A.15 Fox River and Green Bay, WI 2009

A.15.1 Summary

Environment:	Freshwater
Scale:	Full
Contaminants of Concern:	PCBs, max 222 ppm, dioxin, furan, DDT, heavy metals
Final Remedy:	Swinging ladder dredge used. Non-TSCA sediments taken to Onyx Hickory Meadows Landfill (27 miles).

A.15.2 Site Description

Year: 2009

Water depth: 6–20 ft

Target volume: 748,200 yd³

Actual volume removed: approximately 500,000 yd³

Contaminated sediment depth: 1–6 ft

Contaminated sediment area: 39 miles

A.15.3 Remedial Objectives

• PCBs: 1.0 ppm
• SWAC of 0.25 ppm PCBs in the upper 10 cm of sediment

A.15.4 Remedial Approach

A swinging ladder dredge was used. Another 245,000 yd³ were capped. Silt curtains were placed at both the spreader bay and discharge line to control suspended solids.

A.15.5 Monitoring

Post dredging average PCB concentration were 0.23 ppm. A six-inch sand capA covering over material (contaminated sediment) used to isolate the contaminants from the surrounding environment. was placed on areas where 1.0 ppm of PCBs were not reached.

RAOs/project objectives achieved? Yes.

A.15.6 References

Final Basis of Design Report Lower Fox River and Green Bay Site Volume I. Jun 2006. http://foxrivercleanup.com/bmos-resources/basisofdesignreportvolume1.pdf.

Record of Decision Operable Unit 1 and Operable Unit 2 Lower Fox River and Green Bay, Wisconsin Record of Decision Responsiveness Summary. Dec 2002. http://foxrivercleanup.com/bmos-resources/rod1.pdf.

Record of Decision Amendment Operable Unit 2 (Deposit DD), Operable Unit 3, Operable Unit 4, and Operable Unit 5 (River Mouth) Lower Fox River and Green Bay Superfund Site. June 2007. http://foxrivercleanup.com/bmos-resources/amendedrod.pdf.

U.S. EPA. First Five-Year Review Report for Fox River NRDA/PCB Releases Site. July 2009. http://www.epa.gov/superfund/sites/fiveyear/f2009050002959.pdf.

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

Publication Date: August 2014