Jump to main content.

2004 Risk Assessment Workplan

Unilateral Administrative Order for Human Health and Ecological Risk Assessment, August 2004 (PDF, 20pp, 696K)

Human Health and Ecological Risk Assessment Workplan, July 29, 2004

Workplan text (PDF, 162pp, 1.5MB)

1. INTRODUCTION
2. SITE HISTORY AND SETTING
3. SUMMARY OF ENVIRONMENTAL INVESTIGATIONS
4. PATHWAYS EVALUATION
5. ASSESSMENT OF DATA QUALITY AND USABILITY FOR RISK ASSESSMENT
6. HUMAN HEALTH RISK ASSESSMENT
7. ECOLOGICAL RISK ASSESSMENT
8. REFERENCES

APPENDICES

FIGURES

Figure 1-1 Location Map - St. Regis Paper Company Site (PDF, 11" x 17", 1pg, 353K)
Figure 1-2 Facility Layout - St. Regis Paper Company Site (PDF, 11" x 17", 1pg, 353K)
Figure 1-3 Ownership of Selected Parcels - St. Regis Paper Company Site (PDF, 11" x 17", 1pg, 353K)

Figures 2-1 to 2.2 (PDF, 2pp, 36K)

Figure 2-1 St. Regis Paper Company Site - Timeline
Figure 2-2 Cass Lake City Dump and Southwest Area - Timeline (PDF, 11" x 17", 1pg, 353K)

Figure 2-3 Cass Lake Precipitation Record Summary (PDF 1pg, 51K)
Figure 2-4 Shallow Groundwater Elevation Contours (May 2003 data) (PDF, 1pg, 131K)

Figure 3-1 Timeline of Major Investigations - St. Regis Paper Company Site (PDF, 11" x 17", 1pg, 353K)
Figure 3-2 Soil Sample Locations: Former Limits of Operation and City Dump Area (PDF, 11" x 17", 1pg, 353K)
Figure 3-3 Soil Sample Locations: Residential, Wind Depositional, and Grade School Areas (PDF, 11" x 17", 1pg, 353K)
Figure 3-4 Sediment Sampling Locations- 2001 EPA and International Paper Investigation (PDF, 11" x 17", 1pg, 353K)
Figure 3-5 Surface Water Sampling Locations- 2001 EPA and International Paper Investigation (PDF, 11" x 17", 1pg, 353K)
Figure 3-6 Soil, Sediment, and Surface Water Reference Sample Locations (PDF, 11" x 17", 1pg, 353K)
Figure 3-7 Groundwater Monitoring, Extraction, and Residential Well Locations (PDF, 11" x 17", 1pg, 353K)

Figure 4-1 Risk Assessment Areas A and B (PDF, 11" x 17", 1pg, 353K)
Figure 4-2 Pathways Analysis - Area A (PDF, 11" x 17", 1pg, 353K)
Figure 4-3 Pathways Analysis - Area B (PDF, 11" x 17", 1pg, 353K)

Figure 6-1 Human Health Conceptual Site Model for Area A (Former Wood-treating Area and Nearby Residences) (PDF, 11" x 17", 1pg, 353K)
Figure 6-2 Human Health Conceptual Site Model for Area B (Southwest Area, City Dump, and Nearby Surface Water Bodies) (PDF, 11" x 17", 1pg, 353K)

Figure 7-1 EPA Eight-step Ecological Risk Assessment Process for Superfund (PDF, 11" x 17", 1pg, 353K)
Figure 7-2 Ecological Conceptual Site Model for Area A (Former Wood-treating Area and Nearby Residences) (PDF, 11" x 17", 1pg, 353K)
Figure 7-3 Aquatic Food Web and Feeding Guilds for Area B (PDF, 11" x 17", 1pg, 353K)
Figure 7-4 Ecological Conceptual Site Model for Area B (Southwest Area, City Dump, and Nearby Surface Water Bodies) (PDF, 11" x 17", 1pg, 353K)

TABLES

Tables 2-1 to 2-4 (PDF, 8pp, 119K)

Table 2-1 Common Regional Species Potentially Using the Site - Amphibians and Reptiles
Table 2-2 Fish Species Found in Cass Lake and Pike Bay
Table 2-3 Common Regional Species Potentially Using the Site - Birds
Table 2-4 Common Regional Species Potentially Using the Site - Mammals

