GEOLOGIC ATLAS OF BLUE EARTH COUNTY,...

T. 105 N.

T. 105 N.

T. 106 N.

T. 106 N.

T. 107 N.

T. 107 N.

T. 108 N.

T. 108 N.

T. 109 N.

T. 109 N.

R. 25 W.

R. 25 W.

R. 26 W.

R. 26 W.

R. 27 W.

R. 27 W.

R. 28 W.

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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 geophysi-cal 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 reasonable effort has been made to ensure the accuracy of the factual data on which this map interpretation is based. However, the Depart-ment 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. North American Vertical Datum of 1988.GIS and cartography by James A. Berg, Shana Pascal, and Holly Johnson. Edited by Carrie Jennings and Ruth MacDonald.

STATE OF MINNESOTADEPARTMENT OF NATURAL RESOURCESECOLOGICAL AND WATER RESOURCES DIVISION

COUNTY ATLAS SERIESBLUE EARTH COUNTY

ATLAS C-26, PART B, PLATE 7 of 9Bedrock Groundwater Flow Directions

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

Uppermost Bedrock Groundwater Flow Directions and Bedrock Geology

By James A. Berg

2016

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 andservices based on race, color, creed, religion, national origin,sex, public assistance status, age, sexual orientation, or disability.Persons with disabilities may request reasonable modifications toaccess or participate in DNR programs and services by contactingthe DNR ADA Title II coordinator at info.dnr@state.mn.us or651-259-5488. Discrimination inquiries should be sent to MinnesotaDNR, 500 Lafayette Road, St. Paul, MN 55155-4049; or Officeof 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.

LOCATION DIAGRAM

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Sampled well and aquifer symbolsPrairie du Chien

Prairie du Chien–Jordan

Jordan

St. Lawrence

St. Lawrence and Upper Tunnel City

St. Lawrence, Upper Tunnel City, and Wonewoc

Upper Tunnel City

Upper Tunnel City and Wonewoc

Mt. Simon

Upper Tunnel City, Wonewoc, and Mt. Simon

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

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

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

Well was not sampled for tritium.

Tritium ageSymbol color indicates tritium age of water sampled.

Symbols and labelsIf shown, arsenic concentration equals or exceeds 5 parts per billion.

10.3

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

9.4

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

9.7

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

29,000

Groundwater conditions

Groundwater moves from an overlying surficial aquifer to a buried aquifer

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

Groundwater discharge from a buried aquifer to surface water

Groundwater flows laterally

Groundwater flowpath is unknown (deep ground-water with recent or mixed tritium age)

Line of cross sectionStatic water level dataSurface-water sample

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

St. Lawrence Formation*_sl

Eau Claire Formation*_e

Oo Oneota Dolomite (Prairie du Chien)*

Bedrock aquifers and aquitardsPlatteville-Glenwood formations¹

Tunnel City_tc

Wonewoc_w

Mt. Simon1The Glenwood Formation acts as an aquitard but the overlying Platteville Formation is a thin aquifer. Combined, these units are shown as an aquitard.*aquitard

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St. Peter

Jordan

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1 0 1 2 3 4 5 MILES

1 0 1 2 4 5 6 7 83 9 KILOMETERS

SCALE 1:100 000

Groundwater flow directionUpper geologic units (St. Peter Sandstone, Prairie du Chien Group, and Jordan Sandstone)Lower geologic units (St. Lawrence Formation, Tunnel City Group, Wonewoc Sandstone, Eau Claire Formation, and Mt. Simon Sandstone)

Potentiometric surface contour(dashed where approximate)

Upper geologic units (St. Peter Sandstone, Prairie du Chien Group, and Jordan Sandstone)

Lower geologic unit (Tunnel City Group, Wonewoc Sandstone, Eau Claire Formation, and Mt. Simon Sandstone)

940

940

Fractured aquitard (St. Lawrence Formation and Eau Claire Formation)

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