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July 1, 2022 <br />San Joaquin County EHD <br />Lab No. : STK2237542 <br />Customer No. :3017919 <br />Quality Control - Wet Chem <br />Wel <br />MS <br />mg/L <br />30.00 101 % 74-126 <br />(STK2237048-001) MSD <br />mg/L <br />30.00 92.6% 74-126 <br />MSRPD <br />mg/L <br />10.00 8.3% :520 <br />MS <br />mg/L <br />30.00 97.8% 74-126 <br />(CC 2281779-001) MSD <br />mg/L <br />30.00 96.9% 74-126 <br />MSRPD <br />mg/L <br />10.00 0.9% s20 <br />Sulfate <br />300.0 06101/2022:206081NJB Blank <br />mg/L <br />ND <0.5 <br />LCS <br />mg/L <br />50.00 103% 90-110 <br />MS <br />mg/L <br />100.0 102% 82-124 <br />(STK2237048-001) MSD <br />mg/L <br />100.0 93.9% 82-124 <br />MSRPD <br />mg/L <br />10.00 7.5% <_23 <br />MS <br />mg/L <br />100.0 91.4% 82-124 <br />(CC 2281779-001) MSD <br />mg/L <br />100.0 91.0% 82-124 <br />MSRPD <br />mg/L <br />10.00 0.3% <_23 <br />MBAS <br />5540C 06/01/2022:206276JBA MS <br />mg/L <br />10.00 100% 90-110 <br />(VI 2244011-001) MSD <br />mg/L <br />10.00 100% 90-110 <br />MSRPD <br />mg/L <br />10.00 0.0% :50.1 <br />Definition <br />Blank <br />: Method Blank - Prepared to verify that the preparation process is not contributing contamination <br />to the samples. <br />Dup <br />: Duplicate Sample - A random sample with each batch is prepared and analyzed in duplicate, <br />The relative percent difference is an <br />indication of precision for the preparation and analysis. <br />LCS <br />: Laboratory Control Standard/Sample - Prepared to verify that the preparation process <br />is not affecting analyte recovery. <br />MS <br />: 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 <br />: 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 <br />: MS/MSD Relative Percent Difference (RPD) - The MS relative percent difference is an <br />indication of precision for the preparation and <br />analysis. <br />ND <br />: Non -detect - Result was below the DQO listed for the analyte. <br />Page 7 of 7 Page 7 of 7 <br />