NCCA 2010 Sediment Chemistry Metadata for Assessed and Not_Assessed files.		
Revised 06.21.2016		
		
"“’Assessed’ data were used to develop the Good, Fair and Poor ratings in the report. ”"		
‘Not_Assessed’ data were not used to develop the ratings.		
		
"For questions about these data, please contact Hugh Sullivan at sullivan.hugh@epa.gov or use the Contact Us link on the webpage: http://www.epa.gov/national-aquatic-resource-surveys/forms/national-aquatic-resource-surveys-contact-us"		
"It is the responsibility of the end data user to become familiar with the QA codes used in the NCCA 2010 assessment (NCCA_QA_Codes.csv) and review the ""QA_CODES"" column in each dataset to determine whether the data meet quality objectives for specific uses."		
Location information for each site is contained in the SITEINFO File. Use UID as key column for merging data.		
		
Sediment Chemistry metadata		
		
Variable		Definition
		
UID		Unique identifier for the site/visit
SITE_ID		Site identifier
DATE_COL		Date the site visit occurred
STATE		State where the site is located
VISIT_NO		"Sequential visit in each year. ALL ASSESSED visits are Visit 1, so the VISIT_NO column is removed from the ASSESSMENT file."
PARAMETER		Code for parameter analyzed
PARAMETER_NAME		Name of parameter analyzed
PARAMETER_CAT		Analyte Category
CAS_NO		CAS Number 
RESULT		Value of parameter
UNITS		Units of measure
BATCH_ID		Laboratory Batch ID
MDL		Parameter Method Detection Limit
RL		Reporting Limit
MRL		Parameter Minimum Reporting Limit
PQL		Practical quantitation limit
DATE_ANALYZED		Date sample analyzed
HOLDING_TIME		# days between sample collection and analysis
LAB_SAMPLE_ID		Lab internal sample ID
SAMPLE_ID		NCCA assigned Sample ID
METHOD		Laboratory method
QA_CODES		Sample Qualifier code
		
** Change Log**		
		
"Date: June 21, 2016. Change to File Name: PREVIOUS FILE NAME: ASSESSED_NCCA2010_SEDIMENT CHEMISTRY.csv. NEW FILE NAME: ASSESSED_NCCA2010_SEDIMENT CHEMISTRY.REVISED.06.21.2016.csv."		
		
"Date: June 21, 2016. Change to Data in ASSESSED_NCCA2010_SEDIMENT_CHEMISTRY.REVISED.06.21.2016: Duplicate records for numerous sites were removed. Contaminant concentrations for several parameters at several sites were corrected. This change does not affect the results of the assessment."		
		
"Date: June 21, 2016. Change to File Name: PREVIOUS FILE NAME: NOTASSESSED_NCCA2010_SEDIMENT_CHEMISTRY.csv. NEW FILE NAME: NOTASSESSED_NCCA2010_SEDIMENT_CHEMISTRY.REVISED.06.21.2016.csv"		
		
"Date: June 21, 2016. Change to Data in NOTASSESSED_NCCA2010_SEDIMENT_CHEMISTRY.REVISED.06.21.2016.csv: Duplicate data at some sites removed. Contaminant concentrations for several parameters at several sites were corrected."