#  Begin METADATA documentation
#--------------------------------------------------------------------------------------------------
#  DATASET_NAME: censoring.txt	
#  DATASET_DESCRIPTION:	Data set that contains hostiry of repoting levels and long-term 
#                       method detection levels for the elemaments data from the National Water
#                       Quality Labortory for report SIR2009-5006
#			
#  DATA_SET FORMAT: ascii-text, comma-delimited
#  DATA_SET URL: http://water.usgs.gov/nawqa-only/aq/data_archive/SIR2009_5006_Data.zip
#
#--------------------------------------------------------------------------------------------------
#  REPORT TITLE: Occurrence and distribution of iron, manganese, and selected trace elements in
#                groundwater in the glacial aquifer system of the northern United States
#               	
# 
#  REPORT SERIES/NUMBER: USGS Scientific Investigations Report 2009-5006     
#  REPORT URL: http://pubs.er.usgs.gov/usgspubs/sir/sir20095006
#
#--------------------------------------------------------------------------------------------------
#  NAWQA STUDY:	Principal Aquifer: Glacial aquifer system	
#
#--------------------------------------------------------------------------------------------------
#
#  METADATA DATE:    May 15, 2009	
#  METADATA CONTACT: George Groschen	
#                    U.S. Geological Survey
#                    Illinois Water Science Center	
#                    1201 W University Ave, Suite 100	
#	 	             Urbana, IL 61801
#	
#                    	voice: (217)328-9713
#                    	email:  gegrosch@usgs.gov
#
#  SECONDARY CONTACT:  Terri Arnold
#                      Same address as above
#                    	
#                    	voice: (217)328-9702
#                    	email: tlarnold@usgs.gov  
#
# -------------------------------------------------------------------------------------------------
#  METADATA Data Description:  
#
#  ABSTRACT:  This data set contains the methods, reporting level type, reporting levels,
#             and long-term method detection level, if assigned for the trace element
#             and iron and managanese data for all wells retrieved from the internal
#             National Water Quality Laboratory (NWQL) "Current and Historical Reporting
#             level information"  web site on May  2006.
