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October 30, 2025 Lab No. : STK2555937 San Joaquin County EHD Customer No. : 3017919 Quality Control - Wet Chem Wet Chem Alkalinity(as CaCO3) 2320B (VI 2547378-001) Dup mg/L 0.5% 10 Bicarbonate 2320B (VI 2547378-001) Dup mg/L 0% 10 Carbonate 2320B (VI 2547378-001) Dup mg/L 2.20% 10 E.C. 2320B (VI 2547378-001) Dup umhos/cm 0% 5 Hydroxide 2320B (VI 2547378-001) Dup mg/L 1% 10 Solids,Total Dissolved 2540CE 10/16/2025:211556CTL Blank mg/L ND <20 LCS mg/L 991.1 100% 90-110 (VI2547359-001) Dup mg/L 0.2% 5 (VI2547359-001) Dup mg/L 0.7% 5 Chloride 300.0 10/20/2025:211693LDM Blank mg/L ND <1 LCS mg/L 25.00 101% 90-110 MS mg/L 50.00 101% 67-117 (VI2547302-001) MSD mg/L 50.00 102% 67-117 MSRPD mg/L 0.3% <_7 MS mg/L 50.00 101% 67-117 (VI 2547275-001) MSD mg/L 50.00 101% 67-117 MSRPD mg/L 0.1% :57 Fluoride 300.0 10/20/2025:211693LDM Blank mg/L ND <0.1 LCS mg/L 2.500 98.4% 90-110 MS mg/L 5.000 102% 89-111 (VI2547302-001) MSD mg/L 5.000 103% 89-111 MSRPD mg/L 0.4% :59 MS mg/L 5.000 102% 89-111 (VI 2547275-001) MSD mg/L 5.000 102% 89-111 MSRPD mg/L 0.3% :59 Sulfate 300.0 10/20/2025:211693LDM Blank mg/L ND <0.5 LCS mg/L 50.00 101% 90-110 MS mg/L 100.0 101% 18-165 (VI2547302-001) MSD mg/L 100.0 101% 18-165 MSRPD mg/L 0.3% _<7 MS mg/L 100.0 102% 18-165 (VI 2547275-001) MSD mg/L 100.0 102% 18-165 MSRPD mg/L 0.1% 57 Nitrate 450ONO3F 10/15/2025:211502MM1 Blank mg/L ND <0.4 LCS mg/L 11.22 96.5% 80-120 MS mg/L 5.609 94.3% 66-125 (STK2555795-002) MSD mg/L 5.609 104% 66-125 MSRPD mg/L 4.3% <_30.4 Nitrate+Nitrite as N 450ONO3F 10/15/2025:211502MM1 Blank mg/L ND <0.4 LCS mg/L 11.22 96.5% 80-120 MS mg/L 5.609 94.3% 66-125 (STK2555795-002) MSD mg/L 5.609 104% 66-125 MSRPD mg/L 4.3% :530.4 Nitrate Nitrogen 450ONO3F 10/15/2025:211502MM1 Blank mg/L ND <0.4 LCS mg/L 11.22 96.5% 80-120 MS mg/L 5.609 94.3% 66-125 (STK2555795-002) MSD mg/L 5.609 104% 66-125 MSRPD mg/L 4.3% :530.4 Nitrite as Nitrogen 450ONO3F 10/15/2025:211530MM1 Blank mg/L ND <0.2 LCS mg/L 1.218 104% 80-120 Page 7 of 8 Page 7 of 8