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April 6, 2026 <br /> Lab No. : STK2633934 <br /> San Joaquin County EHD <br /> Customer No. : 3017919 <br /> Quality Control - Wet Chem <br /> Wet Chem <br /> Alkalinity(as CaCO3) 2320B (VI 2642124-008) Dup mg/L 0.3% 10 <br /> Bicarbonate 2320B (VI 2642124-008) Dup mg/L 1.26% 10 <br /> Carbonate 2320B (VI 2642124-008) Dup mg/L 4.26% 10 <br /> E.C. 2320B (VI 2642124-008) Dup umhos/cm 0.3% 5 <br /> Hydroxide 2320B (VI 2642124-008) Dup mg/L 0% 10 <br /> Solids,Total Dissolved 2540CE 03/2612026:203196CTL Blank mg/L ND <20 <br /> LCS mg/L 990.5 102% 90-110 <br /> (CC 2680950-004) Dup mg/L 1.07% 5 <br /> (CC 2680950-004) Dup mg/L 2.88% 5 <br /> Chloride 300.0 04/01/2026:203493LDM Blank mg/L ND <1 <br /> LCS mg/L 25.00 101% 90-110 <br /> MS mg/L 50.00 97.7% 67-117 <br /> (VI 2642181-001) MSD mg/L 50.00 97.2% 67-117 <br /> MSRPD mg/L 0.4% :57 <br /> MS mg/L 50.00 98.5% 67-117 <br /> (VI 2642088-001) MSD mg/L 50.00 98.5% 67-117 <br /> MSRPD mg/L 0.0% :57 <br /> Fluoride 300.0 04/O1/2026:203493LDM Blank mg/L ND <0.1 <br /> LCS mg/L 2.500 100% 90-110 <br /> MS mg/L 5.000 105% 89-111 <br /> (VI 2642181-001) MSD mg/L 5.000 105% 89-111 <br /> MSRPD mg/L 0.3% 159 <br /> MS mg/L 5.000 103% 89-111 <br /> (VI 2642088-001) MSD mg/L 5.000 103% 89-111 <br /> MSRPD mg/L 0.0% :59 <br /> Sulfate 300.0 04/O1/2026:203493LDM Blank mg/L ND <0.5 <br /> LCS mg/L 50.00 102% 90-110 <br /> MS mg/L 100.0 103% 18-165 <br /> (VI 2642181-001) MSD mg/L 100.0 102% 18-165 <br /> MSRPD mg/L 0.3% :_7 <br /> MS mg/L 100.0 101% 18-165 <br /> (VI 2642088-001) MSD mg/L 100.0 101% 18-165 <br /> MSRPD mg/L 0.0% :57 <br /> Nitrate 4500NO3F 03/25/2026:203153MM1 Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 94.8% 80-120 <br /> MS mg/L 5.609 92.7% 66-125 <br /> (VI 2642106-001) MSD mg/L 5.609 94.3% 66-125 <br /> MSRPD mg/L 1.0% :530.4 <br /> Nitrate+Nitrite as N 4500NO3F 03/25/2026:203153MM1 Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 94.8% 80-120 <br /> MS mg/L 5.609 92.7% 66-125 <br /> (VI 2642106-001) MSD mg/L 5.609 94.3% 66-125 <br /> MSRPD mg/L 1.0% :530.4 <br /> Nitrate Nitrogen 4500NO3F 03/25/2026:203153MM1 Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 94.8% 80-120 <br /> MS mg/L 5.609 92.7% 66-125 <br /> (VI 2642106-001) MSD mg/L 5.609 94.3% 66-125 <br /> MSRPD mg/L 1.0% :530.4 <br /> Nitrite as Nitrogen 4500NO3F 03/25/2026:203181MM1 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 />