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October 14, 2022 <br /> San Joaquin County EHD Lab om 301791 2817 <br /> Customer No. : 3017919 <br /> Quality Control - Wet Chem <br /> MEMMEMtMEMO= ® t . ® ® a <br /> (VI 2246203-001 ) MSD mg/L 30.00 105 % 74-126 <br /> MSRPD mg/L 50.00 6 .0% <20 <br /> MS mg/L 30.00 96, 5 % 74-126 <br /> (VI 2246203-005) MSD mg/L 30.00 104 % 74-126 <br /> MSRPD mg/L 5.000 7 .3% :520 <br /> Sulfate 300.0 09/09/2022 :210269LDM Blank mg/L ND <0.5 <br /> LCS mg/L 50.00 101 % 90-110 <br /> MS mg/L LOU 97,7 % 82-124 <br /> (VI 2246203-001 ) MSD mg/L 100.0 104 % 82-124 <br /> MSRPD mg/L 50.00 5. 3% 1523 <br /> MS mg/L 100.0 95,3 % 82-124 <br /> (VI 2246203-005) MSD mg/L 100.0 103 % 82-124 <br /> MSRPD mg/L 5 .000 6.4% 5523 <br /> MBAS 5540C 0910912022 : 210382JBA MS mg/L 10.00 100% 90-110 <br /> (SP 2214419-001 ) 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. <br /> Page 8 of 8 Page 8 of 8 <br />