hydrogeologic cross sections, plate 8, geologic atlas of ... · 18,000 800 825 850 swan lake us hwy...
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94°30' W.
94°45' W.
94°15' W.
94° W.
44°15' N.
44°22'30" N.
NorthMankato
NicolletCourtland
Lafayette
St. Peter
)
169
14
14
99
)22
111
15
422
169
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)
)
)
Fort RidgelyState Park
E
F F’
E’
B’
A A’
B
C
D D’
C’
E
F
E’
F’
D’
B’
A A’
B
C
D
C’
Symbols
Part B line of cross section shown on this plateWell used to generate cross section
A A’
Part A line of cross sectionA A’
1 0 1 2 3 4
SCALE 1:300 000
1 0 1 2 4 5 6 7 83 9 KILOMETERS
5 MILES
_j
g1
g2
p_u
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et
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_tc lower
lh
ttmt
sg2 g1
uh
tt
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ups
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25
24,000
Nor
th M
anka
to
US
Hw
y 14
Min
neso
ta R
iver
1461.41
Recharge zone
F
1050
1100
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Ele
vatio
n (fe
et)
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F’
ups
etg2
sg1
sm
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stmt
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mt
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18
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44.2
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18,000
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Sev
en M
ile C
reek
US
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ake
Nic
olle
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Sw
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ake
Out
let
Min
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ta R
iver
Min
neso
ta R
iver
<500
E
1050
1100
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Ele
vatio
n (fe
et)
1050
1100
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450
400
350
E’
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mt
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17.6
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7.81
13.8
189
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790
900
850
775
800
825
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850875
800
875 900
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Hey
man
s C
reek
Sw
an L
ake
Mid
dle
Lake
St.
Pet
er
Min
neso
ta R
iver
Min
neso
ta R
iver
Recharge zoneRecharge zone
D
1050
1100
1000
950
900
850
800
750
700
650
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550
500
450
400
350
Ele
vatio
n (fe
et)
1050
1100
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550
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450
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350
D’
ss
stsg2
tt
vt
ups
sm
sg2g2
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22,000
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16522.8
6.4191204
18201670
800
825
775
800 750
Sta
te H
wy
111
Min
neso
ta R
iver
Sta
te H
wy
15
Sta
te H
wy
22
Min
neso
ta R
iver
St.
Pet
er
Eric
kson
Lak
e
Recharge zone
C
1050
1100
1000
950
900
850
800
750
700
650
600
550
500
450
400
350
Ele
vatio
n (fe
et)
1050
1100
1000
950
900
850
800
750
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650
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550
500
450
400
350
C’
sh
uh
p_u
st
ss
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sm
sv
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ups
ups
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vt
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sm
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ups
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19.5216
140
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860 152
4000
7000 775
800
825
800
Sta
te H
wy
15
Min
neso
ta R
iver
Sta
te H
wy
111
Min
neso
ta R
iver
Sta
te H
wy
22
Eig
ht M
ile C
reek
Recharge zone
B
1050
1100
1000
950
900
850
800
750
700
650
600
550
500
450
400
350
Ele
vatio
n (fe
et)
1050
1100
1000
950
900
850
800
750
700
650
600
550
500
450
400
350
B’
_esge
suug3sge
lh
g2
_tcups
sh
_slg3
sh
g1sg2
lh
g2
ssg2
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uhuh
sm
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ups
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suug1
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tt
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st
ups
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ups
p_u
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9.9
3114907
19.3
570
9701150
25.6
875
800
900
775
875
825
850
825
Sta
te H
wy
4M
inne
sota
Riv
er
Cle
ar L
ake
Sta
te H
wy
22
Lafa
yette
Littl
e R
ock
Cre
ek
Min
neso
ta R
iver
_tc lower
A
1050
1100
1000
950
900
850
800
750
700
650
600
550
500
450
400
350
Ele
vatio
n (fe
et)
1050
1100
1000
950
900
850
800
750
700
650
600
550
500
450
400
350
A’
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
_j
Op
_e
_tc lower
_w
_tc
_sl
p_u
Kd
Ka
Kr
_m
mt, ttg2, lh, vtbt, g1, uh, et
>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
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