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June 9, 2026 <br /> Lab No. : STK2637775 <br /> San Joaquin County EHD <br /> Customer No. : 3017919 <br /> Quality Control -Wet Chem <br /> Wet Chem <br /> Alkalinity(as CaCO3) 2320B (STK2637825-001) Dup mg/L 0.5% 10 <br /> Bicarbonate 2320B (STK2637825-001) Dup mg/L 0.7% 10 <br /> Carbonate 2320B (STK2637825-001) Dup mg/L 0% 10 <br /> E.C. 2320B (STK2637825-001) Dup umhos/cm 0.6% 5 <br /> Hydroxide 2320B (STK2637825-001) Dup mg/L 0% 10 <br /> Solids,Total Dissolved 2540CE O6/02/2026:206135CTL Blank mg/L ND <20 <br /> LCS mg/L 990.5 100% 90-110 <br /> (SP 2610788-002) Dup mg/L 2.32% 5 <br /> (SP 2610788-002) Dup mg/L 0.6% 5 <br /> Chloride 300.0 06/04/2026:206281LDM Blank mg/L ND <1 <br /> LCS mg/L 25.00 99.7% 90-110 <br /> MS mg/L 50.00 97.1% 67-117 <br /> (CH 2674527-002) MSD mg/L 50.00 97.3% 67-117 <br /> MSRPD mg/L 0.2% :57 <br /> MS mg/L 50.00 34.7% <'A 406 <br /> (SP 2610810-006) MSD mg/L 50.00 41.0% <1/4 <br /> MSRPD mg/L 1.3% 57 <br /> Fluoride 300.0 06/04/2026:206281LDM Blank mg/L ND <0.1 <br /> LCS mg/L 2.500 109% 90-110 <br /> MS mg/L 5.000 99.5% 89-111 <br /> (CH 2674527-002) MSD mg/L 5.000 98.8% 89-111 <br /> MSRPD mg/L 0.7% :59 <br /> MS mg/L 5.000 98.8% 89-111 <br /> (SP 2610810-006) MSD mg/L 5.000 98.3% 89-111 <br /> MSRPD mg/L 0.6% _<9 <br /> Sulfate 300.0 06/04/2026:206281LDM Blank mg/L ND <0.5 <br /> LCS mg/L 50.00 98.8% 90-110 <br /> MS mg/L 100.0 95.9% 18-165 <br /> (CH 2674527-002) MSD mg/L 100.0 96.3% 18-165 <br /> MSRPD mg/L 0.3% :57 <br /> MS mg/L 100.0 82.9% 18-165 <br /> (SP 2610810-006) MSD mg/L 100.0 83.1% 18-165 <br /> MSRPD mg/L 0.1% :57 <br /> Nitrate 4500NO3F 05/29/2026:206001MM1 Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 97.0% 80-120 <br /> MS mg/L 5.609 95.0% 66-125 <br /> (VI2643782-001) MSD mg/L 5.609 95.4% 66-125 <br /> MSRPD mg/L 0.3% <_30.4 <br /> Nitrate+Nitrite as N 4500NO3F 05/29/2026:206001MM1 Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 97.0% 80-120 <br /> MS mg/L 5.609 95.0% 66-125 <br /> (VI2643782-001) MSD mg/L 5.609 95.4% 66-125 <br /> MSRPD mg/L 0.3% :530.4 <br /> Nitrate Nitrogen 4500NO3F 05/29/2026:206001MM1 Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 97.0% 80-120 <br /> MS mg/L 5.609 95.0% 66-125 <br /> (VI2643782-001) MSD mg/L 5.609 95.4% 66-125 <br /> MSRPD mg/L 0.3% :530.4 <br /> Nitrite as Nitrogen 4500NO3F 05/29/2026:206030MM1 Blank mg/L ND <0.2 <br /> LCS mg/L 1.218 101% 80-120 <br /> Page 7 of 8 Page 7 of 8 <br />