#	      http://nwql.cr.usgs.gov/usgs/ltmdl/ltmdl.cfm
#             The data was used in SIR 2009-5006 to characterize 
#             Occurrence and distribution of iron, manganese, and selected 
#             trace elements as part of the U.S. Geological Survey, National 
#             Water-Quality Assessment Program.	
#
#     For reporting type "LRL" the lrl is set to 2X LT-MDL to reduce the reporting of 
#     false negatives. See "New reporting procedures based on long-term method detection levels 
#     and some considerations for interpretations of water-quality data provided by the U.S. 
#     Geological Survey National Water Quality Laboratory, USGS Open-file report 99-193
#     Childress, Carolyn J. Oblinger; Foreman, William T.; Connor, Brooke F.; Maloney, Thomas J.
#
#
#     The following is a comma-delimited file of the contents of Table 3 in 
#     the report SIR2009-5006.
#
#     Abbreviations used in data file:
#
#     MRL, method reporting level; LRL, laboratory reporting level; na, not applicable; 
#     in the table below, "na" gnerally indicates that the method/reporting level was still in
#     use at the time of retrieval (May 2007)
#     DCP-AES, Direct-Coupled Plasma, Atomic Emission Spectroscopy; GF-AAS, Graphite-Furnace  
#     Atomic Absorption Spectrophotometry; HG-AAS, Hydride Generation Atomic Absorption
#     Spectrophotometry; ICP-AES, Inductively Coupled Atomic Emission Spectroscopy; 
#     ICP-MS, Inductively Coupled Mass Spectrometry
#
#--------------------------------------------------------------------------------
#  METADATA Detailed documentation of dataset elements:
#--------------------------------------------------------------------------------
#
#       DATA FIELD LABEL:  Element (Symbol)
#       Data Field Description:	Name of element and chemical symbol
#	Data Field Length/Type:	12s
#	Data Units:		none
#       Data Source: NWQL web site	
#       Retrieval Date:	May 2007	
#		
#
#       DATA FIELD LABEL:  NWQL method
#       Data Field Description: Abbreviated method name (see above)
#	Data Field Length/Type:	12s
#	Data Units: none
#       Data Source: NWQL web site
#       Retrieval Date: May 2007
#
#       DATA FIELD LABEL:  Start date
#       Data Field Description:	Date method/reporting level instituted
#	Data Field Length/Type:	date
#	Data Units:	mm/dd/yyy
#       Data Source: NWQL		
#       Retrieval Date:	May 2007
#		
#
#       DATA FIELD LABEL:  End date
#       Data Field Description: Date method/reporting level discontinued
#	Data Field Length/Type:	date
#	Data