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July 2, 2024 Lab No. : STK2439113 San Joaquin County EHD Customer No. : 3017919 Quality Control -Wet Chem Wet Chem Alkalinity(as CaCO3) 2320B (SP 2410190-002) Dup mg/L 0.05% 10 Bicarbonate 2320B (SP 2410190-002) Dup mg/L 0% 10 Carbonate 2320B (SP 2410190-002) Dup mg/L 0% 10 E.C. 2320B (SP 2410190-002) Dup umhos/cm 0.09% 5 Hydroxide 2320B (SP 2410190-002) Dup mg/L 0% 10 Solids,Total Dissolved 2540CE 06/21/2024:206926CTL Blank mg/L ND <20 LCS mg/L 990.5 99.8% 90-110 (CH 2470279-006) Dup mg/L 1.80% 5 (CH 2470279-006) Dup mg/L 0.5% 5 Chloride 300.0 06/20/2024:207000LDM Blank mg/L ND <1 LCS mg/L 25.00 103% 90-110 MS mg/L 50.00 102% 67-117 (VI 2444774-004) MSD mg/L 50.00 102% 67-117 MSRPD mg/L 0.2% :57 MS mg/L 50.00 99.3% 67-117 (VI 2444723-005) MSD mg/L 50.00 99.4% 67-117 MSRPD mg/L 0.1% <_7 Fluoride 300.0 06/20/2024:207000LDM Blank mg/L ND <0.1 LCS mg/L 2.500 101% 90-110 MS mg/L 5.000 101% 89-111 (VI 2444774-004) MSD mg/L 5.000 101% 89-111 MSRPD mg/L 0.3% :59 MS mg/L 5.000 98.1% 89-111 (VI 2444723-005) MSD mg/L 5.000 98.3% 89-111 MSRPD mg/L 0.2% :59 Nitrate 300.0 06/20/2024:207000LDM Blank mg/L ND <0.4 LCS mg/L 20.00 103% 90-110 MS mg/L 40.00 103% 86-112 (VI 2444774-004) MSD mg/L 40.00 103% 86-112 MSRPD mg/L 0.2% :57 MS mg/L 40.00 100% 86-112 (VI 2444723-005) MSD mg/L 40.00 100% 86-112 MSRPD mg/L 0.1% :57 Nitrate+Nitrite as N 300.0 06/20/2024:207000LDM Blank mg/L ND <0.4 LCS mg/L 20.00 103% 90-110 MS mg/L 40.00 103% 86-112 (VI 2444774-004) MSD mg/L 40.00 103% 86-112 MSRPD mg/L 0.2% :57 MS mg/L 40.00 100% 86-112 (VI 2444723-005) MSD mg/L 40.00 100% 86-112 MSRPD mg/L 0.1% :57 Nitrate Nitrogen 300.0 06/20/2024:207000LDM Blank mg/L ND <0.1 LCS mg/L 4.518 103% 90-110 MS mg/L 9.036 103% 86-112 (VI 2444774-004) MSD mg/L 9.036 103% 86-112 MSRPD mg/L 0.2% :57 MS mg/L 9.036 100% 86-112 (VI 2444723-005) MSD mg/L 9.036 100% 86-112 MSRPD mg/L 0.1% :57 Nitrite as Nitrogen 300.0 06/20/2024:207000LDM Blank mg/L ND <0.1 Page 6 of 7 Page 6 of 7