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March 17, 2026 <br /> Lab No. : STK2632853 <br /> San Joaquin County EHD <br /> Customer No. : 3017919 <br /> Quality Control -Wet Chem <br /> Wet Chem <br /> Alkalinity(as CaCO3) 2320B (STK2633073-001) Dup mg/L 0.3% 10 <br /> Bicarbonate 2320B (STK2633073-001) Dup mg/L 0.3% 10 <br /> Carbonate 2320B (STK2633073-001) Dup mg/L 0% 10 <br /> E.C. 2320B (STK2633073-001) Dup umhos/cm 0% 5 <br /> Hydroxide 2320B (STK2633073-001) Dup mg/L 0% 10 <br /> Solids,Total Dissolved 2540CE 03/04/2026:202304CTL Blank mg/L ND <20 <br /> LCS mg/L 990.5 99.5% 90-110 <br /> (SP 2603680-001) Dup mg/L 5.94% 5 440 <br /> (SP 2603680-001) Dup mg/L 7.11% 5 440 <br /> Chloride 300.0 03/16/2026:202804LDM Blank mg/L ND <1 <br /> LCS mg/L 25.00 104% 90-110 <br /> MS mg/L 50.00 102% 67-117 <br /> (VI2641393-002) MSD mg/L 50.00 102% 67-117 <br /> MSRPD mg/L 0.1% 57 <br /> MS mg/L 50.00 66.5% 67-117 435 <br /> (VI2641503-001) MSD mg/L 50.00 71.0% 67-117 <br /> MSRPD mg/L 1.3% 57 <br /> Fluoride 300.0 03/16/2026:202804LDM Blank mg/L ND <0.1 <br /> LCS mg/L 2.500 102% 90-110 <br /> MS mg/L 5.000 106% 89-111 <br /> (VI2641393-002) MSD mg/L 5.000 107% 89-111 <br /> MSRPD mg/L 0.2% :59 <br /> MS mg/L 5.000 106% 89-111 <br /> (VI2641503-001) MSD mg/L 5.000 106% 89-111 <br /> MSRPD mg/L 0.1% :59 <br /> Sulfate 300.0 03/16/2026:202804LDM Blank mg/L ND <0.5 <br /> LCS mg/L 50.00 105% 90-110 <br /> MS mg/L 100.0 105% 18-165 <br /> (VI2641393-002) MSD mg/L 100.0 105% 18-165 <br /> MSRPD mg/L 0.2% :57 <br /> MS mg/L 100.0 102% 18-165 <br /> (VI2641503-001) MSD mg/L 100.0 102% 18-165 <br /> MSRPD mg/L 0.1% <_7 <br /> Nitrate 4500NO3F 03/03/2026:202258MM1 Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 96.8% 80-120 <br /> MS mg/L 5.609 94.5% 66-125 <br /> (CH 2671733-001) MSD mg/L 5.609 94.8% 66-125 <br /> MSRPD mg/L 0.3% :530.4 <br /> Nitrate+Nitrite as N 4500NO3F 03/03/2026:202258MM1 Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 96.8% 80-120 <br /> MS mg/L 5.609 94.5% 66-125 <br /> (CH 2671733-001) MSD mg/L 5.609 94.8% 66-125 <br /> MSRPD mg/L 0.3% <_30.4 <br /> Nitrate Nitrogen 4500NO3F 03/03/2026:202258MM1 Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 96.8% 80-120 <br /> MS mg/L 5.609 94.5% 66-125 <br /> (CH 2671733-001) MSD mg/L 5.609 94.8% 66-125 <br /> MSRPD mg/L 0.3% <_30.4 <br /> Nitrite as Nitrogen 4500NO3F 03/03/2026:202276MM1 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 />