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PUBLIC HEALTH ASSESSMENT

STIBNITE/YELLOW PINE MINING AREA
STIBNITE, VALLEY COUNTY, IDAHO


APPENDIX A: STIBNITE LOCATION AND SAMPLING MAPS

Location Map
Figure 1. Location Map

Privately Owned Parcels within the Stibnite Site
Figure 2. Privately Owned Parcels within the Stibnite Site

Site Map
Figure 3. Site Map

1997 and 1999 Soil Sample Locations in Meadow Creek Valley and DMEA Dump
Figure 4. 1997 and 1999 Soil Sample Locations in Meadow Creek Valley and DMEA Dump


APPENDIX B: ATSDR INTERIM PUBLIC HEALTH HAZARD CATEGORIES

Table B-1.

Interim Public Health Hazard Categories
CATEGORY/DEFINITION DATA SUFFICIENCY CRITERIA
Urgent Public Health Hazard
This category is used for sites where short-term exposures (<1yr) to hazardous substances or conditions could result in adverse health effects that require rapid intervention.
This determination represents a professional judgment based on critical data, which ATSDR has judged sufficient to support a decision. This does not necessarily imply that the available data are complete; in some cases additional data may be required to confirm or further support the decision made. Evaluation of available relevant information* indicated that site-specific conditions or likely exposures have had, are having, or are likely to have in the future, an adverse impact on human health that requires immediate action or intervention. Such site-specific conditions or exposures may include the pre of serious physical or safety hazards.
Public Health Hazard
This category is used for sites that pose a public health hazard due to the existence of long-term exposure (>1yr) to hazardous substance or conditions that could result in adverse health effects.
This determination represents a professional judgment based on critical data, which ATSDR has judged sufficient to support a decision. This does not necessarily imply that the available data are complete; in some cases additional data may be required to confirm or further support the decision made. Evaluation of available relevant information* suggests that, under site-specific conditions of exposure, long-term exposures to site-specific contaminants (including radionuclides) have had, are having, or are likely to have in the future, an adverse impact on human health that requires one of more public health interventions. Such site-specific exposures may include the presence of serious physical or safety hazards.
Indeterminate Public Health Hazard
This category is used for sites in which "critical" data are insufficient with regard to extent of exposure and/or toxicological properties at estimated exposure levels.
This determination represents a professional judgment that critical data are missing and ATSDR has judged the data are insufficient to support a decision. This does not necessarily imply all data are incomplete; but that some additional data are required to support a decision. The health assessor much determine, using professional judgment, the "criticality" of such data and the likelihood that the data can be obtained and will be obtained in a timely manner. Where some data are available, even limited data, the health assessor is encouraged to the extent possible to select other hazard categories and to support their decision with clear narrative that explains the limits of the data and the rationale for the decision.
No Apparent Public Health Hazard
This category is used for sites where human exposure to contaminantd media may be occurring, may have occurred in the past, and/or may occur in the future, but the exposure is not expected to cause any adverse health effects.
This determination represents a professional judgment based on critical data, which ATSDR considers sufficient to support a decision. This does not necessarily imply that the available data are complete; in some cases additional data may be required to confirm or further support the decision made. Evaluation of available relevant information* indicates that, under site-specific conditions of exposure, exposures, exposure to site-specific contaminants in the past, present, or future are not likely to result in any adverse impact on human health.
No Public Health Hazard
This category is used for sites that, because of the absence of exposure, do NOT pose a public health hazard.
Sufficient evidence indicates that no human exposures to contaminantd media have occurred, none are now occurring, and none are likely to occur in the future.  

*: Such as environmental and demographic data; health outcome data; community health concerns information; toxicological, medical, and epidemiological data; monitoring and management plans


APPENDIX C: CONTAMINANTS OF CONCERN SELECTION AND ESTIMATED NON-CARCINOGENIC EXPOSURE DOSES

Table C-1.

