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February 5, 2024 Lab No. : STK2430783 San Joaquin County EHD Customer No. : 3017919 Quality Control -Wet Chem . ®� mmcm Wet Chem Alkalinity(as CaCO3) 2320B (SP 2400825-004) Dup mg/L 0.2% 10 Bicarbonate 2320B (SP 2400825-004) Dup mg/L 0.2% 10 E.C. 2320B (SP 2400825-004) Dup umhos/cm 0.2% 5 Solids,Total Dissolved 2540CE 01/16/2024:200602CTL Blank mg/L ND <20 LCS mg/L 991.5 98.6% 90-110 (VI 2440356-001) Dup mg/L 1.80% 5 (VI 2440356-001) Dup mg/L 2.02% 5 Chloride 300.0 01/26/2024:201038LDM Blank mg/L ND <1 LCS mg/L 25.00 104% 90-110 MS mg/L 50.00 92.5% 67-117 (CH 2470512-001) MSD mg/L 50.00 92.7% 67-117 MSRPD mg/L 0.1% :_7 Fluoride 300.0 01/26/2024:201038LDM Blank mg/L ND <0.1 LCS mg/L 2.500 103% 90-110 MS mg/L 5.000 105% 89-111 (CH 2470512-001) MSD mg/L 5.000 103% 89-111 MSRPD mg/L 1.8% :59 Sulfate 300.0 01/26/2024:201038LDM Blank mg/L ND <0.5 LCS mg/L 50.00 104% 90-110 MS mg/L 100.0 104% 18-165 (CH 2470512-001) MSD mg/L 100.0 104% 18-165 MSRPD mg/L 0.1% :57 Nitrite as Nitrogen 4500NO2B O1/13/2024:200577AMM MS mg/L 0.2284 95.8% 1-173 (STK2430811-001) MSD mg/L 0.2284 97.6% 1-173 MSRPD mg/L 1.9% :520 Nitrate 4500NO3F 01/15/2024:200576ILP Blank mg/L ND <0.4 LCS mg/L 11.22 94.9% 80-120 MS mg/L 5.609 94.6% 66-125 (STK2430783-001) MSD mg/L 5.609 105% 66-125 MSRPD mg/L 10.3% :530.4 Nitrate+Nitrite as N 4500NO3F 01/15/2024:200576ILP Blank mg/L ND <0.4 LCS mg/L 11.22 94.9% 80-120 MS mg/L 5.609 94.6% 66-125 (STK2430783-001) MSD mg/L 5.609 105% 66-125 MSRPD mg/L 10.3% :530.4 Nitrate Nitrogen 4500NO3F 01/15/2024:200576ILP Blank mg/L ND <0.4 LCS mg/L 11.22 94.9% 80-120 MS mg/L 5.609 94.6% 66-125 (STK2430783-001) MSD mg/L 5.609 105% 66-125 MSRPD mg/L 10.3% :530.4 MBAS 5540C 01/13/2024:200548AMM MS mg/L 1.000 100% 90-110 (STK2430811-001) MSD mg/L 1.000 100% 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. Page 8 of 8 Page 8 of 8