"This file contains data about estuarine and Great Lakes results for sites that were sampled for the National Coastal Condition Assessment in 2020 and 2021."	

Data have been thoroughly reviewed, however they are not considered final until the NCCA Report is published. Data may be updated at any time. The changelog for the associated file may be found below the column name definitions.              

End-users are responsible for reviewing the suitability of these data for their purposes.     

"""For information about NCCA protocols, please check the NCCA 2020 Field Operations Manual, Site Evaluation Guidelines; Lab Operations Manual, and Quality Assurance Project Plan on the NCCA Website: https://www.epa.gov/national-aquatic-resource-surveys/manuals-used-national-aquatic-resource-surveys#National%20Coastal%20Condition%20Assessment"""		

"""Please bring any questions about the data to the attention of Hugh Sullivan, NCCA Lead at sullivan.hugh@epa.gov. ""                                             
		
		
PUBLICATION_DATE		Date the dataset was published to the NARS site
LAB		Code for laboratory used to analyze sample
SAMPLE_TYPE		Code identifying sample type
TEST_TYPE		Test Type (Marine/Freshwater)
BATCH_ID		Laboratory batch number
SAMPLE_ID		Number identifying the sample
ORGANISM		Name of organism used in toxicity testing. Freshwater sample test organism is Hyalella azteca. Estuarine sample test organism is Leptocheirus plumulosus.
START_DATE		Start date of test
END_DATE		End date of test
BATCH_SAMPLES		Number of samples tested in batch
BATCH_PASS		"Did the Control Survival meet QC requirement for FW or Marine samples? P = Pass, F = Fail"
CONTROL		Source of Control substrate
MEAN_CTRL_NSURV		Mean control number  of surviving organisms
PROP_SURVIVAL		Proportion of organisms surviving
SD_CTRL_NSURV		Standard deviation of number of surviving organisms for controls
SD_CTRL_PSURV		Standard deviation of proportion of surviving organisms for controls
NARS_FLAG		NARS Flag. ND = Nondetect; H = holding time issue; S = shipping issue; L = Less than reporting limit but above MDL; NR = No result reported; Q = other quality issue. See NARS_COMMENT.
		
Changelog		
		
Publication Date 
Of Most recent
File Posted to
NARS Data Page 
        		Change
09/04/2024		Initial publication