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July 16, 2026 <br /> San Joaquin County EHD Lab No. STK2650005: <br /> Customer No. : 3017919 <br /> Quality Control -Wet Chem <br /> Wet Chem <br /> Alkalinity(as CaCO3) 2320B (SP 2613382-002) Dup mg/L 0.3% 10 <br /> Bicarbonate 2320B (SP 2613382-002) Dup mg/L 0.2% 10 <br /> Carbonate 2320B (SP 2613382-002) Dup mg/L 0% 10 <br /> E.C. 2320B (SP 2613382-002) Dup umhos/cm 0% 5 <br /> Hydroxide 2320B (SP 2613382-002) Dup mg/L 0% 10 <br /> Solids,Total Dissolved 2540CE 07/09/2026:207757CTL Blank mg/L ND <20 <br /> LCS mg/L 990.5 102% 90-110 <br /> (CC 2682284-005) Dup mg/L 0.6% 5 <br /> (CC 2682284-005) Dup mg/L 0.5% 5 <br /> Chloride 300.0 07/10/2026:207844LDM Blank mg/L ND <1 <br /> LCS mg/L 25.00 99.4% 90-110 <br /> MS mg/L 50.00 90.0% 67-117 <br /> (STK2639864-001) MSD mg/L 50.00 90.3% 67-117 <br /> MSRPD mg/L 0.2% 157 <br /> MS mg/L 50.00 121% 67-117 435 <br /> (CH 2676556-001) MSD mg/L 50.00 121% 67-117 435 <br /> MSRPD mg/L 0.1% :57 <br /> Fluoride 300.0 07/10/2026:207844LDM Blank mg/L ND <0.1 <br /> LCS mg/L 2.500 98.4% 90-110 <br /> MS mg/L 5.000 104% 89-111 <br /> (STK2639864-001) MSD mg/L 5.000 105% 89-111 <br /> MSRPD mg/L 0.2% :59 <br /> MS mg/L 5.000 110% 89-111 <br /> (CH 2676556-001) MSD mg/L 5.000 110% 89-111 <br /> MSRPD mg/L 0.0% s9 <br /> Sulfate 300.0 07/10/2026:207844LDM Blank mg/L ND <0.5 <br /> LCS mg/L 50.00 101% 90-110 <br /> MS mg/L 100.0 104% 18-165 <br /> (STK2639864-001) MSD mg/L 100.0 104% 18-165 <br /> MSRPD mg/L 0.1% :57 <br /> MS mg/L 100.0 103% 18-165 <br /> (CH 2676556-001) MSD mg/L 100.0 104% 18-165 <br /> MSRPD mg/L 0.2% :57 <br /> Nitrate 450ONO3F 07/08/2026:207688MM1 Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 92.8% 80-120 <br /> MS mg/L 5.609 92.5% 66-125 <br /> (STK2639853-001) MSD mg/L 5.609 91.3% 66-125 <br /> MSRPD mg/L 0.6% :530.4 <br /> Nitrate+Nitrite as N 450ONO3F 07/08/2026:207688MM1 Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 92.8% 80-120 <br /> MS mg/L 5.609 92.5% 66-125 <br /> (STK2639853-001) MSD mg/L 5.609 91.3% 66-125 <br /> MSRPD mg/L 0.6% :530.4 <br /> Nitrate Nitrogen 450ONO3F 07/08/2026:207688MM1 Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 92.8% 80-120 <br /> MS mg/L 5.609 92.5% 66-125 <br /> (STK2639853-001) MSD mg/L 5.609 91.3% 66-125 <br /> MSRPD mg/L 0.6% <_30.4 <br /> Nitrite as Nitrogen 450ONO3F 07/08/2026:207736MM1 Blank mg/L ND <0.2 <br /> LCS mg/L 1.218 101% 80-120 <br /> Page 7 of 8 Page 7 of 8 <br />