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Contaminated Sediments Program

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This project was made possible by a grant from U.S. EPA's Great Lakes National Program Office with matching funds from the Maumee RAP and members of TMACOG. Any reference to a trademark name or organization does not represent an endorsement by the United States Environmental Protection Agency (USEPA), the Ohio Environmental Protection Agency (OEPA), or the City of Toledo.

Kurt Erichsen, P.E.
TMACOG
Vice President of Environmental
   Planning
P.O. Box 9508
Toledo, OH 43697-9508   

Additional information regarding this project, contact:
Demaree Collier
Environmental Scientist
Great Lakes National Program
    Office

Ecological Screening-Level Risk Assessment of the Lower Ottawa River

Prepared for:
U.S. Environmental Protection Agency
Great Lakes National Program Office
77 W. Jackson Boulevard (G-17J)
Chicago, Illinois  60604

and
Limno-Tech, Inc.
501 Avis Drive
Ann Arbor, Michigan 48108

Prepared by:
Parametrix
5808 Lake Washington Blvd. NE, Suite 200
Kirkland, WA 98033-7350

The Ottawa River Risk Assessment project was started in late 1999 as a partnership between Toledo Metropolitan Area Council of Governments (TMACOG), Ohio EPA, and the Maumee RAP. It was completed in November 2001. Since 1987 when the RAP was established, businesses and governmental agencies have invested millions of dollars to identify and remediate sources of pollution going into the Ottawa River in Toledo. With those sources removed, the next step in restoration of the river is with the sediments.

The project was administered by TMACOG in conjunction with other agencies of the Ottawa River Remediation Team (ORRT). These include Ohio EPA, Ohio Department of Health, US Fish & Wildlife Service, and the City of Toledo. This team, through a competitive process, selected Limno Tech Inc of Ann Arbor as its prime contractor to prepare the Risk Assessments. Limno Tech in turn subcontracted the Human Health Assessment to Intertox and the Ecologic Risk Assessment to Parametrix.

An ecological screening-level risk assessment (SLRA) of the lower Ottawa River was conducted as an initial effort to prioritize chemical hot spots for possible remediation. The SLRA followed the U.S. EPA’s standard ecological risk assessment guidelines and included the following sections:

  1. Problem Formulation;
  2. Exposure Characterization;
  3. Effects Characterization; and
  4. Risk Characterization.

 

