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March 27, 2026 <br /> San Joaquin County EHD Lab No. : STK2633435 <br /> Customer No. : 3017919 <br /> Quality Control -Wet Chem <br /> Wet Chem <br /> Alkalinity(as CaCO3) 2320B (SP 2604649-002) Dup mg/L 0.3% 10 <br /> Bicarbonate 2320B (SP 2604649-002) Dup mg/L 0.2% 10 <br /> Carbonate 2320B (SP 2604649-002) Dup mg/L 0% 10 <br /> E.C. 2320B (SP 2604649-002) Dup umhos/cm 0.1% 5 <br /> Hydroxide 2320B (SP 2604649-002) Dup mg/L 0% 10 <br /> Solids,Total Dissolved 2540CE 03/16/2026:202767CTL Blank mg/L ND <20 <br /> LCS mg/L 990.5 99.7% 90-110 <br /> (SP 2604245-001) Dup mg/L 2.49% 5 <br /> (SP 2604245-001) Dup mg/L 2.10% 5 <br /> Chloride 300.0 03/23/2026:203082LDM Blank mg/L ND <1 <br /> LCS mg/L 25.00 103% 90-110 <br /> MS mg/L 50.00 93.5% 67-117 <br /> (VI 2641828-002) MSD mg/L 50.00 93.5% 67-117 <br /> MSRPD mg/L 0.0% :57 <br /> MS mg/L 50.00 98.6% 67-117 <br /> (VI 2641827-001) MSD mg/L 50.00 98.5% 67-117 <br /> MSRPD mg/L 0.1% 157 <br /> Fluoride 300.0 03/23/2026:203082LDM Blank mg/L ND <0.1 <br /> LCS mg/L 2.500 102% 90-110 <br /> MS mg/L 5.000 102% 89-111 <br /> (VI 2641828-002) MSD mg/L 5.000 102% 89-111 <br /> MSRPD mg/L 0.2% 59 <br /> MS mg/L 5.000 99.6% 89-111 <br /> (VI 2641827-001) MSD mg/L 5.000 99.6% 89-111 <br /> MSRPD mg/L 0.0% 59 <br /> Sulfate 300.0 03/23/2026:203082LDM Blank mg/L ND <0.5 <br /> LCS mg/L 50.00 104% 90-110 <br /> MS mg/L 100.0 91.9% 18-165 <br /> (VI 2641828-002) MSD mg/L 100.0 92.0% 18-165 <br /> MSRPD mg/L 0.0% :57 <br /> MS mg/L 100.0 99.5% 18-165 <br /> (VI 2641827-001) MSD mg/L 100.0 99.4% 18-165 <br /> MSRPD mg/L 0.1% :_7 <br /> Nitrate 450ONO3F 03/12/2026:202644MM1 Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 93.8% 80-120 <br /> MS mg/L 5.609 90.4% 66-125 <br /> (VI 2641655-002) MSD mg/L 5.609 90.7% 66-125 <br /> MSRPD mg/L 0.2% :530.4 <br /> Nitrate+Nitrite as N 450ONO3F 03/12/2026:202644MM1 Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 93.8% 80-120 <br /> MS mg/L 5.609 90.4% 66-125 <br /> (VI 2641655-002) MSD mg/L 5.609 90.7% 66-125 <br /> MSRPD mg/L 0.2% :530.4 <br /> Nitrate Nitrogen 450ONO3F 03/12/2026:202644MM1 Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 93.8% 80-120 <br /> MS mg/L 5.609 90.4% 66-125 <br /> (VI 2641655-002) MSD mg/L 5.609 90.7% 66-125 <br /> MSRPD mg/L 0.2% :530.4 <br /> Nitrite as Nitrogen 450ONO3F 03/12/2026:202675MM1 Blank mg/L ND <0.2 <br /> LCS mg/L 1.218 103% 80-120 <br /> Page 7 of 8 Page 7 of 8 <br />