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August 13, 2024 Lab No. : STK2450298 San Joaquin County EHD Customer No. : 3017919 Quality Control -Wet Chem . ®� MMCM Wet Chem Alkalinity(as CaCO3) 2320B (CH 2475750-004) Dup mg/L 0.07% 10 Bicarbonate 2320B (CH 2475750-004) Dup mg/L 0% 10 Carbonate 2320B (CH 2475750-004) Dup mg/L 0% 10 E.C. 2320B (CH 2475750-004) Dup umhos/cm 0.4% 5 Hydroxide 2320B (CH 2475750-004) Dup mg/L 0% 10 Solids,Total Dissolved 2540CE 07/16/2024:207876CTL Blank mg/L ND <20 LCS mg/L 990.5 99.7% 90-110 (SP 2411286-004) Dup mg/L 0.5% 5 (SP 2411286-004) Dup mg/L 2.10% 5 Chloride 300.0 08/08/2024:208887LFS Blank mg/L ND <1 LCS mg/L 25.00 102% 90-110 MS mg/L 50.00 101% 67-117 (STK2451505-001) MSD mg/L 50.00 101% 67-117 MSRPD mg/L 0.0% :57 Fluoride 300.0 08/08/2024:208887LFS Blank mg/L ND <0.1 LCS mg/L 2.500 97.8% 90-110 MS mg/L 5.000 102% 89-111 (STK2451505-001) MSD mg/L 5.000 99.9% 89-111 MSRPD mg/L 2.1% :59 Sulfate 300.0 08/08/2024:208887LFS Blank mg/L ND <0.5 LCS mg/L 50.00 102% 90-110 MS mg/L 100.0 102% 18-165 (STK2451505-001) MSD mg/L 100.0 102% 18-165 MSRPD mg/L 0.1% :57 Nitrite as Nitrogen 4500NO2B 07/13/2024:207887AMM MS mg/L 0.2284 86.2% 1-173 (VI 2445592-001) MSD mg/L 0.2284 89.1% 1-173 MSRPD mg/L 3.3% :520 Nitrate 4500NO3F 07/24/2024:208188ILP Blank mg/L ND <0.4 LCS mg/L 11.22 99.2% 80-120 MS mg/L 5.609 99.2% 66-125 (SP 2411925-001) MSD mg/L 5.609 100% 66-125 MSRPD mg/L 1.1% :530.4 Nitrate+Nitrite as N 4500NO3F 07/24/2024:208188ILP Blank mg/L ND <0.4 LCS mg/L 11.22 99.2% 80-120 MS mg/L 5.609 99.2% 66-125 (SP 2411925-001) MSD mg/L 5.609 100% 66-125 MSRPD mg/L 1.1% :530.4 Nitrate Nitrogen 4500NO3F 07/24/2024:208188ILP Blank mg/L ND <0.4 LCS mg/L 11.22 99.2% 80-120 MS mg/L 5.609 99.2% 66-125 (SP 2411925-001) MSD mg/L 5.609 100% 66-125 MSRPD mg/L 1.1% :530.4 MBAS 5540C 07/13/2024:207892AMM MS mg/L 10.00 100% 90-110 (STK2450298-001) MSD mg/L 10.00 100% 90-110 MSRPD mg/L 0.0% :50.1 Page 7 of 8 Page 7 of 8