|
Section 1 | Identification Information - - - - - - top |
Originator | Minnesota DNR Division of Ecological and Water Resources - County Geologic Atlas and Regional Hydrogeologic Assessment Program |
Title | AQBDSNPY |
System Name | |
Abstract | Buried aquifer and bedrock surface pollution sensitivity in McLeod County, Minnesota |
Purpose | County Geologic Atlas and Regional Hydrogeologic Assessment Program,
McLeod County Geologic Atlas, Part B, County Geologic Atlas Series C-20 |
Time Period of Content Date | 2012 |
Currentness Reference | Publication date |
Progress | Complete |
Maintenance and Update Frequency | None Planned |
Spatial Extent of Data | McLeod County, Minnesota |
Bounding Coordinates | East | -93.8 | West | -94.3 | North | 45.8 | South | 45.6 |
|
Place Keywords | Minnesota, McLeod County |
Theme Keywords | Pollution sensitivity, buried 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 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 | McLeod County Geologic Atlas, Part A, County Geologic Atlas Series C-20, published by the Minnesota Geological Survey, 2009. More information and downloadable data for Part A available on the MGS data site. |
|
Section 2 | Data Quality Information - - - - - - top |
Attribute Accuracy | |
Logical Consistency | Data are topologically correct using ArcGIS 10.0 |
Completeness | Complete |
Horizontal Positional Accuracy | unknown |
Vertical Positional Accuracy | not applicable |
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 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 McLeod County there are seven units to consider in a sensitivity calculation, the six buried sand and gravel aquifers and the top of the bedrock surface.
The pollution sensitivity maps are primarily based on the depth to the top of the mapped aquifers. Plate 5, Part A includes maps of the depth to the top of the buried sand and gravel aquifers. Plate 6, Part A includes a map of the depth to the bedrock surface. The fine-grained sediment between aquifers is assumed to act as an aquitard that restricts the vertical movement of groundwater between aquifers. Plate 9 has a complete description of the development of the sensitivity model.
The sensitivity rating matrix, based on the thickness of the protective layer between the aquifer unit and the nearest overlying recharge surface, is described in Figure 5, Plate 9. 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 | 300000 |
|
Section 3 | Spatial Data Organization Information - - - - - - top |
Native Data Set Environment | ArcGIS 10.0 |
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_Q | Buried aquifer or bedrock aquifer code. The aquifers are identified as either "BDRK", "SDV", "SDJ", "SC", "SB", "SX", or "SU". |
|
|
Section 6 | Distribution Information - - - - - - top |
Publisher | Minnesota DNR Division of Ecological and Water Resources |
Publication Date | 2013 |
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:
McLeod County Geologic Atlas, Part B: Metadata for GIS and Digital Data |
Online Linkage | McLeod County Geologic Atlas, Part B: Metadata for GIS and Digital Data |
|
Section 7 | Metadata Reference Information - - - - - - top |
Metadata Date | 2013-08-20 |
Contact Person Information | GIS Specialist, Atlas/Assessment Program
Minnesota DNR - Division of Division of Ecological and Water Resources
500 Lafayette Road
Saint Paul, MN 55155
Phone: (651) 259-5669 or (651) 259-5700
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 |
| |
|
