#  Begin METADATA documentation
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#  DATASET_NAME: hydrochem.archival_file_summary.txt	
#  DATASET_DESCRIPTION:	This file lists the data that were archived for USGS SIR 2008-5015, 
#      Hydrochemical regions of the glacial aquifer system and their environmental and 
#      water-quality characteristics by Arnold and others (2008).
#			
#  DATA_SET FORMAT: ascii-text	
#  DATA_SET URL: http://water.usgs.gov/nawqa-only/aq/data_archive/SIR2008_5015_DataArchive.zip
#
#-------------------------------------------------------------------------------------------------------- 
#  REPORT TITLE: Hydrochemical Regions of the Glacial Aquifer System, Northern
#                United States, and Their Environmental and Water-Quality 
#                Characteristics	
# 
#  REPORT SERIES/NUMBER: USGS Scientific Investigations Report 2008-5015     
#  REPORT URL: http://pubs.usgs.gov/sir/2008/5015/
#
#-------------------------------------------------------------------------------------------------------
#  NAWQA STUDY:	Principal Aquifer: Glacial aquifer system	
#
#-------------------------------------------------------------------------------------------------------
#
#  METADATA DATE:    August 21, 2008	
#  METADATA CONTACT: Terri Arnold	
#                    U.S. Geological Survey
#                    Illinois Water Science Center	
#                    1201 W University Ave, Suite 100	
#	 	     Urbana, IL 61801
#	
#                    	voice: (217)328-9702
#                    	fax:   (217)344-0082
#                    	email:  tlarnold@usgs.gov
#
#  SECONDARY CONTACT:  Kelly Warner
#                      Same address as above
#                    	
#                    	voice: (217)328-9739
#                    	fax:   (217)344-0082
#                    	email: klwarner@usgs.gov  
#
# ------------------------------------------------------------------------------------------------------
#  DATA_SET_NAMES:
#
#  The following files document and archive the data sets used for 
#  producing the subject report. Brief descriptions of each of these report 
#  archival files follow.
#
#  SUMMARY OF ARCHIVE:
#  hydrochem.archival_file_summary.txt (this file)
#
#  TABULAR_DATA:
#  hydrochem.maindata.txt
#  hydrochem.watertype.txt
#
#  SPATIAL_DATA:
#  hydrochem.mlcalt30sig.gsg.txt
#  hydrochem.gdb
#  hydrochem.gdb_metadata.txt
#  clay_metadata.txt
#  clusters_metadata.txt
#  glacbnd_metadata.txt
#  glacbuf_metadata.txt
#  MLClassos0208_metadata.txt
#  MLConf0208_metadata.txt
#  nlcde_metadata.txt
#  perg_metadata.txt
#  precip_metadata.txt
#  recharge_metadata.txt
#  slope_metadata.txt
#  surfdep_metadata.txt
#  surftxt_metadata.txt
#  temperature_metadata.txt
#
#---------------------------------------------------------------------------
#  REPORT_ARCHIVAL_DATA_SET: hydrochem.archival_file_summary.txt (this file)
# 
#    Ascii file listing the data that were archived for USGS SIR 2008-5015,
#
#---------------------------------------------------------------------------
#  REPORT_ARCHIVAL_DATA_SET: hydrochem.maindata.txt
#
#   This data set contains ground-water field parameter, 
#   major ion, trace element, and nutrient data retrieved 
#   from the NAWQA Internal Data Warehouse
#   (http://infotrek.er.usgs.gov/pls/nawqa_www) on Sept. 16, 2005.
#   It also contains data from ancillary environmental variables
#   that characterize the area within 500-meters around a well.
#   The data will is used in SIR2008-5015 to characterize 
#   Hydrochemical regions of the Glacial Principal Aquifer 
#   as part of the U.S. Geological Survey, National 
#   Water-Quality Assessment Program.	
#
#---------------------------------------------------------------------------
#  REPORT_ARCHIVAL_DATA_SET: hydrochem.watertype.txt
#
#   This data set contains water types of the glacial aquifer 
#   system.  The water types were calculated by aquachem using major and 
#   minor ion concentrations. Water types were then summarized manually 
#   to classify the water types into fewer categories.
#
#---------------------------------------------------------------------------
