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January 20, 2026 Lab No. : STK2630257 <br /> San Joaquin County EHD <br /> Customer No. : 3017919 <br /> Quality Control -Wet Chem <br /> IMF M- Mi . WITAMM 1M <br /> Wet Chem <br /> Alkalinity(as CaCO3) 2320B (CC 2680134-001) Dup mg/L 0.5% 10 <br /> Bicarbonate 2320B (CC 2680134-001) Dup mg/L 0.5% 10 <br /> Carbonate 2320B (CC 2680134-001) Dup mg/L 0% 10 <br /> E.C. 2320B (CC 2680134-001) Dup umhos/cm 0.3% 5 <br /> Hydroxide 2320B (CC 2680134-001) Dup mg/L 0% 10 <br /> Solids,Total Dissolved 2540CE 01/09/2026:200249CTL Blank mg/L ND <20 <br /> LCS mg/L 991.1 97.0% 90-110 <br /> (VI2640112-007) Dup mg/L 0.09% 5 <br /> (VI2640112-007) Dup mg/L 1.27% 5 <br /> Chloride 300.0 01/12/2026:200318LDM Blank mg/L ND <1 <br /> LCS mg/L 25.00 106% 90-110 <br /> MS mg/L 50.00 92.4% 67-117 <br /> (CC 2680129-001) MSD mg/L 50.00 93.3% 67-117 <br /> MSRPD mg/L 0.4% :57 <br /> MS mg/L 50.00 98.2% 67-117 <br /> (CC 2680105-001) MSD mg/L 50.00 98.2% 67-117 <br /> MSRPD mg/L 0.0% 57 <br /> Fluoride 300.0 01/12/2026:200318LDM Blank mg/L ND <0.1 <br /> LCS mg/L 2.500 103% 90-110 <br /> MS mg/L 5.000 107% 89-111 <br /> (CC 2680129-001) MSD mg/L 5.000 106% 89-111 <br /> MSRPD mg/L 0.1% :59 <br /> MS mg/L 5.000 105% 89-111 <br /> (CC 2680105-001) MSD mg/L 5.000 105% 89-111 <br /> MSRPD mg/L 0.1% :59 <br /> Sulfate 300.0 01/12/2026:200318LDM Blank mg/L ND <0.5 <br /> LCS mg/L 50.00 106% 90-110 <br /> MS mg/L 100.0 93.0% 18-165 <br /> (CC 2680129-001) MSD mg/L 100.0 93.2% 18-165 <br /> MSRPD mg/L 0.1% _<7 <br /> MS mg/L 100.0 95.9% 18-165 <br /> (CC 2680105-001) MSD mg/L 100.0 95.8% 18-165 <br /> MSRPD mg/L 0.0% :57 <br /> Nitrate 450ONO3F 01/08/2026:200193MM1 Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 97.0% 80-120 <br /> MS mg/L 5.609 97.5% 66-125 <br /> (VI2640105-004) MSD mg/L 5.609 93.4% 66-125 <br /> MSRPD mg/L 4.2% :530.4 <br /> Nitrate+Nitrite as N 450ONO3F 01/08/2026:200193MM1 Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 97.0% 80-120 <br /> MS mg/L 5.609 97.5% 66-125 <br /> (VI2640105-004) MSD mg/L 5.609 93.4% 66-125 <br /> MSRPD mg/L 4.2% :530.4 <br /> Nitrate Nitrogen 450ONO3F 01/08/2026:200193MM1 Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 97.0% 80-120 <br /> MS mg/L 5.609 97.5% 66-125 <br /> (VI2640105-004) MSD mg/L 5.609 93.4% 66-125 <br /> MSRPD mg/L 4.2% <_30.4 <br /> Nitrite as Nitrogen 450ONO3F 01/08/2026:200222MM1 Blank mg/L ND <0.2 <br /> LCS mg/L 1.218 104% 80-120 <br /> Page 7 of 8 Page 7 of 8 <br />