Major Bedrock Aquifers Within 500 Feet of Ground Surface

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Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: Miller, Jerry
Publication_Date: 1994
Title: Major Bedrock Aquifers Within 500 Feet of Ground Surface
Edition: 20040401
Geospatial_Data_Presentation_Form: vector digital data
Series_Information:
Series_Name: ISGS GIS Database
Issue_Identification: GISDB_HYDRO.IL_Maj_Bedrock_Aq_Lt_500_Ft_Py
Publication_Information:
Publication_Place: Champaign, Illinois
Publisher: Illinois State Geological Survey
Online_Linkage: <http://www.isgs.illinois.edu/>
Online_Linkage: <http://illinois.edu>
Description:
Abstract:
This map shows the distribution of major bedrock aquifer units within 500 feet of ground surface in Illinois. Major aquifers are capable of yielding 70 gallons of water per minute. Potable water contains less than 2,500 milligrams per liter of total dissolved solids. Bedrock aquifers within 500 feet of ground surface cover most of northern Illinois and are commonly overlain only by thin layers of less permeable silts and clays. Many are directly overlain by shallow or major sand and gravel aquifers allowing direct hydrologic communication with shallower aquifer systems. Stratigraphic units considered to be major bedrock aquifers are:

Hunton Limestone Megagroup Ancell Group Prairie du Chien Group Ironton-Galesville Sandstone Elmhurst-Mt. Simon Sandstone

The scale of these data is 1:500,000.

Purpose:
This feature class is intended to identify areas of Illinois where major bedrock aquifers exist.

These data are appropriate for use in regional thematic analysis. The data are not appropriate as a geodetic, legal or engineering base. The datasets were not and are not intended as a substitute for surveyed locations, such as can be determined by a registered Public Land Surveyor. Although useful in a GIS, the data have no legal basis in the definition of boundaries or property lines.

Supplemental_Information:
In April 2004 the source coverage was transitioned to storage in an Oracle RDBMS using the ArcSDE geodatabase model. The result (this version) is designated edition 20040401.

The source coverage (edition 2.0) was entirely reconstructed from the source hand-drafted map, making the previous version (coverage edition 1.0) obsolete. This edition retains the edition 2.0 data.

Some information used to compile this map was obtained from well log data on file at the Illinois State Geological and Water Surveys. A variety of well/boring data were used, including:

water wells oil wells (active and abandoned) gas wells (active and abandoned) Secondary and Tertiary oil recovery wells air injection wells service wells waste disposal wells observation wells (disposal sites) observation wells (water resources) gas storage operational wells water test holes coal test holes mineral test holes structure test holes stratigraphic test holes engineering test holes

Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1986
Currentness_Reference: publication date of sources
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -91.4244
East_Bounding_Coordinate: -87.3840
North_Bounding_Coordinate: 42.4951
South_Bounding_Coordinate: 36.9540
Keywords:
Theme:
Theme_Keyword_Thesaurus: none
Theme_Keyword: aquifer
Theme_Keyword: groundwater
Theme_Keyword: water
Theme_Keyword: hydrology
Theme_Keyword: hydrogeology
Theme_Keyword: bedrock
Place:
Place_Keyword_Thesaurus: none
Place_Keyword: Illinois
Access_Constraints:
ISGS information must be obtained directly from the ISGS or from an authorized distributor. Be aware that ISGS information obtained from an unauthorized third party may have been altered subsequent to original distribution, or may no longer be current.

Any access to these data, Web sites, computer systems, electronic services, and electronic networks is governed by University and campus policies, in particular, but not limited to, the Policy on Appropriate Use of Computers and Network Systems at the University of Illinois at Urbana-Champaign, the ISGS Terms of Use document available at the ISGS Web site, and the University of Illinois Web Privacy Notice.

Links to these are provided in the Cross References section.

Use_Constraints:
ISGS information is the property of and copyrighted by the Board of Trustees of the University of Illinois with all rights reserved.  University copyright policy is stated in the General Rules Concerning University Organization and Procedure, Article III, Section 4. A link is provided in the Cross References section.

