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May 6, 2024 Lab No. : STK2435740 San Joaquin County EHD Customer No. : 3017919 Quality Control -Wet Chem Wet Chem Alkalinity(as CaCO3) 2320B (VI 2443450-001) Dup mg/L 4.24% 10 Bicarbonate 2320B (VI 2443450-001) Dup mg/L 4.21% 10 Carbonate 2320B (VI 2443450-001) Dup mg/L 0% 10 E.C. 2320B (VI 2443450-001) Dup umhos/cm 0% 5 Hydroxide 2320B (VI 2443450-001) Dup mg/L 0% 10 Solids,Total Dissolved 2540CE 04/26/2024:204657CTL Blank mg/L ND <20 LCS mg/L 992.0 97.9% 90-110 (SP 2406298-001) Dup mg/L 0.8% 5 (SP 2406298-001) Dup mg/L 1.42% 5 Chloride 300.0 04/25/2024:204618LDM Blank mg/L ND <1 LCS mg/L 25.00 97.6% 90-110 MS mg/L 50.00 95.0% 67-117 (CH 2473197-005) MSD mg/L 50.00 95.3% 67-117 MSRPD mg/L 0.2% <_7 MS mg/L 50.00 101% 67-117 (CH 2473197-002) MSD mg/L 50.00 101% 67-117 MSRPD mg/L 0.1% :57 Fluoride 300.0 04/25/2024:204618LDM Blank mg/L ND <0.1 LCS mg/L 2.500 94.6% 90-110 MS mg/L 5.000 99.6% 89-111 (CH 2473197-005) MSD mg/L 5.000 98.0% 89-111 MSRPD mg/L 1.6% :59 MS mg/L 5.000 101% 89-111 (CH 2473197-002) MSD mg/L 5.000 101% 89-111 MSRPD mg/L 0.3% :59 Nitrate 300.0 04/25/2024:204618LDM Blank mg/L ND <0.4 LCS mg/L 20.00 97.8% 90-110 MS mg/L 40.00 101% 86-112 (CH 2473197-005) MSD mg/L 40.00 101% 86-112 MSRPD mg/L 0.1% 157 MS mg/L 40.00 103% 86-112 (CH 2473197-002) MSD mg/L 40.00 102% 86-112 MSRPD mg/L 0.2% <_7 Nitrate+Nitrite as N 300.0 04/25/2024:204618LDM Blank mg/L ND <0.4 LCS mg/L 20.00 97.8% 90-110 MS mg/L 40.00 101% 86-112 (CH 2473197-005) MSD mg/L 40.00 101% 86-112 MSRPD mg/L 0.1% 157 MS mg/L 40.00 103% 86-112 (CH 2473197-002) MSD mg/L 40.00 102% 86-112 MSRPD mg/L 0.2% :57 Nitrate Nitrogen 300.0 04/25/2024:204618LDM Blank mg/L ND <0.1 LCS mg/L 4.518 97.8% 90-110 MS mg/L 9.036 101% 86-112 (CH 2473197-005) MSD mg/L 9.036 101% 86-112 MSRPD mg/L 0.1% :57 MS mg/L 9.036 103% 86-112 (CH 2473197-002) MSD mg/L 9.036 102% 86-112 MSRPD mg/L 0.2% 157 Nitrite as Nitrogen 300.0 04/25/2024:204618LDM Blank mg/L ND <0.1 Page 6 of 7 Page 6 of 7