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June 11, 2024 Lab No. : STK2437400 San Joaquin County EHD Customer No. : 3017919 Quality Control -Wet Chem Wet Chem Alkalinity(as CaCO3) 2320B (STK2437376-001) Dup mg/L 0.01% 10 Bicarbonate 2320B (STK2437376-001) Dup mg/L 0% 10 Carbonate 2320B (STK2437376-001) Dup mg/L 0% 10 E.C. 2320B (STK2437376-001) Dup umhos/cm 0.7% 5 Hydroxide 2320B (STK2437376-001) Dup mg/L 0% 10 Solids,Total Dissolved 2540CE 05/24/2024:205851CTL Blank mg/L ND <20 LCS mg/L 992.0 99.1% 90-110 (STK2437334-011) Dup mg/L 1.79% 5 (STK2437334-011) Dup mg/L 1% 5 Chloride 300.0 05/23/2024:205812LDM Blank mg/L ND <1 LCS mg/L 25.00 97.9% 90-110 MS mg/L 50.00 100% 67-117 (STK2437400-001) MSD mg/L 50.00 100% 67-117 MSRPD mg/L 0.1% :57 MS mg/L 50.00 97.7% 67-117 (STK2437393-001) MSD mg/L 50.00 99.9% 67-117 MSRPD mg/L 1.6% :57 Fluoride 300.0 05/23/2024:205812LDM Blank mg/L ND <0.1 LCS mg/L 2.500 98.2% 90-110 MS mg/L 5.000 104% 89-111 (STK2437400-001) MSD mg/L 5.000 103% 89-111 MSRPD mg/L 0.9% :59 MS mg/L 5.000 104% 89-111 (STK2437393-001) MSD mg/L 5.000 105% 89-111 MSRPD mg/L 1.3% :59 Nitrate 300.0 05/23/2024:205812LDM Blank mg/L ND <0.4 LCS mg/L 20.00 98.5% 90-110 MS mg/L 40.00 102% 86-112 (STK2437400-001) MSD mg/L 40.00 102% 86-112 MSRPD mg/L 0.1% :57 MS mg/L 40.00 105% 86-112 (STK2437393-001) MSD mg/L 40.00 107% 86-112 MSRPD mg/L 1.5% :57 Nitrate+Nitrite as N 300.0 05/23/2024:205812LDM Blank mg/L ND <0.4 LCS mg/L 20.00 98.5% 90-110 MS mg/L 40.00 102% 86-112 (STK2437400-001) MSD mg/L 40.00 102% 86-112 MSRPD mg/L 0.1% <_7 MS mg/L 40.00 105% 86-112 (STK2437393-001) MSD mg/L 40.00 107% 86-112 MSRPD mg/L 1.5% :57 Nitrate Nitrogen 300.0 05/23/2024:205812LDM Blank mg/L ND <0.1 LCS mg/L 4.518 98.4% 90-110 MS mg/L 9.036 102% 86-112 (STK2437400-001) MSD mg/L 9.036 102% 86-112 MSRPD mg/L 0.1% :57 MS mg/L 9.036 105% 86-112 (STK2437393-001) MSD mg/L 9.036 107% 86-112 MSRPD mg/L 1.5% :57 Nitrite as Nitrogen 300.0 05/23/2024:205812LDM Blank mg/L ND <0.1 Page 6 of 7 Page 6 of 7