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October 2, 2026 <br /> Lab No. : STK2654381 <br /> San Joaquin County EHD <br /> Customer No. : 3017919 <br /> Quality Control -Wet Chem <br /> Wet Chem <br /> Alkalinity(as CaCO3) 2320B (SP 2618403-003) Dup mg/L 0.2% 10 <br /> Bicarbonate 2320B (SP 2618403-003) Dup mg/L 0.2% 10 <br /> Carbonate 2320B (SP 2618403-003) Dup mg/L 0% 10 <br /> E.C. 2320B (SP 2618403-003) Dup umhos/cm 0.1% 5 <br /> Hydroxide 2320B (SP 2618403-003) Dup mg/L 0% 10 <br /> Solids,Total Dissolved 2540CE 09/24/2026:211195CTL Blank mg/L ND <20 <br /> LCS mg/L 991.5 100% 90-110 <br /> (VI2646920-001) Dup mg/L 0.7% 5 <br /> (VI2646920-001) Dup mg/L 1.08% 5 <br /> Chloride 300.0 09/24/2026:211216LDM Blank mg/L ND <1 <br /> LCS mg/L 25.00 96.1% 90-110 <br /> MS mg/L 50.00 96.8% 67-117 <br /> (STK2651955-004) MSD mg/L 50.00 96.9% 67-117 <br /> MSRPD mg/L 0.1% :57 <br /> MS mg/L 50.00 97.8% 67-117 <br /> (STK2651955-008) MSD mg/L 50.00 97.8% 67-117 <br /> MSRPD mg/L 0.0% :57 <br /> Fluoride 300.0 09/24/2026:211216LDM Blank mg/L ND <0.1 <br /> LCS mg/L 2.500 104% 90-110 <br /> MS mg/L 5.000 100% 89-111 <br /> (STK2651955-004) MSD mg/L 5.000 99.2% 89-111 <br /> MSRPD mg/L 0.7% :59 <br /> MS mg/L 5.000 100% 89-111 <br /> (STK2651955-008) MSD mg/L 5.000 99.8% 89-111 <br /> MSRPD mg/L 0.2% :59 <br /> Sulfate 300.0 09/24/2026:211216LDM Blank mg/L ND <0.5 <br /> LCS mg/L 50.00 99.5% 90-110 <br /> MS mg/L 100.0 95.1% 18-165 <br /> (STK2651955-004) MSD mg/L 100.0 95.5% 18-165 <br /> MSRPD mg/L 0.3% :57 <br /> MS mg/L 100.0 98.7% 18-165 <br /> (STK2651955-008) MSD mg/L 100.0 98.8% 18-165 <br /> MSRPD mg/L 0.1% :57 <br /> Nitrate 450ONO3F 09/23/2026:211134MM1 Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 98.8% 80-120 <br /> MS mg/L 5.609 99.3% 66-125 <br /> (SP 2618144-001) MSD mg/L 5.609 99.8% 66-125 <br /> MSRPD mg/L 0.3% :530.4 <br /> Nitrate+Nitrite as N 450ONO3F 09/23/2026:211134MM1 Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 98.8% 80-120 <br /> MS mg/L 5.609 99.3% 66-125 <br /> (SP 2618144-001) MSD mg/L 5.609 99.8% 66-125 <br /> MSRPD mg/L 0.3% :530.4 <br /> Nitrate Nitrogen 450ONO3F 09/23/2026:211134MM1 Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 98.8% 80-120 <br /> MS mg/L 5.609 99.3% 66-125 <br /> (SP 2618144-001) MSD mg/L 5.609 99.8% 66-125 <br /> MSRPD mg/L 0.3% 1530.4 <br /> Nitrite as Nitrogen 450ONO3F 09/23/2026:211166MM1 Blank mg/L ND <0.2 <br /> LCS mg/L 1.218 101% 80-120 <br /> Page 7 of 8 <br />