A.70 Sullivan's Ledge, MA

A.70.1 Summary

Environment:	Brackish marsh areas
Scale:
Contaminants of Concern:	PCBs, PAHs
Final Remedy:	Removed sediment with backhoes and long reach excavators and trucked dredged material to treatment pad on site for stabilization. This included an addition of 20% lime kiln dust by volume and up to 10% sand by volume then mixed. Contaminated material was capped on site.

A.70.2 Site Description

Year: 2001

Estimated debris content of 40-80% in OU 1.

OU 2 wetlands are within a 25- and 100- year floodplain of unnamed stream.

Actual Volume Removed: 35,200 yd³ in OU 1 and OU 2

A.70.3 Remedial Objectives

15 mg/kg total PCBs

Contaminated sediment area:

OU 1: 12 acres of disposal area, unnamed stream, and 2 golf course water hazards

OU 2: 7 acres of wetland

A.70.4 Remedial Approach

Backhoes and long-reach excavators were used for dredging.

A.70.5 Monitoring

Resuspension:

Silt fencing was used for erosion control. Air monitoring to ensure no suspension of contaminants.

Performance: Goals were not met.

Residuals:

The sediment cleanup criterion was determined to be impractical following review of initial confirmation sample results.

A.70.6 References

New England Environmental, Inc. 10-Acre Wetland Restoration Sullivan’s Ledge Superfund Site New Bedford MA. http://www.neeinc.com/projects/ecological-restoration/sullivans-ledge-superfund-site/.

USEPA. Five-Year Review Report for Sullivan’s Ledge Superfund Site. Sep 2003. http://www.epa.gov/superfund/sites/fiveyear/f03-01009.pdf.

USEPA. Second Five-Year Review Report for Sullivan’s Ledge Superfund Site. Sep 2008. http://www.epa.gov/superfund/sites/fiveyear/f2008010002480.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