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January 29, 2026 <br /> San Joaquin County EHD Lab No. : STK2630707 <br /> Customer No. : 3017919 <br /> Quality Control -Wet Chem <br /> Wet Chem <br /> Alkalinity(as CaCO3) 2320B (STK2630598-002) Dup mg/L 0.2% 10 <br /> Bicarbonate 2320B (STK2630598-002) Dup mg/L 0.2% 10 <br /> Carbonate 2320B (STK2630598-002) Dup mg/L 0% 10 <br /> E.C. 2320B (STK2630598-002) Dup umhos/cm 0.4% 5 <br /> Hydroxide 2320B (STK2630598-002) Dup mg/L 0% 10 <br /> Solids,Total Dissolved 2540CE 01/19/2026:200597CTL Blank mg/L ND <20 <br /> LCS mg/L 990.5 97.3% 90-110 <br /> (VI2640263-001) Dup mg/L 1% 5 <br /> (VI2640263-001) Dup mg/L 5.10% 5 440 <br /> Chloride 300.0 01/22/2026:200764LDM Blank mg/L ND <1 <br /> LCS mg/L 25.00 103% 90-110 <br /> MS mg/L 50.00 99.7% 67-117 <br /> (VI2640263-003) MSD mg/L 50.00 100% 67-117 <br /> MSRPD mg/L 0.4% :57 <br /> MS mg/L 50.00 79.3% 67-117 <br /> (VI2640263-007) MSD mg/L 50.00 83.1% 67-117 <br /> MSRPD mg/L 1.8% <_7 <br /> Fluoride 300.0 01/22/2026:200764LDM 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 /> (VI2640263-003) MSD mg/L 5.000 108% 89-111 <br /> MSRPD mg/L 0.3% 59 <br /> MS mg/L 5.000 106% 89-111 <br /> (VI2640263-007) MSD mg/L 5.000 106% 89-111 <br /> MSRPD mg/L 0.3% :59 <br /> Sulfate 300.0 01/22/2026:200764LDM Blank mg/L ND <0.5 <br /> LCS mg/L 50.00 104% 90-110 <br /> MS mg/L 100.0 107% 18-165 <br /> (VI2640263-003) MSD mg/L 100.0 107% 18-165 <br /> MSRPD mg/L 0.4% :57 <br /> MS mg/L 100.0 97.4% 18-165 <br /> (VI2640263-007) MSD mg/L 100.0 97.7% 18-165 <br /> MSRPD mg/L 0.2% :57 <br /> Nitrate 4500NO3F 01/16/2026:200540MM1 Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 95.1% 80-120 <br /> MS mg/L 5.609 95.4% 66-125 <br /> (VI2640262-001) MSD mg/L 5.609 93.4% 66-125 <br /> MSRPD mg/L 1.3% :530.4 <br /> Nitrate+Nitrite as N 4500NO3F O1/16/2026:200540MM1 Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 95.1% 80-120 <br /> MS mg/L 5.609 95.4% 66-125 <br /> (VI2640262-001) MSD mg/L 5.609 93.4% 66-125 <br /> MSRPD mg/L 1.3% 1530.4 <br /> Nitrate Nitrogen 4500NO3F 01/16/2026:200540MM1 Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 95.1% 80-120 <br /> MS mg/L 5.609 95.4% 66-125 <br /> (VI2640262-001) MSD mg/L 5.609 93.4% 66-125 <br /> MSRPD mg/L 1.3% :530.4 <br /> Nitrite as Nitrogen 4500NO3F 01/16/2026:200565MM1 Blank mg/L ND <0.2 <br /> LCS mg/L 1.218 105% 80-120 <br /> Page 7 of 8 Page 7 of 8 <br />