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May 15, 2026 <br /> Lab No. : STK2636375 <br /> San Joaquin County EHD <br /> Customer No. : 3017919 <br /> Quality Control -Wet Chem <br /> Wet Chem <br /> Alkalinity(as CaCO3) 2320B (STK2636433-002) Dup mg/L 0.1% 10 <br /> Bicarbonate 2320B (STK2636433-002) Dup mg/L 0.4% 10 <br /> Carbonate 2320B (STK2636433-002) Dup mg/L 7.69% 10 <br /> E.C. 2320B (STK2636433-002) Dup umhos/cm 0.4% 5 <br /> Hydroxide 2320B (STK2636433-002) Dup mg/L 0% 10 <br /> Solids,Total Dissolved 2540CE 05/07/2026:205022CTL Blank mg/L ND <20 <br /> LCS mg/L 990.5 101% 90-110 <br /> (SP 2608816-001) Dup mg/L 1.26% 5 <br /> (SP 2608816-001) Dup mg/L 2.01% 5 <br /> Chloride 300.0 05/11/2026:205171LDM Blank mg/L ND <1 <br /> LCS mg/L 25.00 102% 90-110 <br /> MS mg/L 50.00 104% 67-117 <br /> (STK2636373-001) MSD mg/L 50.00 103% 67-117 <br /> MSRPD mg/L 0.1% _<7 <br /> MS mg/L 50.00 79.1% 67-117 <br /> (CC 2681489-003) MSD mg/L 50.00 77.6% 67-117 <br /> MSRPD mg/L 0.7% :_7 <br /> Fluoride 300.0 05/11/2026:205171LDM Blank mg/L ND <0.1 <br /> LCS mg/L 2.500 102% 90-110 <br /> MS mg/L 5.000 106% 89-111 <br /> (STK2636373-001) MSD mg/L 5.000 106% 89-111 <br /> MSRPD mg/L 0.1% <_9 <br /> MS mg/L 5.000 103% 89-111 <br /> (CC 2681489-003) MSD mg/L 5.000 104% 89-111 <br /> MSRPD mg/L 0.2% :59 <br /> Sulfate 300.0 05/11/2026:205171LDM Blank mg/L ND <0.5 <br /> LCS mg/L 50.00 103% 90-110 <br /> MS mg/L 100.0 105% 18-165 <br /> (STK2636373-001) MSD mg/L 100.0 105% 18-165 <br /> MSRPD mg/L 0.2% <7 <br /> MS mg/L 100.0 72.3% 18-165 <br /> (CC 2681489-003) MSD mg/L 100.0 70.2% 18-165 <br /> MSRPD mg/L 0.8% 57 <br /> Nitrate 450ONO3F 05/06/2026:204967MM1 Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 97.4% 80-120 <br /> MS mg/L 5.609 96.6% 66-125 <br /> (SP 2608756-006) MSD mg/L 5.609 95.7% 66-125 <br /> MSRPD mg/L 0.7% :_30.4 <br /> Nitrate+Nitrite as N 450ONO3F 05/06/2026:204967MM1 Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 97.4% 80-120 <br /> MS mg/L 5.609 96.6% 66-125 <br /> (SP 2608756-006) MSD mg/L 5.609 95.7% 66-125 <br /> MSRPD mg/L 0.7% 530.4 <br /> Nitrate Nitrogen 450ONO3F 05/06/2026:204967MM1 Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 97.4% 80-120 <br /> MS mg/L 5.609 96.6% 66-125 <br /> (SP 2608756-006) MSD mg/L 5.609 95.7% 66-125 <br /> MSRPD mg/L 0.7% :530.4 <br /> Nitrite as Nitrogen 450ONO3F 05/06/2026:205000MM1 Blank mg/L ND <0.2 <br /> LCS mg/L 1.218 104% 80-120 <br /> Page 7 of 8 Page 7 of 8 <br />