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December 17, 2025 <br /> San Joaquin County EHD Lab No. : STK2558392 <br /> Customer No. : 3017919 <br /> Quality Control -Wet Chem <br /> IM <br /> Wet Chem <br /> Alkalinity(as CaCO3) 2320B (SP 2521089-001) Dup mg/L 0.3% 10 <br /> Bicarbonate 2320B (SP 2521089-001) Dup mg/L 0.3% 10 <br /> Carbonate 2320B (SP 2521089-001) Dup mg/L 0% 10 <br /> E.C. 2320B (SP 2521089-001) Dup umhos/cm 0.08% 5 <br /> Hydroxide 2320B (SP 2521089-001) Dup mg/L 0% 10 <br /> Solids,Total Dissolved 2540CE 12/05/2025:213599CTL Blank mg/L ND <20 <br /> LCS mg/L 991.1 102% 90-110 <br /> (SP 2520772-004) Dup mg/L 1.52% 5 <br /> (SP 2520772-004) Dup mg/L 1.92% 5 <br /> Chloride 300.0 12111/2025:213859LDM Blank mg/L ND <1 <br /> LCS mg/L 25.00 109% 90-110 <br /> MS mg/L 50.00 88.5% 67-117 <br /> (SP 2521137-001) MSD mg/L 50.00 87.7% 67-117 <br /> MSRPD mg/L 0.4% _<7 <br /> MS mg/L 50.00 87.0% 67-117 <br /> (SP 2521060-002) MSD mg/L 50.00 89.0% 67-117 <br /> MSRPD mg/L 0.7% <_7 <br /> Fluoride 300.0 12/11/2025:213859LDM Blank mg/L ND <0.1 <br /> LCS mg/L 2.500 107% 90-110 <br /> MS mg/L 5.000 106% 89-111 <br /> (SP 2521137-001) MSD mg/L 5.000 106% 89-111 <br /> MSRPD mg/L 0.2% <_9 <br /> MS mg/L 5.000 105% 89-111 <br /> (SP 2521060-002) MSD mg/L 5.000 104% 89-111 <br /> MSRPD mg/L 0.5% :59 <br /> Sulfate 300.0 12/11/2025:213859LDM Blank mg/L ND <0.5 <br /> LCS mg/L 50.00 109% 90-110 <br /> MS mg/L 100.0 104% 18-165 <br /> (SP 2521137-001) MSD mg/L 100.0 104% 18-165 <br /> MSRPD mg/L 0.2% :57 <br /> MS mg/L 100.0 87.2% 18-165 <br /> (SP 2521060-002) MSD mg/L 100.0 89.9% 18-165 <br /> MSRPD mg/L 1.4% 157 <br /> Nitrate 450ONO3F 12/04/2025:213555MM1 Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 95.8% 80-120 <br /> MS mg/L 5.609 99.7% 66-125 <br /> (SP 2520640-005) MSD mg/L 5.609 95.2% 66-125 <br /> MSRPD mg/L 3.7% :530.4 <br /> Nitrate+Nitrite as N 450ONO3F 12/04/2025:213555MM1 Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 95.8% 80-120 <br /> MS mg/L 5.609 99.7% 66-125 <br /> (SP 2520640-005) MSD mg/L 5.609 95.2% 66-125 <br /> MSRPD mg/L 3.7% <_30.4 <br /> Nitrate Nitrogen 450ONO3F 12/04/2025:213555MM1 Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 95.8% 80-120 <br /> MS mg/L 5.609 99.7% 66-125 <br /> (SP 2520640-005) MSD mg/L 5.609 95.2% 66-125 <br /> MSRPD mg/L 3.7% <_30.4 <br /> Nitrite as Nitrogen 450ONO3F 12/04/2025:213574MM1 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 />