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November 18, 2025 <br /> Lab No. : STK2556994 <br /> San Joaquin County EHD <br /> Customer No. : 3017919 <br /> Quality Control - Wet Chem <br /> Wet Chem <br /> Alkalinity(as CaCO3) 2320B (VI 2547910-001) Dup mg/L 0.05% 10 <br /> Bicarbonate 2320B (VI 2547910-001) Dup mg/L 0.09% 10 <br /> Carbonate 2320B (VI 2547910-001) Dup mg/L 0% 10 <br /> E.C. 2320B (VI 2547910-001) Dup umhos/cm 0.08% 5 <br /> Hydroxide 2320B (VI 2547910-001) Dup mg/L 0% 10 <br /> Solids,Total Dissolved 2540CE 11/06/2025:212478CTL Blank mg/L ND <20 <br /> LCS mg/L 991.1 101% 90-110 <br /> (SP 2519012-001) Dup mg/L 0.6% 5 <br /> (SP 2519012-001) Dup mg/L 0.9% 5 <br /> Chloride 300.0 11/13/2025:212796LDM Blank mg/L ND <1 <br /> LCS mg/L 25.00 104% 90-110 <br /> MS mg/L 50.00 102% 67-117 <br /> (VI 2547783-001) MSD mg/L 50.00 102% 67-117 <br /> MSRPD mg/L 0.1% :57 <br /> MS mg/L 50.00 104% 67-117 <br /> (STK2556892-003) MSD mg/L 50.00 104% 67-117 <br /> MSRPD mg/L 0.2% :57 <br /> Fluoride 300.0 11/13/2025:212796LDM Blank mg/L ND <0.1 <br /> LCS mg/L 2.500 102% 90-110 <br /> MS mg/L 5.000 105% 89-111 <br /> (VI 2547783-001) MSD mg/L 5.000 105% 89-111 <br /> MSRPD mg/L 0.1% :59 <br /> MS mg/L 5.000 105% 89-111 <br /> (STK2556892-003) MSD mg/L 5.000 105% 89-111 <br /> MSRPD mg/L 0.2% :59 <br /> Sulfate 300.0 11/13/2025:212796LDM Blank mg/L ND <0.5 <br /> LCS mg/L 50.00 104% 90-110 <br /> MS mg/L 100.0 102% 18-165 <br /> (VI 2547783-001) MSD mg/L 100.0 102% 18-165 <br /> MSRPD mg/L 0.1% :57 <br /> MS mg/L 100.0 104% 18-165 <br /> (STK2556892-003) MSD mg/L 100.0 104% 18-165 <br /> MSRPD mg/L 0.2% :57 <br /> Nitrate 450ONO3F 11/05/2025:212427MM1 Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 95.2% 80-120 <br /> MS mg/L 5.609 94.0% 66-125 <br /> (VI 2547783-001) MSD mg/L 5.609 95.0% 66-125 <br /> MSRPD mg/L 0.5% _:30.4 <br /> Nitrate+Nitrite as N 450ONO3F 11/05/2025:212427MM1 Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 95.2% 80-120 <br /> MS mg/L 5.609 94.0% 66-125 <br /> (VI 2547783-001) MSD mg/L 5.609 95.0% 66-125 <br /> MSRPD mg/L 0.5% :_30.4 <br /> Nitrate Nitrogen 450ONO3F 11/05/2025:212427MM1 Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 95.2% 80-120 <br /> MS mg/L 5.609 94.0% 66-125 <br /> (VI 2547783-001) MSD mg/L 5.609 95.0% 66-125 <br /> MSRPD mg/L 0.5% :530.4 <br /> Nitrite as Nitrogen 450ONO3F 11/05/2025:212452MM1 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 />