Southeast Idaho Phosphate Mining Resource Area - Agency for ...

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MW (2000) believes that sheep receive lower potential exposures than cattle because sheep spend less time on reclaimed mine sites. Others agree that sheep probably prefer wooded areas and would not spend as much time grazing on reclaimed mine areas as cattle (Bollar 2000). Tissue analysis of selenium in sheep has been done from time to time for diagnostic purposes but no studies have been conducted to determine selenium levels in sheep used for food. The available data are insufficient for estimating selenium concentrations in sheep muscle to potentially be consumed by people. We recommend that a study to determine plausible exposure scenarios for people eating sheep or lambs, information about depuration and an analysis of the selenium content of sheep be done. c). Elk Elk are exposed to selenium in forage growing on overburden dumps associated with Mabey Creek, Dry Valley Creek and probably other areas. Elk are very mobile and forage over many areas that are not elevated in selenium. Therefore, forage levels and elk meat levels may not be correlated (BLM 1999). Whether elk ingest enough selenium to cause health effects within the elk or humans that consume elk had not been investigated until last year. The IDFG collected elk muscle and liver tissue from elk harvested by hunters (Jones 2000). In September 1999, IDFG sent letters to hunters holding permits in game management units 76 and 66a, (which contain the central and eastern parts of the resource area) asking for their cooperation in a study. IDFG took muscle samples at check stations and asked hunters to save a part of the liver while dressing out the carcass and to give those samples to IDGF at the check stations between October 23 and November 7 (MW 1999b; MW 2000). The hunter=s name, the age and sex of the elk, and the date and location of the kill were recorded. Elk killed 10 miles or more from a phosphate mine were considered controls. Levels of selenium and cadmium in muscle and liver tissue were determined. Samples were analyzed at the University of Idaho=s Analytical Sciences Laboratory. The data suggest there was a difference between control and mine area animals. Preliminary results of this elk investigation were published by MW (2000). One hundred-sixty liver and 90 muscle samples were analyzed. Concentrations as high as 0.92 mg/kg in elk muscle and 13 mg/kg in elk liver tissue were found in elk killed near mining areas (Table 1.0). d). Fish The Blackfoot River and several of its tributaries are classified as high-quality trout streams by the USFS. Cutthroat trout have been studied more than the other fish species in the area and subjected to the most management. They ascend from the Blackfoot Reservoir into the tributaries to spawn. Rainbow trout spawn in the main river. Brook trout also spawn in the tributaries (BLM 1999). Although Cutthroat trout are the most important fish species for conservation, brook trout, brown trout and rainbow trout would also be of interest for human consumption. Selenium generally concentrates in the liver and kidney, especially in trout (A.A. Rich 1999). Fish flesh and sometimes liver and kidneys of trout from the Blackfoot River and several 90
tributaries were sampled in 1998 and 1999. Cutthroat trout flesh from East Mill Creek had the highest levels of selenium, 7.9 mg/kg, found in 1998 (Table 1.0). 91
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SOUTHEAST IDAHO PHOSPHATE MINING RE
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Southeast Idaho Phosphate Mining Re
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List of Appendices Appendix A Appen
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Summary Phosphate has been mined fr
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Public Health Action Plan 1. BCEH w
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• Eastern district - Smoky Canyon
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Monsanto and Solutia). Nu-West, J.R
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3.3 Exposure Pathways and Public He
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3.3.2 Surface Water Exposure Pathwa
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For non-cancer health effects, the
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as the Native American subsistence
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about four times higher than the ch
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3.3.5.3 Beef Exposure Pathway For n
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Arsenic can also cause cancer. Howe
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Cancer incidence (cases), instead o
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incidence rates for some cancer typ
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7. Authors, Technical Advisors Repo
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[EPA] U.S. Environmental Protection
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Appendix A Map of Southeast Idaho P
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Explanation of Evaluation Process S
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ecommends secondary standards to wa
Page 45 and 46: Table C-1 Health Comparison Values
Page 47 and 48: Table C-3 Contaminants of Concern i
Page 49 and 50: Table C-5 Contaminants of Concern i
Page 51 and 52: Table C-7 Contaminant Health Guidel
Page 53 and 54: Table C-9 Description of Exposure S
Page 55 and 56: Appendix D Exposure Pathways for So
Page 57 and 58: Appendix E ATSDR Interim Public Hea
Page 59 and 60: Appendix F Health Consultation: Eva
Page 61 and 62: Background and Statement of Issue T
Page 63 and 64: derived are described in the follow
Page 65 and 66: Reference ATSDR 1996. Toxicological
Page 67: Appendix A. Well Sampling Locations
Page 70 and 71: Appendix G Health Consultation: Sel
Page 72 and 73: BACKGROUND AND STATEMENT OF ISSUE
Page 74 and 75: Screening values are target chemica
Page 76 and 77: Temporary Selenium Fish Advisory Th
Page 78 and 79: REFERENCES ATSDR 2001. Toxicologic
Page 80 and 81: PREPARERS OF REPORT AND CERTIFICATI
Page 82 and 83: Appendix A. Streams of the Upper Bl
Page 84 and 85: Appendix B. Fish Selenium Concentra
Page 86 and 87: Appendix H Health Consultation: Eva
Page 88 and 89: LIST OF ACRONYMS ADI ATSDR BEHS BLM
Page 90 and 91: phosphate lease. The project area i
Page 92 and 93: staff with concerns about animals h
Page 94 and 95: Currently, no data on selenium conc
Page 98 and 99: Table 1.0 Levels of Selenium Found
Page 100 and 101: and what levels of selenium might b
Page 102 and 103: The EPA=s reference dose (RfD) is d
Page 104 and 105: may be more susceptible (ATSDR 1996
Page 106 and 107: Further sampling of livestock, fish
Page 108 and 109: VI. REFERENCES A.A. Rich and Associ
Page 110 and 111: Yang, G. , S. Yin, R. Zhou, et. al.
Page 112 and 113: ATTACHMENT A Map of Southeast Idah
Page 114 and 115: ATTACHMENT B Summary of Studies Us
Page 116 and 117: Depuration Study were also reported
Page 118 and 119: 66a, (which contain the central and
Page 120 and 121: There has also been a great deal of
Page 122 and 123: Table 1: Interim Public Health Haza
Page 124 and 125: VIII. PREPARERS OF REPORT AND CERT
Page 126 and 127: Appendix I Cancer Incidence Evaluat
Page 128 and 129: Table I-2 Comparison of Cancer inci
Page 130 and 131: Appendix J ATSDR Glossary of Terms
Page 132 and 133: Analyte A substance measured in the
Page 134 and 135: Community Assistance Panel (CAP) A
Page 136 and 137: occur. The environmental media and
Page 138 and 139: Health education Programs designed
Page 140 and 141: Mutagen A substance that causes mut
Page 142 and 143: Public health advisory A statement
Page 144 and 145: Sample A portion or piece of a whol
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Uncertainty factor Mathematical adj
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Response to Comments Received durin
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the copper concentrations, BCEH det
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impacting an area covering some 250
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also existed seventeen samples that
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make a decision regarding any possi
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e inadequate. Data collected during
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