Health Comparison Values/Screening Values
Medium Contaminant Non-cancer Cancer and Other
  Child Adult Source Standards Source
Soil (mg/kg) Aluminum 100000 1000000 I-EMEG -- --
Antimony 20 300 RMEG -- --
Arsenic 20 200 C-EMEG 0.5 CREG
Cadmium 10 100 C-EMEG    
*Chromium III 80000 1000000 RMEG -- --
Copper 2900 RS-PRG -- --
Cyanide 1000 10000 RMEG -- --
Lead 400 RS-PRG -- --
Manganese 3000 40000 RMEG -- --
Mercury 100 1000 I-EMEG -- --
Methyl Mercury 20 200 C-EMEG    
Nickel 1000 10000 RMEG -- --
Selenium 300 4000 C-EMEG -- --
Silver 300 4000 RMEG -- --
Zinc 20000 200000 C-EMEG -- --
Drinking Water (µg/L) Aluminum 20000 70000 I-EMEG -- --
Antimony 4 10 RMEG 6 LTHA
Arsenic 3 10 C-EMEG 0.02 CREG
Cadmium 2 7 C-EMEG    
Chromium III 20000 50000 RMEG -- --
Copper 1400 TW-PRG 1300 MCLG
Cyanide 200 700 RMEG -- --
Lead -- -- MCLG 15 AL
Manganese-w 500 2000 RMEG -- --
Mercury 20 70 I-EMEG -- --
Methyl Mercury 3 10 C-EMEG    
Nickel 200 700 RMEG -- --
Selenium 50 200 C-EMEG -- --
Silver 50 200 RMEG -- --
Zinc 3000 10000 C-EMEG -- --

* Chromium at the site is assumed to be trivalent chromium.
AL: Action Level
C-EMEG: Chronic Environmental Media Evaluation Guide
CREG: Cancer Risk Evaluation Guide for 10-6 excess cancer risk
I-EMEG: Intermidiate Environmental Media Evaluation Guide
LTHA: Lifetime Health Advisory for drinking water (EPA)
MCLG: Maximum Contaminant Level Goal for drinking water (EPA)
RMEG: Reference Dose Media Evaluation Guide
RS-PRG: Residential Soil Preliminary Remediation Goals (USEPA Region IX)
TW-PRG: Tap Water Preliminary Remediation Goals (USEPA Region IX)


Table C-2.

Contaminants of Concern in Surface Soil of Meadow Creek Exposure Areas
Contaminant Site Specific Background
(mg/kg)
Bradley Tailings and Neutralied Ore Disposal Area (RME) Above CVs
(Y/N)
Meadow Creek Mine Hillside (RME) Above CVs
(Y/N)
Lower Meadow Creak Valley (RME) Above CVs
(Y/N)
Upgradient Wetland (MAX) Above CVs
(Y/N)
Keyway Wetland (MAX) Above CVs
(Y/N)
Meadow Creek Forested Wetland (MAX) Above CVs
(Y/N)
Aluminum 9300 5680 N 13300 N 7210 N 43300 N 13000 N 34200 N
Antimony 1.81 133 Y 15.6 N 1320 Y -- N 333 Y 1550 Y
Arsenic 5.68 1620 Y 1460 Y 955 Y 24.4 Y 634 Y 1230 Y
Cadmium <0.1 2.7 N -- N -- N -- N -- N 0.13 N
Chromium 2.92 17.7 N 4.08 N 7.78 N 39.9 N 7.1 N 14.3 N
Copper 3.55 19.3 N 5.63 N 17.4 N 12.1 N 19.6 N 68.8 N
Cyanide -- 1.03 N -- N -- N -- N 0.27 N -- N
Lead 2.72 15.6 N 4.5 N 34.7 N 9.4 N 47.8 N 160 N
Manganese 368 400 N 1580 N 271 N 206 N 233 N 199 N
Mercury <0.1 2.62 N 0.416 N 0.716 N 0.11 N 0.89 N 3.1 N
Nickel 2.01 35.2 N 3.83 N 9.78 N 21 N 5.9 N 8 N
Selenium <0.3 -- N -- N 0.48 N 0.19 N 0.52 N 5.3 N
Silver <0.1 0.81 N 0.149 N 2.52 N 0.1 N 2.8 N 19.6 N
Zinc 25.7 18.1 N 45.3 N 58.2 N 67.7 N 40.9 N 70.9 N

RME = Reasonable Maximum Exposure Concentration (mg/kg)
MAX = Maximum Concentration (mg/kg)
Note: Highlighted concentrations indicate contaminant concentration is above the health-based comparison values


Table C-3.