Units: mm/dd/yy
#       Data Source: NWQL
#       Retrieval Date: May 2007
#
#       DATA FIELD LABEL: Type of reporting
#       Data Field Description:	NWQL assigned reporting type
#	Data Field Length/Type:	12s
#	Data Units:	none
#       Data Source: NWQL		
#       Retrieval Date:	May 2007	
#		
#
#       DATA FIELD LABEL:  Long-term method detection level
#       Data Field Description: NWQL-assigend LT-MDL. (See OFR 99-193, above)
#	Data Field Length/Type:	12s
#	Data Units: micrograms per liter
#       Data Source: NWQL
#       Retrieval Date: May 2007
#
#
#       DATA FIELD LABEL: Reporting level 	
#       Data Field Description:	The actual reporting level for the result (less than value)
#	Data Field Length/Type:	12s
#	Data Units:	micrograms per liter
#       Data Source: NWQL		
#       Retrieval Date:	MAY 2007
#
#------------------------------------------------------------------------------------------------
Element (symbol),NWQL method,Start date,End date,Type of reporting,Long-term method detection level,Reporting level
Antimony (Sb),HG-AAS,1/1/92,9/30/98,MRL,na,1
Antimony (Sb),ICP-MS,10/17/94,9/30/00,MRL,na,1
Antimony (Sb),ICP-MS,10/1/00,9/30/02,LRL,0.024,0.048
Antimony (Sb),ICP-MS,10/1/02,9/30/03,LRL,.15,.3
Antimony (Sb),ICP-MS,10/1/03,na,LRL,.1,.2
Arsenic (As),HG-AAS,1/1/92,9/30/98,MRL,na,1
Arsenic (As),GF-AAS,10/1/98,9/30/99,MRL,na,1
Arsenic (As),ICP-MS,9/1/99,9/30/00,MRL,na,.9
Arsenic (As),ICP-MS,10/1/00,9/30/02,LRL,.09,.18
Arsenic (As),ICP-MS,10/1/02,9/30/03,LRL,.13,.26
Arsenic (As),ICP-MS,10/1/03,na,LRL,.1,.2
Barium (Ba),ICP-AES,1/1/92,12/30/97,MRL,na,2
Barium (Ba),ICP-AES,12/31/97,9/30/98,MRL,na,1
Barium (Ba),ICP-MS,10/17/94,9/30/02,MRL,na,1
Barium (Ba),ICP-MS,10/1/02,9/30/03,LRL,.03,.05
Barium (Ba),ICP-MS,10/1/03,na,LRL,.1,.2
Beryllium (Be),ICP-AES,1/1/92,12/22/97,MRL,na,.5
Beryllium (Be),ICP-AES,12/23/97,9/30/98,MRL,na,1
Beryllium (Be),ICP-AES,10/1/98,10/17/00,LRL,.8,1.6
Beryllium (Be),ICP-AES,10/18/00,9/30/01,LRL,.5,1
Beryllium (Be),ICP-AES,10/1/01,4/30/03,LRL,.3,.5
Beryllium (Be),ICP-AES,5/1/03,9/30/04,LRL,.2,.4
Beryllium (Be),ICP-AES,10/1/04,na,LRL,.1,.2
Beryllium (Be),ICP-MS,10/17/94,9/30/00,MRL,na,1
Beryllium (Be),ICP-MS,10/1/00,na,LRL,.03,.06
Cadmium (Cd),ICP-AES,1/1/92,12/22/97,MRL,na,1
Cadmium (Cd),ICP-AES,12/23/97,9/30/98,MRL,na,8
Cadmium (Cd),ICP-AES,10/1/98,4/30/03,LRL,3,8
Cadmium (Cd),ICP-AES,5/1/03,9/30/03,LRL,1.2,2
Cadmium (Cd),ICP-AES,10/1/03,9/30/04,LRL,1.6,3.2
Cadmium (Cd),ICP-AES,10/1/04,na,LRL,1,2
