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December 9, 2022 <br /> Luhdorff& Scalmanini Consulting Lab No. : STK2256435 <br /> Customer No. : 3012023 <br /> Quality Control - Metals <br /> EVITIS in===3711 ITIN <br /> . ®� <br /> (STK2256435-002) MSD mg/L 12.00 69.1% <1A <br /> MSRPD mg/L 4000 1.2% 1520.0 <br /> Zinc 200.7 11/18/2022:213178AC MS ug/L 800.0 82.7% 75-125 <br /> (SP 2218261-004) MSD ug/L 800.0 82.2% 75-125 <br /> MSRPD ug/L 4000 0.6% :520.0 <br /> MS ug/L 800.0 84.0% 75-125 <br /> (STK2256435-002) MSD ug/L 800.0 83.4% 75-125 <br /> MSRPD ug/L 4000 0.7% :520.0 <br /> Definition <br /> <'A : High Sample Background-Spike concentration was less than one forth of the sample concentration. <br /> DQO : Data Quality Objective-This is the criteria against which the quality control data is compared. <br /> MS : Matrix Spikes-A random sample is spiked with a known amount of analyte.The recoveries are an indication of how that sample matrix <br /> affects analyte recovery. <br /> MSD : Matrix Spike Duplicate of MS/MSD pair-A random sample duplicate is spiked with a known amount of analyted.The recoveries are an <br /> indication of how that sample matrix affects analyte recovery. <br /> MSRPD : MS/MSD Relative Percent Difference(RPD)-The MS relative percent difference is an indication of precision for the preparation and <br /> analysis. <br /> ND : Non-detect-Result was below the DQO listed for the analyte. <br /> Page 14 of 17 Page 14 of 17 <br />