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February 1, 2024 <br /> Lab No. : STK243081O <br /> San Joaquin County EHD <br /> Customer No. : 3017919 <br /> Quality Control -Wet Chem <br /> Wet Chem <br /> Alkalinity(as CaCO3) 2320B (SP 2400825-004) Dup mg/L 0.2% 10 <br /> Bicarbonate 2320B (SP 2400825-004) Dup mg/L 0.2% 10 <br /> E.C. 2320B (SP 2400825-004) Dup umhos/cm 0.2% 5 <br /> Solids,Total Dissolved 2540CE 01/16/2024:200602CTL Blank mg/L ND <20 <br /> LCS mg/L 991.5 97.8% 90-110 <br /> (VI 2440355-001) Dup mg/L 2.50% 5 <br /> (VI 2440355-001) Dup mg/L 1.97% 5 <br /> Chloride 300.0 01/25/2024:201022LDM Blank mg/L ND <1 <br /> LCS mg/L 25.00 97.7% 90-110 <br /> MS mg/L 50.00 96.5% 67-117 <br /> (STK2430810-001) MSD mg/L 50.00 96.5% 67-117 <br /> MSRPD mg/L 0.0% :_7 <br /> MS mg/L 50.00 98.3% 67-117 <br /> (VI 2440355-003) MSD mg/L 50.00 98.3% 67-117 <br /> MSRPD mg/L 0.0% :57 <br /> Fluoride 300.0 01/25/2024:201022LDM Blank mg/L ND <0.1 <br /> LCS mg/L 2.500 98.6% 90-110 <br /> MS mg/L 5.000 102% 89-111 <br /> (STK2430810-001) MSD mg/L 5.000 102% 89-111 <br /> MSRPD mg/L 0.3% :59 <br /> MS mg/L 5.000 103% 89-111 <br /> (VI 2440355-003) MSD mg/L 5.000 103% 89-111 <br /> MSRPD mg/L 0.2% :59 <br /> Sulfate 300.0 01/25/2024:201022LDM Blank mg/L ND <0.5 <br /> LCS mg/L 50.00 99.0% 90-110 <br /> MS mg/L 100.0 100% 18-165 <br /> (STK2430810-001) MSD mg/L 100.0 101% 18-165 <br /> MSRPD mg/L 0.0% :57 <br /> MS mg/L 100.0 100% 18-165 <br /> (VI 2440355-003) MSD mg/L 100.0 100% 18-165 <br /> MSRPD mg/L 0.0% :_7 <br /> Nitrite as Nitrogen 4500NO2B 01/13/2024:200577AMM MS mg/L 0.2284 95.8% 1-173 <br /> (STK2430811-001) MSD mg/L 0.2284 97.6% 1-173 <br /> MSRPD mg/L 1.9% .520 <br /> Nitrate 4500NO3F 01/19/2024:200785ILP Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 99.8% 80-120 <br /> MS mg/L 5.609 105% 66-125 <br /> (CH 2470420-002) MSD mg/L 5.609 107% 66-125 <br /> MSRPD mg/L 1.9% :530.4 <br /> Nitrate+Nitrite as N 4500NO3F 01/19/2024:200785ILP Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 99.8% 80-120 <br /> MS mg/L 5.609 105% 66-125 <br /> (CH 2470420-002) MSD mg/L 5.609 107% 66-125 <br /> MSRPD mg/L 1.9% :_30.4 <br /> Nitrate Nitrogen 4500NO3F O1/19/2024:200785ILP Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 99.8% 80-120 <br /> MS mg/L 5.609 105% 66-125 <br /> (CH 2470420-002) MSD mg/L 5.609 107% 66-125 <br /> MSRPD mg/L 1.9% :530.4 <br /> MBAS 5540C 01/13/2024:200548AMM MS mg/L 1.000 100% 90-110 <br /> Page 6 of 7 Page 6 of 7 <br />