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October 6, 2026 <br /> Lab No. : STK2654537 <br /> San Joaquin County EHD <br /> Customer No. : 3017919 <br /> Quality Control -Wet Chem <br /> . ®� MMCM <br /> Wet Chem <br /> Alkalinity(as CaCO3) 2320B (VI 2646992-001) Dup mg/L 0.4% 10 <br /> Bicarbonate 2320B (VI 2646992-001) Dup mg/L 0.4% 10 <br /> Carbonate 2320B (VI 2646992-001) Dup mg/L 0% 10 <br /> E.C. 2320B (VI 2646992-001) Dup umhos/cm 1.05% 5 <br /> Hydroxide 2320B (VI 2646992-001) Dup mg/L 0% 10 <br /> Solids,Total Dissolved 2540CE 09/28/2026:211341CTL Blank mg/L ND <20 <br /> LCS mg/L 991.5 105% 90-110 <br /> (VI 2647029-001) Dup mg/L 3.54% 5 <br /> (VI 2647029-001) Dup mg/L 4.43% 5 <br /> Chloride 300.0 09/30/2026:211469LDM Blank mg/L ND <1 <br /> LCS mg/L 25.00 105% 90-110 <br /> MS mg/L 50.00 103% 67-117 <br /> (VI 2646918-001) MSD mg/L 50.00 103% 67-117 <br /> MSRPD mg/L 0.2% :57 <br /> MS mg/L 50.00 104% 67-117 <br /> (STK2651956-007) MSD mg/L 50.00 104% 67-117 <br /> MSRPD mg/L 0.1% :57 <br /> Fluoride 300.0 09/30/2026:211469LDM Blank mg/L ND <0.1 <br /> LCS mg/L 2.500 104% 90-110 <br /> MS mg/L 5.000 108% 89-111 <br /> (VI 2646918-001) MSD mg/L 5.000 108% 89-111 <br /> MSRPD mg/L 0.1% :59 <br /> MS mg/L 5.000 107% 89-111 <br /> (STK2651956-007) MSD mg/L 5.000 106% 89-111 <br /> MSRPD mg/L 0.0% :59 <br /> Sulfate 300.0 09/30/2026:211469LDM Blank mg/L ND <0.5 <br /> LCS mg/L 50.00 106% 90-110 <br /> MS mg/L 100.0 106% 18-165 <br /> (VI 2646918-001) MSD mg/L 100.0 106% 18-165 <br /> MSRPD mg/L 0.2% :57 <br /> MS mg/L 100.0 105% 18-165 <br /> (STK2651956-007) MSD mg/L 100.0 105% 18-165 <br /> MSRPD mg/L 0.0% :57 <br /> Nitrate 450ONO3F 09/25/2026:211235MM1 Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 96.0% 80-120 <br /> MS mg/L 5.609 94.5% 66-125 <br /> (SP 2618382-001) MSD mg/L 5.609 92.2% 66-125 <br /> MSRPD mg/L 2.3% :530.4 <br /> Nitrate+Nitrite as N 450ONO3F 09/25/2026:211235MM1 Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 96.0% 80-120 <br /> MS mg/L 5.609 94.5% 66-125 <br /> (SP 2618382-001) MSD mg/L 5.609 92.2% 66-125 <br /> MSRPD mg/L 2.3% :530.4 <br /> Nitrate Nitrogen 450ONO3F 09/25/2026:211235MM1 Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 96.0% 80-120 <br /> MS mg/L 5.609 94.5% 66-125 <br /> (SP 2618382-001) MSD mg/L 5.609 92.2% 66-125 <br /> MSRPD mg/L 2.3% 1530.4 <br /> Nitrite as Nitrogen 450ONO3F 09/25/2026:211277MM1 Blank mg/L ND <0.2 <br /> LCS mg/L 1.218 98.5% 80-120 <br /> Page 7 of 8 <br />