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July 16, 2026 Lab No. : STK2650005 <br /> San Joaquin County EHD Customer No. : 3017919 <br /> Quality Control - Wet Chem <br /> WIM <br /> MS mg/L 0.6090 103% 50-150 <br /> (STK2639853-001) MSD mg/L 0.6090 102% 50-150 <br /> MSRPD mg/L 1.6% :530 <br /> MBAS(Screen) 5540C 07/08/2026:207764MCT MS mg/L 10.00 100% 90-110 <br /> (STK2639901-001) MSD mg/L 10.00 100% 90-110 <br /> MSRPD mg/L 0.0% :50.1 <br /> Definition <br /> Blank : Method Blank-Prepared to verify that the preparation process is not contributing contamination to the samples. <br /> Dup : Duplicate Sample-A random sample with each batch is prepared and analyzed in duplicate.The relative percent difference is an <br /> indication of precision for the preparation and analysis. <br /> LCS : Laboratory Control Standard/Sample-Prepared to verify that the preparation process is not affecting analyte recovery. <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 /> Explanation <br /> 435 Sample matrix may be affecting this analyte.Data was accepted based on the LCS or CCV recovery. <br /> Page 8 of 8 Page 8 of 8 <br /> I <br />