#
#
#  FILE_NAME: 		Cambrian_Ordovician_archival_file_summary
#  DATASET_DESCRIPTION:	This data set was used in a report to characterize the Cambrian-Ordovician Aquifer  
#			System as part of the US Geological Survey National Water Quality Assessment 
#			Program (NAWQA).
#  DATA_SET FORMAT:	Tab-delimited ascii file
#  DATA_SET URL:	http://water.usgs.gov/nawqa-only/aq/data_archive/SIR2011_5229_Data.zip
#
#-------------------------------------------------------------------------------------------------------- 
#  REPORT TITLE: 	Water-quality assessment of the Cambrian-Ordovician aquifer system in the northern
#			Midwest, United States
#  REPORT SERIES/NUMBER USGS Scientific Investigation Report (SIR 2011-5229)     
#  REPORT URL:          http://pubs.usgs.gov/sir/2011/5229/
#
#-------------------------------------------------------------------------------------------------------
#  NAWQA STUDY:		Principal Aquifer: Cambrian-Ordovician
#
#-------------------------------------------------------------------------------------------------------
#
#  METADATA DATE:    	August 02, 2011
#  METADATA CONTACT: 	John Wilson
#                    	USGS-WRD, Indiana Water Science Center 
#                    	5957 Lakeside Boulevard
#	 	     	Indianapolis, IN 46278	
#                    	voice: (317) 600-2752
#                    	fax:   (317) 290-3313
#                    	email:  jtwilson@usgs.gov
#
#  SECONDARY CONTACT:   Kelly Warner (PA Lead Scientist)
#                    	USGS-WRD, Illinois Water Science Center 
#                       1201 West University Avenue, Suite 100       
#                       Urbana, IL 61801	
#                    	voice: (217) 328-9727
#                    	fax:   (217) 344-0082
#                    	email:  klwarner@usgs.gov
#  
# ------------------------------------------------------------------------------------------------------
#  DATA_SET NAMES:
#
#  The following files document and archive the data sets used for producing this report. Brief descriptions of 
#  each of these report archival files follow. The archival files are sorted by major topic in directories/folders.
#  In general, a filename that includes '_nawqa_rasa' is for a data set that contains sample results from the NAWQA
#  and RASA Programs. A filename that includes '_nawqa' is for a data set that only contains sample results 
#  from the NAWQA Program. A filename that includes '_all" is for a data set that contains sample results from
#  multiple sources (like NWIS and state agencies). 
#
#
#  Directory covers:
# 	camord.shp
#	regions.shp
#
#
#  Directory geochem:
#	camord_hydrochemical_facies.txt
#	camord_nawqa_redox.txt
#	camord_PHREEQC_input.txt
#	camord_PHREEQC_output.txt
#
#
#  Directory majors_nutrients:
#	camord_majors_nawqa_mdl.txt
#	camord_majors_nutrients_all.txt
#	camord_nawqa_rasa_majors.txt
#	camord_nutrients_nawqa_mdl.txt
#	camord_umis_nitrate_nawqa_resample.txt
#	camord_wmic_nitrate_nawqa_resample.txt
#	majors.code2.txt
#
#
#  Directory pesticides_vocs_mixtures:
#	camord_cycleII_mixtures.txt
#	camord_cycleII_mixtures_data.txt
#	camord_cycleII_pesticides.txt
#	camord_cycleII_vocs.txt
#	camord_pesticides_resample.txt
#	camord_umis_pesticides_resample.txt
#	camord_wmic_pesticides_resample.txt
#
#
#  Directory QC_NAWQA:
#	camord_majors_nutrients_nawqa_blanks.txt
#	camord_majors_nutrients_nawqa_replicates.txt
#	camord_pesticides_nawqa_blanks.txt
#	camord_pesticides_nawqa_replicates.txt
#	camord_radium_nawqa_blanks.txt
#	camord_radium_nawqa_replicates.txt
#	camord_radon_nawqa_replicates.txt
#	camord_trace_nawqa_blanks.txt
#	camord_trace_nawqa_replicates.txt
#	camord_vocs_nawqa_blanks.txt
#	camord_vocs_nawqa_replicates.txt
#
#
#  Directory spearman_rank_corr:
#	camord_nawqa_spearman.txt
#	cor.all.code.txt
#
#
#  Directory trace_elements_radchem:
#	camord_hydrochemical_facies.txt
#	camord_nawqa_rasa_rad226.txt
#	camord_radium_minn_all.txt
#	camord_radium_nawqa.txt
#	camord_radon_nawqa.txt
#	camord_radon_nawqa_lithology.txt
#	camord_radon_nawqa_resample.txt
#	camord_trace_nawqa_mdl.txt
#	camord_trace_rad_all.txt
#	trace.summary.code.txt
#	
#
#  Directory water_use:
#	camord_water_use_data.txt	
#	
#
#
#
#--------------------------------------------------------------------------------------------------------
