Major Bedrock Aquifers Within 300 Feet of Ground Surface

Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Spatial_Reference_Information
• Entity_and_Attribute_Information
• Distribution_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: Miller, Jerry

Publication_Date: 1994

Title: Major Bedrock Aquifers Within 300 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_300_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 300 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 300 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 0.008. 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 (aqmb300) 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:

Contact_Person_Primary:

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: 84

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