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March 8, 2023 <br /> Lab No. : STK2332028 <br /> San Joaquin County EHD <br /> Customer No. : 3017919 <br /> Quality Control -Wet Chem <br /> Wet Chem <br /> Alkalinity(as CaCO3) 2320B 02/19/2023:201647AMM ND mg/L 0.1% 10 <br /> Bicarbonate 2320B (SP 2302447-008) Dup mg/L 0.2% 10 <br /> E.C. 2320B (SP 2302447-008) Dup umhos/cm 0.1% 5 <br /> Solids,Total Dissolved 2540CE 02/15/2023:201693CTL Blank mg/L ND <20 <br /> LCS mg/L 990.8 102% 90-110 <br /> (VI 2340896-001) Dup mg/L 0.4% 5 <br /> (VI 2340896-001) Dup mg/L 0.7% 5 <br /> Chloride 300.0 02/21/2023:202213LDM Blank mg/L ND <1 <br /> LCS mg/L 25.00 104% 90-110 <br /> MS mg/L 50.00 99.5% 85-121 <br /> (STK2332028-001) MSD mg/L 50.00 104% 85-121 <br /> MSRPD mg/L 10.00 4.2% 5519 <br /> MS mg/L 50.00 65.8% 85-121 435 <br /> (SP 2302484-013) MSD mg/L 50.00 66.2% 85-121 435 <br /> MSRPD mg/L 10.00 0.1% 5519 <br /> Fluoride 300.0 02/21/2023:202213LDM Blank mg/L ND <0.1 <br /> LCS mg/L 2.500 104% 90-110 <br /> MS mg/L 5.000 102% 87-120 <br /> (STK2332028-001) MSD mg/L 5.000 108% 87-120 <br /> MSRPD mg/L 10.00 5.6% 5_16 <br /> MS mg/L 5.000 101 % 87-120 <br /> (SP 2302484-013) MSD mg/L 5.000 108% 87-120 <br /> MSRPD mg/L 10.00 6.6% 5516 <br /> Sulfate 300.0 02/21/2023:202213LDM Blank mg/L ND <0.5 <br /> LCS mg/L 50.00 108% 90-110 <br /> MS mg/L 100.0 103% 82-124 <br /> (STK2332028-001) MSD mg/L 100.0 108% 82-124 <br /> MSRPD mg/L 10.00 4.3% :523 <br /> MS mg/L 100.0 50.2% <'/a <br /> (SP 2302484-013) MSD mg/L 100.0 47.0% <'A <br /> MSRPD mg/L 10.00 0.7% 5_23 <br /> Nitrate 4500NO3F 02/14/2023:201644LFS Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 96.1% 80-120 <br /> MS mg/L 5.609 94.5% 66-125 <br /> (STK2332046-001) MSD mg/L 5.609 96.5% 66-125 <br /> MSRPD mg/L 5.609 0.9% :530.4 <br /> Nitrate+Nitrite as N 4500NO3F 02/14/2023:201644LFS Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 96.1% 80-120 <br /> MS mg/L 5.609 94.5% 66-125 <br /> (STK2332046-001) MSD mg/L 5.609 96.5% 66-125 <br /> MSRPD mg/L 5.609 0.9% :530.4 <br /> Nitrate Nitrogen 4500NO3F 02/14/2023:201644LFS Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 96.1% 80-120 <br /> MS mg/L 5.609 94.5% 66-125 <br /> (STK2332046-001) MSD mg/L 5.609 96.5% 66-125 <br /> MSRPD mg/L 5.609 0.9% :530.4 <br /> Nitrite as Nitrogen 4500NO3F 02/14/2023:201645LFS Blank mg/L ND <0.2 <br /> LCS mg/L 1.218 101% 80-120 <br /> MS mg/L 0.6090 101% 50-150 <br /> (STK2332046-001) MSD mg/L 0.6090 103% 50-150 <br /> Page 6 of 7 Page 6 of 7 <br />