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Hazardous Waste Cleanup: Ansul Inc. Stanton St. Facility - Marinette, Wisconsin

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Ansul Inc. is currently conducting corrective actions under a 2009 Administrative Order on Consent with the US EPA. The Order requires Tyco to implement institutional controls, soil remediation, sediment removal from the Menominee River, and on-site groundwater management.

    Cleanup Status

    Many parts of the remedy required by the 2009 Order were completed by Tyco. The facility used soil covers to prevent exposures where on-site soils exceed 32 mg/kg total arsenic. Off-site soils were corrected to or below 16 mg/kg total arsenic.  Tyco also removed, treated, and properly disposed of 300,000 cubic yards of soft sediment and semi-consolidated materials above 20 mg/kg total arsenic from the Menominee River.  Tyco installed a barrier made of sheet pile and a slurry wall around the entire facility border to contain arsenic-polluted groundwater on-site.

    Tyco is minimizing the chances for sediment re-contamination in the River. They are re-lining, replacing, or removing parts of their storm water sewer and industrial sewer systems to prevent groundwater penetration into the outfall system.  In two areas of the Site, the former Salt Vault and the 8th Street Slip, Tyco is pumping groundwater levels below the height of the Menominee River to prevent groundwater leaking through the containment wall.  As part of long-term monitoring,

    • Tyco regularly determines the condition of the perimeter containment walls,
    • Will test for leaks through the containment wall in the Main Plant with a dye injection test, and
    • Will re-sample sediments in the Menominee River to show that the remedy is effective.

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      Site Description

      The Ansul facility is an active manufacturing plant in Marinette, located in northeastern Wisconsin along the south shore of the Menominee River. The property is bordered

      • The Menominee river to the north;
      • The Sixth Street Slip and city of Marinette property to the east;
      • Water Street, city of Marinette property, the Marinette School District property; 
      • Residences to the south and Stanton street and Marinette Marine Corp. to the west.

      The facility sits on 63 acres and includes the manufacturing area on the western portion of the property which is undergoing arsenic remediation by Ansul Inc. with oversight of the remediation by the EPA.  

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      Contaminants at this Facility

      Arsenic and volatile organic compounds (VOCs) have been identified in groundwater monitoring wells at the Site.

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      Institutional and Engineering Controls at this Facility

      The facility property is surrounded by Vertical Barrier Walls to prevent groundwater from migrating onto or off of the Site.

      There is an enforceable deed restriction on the site to limit future site use to Industrial use only.

      Site access is controlled by fencing and 24-hour site security personnel.

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      Land Reuse Information at this Facility

      The facility maintains its current use and there has been no reuse of the facility property to date.

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      Site Responsiblity at this Facility

      RCRA Corrective Action activities at this facility are being conducted under the direction of EPA Region 5 with assistance from the Wisconsin Department of Natural Resources

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