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June 9, 2026 <br /> San Joaquin County EHD Lab No. : STK2637324 <br /> Customer No. : 3017919 <br /> Quality Control -Wet Chem <br /> Wet Chem <br /> Alkalinity(as CaCO3) 2320B (VI 2643558-007) Dup mg/L 0.1% 10 <br /> Bicarbonate 2320B (VI 2643558-007) Dup mg/L 0.1% 10 <br /> Carbonate 2320B (VI 2643558-007) Dup mg/L 0% 10 <br /> E.C. 2320B (VI 2643558-007) Dup umhos/cm 0.2% 5 <br /> Hydroxide 2320B (VI 2643558-007) Dup mg/L 0% 10 <br /> Solids,Total Dissolved 2540CE 05/22/2026:205715CTL Blank mg/L ND <20 <br /> LCS mg/L 990.5 98.5% 90-110 <br /> (VI 2643547-001) Dup mg/L 1.82% 5 <br /> (VI 2643547-001) Dup mg/L 3.72% 5 <br /> Chloride 300.0 05/28/2026:205954LDM Blank mg/L ND <1 <br /> LCS mg/L 25.00 94.5% 90-110 <br /> MS mg/L 50.00 100% 67-117 <br /> (STK2637088-001) MSD mg/L 50.00 100% 67-117 <br /> MSRPD mg/L 0.1% :57 <br /> MS mg/L 50.00 69.7% 67-117 <br /> (SP 2610211-001) MSD mg/L 50.00 71.8% 67-117 <br /> MSRPD mg/L 0.9% :57 <br /> Fluoride 300.0 05/28/2026:205954LDM Blank mg/L ND <0.1 <br /> LCS mg/L 2.500 92.7% 90-110 <br /> MS mg/L 5.000 103% 89-111 <br /> (STK2637088-001) MSD mg/L 5.000 103% 89-111 <br /> MSRPD mg/L 0.1% 159 <br /> MS mg/L 5.000 101% 89-111 <br /> (SP 2610211-001) MSD mg/L 5.000 101% 89-111 <br /> MSRPD mg/L 0.1% s9 <br /> Sulfate 300.0 05/28/2026:205954LDM Blank mg/L ND <0.5 <br /> LCS mg/L 50.00 94.5% 90-110 <br /> MS mg/L 100.0 100% 18-165 <br /> (STK2637088-001) MSD mg/L 100.0 100% 18-165 <br /> MSRPD mg/L 0.1% <_7 <br /> MS mg/L 100.0 90.4% 18-165 <br /> (SP 2610211-001) MSD mg/L 100.0 90.7% 18-165 <br /> MSRPD mg/L 0.2% <_7 <br /> Nitrate 4500NO3F 05/20/2026:205597MM1 Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 93.2% 80-120 <br /> MS mg/L 5.609 93.8% 66-125 <br /> (VI 2643507-001) MSD mg/L 5.609 92.0% 66-125 <br /> MSRPD mg/L 1.1% :530.4 <br /> Nitrate+Nitrite as N 4500NO3F 05/20/2026:205597MM1 Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 93.2% 80-120 <br /> MS mg/L 5.609 93.8% 66-125 <br /> (VI 2643507-001) MSD mg/L 5.609 92.0% 66-125 <br /> MSRPD mg/L 1.1% :530.4 <br /> Nitrate Nitrogen 4500NO3F 05/20/2026:205597MM1 Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 93.2% 80-120 <br /> MS mg/L 5.609 93.8% 66-125 <br /> (VI 2643507-001) MSD mg/L 5.609 92.0% 66-125 <br /> MSRPD mg/L 1.1% :_30.4 <br /> Nitrite as Nitrogen 4500NO3F 05/20/2026:205623MM1 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 />