Cadmium (Cd),GF-AAS,1/1/92,9/30/99,MRL,na,1
Cadmium (Cd),GF-AAS,10/1/99,9/30/01,LRL,.07,.14
Cadmium (Cd),GF-AAS,10/1/01,9/30/02,LRL,.06,.12
Cadmium (Cd),GF-AAS,10/1/02,na,LRL,.11,.22
Cadmium (Cd),ICP-MS,10/17/94,9/30/00,MRL,na,1
Cadmium (Cd),ICP-MS,10/1/00,9/30/02,LRL,.018,.037
Cadmium (Cd),ICP-MS,10/1/02,9/30/03,LRL,.018,.037
Cadmium (Cd),ICP-MS,10/1/03,na,LRL,.02,.04
Chromium (Cr),ICP-AES,1/1/92,12/21/97,MRL,na,5
Chromium (Cr),ICP-AES,12/23/97,9/30/98,MRL,na,14
Chromium (Cr),ICP-AES,10/1/98,10/17/00,LRL,7,14
Chromium (Cr),ICP-AES,10/18/00,4/30/03,LRL,5,10
Chromium (Cr),ICP-AES,5/1/03,9/30/03,LRL,2.4,5
Chromium (Cr),ICP-AES,10/1/03,9/30/04,LRL,2.1,4.2
Chromium (Cr),ICP-AES,10/1/04,na,LRL,1,2
Chromium (Cr),DCP-AES,1/1/92,10/11/94,MRL,na,1
Chromium (Cr),ICP-MS,10/17/94,3/8/01,MRL,na,1
Chromium (Cr),GF-AAS,1/1/92,9/30/99,MRL,na,1
Chromium (Cr),GF-AAS,10/1/99,na,LRL,0.4,0.8
Cobalt (Co),ICP-AES,1/1/92,12/21/97,MRL,na,3
Cobalt (Co),ICP-AES,12/23/97,9/30/98,MRL,na,12
Cobalt (Co),ICP-AES,10/1/98,9/30/99,LRL,4,7
Cobalt (Co),ICP-AES,10/1/99,9/30/01,LRL,6,13
Cobalt (Co),ICP-AES,10/1/01,9/30/02,LRL,7,13
Cobalt (Co),ICP-AES,10/1/02,4/30/03,LRL,4,8
Cobalt (Co),ICP-AES,5/1/03,9/30/03,LRL,1.7,3
Cobalt (Co),ICP-AES,10/1/03,9/30/04,LRL,1.3,2.6
Cobalt (Co),ICP-AES,10/1/04,na,LRL,1,2
Cobalt (Co),ICP-MS,10/17/94,9/30/00,MRL,na,1
Cobalt (Co),ICP-MS,10/1/00,9/30/03,LRL,.007,.015
Cobalt (Co),ICP-MS,10/1/03,na,LRL,.007,.014
Copper (Cu),ICP-AES,1/1/92,9/30/98,MRL,na,10
Copper (Cu),ICP-AES,10/1/98,10/17/00,LRL,5,10
Copper (Cu),ICP-AES,10/18/00,9/30/01,LRL,2.4,4.7
Copper (Cu),ICP-AES,10/1/01,4/30/03,LRL,2.9,5.8
Copper (Cu),ICP-AES,5/1/03,9/30/03,LRL,3.4,7
Copper (Cu),ICP-AES,10/1/03,9/30/04,LRL,2.5,5
Copper (Cu),ICP-AES,10/1/04,na,LRL,1,2
Copper (Cu),ICP-MS,10/17/94,9/30/00,MRL,na,1
Copper (Cu),ICP-MS,10/1/00,9/30/02,LRL,.12,.23
Copper (Cu),ICP-MS,10/1/02,9/30/03,LRL,.12,.23
Copper (Cu),ICP-MS,10/1/03,na,LRL,.2,.4
Iron (Fe),ICP-AES,1/1/92,12/22/97,MRL,na,3
Iron (Fe),ICP-AES,12/23/97,9/30/98,MRL,na,10
Iron (Fe),ICP-AES,10/1/98,4/30/03,LRL,5,10
Iron (Fe),ICP-AES,5/1/03,9/30/03,LRL,3.8,8
Iron (Fe),ICP-AES,10/1/03,9/30/04,LRL,3.2,6.4
Iron (Fe),ICP-AES,10/1/04,na,LRL,3,6
Lead (Pb),ICP-AES,1/1/92,12/21/97,MRL,na,10
Lead (Pb),ICP-AES,12/23/97,9/30/98,MRL,na,100
Lead (Pb),ICP-AES,10/1/98,na,LRL,50,100
Lead (Pb),GF-AAS,1/1/92,9/30/99,MRL,na,1
Lead (Pb),GF-AAS,10/1/99,na,LRL,0.5,1
Lead (Pb),ICP-MS,10/17/94,9/30/00,MRL,na,1
