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February 10, 2023 Lab No. : STK233O537 San Joaquin County EHD Customer No. : 3017919 Quality Control -Wet Chem =1 (SP 2300536-002) MSD mg/L 30.00 102% 74-126 MSRPD mg/L 10.00 4.7% <_20 MS mg/L 30.00 92.5% 74-126 (SP 2300535-001) MSD mg/L 30.00 101 % 74-126 MSRPD mg/L 10.00 8.7% :520 Sulfate 300.0 01/13/2023:200390LDM Blank mg/L 1 <0.5 LCS mg/L 50.00 95.7% 90-110 MS mg/L 100.0 49.0% 82-124 435 (SP 2300536-002) MSD mg/L 100.0 51.2% 82-124 435 MSRPD mg/L 10.00 0.5% :523 MS mg/L 100.0 29.7% <1/4 (SP 2300535-001) MSD mg/L 100.0 34.6% <1/4 MSRPD mg/L 10.00 0.9% :523 MBAS 5540C 01/13/2023:200453JBA MS mg/L 1.000 100% 90-110 (SP 2300514-001) MSD mg/L 1.000 100% 90-110 MSRPD mg/L 1.000 0.0% :50.1 Definition <1/4 : High Sample Background-Spike concentration was less than one forth of the sample concentration. 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