A.11 East Doane Lake, Port of Portland, OR

A.11.1 Summary

Environment:	Freshwater
Scale:	Field
Contaminants of Concern:	Lead, dioxin
Final Remedy:	Debris removed, dredging then disposal to an on-site, dedicated RCRA containment cell then deposited in a new on-site landfill, which was constructed in 1999.

A.11.2 Site Description

The East Doane Lake site was owned by Gould Inc. and was contaminated with lead and dioxin. The contaminated sediment area consisted of a 3.1-acre lake remnant.

A.11.3 Remedial Objectives

Removal of contaminated sediment averaging 2 ft deep, with a dredge depth of 1–5 ft.

A.11.4 Remedial Approach

A horizontal auger dredge was used for sediment removal. The lake contained extensive industrial debris, including cables, batteries, gas cylinders, concrete blocks, and tires. Most large items were removed by divers before dredging began. The target removal volume of sediments was 6,000 yd³; the actual volume removed was 11,000 yd³ 

A.11.5 Monitoring

Residuals concentrations were significantly lower after dredging. The lake was backfilled with 95,000 tons of rock.

A.11.6 References

U.S. EPA. Superfund Information Systems Five-Year Reviews Online Gould, Inc. as updated Feb. 2008. http://cumulis.epa.gov/fiveyear/index.cfm?fuseaction=fyrsearch.showSitePage&id=1000455.

Major Contaminated Sediment Sites Database; Sept. 2004 as updated 2008. http://www.smwg.org/MCSS_Database/MCSS_Database_Docs.html.

Publication Date: August 2014