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December 17, 2025 <br /> Lab No. : STK2558219 <br /> Luhdorff& Scalmanini Consulting <br /> Customer No. : 3012023 <br /> Quality Control - Metals <br /> ow, ®� § . <br /> (STK2558219-003) MSD mg/L 12.00 63.2% <1/4 <br /> MSRPD mg/L 0.1% <_20.0 <br /> Zinc 200.7 12/02/2025:213469AC MS ug/L 800.0 80.4% 75-125 <br /> (SP 2520524-001) MSD ug/L 800.0 81.4% 75-125 <br /> MSRPD ug/L 1.2% :520.0 <br /> MS ug/L 800.0 81.6% 75-125 <br /> (STK2558219-003) MSD ug/L 800.0 85.1% 75-125 <br /> MSRPD ug/L 4.1% :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 />