|
Table 1 - Maximum Site-Related Shallow Groundwater
Contamination Found at the FMC or Simplot Facilities and in the Old
Pilot House Cafe Well and the Frontier Well, Eastern Michaud Flats Contamination
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. |