Lead (Pb),ICP-MS,10/1/00,na,LRL,.04,0.08
Lithium (Li),ICP-AES,1/1/92,9/30/98,MRL,na,4
Lithium (Li),ICP-AES,10/1/98,9/30/99,LRL,3,6
Lithium (Li),ICP-AES,10/1/99,4/30/03,LRL,1.9,3.9
Lithium (Li),ICP-AES,5/1/03,9/30/03,LRL,1.4,3
Lithium (Li),ICP-AES,10/1/03,9/30/04,LRL,1.5,3
Lithium (Li),ICP-AES,10/1/04,na,LRL,1,2
Lithium (Li),ICP-MS,9/1/99,9/30/00,MRL,na,.3
Lithium (Li),ICP-MS,10/1/00,9/30/02,LRL,.15,.3
Lithium (Li),ICP-MS,10/1/02,9/30/03,LRL,.25,.5
Lithium (Li),ICP-MS,10/1/03,na,LRL,.3,.6
Manganese (Mn),ICP-AES,1/1/92,12/21/97,MRL,na,1
Manganese (Mn),ICP-AES,12/23/97,9/30/98,MRL,na,4
Manganese (Mn),ICP-AES,10/1/98,9/30/99,LRL,1.5,3
Manganese (Mn),ICP-AES,10/1/99,10/17/00,LRL,1.1,2.2
Manganese (Mn),ICP-AES,10/18/00,9/30/01,LRL,1.6,3.2
Manganese (Mn),ICP-AES,10/1/01,4/30/03,LRL,.8,1.6
Manganese (Mn),ICP-AES,5/1/03,9/30/03,LRL,.2,.4
Manganese (Mn),ICP-AES,10/1/03,9/30/04,LRL,.4,.8
Manganese (Mn),ICP-AES,10/1/04,na,LRL,.3,.6
Manganese (Mn),ICP-MS,8/26/97,9/30/00,MRL,na,1
Manganese (Mn),ICP-MS,10/1/00,9/30/02,LRL,.05,.1
Manganese (Mn),ICP-MS,10/1/02,9/30/03,LRL,.09,.18
Manganese (Mn),ICP-MS,10/1/03,na,LRL,.1,.2
Molybdenum (Mo),ICP-AES,1/1/92,12/21/97,MRL,na,10
Molybdenum (Mo),ICP-AES,12/23/97,9/30/98,MRL,na,60
Molybdenum (Mo),ICP-AES,10/1/98,9/30/99,LRL,25,50
Molybdenum (Mo),ICP-AES,10/1/99,10/17/00,LRL,17,34
Molybdenum (Mo),ICP-AES,10/18/00,9/30/02,LRL,23,45
Molybdenum (Mo),ICP-AES,10/1/02,4/30/03,LRL,15,30
Molybdenum (Mo),ICP-AES,5/1/03,9/30/04,LRL,2,4
Molybdenum (Mo),ICP-AES,10/1/04,na,LRL,2,4
Molybdenum (Mo),ICP-MS,10/17/94,9/30/00,MRL,na,1
Molybdenum (Mo),ICP-MS,10/1/00,9/30/02,LRL,.1,.2
Molybdenum (Mo),ICP-MS,10/1/02,9/30/03,LRL,.17,.33
Molybdenum (Mo),ICP-MS,10/1/03,na,LRL,.2,.4
Nickel (Ni),ICP-AES,1/1/92,12/22/97,MRL,na,10
Nickel (Ni),ICP-AES,12/23/97,9/30/98,MRL,na,40
Nickel (Ni),ICP-AES,10/1/98,10/17/00,LRL,17,40
Nickel (Ni),ICP-AES,10/18/00,9/30/01,LRL,27,53
Nickel (Ni),ICP-AES,10/1/01,4/30/03,LRL,14,29
Nickel (Ni),ICP-AES,5/1/03,9/30/03,LRL,3.3,7
Nickel (Ni),ICP-AES,10/1/03,na,LRL,1,2
Nickel (Ni),ICP-MS,10/17/94,9/30/00,MRL,na,1
Nickel (Ni),ICP-MS,10/1/00,na,LRL,0.03,0.06
Selenium (Se),HG-AAS,1/1/92,9/30/98,MRL,na,1
Selenium (Se),GF-AAS,10/1/98,9/30/99,MRL,na,1
Selenium (Se),GF-AAS,10/1/99,9/30/01,LRL,1.2,2.4
Selenium (Se),GF-AAS,10/1/01,9/30/02,LRL,1,2
Selenium (Se),GF-AAS,10/1/02,na,LRL,1.3,2.6
Selenium (Se),ICP-MS,9/1/99,9/30/00,MRL,na,.7
Selenium (Se),ICP-MS,10/1/00,9/30/02,LRL,.17,.33
Selenium (Se),ICP-MS,10/1/02,9/30/03,LRL,.25,.5
