County Geologic Atlas Program


Todd County Geologic Atlas Part B

AQBDSNPY metadata

Sensitivity to Pollution of the Buried Aquifers


Minnesota DNR Waters
County Geologic Atlas and Regional Hydrogeologic Assessment Program

Description of data created for Todd County Geologic Atlas, Part B
County Geologic Atlas Series C-18

Metadata created using Minnesota Geographic Metadata Guidelines version 1.2
Metadata content prepared 2010-12-02


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

Originator

Minnesota DNR Waters - County Geologic Atlas and Regional Hydrogeologic Assessment Program

Title

AQBDSNPY

 

System Name

 

Abstract

Buried aquifer pollution sensitivity in Todd County, Minnesota

 

Purpose

County Geologic Atlas and Regional Hydrogeologic Assessment Program,
Todd County Geologic Atlas, Part B, County Geologic Atlas Series C-18

Time Period of Content Date

November, 2010

Currentness Reference

Publication date

Progress

Complete

Maintenance and Update Frequency

None Planned

Spatial Extent of Data

Todd County, Minnesota

Bounding Coordinates

East

-94.6

West

-95.2

North

46.4

South

45.8

 

Place Keywords

Minnesota, Todd County

Theme Keywords

Pollution sensitivity, buried aquifer

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 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

See Metadata Reference Information section, below

Browse Graphic File Name

 

Browse Graphic File Description

 

Associated Data Sets

Todd County Geologic Atlas, Part A, County Geologic Atlas Series C-18, published by the Minnesota Geological Survey, 2007. More information and downloadable data for Part A available on the MGS ftp site.The preceeding link is to a non-DNR site

 

Section 2

Data Quality Information - - - - - - top

Attribute Accuracy

 

Logical Consistency

Data are topologically correct using ArcGIS 9.3

Completeness

Complete

Horizontal Positional Accuracy

unknown

Vertical Positional Accuracy

not applicable

Lineage

This file represents the thickness between the top of each aquifer and the base of the nearest overlying recharge surface. A description of recharge surfaces is found in Figure 3, Plate 10.

Sensitivity estimates were created by calculating the vertical distance between the nearest overlying recharge surface and the top of the aquifer. The following grid calculations were used.

The actual sensitivity calculations use the deepest recharge surface. If the deepest recharge surface is below the top of the aquifer, then the distance from the recharge surface to the top of the aquifer is set equal to zero during the calculation. This effectively uses the recharge surface immediately above each aquifer:

C1 AQUIFER
con(([Deepest Recharge Surface] - [Top of C1 aquifer]) < 0, 0, ([Deepest Recharge Surface] - [Top of C1 aquifer]))

H1 AQUIFER
con(([Deepest Recharge Surface] - [Top of H1 aquifer]) < 0, 0, ([Deepest Recharge Surface] - [Top of H1 aquifer]))

If the H1 aquifer sand was more than 100 feet from land surface and the original sensitivity calculation was <= 20 (VH or H), then the sensitivity was set equal to 21, ?M?. The following grid calculation was used: con(([USGS Topo DEM] - [Top of H1 aquifer]) > 100, con([Original H1 sensitivity] <= 20, 21, [Original H1 sensitivity]), [Original H1 sensitivity])

B3 AQUIFER
con(([Deepest Recharge Surface] - [Top of B3 aquifer]) < 0, 0, ([Deepest Recharge Surface] - [Top of B3 aquifer]))

B2 AQUIFER
con(([Deepest Recharge Surface] - [Top of B2 aquifer]) < 0, 0, ([Deepest Recharge Surface] - [Top of B2 aquifer]))

B1 AQUIFER
con(([Deepest Recharge Surface] - [Top of B1 aquifer]) < 0, 0, ([Deepest Recharge Surface] - [Top of B1 aquifer]))

X3 AQUIFER
con(([Deepest Recharge Surface] - [Top of X3 aquifer]) < 0, 0, ([Deepest Recharge Surface] - [Top of X3 aquifer]))

If the X3 aquifer sand was more than 100 feet from land surface and the original sensitivity calculation was <= 20 (VH or H), the sensitivity was set equal to 21. The following grid calculation was used: con(([USGS Topo DEM] - [Top of X3 aquifer]) > 100, con([Original X3 sensitivity] <= 20, 21, [Original X3 sensitivity]), [Original X3 sensitivity])