Individuals or entities may make fair use of copyrighted ISGS material, such as reproducing a single figure or table, or using a brief text quotation, without obtaining formal permission, but in all cases the Illinois State Geological Survey must be credited as the source of the material. To reproduce ISGS information beyond the fair use standard, permission must be obtained from the ISGS Information Office, 615 East Peabody Drive, Champaign, Illinois 61820, 217-333-4747, isgs@isgs.illinois.edu. License fees and a license agreement may be required, depending on the proposed usage.

Any use of these data is governed by University and campus policies, in particular, but not limited to, the Policy on Appropriate Use of Computers and Network Systems at the University of Illinois at Urbana-Champaign, the ISGS Terms of Use document available at the ISGS Web site, and the University of Illinois Web Privacy Notice. Links to these are provided in the Cross References section.

Map information is to be used at a scientifically and cartographically appropriate scale, that is, at a scale no greater than indicated on the map or as described in the documentation of the map or map data.  Map information is not appropriate for, and is not to be used as, a geodetic, legal, or engineering base. Map information has no legal basis in the definition of boundaries or property lines and is not intended as a substitute for surveyed locations such as can be determined by a registered Public Land Surveyor.

The data do not replace the need for detailed site-specific studies.

Point_of_Contact:
Contact_Information:
Contact_Instructions: Please refer to the Distribution Information section.
Native_Data_Set_Environment: ArcSDE 9.1 on Oracle 10g
Cross_Reference:
Citation_Information:
Title: ISGS Terms of Use
Online_Linkage: <http://www.isgs.illinois.edu>
Cross_Reference:
Citation_Information:
Title: University of Illinois Web Privacy Notice
Online_Linkage: <http://www.vpaa.uillinois.edu/policies/web_privacy.cfm>
Cross_Reference:
Citation_Information:
Title:
University Copyright Policy (stated in the General Rules Concerning University Organization and Procedure, Article III, Section 4)
Online_Linkage: <http://www.uillinois.edu/trustees/rules.cfm#sec34>
Cross_Reference:
Citation_Information:
Title:
Policy on Appropriate Use of Computers and Network Systems at the University of Illinois at Urbana-Champaign
Online_Linkage: <http://www.fs.uiuc.edu/cam/CAM/viii/viii-1.1.html>

Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
Attributes were extracted from source hand-drafted maps in 1994 and verified by three individuals. Attribute codes are believed to fully representative of the source data. Source data were derived through contouring and interpretation.
Logical_Consistency_Report:
When in coverage format, this data set was checked for complete chain-node topology (no dangling arcs, except where appropriate), polygon labels (one per polygon, except for universal polygon), boundary values appropriate for map projection and map units, and appropriate "fuzzy" tolerances. There are no known polygon attribute values outside the appropriate value domains.
Completeness_Report:
This data set contains major bedrock aquifers as defined in the abstract. There exist other aquifers (associated with other geologic formations or aquifer definitions) not identified on this map. Some examples are sand and gravel aquifers, shallow aquifers, and other aquifers between 50 and 300 feet that are not identified as "major aquifers". Because these data are generalized over a large areal extent, the user needs a good working knowledge of the geologic formations used here in order to derive valid and useful interpretations.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
Horizontal positional accuracy of this data with respect to the source maps was verified by three individuals by visual comparison (manual overlay) of source maps and hard-copy plots. Arcs within one line-width of source mylars were deemed acceptable. Consult the sources for information on the derivation of aquifer boundaries.
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: Miller, J.R., R.C. Berg, T.M. Johnson, A. Wehrmann
Publication_Date: 1985 (not published)
Title:
Siting a Low-Level Radioactive Waste Disposal Facility in Illinois: Statewide Criteria - Description of maps: Compilation, Database, and Intended Use.
Geospatial_Data_Presentation_Form: unpublished report
Publication_Information:
Publication_Place: Champaign, Illinois
Publisher: Illinois State Geological Survey
Other_Citation_Details: ISGS internal document
Type_of_Source_Media: paper
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1985
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: none
Source_Contribution: attribute and data description
Source_Information:
Source_Citation:
Citation_Information:
Originator: Berg, R.C., and J.P. Kempton
Publication_Date: 1984
Title:
Potential for contamination of shallow aquifers by land burial of municipal wastes
Series_Information:
Series_Name: Illinois State Geological Survey Map
Issue_Identification: same as title
Publication_Information:
Publication_Place: Champaign, Illinois
Publisher: Illinois State Geological Survey
Source_Scale_Denominator: 500000
Type_of_Source_Media: paper
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1984
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: none
Source_Contribution: unknown
Source_Information:
Source_Citation:
Citation_Information:
Originator: Bergstrom, R.E., K. Cartwright, K. Piskin, and M.R. McComas
Publication_Date: 1968
Title:
Groundwater resources of the Quaternary deposits of Illinois; in the Quaternary of Illinois - a symposium in observance of the centennial of the University of Illinois
Publication_Information:
Publication_Place: Champaign, Illinois
Publisher: Illinois State Geological Survey
Other_Citation_Details: Bergstrom, R.E. (ed.); p. 157-159
Type_of_Source_Media: paper
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1984
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: none
Source_Contribution: unknown
Source_Information:
Source_Citation:
Citation_Information:
Originator: Bergstrom, R.E., and A.J. Zeizel
Publication_Date: 1957
Title:
Ground-water geology in western Illinois, south part - A preliminary geologic report
Series_Information:
Series_Name: Illinois State Geological Survey Circular
Issue_Identification: 232
Publication_Information:
Publication_Place: Champaign, Illinois
Publisher: Illinois State Geological Survey
Type_of_Source_Media: paper
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1957
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: none
Source_Contribution: unknown
Source_Information:
Source_Citation:
Citation_Information:
Originator: Kempton, J.P., W.H. Johnson, P.C. Heigold, and K. Cartwright
Publication_Date: 1991
Title:
Mahomet bedrock valley in east-central Illinois; topography, glacial drift stratigraphy, and hydrology
Series_Information:
Series_Name: Geological Society of America Special Paper
Issue_Identification: 258
Type_of_Source_Media: paper
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1991
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: none
Source_Contribution: unknown
Source_Information:
Source_Citation:
Citation_Information:
Originator: Pryor, W.A.
Publication_Date: 1956
Title:
Groundwater geology in southern Illinois - A preliminary geologic report
Series_Information:
Series_Name: Illinois State Geological Survey Circular
Issue_Identification: 212
Publication_Information:
Publication_Place: Champaign, Illinois
Publisher: Illinois State Geological Survey
Type_of_Source_Media: paper
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1956
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: none
Source_Contribution: unknown
Source_Information:
Source_Citation:
Citation_Information:
Originator: Selkregg, L.F., and J.P. Kempton
Publication_Date: 1957
Title:
Groundwater geology in south-central Illinois - A preliminary geologic report
Series_Information:
Series_Name: Illinois State Geological Survey Circular
Issue_Identification: 225
Publication_Information:
Publication_Place: Champaign, Illinois
Publisher: Illinois State Geological Survey
Type_of_Source_Media: paper
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1957
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: none
Source_Contribution: unknown
Source_Information:
Source_Citation:
Citation_Information:
Originator: Selkregg, L.F., and J.P. Kempton
Publication_Date: 1958
Title:
Groundwater geology in east-central Illinois - A preliminary geologic report
Series_Information:
Series_Name: Illinois State Geological Survey Circular
Issue_Identification: 248
Publication_Information:
Publication_Place: Champaign, Illinois
Publisher: Illinois State Geological Survey
Type_of_Source_Media: paper
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1958
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: none
Source_Contribution: unknown
Source_Information:
Source_Citation:
Citation_Information:
Originator: Visocky, A.P., M.G. Sherrill, and K. Cartwright
Publication_Date: 1985
Title:
Geology, hydrology, and water quality of the Cambrian and Ordovician systems in northern Illinois
Series_Information:
Series_Name:
Illinois State Geological Survey Cooperative Groundwater Resources Report
Issue_Identification: 10
Publication_Information:
Publication_Place: Champaign, Illinois
Publisher: Illinois State Geological Survey
Type_of_Source_Media: paper
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1985
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: none
Source_Contribution: unknown
Source_Information:
Source_Citation:
Citation_Information:
Originator:
Willman, H.B., E. Atherton, T.C. Buschback, C. Collinson, J.C. Frye, M.E. Hopkins, J.A. Lineback, and J.A. Simon
Publication_Date: 1975
Title: Handbook of Illinois stratigraphy
Series_Information:
Series_Name: Illinois State Geological Survey Bulletin
Issue_Identification: 95
Publication_Information:
Publication_Place: Champaign, Illinois
Publisher: Illinois State Geological Survey
Type_of_Source_Media: paper
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1975
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: none
Source_Contribution: unknown
Process_Step:
Process_Description:
This coverage was originally digitized in ARC/INFO circa 1985 from hand-drafted map compiled by Jerry Miller of the ISGS. The map is pencil on paper in good condition, at a scale of 1:500,000.
Process_Date: 1985
Process_Step:
Process_Description:
In 1994 the coverage underwent extensive Quality Assurance/ Quality Control review. As a result of the QA/QC review, the existing coverage was replaced. The new coverage was digitized from the original paper map, with a maximum RMS of 0.004. The .PAT ITEMS and values were copied from the existing coverage and then manually verified. This processing was subsequently reviewed and verified by ISGS staff.
Process_Date: 1994
Process_Step:
Process_Description:
Source coverage (aqmb500) converted to double precision and reprojected to GCS_NAD83 using Workstation ArcInfo 7.2.1.

