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March 27, 2023 <br /> Lab No. : STK2332955 <br /> San Joaquin County EHD <br /> Customer No. : 3017919 <br /> Quality Control -Wet Chem <br /> LCS mg/L 15.00 96.1 % 90-110 <br /> MS mg/L 30.00 93.9% 74-126 <br /> (STK2332495-001) MSD mg/L 30.00 99.1 % 74-126 <br /> MSRPD mg/L 10.00 5.3% <_20 <br /> MS mg/L 30.00 95.4% 74-126 <br /> (SP 2303371-001) MSD mg/L 30.00 101 % 74-126 <br /> MSRPD mg/L 40.00 6.1% :520 <br /> Sulfate 300.0 03/08/2023:202613LDM Blank mg/L ND <0.5 <br /> LCS mg/L 50.00 96.8% 90-110 <br /> MS mg/L 100.0 89.6% 82-124 <br /> (STK2332495-001) MSD mg/L 100.0 94.2% 82-124 <br /> MSRPD mg/L 10.00 3.6% :523 <br /> MS mg/L 100.0 89.3% 82-124 <br /> (SP 2303371-001) MSD mg/L 100.0 95.2% 82-124 <br /> MSRPD mg/L 40.00 3.9% <_23 <br /> MBAS 5540C 03/08/2023:202572KRH MS mg/L 1.000 100% 90-110 <br /> (SP 2303414-001) MSD mg/L 1.000 100% 90-110 <br /> MSRPD mg/L 1.000 0.0% 150.1 <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 /> 435 Sample matrix may be affecting this analyte.Data was accepted based on the LCS or CCV recovery. <br /> 440 Sample nonhomogeneity 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 />