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Kennecott Copper Mine (North Zone)

• April 20, 2004
• By
• Ben Chadwick, Shweta Mehta, Purvi Patel

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Site Location

• Located near the south shore of the Great Salt
  Lake
• Approximately 15 miles west of Salt Lake City
• Mine is located in the north end of the Oquirrh
  mountains
• Next to the community of Magna

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Site Description

• Kennecott North Zone consists of 4 primary areas
  
• Magna
• Great Salt Lake Park
• Tooele Valley
• West Valley City

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Site Description

• Owned by Kennecott Copper Corporation
• Site involves smelting and refining of
  concentrated copper ore
• The mine is so big that it can be seen from the
  space.

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Site History

• 1863 Initial exploration and mining of mineral
  resources
• 1906 Large scale open-pit mining begins
• 1930 The Hill becomes the Pit
• 1945 Mine produces 1/3 of copper used
• during World War II

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Site History

• 1960 100 million modernization of the
• mine
• 1991 EPAs involvement at the site begins
• 1994 Proposed for the Superfund National
• Priorities List (NPL)
• 1995 Kennecott, EPA the State of Utah
• signed an agreement, saying that
• Kennecott will continue the
  cleanups.

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Site Characterization

• Magna
• Approx. 20,000 residents
• Primary airborne contaminants
• Arsenic
• Cadmium
• Site contains a 5,700 acre tailing pond

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Site Characterization Cont..

• Great Salt Lake Park
• Occupies about 3½ miles of shoreline
• Approx. 700,000 visitors per year
• Recreation near the site includes lakeshore
  swimming, wading, sunbathing, bird watching.
• Surface water and air contamination occurs from
  sludge ponds, slag piles, other smelter waste.

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Site Characterization Cont..

• Tooele Valley
• Tooele Valley extends between the Stansbury
  Mountains and Oquirrh Mountains.
• Population about 17,000
• Airborne contaminants are released from the
  facilitys smelter stacks

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Site Characterization Cont..

• West Valley City
• Located east of Magna
• It is considered an
• off-site area
• Approximate population 109,000
• Potential route of exposure Soil, Air

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Data Collection Evaluation

• Maximum concentration values were used for this
  risk assessment
• Contaminant concentration values came from EPA
  sampling data
• Heavy metals are of primary concern
• Particulates and Sulfur Dioxide were not
  considered in the risk assessment

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Data Collection Evaluation

• Chemicals of Concern (COCs)
• Carcinogens
• Arsenic
• Lead
• Beryllium
• Cadmium

• Non-Carcinogens
• Aluminum
• Copper
• Barium
• Manganese
• Vanadium
• Zinc
• Selenium

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Exposure Assessment

• Exposure Routes
• Ingestion
• Inhalation
• Dermal Contact
• Potential Receptors
• Adult (workers/non-workers)
• Child

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Exposure Assessment Cont..
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Exposure Assessment Cont..
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Exposure Assessment Cont..
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Exposure Assessment Cont..
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Kennecott Smoke Stack Mine Vicinity
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Toxicity Assessment
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Toxicity Assessment Cont..
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Toxicity Assessment Cont..
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Risk Characterization

• After collecting all the data, the risk
  characterization is conducted using SmartRISK
• SmartRISK Input
• Chemicals of concerns
• Concentrations of COCs
• Exposure routes Scenarios
• Certain assumptions
• SmartRISK Output
• Cancer Non-cancer risks

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Risk Characterization Cont..

• Assumptions
• The values used for the RfD SF come from
  SmartRISK
• Due to the unavailable data for lead, we made
  assumptions for the SF value
• For the Great Salt Lake Park, the below
  assumptions were made for recreation
• Ingestion rate 0.1 L/day
• EF 12 days/year
• ET 3 hours/day

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Results Cancer Non-cancer Risk
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Results Bar Chart

• Magna Cancer (residential, adult)

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Results Bar Chart

• Great Salt Lake Park Non-cancer (recreational,
  adult)

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Results Bar Chart

• Tooele Valley Cancer (residential, adult)

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Results Bar Chart

• West Valley City Non-cancer (residential, child)

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Risk Assessment Summary

• Approximately 98 of cancer risk comes from
  Arsenic
• The actual cancer risk lt calculated risk because
  high dose animal CSF data has been used for low
  dose exposure in humans.
• The higher risk values found in the Great Salt
  Lake Park are due to our conservative approach
  (assumptions).
• The greatest risk comes from ingestion of soil

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Any Questions?