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<br />July 1, 2022 <br />San Joaquin County EHD Lab No.: STK2237542 <br />Customer No.: 3017919 <br /> <br />Quality Control - Wet Chem <br />Constituent Method Date/ID Type Units Conc.QC Data DQO Note <br />MS mg/L 30.00 101 %74-126 <br />(STK2237048-001)MSD mg/L 30.00 92.6 %74-126 <br />MSRPD mg/L 10.00 8.3%≤20 <br />MS mg/L 30.00 97.8 %74-126 <br />(CC 2281779-001)MSD mg/L 30.00 96.9 %74-126 <br />MSRPD mg/L 10.00 0.9%≤20 <br />Sulfate 300.0 06/01/2022:206081NJB Blank mg/L ND <0.5 <br />LCS mg/L 50.00 103 %90-110 <br />MS mg/L 100.0 102 %82-124 <br />(STK2237048-001)MSD mg/L 100.0 93.9 %82-124 <br />MSRPD mg/L 10.00 7.5%≤23 <br />MS mg/L 100.0 91.4 %82-124 <br />(CC 2281779-001)MSD mg/L 100.0 91.0 %82-124 <br />MSRPD mg/L 10.00 0.3%≤23 <br />MBAS 5540C 06/01/2022:206276JBA MS mg/L 10.00 100%90-110 <br />(VI 2244011-001)MSD mg/L 10.00 100%90-110 <br />MSRPD mg/L 10.00 0.0%≤0.1 <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 />ND :Non-detect - Result was below the DQO listed for the analyte.