#  REPORT ARCHIVAL DATA SET: camord.shp
#
#	This geospatial data layer is a shape file (polygon) that represents the extent of the Cambrian-
#	Ordovician aquifer system in the states of Wisconsin, Michigan, Minnesota, Iowa, Illinois, Indiana, 
#	and Missouri. It does not include Precambrian Sandstones (Hinckley or Jacobsville Sandstones). 
#	There are several areas of Precambrian Crystalline rocks within the boundary of the aquifer system.
# 
#	Purpose: These data delineate the areal extent of the Cambrian-Ordovician aquifer system as defined 
#	in the 'groundwater Atlas of the United States' (U.S. Geological Survey HA 730). The boundary of the 
#	aquifer extent was refined using more detailed State bedrock geology maps (digital versions). 
#	The refinement consisted of providing more detailed line work along the northern boundary between 
#	Cambrian and Precambrian rocks, and moving the southern boundary to coincide with the Missouri River.
#
#
#--------------------------------------------------------------------------------------------------------
#  REPORT ARCHIVAL DATA SET: regions.shp
#
#	This geospatial data layer is a shape file (polygon) that represents the extent of the Cambrian-
#	Ordovician aquifer system in the states of Wisconsin, Michigan, Minnesota, Iowa, Illinois, Indiana, 
#	and Missouri. This data set also represents the different areas of regional confinement--confined 
#	(aquifer system is buried by Maquoketa Shale and younger bedrock) and unconfined (aquifer system 
#	is exposed at the bedrock surface). This data set also represents areas of Precambrian Sandstones
#	and Precambrian Crystalline rocks. Precambrian Sandstones (Jacobsville Ss, Hinckley Ss) are 
#	hydraulically connected to and often indistinguishable from Cambrian Sandstones in Michigan and Minnesota. 
#
#	Purpose: These data delineate the areal extent of the Cambrian-Ordovician aquifer system as defined 
#	in the 'groundwater Atlas of the United States' (U.S. Geological Survey HA 730). The boundary of the 
#	aquifer extent was refined using more detailed State bedrock geology maps (digital versions). 
#	The refinement consisted of providing more detailed linework along the northern boundary between Cambrian 
#	and Precambrian rocks, and moving the southern boundary to coincide with the Missouri River. The boundary 
#	where the aquifer system is exposed at the bedrock surface or buried by the Upper Ordovician Maquoketa Shale  
#	or younger bedrock was refined by editing line work along the boundary of the Maquoketa Shale to more closely 
#	match what is on the State geologic maps. In Minnesota, the detail for this boundary was obtained from 
#	a digital version of the 1974 King and Beikman map (Scruben and others, 1997).
#
#
#--------------------------------------------------------------------------------------------------------