Contaminants of Concern in Surface Soil of Bradley Waste Rock Dumps and Hot Spots
Contami-nant Site Specific Backg-round
(mg/kg)
Southeast Dump and Midnight Creek (RME) Above CVs
(Y/N)
Glory Hole, Northwest Dump and EFSFSR (RME) Above CVs
(Y/N)
Northeast Dump and Sugar Creek (RME) Above CVs
(Y/N)
Location UW-1 ( Upgradient Wetland) (Max) Above CVs
(Y/N)
Smelter Stack (Max) Above CVs
(Y/N)
DMEA Dump (Max) Above CVs
(Y/N)
Location BD6 (Northwest Dump) (Max) Above CVs
(Y/N)
Aluminum 31567 4740 N 7920 N 11000 N 20200 N 13500 N 4400 N 6850 N
Antimony 11.75 0.7 N 368 Y 19.1 N 689 Y 292 Y 7.4 N 16400 Y
Arsenic 200 4970 Y 2720 Y 5630 Y 983 Y 9420a Y 9460 Y 4790 Y
Cadmium 0.08 -- N -- N -- N -- N 0.09 N -- N 0.09 N
Chromium 25 5.7 N 10.9 N 16.2 N 10.1 N 6.1 N 6.4 N 8.57 N
Copper 9.15 7.27 N 9.49 N 11.1 N 286 N 8.3 N 6.3 N 26.5 N
Cyanide -- -- N -- N -- N -- N -- N -- N -- N
Lead 8.03 11.5 N 6.51 N 8.56 N 754 Y 16.6 N 9.2 N 34.7 N
Manganese 1563 56.1 N 2.53 N 359 N 147 N 370 N 885 N 130 N
Mercury 0.16 2.51 N 1.39 N 1.52 N 2.3 N 471 Y 9.9 N 13.6 N
Nickel 19.9 3.89 N 5.97 N 17.1 N 8.2 N 2.8 N -- N 2.89 N
Selenium <0.3 -- N 0.316 N 0.248 N 1.1 N 66.7 N 0.35 N 7.7 N
Silver 0.09 0.54 N 2.52 N 1.95 N 2.2 N 4.1 N 3.4 N 6.79 N
Zinc 71.9 53.9 N 40.5 N 30 N 48.2 N 47.3 N 42.7 N 150 N

RME = Reasonable Maximum Exposure Concentration (mg/kg)
MAX = Maximum Concentration (mg/kg)
a the arsenic concentration in the surface soil of Smelter Stack (9420 mg/kg) came from USFS confirmation soil sample results (email communication, USFS, Dec. 16, 2002).

Note: Highlighted concentrations indicate contaminant concentration is above the health-based comparison values


Table C-4.

Contaminants of Concern in Surface Water of Different Exposure Locations (mg/L)
Contaminant Lower Meadow Creak Valley (RME) Y/N Upgradient Wetland, (MAX) Y/N Keyway Wetland (MAX) Y/N Southeast Dump and Midnight Creek (RME) Y/N Glory Hole, Northwest Dump and EFSFSR (RME) Y/N Northeast Dump and Sugar Creek (RME) Y/N Location UW-1 (Upgradient Wetland) (Max) Y/N Bailey Tunnel Outlet Y/N
Aluminum 0.0831 N 0.153 N 0.12 N 0.079 N 0.047 N 0.137 N -- N -- N
Antimony 0.0112 Y -- N 0.127 Y 0.0392 Y 0.0267 Y 0.0083 Y 0.069 Y 0.281 Y
Arsenic 0.0323 Y -- N 0.463 Y 0.0577 Y 0.059 Y 0.012 Y 0.316 Y 0.535 Y
Cadmium -- N -- N -- N -- N -- N -- N -- N -- N
Chromium III -- N -- N -- N -- N -- N -- N -- N -- N
Copper 0.002 N 0.0017 N -- N -- N -- N -- N 0.004 N -- N
Cyanide 0.0023 N 0.0021 N 0.0056 N 0.0021 N -- N -- N -- N -- N
Lead 0.00143 N 0.001 N -- N 0.0046 N 0.00032 N -- N 0.0053 N 0.0064 N
Manganese-w 0.0314 N 0.0072 N 0.785 Y 0.0154 N 0.0282 N 0.005 N 0.0491 N 0.181 N
Mercury 0.000054 N -- N 0.000118 N 0.000131 N 0.00039 N 0.000255 N -- N -- N
Nickel -- N -- N -- N -- N 0.0144 N -- N -- N -- N
Selenium -- N -- N -- N -- N -- N -- N -- N -- N
Silver -- N -- N -- N -- N 0.000129 N -- N -- N 0.000106 N
Zinc 0.00252 N -- N 0.0044 N 0.0159 N 0.00385 N 0.008 N -- N 0.0075 N

