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Ongoing Data Collection <br /> Each quarter prepare and Not required in quarters in which <br /> analyze minimum of 2 spikes parameter is not analyzed, <br /> on each instrument, using <br /> same spike concentration as One method blank per batch is sufficient. <br /> used in initial study <br /> Repeat preparation and All results <br /> analysis of spikes one time. By — <br /> end of year can have no more no positive & meet <br /> than 5% unusable results. If a qualitative ID <br /> seems likely that will have > 5% <br /> non-numeric results, may want <br /> to repeat initial MDL study now <br /> at higher concentration. �= <br /> Data saved for use in annual <br /> MDL re-evaluation <br />