#  REPORT ARCHIVAL DATA SET: camord_hydrochemical_facies.txt
#
#	This data set contains groundwater data from multiple sources (not just NAWQA) for major 
#	ions, radionuclides, some physical properties, TDS, and hardness for wells completed in the 
#	Cambrian-Ordovician Aquifer System. 
#	The major-ion data were converted to milliequivalents per liter (meq/L) in order to determine
#	hydrochemical facies for cations and anions using the methods of or similar to Back (1966).
#
#	Meq/L were calculated using the conversion factors of Hem (1989, table 9).
#
#	Cation facies and anion facies were mapped in the subject report.
#	Cation facies were also used as a grouping variable for determining statistically significant
#	differences in radium-226, radium-228, and radon-222, using those wells that included a 
#	value for radium and/or radon-222.
#
#	Samples needed to have a value for alkalinity (or bicarbonate) in order to be used for 
#	determining the sum of anions.
#
#
#--------------------------------------------------------------------------------------------------------
#  REPORT ARCHIVAL DATA SET: camord_nawqa_redox.txt
#
#	This data set contains input data and results for determining redox category for NAWQA samples 
#	with the Excel spreadsheet of Jurgens and others (2009)
#	Jurgens, B.C., McMahon, P.B., Chapelle, F.H., and Eberts, S.M., 2009, An Excel workbook for 
#	identifying redox processes in groundwater: U.S. Geological Survey Open-File Report 2009-1009, 8 p.
#
#	Source of Redox Categories & Process:
#	McMahon, P.B., and Chapelle, F.H., 2008, Redox processes and water quality of selected principal 
#	aquifer systems: groundwater, v. 46, p. 259–271.
#		
#	Data were retrieved from the NAWQA Internal Data Warehouse on or about February 19, 2008.
#	The data will be used in a report to characterize the Cambrian-Ordovician Aquifer System 
#	as part of the U.S. Geological Survey, National Water-Quality Assessment Program.
#
#
#--------------------------------------------------------------------------------------------------------
#  REPORT ARCHIVAL DATA SET: camord_PHREEQC_input.txt
#
#	This data set contains NAWQA groundwater data that make up the input file for the geochemical model
#	PHREEQCI (pH Redox Equilibrium Calculations in C)--C refers to the programming language,
#	"I" refers to the graphical user interface version.
#	Data were retrieved from the NAWQA Internal Data Warehouse on or about February 19, 2008.
#	The data will be used in a report to characterize the Cambrian-Ordovician Aquifer System 
#	as part of the U.S. Geological Survey, National Water-Quality Assessment Program.
#
#
#--------------------------------------------------------------------------------------------------------
#  REPORT ARCHIVAL DATA SET: camord_PHREEQC_output.txt
#
#	This data set contains output from the geochemical model PHREEQCI that included aqueous
#	speciation and saturation indices for minerals.
#	PHREEQCI stands for (pH Redox Equilibrium Calculations in C)--C refers to the programming language,
#	"I" refers to the graphical user interface version.
#
#	Input data are listed at the beginning of the output file, and were retrieved from the 
#	NAWQA Internal Data Warehouse on or about February 19, 2008.
#	Refer to camord_PHREEQCI_input.txt for more explanation of input data.
#
#
#--------------------------------------------------------------------------------------------------------
#  REPORT ARCHIVAL DATA SET: camord_majors_nawqa_mdl.txt
#
#	This data set contains NAWQA groundwater data for major ions and physical properties 
#	that were used to compute summary statistics for the subject report. These data
#	were also used to test for statistically significant differences between regional confinement
#	and tritium-based age, and for plotting as boxplots and a trilinear (piper) diagram. 
#
#	Non-detections were recensored from Laboratory Reporting Levels to Long-Term Method Detection
#	Levels that applied to the sample date.
#
#
#--------------------------------------------------------------------------------------------------------
#  REPORT ARCHIVAL DATA SET: camord_majors_nutrients_all.txt
#
#	This data set contains groundwater data from multiple sources (not just NAWQA) for major 
#	ions, nutrients, and physical properties for wells completed in the Cambrian-Ordovician 
#	Aquifer System. These data were used to map selected water-quality constituents throughout 
#	the aquifer system. These data were also used to test for statistically significant 
#	differences in concentrations of selected constituents between regionally confined wells 
#	and regionally unconfined wells. Regionally confined areas are defined in this report as 
#	being covered by the Upper Ordovician Maquoketa Shale or younger bedrock.    
#
#	Sample dates range as far back as 1960 to as recent as 2008.
#
#
#--------------------------------------------------------------------------------------------------------
#  REPORT ARCHIVAL DATA SET: camord_nawqa_rasa_majors.txt
#
#	This data set contains groundwater data for major ions and TDS at six wells in Iowa.  
#	The wells were sampled by the Regional Aquifer-System Analysis (RASA) Program
#	in 1980 or 1981. The wells were later sampled by the NAWQA Program in 2005 or 2007.
#	The data are used in an analysis of the temporal variability of major ions. 
#
#
#--------------------------------------------------------------------------------------------------------