RME = Reasonable Maximum Exposure Concentration (mg/L)
MAX = Maximum Concentration (mg/L)

Note: Highlighted concentrations indicate contaminant concentration is above the health-based comparison values


Table C-5.

Estimated Daily Exposure Dose of Concerned Contaminants from Consumption of Fish by Recreational Users
Contaminant Lower Meadow Creak Valley (RME) Exposure Dose (mg/kg/d) Southeast Dump and Midnight Creek (RME) Exposure Dose (mg/kg/d) Glory Hole, Northwest Dump and EFSFSR (RME) Exposure Dose (mg/kg/d)
    Children Adult Workers   Children Adult Workers   Children Adult Workers
Aluminum --       --       --      
Antimony --       --       --      
Arsenic 0.0728 5.3E-07 3.2E-07 3.6E-06 0.0728 5.3E-07 3.2E-07 3.6E-06 0.0739 5.4E-07 3.2E-07 3.6E-06
Cadmium --       --       --      
Chromium III --       --       --      
Copper --       --       --      
Cyanide --       --       --      
Lead --       --       0.042 5.1142E-07 3.0685E-07 3.5E-06
Manganese 0.599 7.3E-06 4.4E-06 4.9E-05 0.599 7.3E-06 4.4E-06 4.9E-05 0.353 4.3E-06 2.6E-06 2.9E-05
Mercury --       --       --      
Methyl Mercury 0.218 2.7E-06 1.6E-06 1.8E-05 0.218 2.7E-06 1.6E-06 1.8E-05 0.117 1.4E-06 8.5E-07 9.6E-06
Nickel --       --       --      
Selenium 0.706 8.6E-06 5.2E-06 5.8E-05 0.706 8.6E-06 5.2E-06 5.8E-05 0.615 7.5E-06 4.5E-06 5.1E-05
Silver --       --       --      
Zinc 7.05 8.6E-05 5.2E-05 5.8E-04 7.05 8.6E-05 5.2E-05 5.8E-04 7.83 9.5E-05 5.7E-05 6.4E-04
 

RME = Reasonable Maximum Exposure Concentration (mg/kg)

Note: There is no comparison value available for lead


Table C-6.

Health Guidelines Values
Contaminant ATSDR's Chronic Oral MRL
mg/kg/day
ATSDR's Intermediate Oral MRL
mg/kg/day
ATSDR's Acute Oral MRL
mg/kg/day
EPA's Chronic Oral RfD
mg/kg/day
EPA's Oral Slope Factor
(mg/kg/day)-1
Aluminum   2      
Antimony       0.0004  
Arsenic 0.0003   0.005 0.0003 1.5
Cadmium 0.0002        
Chromium       1.5  
Copper          
Cyanide       0.02  
Lead          
Manganese (environmental)       0.05  
Manganese (food)       0.14  
Mercury   0.002 0.007 0.0003  
Methyl Mercury 0.0003     0.0001  
Nickel       0.02  
Selenium 0.005     0.005  
Silver       0.005  
Zinc 0.3 0.3   0.3  

MRL: Minimal Risk Level
RfD: Reference Dose


Table C-7.