Tables 6-1 to 6-8 (PDF, 26pp, 107K)

Table 6-1 Selection of Human Health COPCs for Area A Former Operations Area Soil
Table 6-2 Selection of Human Health COPCs for Area A North Storage Area Soil
Table 6-3 Selection of Human Health COPCs for Area A Residential Soil
Table 6-4 Selection of Human Health COPCs for Area B Southwest Area and Former City Dump Soil
Table 6-5 Selection of Human Health COPCs for Area B Sediment
Table 6-6 Selection of Human Health COPCs for Area B Surface Water
Table 6-7 Selection of Human Health COPCs for Area A Groundwater
Table 6-8 Selection of Human Health COPCs for Area B Groundwater

Tables 6-9 to 6-14 (PDF, 7pp, 163K)

Table 6-9 Risk-Based Concentrations for Groundwater Vapor Intrusion to Indoor Air
Table 6-10 Input Parameters for U.S. EPA Vapor Intrusion Spreadsheet, GW-SCREEN-040903.xls
Table 6-11 Chemicals of Potential Concern for Area A
Table 6-12 Chemicals of Potential Concern for Area B
Table 6-13 Potential Current and Future Human Health Receptors, Exposure Routes, and Potentially Contaminated Media of Areas A and B
Table 6-14 World Health Organization Toxicity Equivalency Factors and Relative Potency Factors

Tables 7-1 to 7-24 (PDF, 40pp, 332K)

Table 7-1 Area A Ecological Soil Benchmark Screening for the Former Wood-treating Area and North Storage Area
Table 7-2 Summary of Qualitative Screening of Chemicals and Identification of COPECs for the Former Wood-treating Area and North Storage Area
Table 7-3 Summary of Toxic Effects of COPECs in Soil at the Former Wood-treating Area and North Storage Area
Table 7-4 Summary of Fate and Transport Characteristics for COPECs
in the Terrestrial Habitat at the Former Wood-treating Area and North Storage Area
Table 7-5 Surrogate Wildlife Species Selected by EPA to Derive Ecological Soil Screening Levels
Table 7-6 Ecological Receptors of Concern, Exposure Routes, and Potentially Contaminated Media—Terrestrial Habitat of Areas A and B
Table 7-7 Area B Ecological Soil Benchmark Screening for the Southwest Area and Former City Dump
Table 7-8 Summary of Qualitative Screening and Identification of COPECs in Soil for Area B
Table 7-9 Area B Ecological Sediment Benchmark Screening
Table 7-10 Summary of Qualitative Screening and Identification of COPECs in the Aquatic Habitat of Area B
Table 7-11 Comparison of Area B Sediment Metals Concentrations to Background
Table 7-12 Area B Ecological Surface Water Benchmark Screening
Table 7-13 Summary of Toxic Effects of COPECs in Soil in Area B
Table 7-14 Summary of Toxic Effects of COPECs in Sediments in Area B
Table 7-15 Summary of Fate and Transport Characteristics for COPECs in Terrestrial Habitat of Area B.
Table 7-16 Fate and Transport Characteristics for COPECs in the Aquatic Habitat of Area B
Table 7-17 Feeding Guilds and Trophic Status of Potential Aquatic and Semi-aquatic Receptors in Area B
Table 7-18 Ecological Receptors of Concern, Exposure Routes, and Potentially Contaminated Media - Aquatic Habitat of Area B
Table 7-19 Assessment and Measurement Endpoints for the Terrestrial Habitat of Areas A and B
Table 7-20 Reference Body Weights and Intake Rates for Common Laboratory Animals
Table 7-21 Assessment Endpoints and Measures of Effects for the Aquatic Habitat for Area B
Table 7-22 Examples of Conclusions Resulting From Information Provided by the Measures of Effects Associated with the Benthic Community Assessment Endpoint
Table 7-23 Framework for Evaluating the Measures of Effects Associated with Assessment Endpoints for Water Column Organisms
Table 7-24 Framework for Evaluating the Measures of Effects Associated with Assessment Endpoints for Piscivorous Wildlife

Cleanup in Region 5 | EPA Cleanup Home | Search CERCLIS database | Search NPL database

Local Navigation

Jump to main content.