Postflood Occurence of Selected Agricultural Chemicals and Volatile Organic Compounds in Near-Surface Unconsolidated Aquifers in the Upper Mississippi River Basin 1993

U.S. Geological Survey, Circular 1120-G

by Dana W. Kolpin, and E. Michael Thurman

Table of Contents

Foreword

Abstract

Introduction

Purpose and scope

Results of previous studies

Study design and methods

Data-collection methods

Quality assurance

Statistical methods

Extent of flooding problems

Chemical occurrence and distribution

Herbicides and metabolites

Nutrients

Nitrate

Volatile organic compounds

Summary

References cited

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