Estimated Daily Exposure Dose (mg/kg/d) of Concerned Contaminants from Ingestion of Surface Soil and Inhalation of Airborne Particulate in Meadow Creek Exposure Areas
Population Contaminant Bradley Tailings and Neutralied Ore Disposal Area (RME) Dose Meadow Creek Mine Hillside (RME) Dose Lower Meadow Creak Valley (RME) Dose Upgradient Wetland (MAX) Dose Keyway Wetland (MAX) Dose Meadow Creek Forested Wetland (MAX) Dose
Children ( 7 years old) Recreational Users Antimony 133 2.6E-05     1320 2.6E-04     333 6.5E-05 1550 3.0E-04
Arsenic 1620 1.9E-04 1460 1.7E-04 955 1.1E-04 24.4 2.9E-06 634 7.4E-05 1230 1.4E-04
Adult Recreational Users Antimony 133 7.8E-06     1320 7.7E-05     333 1.9E-05 1550 9.1E-05
Arsenic 1620 5.7E-05 1460 5.1E-05 955 3.3E-05 24.4 8.6E-07 634 2.2E-05 1230 4.3E-05
Reclamation Workers Antimony 133 8.7 E-05     1320 8.7E-04     333 2.2E-04 1550 1.0E-03
Arsenic 1620 6.4E-04 1460 5.8E-04 955 3.8E-04 24.4 9.6E-06 634 2.5E-04 1230 4.9E-04

Note: Highlighted exposure doses indicate estimated daily contaminant exposure dose is above the ATSDR's Chronic Oral MRL or EPA's Chronic Oral RfD


Table C-8.

Estimated Daily Exposure Dose (mg/kg/d) of Concerned Contaminants from Ingestion of Surface Soil and Inhalation of Airborne Particulate in Bradley Waste Rock Dumps and Hot Spots
Population Contaminant Southeast Dump and Midnight Creek (RME) Dose Glory Hole, Northwest Dump and EFSFSR (RME) Dose Northeast Dump and Sugar Creek (RME) Dose Location UW-1 (Upgradient Wetland) (Max) Dose Smelter Stack (Max) Dose DMEA Dump (Max) Dose Location BD-6 (Northwest Dump)
(Max)
Dose
Children ( 7 years old) Recreational Users Antimony     368 7.2E-05     689 1.7E-05 292 7.1E-06     16400 4.0E-04
Arsenic 4970 5.8E-04 2720 3.2E-04 5630 6.6E-04 983 1.4E-05 9420 1.8E-04 9460 1.5E-04 4790 7.0E-05
Lead             754 1.8E-05            
Mercury                 471 1.1E-05        
Adult Recreational Users Antimony     368 2.2E-05     689 5.0E-06 292 2.1E-06     16400 1.2E-04
Arsenic 4970 1.7E-04 2720 9.5E-05 5630 2.0E-04 983 4.3E-06 9420 5.5E-05 9460 4.1E-05 4790 2.1E-05
Lead             754 5.5E-06            
Mercury                 471 3.4E-06        
Reclamation Workers Antimony     368 2.4E-04     689 7.0E-05 292 3.0E-05     16400 1.7E-03
Arsenic 4970 2.0E-03 2720 1.1E-03 5630 2.2E-03 983 6.0E-05 9420 7.7E-04 9460 5.8E-04 4790 2.9E-04
Lead             754 7.7E-05            
Mercury                 471 4.8E-05        

Note: Highlighted exposure doses indicate estimated daily contaminant exposure dose is above the ATSDR's Chronic Oral MRL or EPA's Chronic Oral RfD. No MRL or RfD available for lead.


Table C-9.