X2 AQUIFER
con(([Deepest Recharge Surface] - [Top of X2 aquifer]) < 0, 0, ([Deepest Recharge Surface] - [Top of X2 aquifer]))

If the X2 aquifer sand was more than 100 feet from land surface and the original sensitivity calculation was <= 20 (VH or H), the sensitivity was set equal to 21. The following grid calculation was used: con(([USGS Topo DEM] - [Top of X2 aquifer]) > 100, con([Original X2 sensitivity] <= 20, 21, [Original X2 sensitivity]), [Original X2 sensitivity])

X1 AQUIFER
con(([Deepest Recharge Surface] - [Top of X1 aquifer]) < 0, 0, ([Deepest Recharge Surface] - [Top of X1 aquifer]))

If the X1 aquifer sand was more than 100 feet from land surface and the original sensitivity calculation was <= 20 (VH or H), the sensitivity was set equal to 21. The following grid calculation was used: con(([USGS Topo DEM] - [Top of X1 aquifer]) > 100, con([Original X1 sensitivity] <= 20, 21, [Original X1 sensitivity]), [Original X1 sensitivity])

The sensitivity rating model, based on the thickness of the protective layer between the aquifer and the nearest overlying recharge surface, is described in Figure 3 of Plate 10. Sensitivity ratings are applied as follows:

Protective layer thickness

Sensitivity Rating

0 to 10 feet
10 to 20 feet
20 to 30 feet
30 to 40 feet
Greater than 40 feet

Very High
High
Moderate
Low
Very Low

The final raster was converted to a polygon shapefile.

Sensitivity interpretation was based on overlapping estimated time of travel ranges as follows:

Map color

Sensitivity Rating

Time of travel range

Red
Orange
Yellow
Light Green
Dark Green

Very High
High
Moderate
Low
Very Low

Hours to months
Weeks to years
Years to decades
Decades to a century
A century or more

Source Scale Denominator

350000

 

Section 3

Spatial Data Organization Information - - - - - - top

Native Data Set Environment

ArcGIS 9.3

Geographic Reference for Tabular Data

Not Applicable

Spatial Object Type

Vector

Vendor Specific Object Types

polygon

Tiling Scheme

state

 

Section 4

Spatial Reference Information - - - - - - top

Horizontal Coordinate Scheme

UTM

Ellipsoid

GRS1980

Horizontal Datum

NAD83

Horizontal Units

meters

Distance Resolution

meters

Altitude Datum

n/a

Altitude Units

n/a

Depth Datum

n/a

Depth Units

n/a

Cell Width

0

Cell Height

0

Latitude Resolution

0

Longitude Resolution

0

UTM Zone Number

15

SPCS Zone Identifier

0

County Coordinate Zone Identifier

0

Coordinate Offsets or Adjustments

n/a

Map Projection Name

n/a

Map Projection Parameters

n/a

Other Coordinate System's Definition

n/a

 

Section 5

Entity and Attribute Information - - - - - - top

Entity and Attribute Overview

 

Entity and Attribute Detailed Citation

HTML Table (Not Available)

aqbdsnpy

 

 

 

Rating

 

"VH" is very high
"H" is high
"M" is moderate
"L" is low
"VL" is very low

 

Aquifer

Buried aquifer code. The aquifers are identified as either "C1", "H1", "B3", "B2", "B1", "X3", "X2", or "X1".

 

 

Section 6

Distribution Information - - - - - - top

Publisher

Minnesota DNR Waters

Publication Date

2010

Contact Person Information

See Metadata Reference Information section, below

Distributor's Data Set Identifier

aqbdsnpy

Distribution Liability

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 is 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.

Transfer Format Name

shapefile

Transfer Format Version Number

 

Transfer Size

 

Ordering Instructions

Download ArcGIS shapefiles from:
Todd County Geologic Atlas, Part B: Metadata for GIS and Digital Data

Online Linkage

Todd County Geologic Atlas, Part B: Metadata for GIS and Digital Data

 

Section 7

Metadata Reference Information - - - - - - top

Metadata Date

2010-12-02

Contact Person Information

GIS Specialist, Atlas/Assessment Program
Minnesota DNR - Division of Waters
500 Lafayette Road
Saint Paul, MN 55155
Phone: (651) 259-5693
FAX: (651) 296-0445
E-mail:

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

 

 

 

 

 

 

 

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