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October 18, 2022 Lab No. : STK2254407 San Joaquin County EHD Customer No. : 3017919 Quality Control -Wet Chem MS mg/L 30.00 106% 74-126 (VI 2248010-001) MSD mg/L 30.00 107% 74-126 MSRPD mg/L 10.00 1.2% :520 MS mg/L 30.00 113% 74-126 (STK2254407-001) MSD mg/L 30.00 105% 74-126 MSRPD mg/L 10.00 7.6% <_20 Sulfate 300.0 10/07/2022:211559LDM Blank mg/L ND <0.5 LCS mg/L 50.00 108% 90-110 MS mg/L 100.0 98.9% 82-124 (VI 2248010-001) MSD mg/L 100.0 100% 82-124 MSRPD mg/L 10.00 0.7% :523 MS mg/L 100.0 110% 82-124 (STK2254407-001) MSD mg/L 100.0 104% 82-124 MSRPD mg/L 10.00 4.7% :523 MBAS 5540C 10/07/2022:211523JBA MS mg/L 10.00 100% 90-110 (SP 2216080-001) MSD mg/L 10.00 100% 90-110 MSRPD mg/L 10.00 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