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June 6, 2024 Lab No. : STK2437504 San Joaquin County EHD Customer No. : 3017919 Quality Control -Wet Chem Nitrite as Nitrogen 300.0 05/24/2024:205866LDM Blank mg/L ND <0.1 LCS mg/L 4.567 98.5% 90-110 MS mg/L 9.134 96.6% 88-111 (STK2437336-010) MSD mg/L 9.134 97.1% 88-111 MSRPD mg/L 0.5% :58 MS mg/L 9.134 96.0% 88-111 (STK2437336-005) MSD mg/L 9.134 96.3% 88-111 MSRPD mg/L 0.3% :58 Sulfate 300.0 05/24/2024:205866LDM Blank mg/L ND <0.5 LCS mg/L 50.00 101% 90-110 MS mg/L 100.0 85.7% 18-165 (STK2437336-010) MSD mg/L 100.0 85.7% 18-165 MSRPD mg/L 0.0% :57 MS mg/L 100.0 90.6% 18-165 (STK2437336-005) MSD mg/L 100.0 90.6% 18-165 MSRPD mg/L 0.0% :57 pH 4500-H B (STK2436150-042) Dup 0.6% 4.80 MBAS 5540C 05/24/2024:205900KRH MS mg/L 10.00 100% 90-110 (STK2437504-001) MSD mg/L 10.00 100% 90-110 MSRPD mg/L 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. 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