema   Gasco - Siltronic   Terminal 4   Triangle Park   Upland Sites   U.S. Moorings Freedom of Information Act (FOIA)

Gasco-Siltronic Gasco is a former manufactured gas plant which deposited wastes into upland tar ponds for many years. The site is located near river mile 6.5 between the St. Johns and Railroad bridges on the southwest side of the Willamette River. The tar ponds overflowed into the Willamette River for decades. The overflow remnants were visible during low river stages and were eroding. Removal tar deposits in the river was completed in the fall of 2005 (brown material in the picture at the right). Proposed Removal Action: Approval Memo (PDF)(20pp. 4.4MB) - September 9, 2009 Settlement Agreement (PDF)(70pp. 577KB) - September 9, 2009 Scope of Work (PDF)(55pp. 370KB) - September 9, 2009 Photo Gallery Technical Documents Final GASCO Oversight Report (PDF)(10pp. 312KB to start) - November 2006 News Archive Sign up for email updates about Northwest Oregon [ Main Cleanup | Brownfields ] [ Superfund | FOIA | Records Center ] Point of contact: Judy Smith E-Mail: smith.judy@epa.gov Phone Number: (503) 326-6994 Last Updated: 09/10/2009