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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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