Table C-1. Exposure Pathways, Elizabeth Copper Mine Site | |||||||
---|---|---|---|---|---|---|---|
Pathway Name | Source | Media | Point of Exposure | Route of Exposure | Exposed Population | Time-frame | Comments |
Surface Soil | Elizabeth Mine | Surface soil | Tailings piles at site Residential surface soil |
Incidental ingestion, Dermal contact | Past workers, nearby residents, trespassers | Past Current Future | Exposure to on-site soil is thought to be limited to past workers and possibly occasional site trespassers. Wind may have blown soil from the site to nearby residences. Metals were detected at slightly elevated levels in tailings piles and in residential yards. |
Indoor dust | Elizabeth Mine | Indoor dust | Residential homes near the site | Incidental ingestion, Dermal contact | Residents living near the site | Past Current Future | Winds may have blown soil from the site to homes nearby, where residents come in contact with dust that settles in their homes. Indoor dust samples contained slightly elevated levels of certain metals. |
Ambient Air | Elizabeth Mine | Air | Site vicinity | Inhalation | Residents near the site | Past Current Future | Residences are located within a few hundred feet of the mine site boundary. The closest residence is 150 feet from one mine tailings pile. Slightly elevated levels of some metals were detected in air sampled outside three nearby homes. |
Table C-2. Off-site surface soil contaminants detected above comparison values, Elizabeth Copper Mine Site | ||||||
---|---|---|---|---|---|---|
Chemical | Maximum Level (ppm) | Date of Maximum | Comparison Value (CV) (ppm) | Type | Exceedences / Detections / Samples | Location of Maximum |
First Sampling Round | ||||||
Arsenic | 8.5 | 7/20/00 | 0.5 | CREG | 8/8/9 | Residence #3 |
Iron | 198,000 | 7/20/00 | 23,000 | RBC-N | 5/9/9 | Residence #3 |
Thallium | 20.5 | 7/27/00 | 5.5 | RBC-N | 1/4/9 | Residence #3 |
Second Sampling Round | ||||||
Arsenic | 18.3 | 11/02/00 | 0.5 | CREG | 25/25/54 | Residence #2 |
Copper | 4,690 | 11/01/00 | 3,100 | RBC-N | 1/54/54 | Residence #3 |
Iron | 144,000 | 11/01/00 | 23,000 | RBC-N | 39/54/54 | Residence #3 |
Source: Weston RF 2000b; Arthur D. Little 2000b. Key: CREG = Cancer Risk Evaluation Guide (ATSDR) ppm = parts per million RBC-N = Risk-Based Concentration for Non-Cancer effects (EPA) |
Table C-3. Residential house dust (bulk sample) contaminants detected above comparison values for the Elizabeth Copper Mine Site | ||||||
---|---|---|---|---|---|---|
Chemical | Maximum Level (ppm) | Date | Comparison Value (CV) (ppm) | Type | Detections / Samples | Location of Maximum |
Iron | 34,000 | 11/2/2000 | 23,000 | RBC-N | 10/10 | House 3 (Living room) |
Lead | 600 | 11/2/2000 | 400 | EPA Soil Screening Level |
7/10 | House 2 (3rd Floor Girl bedroom) |
Magnesium | 8,000 | 11/2/2000 | N/A | None | 10/10 | House 2 (3rd Floor Girl bedroom) |
Phosphorus | 1,700 | 11/2/2000 | 10 | I-EMEG-child | 10/10 | House 2 (3rd Floor Boy bedroom) |
Sodium | 5,000 | 11/2/2000 | N/A | None | 10/10 | House 2 (Parent bedroom/North) |
Thallium | 510 | 11/2/2000 | 140 | RBC-N | 7/10 | House 2 (3rd Floor Girl bedroom) |
Source: Lockheed Martin 2001
Note: Comparison values are soil-based; the chromium comparison value is for hexavalent chromium Key: EPA = U.S. Environmental Protection Agency I-EMEG-child = Environmental Media Evaluation Guide for Intermediate exposure to a child (ATSDR) N/A = not applicable (no CV exists) ppm = parts per million RBC-N = Risk-Based Concentration for Non-cancer effects (EPA) |
