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7. LOQ: The laboratory shall demonstrate precision and bias at the LOQ for each analyte-matrix-method, including surrogates. The LOQ and associated precision and bias must meet client requirements and be available to be reported. 8. The LOQ shall be verified quarterly. LOQ verifications shall include routine cleanup steps, for methods where those cleanups might sometimes be employed. 9. If LOQ verification results are not consistent with initial precision and bias characterization, the precision and bias performance characteristics at the LOQ shall be recalculated. Clients with projects utilizing the lab's LOQ precision and bias values shall be notified of the change. 4r 9.3) Appendix 3 — MDL Flowcharts Initial MOL Determination I Preps re minimum of7 spikes at Each batch containing If no previous blank data. prepare If not a new method, 2-1 d times estimated MDL• replicate spikes and a minimum of 7 method blanks, use existing data up in 3 batches, method blank. in 3 batches. to 24 months earlier. on 3 different days Can use existing data un 3 different days from last 24 months. Analyze on 3 different days. Analyze an 3 different days. Fix problem and If multiple instruments, at least on meepleinst ixtract nstruments entsbe If multiple instruments• at least If not a repeat or spike ata 2s spikes analyzed on different as slongiasmintruments useexningdatew up P kf 2 blanks analyzed an different higher level calendar days each aslong as minimums to 24 months data up y satisfied. calendar days an each instrument ta24monthsearlier. instrument + I \ All results meet At leastsome _ Stop. qualitative I❑ Clanks produce �� f•113Lb does 4 criteria? numericresults? not apply, o-nly Mf?L will be used Calculate MDL from blanks. 99th percentile used Calculate MDL from spikes. MDLb_Avg +f x 5b if not all blanks IODL.=f x S� produce a numeric ` or990hperrentiie �,lDLs }MDLb? Ye= _ V Final MDL= WDLs Final h1DL= MDLb