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July 18, 2024 Lab No. : STK2439929 San Joaquin County EHD Customer No. : 3017919 Quality Control -Wet Chem Wet Chem Alkalinity(as CaCO3) 2320B (STK2450152-002) Dup mg/L 1.19% 10 Bicarbonate 2320B (STK2450152-002) Dup mg/L 1.19% 10 Carbonate 2320B (STK2450152-002) Dup mg/L 0% 10 E.C. 2320B (STK2450152-002) Dup umhos/cm 0.8% 5 Hydroxide 2320B (STK2450152-002) Dup mg/L 0% 10 Solids,Total Dissolved 2540CE 07/09/2024:207575CTL Blank mg/L ND <20 LCS mg/L 990.5 98.9% 90-110 (STK2439898-001) Dup mg/L 2.31% 5 (STK2439898-001) Dup mg/L 2.18% 5 Chloride 300.0 07/09/2024:207640LDM Blank mg/L ND <1 LCS mg/L 25.00 104% 90-110 MS mg/L 50.00 68.1% 67-117 (SP 2410412-001) MSD mg/L 50.00 79.6% 67-117 MSRPD mg/L 4.3% :57 MS mg/L 50.00 100% 67-117 (SP 2411004-001) MSD mg/L 50.00 100% 67-117 MSRPD mg/L 0.1% <_7 Fluoride 300.0 07/09/2024:207640LDM Blank mg/L ND <0.1 LCS mg/L 2.500 102% 90-110 MS mg/L 5.000 103% 89-111 (SP 2410412-001) MSD mg/L 5.000 103% 89-111 MSRPD mg/L 0.1% :59 MS mg/L 5.000 105% 89-111 (SP 2411004-001) MSD mg/L 5.000 105% 89-111 MSRPD mg/L 0.1% :59 Nitrate 300.0 07/09/2024:207640LDM Blank mg/L ND <0.4 LCS mg/L 20.00 104% 90-110 MS mg/L 40.00 105% 86-112 (SP 2410412-001) MSD mg/L 40.00 105% 86-112 MSRPD mg/L 0.1% :57 MS mg/L 40.00 106% 86-112 (SP 2411004-001) MSD mg/L 40.00 106% 86-112 MSRPD mg/L 0.1% :57 Nitrate+Nitrite as N 300.0 07/09/2024:207640LDM Blank mg/L ND <0.4 LCS mg/L 20.00 104% 90-110 MS mg/L 40.00 105% 86-112 (SP 2410412-001) MSD mg/L 40.00 105% 86-112 MSRPD mg/L 0.1% :57 MS mg/L 40.00 106% 86-112 (SP 2411004-001) MSD mg/L 40.00 106% 86-112 MSRPD mg/L 0.1% :57 Nitrate Nitrogen 300.0 07/09/2024:207640LDM Blank mg/L ND <0.1 LCS mg/L 4.518 104% 90-110 MS mg/L 9.036 105% 86-112 (SP 2410412-001) MSD mg/L 9.036 105% 86-112 MSRPD mg/L 0.1% :57 MS mg/L 9.036 106% 86-112 (SP 2411004-001) MSD mg/L 9.036 106% 86-112 MSRPD mg/L 0.1% :57 Nitrite as Nitrogen 300.0 07/09/2024:207640LDM Blank mg/L ND <0.1 Page 6 of 7 Page 6 of 7