# Chemistry

This page last updated: 09/16/2024
Metadata created using Minnesota Geographic Metadata Guidelines

Go to Section:

1. Overview
2. Data Quality
3. Data Organization
4. Coordinate System
5. Attributes
6. Distribution - Get Data
7. Metadata Reference

## Section 1: Overview

Originator:Minnesota Department of Natural Resources
Title: Chemistry
Abstract: Chemistry data include samples collected from wells and surface water by DNR staff, and historical data from earlier studies. Chemical parameters analyzed include the following: major cations and anions, trace elements, field parameters, tritium, stable isotopes of hydrogen and oxygen, and carbon-14.
Purpose: Dodge County Groundwater Atlas, Part B
Time Period of Content Date:
Currentness Reference: Data originated 1991–2020
Progress: Complete
Maintenance and Update Frequency: None Planned
Spatial Extent of Data: Dodge County, Minnesota
Bounding Coordinates: -93.046
-92.678
44.197
43.847
Place Keywords: Dodge County, Minnesota
Theme Keywords: groundwater, water chemistry, residence time, stable isotopes, wells
Theme Keyword Thesaurus: None
Access Constraints: None
Use Constraints: Users may wish to verify critical information; sources include both the references here 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.
Contact Person Information: Holly Johnson, GIS Specialist
Minnesota Department of Natural Resources
500 Lafayette Rd
St. Paul, MN 55155-4025
Phone: 651-259-5693
Email: holly.je.johnson@state.mn.us
Browse Graphic: None available
Associated Data Sets: Dodge County Geologic Atlas, Part A, published by the Minnesota Geological Survey (MGS). More information and downloadable data for Part A available on the MGS site: http://www.mngs.umn.edu/county_atlas/countyatlas.htm

## Section 2: Data Quality

Attribute Accuracy: 1:100,000
Logical Consistency: Data are topologically correct using ArcGIS Pro 3.1.2
Completeness: Complete
Horizontal Positional Accuracy:
Lineage: This file primarily contains well locations and associated inorganic and isotope chemistry sample analyses for wells sampled for this project. Data also include surface water samples. Some data are available in table format only (chemistry_other).
Chemistry data are stored in EQuIS database maintained by the MPCA and in a database managed by the Minnesota Department of Health. Chemistry data are available upon request.

## Section 3: Spatial Data Organization (not used in this metadata)

## Section 4: Coordinate System

Horizontal Coordinate Scheme: Universal Transverse Mercator
UTM Zone Number: 15
Horizontal Datum: NAD83
Horizontal Units: meters
Vertical Datum:
Vertical Units:
Depth Datum:
Depth Units:

## Section 5: Attributes

Overview:
Detailed Citation:
Table Detail:

dodge_chemistry
Field Name | Valid Values | Definition | Definition Source
--- | --- | --- | ---
Relateid | - | Four 0s followed by 6-digit unique number for wells, or the Lake ID from DNR Lakes Database + 2 digits for a site at a lake (01, 02, etc.) |
AQUIFER | - | County Well Index aquifer code |
AQUIFER_Q | - | Quaternary aquifer name, usually mapped at county scale. Quaternary aquifers are named after surficial and buried sand units shown on Plate 4, Part A. |
XSEC | - | Cross section number associated with well, letter indicates published hydrogeologic cross section shown on Part B |
TRITIUM | - | Tritium in tritium units (TU) |
TRIT_AGE | enumerated | Residence time estimated from tritium value |
| modern | Water entered the ground after 1953 |
| mixed | Water is a mixture of modern and premodern |
| mostly premodern | Water entered the ground before 1953 but may contain a small amount of modern water |
| premodern | Water entered the ground before 1953 |
C14_YEARS | - | Groundwater residence time in years, estimated by carbon-14 isotope analysis |
CHLORIDE | - | Chloride concentration in parts per million |
BROMIDE | - | Bromide concentration in parts per million |
CL_BR | - | Chloride/bromide ratio |
NITRATE_N | - | Nitrate concentration in parts per million, reported as Nitrogen |
DEUTERIUM | - | Deuterium (permil) |
OXYGEN_18 | - | Oxygen-18 (permil) |
ARSENIC | - | Arsenic in parts per billion |
MANGANESE | - | Manganese in parts per billion |
DATASOURCE | - | Source of data |
PROJECT | - | Project for which the data were collected |
SITETYPE | - | Type of site where water sample was collected |
CL_SOURCE | enumerated | Chloride source. Samples at or above 5 ppm chloride were assigned a source using the chloride/bromide ratio as a screening tool. |
| Anthropogenic | CL/BR ratio is greater than or equal to 300 |
| Natural | CL/BR ratio is less than 300 |
| Anthro_Likely | No CL/BR ratio available, but high chloride value and shallow well depth strongly suggest an anthropogenic source |
GW_CONDITION | enumerated | Groundwater conditions were assigned to samples to explain how water traveled to an aquifer when the tritium age of a sample did not match the modeled pollution sensitivity rating. |
| L | Lateral flow: aquifer may have received lateral recharge from upgradient areas of higher pollution sensitivity |
| U | Unknown: neither the pollution sensitivity model nor groundwater conditions explained the presence of mixed or modern tritium-age water |

## Section 6: Distribution

Publisher: Minnesota Department of Natural Resources, Ecological and Water Resources Division
Publication Date: 09/16/2024
Contact Person Information: Holly Johnson, GIS Specialist
Minnesota Department of Natural Resources
500 Lafayette Rd
St. Paul, MN 55155-4025
Phone: 651-259-5693
Email: holly.je.johnson@state.mn.us
Distributor's Data Set Identifier:
Distribution Liability: These data were prepared from publicly available information only. Every reasonable effort has been made to ensure the accuracy of the factual data on which these files are 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 here and information on file in the offices of the Department of Natural Resources.
Ordering Instructions: Download zip file of metadata and feature classes by clicking "I AGREE" below.
PDFs of the County Groundwater Atlas can be downloaded at: http://www.dnr.state.mn.us/waters/groundwater_section/mapping/status.html
Online Linkage: I AGREE to the notice in "Distribution Liability" above. Clicking to agree will either begin the download process, link to a service, or provide more instructions. See "Ordering Instructions" above for details.

## Section 7: Metadata Reference

Metadata Date: 09/16/2024
Contact Person Information: Holly Johnson, GIS Specialist
Minnesota Department of Natural Resources
500 Lafayette Rd
St. Paul, MN 55155-4025
Phone: 651-259-5693
Email: holly.je.johnson@state.mn.us
Metadata Standard Name: Minnesota Geographic Metadata Guidelines
Metadata Standard Version: 1.2
Metadata Standard Online Linkage: http://www.mngeo.state.mn.us/committee/standards/mgmg/metadata.htm

This page last updated: 09/16/2024
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