Arsenic in Ground Water of the Willamette Basin, Oregon

By Stephen R. Hinkle and Danial J. Polette

U.S. GEOLOGICAL SURVEY

Water-Resources Investigations Report 98-4205

Prepared in cooperation with the
Oregon Water Resources Department
 
 
 
 
 
 

Portland, Oregon
1999

PDF version (1.2 MB)

CONTENTS

Summary and Conclusions

Introduction

Study Design and Methods

Data Quality: Sampling and Analytical Variability versus Environmental Variability

Distribution of Arsenic

Geochemistry of Arsenic

References Cited

Appendix

Figures

       Plate 1 (222 KB map) Arsenic concentrations in ground water, and selected geologic units

1. Map showing location and features of the Willamette Basin, Oregon
   
2. Well-location system
   
3. Comparison of arsenic concentrations determined by various processing and analytical methods
   
4. Temporal variation in arsenic concentrations
   
5. Arsenic concentrations for sites sampled in the Willamette Basin, Oregon
   
6. Relation of arsenic concentration to well depth

Tables

1. Comparison of historical arsenic concentrations with arsenic concentrations measured during this project
2. Comparision of arsenic concentrations for various processing and analytical methods
3. Temporal variation in arsenic concentrations and specific conductance
4. Speciation of arsenic

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