Estimated Daily Exposure Dose (mg/kg/d) of Concerned Contaminants from Ingestion of Surface Water
  Contaminant Lower Meadow Creak Valley (RME) Dose Keyway Wetland (MAX) Dose Southeast Dump and Midnight Creek (RME) Dose Glory Hole, Northwest Dump and EFSFSR (RME) Dose Northeast Dump and Sugar Creek (RME) Dose Location UW-1 (Upgradient Wetland) (Max) Dose Bailey Tunnel Outlet Dose
Children ( 7 years old) Recreational Users Antimony 0.0112 1.1E-05 0.127 1.2E-04 0.0392 3.8E-05 0.0267 2.6E-05 0.0083 8.1E-06 0.069 8.4E-06 0.281 2.7E-04
Arsenic 0.0323 1.9E-05 0.463 2.7E-04 0.0577 3.4E-05 0.059 3.4E-05 0.012 7.0E-06 0.316 2.3E-05 0.535 3.1E-04
Manganese-w     0.785 7.6E-04                    
Adult Recreational Users Antimony 0.0112 6.5E-06 0.127 7.4E-05 0.0392 2.3E-05 0.0267 1.6E-05 0.0083 4.9E-06 0.069 5.0E-06 0.281 1.6E-04
Arsenic 0.0323 1.1E-05 0.463 1.6E-04 0.0577 2.0E-05 0.059 2.1E-05 0.012 4.2E-06 0.316 1.4E-05 0.535 1.9E-04
Manganese-w     0.785 4.6E-04                    

Note: No estimated daily contaminant exposure dose is above the health guidelines values


Table C-10.

Summary of Non-Carcinogenic Exposure Dose of the Concerned Contaminants in Different Areas
Contaminant Exposure Media Area 1 (Bradley Tailings and Naturalized Ore Disposal Area) Area 1 (Meadow Creek Mine Hillside) Lower Meadow Creek Valley
    Recreational Users Reclamation Workers Recreational Users Reclamation Workers Recreational Users Reclamation Workers
    Children Adults Children Adults Children Adults
    Exposure Dose (mg/kg/day) Exposure Dose (mg/kg/day) Exposure Dose (mg/kg/day)
Antimony Surface Soil 2.6E-05 7.8E-06 8.7E-05       2.6E-04 7.7E-05 8.7E-04
Surface Water             1.1E-05 6.5E-06  
Fish                  
Total 2.6E-05 7.8E-06 8.7E-05       2.7E-04 8.4E-05 8.7E-04
Arsenic Surface Soil 1.9E-04 5.7E-05 6.4E-04 1.7E-04 5.1E-05 5.8E-04 1.1E-05 3.3E-05 3.8E-04
Surface Water             1.9E-05 1.1E-05  
Fish             5.3E-07 3.2E-07 3.6E-06
Total 1.9E-04 5.7E-05 6.4E-04 1.7E-04 5.1E-05 5.8E-04 3.1E-04 4.4E-05 3.8E-04

Note: Highlighted exposure doses indicate estimated daily contaminant exposure dose is above the ATSDR's Chronic Oral MRL or EPA's Chronic Oral RfD


Table C-10.

Summary of Non-Carcinogenic Exposure Dose of the Concerned Contaminants in Different Areas
Contaminant Exposure Media Area 1 (Upgradient Wetland, excl. the UW-1 Hot Spot) Area 1 (Keyway Wetland) Area1 (Meadow Creek Forested Wetland)
    Recreational Users Reclamation Workers Recreational Users Reclamation Workers Recreational Users Reclamation Workers
    Children Adults Children Adults Children Adults
    Exposure Dose (mg/kg/day) Exposure Dose (mg/kg/day) Exposure Dose (mg/kg/day)
Antimony Surface Soil       6.5E-05 1.9E-05 2.2E-04 3.0E-04 9.1E-05 1.0E-03
Surface Water       1.2E-04 7.4E-05        
Fish                  
Total       1.9E-04 9.3E-05 2.2E-04 3.0E-04 9.1E-05 1.0E-03
Arsenic Surface Soil 2.9E-06 8.6E-07 9.6E-06 7.4E-05 2.2E-05 2.5E-04 1.4E-04 4.3E-05 4.9E-04
Surface Water       2.7E-04 1.6E-04        
Fish                  
Total 2.9E-06 8.6E-07 9.6E-06 3.4E-04 1.8E-04 2.5E-04 1.4E-04 4.3E-05 4.9E-04

Note: Highlighted exposure doses indicate estimated daily contaminant exposure dose is above the ATSDR's Chronic Oral MRL or EPA's Chronic Oral RfD


Table C-10.

