Ground Water Contamination Susceptibility in Minnesota

This page last updated: 05/27/2009
Metadata created using Minnesota Geographic Metadata Guidelines


Metadata Summary

Originator Minnesota Pollution Control Agency and Land Management Information Center
Abstract A broad, generalized interpretation of ground water contamination susceptibility for the state, based on modeling relying on data inputs from the MLMIS40 (40-acre raster) soils and geology data, with additional geology inputs. This layer is not appropriate for site-specific use.
Browse Graphic none available
Time Period of Content Date 1989
Currentness Reference Model input layers and resulting map were based upon maps and automated data related to soils and geology which were commonly available at the time.
Access Constraints None
Use Constraints This compilation layer should not be used for any site-specific purposes. Local units of government should not base ground water management decisions on this data set or map.

Redistribution Conditions: In obtaining these data from LMIC, it is understood that you and/or your organization have the right to use them for any internal purpose. If you modify them, you should document those changes in a metadata record that should accompany all redistributed data. If you transmit or provide these data in any form to another user, the data MUST be accompanied by a copy of this disclaimer and all documentation provided with the original data set including the full metadata record.
Distributor Organization Land Management Information Center
Ordering Instructions This data set is distributed on the internet by clicking below after Online Linkage. Doing so will tell your browser to start downloading a 'ZIP' file which will contain the following:
- ArcView Shapefile (gwc.shp)
- Metadata (.htm and .xml) files for the dataset
- NOTICE.RTF, an important notice about this data set that can be read by most word processing software, and an ascii text version of the same notice (NOTICE.TXT).

Use any extraction software to unzip the file.
Online Linkage Click here to download data. (See Ordering Instructions above for details.) By clicking here, you agree to the notice in "Distribution Liability" in Section 6 of this metadata.

Full Metadata

Ground Water Contamination Susceptibility in Minnesota

Go to Section:
1. Identification Information
2. Data Quality Information
3. Spatial Data Organization Information
4. Spatial Reference Information
5. Entity and Attribute Information
6. Distribution Information
7. Metadata Reference Information

 
Section 1 Identification Information   Top of page
Originator Minnesota Pollution Control Agency and Land Management Information Center
Title Ground Water Contamination Susceptibility in Minnesota
Abstract A broad, generalized interpretation of ground water contamination susceptibility for the state, based on modeling relying on data inputs from the MLMIS40 (40-acre raster) soils and geology data, with additional geology inputs. This layer is not appropriate for site-specific use.
Purpose The purpose of this project was to design and demonstrate a method of assessing relative susceptibility to ground water contamination in Minnesota, using previously published physical resource data. This methodology employed at the statewide scale is effective in delineating broad areas of varying susceptibility and may be useful in focusing the state regulatory, monitoring, planning, preventive, and education effort. This compilation layer cannot be used for any site-specific purposes. Local units of government should not based ground water management decisions on this data set or map.
Time Period of Content Date 1989
Currentness Reference Model input layers and resulting map were based upon maps and automated data related to soils and geology which were commonly available at the time.
Progress Complete
Maintenance and Update Frequency None planned
Spatial Extent of Data Minnesota, Statewide
Bounding Coordinates -97.5
-89.0
49.5
43.0
Place Keywords Minnesota, Statewide
Theme Keywords geoscientificInformation, Ground Water, Geology, Hydrogeology, Ground Water Contamination Susceptibility, Susceptibility, Sensitivity, Ground Water Sensitivity, Soils, Contamination
Theme Keyword Thesaurus ISO 19115 Topic Category
Access Constraints None
Use Constraints This compilation layer should not be used for any site-specific purposes. Local units of government should not base ground water management decisions on this data set or map.

