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July 16, 2026 <br /> San Joaquin County EHD Lab No. : STK2639741 <br /> Customer No. : 3017919 <br /> Quality Control -Wet Chem <br /> Wet Chem <br /> Alkalinity(as CaCO3) 2320B (SP 2613006-006) Dup mg/L 0.06% 10 <br /> Bicarbonate 2320B (SP 2613006-006) Dup mg/L 0% 10 <br /> Carbonate 2320B (SP 2613006-006) Dup mg/L 0% 10 <br /> E.C. 2320B (SP 2613006-006) Dup umhos/cm 0.1% 5 <br /> Hydroxide 2320B (SP 2613006-006) Dup mg/L 0% 10 <br /> Solids,Total Dissolved 2540CE 07/06/2026:207603CTL Blank mg/L ND <20 <br /> LCS mg/L 990.5 101% 90-110 <br /> (SP 2613049-001) Dup mg/L 0.9% 5 <br /> (SP 2613049-001) Dup mg/L 1.52% 5 <br /> Chloride 300.0 07/08/2026:207721LDM Blank mg/L ND <1 <br /> LCS mg/L 25.00 98.6% 90-110 <br /> MS mg/L 50.00 102% 67-117 <br /> (STK2639741-001) MSD mg/L 50.00 102% 67-117 <br /> MSRPD mg/L 0.0% :57 <br /> MS mg/L 50.00 99.2% 67-117 <br /> (STK2639742-001) MSD mg/L 50.00 99.1% 67-117 <br /> MSRPD mg/L 0.1% <_7 <br /> Fluoride 300.0 07/08/2026:207721LDM Blank mg/L ND <0.1 <br /> LCS mg/L 2.500 97.4% 90-110 <br /> MS mg/L 5.000 105% 89-111 <br /> (STK2639741-001) MSD mg/L 5.000 106% 89-111 <br /> MSRPD mg/L 0.2% 59 <br /> MS mg/L 5.000 105% 89-111 <br /> (STK2639742-001) MSD mg/L 5.000 104% 89-111 <br /> MSRPD mg/L 0.2% :59 <br /> Sulfate 300.0 07/08/2026:207721LDM Blank mg/L ND <0.5 <br /> LCS mg/L 50.00 99.5% 90-110 <br /> MS mg/L 100.0 105% 18-165 <br /> (STK2639741-001) MSD mg/L 100.0 105% 18-165 <br /> MSRPD mg/L 0.0% 157 <br /> MS mg/L 100.0 102% 18-165 <br /> (STK2639742-001) MSD mg/L 100.0 102% 18-165 <br /> MSRPD mg/L 0.0% 57 <br /> Nitrate 4500NO3F 07/02/2026:207485MM1 Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 94.8% 80-120 <br /> MS mg/L 5.609 91.8% 66-125 <br /> (SP 2612931-003) MSD mg/L 5.609 92.7% 66-125 <br /> MSRPD mg/L 0.7% 1530.4 <br /> Nitrate+Nitrite as N 4500NO3F 07/02/2026:207485MM1 Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 94.8% 80-120 <br /> MS mg/L 5.609 91.8% 66-125 <br /> (SP 2612931-003) MSD mg/L 5.609 92.7% 66-125 <br /> MSRPD mg/L 0.7% :530.4 <br /> Nitrate Nitrogen 4500NO3F 07/02/2026:207485MM1 Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 94.8% 80-120 <br /> MS mg/L 5.609 91.8% 66-125 <br /> (SP 2612931-003) MSD mg/L 5.609 92.7% 66-125 <br /> MSRPD mg/L 0.7% :530.4 <br /> Nitrite as Nitrogen 4500NO3F 07/02/2026:207527MM1 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 />