Evaluation Of Water Quality Impacts Associated With FMC And

5,17

MB

Simplot Phosphate Ore Processing Facilities, Pocatello, Idaho

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stron

5948

ID

UNITED STATES ENVIRONMENTAL PROTECTION AGENCY

2004

rok

Table of Contents

Table of Contents v

List of Tables vi

List of Figures vii

EXECUTIVE SUMMARY xi

INTRODUCTION 1

PROBLEM STATEMENT 1

PURPOSE AND OBJECTIVES 1

DATA SOURCES 2

STUDY AREA DESCRIPTION 3

DESCRIPTION OF FACILITIES AND SITE HISTORY 3

REGIONAL HYDROGEOLOGY 4

LOCAL HYDROGEOLOGY 5

RIVER SAMPLING 6

INITIAL PORTNEUF RIVER TRANSECT DATA COLLECTION 7

ADDITIONAL RIVER TRANSECT DATA 8

RIVER TRANSECT SAMPLING RESULTS 9

CONTAMINANT LOADING ANALYSIS 10

REGIONAL GROUND WATER 10

BATISTE SPRING AND CHANNEL 11

CITY OF POCATELLO WASTEWATER TREATMENT PLANT 11

SIMPLOT WASTEWATER LAND APPLICATION SITE 12

FMC/SIMPLOT FACILITY GROUND WATER 12

Quality 12

Flow and Loading Calculations 12

PHOSPHORUS AND NITRATE CONCENTRATIONS AND LOADS IN THE PORTNEUF RIVER 13

REGIONAL GROUND WATER DISCHARGE AND LOADING 13

BATISTE SPRING DISCHARGE AND LOADING 14

CITY OF POCATELLO WASTEWATER TREATMENT PLANT DISCHARGE AND LOADING 15

SIMPLOT WASTEWATER LAND APPLICATION SITE DISCHARGE AND LOADING 16

FMC/SIMPLOT FACILITIES DISCHARGE AND LOADING 16

LOADING ESTIMATE ACCURACY 17

ANALYSIS OF GEOCHEMICAL DATA 17

GEOCHEMICAL DATA SOURCES 17

RIVER/NEAR RIVER GEOCHEMISTRY 18

STABLE ISOTOPES 18

Isotope Abundance 19

Oxygen and Deuterium 19

Sulfur 19

Evaluation Of Isotope Data 20

FACILITY-WIDE GEOCHEMISTRY 22

JOINT FENCELINE AREA GEOCHEMISTRY 24

FLOWPATH GEOCHEMICAL ANALYSIS 25

Selection of Flowpaths 26

General Chemistry 27

Chemical Speciation 28

Saturation Indices 29

Geochemical Data Conclusions 31

CONCLUSIONS 32

RECOMMENDATIONS 33

REFERENCES 34

TABLES 37