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June 5, 2023 Lab No. : STK2335650 San Joaquin County EHD Customer No. : 3017919 Quality Control -Wet Chem =1 (STK2335650-001) MSD mg/L 30.00 105% 74-126 MSRPD mg/L 10.00 2.2% <_20 MS mg/L 30.00 102% 74-126 (STK2335638-001) MSD mg/L 30.00 106% 74-126 MSRPD mg/L 10.00 3.6% :520 Sulfate 300.0 05/05/2023:204935LDM Blank mg/L ND <0.5 LCS mg/L 50.00 104% 90-110 MS mg/L 100.0 96.4% 82-124 (STK2335650-001) MSD mg/L 100.0 98.5% 82-124 MSRPD mg/L 10.00 1.5% :523 MS mg/L 100.0 101 % 82-124 (STK2335638-001) MSD mg/L 100.0 104% 82-124 MSRPD mg/L 10.00 3.1% :523 MBAS 5540C 05/05/2023:204913KRH MS mg/L 1.000 100% 90-110 (STK2335638-001) 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. 440 Sample nonhomogeneity may be affecting this analyte.Data was accepted based on the LCS or CCV recovery. Page 9 of 9 Page 9 of 9