#  REPORT ARCHIVAL DATA SET: camord_nutrients_nawqa_mdl.txt
#
#	This data set contains NAWQA groundwater data for nutrients and dissolved organic carbon that were 
#	used to compute summary statistics for the subject report. These data
#	were also used to test for statistically significant differences between regional confinement
#	and tritium-based age, and for plotting as boxplots. 
#
#	Non-detections were recensored from Laboratory Reporting Levels to Long-Term Method Detection
#	Levels that applied to the sample date.
#
#--------------------------------------------------------------------------------------------------------
#  REPORT ARCHIVAL DATA SET: camord_umis_nitrate_nawqa_resample.txt
#
#	This data set contains NAWQA groundwater data for nitrate (nitrate + nitrite) samples 
#	collected from 23 NAWQA wells from the UMIS sampling network in 1996 and again in 2007. These data 
#	were used as part of the analysis of near decadal-scale changes in nitrate concentrations.
#		
#	All nitrate non-detections are recensored to < 0.05 for purposes of comparison.
#		
#
#--------------------------------------------------------------------------------------------------------
#  REPORT ARCHIVAL DATA SET: camord_wmic_nitrate_nawqa_resample.txt
#
#	This data set contains NAWQA groundwater data for nitrate (nitrate + nitrite) samples 
#	collected from 26 NAWQA wells from the WMIC sampling network in 1995 and again in 2002. These data
#	were used as part of the analysis of near decadal-scale changes in nitrate concentrations.
#		
#	All nitrate non-detections are recensored to < 0.05 for purposes of comparison.
#		
#
#--------------------------------------------------------------------------------------------------------
#  REPORT ARCHIVAL DATA SET: majors.code2.txt
#
#	This S-PLUS script computes left-censored summary statistics for NAWQA Major Ion data
#	It also computes summary statistics and quantiles for Physical Properties and Major Ions
#	that do not have censored data
#
#
#--------------------------------------------------------------------------------------------------------
#  REPORT ARCHIVAL DATA SET: camord_cycleII_mixtures.txt
#
#	This data set contains the list of unique mixtures of nitrate (> 1 mg/L),
#	pesticides, and VOCs detected in NAWQA samples (anthropogenic contaminants). The unique mixtures
#	were tabulated by Jon Scott (Oklahoma WSC) on 01/08/2010. 
#	The data will be used in a report to characterize 
#	the Cambrian-Ordovician Aquifer System as part of the 
#	U.S. Geological Survey, National Water-Quality Assessment Program.
#
#
#--------------------------------------------------------------------------------------------------------
#
#  REPORT ARCHIVAL DATA SET: camord_cycleII_mixtures_data.txt
#	This data set contains groundwater data for tabulating unique mixtures of nitrate (> 1 mg/L),
#	pesticides, and VOCs detected in NAWQA samples (anthropogenic contaminants). Data were retrieved 
#	from the NAWQA Internal Data Warehouse on or about February 19, 2008.
#	The data will be used in a report to characterize the Cambrian-Ordovician Aquifer System as part of the 
#	U.S. Geological Survey, National Water-Quality Assessment Program.
#
#
#--------------------------------------------------------------------------------------------------------
#  REPORT ARCHIVAL DATA SET: camord_cycleII_pesticides.txt
#
#	This data set contains NAWQA groundwater pesticides data for wells completed in the Cambrian-
#	Ordovician Aquifer System. These data were used to determine detection frequencies of selected
#	pesticides in samples collected during the second decade (Cycle II) of NAWQA. Concentrations of
#	pesticides were also compared to human-health benchmarks. Sample dates range from 2002 to 2007.
#
#	Pesticides analyzed in Cycle II samples are from USGS Lab Schedule 2033, which includes 83 pesticides 
#	and degradates. A subset of 35 pesticides were also analyzed in Cycle I samples, and were included 
#	in USGS Circular 1291 (Gilliom and others, 2006). 
#
#
#--------------------------------------------------------------------------------------------------------
#  REPORT ARCHIVAL DATA SET: camord_cycleII_vocs.txt
#
#	This data set contains NAWQA groundwater VOCs data for wells completed in the Cambrian-Ordovician
#	Aquifer System. These data were used to determine detection frequencies of selected
#	VOCs in samples collected during the second decade (Cycle II) of NAWQA. Concentrations of
#	VOCs are also compared to human-health benchmarks. Sample dates range from 2002 to 2007.
#
#
#--------------------------------------------------------------------------------------------------------
