Project Chief
Mike Sweat
Statewide Water Resources Monitoring
Protection of Drinking Water Sources
Effects of Land Use on Water Quality
Restoring Natural Flow Regimes
Water Availability
Great Lakes Issues
Research and Technical Assistance at Contaminated Sites
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Arial photograph of Grassy Island (28 KB)
Grassy Island was used as a confined disposal facility (CDF) for sediment dredged from the Rouge River between 1961 and 1983. As the first CDF constructed on the Detroit River, it lacks the confinement technology required in more recent CDFs. In 1961, the island became part of the Wyandotte National Wildlife Refuge because of the large population of migratory waterfowl that feed on wild celery in the shoals near the western and southern shores.
This recently-completed study, done in cooperation with US Fish and Wildlife Service investigated the sediments and ground water on the island, which previous studies found to contain concentrations of metals and organic compounds that exceed USEPA limits.
Links to Other Resources:
Investigation of Sediment and Water Chemistry at Grassy Island, Shiawassee National Wildlife Refuge, Wyandotte Unit, Wyandotte Michigan, 1998
Ecological Restoration of Grassy Island and the Wyandotte National Wildlife Refuge in the Detroit River
Sweat, M.J., 1999, Contaminant Distribution in Sediments and Ground Water on and near Grassy Island: FWS Administrative Report, 70 p.
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Table 1. Trace metals, semivolatile and volatile organic compounds,
and pesticides for which laboratory analyses were made in samples
from Grassy Island.
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Table 2. Sample site name, location, and types of samples collected
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Table 3. Lithologic description of bore holes and depths at which
samples were collected
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Table 4. Results of analyses for metals in sediments, Grassy Island.
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Table 5. Results of analyses for semivolatile organic compounds in
sediments, Grassy Island.
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Table 6. Results of analyses for volatile organic compounds in sediments,
Grassy Island.
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Table 7. Results of analyses for pesticides and aroclors (PCBs) in
sediments, Grassy Island.
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Table 8. Results of analyses for metals in water, Grassy Island.
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Table 9. Results of analyses for semivolatile organic compounds in
water, Grassy Island.
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Table 10. Results of analyses for volatile organic compounds in water,
Grassy Island.
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Table 11. Results of analyses for pesticides and aroclors (PCBs) in
water, Grassy Island.
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