Redistribution Conditions: In obtaining these data from LMIC, it is understood that you and/or your organization have the right to use them for any internal purpose. If you modify them, you should document those changes in a metadata record that should accompany all redistributed data. If you transmit or provide these data in any form to another user, the data MUST be accompanied by a copy of this disclaimer and all documentation provided with the original data set including the full metadata record.
Contact Person Information Eric Porcher, Hydrogeologist
Minnesota Pollution Control Agency - Region 5
18 Wood Lake Drive SE
Rochester, Minnesota 55904
Phone: 507-285-7290
FAX:
E-mail: eric.porcher@state.mn.us
Browse Graphic none available
Browse Graphic File Description
Associated Data Sets The Ground Water Contamination Susceptibility layer was derived largely from layers in the MLMS40 40-acre raster data set. The raster version of this file and some of the input files are available in EPPL7 format as part of the MGC100, EPIC2000, and Minnesota Environmental Atlas data sets.

Original (project documentation and graphic are viewable at:
http://files.dnr.state.mn.us/waters/groundwater_section/mapping/sensitivity/docs/porcher1989.pdf (large document)
http://www.dnr.state.mn.us/waters/groundwater_section/mapping/gwcontam_susceptibility.html (poster)

DNR's web page on ground water pollution sensitivity and other criteria for estimating sensitivity is viewable at: http://www.dnr.state.mn.us/waters/groundwater_section/mapping/sensitivity.html

More recent, and less generalized maps of ground water sensitivity for many of the state's counties, generally at scales of 1:100,000 or 1:200,000, have been created by the Department of Natural Resources Ground Water Mapping Unit through the county atlas and regional hydrogeologic assessment projects. For more information see:
http://www.dnr.state.mn.us/waters/groundwater_section/mapping/status.html

 
Section 2 Data Quality Information Top of full metadata Top of page
Attribute Accuracy See description of modeling under 'Lineage'.
Logical Consistency
Completeness Complete for the state
Horizontal Positional Accuracy Map resolution (minimum mapping unit) for the coarsest input data layers was 600-640 acres.
Lineage A more complete description of the project which created this layer and the supporting layers is included in the report, Ground Water Contamination Susceptibility in Minnesota (Minnesota Pollution Control Agency,1989), by Eric Porcher, Hydrogeologist, Minnesota Pollution Control Agency.

From the report: 'The parameters that control ground water susceptibility to contamination are quite varied and overlapping, and include: soil media, topography, depth to water, aquifer media, vadose zone materials, net recharge, hydraulic conductivity of aquifer, hydraulic gradient, distance to nearest drinking water supply, depth to bedrock, unsaturated zone permeability and thickness, and net precipitation. The systems that have been developed using some of the aforementioned factors are generally designed for site specific application to known contamination sites and are not useful for a statewide assessment.'

From the report: 'The parameters chosen for this project were aquifer materials, recharge potential, soil materials, and vadose zone materials. These parameters are readily derived using several published maps. The Aquifer Materials map was created by combining the Quaternary Hydrogeology Map with a modified version of the Bedrock Hydrogeology Map of Minnesota. The recharge potential map is a simplification of the Hydrologic Groups from the Minnesota Soil Atlas Data. The Minnesota Soil Atlas was also the source of information for the Soil Materials map. The soils data were created by combining two data sets of the Soil Atlas - rooting zone and substratum, into a generalized soil materials map. Vadose Zone Materials are those which are unsaturated and located just below the soil horizon and above the aquifer materials. The Vadose Zone Materials layer was derived from three existing statewide maps: the Quaternary Geology Map, a modified version of the Bedrock Hydrogeology Map, and the Depth to Bedrock Map, which indicates where the vadose zone is thin or absent.'

MODEL INPUT DATA LAYERS AND SOURCES.

LAYER: SOIL MATERIALS
DESCRIPTION: Generalization of rooting zone and substratum soils from Minnesota Soil Atlas Series
DATA SOURCE/PUBLISHED SCALE: Minnesota Soil Atlas Series, 1969-1981; University of Minnesota Department of Soil Science/Agricultural Experiment Station/USDA-SCS; 1:250,000
MINIMUM MAPPING UNIT: 600 acres
SCALE OF ENCODING: 40 acres
COMMENTS: Data compiled at 1:125,000 scale.

