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October 30, 2025 <br /> San Joaquin County EHD Lab No. : STK2556097 <br /> Customer No. : 3017919 <br /> Quality Control - Wet Chem <br /> Wet Chem <br /> Alkalinity(as CaCO3) 2320B (VI 2547331-001) Dup mg/L 0.9% 10 <br /> Bicarbonate 2320B (VI 2547331-001) Dup mg/L 0.8% 10 <br /> Carbonate 2320B (VI 2547331-001) Dup mg/L 0% 10 <br /> E.C. 2320B (VI 2547331-001) Dup umhos/cm 0.4% 5 <br /> Hydroxide 2320B (VI 2547331-001) Dup mg/L 0% 10 <br /> Solids,Total Dissolved 2540CE 10/20/2025:211668CTL Blank mg/L ND <20 <br /> LCS mg/L 991.1 101% 90-110 <br /> (SP 2517804-001) Dup mg/L 0.05% 5 <br /> (SP 2517804-001) Dup mg/L 1.63% 5 <br /> Chloride 300.0 10/23/2025:211877LDM Blank mg/L ND <1 <br /> LCS mg/L 25.00 100% 90-110 <br /> MS mg/L 50.00 99.2% 67-117 <br /> (STK2556097-001) MSD mg/L 50.00 98.8% 67-117 <br /> MSRPD mg/L 0.3% 57 <br /> MS mg/L 50.00 97.1% 67-117 <br /> (VI 2547428-001) MSD mg/L 50.00 97.5% 67-117 <br /> MSRPD mg/L 0.3% :57 <br /> Fluoride 300.0 10/23/2025:211877LDM Blank mg/L ND <0.1 <br /> LCS mg/L 2.500 109% 90-110 <br /> MS mg/L 5.000 105% 89-111 <br /> (STK2556097-001) MSD mg/L 5.000 104% 89-111 <br /> MSRPD mg/L 0.8% :59 <br /> MS mg/L 5.000 104% 89-111 <br /> (VI 2547428-001) MSD mg/L 5.000 103% 89-111 <br /> MSRPD mg/L 0.3% :59 <br /> Sulfate 300.0 10/23/2025:211877LDM Blank mg/L ND <0.5 <br /> LCS mg/L 50.00 100% 90-110 <br /> MS mg/L 100.0 98.8% 18-165 <br /> (STK2556097-001) MSD mg/L 100.0 98.5% 18-165 <br /> MSRPD mg/L 0.3% :57 <br /> MS mg/L 100.0 96.4% 18-165 <br /> (VI 2547428-001) MSD mg/L 100.0 97.0% 18-165 <br /> MSRPD mg/L 0.6% s7 <br /> Nitrate 450ONO3F 10/17/2025:211607MM1 Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 95.0% 80-120 <br /> MS mg/L 5.609 90.6% 66-125 <br /> (VI 2547415-001) MSD mg/L 5.609 92.2% 66-125 <br /> MSRPD mg/L 0.6% :530.4 <br /> Nitrate+Nitrite as N 450ONO3F 10/17/2025:211607MM1 Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 95.0% 80-120 <br /> MS mg/L 5.609 90.6% 66-125 <br /> (VI 2547415-001) MSD mg/L 5.609 92.2% 66-125 <br /> MSRPD mg/L 0.6% :530.4 <br /> Nitrate Nitrogen 450ONO3F 10/17/2025:211607MM1 Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 95.0% 80-120 <br /> MS mg/L 5.609 90.6% 66-125 <br /> (VI 2547415-001) MSD mg/L 5.609 92.2% 66-125 <br /> MSRPD mg/L 0.6% :_30.4 <br /> Nitrite as Nitrogen 450ONO3F 10/17/2025:211624MM1 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 />