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December 17, 2025 <br /> San Joaquin County EHD Lab No. : STK2558283 <br /> Customer No. : 3017919 <br /> Quality Control -Wet Chem <br /> M <br /> Wet Chem <br /> Alkalinity(as CaCO3) 2320B (VI 2548464-002) Dup mg/L 0.9% 10 <br /> Bicarbonate 2320B (VI 2548464-002) Dup mg/L 0.9% 10 <br /> Carbonate 2320B (VI 2548464-002) Dup mg/L 0% 10 <br /> E.C. 2320B (VI 2548464-002) Dup umhos/cm 0.3% 5 <br /> Hydroxide 2320B (VI 2548464-002) Dup mg/L 0% 10 <br /> Solids,Total Dissolved 2540CE 12/04/2025:213561CTL Blank mg/L ND <20 <br /> LCS mg/L 991.1 98.2% 90-110 <br /> (SP 2520599-001) Dup mg/L 2.96% 5 <br /> (SP 2520599-001) Dup mg/L 0.6% 5 <br /> Chloride 300.0 12/11/2025:213859LDM Blank mg/L ND <1 <br /> LCS mg/L 25.00 108% 90-110 <br /> MS mg/L 50.00 99.7% 67-117 <br /> (CH 2591844-003) MSD mg/L 50.00 100% 67-117 <br /> MSRPD mg/L 0.3% _<7 <br /> MS mg/L 50.00 90.0% 67-117 <br /> (VI2548561-015) MSD mg/L 50.00 90.4% 67-117 <br /> MSRPD mg/L 0.2% 157 <br /> Fluoride 300.0 12/11/2025:213859LDM Blank mg/L ND <0.1 <br /> LCS mg/L 2.500 106% 90-110 <br /> MS mg/L 5.000 101% 89-111 <br /> (CH 2591844-003) MSD mg/L 5.000 102% 89-111 <br /> MSRPD mg/L 0.2% :59 <br /> MS mg/L 5.000 102% 89-111 <br /> (VI2548561-015) MSD mg/L 5.000 102% 89-111 <br /> MSRPD mg/L 0.3% :59 <br /> Sulfate 300.0 12/11/2025:213859LDM Blank mg/L ND <0.5 <br /> LCS mg/L 50.00 108% 90-110 <br /> MS mg/L 100.0 101% 18-165 <br /> (CH 2591844-003) MSD mg/L 100.0 101% 18-165 <br /> MSRPD mg/L 0.3% 157 <br /> MS mg/L 100.0 92.6% 18-165 <br /> (VI2548561-015) MSD mg/L 100.0 92.9% 18-165 <br /> MSRPD mg/L 0.2% :57 <br /> Nitrate 4500NO3F 12103/2025:213515MMI Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 102% 80-120 <br /> MS mg/L 5.609 96.5% 66-125 <br /> (VI2548466-001) MSD mg/L 5.609 96.8% 66-125 <br /> MSRPD mg/L 0.3% 1530.4 <br /> Nitrate+Nitrite as N 4500NO3F 12/03/2025:213515MMI Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 102% 80-120 <br /> MS mg/L 5.609 96.5% 66-125 <br /> (VI2548466-001) MSD mg/L 5.609 96.8% 66-125 <br /> MSRPD mg/L 0.3% :530.4 <br /> Nitrate Nitrogen 4500NO3F 12/03/2025:213515MM1 Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 102% 80-120 <br /> MS mg/L 5.609 96.5% 66-125 <br /> (VI2548466-001) MSD mg/L 5.609 96.8% 66-125 <br /> MSRPD mg/L 0.3% 1530.4 <br /> Nitrite as Nitrogen 4500NO3F 12/03/2025:213531MM1 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 />