Kokomo and Wildcat Creeks, IN

A.31 Kokomo and Wildcat Creeks, IN

A.31.1 Summary

Environment:	Freshwater
Scale:	Full
Contaminants of Concern:	PCBs averaged <10 times the criteria, PAHs detected up to 10 times the criteria, Arsenic detected 3–10 times criteria, Beryllium up to 10 times the criteria.
Final Remedy:	Coarse material gravity dewatered; fines dewatered by solidificationTo make solid, compact, or hard, to make strong or united, or to become solid or united.. On-site lined dewatering pads, water treated on site using sand and granular AC before release to river. 51,000 yd³ of material landfilled; treated off-site if necessary for metals and PCBs; disposed in CAMU; ESD 2005–Creek solids (PCB and VOC) disposed off-site at existing permitted facility.

A.31.2 Site Description

Continental Steel property, OU 3 at Kokomo and Wildcat Creeks, IN

Year: 2007

Water Depth: 1-4 ft

Target Volume:

Kokomo Creek: 7,760 yd³
Wildcat Creek: 8,240 yd³
Total: 16,000 yd³

Actual Volume Removed: 22,467.12 tons

A.31.3 Remedial Objectives

Remove contaminated sediment within the 2 mile stretch of the creek. Contaminated sediment thickness ranges from 0.4 to 2.17 ft.

A.31.4 Remedial Approach

Kokomo Creek was dewatered, so resuspensionA renewed suspension of insoluble particles after they have been precipitated. was not an issue. Dry excavation was completed with conventional earth moving equipment. Hydraulic dredging was completed with a suction vacuum dredge. The amount of water flowing through Wildcat Creek made mechanical dredging difficult, so sediment in Wildcat creek was drawn out with a vacuum.

At Wildcat Creek turbidity monitoring was conducted using sediment trap placement and sampling. Data showed very little resuspension of contaminated sediments

A.31.5 Monitoring

SWAC immediately after dredging:

PCBs: 3 ppm
PAHs: 7 ppm
Arsenic: 19 ppm
Beryllium: 0.840 ppm

Concentrations are lower than pre-dredging.

MNR is being used to ensure the creeks remain at a safe level of contaminants.

A.31.6 References

USEPA Superfund Record of Decision: Continental Steel Corp. USEPA ID: IND001213503. Sep 1998. http://www.epa.gov/superfund/sites/rods/fulltext/r0598091.pdf.

USEPA Superfund Explanation of Significant Differences: Continental Steel Corp. USEPA ID: IND001213503. Sep 2005. http://www.epa.gov/superfund/sites/rods/fulltext/e0505037.pdf.

Indiana Department of Environmental Management. First Five-Year Review Report for Continental Steel Superfund Site City of Kokomo. Jul 2002. http://www.epa.gov/superfund/sites/fiveyear/f02-05013.pdf.

Indiana Department of Environmental Management. Second Five Year Review Report for Continental Steel Superfund Site City of Kokomo. Sep 2007. http://www.epa.gov/superfund/sites/fiveyear/f2007050001940.pdf.

Publication Date: August 2014

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