#  REPORT ARCHIVAL DATA SET: camord_pesticides_resample.txt
#
#	This data set contains groundwater pesticide data retrieved from the NAWQA Internal Data Warehouse on or 
#	about March 05, 2008.
#
#	These data are used for the analysis of near decadal-scale changes in pesticides by looking at changes
#	in the number of pesticides detected and the total concentration of pesticides detected in two samples
#	collected at each well of two networks. One network of wells is located in the Minneapolis-St. Paul
#	(Twin Cities) Metropolitan Area of Minnesota and western Wisconsin in the Upper Mississippi River Basin
#	(UMIS) NAWQA study unit. One network of wells is located in eastern Wisconsin and the Upper Peninsula of 
#	Michigan in the Western Lake Michigan Drainages (WMIC) NAWQA study unit.
#
#
#--------------------------------------------------------------------------------------------------------
#  REPORT ARCHIVAL DATA SET: camord_umis_pesticides_resample.txt
#
#	This data set contains NAWQA groundwater data on the number of pesticides detected and the total 
#	concentration of detected pesticides for two samples collected at each of 23 wells in a well
#	network (UMIS) in the Minneapolis-St. Paul Metropolitan Area. This information is based on pesticides 
#	data retrieved from the NAWQA Internal Data Warehouse on or about March 05, 2008.
#
#	These data are used for the analysis of near decadal-scale changes in pesticides by looking at changes
#	in the number of pesticides detected and the total concentration of pesticides detected in two samples
#	collected at each well of two networks. One network of wells is located in the Minneapolis-St. Paul
#	(Twin Cities) Metropolitan Area of Minnesota and western Wisconsin in the Upper Mississippi River Basin
#	(UMIS) NAWQA study unit. One network of wells is located in eastern Wisconsin and the Upper Peninsula of 
#	Michigan in the Western Lake Michigan Drainages (WMIC) NAWQA study unit.
#
#
#--------------------------------------------------------------------------------------------------------
#  REPORT ARCHIVAL DATA SET: camord_wmic_pesticides_resample.txt
#
#	This data set contains NAWQA groundwater data on the number of pesticides detected and the total 
#	concentration of detected pesticides for two samples collected at each of 26 wells in a well
#	network (WMIC) in eastern Wisconsin and the Michigan Upper Peninsula. This information is 
#	based on pesticides data retrieved from the NAWQA Internal Data Warehouse on or about 
#	March 05, 2008.
#
#	These data are used for the analysis of near decadal-scale changes in pesticides by looking at changes
#	in the number of pesticides detected and the total concentration of pesticides detected in two samples
#	collected at each well of two networks. One network of wells is located in the Minneapolis-St. Paul
#	(Twin Cities) Metropolitan Area of Minnesota and western Wisconsin in the Upper Mississippi River Basin
#	(UMIS) NAWQA study unit. One network of wells is located in eastern Wisconsin and the Upper Peninsula of 
#	Michigan in the Western Lake Michigan Drainages (WMIC) NAWQA study unit.
#
#
#--------------------------------------------------------------------------------------------------------
#  REPORT ARCHIVAL DATA SET: camord_majors_nutrients_nawqa_blanks.txt
#
#	This data set contains NAWQA groundwater data for major ions, ammonia, nitrate, and dissolved
#	organic carbon that were used to evaluate detections in Field Blanks. 
#
#
#--------------------------------------------------------------------------------------------------------
#  REPORT ARCHIVAL DATA SET: camord_majors_nutrients_nawqa_replicates.txt
#
#	This data set contains NAWQA groundwater data for major ions, ammonia, nitrate, and dissolved
#	organic carbon that were used to evaluate the variability of concentrations in replicate pairs. 
#
#	Replicate pairs are comprised of an environmental sample and a replicate sample. A replicate
#	pair was included in the analysis if both the environmental sample and the replicate sample
#	had a quantifiable detection (non-detections were not used).
#
#
#--------------------------------------------------------------------------------------------------------
