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Table 1.

Maximum Site-Related Surface Water Contamination Found at the FMC or J.R. Simplot Facilities, Eastern Michaud Flats Contamination National Priorities List Site, Pocatello, Bannock County, Idaho

Contaminant Maximum Concentration at the FMC Facility Maximum Concentration at the J.R. Simplot Facility Comparison Value for Ingestion and Source*
Metals, Nutrients, and Fluoride (milligrams per liter)
Arsenic (Total)6.00.040.01 EMEG
Boron (Total)6.80.510.4 Intermediate EMEG
Cadmium (Total)5,2680.540.007 EMEG
Chromium (Total)3.00.420.1 LTHA
Fluoride1,25026.64 MCLG
Nitrate as Nitrogen18.44.210 MCL
Selenium (Total)6.30.120.02 EMEG
Sulfate19,8002,590500 MCLG
Radiological Parameters (picocuries per liter)
Gross Alpha23236015 MCL
Gross Beta9,72027250 MCL

* - 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).

Note: The concentrations reported for the FMC facility have been adjusted (increased 150%) because the facility now uses a richer ore than previously.

 

 

Table 2.

Maximum Site-Related Sediment Contamination Found at the FMC or J.R. Simplot Facilities, Eastern Michaud Flats Contamination National Priorities List Site, Pocatello, Bannock County, Idaho
-
Contaminant Maximum Concentration at FMC Facility Maximum Concentration at J.R. Simplot Facility Comparison Value for Ingestion and Source*
Metals, Nutrients, and Fluoride (milligrams per kilogram)
Arsenic25613.00.5 CREG
Boron2,6401937,000 Adult Intermediate EMEG
Cadmium2,410108500 Adult EMEG
Chromium6772,3504,000 Adult EMEG
Fluoride191,00025,90035,000 Adult EMEG
Selenium49.661.21,000 Adult EMEG
Radiological Parameters (picocuries per gram)
Gross Alpha29913115
Gross Beta7836450
* = 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).

 

Table 3.

Maximum Surface Water Contamination Found in the Portneuf River Beyond the FMC or J.R. Simplot Facility Fence Lines, Eastern Michaud Flats National Priorities List Site, Pocatello, Bannock County, Idaho

Table 3

Contaminant Maximum Concentration in the Portneuf River near the Facilities Maximum Concentration in the Portneuf River Up-Stream from the Facilities Comparison Value for Ingestion and Source*
Metals, Nutrients, and Fluoride (milligrams per liter)
Arsenic (Total)0.0060.0140.01 EMEG
Boron (Total)0.380.330.4 Intermediate EMEG
Cadmium (Total)0.00030.0010.007 EMEG
Chromium (Total)0.0020.0010.1 LTHA
Fluoride0.650.394 MCLG
Nitrate as Nitrogen1.31.210 MCL
Selenium (Total)0.0050.0130.02 EMEG
Sulfate6550500 MCLG
Radiological Parameters (picocuries per liter)
Gross Alpha5.84.915 MCL
Gross Beta4.99.850 MCL
* - 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).

 

Table 4.

Maximum Sediment Contamination Found in the Portneuf River Beyond the FMC or J.R. Simplot Facility Fence Lines, Eastern Michaud Flats National Priorities List Site, Pocatello, Bannock County, Idaho

Contaminant Maximum Concentration in the Portneuf River near the Facilities Maximum Concentration in the Portneuf River Up-Stream from the Facilities Comparison Value for Ingestion and Source*
Metals, Nutrients, and Fluoride (milligrams per kilogram)
Arsenic3.79.90.5 CREG
Boron10.313.27,000 Adult Intermediate EMEG
Cadmium22.20.82500 Adult EMEG
Chromium10.65.14,000 Adult EMEG
Fluoride3,08055035,000 Adult EMEG
Selenium0.880.721,000 Adult EMEG
Radiological Parameters (picocuries per gram)
Gross Alpha29.213.615
Gross Beta3025.350
* - 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).

 

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