Donald A. Keefer, Illinois State Geological Survey 1995 20040413 vector digital data ISGS GIS Database GISDB_HYDRO.IL_Aquifer_Agri_Contam_Potent Champaign, Illinois Illinois State Geological Survey http://www.isgs.illinois.edu/ http://illinois.edu Donald A. Keefer 1995 1995 revision document Environmental Geology 148 Champaign, Illinois, USA Illinois State Geological Survey 28 pages, 2 figures, 5 plates (supersedes OFS 1991-7) This is a statewide SDE feature dataset for evaluating the potential for contamination of shallow aquifers by pesticides and nitrate. The sources of this data set were published and digitized at 1:250,000; however, the soils map and depth to aquifer map (stack-unit map) were generated from source data mapped at 1:15,000 and 1:64,000, respectively. This aquifer sensitivity map was published at 1:500,000 (statewide map), and 1:250,000 (county maps). Nominal scale is 1:250,000. Two statewide data sets were identified as containing information that would be useful for producing aquifer sensitivity maps: a soil association map (and database) and a map of geologic materials to a depth of 50 feet (Stack-unit map). The soil association map and database were used in an interpretive mapping model that generated maps of nitrate and pesticide leaching classes by examining factors that relate to water movement characteristics of the soil. The pesticide contamination sensitivity data set was created by combining the nitrate map interpretations with information on the distribution of organic matter. (Pesticides are organic compounds that tend to adsorb to soil organic matter, and so have their movement in soil water retarded.) One of the results is six nitrate and six pesticide leaching classes that group soil associations based on the relative probability of nitrate and pesticide movement through the associated soil profiles. The ranking is qualitative, and is based on the median leaching value of the soil map units that comprise each soil association. Leaching classes include: Excessive, High, Moderate, Somewhat Limited, Limited, and Very Limited. See ISGS EG 148 for the derivation of these classes. To provide a measure of leaching class variability within each association, leaching class range values were calculated. Four trimmed range values were determined for the leaching classes in each soil association to give an indication of the variability within a specific leaching class. This data set is necessary because each soil association could have only a single leaching class value assigned to it. This item was calculated by sorting the component soil series in order of their leaching characteristic within the association. The trimmed range is the domain of leaching characteristic values between the 90th and 10th quantiles in the sorted list.To reduce the impact of extreme leaching class values on this estimate, the the range values were trimmed so that the upper and lower 10% of values were not included in the calculation. These trimmed range values were used as an overprint on the published map of leaching classes (see cross reference entries). For example, a particular soil association may have pesticide leaching values that range from "Excessive" to "Somewhat Limited", with a median value of "Moderate". This soil association is assigned an overall leaching value of "Moderate", with a range of 4 (being the values Excessive, High, Moderate, and Somewhat Limited). The ISGS statewide Stack-Unit map was used to create a map of depth to the uppermost aquifer, which was then combined with the maps of nitrate and pesticide leaching classes to ultimately derive aquifer sensitivity to contamination by nitrate and pesticide leaching. Six aquifer sensitivity classes are indicated: Excessive, High, Moderate, Somewhat limited, Limited, and Very limited. Disturbed land and surface water areas are also shown. These data are to be used in conjunction with ISGS Environmental Geology report 148. This data set was designed for statewide evaluation of agrichemical leaching characteristics and associated aquifer sensitivity to contamination. It was created to classify soils and aquifer settings according to predictions of leaching potential. The classifications have not been validated by the results of water quality sampling. Accordingly, the reliability of these aquifer sensitivity ratings as predictors of water quality has not been evaluated. 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. The feature classes includes county lines. These lines are not directly relevant to the data, but were originally necessary for technical reasons. Without the additional county lines, some of the polygons exceeded the maximum allowable vertex limit in ARCPLOT (ArcInfo Workstation 7.0.4). This problem was solved by the additional county lines, which serve to divide polygons with too many vertices into smaller units. Accordingly, to remove the county lines from maps created with ARCPLOT, the DROPLINE command must be used on conjunction with the COUNTY_NAME polygon item. In April 2004 the source coverages were transitioned to storage in an Oracle RDBMS using the ArcSDE geodatabase model. The result (this version) is designated edition 20040413. Prior to this time the feature classes were stored as six separate coverages in the ISGS GISDB archive. The coverage referred to in this documentation as STACK-ST was subsequently imported to the ISGS enterprise (SDE) database and is now known as GISDB_QTGEO.IL_Stack_Units_Py. 1995 publication date Complete None planned -91.4244 -87.3840 42.4951 36.9540 none aquifer groundwater water hydrology hydrogeology geology soil nitrate pesticide leaching agriculture contamination leachate none Illinois 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. 