#  REPORT ARCHIVAL DATA SET: camord_pesticides_nawqa_blanks.txt
#
#	This data set contains NAWQA groundwater data for pesticides that were used to evaluate 
#	detections of pesticides in Field Blanks.
#             
#	Data were retrieved from the NAWQA Internal Data Warehouse on or about April 14, 2010.
#	Blank data for the WMIC study unit were not in Data Warehouse and were provided by 
#	the Wisconsin Water Science Center.
#
#
#--------------------------------------------------------------------------------------------------------
#  REPORT ARCHIVAL DATA SET: camord_pesticides_nawqa_replicates.txt
#
#	This data set contains NAWQA groundwater data for pesticides that were used to evaluate the 
#	variability of concentrations in replicate pairs.
#             
#	Replicate pairs are comprised of an environmental sample and a replicate sample. A replicate
#	pair was included in the analysis if both the environmental sample and the replicate sample
#	had a quantifiable detection (non-detections were not used).
#
#
#--------------------------------------------------------------------------------------------------------
#  REPORT ARCHIVAL DATA SET: camord_radium_nawqa_blanks.txt
#
#	This data set contains NAWQA groundwater data for radium-226 and radium-228 that were 
#	used to evaluate Field Blanks.
#
#
#--------------------------------------------------------------------------------------------------------
#  REPORT ARCHIVAL DATA SET: camord_radium_nawqa_replicates.txt
#
#	This data set contains NAWQA groundwater data for radium-226 and radium-228 that were 
#	used to evaluate the variability of concentrations in replicate pairs.
#
#	Replicate pairs are comprised of an environmental sample and a replicate sample. A replicate
#	pair was included in the analysis if both the environmental sample and the replicate sample
#	had a quantifiable detection (non-detections were not used).
#
#
#--------------------------------------------------------------------------------------------------------
#  REPORT ARCHIVAL DATA SET: camord_radon_nawqa_replicates.txt
#
#	This data set contains NAWQA groundwater data for radon-222 that were used to evaluate 
#	the variability of concentrations in replicate pairs.
#
#	Replicate pairs are comprised of an environmental sample and a replicate sample. A replicate
#	pair was included in the analysis if both the environmental sample and the replicate sample
#	had a quantifiable detection (non-detections were not used).
#
#
#--------------------------------------------------------------------------------------------------------
#  REPORT ARCHIVAL DATA SET: camord_trace_nawqa_blanks.txt
#
#	This data set contains NAWQA groundwater data for trace elements that were used to evaluate 
#	detections of trace elements in Field Blanks. 
#
#	Data were retrieved from the NAWQA Internal Data Warehouse on or about April 14, 2010.
#	Blank data for the WMIC study unit were not in Data Warehouse and were provided by 
#	the Wisconsin Water Science Center.
#
#
#
#--------------------------------------------------------------------------------------------------------
#  REPORT ARCHIVAL DATA SET: camord_trace_nawqa_replicates.txt
#
#	This data set contains NAWQA groundwater data for trace elements that were used to evaluate 
#	the variability of concentrations in replicate pairs. 
#
#	Replicate pairs are comprised of an environmental sample and a replicate sample. A replicate
#	pair was included in the analysis if both the environmental sample and the replicate sample
#	had a quantifiable detection (non-detections were not used).
#
#
#--------------------------------------------------------------------------------------------------------
#  REPORT ARCHIVAL DATA SET: camord_vocs_nawqa_blanks.txt
#
#	This data set contains NAWQA groundwater data for VOCs that were used to evaluate 
#	detections of VOCs in Field Blanks.
#             
#	Data were retrieved from the NAWQA Internal Data Warehouse on or about March 13, 2008.
#	Blank data for the WMIC study unit were not in Data Warehouse and were provided by 
#	the Wisconsin Water Science Center.
#
#
#--------------------------------------------------------------------------------------------------------
#  REPORT ARCHIVAL DATA SET: camord_vocs_nawqa_replicates.txt
#
#   Abstract:	This data set contains NAWQA groundwater data for VOCs that were used to evaluate the 
#		variability of concentrations in replicate pairs.
#             
#		Replicate pairs are comprised of an environmental sample and a replicate sample. A replicate
#		pair was included in the analysis if both the environmental sample and the replicate sample
#		had a quantifiable detection (non-detections were not used).
#
#
#--------------------------------------------------------------------------------------------------------
