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June 10, 2024 <br /> Luhdorff& Scalmanini Consulting Lab Customer <br /> : STK2437367 <br /> No. : 3012023 <br /> Quality Control- Metals <br /> (STK2437367-005) MSD mg/L 12.00 65.2% <1/4 <br /> MSRPD mg/L 2.1% <_20.0 <br /> Zinc 200.7 05/23/2024:205794AC MS ug/L 800.0 84.7% 75-125 <br /> (SP 2408199-001) MSD ug/L 800.0 96.7% 75-125 <br /> MSRPD ug/L 13.0% :520.0 <br /> MS ug/L 800.0 95.9% 75-125 <br /> (STK2437367-005) MSD ug/L 800.0 85.7% 75-125 <br /> MSRPD ug/L 10.6% :520.0 <br /> Definition <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 /> Explanation <br /> 406 Matrix Spike(MS)not within the Acceptance Range(AR)because of high analyte concentration in the sample.Data was accepted based <br /> on the LCS or CCV recovery. <br /> Page 13 of 17 Page 13 of 17 <br />