94°30' W.

94°45' W.

94°15' W.

94° W.

44°15' N.

44°22'30" N.

NorthMankato

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

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Part A line of cross sectionA A’

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1 0 1 2 3 4 5 MILES

1 0 1 2 4 5 6 7 83 9 KILOMETERS

SCALE 1:100 000VERTICAL EXAGGERATION X 50

uhsh/svlh,vtsmmtstttsbbtsg1g1sg2g2sgeetsuuUndifferentiated sediment (ups)

ss

Aquifers and aquitards grouped by stratigraphy

Quaternary unconsolidated sediment (see figure 4 for geologic unit correlation)

Quaternary aquitardsGrouped by texture ranging from highest to lowest sand content, indicating relative hydraulic conductivity. Lighter shades of gray represent units with higher hydraulic conductivity and darker shades of gray have lower hydraulic conductivity.

Surficial sand and gravel

Buried aquifers and aquitards

Hydrogeologic unit code Percent sand

Bedrock Dakota

Unnamed

Saprolith

Prairie du Chien

Jordan

St. Lawrence Formation

Upper Tunnel City

Lower Tunnel City Group

Wonewoc

Eau Claire Formation

Mt. Simon

Precambrian crystalline bedrock

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>50% and ≤60%

>40% and ≤50%

>30% and ≤40%

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

Groundwater flows laterally.

Groundwater moves from an overlying buried aquifer to an underlying buried aquifer.

Groundwater conditionsWater from the surface moves through a thin layer of overlying fine-grained material to an underlying aquifer.Groundwater moves from an overlying surficial aquifer to a buried aquifer.

If shown, chloride concentration equals or exceeds 5 parts per million.9.9

If shown, nitrate-nitrogen concentration equals or exceeds 1 part per million.8.9

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

4000

Symbols and labels

Land or bedrock surface

General groundwater flow direction

Geologic contact

Approximate equipotential contour; contour interval 25 feet900

Water table

Tritium ageDarker color in small vertical rectangle (well screen symbol) indicates tritium age of water sampled in well. Lighter color indicates interpreted age of water in aquifer.

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

Well not sampled for tritium.

Enhanced-permeability zone

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]).

CROSS SECTION EXPLANATION

Interpreted tritium age is indicated by background color

Interpreted tritium age is indicated by pattern color

Groundwater discharge to a surface-water body.

Groundwater movement is out of cross section.

If shown, arsenic concentration equals or exceeds 5 parts per billion.5.4

If shown, manganese concentration equals or exceeds 100 parts per billion.273

LOCATION DIAGRAM

GEOLOGIC ATLAS OF NICOLLET COUNTY, MINNESOTA

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 orientation 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 coordina-tor 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 Street NW, Washington, DC 20240.

© 2016, State of Minnesota, Department of Natural Resourcesand the Regents of the University of Minnesota

This map was compiled and generated in a geographic information system (GIS). Digital data products, including chemistry data, are available from the Minnesota Department of Natural Resources (DNR) Ecological and Water Resources Division at http://www.mndnr.gov/waters.This map was prepared from publicly available information. Every reasonable effort has been made to ensure the accuracy of the factual data on which this map interpretation is based. How-ever, the DNR 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 DNR. Every effort has been made to ensure the interpretation shown conforms to sound geologic and carto-graphic principles. This map should not be used to establish legal title, boundaries, or locations of improvements.Base modified from Minnesota Geological Survey, Nicollet County Geologic Atlas, Part A, 2012.Universal Transverse Mercator projection, zone 15N, North American Datum of 1983. North American Vertical Datum of 1988.GIS and cartography by Vanessa M. Baratta and Holly Johnson. Edited by Ruth MacDonald.

COUNTY ATLAS SERIESNICOLLET COUNTYAtlas C-25, Plate 8 of 8

Hydrogeologic 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

STATE OF MINNESOTADEPARTMENT OF NATURAL RESOURCESECOLOGICAL AND WATER RESOURCES DIVISION

Hydrogeologic Cross SectionsBy Vanessa M. Baratta and Todd A. Petersen

2016