#  REPORT ARCHIVAL DATA SET: camord_nawqa_spearman.txt     
#
#	This data set contains NAWQA groundwater data for major ions, physical properties, trace elements, 
#	radionuclides, and well characteristics that were used to compute Spearman Rank Correlation 
#	Coefficients (rho) and p-values. The results are presented as a matrix table of correlation 
#	coefficients (rho) in the report.
#
#	Non-detections were recensored from Laboratory Reporting Levels to Long-Term Method Detection
#	Levels that applied to the sample date.
#
#	Low tritium values and non-detections were recensored to 0.3.
#	Low dissolved oxygen values and non-detections were recensored to 0.18.
#
#	Some non-detections for Mn, Ni, U, As, Pb, and Mo from 1995 and 1996 were removed because of the 
#	high detection level of 1 microgram per liter. The detection level of 1 ug/L is much higher 
#	than many detections from more recent samples. 
#
#--------------------------------------------------------------------------------------------------------
#  REPORT ARCHIVAL DATA SET: cor.all.code.txt 
#
#	This S-PLUS script computes correlations (Spearman's Rho) between analytes 
#
#	Major ion, nutrient, and trace data non-detections have been recensored from Reporting Levels 
#	to Detection Level. This way the samples are retained but are very small relative to the 
#	true detections.
#	Radchem non-detections are equal to the sample specific reporting level.
#
#
#--------------------------------------------------------------------------------------------------------
#  REPORT ARCHIVAL DATA SET: camord_nawqa_rasa_rad226.txt 
#
#	This data set contains groundwater data for radium-226 at six wells in Iowa.  
#	The wells were sampled by the Regional Aquifer-System Analysis (RASA) Program
#	in 1980 or 1981. The wells were later sampled by the NAWQA Program in 2005 or 2007.
#	The data are used in an analysis of the temporal variability of radium-226. 
#
#	Radium-226 results for the RASA samples are for pcode 09510--alpha emitting radium-226,
#	filtered water, planchett method.
#
#	Radium-226 results for the NAWQA samples are for pcode 09511--radium-226, filtered water,
#	radon method.
#
#
#--------------------------------------------------------------------------------------------------------
#  REPORT ARCHIVAL DATA SET: camord_radium_minn_all.txt 
#
#	This data set contains groundwater data from multiple sources (not just NAWQA) for 
#	radium-226, radium-228, and combined radium for wells completed in the Cambrian-Ordovician 
#	Aquifer System in Minnesota. 
#	These data were used to map radium concentrations in Minnesota. 
#	These data were also used to test for statistically significant differences in concentrations 
#	of radium-226, radium-228, and combined radium between samples from the Mount Simon Sandstone
#	and samples from aquifers above the Mount Simon Sandstone.  
#
#	NAWQA data were retrieved from the NAWQA Internal Data Warehouse on or about February 13, 2008.
#
#	RASA data were obtained from the data table in the RASA report: 
#	Siegel, D.I., 1989, Geochemistry of the Cambrian-Ordovician aquifer system in the Northern
#	Midwest, United States: U.S. Geological Survey Professional Paper 1405-D.
#
#	NWIS data were retrieved from the NWIS database on various dates during 2008 and 2009.
#	Data were obtained from the Minnesota Department of Health (MNDOH) during 2008.
#	USGS samples for radium are filtered, radium samples from the MNDOH are presumed to be unfiltered.
#
#	
#--------------------------------------------------------------------------------------------------------
#  REPORT ARCHIVAL DATA SET: camord_radium_nawqa.txt 
#
#	This data set contains NAWQA groundwater data for radium-226, radium-228, selected major ions and 
#	trace elements, and physical properties. Data were used to compute summary statistics for radium
#	in the subject report. These data were also used to test for statistically significant differences 
#	in radium concentrations between regional confinement and tritium-based age, 
#	and for plotting as boxplots. 
#
#	These data were used to show the geochemical relation of radium with selected constituents
#	such as sulfate, TDS, iron, sodium, fluoride, barium, and strontium. These data were also
#	used to show the geochemical relation of radium with the saturation index of selected minerals.
#
#	Radium-226 and radium-228 include left-censored data (non-detections). For these constituents,
#
#
#--------------------------------------------------------------------------------------------------------
