fox river cleanup operable units 2 - 5. fox river cleanup total river 39 miles long, ou 2 – 5 is...
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![Page 1: 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](https://reader036.vdocuments.mx/reader036/viewer/2022062803/56649c925503460f9494df96/html5/thumbnails/1.jpg)
Fox River Cleanup Operable Units 2 - 5
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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)
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Green Bay, Wisconsin
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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
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Fox River
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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
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Fox River Cleanup
One 12” Hydraulic Dredge, Two 8” Hydraulic DredgesDirect Feed to the Processing Plant (from 10 boosters over 10 miles of HDPE pipeline)
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Processing Facility
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Fox River Cleanup
1. Oversize Separation
2. Slurry Thickening
3. Sand Separation
4. Dewatering
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Sand Separation
• Sand Separation for Beneficial Re-use• Two Sizes of Sand are separated
1. Fine sand (< 63-150um)
2. Coarse sand (150um – 6mm)
• Three Steps:
1. Hydro Cyclones
2. Upstream Classifiers
3. Dewatering Screens
• Sand meets Residential Standards
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Fox River Cleanup
1. Polymer Dosing
2. Pre-Thickening
3. Buffer Tank
4. Mechanical Dewatering
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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
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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
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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
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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