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December 18, 2023 Lab No. : STK2356366 San Joaquin County EHD Customer No. : 3017919 Quality Control -Wet Chem Wet Chem Alkalinity(as CaCO3) 2320B 12/03/2023:213630AMM ND mg/L 1.01% 10 406 Bicarbonate 2320B (SP 2319811-006) Dup mg/L 1% 10 E.C. 2320B (SP 2319811-006) Dup umhos/cm 0.06% 5 Solids,Total Dissolved 2540CE 12/01/2023:213585CTL Blank mg/L ND <20 LCS mg/L 991.5 106% 90-110 (SP 2319709-003) Dup mg/L 2.47% 5 (SP 2319709-003) Dup mg/L 5.68% 5 440 Chloride 300.0 11/30/2023:213563LDM Blank mg/L ND <1 LCS mg/L 25.00 100% 90-110 MS mg/L 50.00 100% 67-117 (SP 2319777-001) MSD mg/L 50.00 100% 67-117 MSRPD mg/L 0.2% <_7 MS mg/L 50.00 99.3% 67-117 (CH 2370705-001) MSD mg/L 50.00 98.9% 67-117 MSRPD mg/L 0.4% :57 Fluoride 300.0 11/30/2023:213563LDM Blank mg/L ND <0.1 LCS mg/L 2.500 100% 90-110 MS mg/L 5.000 102% 89-111 (SP 2319777-001) MSD mg/L 5.000 102% 89-111 MSRPD mg/L 0.3% :59 MS mg/L 5.000 103% 89-111 (CH 2370705-001) MSD mg/L 5.000 103% 89-111 MSRPD mg/L 0.3% :59 Nitrate 300.0 11/30/2023:213563LDM Blank mg/L ND <0.4 LCS mg/L 20.00 99.4% 90-110 MS mg/L 40.00 101% 86-112 (SP 2319777-001) MSD mg/L 40.00 101% 86-112 MSRPD mg/L 0.2% :57 MS mg/L 40.00 99.7% 86-112 (CH 2370705-001) MSD mg/L 40.00 98.8% 86-112 MSRPD mg/L 0.7% <_7 Nitrate+Nitrite as N 300.0 11/30/2023:213563LDM Blank mg/L ND <0.4 LCS mg/L 20.00 99.4% 90-110 MS mg/L 40.00 101% 86-112 (SP 2319777-001) MSD mg/L 40.00 101% 86-112 MSRPD mg/L 0.2% :57 MS mg/L 40.00 99.7% 86-112 (CH 2370705-001) MSD mg/L 40.00 98.8% 86-112 MSRPD mg/L 0.7% :57 Nitrate Nitrogen 300.0 11/30/2023:213563LDM Blank mg/L ND <0.4 LCS mg/L 20.00 99.4% 90-110 MS mg/L 40.00 101% 86-112 (SP 2319777-001) MSD mg/L 40.00 101% 86-112 MSRPD mg/L 0.2% <_7 MS mg/L 40.00 99.7% 86-112 (CH 2370705-001) MSD mg/L 40.00 98.8% 86-112 MSRPD mg/L 0.7% :57 Nitrite as Nitrogen 300.0 11/30/2023:213563LDM Blank mg/L ND <0.4 LCS mg/L 15.00 102% 90-110 MS mg/L 30.00 103% 88-111 Page 7 of 8 Page 7 of 8