# AQBDSNPY

This page last updated: 05/02/2016
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: AQBDSNPY
Abstract: Buried sand and gravel aquifer and bedrock surface pollution sensitivity in Blue Earth County, Minnesota
Purpose: Blue Earth County Geologic Atlas, Part B, County Geologic Atlas Series C-26
Time Period of Content Date:
Currentness Reference: data was acquired or accessed between 2011 and 2012
Progress: Complete
Maintenance and Update Frequency: None Planned
Spatial Extent of Data: Blue Earth County, Minnesota
Bounding Coordinates: -94.4
-93.8
44.3
43.8
Place Keywords: Blue Earth County, Minnesota
Theme Keywords: pollution sensitivity, buried sand and gravel aquifer, bedrock surface
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: Blue Earth County Geologic Atlas, Part A, County Geologic Atlas Series C-26, published by the Minnesota Geological Survey (MGS), 2012. More information and downloadable data for Part A is available on the MGS data 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 10.2.2
Completeness: Complete
Horizontal Positional Accuracy: file was snapped to Part A raster btgd_be (bedrock topographic surface)
Vertical Positional Accuracy: NA
Lineage: Sensitivity calculations were made for the top of each buried sand and gravel aquifer by comparing it to the deepest recharge surface. The elevation of the top of the buried sand and gravel aquifers are from the top of the buried sand and gravel units published with the elevation data in Part A. The top of the bedrock is from the bedrock topography data from Part A that was provided by the MGS.
Recharge surfaces were calculated using a vertical recharge model from the land surface down to each mapped buried sand and gravel aquifer, starting with the stratigraphically shallowest sand and gravel aquifer and ending with the stratigraphically deepest sand and gravel aquifer and the top of the bedrock surface. In Blue Earth County there are eight units to consider in the sensitivity calculations, seven buried sand and gravel aquifers and the top of the bedrock surface.
The pollution sensitivity maps are based on the concept of mapping focused recharge areas where surface water can rapidly movement downward therough interconnected sand and gravel layers. The fine-grained sediment between aquifers is assumed to act as an aquitard that restricts the vertical movement of groundwater between aquifers. This GIS based method is called "recharge surfaces" and is described in the report in the section on Pollution Sensitivity, Buried and bedrock aquifers.
Raster calculator within Arcmap 10.2 was used to create the recharge surfaces. Rasters were reclassified and converted to polygons.

## 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:

AQBDSNPY - Pollution sensitivity of buried sand and gravel aquifers and the top of bedrock surface
Field Name | Valid Values | Definition | Definition Source
--- | --- | --- | ---
AQUIFER_Q | - | Buried sand and gravel aquifer or bedrock aquifer code. The aquifers are identified as either "bdrk", "s2", "se", "sg", "sh", "sm", "st", and "su" |
RATING | - | "VH" is very high, "H" is high, "M" is moderate, "L" is low, "VL" is very low |

## Section 6: Distribution

Publisher: Minnesota Department of Natural Resources, Ecological and Water Resources Division
Publication Date: 05/02/2016
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: AQBDSNPY
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 Minnesota Geological Survey and the 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.
Ordering Instructions: Download zip file of metadata and feature classes by clicking "I AGREE" below.
PDFs of the Blue Earth County Geologic Atlas can be downloaded at: http://www.dnr.state.mn.us/waters/programs/gw_section/mapping/platesum/bluecga.html
Online Linkage: None available

## Section 7: Metadata Reference

Metadata Date: 05/02/2016
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: 05/02/2016
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