A.19 Grand Calumet, IN, 2003

A.19.1 Summary

Environment:	Freshwater
Scale:	Full
Contaminants of Concern:	PAHs, PCBs: average of 17 ppm (max of 350 ppm) prior to dredging, metals, cyanide
Final Remedy:	Sheet piling used to stabilize banks. Cofferdams were used to contain dredging areas over 50 ppm. Sediment deposited at an on-site 36-acre CAMU.

A.19.2 Site Description

Year: 2003

Water depth: 0–4 ft

Target volume: 750,000 yd³

Actual volume removed: 788,000 yd³

Contaminated sediment area: Five-mile stretch of river

A.19.3 Remedial Objectives

• Remove nonnative sediment.

• PCBs: 50 ppm in certain transects

Dredge depth: 0–20 ft

A.19.4 Remedial Approach

The remedial approach consisted of dredging of nonnative sediment. Sediment was disposed of at an on-site landfill.

PCB levels above 50 ppm goal prompted a second remedial event.

A.19.5 Monitoring

A floating debris boom, oil boom, and turbidity curtain were maintained 2,000–3,000 ft downstream of dredge to monitor resuspensionA renewed suspension of insoluble particles after they have been precipitated..

RAOs/project objectives achieved? Immediate goals were met, but samples showed increases as time passed. In 2007, USEPA requested further dredging in areas where samples indicated PCB concentrations greater than 50 ppm.

A.19.6 References

U.S. Steel Gary Works. Grand Calumet River Sediment Remediation Project. Grand Calumet River Sediment Remediation Project Newsletter, GCR Issue 2. May 2003. http://www.csu.edu/cerc/documents/GrandCalumetRiverDredgingPlanMap.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