Preface iii

Introduction 1

Cooperation 1

Summary of hydrologic conditions 1

Explanation of ground-water-level records 1

Site identification numbers 1

Data collection and computation 4

Data presentation 4

Water-level tables 6

Hydrographs 6

Ground-water-quality data 6

Data collection and computation 6

Laboratory measurements 6

Remark codes 7

Blank samples 7

Reference samples 7

Replicate samples 7

Spike samples 7

Access to USGS water data 7 Definition of terms 7

Ground-water levels 10

Network sites 10

Sheyenne Delta sites 185

Ground-water quality 194

Network sites 194

Sheyenne Delta sites 196

Spirit Lake Reservation sites 203

Index 207

ILLUSTRATIONS

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Figure 1. Map showing locations of ground-water observation wells 2

2. Map showing locations of ground-water observation wells on the Spirit Lake Reservation 3

3. System for numbering wells (latitude and longitude) 5

4. System for numbering wells (township and range) 5

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