LAYER: RECHARGE POTENTIAL
DESCRIPTION: Derived from Hydrologic Soil Groups, an element from the Minnesota Soil Atlas Series
DATA SOURCE/PUBLISHED SCALE: Minnesota Soil Atlas Series, 1969-1981; University of Minnesota Department of Soil Science/Agricultural Experiment Station/USDA-SCS; 1:250,000
MINIMUM MAPPING UNIT: 600 acres
SCALE OF ENCODING: 40 acres

LAYER NAME: AQUIFER MATERIALS
DATA DESCRIPTION: Derived from Quaternary Hydrogeology, Paleozoic Lithostratigraphy of Southeastern Minnesota, and Bedrock Hydrogeology Maps
DATA SOURCE/ PUBLISHED SCALE: 1. Hydrogeologic Map of Minnesota: Bedrock Hydrogeology (Mn Geological Survey Map S-2), 1:500,000; 2. Paleozoic Lithostratigraphy of Southeast Minnesota (Mn Geological Survey Map M-51, 1:500,000); 3. Hydrogeologic Map of Minnesota, Quaternary Hydrogeology (Mn Geological Survey Map S-3), 1:500,000
MINIMUM MAPPING UNIT: approx. 640 acres
SCALE OF ENCODING: 40 acres
COMMENTS: Original Maps compiled at 1:250,000 scale

LAYER NAME: VADOSE ZONE MATERIALS
DATA DESCRIPTION: Derived from Quaternary Geology, Paleozoic Lithostratigraphy of Southeastern Minnesota, Bedrock Hydrogeology, and Depth to Bedrock maps.
DATA SOURCE/ PUBLISHED SCALE: 1. Hydrogeologic Map of Minnesota: Bedrock Hydrogeology (Mn Geological Survey Map S-2), 1:500,000; 2. Paleozoic Lithostratigraphy of Southeastern Minnesota (Mn Geological Survey Map M-51), 1:500,000; 3. Geologic Map of Minnesota: Quaternary Geology (Mn Geological Survey Map S-1), 1:500,000; 4. Depth to Bedrock (Mn Geological Survey Map S-14, 1:1,000,000.
MINIMUM MAPPING UNIT: approximately 640 acres
SCALE OF ENCODING: 40 acres


MODEL OUTPUT LAYER:

LAYER NAME: GROUND WATER CONTAMINATION SUSCEPTIBILITY IN MINNESOTA (GWC)
DATA DESCRIPTION: Layer derived, based on information from the preceding four layers. Model methodology is described in the publication.
DATA SOURCE/ PUBLISHED SCALE: See above
MINIMUM MAPPING UNIT: See above
SCALE OF ENCODING: 40 Acres


Original model derivation work was done in EPPL6 on the Prime Minicomputer at LMIC. The original report describes the modeling process in more detail. Later data conversions included the following:

1. Conversion from EPPL6 (unprojected) to EPPL7 MGC100 version:
Conversion routine was developed to convert the unprojected EPPL
statewide files into the MGC100 dataset, which was originally UTM Zone 15, NAD27. At a later time all MGC100 data was converted in EPPL7 from NAD27 to NAD83.

2a. Conversion to ARC Coverage:
a. EPPL6 files were converted into arc coverages, UTM Zone 15, NAD27, using the SVF(single variable file) to ARC conversion, and a transformation from unprojected to UTM, Zone 15, NAD27, using a projection file consisting of 50 points statewide.
b. Arc Coverage was later converted from NAD27 to NAD83.

2b. Conversion to ArcView Shapefile:
EPPL7 MGC100 NAD83 file was converted to shapefile using the EPPL32 Export function. Vector file retains the 'stair-step' characteristic of its grid cell origin. The shapefile has a slightly better spatial representation than the coverage version because an improved transformation methodology was used to project it to UTM from the original EPPL6 flat grid file.

