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November 12, 2025 <br />San Joaquin County EHD <br />Lab No. :STK2556626 <br />Customer No. :3017919 <br />Quality Control - Wet Chem <br />MS <br />mg/L <br />0.6090 <br />98.5% <br />50-150 <br />(SP 2518410-001) <br />MSD <br />mg/L <br />0.6090 <br />98.5% <br />50-150 <br />MSRPD <br />mg/L <br />0.0% <br /><_30 <br />MBAS (Screen) 5540C 10/28/2025:212118MCT <br />MS <br />mg/L <br />10.00 <br />100% <br />90-110 <br />(STK2556626-001) <br />MSD <br />mg/L <br />10.00 <br />100% <br />90-110 <br />MSRPD <br />mg/L <br />0.0% <br />: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 />Page 8 of 8 Page 8 of 8 <br />