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July 25, 2024 Lab No. : STK2450653 San Joaquin County EHD Customer No. : 3017919 Quality Control -Wet Chem Wet Chem Alkalinity(as CaCO3) 2320B (STK2450602-004) Dup mg/L 0.5% 10 Bicarbonate 2320B (STK2450602-004) Dup mg/L 0.6% 10 Carbonate 2320B (STK2450602-004) Dup mg/L 0% 10 E.C. 2320B (STK2450602-004) Dup umhos/cm 0.5% 5 Hydroxide 2320B (STK2450602-004) Dup mg/L 0% 10 Solids,Total Dissolved 2540CE 07/23/2024:208122CTL Blank mg/L ND <20 LCS mg/L 990.5 99.8% 90-110 (STK2450601-001) Dup mg/L 1.46% 5 (STK2450601-001) Dup mg/L 0.4% 5 Chloride 300.0 07/19/2024:208024LDM Blank mg/L ND <1 LCS mg/L 25.00 103% 90-110 MS mg/L 50.00 100% 67-117 (STK2450655-001) MSD mg/L 50.00 100% 67-117 MSRPD mg/L 0.2% :57 MS mg/L 50.00 102% 67-117 (STK2450653-001) MSD mg/L 50.00 102% 67-117 MSRPD mg/L 0.4% :57 Fluoride 300.0 07/19/2024:208024LDM Blank mg/L ND <0.1 LCS mg/L 2.500 96.4% 90-110 MS mg/L 5.000 101% 89-111 (STK2450655-001) MSD mg/L 5.000 100% 89-111 MSRPD mg/L 0.8% :59 MS mg/L 5.000 101% 89-111 (STK2450653-001) MSD mg/L 5.000 102% 89-111 MSRPD mg/L 1.0% :59 Nitrate 300.0 07/19/2024:208024LDM Blank mg/L ND <0.4 LCS mg/L 20.00 103% 90-110 MS mg/L 40.00 101% 86-112 (STK2450655-001) MSD mg/L 40.00 101% 86-112 MSRPD mg/L 0.4% :57 MS mg/L 40.00 103% 86-112 (STK2450653-001) MSD mg/L 40.00 103% 86-112 MSRPD mg/L 0.1% :57 Nitrate+Nitrite as N 300.0 07/19/2024:208024LDM Blank mg/L ND <0.4 LCS mg/L 20.00 103% 90-110 MS mg/L 40.00 101% 86-112 (STK2450655-001) MSD mg/L 40.00 101% 86-112 MSRPD mg/L 0.4% <_7 MS mg/L 40.00 103% 86-112 (STK2450653-001) MSD mg/L 40.00 103% 86-112 MSRPD mg/L 0.1% :57 Nitrate Nitrogen 300.0 07/19/2024:208024LDM Blank mg/L ND <0.1 LCS mg/L 4.518 103% 90-110 MS mg/L 9.036 101% 86-112 (STK2450655-001) MSD mg/L 9.036 101% 86-112 MSRPD mg/L 0.5% :57 MS mg/L 9.036 103% 86-112 (STK2450653-001) MSD mg/L 9.036 103% 86-112 MSRPD mg/L 0.1% :57 Nitrite as Nitrogen 300.0 07/19/2024:208024LDM Blank mg/L ND <0.1 Page 6 of 7 Page 6 of 7