This file contains provisional Sediment Toxicity Test Control Summary data for National Coastal Condition Assessment. These data are used to establish control survival for comparison to sample survival for tests run in the same BATCH_ID (CONTROL_ID).															
"See Sediment Toxicity Control Replicate, Sediment Toxicity Sample Replicate and Sediment Toxicity Sample Summary data files for more information."															
"Preliminary quality reviews of these data have been completed. However, they are not considered to be final until the National Coastal Condition Assessment 2020 & 21 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.                                               															
"Please bring any questions about the data to the attention of Hugh Sullivan, NCCA Lead at sullivan.hugh@epa.gov.                                              "															
                                                															
                                                															
This file does not include information used to determine the statistical weight for each site. Future updates of the SiteInfo file will include site weights.                                           															
Future publications of the SITEINFO Files will include information about site weights                                           															
                                                															
                                                															
"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"															
															
															
PUBLICATION_DATE			Date data file was published to the NARS webpage												
SAMPLE_TYPE			Code identifying sample type												
TEST_TYPE			Test Type (Marine/Freshwater)												
TYPE			Control or Sample test.												
SEDIMENT_LOAD_DATE			Date sediment was loaded into test chambers												
SEDIMENT_LOAD_TIME			time of day sediment was loaded into test chambers												
ORGANISM_LOAD_DATE			Time test organisms were loaded into test chambers. Method calls for organism load date and time to be 24 hours later than sediment load date and time. Minor deviations are allowable.												
ORGANISM_LOAD_TIME			Date test organisms were loaded into test chambers. Method calls for organism load date and time to be 24 hours later than sediment load date and time. Minor deviations are allowable.												
START_DATE			Date toxicity test began												
END_DATE			Date toxicity test ended. The NCCA uses 10 day acute toxicity tests												
NUM_REPS			Number of replicates tested for the cample or control. Standard for NCCA Freshwater samples is 4 replicates. Standard for Marine Samples is 5 replicates.												
NUM_ORG			Standard number of organisms to be loaded into a test chamber. NCCA Freshwater samples and controls have a standard of 10 organisms loaded per chamber. Marine samples and controls have a standard of 20 organims per chamber.												
CONTROL			Describes the type of clean control sediment that was used for the control sample tests. Typically freshwater NCCA samples are compared to clean control artificial sediment. Marine NCCA samples are compared to clean control natural sediment.												
BATCH_ID			BATCH_ID for connecting Control tests to sample tests.												
CONTROL_ID			Identifying code for control test associated with each batch. Used as BATCH_ID for connecting Control tests to sample tests.												
CBF_BATCH			Control Batch Failure: Did the Control Survival meet QC requirement for FW or Marine samples? P or {blank} = Pass. F = Fail. Samples processed in batches with CBF = F have been deprecated and are not used in NCCA Analysis.												
LAB			Lab that conducted analysis												
MEAN_NUM_SURV			Mean number organism surviving across sample replicates. See Control Replicate file for individual replicate results.										VARIABLE	LEGAL_VALUES	DESCRIPTION
SD_NUM_SURV			Standard deviation of number survived												
MEAN_REPLICATE_PER_SURVIVAL			Mean percent of organism survival aross sample replicates. See Control Replicate file for individual replicate results.												
ACCEPTABILITY_THRESHOLD			"Required minimum average survival threshold for control samples. Minimum for Freshwater tests is 0.8 or 80%. Minimum for Marine tests is 0.9 or 90%. If the average control survival does not meet the minimum threshold, all samples tested in the batch must be repeated."												
SD_PER_SURV			Standard deviation percent survival												
NARS_FLAG			NARS flag. ND = Nondetect; H = holding time issue (holding times for each analyte may be found in the Laboratory Operation Manual https://www.epa.gov/sites/default/files/2016-05/documents/ncca_2015_qapp_version_2.1.pdf); S = shipping issue; L = Less than reporting limit but above MDL; Q = other quality issue. See comment.												
NARS_COMMENT			Comment explaining NARS_FLAG or LAB_COMMENT if necessary												
															
															
															
CHANGE LOG															
															
DATE		ACTION													
10/25/2022		Initial publication of provisional data to the National Aquatic Resource Suveys Data Page