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May 8, 2026 <br /> Lab No. : STK2635980 <br /> San Joaquin County EHD <br /> Customer No. : 3017919 <br /> Quality Control -Wet Chem <br /> Wet Chem <br /> Alkalinity(as CaCO3) 2320B (VI 2642982-001) Dup mg/L 0.4% 10 <br /> Bicarbonate 2320B (VI 2642982-001) Dup mg/L 0.4% 10 <br /> Carbonate 2320B (VI 2642982-001) Dup mg/L 0% 10 <br /> E.C. 2320B (VI 2642982-001) Dup umhos/cm 0.5% 5 <br /> Hydroxide 2320B (VI 2642982-001) Dup mg/L 0% 10 <br /> Solids,Total Dissolved 2540CE 04/30/2026:204710CTL Blank mg/L ND <20 <br /> LCS mg/L 990.5 101% 90-110 <br /> (SP 2608259-001) Dup mg/L 0.06% 5 <br /> (SP 2608259-001) Dup mg/L 0.6% 5 <br /> Chloride 300.0 05/04/2026:204870LDM Blank mg/L ND <1 <br /> LCS mg/L 25.00 102% 90-110 <br /> MS mg/L 50.00 94.4% 67-117 <br /> (VI 2642994-001) MSD mg/L 50.00 94.6% 67-117 <br /> MSRPD mg/L 0.2% :57 <br /> MS mg/L 50.00 95.0% 67-117 <br /> (VI 2642994-002) MSD mg/L 50.00 95.0% 67-117 <br /> MSRPD mg/L 0.0% <_7 <br /> Fluoride 300.0 05/04/2026:204870LDM Blank mg/L ND <0.1 <br /> LCS mg/L 2.500 101% 90-110 <br /> MS mg/L 5.000 104% 89-111 <br /> (VI 2642994-001) MSD mg/L 5.000 103% 89-111 <br /> MSRPD mg/L 0.1% :59 <br /> MS mg/L 5.000 105% 89-111 <br /> (VI 2642994-002) MSD mg/L 5.000 105% 89-111 <br /> MSRPD mg/L 0.0% :59 <br /> Sulfate 300.0 05/04/2026:204870LDM Blank mg/L ND <0.5 <br /> LCS mg/L 50.00 103% 90-110 <br /> MS mg/L 100.0 99.0% 18-165 <br /> (VI 2642994-001) MSD mg/L 100.0 99.3% 18-165 <br /> MSRPD mg/L 0.3% <_7 <br /> MS mg/L 100.0 99.6% 18-165 <br /> (VI 2642994-002) MSD mg/L 100.0 99.6% 18-165 <br /> MSRPD mg/L 0.0% s7 <br /> Nitrate 4500NO3F 04/29/2026:204659MM1 Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 95.6% 80-120 <br /> MS mg/L 5.609 93.6% 66-125 <br /> (SP 2608182-001) MSD mg/L 5.609 93.1% 66-125 <br /> MSRPD mg/L 0.5% :530.4 <br /> Nitrate+Nitrite as N 4500NO3F 04/29/2026:204659MM1 Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 95.6% 80-120 <br /> MS mg/L 5.609 93.6% 66-125 <br /> (SP 2608182-001) MSD mg/L 5.609 93.1% 66-125 <br /> MSRPD mg/L 0.5% :530.4 <br /> Nitrate Nitrogen 4500NO3F 04/29/2026:204659MM1 Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 95.6% 80-120 <br /> MS mg/L 5.609 93.6% 66-125 <br /> (SP 2608182-001) MSD mg/L 5.609 93.1% 66-125 <br /> MSRPD mg/L 0.5% :530.4 <br /> Nitrite as Nitrogen 4500NO3F 04/29/2026:204686MM1 Blank mg/L ND <0.2 <br /> LCS mg/L 1.218 104% 80-120 <br /> Page 7 of 8 Page 7 of 8 <br />