Only the final 'GWC' layer is downloadable. Intermediate model layers are not available.
Source Scale Denominator 500000
 
Section 3 Spatial Data Organization Information Top of full metadata Top of page
Native Data Set Environment EPPL7
Geographic Reference for Tabular Data
Spatial Object Type Raster
Vendor Specific Object Types
Tiling Scheme Statewide
 
Section 4 Spatial Reference Information Top of full metadata Top of page
Horizontal Coordinate Scheme UTM
Ellipsoid GRS80
Horizontal Datum NAD83
Horizontal Units Meters
Distance Resolution
Cell Width 100
Cell Height 100
UTM Zone Number 15E
 
Section 5 Entity and Attribute Information Top of full metadata Top of page
Entity and Attribute Overview
Entity and Attribute Detailed Citation EPPL-ID - LEGEND

2 - Insufficient Data to Rank
3 - Lowest Susceptibility
4 - Low Susceptibility
5 - Medium Susceptibility
6 - High Susceptibility
7 - Highest Susceptibility
 
Section 6 Distribution Information Top of full metadata Top of page
Publisher Minnesota Pollution Control Agency
Publication Date 1989
Contact Person Information Susanne Maeder
GIS Data Coordinator
Land Management Information Center
300 Centennial Building; 658 Cedar Street
St. Paul, Minnesota 55155
Phone: 651-201-2488
FAX: 651-296-3698
E-mail: clearing.house@state.mn.us
Distributor's Data Set Identifier gwc
Distribution Liability Limitations: Although extensive effort has been made to produce error free and complete data, all geographic information has limitations due to the scale, resolution, date and interpretation of the original source materials. You should consult available data documentation (metadata) for these particular data to determine their limitations and the precision to which they depict distance, direction, location or other geographic characteristics. These data may be subject to periodic change without prior notification.

No Warranty: These data are provided as is, without any warranty whatsoever, including but not limited to any warranty as to their performance, merchantability, or fitness for any particular purpose.

Liability: The entire risk as to the results of the use of these data is assumed by the user. LMIC is not responsible for any interpretation or conclusions based on these data made by those who acquire or use it. LMIC shall not be liable for any direct, indirect, special, incidental, compensatory or consequential damages or third party claims resulting from the use of these data even if LMIC has been advised of the possibility of such potential loss or damage. In States that do not allow the exclusion or limitation of incidental or consequential damages, you may not use these data.

Data Delivered on Electronic Media: If these data have been requested from LMIC on magnetic media, CD-ROM or any other physical media, LMIC will deliver this product in the computer-readable format agreed upon with the requestor. LMIC will re-issue these data if they are determined unreadable by correctly adjusted computer input devices, or when the medium is delivered in a damaged condition. Requests for re-issue of this digital data product must be made within 30 days of the date shipped from LMIC.
Transfer Format Name ESRI Shapefile
Transfer Format Version Number
Transfer Size 2.4 MB Zipped
Ordering Instructions This data set is distributed on the internet by clicking below after Online Linkage. Doing so will tell your browser to start downloading a 'ZIP' file which will contain the following:
- ArcView Shapefile (gwc.shp)
- Metadata (.htm and .xml) files for the dataset
- NOTICE.RTF, an important notice about this data set that can be read by most word processing software, and an ascii text version of the same notice (NOTICE.TXT).

Use any extraction software to unzip the file.
Online Linkage Click here to download data. (See Ordering Instructions above for details.) By clicking here, you agree to the notice in "Distribution Liability" above.
 
Section 7 Metadata Reference Information Top of full metadata Top of page
Metadata Date 05/27/2009
Contact Person Information Susanne Maeder, GIS Data Coordinator
Land Management Information Center
300 Centennial Building; 658 Cedar Street
St. Paul, Minnesota 55155
Phone: 651-201-2488
FAX: 651-296-3698
E-mail: susanne.maeder@state.mn.us
Metadata Standard Name Minnesota Geographic Metadata Guidelines
Metadata Standard Version 1.2
Metadata Standard Online Linkage http://www.lmic.state.mn.us/gc/stds/metadata.htm


This page last updated: 05/27/2009