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December 18, 2023 Lab No. : STK2356366 San Joaquin County EHD Customer No. : 3017919 Quality Control - Metals LCS mg/L 12.00 88.7% 85-115 MS mg/L 12.00 98.1% 75-125 (CH 2379817-001) MSD mg/L 12.00 99.0% 75-125 MSRPD mg/L 0.6% :_20.0 MS mg/L 12.00 93.2% 75-125 (SP 2319613-001) MSD mg/L 12.00 103% 75-125 MSRPD mg/L 3.3% :520.0 Sodium 200.7 11/30/2023:213565EJC Blank mg/L ND <1 LCS mg/L 12.00 91.7% 85-115 MS mg/L 12.00 100% 75-125 (CH 2379817-001) MSD mg/L 12.00 101% 75-125 MSRPD mg/L 0.4% :520.0 MS mg/L 12.00 71.2% <'A 406 (SP 2319613-001) MSD mg/L 12.00 103% 75-125 MSRPD mg/L 4.8% :520.0 Zinc 200.7 11/30/2023:213565EJC Blank mg/L ND <0.02 LCS mg/L 0.8000 105% 85-115 MS mg/L 0.8000 99.9% 75-125 (CH 2379817-001) MSD mg/L 0.8000 100% 75-125 MSRPD mg/L 0.5% :520 MS mg/L 0.8000 22.4% <'A 406 (SP 2319613-001) MSD mg/L 0.8000 69.1% <1/4 MSRPD mg/L 4.1% :520 Definition Blank : Method Blank-Prepared to verify that the preparation process is not contributing contamination to the samples. DQO : Data Quality Objective-This is the criteria against which the quality control data is compared. 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 406 Matrix Spike(MS)not within the Acceptance Range(AR)because of high analyte concentration in the sample.Data was accepted based on the LCS or CCV recovery. Page 6 of 8 Page 6 of 8