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Ottawa River Final Human Health Risk Assessment Report  (PDF 935Kb, 238 pages)
Ottawa River Final Screening-Level Risk Assessment Report (PDF 2.51Mb, 93 pages)
Figure D-1 Lead Concentrations in Sediment: June 2000 Data Compared to Threshold and Probable Effects Levels (PDF 551Kkb, 1 page)
Figure D-2 PCB Concentrations in Sediment: June 2000 Data Compared to Threshold and Probable Effects Levels (PDF 555kb, 1 page)
Figure D-3 Total PAH's in Sediment (PDF 543kb,  1 page)
Figure D-4a River Mile 0-3.2 Lead Concentrations in Sediment: 1998 Data Compared to Threshold and Probable Effects Levels (PDF 582kb, 1 page)
Figure D-4b River Mile 3.2-4.9 Lead Concentrations in Sediment: 1998 Data Compared to Threshold and Probable Effects Levels (PDF 543kb, 1 page)
Figure D-4c River Mile 4.9-6.5 Lead Concentrations in Sediment: 1998 Data Compared to Threshold and Probable Effects Levels (PDF 5570kb, 1 page)
Figure D-4d River Mile 6.5-8.8 Lead Concentrations in Sediment: 1998 Data Compared to Threshold and Probable Effects Levels (PDF 562kb, 1 page)
Figure D-5a River Mile 0-3.2 PCB Concentrations in Sediment:  1998 Data Compared to Threshold and Probable Effects Levels (PDF 585kb, 1 page)
Figure D-5b River Mile 3.2-4.9 PCB Concentrations in Sediment:  1998 Data Compared to Threshold and Probable Effects Levels (PDF 572kb, 1 page)
Figure D-5c River Mile 4.9-6.5 PCB Concentrations in Sediment:  1998 Data Compared to Threshold and Probable Effects Levels (PDF 571kb, 1 page)
Figure D-5d River Mile 6.5-8.8 PCB Concentrations in Sediment:  1998 Data Compared to Threshold and Probable Effects Levels (PDF 573kb, 1 page)
Figure D-6a River Mile 0-3.2 Total PAH's in Sediment: 1998 Data Compared to Sediment Quality Guidelines (PDF 578Kb, 1 page)
Figure D-6b River Mile 3.2-4.9 Total PAH's in Sediment: 1998 Data Compared to Sediment Quality Guidelines (PDF 535kb, 1 page)
Figure D-6c River Mile 4.9-6.5 Total PAH's in Sediment: 1998 Data Compared to Sediment Quality Guidelines (PDF 564kb, 1 page)
Figure D-6d River Mile 6.5-8.8 Total PAH's in Sediment: 1998 Data Compared to Sediment Quality Guidelines (PDF 554kb, 1 page)
Figure E-3 Lead and PCB Concentrations in Sediment: June 2000 Data Compared to Threshold and Probable Effects Levels (PDF 584kb, 1 page)
Table A-1a Summary Statistics for Measured Chemical Concentrations in Fish (Data from Inventory 20 [2000]) (PDF 82kb, 5 pages)
Table A-1b Summary Statistics for Measured Chemical Concentrations in Fish, Whole Organism, from Maumee Bay (Data from Inventory 13 [1999]) (PDF 75kb, 1 page)
Table A-2a Summary Statistics for Measured Chemical Concentrations in Sediment (Data from Inventory 15 [1998]) (PDF 84kb, 5 pages)
Table A-2b Summary Results for Measured Chemical Concentrations in Sediment (Data from Inventory 20 [2000]) (PDF 95kb, 8 pages)
Table A-3 Summary Statistics for Measured Chemical Concentrations in Surface Water (Data from Inventory 20 [2000]) (PDF 90kb, 8 pages)
Table A-4 Chemical Concentrations in Invertebrate Tissues Estimated from Measured Sediment Concentrations (PDF 82kb, 2 pages)
Table B-1 Acute Toxicity Screening Doses for Wildlife  (PDF 84kb, 3 pages)
Table B-2 Chronic Toxicity Screening Doses for Wildlife (PDF 83kb, 3 pages)
Table B-3 Acute and Chronic Surface Water Toxicity Screening Values for Aquatic Life (PDF 82kb, 2 pages)
Table B-4 Sediment Toxicity Screening Values for Aquatic Life (PDF 79kb, 2 pages)
Table B-5 Residue-Based Tissue Toxicity Screening Values for Fish (PDF 78kb, 1 page)
Table C-1 Acute Hazard Quotients for Wildlife Receptors in the Lower Ottawa River (PDF 90kb, 12 pages)
Table C-2 Chronic Hazard Quotients for Wildlife Receptors in the Lower Ottawa River (PDF 91kb, 12 pages)
Table C-3 Acute and Chronic Hazard Quotients for Bald Eagles Feeding on Fish Species in Maumee Bay (PDF 74kb, 1 page)
Table C-4 Acute and Chronic Hazard Quotients for Aquatic Life Based on Surface Water Exposures (PDF 85kb, 4 pages)
Table C-5 Hazard Quotients for Aquatic Life Based on Sediment Exposures (Data from Inventory 15 [1998]) (PDF 105kb, 14 pages)
Table C-6 Hazard Quotients for Aquatic Life Based on Sediment Exposures (Data from Inventory 20 [2000]) (PDF 103kb, 12 pages)
Table C-7 Tissue Residue-Based Hazard Quotients for Aquatic Life (PDF 72kb, 1 page)
   

 


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