STATE OF MINNESOTADEPARTMENT OF NATURAL RESOURCESECOLOGICAL AND WATER RESOURCES DIVISION

COUNTY ATLAS SERIESBLUE EARTH COUNTY

ATLAS C-26, PART B, PLATE 9 of 9Hydrogeologic Cross Sections

Prepared and Published with the Support of the MINNESOTA ENVIRONMENT AND NATURAL RESOURCES TRUST FUND and the CLEAN WATER, LAND AND LEGACY AMENDMENT

Hydrogeologic Cross SectionsBy James A. Berg

2016

LOCATION DIAGRAM

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GEOLOGIC ATLAS OF BLUE EARTH COUNTY, MINNESOTA

This map was compiled and generated in a geographic information system (GIS). Digital data products, including chemistry and geophysical data, are available from the DNR Ecological and Water Resources Division at http://www.mndnr.gov/waters.This map was prepared from publicly available information only. Every reason-able effort has been made to ensure the accuracy of the factual data on which this map interpretation is based. However, the Department of Natural Resources does not warrant the accuracy, completeness, or any implied uses of these data. Users may wish to verify critical information; sources include both the references in the report and information on file in the offices of the Minnesota Geological Survey and the

Minnesota Department of Natural Resources. Every effort has been made to ensure the interpretation shown conforms to sound geologic and cartographic principles. This map should not be used to establish legal title, boundaries, or locations of improvements.Base modified from Minnesota Geological Survey, Blue Earth County Geologic Atlas, Part A, 2012.Universal Transverse Mercator projection, zone 15N, North American Datum of 1983. Vertical datum is mean sea level.GIS and cartography by James A. Berg, Shana Pascal, and Holly Johnson. Edited by Carrie Jennings and Ruth MacDonald.

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Symbols

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Part B line of cross section shown on this plateWell used to generate cross section

Part B line of cross section not shown on this platePart A line of cross section

The DNR Information Center

Minnesota Department of Natural ResourcesEcological and Water Resources Division500 Lafayette RoadSt. Paul, MN 55155-4025For more information call 651-296-6157 or 888-646-6367http://www.mndnr.gov/waters

This information is available in alternative format on request.

The Minnesota DNR prohibits discrimination in its programs and services based on race, color, creed, religion, national origin, sex, public assistance status, age, sexual orienta-tion, or disability. Persons with disabilities may request reasonable modifications to access or participate in DNR programs and services by contacting the DNR ADA Title II coordinator at info.dnr@state.mn.us or 651-259-5488. Discrimination inquiries should be sent to Minnesota DNR, 500 Lafayette Road, St. Paul, MN 55155-4049; or Office of Civil Rights, U.S. Department of the Interior, 1849 C St. NW, Washington, DC 20240.

© 2016, State of Minnesota, Department of Natural Resources and the Regents of the University of Minnesota.

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CROSS SECTION EXPLANATION

If shown, arsenic concentration equals or exceeds 5 parts per billion.

13.4

If shown, chloride concentration equals or exceeds 5 parts per million.

15.8

If shown, nitrate-nitrogen concentration equals or exceeds 1 part per million.

1.21

If shown, groundwater residence time in years, estimated by carbon-14 (14C) isotope analysis

15,000

Symbols and labels

Land or bedrock surface

General groundwater flow direction

Geologic contact

Approximate equipotential contour; contour interval 20 feet

900

Water table

Groundwater conditions

Grouped by sand content suggesting relative hydraulic conductivity.

Quaternary aquitards

Percent sandGeologic unit code

Texture unknownUndifferentiated sediment (ups)

> 30 and ≤ 40mt

uh, lh, g1, g2, et ≤ 30

Tritium age

Darker color in small vertical rectangle (well screen symbol) indicates tritium age of water sampled in well. The color in the surrounding area indicates interpreted age of water in aquifer.

Mixed: water is a mixture of recent and vintage waters (greater than 1 TU to less than 8 TU).

Well was not sampled for tritium.

Vintage: water entered the ground before 1953 (less than or equal to 1 TU).

Recent: water entered the ground since about 1953 (8 to 15 tritium units [TU]).

Aquifers and aquitards grouped by stratigraphy

BedrockColor overlay indicates tritium age.

Buried sand and gravel and Quaternary

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St. Lawrence Formation*_sl

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Oneota Dolomite (Prairie du Chien)*

Lower Tunnel City Group*Tunnel City

Enhanced-permeability zone

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Groundwater moves from an overlying surficial aquifer to a buried aquifer

Groundwater discharge from a buried aquifer to surface water

Groundwater flows laterally

Groundwater flowpath is unknown (deep groundwater with recent or mixed tritium age)

*aquitard

*aquitard

(Some conditions shown are interpreted and do not correspond to tritium data locations.)