Table C-4. Residential house wipe contaminants for the Elizabeth Copper Mine Site | ||||||
---|---|---|---|---|---|---|
Chemical | Maximum Level (µg/m2) | Date | Comparison Value (CV) (µg/m2) | Type | Detections / Samples | Location of Maximum |
Aluminum | 1,500 | 11/2/2000 | — | None | 13/13 | House 1 (Child bedroom) |
Copper | 56 | 11/2/2000 | — | None | 2/13 | House 1 (Child bedroom) |
Iron | 3,500 | 11/2/2000 | — | None | 13/13 | House 3 (Living room) |
Lead | 550 | 11/2/2000 | 540 | EPA (proposed) | 12/13 | House 2 (Child bedroom) |
Magnesium | 920 | 11/2/2000 | — | None | 12/13 | House 1 (Child bedroom) |
Manganese | 72 | 11/2/2000 | — | None | 9/13 | House 1 (Child bedroom) |
Phosphorus | 1,100 | 11/2/2000 | — | None | 13/13 | House 1 (Kitchen) |
Selenium | 12 | 11/2/2000 | — | None | 2/13 | House 1 (Child bedroom) |
Sodium | 1,800 | 11/2/2000 | — | None | 12/13 | House 1 (Kitchen) |
Thallium | 250 | 11/2/2000 | — | None | 7/13 | House 3 (Kitchen) |
Titanium | 110 | 11/2/2000 | — | None | 12/13 | House 3 (Living room) |
Zinc | 86 | 11/2/2000 | — | None | 13/13 | House 3 (Living room) |
Source: Lockheed Martin 2001 Key: EPA = U.S. Environmental Protection Agency µg/m2 = micrograms per square meter |
Table C-5. On-site surface soil contaminants detected above comparison values, Elizabeth Copper Mine Site | ||||||
---|---|---|---|---|---|---|
Chemical | Maximum Level (ppm) | Date | Comparison Value (CV) (ppm) | Type | Exceedences / Detections / Samples | Location of Maximum |
Tailings Piles (Tailings Pile #1, #2, #3) | ||||||
Arsenic | 25 | 2000 | 0.5 | CREG | –/–/11 | Unknown |
Copper | 6,600 | 2000 | 3,100 | RBC-N | 2/6/11 | Tailings Pile #3 |
Iron | 360,000 | 2000 | 23,000 | RBC-N | –/–/11 | Unknown |
Tailings Piles (Tailings Pile #1, #2, #3) | ||||||
Arsenic | 15.8 | 11/01/00 | 0.5 | CREG | 3/3/3 | Tailings Pile #3 |
Iron | 170,000 | 11/01/00 | 23,000 | RBC-N | 3/3/3 | Tailings Pile #3 |
Other on-site (Tailings Pile #3, base of solvent storage shed, inside transformer storage building, and near large outdoor transformers) | ||||||
Arsenic | 20.83 | 1991 | 0.5 | CREG | 4/4/4 | Base of solvent storage shed |
Source: ATSDR 2000b; Weston RF 2000a; USGS 2000
Key: C-EMEG-child = Environmental Media Evaluation Guide for Chronic exposure to a child (ATSDR) CREG = Cancer Risk Evaluation Guide (ATSDR) MCL = Maximum Contaminant Level ppm = parts per million RBC-C = Risk-Based Concentration for Cancer effects (EPA) – = number of samples is unknown |
Table C-6. Air sampling contaminants for the Elizabeth Copper Mine Site | ||||||
---|---|---|---|---|---|---|
Chemical | Maximum Level (µg/m3) | Date | Comparison Value (CV) (µg/m3) | Type | Detections / Samples | Location of Maximum |
Aluminum | 0.67 | 11/2/2000 | 0.37 | RBC | 2/4 | 194 Old Mine Road (South) |
Chromium | 0.56 | 11/2/2000 | 0.00008 | CREG | 2/4 | 190 Old Mine Road (South) |
Iron | 0.92 | 11/2/2000 | 1,100 | RBC | 3/4 | 190 Old Mine Road (North) |
Lead | 0.18 | 11/2/2000 | — | None | 3/4 | 190 Old Mine Road (North; South) |
Phosphorus | 2,300 | 11/2/2000 | — | None | 1/4 | 190 Old Mine Road (South) |
Source: Lockheed Martin 2001
Key: CREG = Cancer Risk Evaluation Guide (ATSDR) µg/m3 = micrograms per cubic meter RBC = Risk-Based Concentration (EPA) |
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