A.20 Grand Calumet, IN 2007

A.20.1 Summary

Environment:	Freshwater
Scale:	Full
Contaminants of Concern:	PCBs: excessive amount of non-native sediment after 2003 dredging (≥50 ppm)
Final Remedy:	Dredging non-native sediment. Sediment was disposed at an on-site landfill.

A.20.2 Site Description

Year: 2007

Water Depth: 0–4 ft

Target Volume: 24,000 yd³

Actual Volume Removed: 38,000 yd³

Contaminated sediment area: 6,300 ft stretch of river

A.20.3 Remedial Objectives

• Remove nonnative sediment.
• Address PCBs over 50 ppm in areas that still remain from 2003 event.

A.20.4 Remedial Approach

The original site work was completed 2003. PCB levels above 50 ppm goal prompted this second event. Follow-up work consisted of dredging of nonnative sediment. Sediment was disposed of at an on-site landfill.

A.20.5 Monitoring

Sediment sampling done after dredging confirms that concentrations were below 50 ppm PCB.

RAOs/project objectives achieved? After the second dredging event, samples confirmed that all levels were below 50 ppm, and the goal was met.

A.20.6 References

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

Publication Date: August 2014