The features were imported into the ISGS SDE enterprise database following steps outlined in ISGS procedure GISDB_0009.

Attribute COUNT-FED-FIPS was dropped. It was an unnecessary item leftover from previous processing.

Metadata updated.

Process_Date: 20040401
Process_Contact:
Contact_Information:

Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: G-polygon
Point_and_Vector_Object_Count: 71

Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Geographic:
Latitude_Resolution: 0.000001
Longitude_Resolution: 0.000001
Geographic_Coordinate_Units: Decimal degrees
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1983
Ellipsoid_Name: Geodetic Reference System 80
Semi-major_Axis: 6378137.000000
Denominator_of_Flattening_Ratio: 298.257222
Vertical_Coordinate_System_Definition:
Altitude_System_Definition:

Entity_and_Attribute_Information:
Overview_Description:
Entity_and_Attribute_Overview:
Attribute items are in typical SDE feature class format. Those requiring explanation are:

CODE - Discriminates polygon on basis of water quality 0 - Major bedrock aquifer absent 1 - Major bedrock aquifer present


Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:
Information Office, Illinois State Geological Survey (ISGS), a division of the Institute of Natural Resource Sustainability (INRS) of the University of Illinois
Contact_Address:
Address_Type: mailing and physical address
Address: 615 East Peabody Drive
City: Champaign
State_or_Province: Illinois
Postal_Code: 61820
Country: USA
Contact_Voice_Telephone: 217-333-4747
Contact_TDD/TTY_Telephone: 217-785-0211
Contact_Electronic_Mail_Address: isgs@isgs.illinois.edu
Hours_of_Service: 8:00 a.m. - 4:30 p.m., Monday-Friday, U.S. Central Time
Distribution_Liability:
Refer to the Legal Notices of Terms and Conditions of the University of Illinois Web Privacy Policy (there is a link in the Cross References section) for policy statements regarding the following:

Disclaimer of Liability Disclaimer of Warranties and Accuracy of Data Disclaimer of Endorsement Disclaimer for External Links Disclaimer of Duty to Continue Provision of Data Security Choice of Law

By obtaining these data you agree to the provisions of the University of Illinois Web Privacy Policy, regardless of the manner in which the information was obtained.

Technical_Prerequisites:
The data are intended for use with GIS software. The ISGS uses ESRI ArcGIS software, however, ESRI formats can be imported into many different GIS software packages. It is expected that customers who obtain these data have the technical expertise to use GIS software. The ISGS does not provide software support of any kind.

Metadata_Reference_Information:
Metadata_Date: 20090224
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Instructions: Please refer to the Distribution Information section.
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time
Metadata_Access_Constraints:
The access constraints as stated for the data apply also to the metadata. Refer to the Access Constraints section of the Identification Information section.
Metadata_Use_Constraints:
The use constraints as stated for the data apply also to the metadata. Refer to the Use Constraints section of the Identification Information section.
Metadata_Extensions:
Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>
Profile_Name: ESRI Metadata Profile

Illinois Natural Resources Geospatial Data Clearinghouse

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