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January 23, 2026 <br /> Lab No. : STK263O487 <br /> San Joaquin County EHD <br /> Customer No. : 3017919 <br /> Quality Control -Wet Chem <br /> Wet Chem <br /> Alkalinity(as CaCO3) 2320B (VI 2640228-001) Dup mg/L 0.9% 10 <br /> Bicarbonate 2320B (VI2640228-001) Dup mg/L 3.51% 10 <br /> Carbonate 2320B (VI2640228-001) Dup mg/L 3.70% 10 <br /> E.C. 2320B (VI 2640228-001) Dup umhos/cm 0% 5 <br /> Hydroxide 2320B (VI2640228-001) Dup mg/L 3.70% 10 <br /> Solids,Total Dissolved 2540CE O1/14/2026:200439CTL Blank mg/L ND <10 <br /> LCS mg/L 991.1 100% 90-110 <br /> (STK2630339-001) Dup mg/L 3.16% 12.2 <br /> (STK2630339-001) Dup mg/L 3.39% 12.2 <br /> Chloride 300.0 01/15/2026:200479LDM Blank mg/L ND <1 <br /> LCS mg/L 25.00 103% 90-110 <br /> MS mg/L 50.00 105% 67-117 <br /> (STK2630393-001) MSD mg/L 50.00 104% 67-117 <br /> MSRPD mg/L 0.2% :57 <br /> MS mg/L 50.00 101% 67-117 <br /> (STK2630556-001) MSD mg/L 50.00 101% 67-117 <br /> MSRPD mg/L 0.1% :57 <br /> Fluoride 300.0 01/15/2026:200479LDM Blank mg/L ND <0.1 <br /> LCS mg/L 2.500 101% 90-110 <br /> MS mg/L 5.000 107% 89-111 <br /> (STK2630393-001) MSD mg/L 5.000 107% 89-111 <br /> MSRPD mg/L 0.1% :59 <br /> MS mg/L 5.000 105% 89-111 <br /> (STK2630556-001) MSD mg/L 5.000 104% 89-111 <br /> MSRPD mg/L 0.4% 59 <br /> Sulfate 300.0 01/15/2026:200479LDM Blank mg/L ND <0.5 <br /> LCS mg/L 50.00 103% 90-110 <br /> MS mg/L 100.0 107% 18-165 <br /> (STK2630393-001) MSD mg/L 100.0 107% 18-165 <br /> MSRPD mg/L 0.2% :57 <br /> MS mg/L 100.0 104% 18-165 <br /> (STK2630556-001) MSD mg/L 100.0 104% 18-165 <br /> MSRPD mg/L 0.1% <_7 <br /> Nitrate 4500NO3F O1/13/2026:200360MM1 Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 95.8% 80-120 <br /> MS mg/L 5.609 94.3% 66-125 <br /> (VI2640170-001) MSD mg/L 5.609 96.6% 66-125 <br /> MSRPD mg/L 1.8% :530.4 <br /> Nitrate+Nitrite as N 4500NO3F O1/13/2026:200360MM1 Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 95.8% 80-120 <br /> MS mg/L 5.609 94.3% 66-125 <br /> (VI2640170-001) MSD mg/L 5.609 96.6% 66-125 <br /> MSRPD mg/L 1.8% <_30.4 <br /> Nitrate Nitrogen 4500NO3F 01/13/2026:200360MM1 Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 95.8% 80-120 <br /> MS mg/L 5.609 94.3% 66-125 <br /> (VI2640170-001) MSD mg/L 5.609 96.6% 66-125 <br /> MSRPD mg/L 1.8% :530.4 <br /> Nitrite as Nitrogen 4500NO3F O1/13/2026:200383MM1 Blank mg/L ND <0.2 <br /> LCS mg/L 1.218 103% 80-120 <br /> Page 7 of 8 Page 7 of 8 <br />