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Table of Contents

Abstract

Introduction

Geology

Hydrology

Chemical Quality

Summary

Well Records

Logs of Test Holes

References

Plate

Introduction

Jefferson County is an area of about 552 square miles in northeastern Kansas. It is bounded on the north by Atchison County, on the east by Leavenworth County, on the south by Douglas County, and on the west by Jackson and Shawnee Counties. Figure 1 shows the area of this study and other areas in the State for which groundwater reports have been published or are in preparation.

Figure 1--Index map of Kansas showing area described in this report and areas covered by other geologic maps, as of Jan. 2002. For additional information, see the KGS Geologic Maps of Kansas Page.

Well and test-hole numbers used in this report give the location of wells according to General Land Office surveys. The well number is composed of township, range, and section numbers, followed by letters that indicate the subdivision of the section in which the well is located. The first letter denotes the quarter section; the second letter denotes the quarter-quarter section, or 40-acre tract; the third letter denotes the quarter-quarter-quarter section, or 10-acre tract. The 160-acre, 40-acre, and 10-acre tracts are designated a, b, c, and d in a counter-clockwise direction, beginning in the northeast quarter (fig. 2). When two or more wells are located within a 10-acre tract, the wells are numbered serially according to the order in which they were inventoried. For example, well 8-17E-22acd is in the SE 1/4 SW 1/4 NE 1/4 sec. 22, T. 8 S., R. 17 E., and is the first well inventoried in that tract.

Figure 2--Well numbering system used in this report.

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