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September 12, 2022 Lab No. : STK2252062 San Joaquin County EHD Customer No. : 3017919 Quality Control -Wet Chem MS mg/L 30.00 101 % 74-126 (VI 2246139-001) MSD mg/L 30.00 102% 74-126 MSRPD mg/L 10.00 0.9% :520 MS mg/L 30.00 101 % 74-126 (VI 2246196-002) MSD mg/L 30.00 101 % 74-126 MSRPD mg/L 10.00 0.2% <_20 Sulfate 300.0 08/25/2022:209696LDM Blank mg/L ND <0.5 LCS mg/L 50.00 101 % 90-110 MS mg/L 100.0 98.6% 82-124 (VI 2246139-001) MSD mg/L 100.0 99.6% 82-124 MSRPD mg/L 10.00 0.9% :523 MS mg/L 100.0 98.5% 82-124 (VI 2246196-002) MSD mg/L 100.0 98.7% 82-124 MSRPD mg/L 10.00 0.2% :523 MBAS 5540C 08/25/2022:209823JBA MS mg/L 10.00 100% 90-110 (SP 2213721-001) 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 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