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May 8, 2026 <br /> Lab No. : STK2636O42 <br /> San Joaquin County EHD <br /> Customer No. : 3017919 <br /> Quality Control -Wet Chem <br /> . ®� mmcm <br /> Wet Chem <br /> Alkalinity(as CaCO3) 2320B (SP 2608175-005) Dup mg/L 10 <br /> Bicarbonate 2320B (SP 2608175-005) Dup mg/L 10 <br /> Carbonate 2320B (SP 2608175-005) Dup mg/L 10 <br /> E.C. 2320B (SP 2608175-005) Dup umhos/cm 5 <br /> Hydroxide 2320B (SP 2608175-005) Dup mg/L 10 <br /> Solids,Total Dissolved 2540CE 05/01/2026:204763CTL Blank mg/L ND <10 <br /> LCS mg/L 990.5 102% 90-110 <br /> (SP 2608356-001) Dup mg/L 0.8% 12.2 <br /> (SP 2608356-001) Dup mg/L 2.46% 12.2 <br /> Chloride 300.0 05/06/2026:204912LDM Blank mg/L ND <1 <br /> LCS mg/L 25.00 97.6% 90-110 <br /> MS mg/L 50.00 84.8% 67-117 <br /> (VI2643049-006) MSD mg/L 50.00 84.8% 67-117 <br /> MSRPD mg/L 0.0% :57 <br /> MS mg/L 50.00 80.3% 67-117 <br /> (SP 2608444-001) MSD mg/L 50.00 78.9% 67-117 <br /> MSRPD mg/L 0.7% :57 <br /> Fluoride 300.0 05/06/2026:204912LDM Blank mg/L ND <0.1 <br /> LCS mg/L 2.500 95.4% 90-110 <br /> MS mg/L 5.000 101% 89-111 <br /> (VI2643049-006) MSD mg/L 5.000 101% 89-111 <br /> MSRPD mg/L 0.0% :59 <br /> MS mg/L 5.000 99.9% 89-111 <br /> (SP 2608444-001) MSD mg/L 5.000 100% 89-111 <br /> MSRPD mg/L 0.2% :59 <br /> Sulfate 300.0 05/06/2026:204912LDM Blank mg/L ND <0.5 <br /> LCS mg/L 50.00 97.6% 90-110 <br /> MS mg/L 100.0 97.0% 18-165 <br /> (VI2643049-006) MSD mg/L 100.0 97.1% 18-165 <br /> MSRPD mg/L 0.0% :57 <br /> MS mg/L 100.0 81.2% 18-165 <br /> (SP 2608444-001) MSD mg/L 100.0 81.5% 18-165 <br /> MSRPD mg/L 0.1% :57 <br /> Nitrate 4500NO3F 04/30/2026:204711MM1 Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 92.6% 80-120 <br /> MS mg/L 5.609 89.5% 66-125 <br /> (STK2636042-001) MSD mg/L 5.609 88.6% 66-125 <br /> MSRPD mg/L 1.0% :530.4 <br /> Nitrate+Nitrite as N 4500NO3F 04/30/2026:204711MM1 Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 92.6% 80-120 <br /> MS mg/L 5.609 89.5% 66-125 <br /> (STK2636042-001) MSD mg/L 5.609 88.6% 66-125 <br /> MSRPD mg/L 1.0% :530.4 <br /> Nitrate Nitrogen 4500NO3F 04/30/2026:204711MM1 Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 92.6% 80-120 <br /> MS mg/L 5.609 89.5% 66-125 <br /> (STK2636042-001) MSD mg/L 5.609 88.6% 66-125 <br /> MSRPD mg/L 1.0% 1530.4 <br /> Nitrite as Nitrogen 4500NO3F 04/30/2026:204745MM1 Blank mg/L ND <0.2 <br /> LCS mg/L 1.218 107% 80-120 <br /> Page 7 of 8 Page 7 of 8 <br />