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May 7, 2024 Lab No. : STK2436145 San Joaquin County EHD Customer No. : 3017919 Quality Control -Wet Chem Wet Chem Alkalinity(as CaCO3) 2320B (VI 2443396-001) Dup mg/L 0.9% 10 Bicarbonate 2320B (VI 2443396-001) Dup mg/L 1.19% 10 Carbonate 2320B (VI 2443396-001) Dup mg/L 0% 10 E.C. 2320B (VI 2443396-001) Dup umhos/cm 0% 5 Hydroxide 2320B (VI 2443396-001) Dup mg/L 0% 10 Solids,Total Dissolved 2540CE 05/03/2024:204906CTL Blank mg/L ND <20 LCS mg/L 992.0 97.6% 90-110 (CH 2473242-001) Dup mg/L 0.8% 5 (CH 2473242-001) Dup mg/L 1.02% 5 Chloride 300.0 05/02/2024:205017LDM Blank mg/L ND <1 LCS mg/L 25.00 97.1% 90-110 MS mg/L 50.00 93.9% 67-117 (CC 2481544-001) MSD mg/L 50.00 94.1% 67-117 MSRPD mg/L 0.1% <_7 MS mg/L 50.00 98.4% 67-117 (STK2435916-001) MSD mg/L 50.00 98.5% 67-117 MSRPD mg/L 0.1% :57 Fluoride 300.0 05/02/2024:205017LDM Blank mg/L ND <0.1 LCS mg/L 2.500 99.3% 90-110 MS mg/L 5.000 102% 89-111 (CC 2481544-001) MSD mg/L 5.000 102% 89-111 MSRPD mg/L 0.0% :59 MS mg/L 5.000 103% 89-111 (STK2435916-001) MSD mg/L 5.000 103% 89-111 MSRPD mg/L 0.0% :59 Nitrate 300.0 05/02/2024:205017LDM Blank mg/L ND <0.4 LCS mg/L 20.00 98.8% 90-110 MS mg/L 40.00 93.3% 86-112 (CC 2481544-001) MSD mg/L 40.00 93.7% 86-112 MSRPD mg/L 0.2% 157 MS mg/L 40.00 94.2% 86-112 (STK2435916-001) MSD mg/L 40.00 94.3% 86-112 MSRPD mg/L 0.1% <_7 Nitrate+Nitrite as N 300.0 05/02/2024:205017LDM Blank mg/L ND <0.4 LCS mg/L 20.00 98.8% 90-110 MS mg/L 40.00 93.3% 86-112 (CC 2481544-001) MSD mg/L 40.00 93.7% 86-112 MSRPD mg/L 0.2% 157 MS mg/L 40.00 94.2% 86-112 (STK2435916-001) MSD mg/L 40.00 94.3% 86-112 MSRPD mg/L 0.1% :57 Nitrate Nitrogen 300.0 05/02/2024:205017LDM Blank mg/L ND <0.1 LCS mg/L 4.518 98.8% 90-110 MS mg/L 9.036 93.3% 86-112 (CC 2481544-001) MSD mg/L 9.036 93.6% 86-112 MSRPD mg/L 0.2% :57 MS mg/L 9.036 94.2% 86-112 (STK2435916-001) MSD mg/L 9.036 94.2% 86-112 MSRPD mg/L 0.1% 157 Nitrite as Nitrogen 300.0 05/02/2024:205017LDM Blank mg/L ND <0.1 Page 7 of 8 Page 7 of 8