Table 1.
Maximum Site-Related Shallow Groundwater Contamination Found at the FMC or Simplot Facilities and in the Old National Priorities List Site, Pocatello, Bannock County, Idaho | |
| Contaminant | Maximum Mean Concentration at FMC or Simplot Facilities | Maximum Concentration in the Old Pilot House Cafe Well | Maximum Concentration in the Frontier Well | Comparison Value for Ingestion and Source* |
| Metals, Nutrients, and Fluoride (milligrams per liter) |
|---|
| Arsenic (Total) | 0.658 | 7.48 | 3.08 | 0.01 EMEG |
|---|
| Boron (Total) | 17.103 | 0.91 | 0.21 | 0.4 Intermediate EMEG |
|---|
| Cadmium (Total) | 2.62 | <0.005 | <0.005 | 0.007 EMEG |
|---|
| Chromium (Total) | 3.81 | <0.003 | 0.002 | 0.1 LTHA |
|---|
| Cobalt (Total) | 0.106 | 0.02 | 0.01 | 0.04 EMEG |
|---|
| Fluoride | 1,061 | <0.2 | 0.6 | 4 MCLG |
|---|
| Nitrate/Nitrite as Nitrogen | 74.3 | 16.3 | 2.36 | 10 MCL |
|---|
| Selenium (Total) | 0.192 | 0.006 | 0.006 | 0.02 EMEG |
|---|
| Sulfate | 2,506 | 240 | 221 | 500 MCLG |
|---|
| Radiological Parameters (picocuries per liter) |
|---|
| Gross Alpha | 1,690 | 20.7 | 2.12 | 15 MCL |
|---|
| Gross Beta | 1,163.2 | 96.5 | 9.24 | 50 MCL |
|---|
| Potassium-40 | 1,210 | 112 | NM | - |
|---|
| Radium-226 | 2.83 | 1.56 | <1 | 5 MCL (Summation) |
|---|
| Radium 228 | 12.9 | 7.1 | <1 |
|---|
| Uranium-233/234 | 29.4 | <1 | <1 | 30 MCL** (Summation) |
|---|
| Uranium-238 (alpha) | 11.2 | <1 | <1 |
|---|
| * - A description of the various comparison values is presented in Appendix B. Unless indicated otherwise, the comparison values listed are for chronic exposures (greater than 365 days). ** - The MCL was developed by assuming that the Uranium is naturally occurring. NM means not measured. |
Table 2.
Maximum Site-Related Contaminant Concentrations Found in the Batiste and Swanson Road Springs, Eastern Michaud Flats contamination National Priorities List Site, Pocatello, Bannock County, Idaho | |
| Contaminant | Maximum Concentration in the Batiste Spring | Maximum Concentration in the Swanson Road Spring | Comparison Value for Ingestion and Source* |
| Metals, Nutrients, and Fluoride (milligrams per liter) |
|---|
| Arsenic (Total) | 0.094 | 0.013 | 0.01 EMEG |
|---|
| Boron (Total) | 0.167 | 0.43 | 0.4 Intermediate EMEG |
|---|
| Cadmium (Total) | 0.005 | 0.0003 | 0.007 EMEG |
|---|
| Chromium (Total) | 0.002 | 0.002 | 0.1 LTHA |
|---|
| Cobalt (Total) | 0.01 | 0.0089 | 0.04 EMEG |
|---|
| Fluoride | 0.63 | 0.5 | 4 MCLG |
|---|
| Nitrate/Nitrite as Nitrogen | 16 | 2.92 | 10 MCL |
|---|
| Selenium (Total) | 0.01 | 0.0036 | 0.02 EMEG |
|---|
| Sulfate | 192 | 116 | 500 MCLG |
|---|
| Radiological Parameters (picocuries per liter) |
|---|
| Gross Alpha | <1 | 3.51 | 15 MCL |
|---|
| Gross Beta | 10.4 | 8.0 | 50 MCL |
|---|
| Potassium-40 | <1 | 8.0 | - |
|---|
| Radium-226 | 4.6 | 1.82 | 5 MCL (Summation) |
|---|
| Radium-228 | 7.4 | 2.2 |
|---|
| Uranium-233/234 | 1.52 | NM | 30 MCL** (Summation) |
|---|
| Uranium-238 (alpha) | 1.1 | NM |
|---|
| * - A description of the various comparison values is presented in Appendix B. Unless indicated otherwise, the comparison values listed are for chronic exposures (greater than 365 days). ** - The MCL was developed by assuming that the Uranium is naturally occurring. NM means the contaminant was not measured. |
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