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November 4, 2022 Lab No. : STK2255140 San Joaquin County EHD Customer No. : 3017919 Quality Control -Wet Chem =1 (CC 2283719-003) MSD mg/L 30.00 94.5% 74-126 MSRPD mg/L 10.00 9.8% <_20 MS mg/L 30.00 99.6% 74-126 (CC 2283793-001) MSD mg/L 30.00 101 % 74-126 MSRPD mg/L 10.00 1.2% :520 Sulfate 300.0 10/21/2022:21209OLDM Blank mg/L ND <0.5 LCS mg/L 50.00 96.9% 90-110 MS mg/L 100.0 94.1 % 82-124 (CC 2283719-003) MSD mg/L 100.0 85.6% 82-124 MSRPD mg/L 10.00 6.2% :523 MS mg/L 100.0 -3.6% 82-124 435 (CC 2283793-001) MSD mg/L 100.0 -7.7% 82-124 435 MSRPD mg/L 10.00 2.4% :523 MBAS 5540C 10/21/2022:212116JBA MS mg/L 10.00 100% 90-110 (SP 2216875-001) 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 7 of 7 Page 7 of 7