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March 30, 2023 Lab No. : STK2331644 San Joaquin County EHD Customer No. : 3017919 Quality Control -Wet Chem Wet Chem Alkalinity(as CaCO3) 2320B 02/12/2023:201378AMM ND mg/L 0.04% 10 Bicarbonate 2320B (VI 2340701-001) Dup mg/L 0% 10 E.C. 2320B (VI 2340701-001) Dup umhos/cm 0.4% 5 Solids,Total Dissolved 2540CE 02/08/2023:201380CTL Blank mg/L ND <20 LCS mg/L 990.8 100% 90-110 (SP 2301754-002) Dup mg/L 4.0% 5 (SP 2301754-002) Dup mg/L 4.0% 5 Chloride 300.0 03/21/2023:203122LDM Blank mg/L ND <1 LCS mg/L 25.00 106% 90-110 MS mg/L 50.00 95.9% 85-121 (VI 2341613-001) MSD mg/L 50.00 92.5% 85-121 MSRPD mg/L 10.00 1.8% 5519 MS mg/L 50.00 93.0% 85-121 (VI 2341613-002) MSD mg/L 50.00 90.5% 85-121 MSRPD mg/L 10.00 1.4% 5519 Fluoride 300.0 03/21/2023:203122LDM Blank mg/L ND <0.1 LCS mg/L 2.500 109% 90-110 MS mg/L 5.000 113% 87-120 (VI 2341613-001) MSD mg/L 5.000 109% 87-120 MSRPD mg/L 10.00 3.6% 5_16 MS mg/L 5.000 109% 87-120 (VI 2341613-002) MSD mg/L 5.000 106% 87-120 MSRPD mg/L 10.00 2.8% .516 Nitrate 300.0 03/21/2023:203122LDM Blank mg/L ND <0.4 LCS mg/L 20.00 106% 90-110 MS mg/L 40.00 109% 85-119 (VI 2341613-001) MSD mg/L 40.00 105% 85-119 MSRPD mg/L 10.00 3.1% :519 MS mg/L 40.00 107% 85-119 (VI 2341613-002) MSD mg/L 40.00 104% 85-119 MSRPD mg/L 10.00 2.5% 5519 Nitrate Nitrogen 300.0 03/21/2023:203122LDM Blank mg/L ND <0.4 LCS mg/L 20.00 106% 90-110 MS mg/L 40.00 109% 85-119 (VI 2341613-001) MSD mg/L 40.00 105% 85-119 MSRPD mg/L 10.00 3.1% :519 MS mg/L 40.00 107% 85-119 (VI 2341613-002) MSD mg/L 40.00 104% 85-119 MSRPD mg/L 10.00 2.5% :519 Nitrite as Nitrogen 300.0 03/21/2023:203122LDM Blank mg/L ND <0.4 LCS mg/L 15.00 106% 90-110 MS mg/L 30.00 110% 74-126 (VI 2341613-001) MSD mg/L 30.00 106% 74-126 MSRPD mg/L 10.00 3.4% :520 MS mg/L 30.00 107% 74-126 (VI 2341613-002) MSD mg/L 30.00 104% 74-126 MSRPD mg/L 10.00 2.8% :520 Sulfate 300.0 03/21/2023:203122LDM Blank mg/L ND <0.5 LCS mg/L 50.00 106% 90-110 MS mg/L 100.0 103% 82-124 Page 8 of 9 Page 8 of 9