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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.

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Presentation on theme: "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."— Presentation transcript:

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 ~ 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 1.Oversize Separation 2.Slurry Thickening 3.Sand Separation 4.Dewatering

10 Sand Separation Sand Separation for Beneficial Re-use Two Sizes of Sand are separated 1.Fine sand (< um) 2.Coarse sand (150um – 6mm) Three Steps: 1.Hydro Cyclones 2.Upstream Classifiers 3.Dewatering Screens Sand meets Residential Standards

11 Fox River Cleanup 1.Polymer Dosing 2.Pre-Thickening 3.Buffer Tank 4.Mechanical Dewatering

12 Membrane Plate & Frame Presses 3 steps: filling chambers, pressing, discharging filter cake Production: 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 ,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 AB Papendrecht The Netherlands Stuyvesant Environmental Contracting Inc 3525 N. Causeway Blvd – Suite 612 Metairie, LA United States of America


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