#  REPORT_ARCHIVAL_DATA_SET: hydrochem.mlcalt30sig.gsg.txt
#
#    The information contained in this file is the signature or 
#    index file used in maximum likelihoon (supervised) classification (MLC)
#    to map hydrochemical regions of the glacial aquifer system based 
#    on clustered wells with similar water quality conditions and 
#    select environmental ancillary variables (listed in header of 
#    signature file). Environmental characteristics of each cluster 
#    were identified when the wells were spatially overlaid with the 
#    combined layers of environmental characteristics, creating the 
#    training sample. Multivariate statistics describing environmental 
#    characteristics for the training sample were stored in a text file 
#    called a signature or index file that the MLC then used to classify 
#    the glacial aquifer system into hydrochemical regions. The 
#    hydrochemical regions have the highest probability of matching 
#    the environmental characteristics of the corresponding cluster 
#    groups (the training sample).  See methods section in the published 
#    report SIR2008-5015 for details.
#    The data is used in SIR2008-5015 to characterize 
#    Hydrochemical regions of the Glacial Principal Aquifer 
#    as part of the U.S. Geological Survey, National Water-Quality 
#    Assessment Program.	
#
#---------------------------------------------------------------------------
#  REPORT_ARCHIVAL_DATA_SET: hydrochem.gdb
#
#    File Geodatabase of spatial data (ArcMap 9.2) used to create the map 
#    of hydrochemical regions.
#
#---------------------------------------------------------------------------
#  REPORT_ARCHIVAL_DATA_SET: hydrochem.gdb_metadata.txt
#
#    Metadata for hydrochem.gdb
#
#---------------------------------------------------------------------------
#  REPORT_ARCHIVAL_DATA_SET: clay_metadata.txt
#
#    Metadata for the clay layer of hydrochem.gdb. 
#
#---------------------------------------------------------------------------
#  REPORT_ARCHIVAL_DATA_SET: clusters_metadata.txt
#
#    Metadata for the clusters layer of hydrochem.gdb
#
#---------------------------------------------------------------------------
#  REPORT_ARCHIVAL_DATA_SET: glacbnd_metadata.txt
#
#    Metadata for the glacbnd layer of hydrochem.gdb
#
#---------------------------------------------------------------------------
#  REPORT_ARCHIVAL_DATA_SET: glacbuf_metadata.txt
#
#    Metadata for the glacbuf layer of hydrochem.gdb
#
#---------------------------------------------------------------------------
#  REPORT_ARCHIVAL_DATA_SET: MLClassos0208_metadata.txt
#
#    Metadata for the MLCLassos0208 layer of hydrochem.gdb
#
#---------------------------------------------------------------------------
#  REPORT_ARCHIVAL_DATA_SET: MLConf0208_metadata.txt
#
#    Metadata for the MLConf0208 layer of hydrochem.gdb
#
#---------------------------------------------------------------------------
#  REPORT_ARCHIVAL_DATA_SET: nlcde_metadata.txt
#
#    Metadata for the nlcde layer of hydrochem.gdb
#
#---------------------------------------------------------------------------
#  REPORT_ARCHIVAL_DATA_SET: perg_metadata.txt
#
#    Metadata for the perg layer of hydrochem.gdb
#
#---------------------------------------------------------------------------
#  REPORT_ARCHIVAL_DATA_SET: precip_metadata.txt
#
#    Metadata for the precip layer of hydrochem.gdb
#
#---------------------------------------------------------------------------
#  REPORT_ARCHIVAL_DATA_SET: recharge_metadata.txt
#
#    Metadata for the recharge layer of hydrochem.gdb
#
#---------------------------------------------------------------------------
#  REPORT_ARCHIVAL_DATA_SET: slope_metadata.txt
#
#    Metadata for the slope layer of hydrochem.gdb
#
#---------------------------------------------------------------------------
#  REPORT_ARCHIVAL_DATA_SET: surfdep_metadata.txt
#
#    Metadata for the surfdep layer of hydrochem.gdb
#
#---------------------------------------------------------------------------
#  REPORT_ARCHIVAL_DATA_SET: surftxt_metadata.txt
#
#    Metadata for the surftxt layer of hydrochem.gdb
#
#---------------------------------------------------------------------------
#  REPORT_ARCHIVAL_DATA_SET: temperature_metadata.txt
#
#    Metadata for the temperature layer of hydrochem.gdb
#
#---------------------------------------------------------------------------
#  End METADATA documentation
# -------------------------------------------------------------------------