|
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. |
|
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 |
| |
|
