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February 10, 2023 <br /> Lab No. : STK233O636 <br /> San Joaquin County EHD <br /> Customer No. : 3017919 <br /> Quality Control -Wet Chem <br /> LCS mg/L 0.5000 102% 86-114 <br /> BS mg/L 0.5000 103% 86-114 <br /> BSD mg/L 0.5000 100% 86-114 <br /> BSRPD mg/L 0.5000 2.6% <_5 <br /> Definition <br /> Blank : Method Blank-Prepared to verify that the preparation process is not contributing contamination to the samples. <br /> BS : Blank Spikes-A blank is spiked with a known amount of analyte.It is prepared to verify that the preparation process is not affecting <br /> analyte recovery. <br /> BSD : Blank Spike Duplicate of BS/BSD pair-A blank duplicate is spiked with a known amount of analyte.It is prepared to verify that the <br /> preparation process is not affecting analyte recovery. <br /> BSRPD : BS/BSD Relative Percent Difference(RPD)-The BS relative percent difference is an indication of precision for the preparation and <br /> analysis. <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 7 of 7 Page 7 of 7 <br />