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March 21, 2023 Lab No. : STK2332742 San Joaquin County EHD Customer No. : 3017919 Quality Control -Wet Chem (CH 2371299-001) MSD mg/L 30.00 97.2% 74-126 MSRPD mg/L 10.00 4.0% <_20 MS mg/L 30.00 95.1 % 74-126 (CH 2371298-001) MSD mg/L 30.00 102% 74-126 MSRPD mg/L 10.00 7.1% :520 Sulfate 300.0 03/02/2023:202364LDM Blank mg/L ND <0.5 LCS mg/L 50.00 93.8% 90-110 MS mg/L 100.0 93.2% 82-124 (CH 2371299-001) MSD mg/L 100.0 97.0% 82-124 MSRPD mg/L 10.00 3.9% :523 MS mg/L 100.0 95.3% 82-124 (CH 2371298-001) MSD mg/L 100.0 102% 82-124 MSRPD mg/L 10.00 6.4% :523 MBAS 5540C 03/02/2023:202323KRH MS mg/L 1.000 100% 90-110 (STK2332742-001) 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