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. Please refer to the Distribution Information section. ArcSDE 9.1 on Oracle 10g Dennis P. McKenna and Donald A. Keefer 1991 report ISGS Open File Series (OFS) 1991-7R Champaign, Illinois Illinois State Geological Survey 18p Dennis P. McKenna and Donald A. Keefer 1991 map ISGS Open File Series (OFS) 1991-7S Champaign, Illinois Illinois State Geological Survey Statewide map. Color. Scale, 1:500,000. (computer-generated map) Dennis P. McKenna and Donald A. Keefer 1991 map ISGS Open File Series (OFS) 1991-7C Champaign, Illinois Illinois State Geological Survey Individual county maps. Black and white. Scale, 1:250,000. (computer-generated maps) Donald A. Keefer 1995 map ISGS Open File Series (OFS) 1995-2 Champaign, Illinois Illinois State Geological Survey statewide map, scale 1:500,000 Donald A. Keefer 1995 map ISGS Open File Series (OFS) 1995-3S Champaign, Illinois Illinois State Geological Survey statewide map, scale 1:500,000 Donald A. Keefer 1995 map ISGS Open File Series (OFS) 1995-4 Champaign, Illinois Illinois State Geological Survey statewide map, scale 1:500,000 Donald A. Keefer 1995 map ISGS Open File Series (OFS) 1995-5S Champaign, Illinois Illinois State Geological Survey statewide map, scale 1:500,000 Donald A. Keefer 1995 map ISGS Open File Series (OFS) 1995-5C Champaign, Illinois Illinois State Geological Survey county by county maps, scale 1:250,000 http://www.isgs.illinois.edu http://www.vpaa.uillinois.edu/policies/web_privacy.cfm http://www.uillinois.edu/trustees/rules.cfm#sec34 http://www.fs.uiuc.edu/cam/CAM/viii/viii-1.1.html This data set was created to classify soils and aquifer settings according to predictions of leaching potential. The classifications have not been validated by the results of water quality sampling. In addition, the use of these aquifer sensitivity ratings as predictors of water quality has not been evaluated. Nonuniform use of fertilizers might reduce the reliability of water quality predictions, which can only be validated by careful comparison with water quality data. Attributes assumed to be as accurate as the sources. The information produced from this data set passed the typical ISGS Peer Review associated with the publication of the ISGS EG 148. When in coverage form, polygon topology was present. Results of RESELECT logic were crossed checked in INFO using the FREQUENCY command and compared with source data to verify logical consistency of attribute values. All areas in Illinois are represented fully in regards to the scope of the modeling as described in ISGS EG 148. Both the soil association map and the stack-unit map describe materials that are often highly variable over short distances (e. g., within 1 mile). Accordingly, the data set has been generalized to provide the most information possible without including too much detail for efficient use. For this data set, evaluations of areas smaller than a township (approximately 36 square miles) are not recommended in order to maintain a confidence level consistent with the published source maps. The accuracy of this map is insufficient for evaluating the probability of nitrate leaching at specific points. It is the responsibility of the user to determine the appropriateness of this map for specific applications. U.S. Department of Agriculture 1991 map UU.S. Department of Agriculture Natural Resources Conservation Service (formerly the Soil Conservation Service) Miscellaneous Publication No. 1492 15000 digital 1991 publication date none Detailed information describing many characteristics for each soil association and soil phase, and information on the extent of each soil phase within each soil association. Berg, R.C., and J.P. Kempton 1988 report with map plates ISGS Circular 542 Champaign, Illinois Illinois State Geological Survey 250000 paper 1988 publication date none Detailed information describing many characteristics of geologic units using a recognized classification system partly based on interpretations of the average texture of each nonlithified (nonbedrock) unit and the average degree of cementation and fracturing of each bedrock unit. Illinois State Geological Survey 1995 map ISGS GIS Database stack-st Champaign, Illinois Illinois State Geological Survey 250000 digital tape media 1995 publication date none Lines, polygons and stack-unit designations. see Abstract and Purpose entries, and ISGS EG 184. 1995 The source coverages (no3aqsens, no3leach, no3lrange, pestaqsens, pestleach, pestlrange, all from workspace ../hydro) were imported into an ArcSDE enterprise geodatabase feature dataset for storage. Previously they were stored as individual coverages. The data were reprojected from the customary ISGS Lambert Conformal Conic projection (NAD27) to a geographic coordinate system (longitude, latitude) in decimal degrees (NAD83). The various coverage feature classes were imported using ArcCatalog 8.3. Some unnecessary data fields identifying county FIPS values were dropped. Prior to import, the spatial reference of the data set was changed to Geographic, decimal degrees, NAD83 in double precision. Also at this time, this metadata file was created. It is an amalgamation of the metadata files for the six source coverages. 20040413 Vector G-polygon 9724 G-polygon 3663 G-polygon 1452 G-polygon 10213 G-polygon 3897 G-polygon 1209 0.000001 0.000001 Decimal degrees North American Datum of 1983 Geodetic Reference System 80 6378137.000000 298.257222 GISDB_HYDRO.IL_Aquifer_NO3_Leach_Sens_Py GISDB_HYDRO.IL_NO3_Leach_Class_Py GISDB_HYDRO.IL_NO3_Leach_Class_Range_Py GISDB_HYDRO.IL_Aquifer_Pest_Leach_Sens_Py GISDB_HYDRO.IL_Pest_Leach_Class_Py GISDB_HYDRO.IL_Pest_Leach_Class_Range_Py Please refer to the metadata of the respective feature classes for specifics on attributes and their values. none Information Office, Illinois State Geological Survey (ISGS), a division of the Institute of Natural Resource Sustainability (INRS) of the University of Illinois mailing and physical address

615 East Peabody Drive

Champaign Illinois 61820 USA 217-333-4747 217-785-0211 isgs@isgs.illinois.edu 8:00 a.m. - 4:30 p.m., Monday-Friday, U.S. Central Time 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. 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. 20090224 Please refer to the Distribution Information section. FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 local time The access constraints as stated for the data apply also to the metadata. Refer to the Access Constraints section of the Identification Information section. The use constraints as stated for the data apply also to the metadata. Refer to the Use Constraints section of the Identification Information section. http://www.esri.com/metadata/esriprof80.html ESRI Metadata Profile