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Fox River Cleanup Operable Units 2 - 5

Fox River Cleanup Operable Units 2 - 5. Fox River Cleanup. Total river 39 miles long, OU 2 – 5 is about 13 miles PCB contamination Combined Remedy: Prospective dredge volume ~4.0 MM cy Prospective capping area > 500 acres Monitored natural recovery in OUs 2 & 5

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Fox River Cleanup Operable Units 2 - 5

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  1. Fox River Cleanup Operable Units 2 - 5

  2. Fox River Cleanup • Total river 39 miles long, OU 2 – 5 is about 13 miles • PCB contamination • Combined Remedy: • Prospective dredge volume ~4.0 MM cy • Prospective capping area > 500 acres • Monitored natural recovery in OUs 2 & 5 • Estimated remedial action duration = 8 years • Fox River Cleanup Group: • Tetra Tech (Main Contractor) • J.F. Brennan (Marine Contractor) • Stuyvesant E.CO (Processing Contractor)

  3. Green Bay, Wisconsin

  4. Fox River Cleanup • Sediment Characterization • Debris Removal • Cultural Resources • Dredging • Capping & Sand Cover • Sediment Separation • Mechanical Dewatering with Membrane Presses • Water Treatment • Beneficial Re-use & Upland Disposal • Monitored Natural Attenuation

  5. Fox River

  6. Process Plant Design • Plant Designed and Constructed in one year!  effective coordination with Agency Oversight Team • Treatability Tests Performed • Aim is volume reduction by beneficial use (sand separation) and mechanical dewatering • Production Rates 250 in-situ CY per hour or 6500 GPM @ ~ 15% dry solids • 4 dewatering ‘trains’ each with one pre-thickener tank, one buffer tank and 2 membrane plate and frame presses

  7. Fox River Cleanup One 12” Hydraulic Dredge, Two 8” Hydraulic Dredges Direct Feed to the Processing Plant (from 10 boosters over 10 miles of HDPE pipeline)

  8. Processing Facility

  9. Fox River Cleanup Oversize Separation Slurry Thickening Sand Separation Dewatering

  10. Sand Separation • Sand Separation for Beneficial Re-use • Two Sizes of Sand are separated • Fine sand (< 63-150um) • Coarse sand (150um – 6mm) • Three Steps: • Hydro Cyclones • Upstream Classifiers • Dewatering Screens • Sand meets Residential Standards

  11. Fox River Cleanup Polymer Dosing Pre-Thickening Buffer Tank Mechanical Dewatering

  12. Membrane Plate & Frame Presses 3 steps: filling chambers, pressing, discharging filter cake Production: 8 - 12 Ton/hr (Dry Solid / Press) 188 Plates of 2 by 2 meters, automated cleaning system

  13. Transport and Disposal • Average ~ 53% DS dewatered filter cake • TSCA / Non TSCA pre-determined • Truck Scales at the processing Facility • Truck Wash • Focus on Safe Transport to the Landfill

  14. Evaluation of Performance • First Season: May 2009 – November 2009 • 460,000 CY planned to be processed in first season • Actual processed: 541,000 CY • ~ 30% sand recovered, all meeting residential standards • No lost time injuries • Second Season (2010): Currently over 500,000 CY • Incorporated “lessons learned” from first season as part of “Adaptive Management” • Value Engineering = Shared Savings

  15. Boskalis Dolman bv P.O. Box 76 3350 AB Papendrecht The Netherlands www.boskalisdolman.com Stuyvesant Environmental Contracting Inc 3525 N. Causeway Blvd – Suite 612 Metairie, LA 70002 United States of America www.stuyvesantenvironmental.com

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