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June 11, 2024 Lab No. : STK2437123 San Joaquin County EHD Customer No. : 3017919 Quality Control -Wet Chem Wet Chem Alkalinity(as CaCO3) 2320B (STK2436960-004) Dup mg/L 1% 10 Bicarbonate 2320B (STK2436960-004) Dup mg/L 1% 10 Carbonate 2320B (STK2436960-004) Dup mg/L 0% 10 E.C. 2320B (STK2436960-004) Dup umhos/cm 0.1% 5 Hydroxide 2320B (STK2436960-004) Dup mg/L 0% 10 Solids,Total Dissolved 2540CE 05/20/2024:205622CTL Blank mg/L ND <20 LCS mg/L 992.0 99.1% 90-110 (VI 2443914-001) Dup mg/L 0.3% 5 (VI 2443914-001) Dup mg/L 0.5% 5 Chloride 300.0 05/17/2024:205556LDM Blank mg/L ND <1 LCS mg/L 25.00 105% 90-110 MS mg/L 50.00 101% 67-117 (STK2437123-001) MSD mg/L 50.00 102% 67-117 MSRPD mg/L 1.1% :57 MS mg/L 50.00 94.1% 67-117 (CH 2473940-001) MSD mg/L 50.00 94.3% 67-117 MSRPD mg/L 0.2% :57 Fluoride 300.0 05/17/2024:205556LDM Blank mg/L ND <0.1 LCS mg/L 2.500 99.5% 90-110 MS mg/L 5.000 103% 89-111 (STK2437123-001) MSD mg/L 5.000 104% 89-111 MSRPD mg/L 0.8% :59 MS mg/L 5.000 103% 89-111 (CH 2473940-001) MSD mg/L 5.000 103% 89-111 MSRPD mg/L 0.8% :59 Nitrate 300.0 05/17/2024:205556LDM Blank mg/L ND <0.4 LCS mg/L 20.00 104% 90-110 MS mg/L 40.00 103% 86-112 (STK2437123-001) MSD mg/L 40.00 104% 86-112 MSRPD mg/L 0.9% :57 MS mg/L 40.00 89.8% 86-112 (CH 2473940-001) MSD mg/L 40.00 89.6% 86-112 MSRPD mg/L 0.1% :57 Nitrate+Nitrite as N 300.0 05/17/2024:205556LDM Blank mg/L ND <0.4 LCS mg/L 20.00 104% 90-110 MS mg/L 40.00 103% 86-112 (STK2437123-001) MSD mg/L 40.00 104% 86-112 MSRPD mg/L 0.9% <_7 MS mg/L 40.00 89.8% 86-112 (CH 2473940-001) MSD mg/L 40.00 89.6% 86-112 MSRPD mg/L 0.1% :57 Nitrate Nitrogen 300.0 05/17/2024:205556LDM Blank mg/L ND <0.1 LCS mg/L 4.518 104% 90-110 MS mg/L 9.036 103% 86-112 (STK2437123-001) MSD mg/L 9.036 104% 86-112 MSRPD mg/L 0.9% :57 MS mg/L 9.036 89.7% 86-112 (CH 2473940-001) MSD mg/L 9.036 89.6% 86-112 MSRPD mg/L 0.1% :57 Nitrite as Nitrogen 300.0 05/17/2024:205556LDM Blank mg/L ND <0.1 Page 6 of 7 Page 6 of 7