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November 16, 2022 Lab No. : STK2255037 San Joaquin County EHD Customer No. : 3017919 Quality Control -Wet Chem MS mg/L 30.00 104% 74-126 (SP 2216708-001) MSD mg/L 30.00 82.4% 74-126 MSRPD mg/L 10.00 23.4% :520 435 MS mg/L 30.00 83.1 % 74-126 (STK2254936-004) MSD mg/L 30.00 89.4% 74-126 MSRPD mg/L 10.00 7.3% <_20 Sulfate 300.0 11/14/2022:212995LDM Blank mg/L ND <0.5 LCS mg/L 50.00 99.3% 90-110 MS mg/L 100.0 96.1 % 82-124 (VI 2248226-002) MSD mg/L 100.0 98.4% 82-124 MSRPD mg/L 50.00 1.9% :523 MS mg/L 100.0 83.5% 82-124 (VI 2248226-003) MSD mg/L 100.0 101 % 82-124 MSRPD mg/L 50.00 15.0% :523 MBAS 5540C 10/19/2022:212112JBA MS mg/L 10.00 100% 90-110 (SP 2216671-001) 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. Page 8 of 8 Page 8 of 8