Selenium (Se),ICP-MS,10/1/03,na,LRL,.2,.4
Silver (Ag),ICP-AES,1/1/92,12/22/97,MRL,na,1
Silver (Ag),ICP-AES,12/23/97,9/30/98,MRL,na,4
Silver (Ag),ICP-AES,10/1/98,9/30/99,LRL,1.8,4
Silver (Ag),ICP-AES,10/1/99,10/17/00,LRL,4,7
Silver (Ag),ICP-AES,10/18/00,9/30/01,LRL,2.3,4.6
Silver (Ag),ICP-AES,10/1/01,4/30/03,LRL,5,9
Silver (Ag),ICP-AES,5/1/03,9/30/03,LRL,2.3,5
Silver (Ag),ICP-AES,10/1/03,na,LRL,1.4,2.8
Silver (Ag),ICP-MS,10/17/94,5/11/01,MRL,na,1
Silver (Ag),ICP-MS,5/12/01,9/30/02,MRL,na,1
Silver (Ag),ICP-MS,10/1/02,na,LRL,.1,.2
Strontium (Sr),ICP-AES,1/1/92,12/22/97,MRL,na,.5
Strontium (Sr),ICP-AES,12/23/97,9/30/98,MRL,na,1
Strontium (Sr),ICP-AES,10/1/98,10/17/00,LRL,.5,1
Strontium (Sr),ICP-AES,10/18/00,9/30/01,LRL,.4,.8
Strontium (Sr),ICP-AES,10/1/01,4/30/03,LRL,.3,.6
Strontium (Sr),ICP-AES,5/1/03,9/30/03,LRL,.2,.4
Strontium (Sr),ICP-AES,10/1/03,9/30/04,LRL,.7,1.4
Strontium (Sr),ICP-AES,10/1/04,na,LRL,.5,1
Strontium (Sr),ICP-MS,9/1/99,9/30/00,MRL,na,0.2
Strontium (Sr),ICP-MS,10/1/00,9/30/02,LRL,.04,.08
Strontium (Sr),ICP-MS,10/1/02,9/30/03,LRL ,.1,.2
Strontium (Sr),ICP-MS,10/1/03,na,LRL,.2,.4
Thallium (Tl),GF-AAS,7/1/99,7/31/99,MRL,na,0.5
Thallium (Tl),ICP-MS,10/17/94,6/1/01,MRL,na,1
Thallium (Tl),ICP-MS,9/1/99,9/30/00,MRL,na,0.9
Thallium (Tl),ICP-MS,10/1/00,na,LRL,0.02,0.041
Uranium (U),ICP-MS,10/17/94,9/30/00,MRL,na,1
Uranium (U),ICP-MS,10/1/00,9/30/03,LRL,.009,.018
Uranium (U),ICP-MS,10/1/03,na,LRL,.02,.04
Vanadium (V),ICP-AES,1/1/92,12/22/97,MRL,na,6
Vanadium (V),ICP-AES,12/23/97,9/30/98,MRL,na,10
Vanadium (V),ICP-AES,10/1/98,10/17/00,LRL,5,10
Vanadium (V),ICP-AES,10/18/00,4/30/03,LRL,4,8
Vanadium (V),ICP-AES,5/1/03,9/30/03,LRL,3,6
Vanadium (V),ICP-AES,10/1/03,9/30/04,LRL,2.3,4.6
Vanadium (V),ICP-AES,10/1/04,na,LRL,1,2
Vanadium (V),ICP-MS,10/15/99,9/30/00,MRL,na,1
Vanadium (V),ICP-MS,10/1/00,9/30/02,LRL,.1,.2
Vanadium (V),ICP-MS,10/1/02,9/30/03,LRL,.07,.13
Vanadium (V),ICP-MS,10/1/03,na,LRL,.07,.14
Zinc (Zn),ICP-AES,1/1/92,12/30/97,MRL,na,3
Zinc (Zn),ICP-AES,12/31/97,9/30/98,MRL,na,20
Zinc (Zn),ICP-AES,10/1/98,9/30/99,LRL,7,20
Zinc (Zn),ICP-AES,10/1/99,9/30/01,LRL,10,20
Zinc (Zn),ICP-AES,10/1/01,4/30/03,LRL,12,24
Zinc (Zn),ICP-AES,5/1/03,9/30/03,LRL,1.6,3
Zinc (Zn),ICP-AES,10/1/03,9/30/04,LRL,1.5,3
Zinc (Zn),ICP-AES,10/1/04,na,LRL,3,6
Zinc (Zn),GF-AAS,1/1/92,12/31/93,MRL,na,.2
Zinc (Zn),ICP-MS,10/17/94,9/30/02,MRL,na,1
Zinc (Zn),ICP-MS,10/1/02,9/30/03,LRL,.5,1
Zinc (Zn),ICP-MS,10/1/03,na,LRL,.3,.6
