# # National Water Information System # 2024/03/28 # # # Date Retrieved: USGS Water Data for the Nation Help System # val_qual_cd val_qual_nm 1s 62s $ incorrect sample container & biological organism estimated as dominant ( blank greater than the sample-specific Critical Level ) sample-specific MDC (ssMDC) above contractual MDC * sample was warm when received + improper preservation / matrix spike (MS) recovery outside of acceptable range = negative result may indicate potential negative bias @ holding time exceeded a value extrapolated at high end b value extrapolated at low end c see result laboratory comment d sample was diluted e see result field comment f sample field preparation problem g count less than 0.5 percent h compound identification verified by alternate method i result may be affected by interference j count greater than or equal to 15 percent (dominant) k counts outside acceptable range l sample preparation problem m value is highly variable by this method n below the reporting level but at or above the detection level o result determined by alternate method p value reported is preferred q insufficient sample received r value verified by rerun, same method s instrument sensitivity problem t below the detection level u value reported not confirmable, interference v analyte detected in laboratory blank w high variability, questionable precision and accuracy x interference from sample matrix y sample variability described in comment z value verified by rerun, alternate method \ lab control sample (LCS) recovery outside of range or criteria ^ yield outside of contractually acceptable range ~ duplicates do not check (not within the acceptance limits)