Summary of Non-Carcinogenic Exposure Dose of the Concerned Contaminants in Different Areas
Contaminant Exposure Media Southeast Dump and Midnight Creek) Glory Hole, Northwest Dump and EFSFSR Northeast Dump and Sugar Creek
    Recreational Users Reclamation Workers Recreational Users Reclamation Workers Recreational Users Reclamation Workers
    Children Adults Children Adults Children Adults
    Exposure Dose (mg/kg/day) Exposure Dose (mg/kg/day) Exposure Dose (mg/kg/day)
Antimony Surface Soil       7.2E-05 2.2E-05 2.4E-04      
Surface Water 3.8E-05 2.3E-05   2.6E-05 1.6E-05   8.1E-06 4.9E-06  
Fish                  
Total 3.8E-05 2.3E-05   9.8E-05 3.8E-05 2.4E-04 8.1E-06 4.9E-06  
Arsenic Surface Soil 5.8E-04 1.7E-04 2.0E-03 3.2E-04 9.5E-05 1.1E-03 6.6E-04 2.0E-04 2.2E-03
Surface Water 3.4E-05 2.0E-05   3.4E-05 2.1E-05   7.0E-06 4.2E-06  
Fish 5.3E-07 3.2E-07 3.6E-06 5.4E-07 3.2E-07 3.6E-06      
Total 6.1E-04 1.9E-04 2.0E-03 3.5E-04 1.2E-04 1.1E-03 6.6E-04 2.0E-04 2.2E-03

Note: Highlighted exposure doses indicate estimated daily contaminant exposure dose is above the ATSDR's Chronic Oral MRL or EPA's Chronic Oral RfD


Table C-10.

Summary of Non-Carcinogenic Exposure Dose of the Concerned Contaminants in Different Areas
Contaminant Exposure Media Location UW-1 (Upgradient Wetland) Smelter Stack DMEA Dump
    Recreational Users Reclamation Workers Recreational Users Reclamation Workers Recreational Users Reclamation Workers
    Children Adults Children Adults Children Adults
    Exposure Dose (mg/kg/day) Exposure Dose (mg/kg/day) Exposure Dose (mg/kg/day)
Antimony Surface Soil 1.7E-05 5.0E-06 7.0E-05 7.1E-06 2.1E-06 3.0E-05      
Surface Water 8.4E-06 5.0E-06              
Fish                  
Total 2.5E-05 1.0E-05 7.0E-05 7.1E-06 2.1E-06 3.0E-05      
Arsenic Surface Soil 1.4E-05 4.3E-06 6.0E-05 1.8E-04 5.5E-05 7.7E-04 1.5E-04 4.1E-05 5.8E-04
Surface Water 2.3E-05 1.4E-05              
Fish                  
Total 3.7E-05 1.8E-05 6.0E-05 1.8E-04 5.5E-05 7.7E-04 1.5E-04 4.1E-05 5.8E-04

Note: Highlighted exposure doses indicate estimated daily contaminant exposure dose is above the ATSDR's Chronic Oral MRL or EPA's Chronic Oral RfD


Table C-10.

Summary of Non-Carcinogenic Exposure Dose of the Concerned Contaminants in Different Areas
Contaminant Exposure Media Location BD6 (Northwest Dump) Bailey Tunnel Outlet  
    Recreational Users Reclamation Workers Recreational Users Reclamation Workers Recreational Users Reclamation Workers
    Children Adults Children Adults Children Adults
    Exposure Dose (mg/kg/day) Exposure Dose (mg/kg/day) Exposure Dose (mg/kg/day)
Antimony Surface Soil 4.0E-04 1.2E-04 1.7E-03            
Surface Water       2.7E-04 1.6E-04        
Fish                  
Total 4.0E-04 1.2E-04 1.7E-03 2.7E-04 1.6E-04        
Arsenic Surface Soil 7.0E-05 2.1E-05 2.9E-04            
Surface Water       3.1E-04 1.9E-04        
Fish                  
Total 7.0E-05 2.1E-05 2.9E-04 3.1E-04 1.9E-04        

Note: Highlighted exposure doses indicate estimated daily contaminant exposure dose is above the ATSDR's Chronic Oral MRL or EPA's Chronic Oral RfD



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