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March 21, 2023 Lab No. : STK2333O64 San Joaquin County EHD Customer No. : 3017919 Quality Control -Wet Chem LCS mg/L 15.00 97.5% 90-110 MS mg/L 30.00 101 % 74-126 (SP 2303307-001) MSD mg/L 30.00 94.4% 74-126 MSRPD mg/L 10.00 6.3% <_20 MS mg/L 30.00 100% 74-126 (SP 2303158-001) MSD mg/L 30.00 98.3% 74-126 MSRPD mg/L 10.00 2.2% :520 Sulfate 300.0 03/09/2023:202645LDM Blank mg/L ND <0.5 LCS mg/L 50.00 97.9% 90-110 MS mg/L 100.0 98.0% 82-124 (SP 2303307-001) MSD mg/L 100.0 92.2% 82-124 MSRPD mg/L 10.00 5.0% :523 MS mg/L 100.0 96.4% 82-124 (SP 2303158-001) MSD mg/L 100.0 94.3% 82-124 MSRPD mg/L 10.00 1.6% <_23 MBAS 5540C 03/10/2023:202635KRH MS mg/L 1.000 100% 90-110 (STK2333064-001) MSD mg/L 1.000 100% 90-110 MSRPD mg/L 1.000 0.0% 150.1 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 440 Sample nonhomogeneity may be affecting this analyte.Data was accepted based on the LCS or CCV recovery. Page 7 of 7 Page 7 of 7