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June 26, 2026 <br /> Lab No. : STK2638295 <br /> San Joaquin County EHD <br /> Customer No. : 3017919 <br /> Quality Control - Wet Chem <br /> Wet Chem <br /> Alkalinity(as CaCO3) 2320B (VI 2643991-012) Dup mg/L 0.7% 10 <br /> Bicarbonate 2320B (VI2643991-012) Dup mg/L 0.8% 10 <br /> Carbonate 2320B (VI2643991-012) Dup mg/L 0% 10 <br /> E.C. 2320B (VI 2643991-012) Dup umhos/cm 0.9% 5 <br /> Hydroxide .2320B (VI2643991-012) Dup mg/L 0% 10 <br /> Solids,Total Dissolved 2540CE 06/09/2026:20642OCTL Blank mg/L ND <20 <br /> LCS mg/L 990.5 102% 90-110 <br /> (SP 2611226-003) Dup mg/L 1.60% 5 <br /> (SP 2611226-003) Dup mg/L 0.8% 5 <br /> Chloride 300.0 06/24/2026:207151LDM Blank mg/L ND <1 <br /> LCS mg/L 25.00 103% 90-110 <br /> MS mg/L 50.00 98.5% 67-117 <br /> (VI2644303-003) MSD mg/L 50.00 98.5% 67-117 <br /> MSRPD mg/L 0.0% :57 <br /> MS mg/L 50.00 96.7% 67-117 <br /> (VI2644440-008) MSD mg/L 50.00 97.7% 67-117 <br /> MSRPD mg/L 0.7% .57 <br /> Fluoride 300.0 06/24/2026:207151LDM Blank mg/L ND <0.1 <br /> LCS mg/L 2.500 102% 90-110 <br /> MS mg/L 5.000 106% 89-111 <br /> (VI2644303-003) MSD mg/L 5.000 106% 89-111 <br /> MSRPD mg/L 0.1% :59 <br /> MS mg/L 5.000 104% 89-111 <br /> (VI2644440-008) MSD mg/L 5.000 105% 89-111 <br /> MSRPD mg/L 0.7% <_9 <br /> Sulfate 300.0 06/24/2026:207151LDM Blank mg/L ND <0.5 <br /> LCS mg/L 50.00 105% 90-110 <br /> MS mg/L 100.0 104% 18-165 <br /> (VI2644303-003) MSD mg/L 100.0 104% 18-165 <br /> MSRPD mg/L 0.1% _<7 <br /> MS mg/L 100.0 101% 18-165 <br /> (VI2644440-008) MSD mg/L 100.0 102% 18-165 <br /> MSRPD mg/L 0.7% :57 <br /> Nitrate 450ONO3F 06/05/2026:206304JGH Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 96.1% 80-120 <br /> MS mg/L 5.609 88.6% 66-125 <br /> (CH 2674998-002) MSD mg/L 5.609 93.8% 66-125 <br /> MSRPD mg/L 1.7% :530.4 <br /> Nitrate+Nitrite as N 450ONO3F 06/05/2026:206304JGH Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 96.1% 80-120 <br /> MS mg/L 5.609 88.6% 66-125 <br /> (CH 2674998-002) MSD mg/L 5.609 93.8% 66-125 <br /> MSRPD mg/L 1.7% :530.4 <br /> Nitrate Nitrogen 450ONO3F 06/05/2026:206304JGH Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 96.1% 80-120 <br /> MS mg/L 5.609 88.6% 66-125 <br /> (CH 2674998-002) MSD mg/L 5.609 93.8% 66-125 <br /> MSRPD mg/L 1.7% :530.4 <br /> Nitrite as Nitrogen 450ONO3F 06/05/2026:206328JGH Blank mg/L ND <0.2 <br /> LCS mg/L 1.218 101% 80-120 <br /> Page 7 of 8 Page 7 of 8 <br />