Sediment Dredging at Superfund Megasites ... - Emsus.com
Sediment Dredging at Superfund Megasites ... - Emsus.com
Sediment Dredging at Superfund Megasites ... - Emsus.com
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Range of Experiences <strong>at</strong> <strong>Dredging</strong> ProjectsGrasse River, NY• Removed 24,600 cy in 2005.• Average surficial sediment PCBconcentr<strong>at</strong>ions increased afterdredging from 4.1 mg/kg to 150mg/kg. No cleanup level.• Intended to remove 64,000 cy; Ableto dredge 40% of the targeted area.Capped entire dredged areafollowing remedi<strong>at</strong>ion.• Residuals: Average of 16 in. ofcontamin<strong>at</strong>ed sediments remainedafter dredging (range from 3 to 32in.)• Increased contaminantconcentr<strong>at</strong>ions in fish and w<strong>at</strong>erduring dredgingHead of Hylebos, WA• Removed 404,000 cy from 2004 to2006.• Average surficial sediment PCBconcentr<strong>at</strong>ions decreased afterdredging from 0.69 mg/kg to 0.07mg/kg. Cleanup level: 0.3 mg/kg.• <strong>Sediment</strong>s from targeted areas weresuccessfully dredged. Had to cap onearea due to remaining contamin<strong>at</strong>ion.• Residuals: No summary st<strong>at</strong>istics;Ranged from 0 to >12 in. Residualcontamin<strong>at</strong>ed sediments were belowcleanup level.• No sampling for contaminantconcentr<strong>at</strong>ions in w<strong>at</strong>er and in fish.15
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