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November 7, 2023 <br /> Lab No. : STK2354793 <br /> San Joaquin County EHD <br /> Customer No. : 3017919 <br /> Quality Control -Wet Chem <br /> =1 <br /> (SP 2317971-001) MSD mg/L 30.00 75.7% 88-111 435 <br /> MSRPD mg/L 40.00 0.8% <_8 <br /> MS mg/L 30.00 83.6% 88-111 435 <br /> (SP 2317950-001) MSD mg/L 30.00 83.8% 88-111 435 <br /> MSRPD mg/L 5.000 0.3% :58 <br /> Sulfate 300.0 10/25/2023:212184LDM Blank mg/L ND <0.5 <br /> LCS mg/L 50.00 99.5% 90-110 <br /> MS mg/L 100.0 77.5% 18-165 <br /> (SP 2317971-001) MSD mg/L 100.0 75.6% 18-165 <br /> MSRPD mg/L 40.00 0.8% :57 <br /> MS mg/L 100.0 95.7% 18-165 <br /> (SP 2317950-001) MSD mg/L 100.0 95.8% 18-165 <br /> MSRPD mg/L 5.000 0.04% :57 <br /> MBAS 5540C 10/25/2023:212132KRH MS mg/L 1.000 100% 90-110 <br /> (CC 2383759-001) MSD mg/L 1.000 100% 90-110 <br /> MSRPD mg/L 0.0% :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 /> ND : Non-detect-Result was below the DQO listed for the analyte. <br /> Explanation <br /> 406 Matrix Spike(MS)not within the Acceptance Range(AR)because of high analyte concentration in the sample.Data was accepted based <br /> on the LCS or CCV recovery. <br /> 435 Sample matrix may be affecting this analyte.Data was accepted based on the LCS or CCV recovery. <br /> Page 7 of 7 Page 7 of 7 <br />