#  REPORT ARCHIVAL DATA SET: camord_radon_nawqa.txt 
#
#	This data set contains NAWQA groundwater data for radon-222, physical properties, TDS, and hardness.
#	Data were used to compute summary statistics for radon-222 in the subject report. These data 
#	were also used to test for statistically significant differences in radon-222 concentrations 
#	between regional confinement and tritium-based age, and for plotting as boxplots. 
#
#	Radon-222 includes left-censored data (non-detections); therefore, parametric summary statistics
#	are based on ROS (Regression on Ordered Statistics).
#		
#	Non-detections of radon-222 were recensored to Laboratory Reporting Level, which is the sample-specific
#	minimum detectable concentration (SSMDC).
#
#--------------------------------------------------------------------------------------------------------
#  REPORT ARCHIVAL DATA SET: camord_radon_nawqa_lithology.txt 
#
#	This data set contains NAWQA groundwater data for radon-222 samples collected at 50 wells
#	in the Twin Cities area of Minnesota and western Wisconsin. Sample dates range from
#	1996 to 2007. These wells are located in the Upper Mississippi River Basin (UMIS)
#	NAWQA study unit.
#
#	This data set also contains data for radon-222 samples collected at 31 wells in 
#	eastern Wisconsin and the Upper Peninsula of Michigan. These wells are located in the
#	Western Lake Michigan Drainages (WMIC) NAWQA study unit. 
#		
#	Data were used to test for statistically significant difference in radon-222 concentrations
#	in samples from Sandstone and Carbonate aquifers. These tests were done separately for
#	the UMIS and WMIC study areas to eliminate any variable due to geographic location.  
# 
#--------------------------------------------------------------------------------------------------------
#  REPORT ARCHIVAL DATA SET: camord_radon_nawqa_resample.txt 
#
#	This data set contains NAWQA groundwater data for radon-222 samples collected twice at 29 wells.
#	The first sample date was 1995 or 1996 and the second sample date was 2002.
#	Data were used to evaluate the temporal variability of radon-222 concentrations in the subject report. 
# 
#
#--------------------------------------------------------------------------------------------------------
#  REPORT ARCHIVAL DATA SET: camord_trace_nawqa_mdl.txt   
#
#	This data set contains NAWQA groundwater data for trace elements that were used to 
#	compute summary statistics for the subject report. These data were also used to test 
#	for statistically significant differences between regional confinement and tritium-based 
#	age, and for plotting as boxplots. 
#
#	Some constituents include left-censored data (non-detections). For these constituents,
#	parametric summary statistics are based on ROS (Regression on Ordered Statistics).
#		
#	Non-detections were recensored from Laboratory Reporting Levels to Long-Term Method Detection
#	Levels that applied to the sample date
#
#--------------------------------------------------------------------------------------------------------
#  REPORT ARCHIVAL DATA SET: camord_trace_rad_all.txt   
#
#	This data set contains groundwater data from multiple sources (not just NAWQA) for 
#	trace elements, a few major ions, radionuclides, and physical properties for wells completed 
#	in the Cambrian-Ordovician Aquifer System. 
#	These data were used to map selected water-quality constituents throughout the aquifer system. 
#	These data were also used to test for statistically significant differences in concentrations 
#	of selected constituents between regionally confined wells and regionally unconfined wells. 
#	Regionally confined areas are defined in this report as being covered by the 
#	Upper Ordovician Maquoketa Shale or younger bedrock.    
#
#	Sample dates range as far back as 1960 to as recent as 2008.
#
#	USGS samples for trace elements and radium are filtered, as are samples from the ISWS.
#	Trace element and radium samples from all other sources are presumed to be unfiltered.
#
#
#--------------------------------------------------------------------------------------------------------
#  REPORT ARCHIVAL DATA SET: trace.summary.code.txt   
#
#	This S-PLUS script computes left-censored summary statistics for NAWQA Trace Element data
#	It also computes summary statistics and quantiles for Barium and Strontium which do not have 
#	censored data.
#
#
#--------------------------------------------------------------------------------------------------------
#  REPORT ARCHIVAL DATA SET: camord_water_use_data.txt   
#
#	This data set contains water-use data for those states where the Cambrian-Ordovician aquifer
#	system is used. Data are for the three major categories of use (public supply, self-supplied
#	industrial, irrigation) for which data were compiled by Maupin and Barber (2005). States
#	with water-use data include: Illinois, Iowa, Michigan, Minnesota, Missouri, and Wisconsin.
# 
#	Water-use data were used in the introduction of the subject report to show the significance of the
#	aquifer system in those states.
#
#	Data were from the year 2000, and were obtained from Maupin and Barber (2005).
#	The data will be used in a report to characterize the Cambrian-Ordovician Aquifer System 
#	as part of the U.S. Geological Survey, National Water-Quality Assessment Program.
#
#
#--------------------------------------------------------------------------------------------------------
END