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February 10, 2023 Lab No. : STK23312O1 San Joaquin County EHD Customer No. : 3017919 Quality Control -Wet Chem =1 (VI 2340468-001) MSD mg/L 30.00 102% 74-126 MSRPD mg/L 10.00 8.0% <_20 MS mg/L 30.00 94.5% 74-126 (VI 2340471-001) MSD mg/L 30.00 99.8% 74-126 MSRPD mg/L 10.00 5.5% :520 Sulfate 300.0 01/26/2023:200924LDM Blank mg/L ND <0.5 LCS mg/L 50.00 99.0% 90-110 MS mg/L 100.0 94.4% 82-124 (VI 2340468-001) MSD mg/L 100.0 102% 82-124 MSRPD mg/L 10.00 8.0% :523 MS mg/L 100.0 94.8% 82-124 (VI 2340471-001) MSD mg/L 100.0 100% 82-124 MSRPD mg/L 10.00 5.1% :523 MBAS 5540C 01/26/2023:200980JBA MS mg/L 1.000 100% 90-110 (STK2331199-001) MSD mg/L 1.000 100% 90-110 MSRPD mg/L 1.000 0.0% :50.1 Definition Blank : Method Blank-Prepared to verify that the preparation process is not contributing contamination to the samples. Dup : Duplicate Sample-A random sample with each batch is prepared and analyzed in duplicate.The relative percent difference is an indication of precision for the preparation and analysis. LCS : Laboratory Control Standard/Sample-Prepared to verify that the preparation process is not affecting analyte recovery. MS : Matrix Spikes-A random sample is spiked with a known amount of analyte.The recoveries are an indication of how that sample matrix affects analyte recovery. MSD : Matrix Spike Duplicate of MS/MSD pair-A random sample duplicate is spiked with a known amount of analyted.The recoveries are an indication of how that sample matrix affects analyte recovery. MSRPD : MS/MSD Relative Percent Difference(RPD)-The MS relative percent difference is an indication of precision for the preparation and analysis. ND : Non-detect-Result was below the DQO listed for the analyte. Explanation 435 Sample matrix may be affecting this analyte.Data was accepted based on the LCS or CCV recovery. Page 7 of 7 Page 7 of 7