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April 21, 2023 <br /> Lab No. : STK2334318 <br /> San Joaquin County EHD <br /> Customer No. : 3017919 <br /> Quality Control -Wet Chem <br /> Wet Chem <br /> Alkalinity(as CaCO3) 2320B 04/16/2023:204032AMM ND mg/L 0.07% 10 <br /> Bicarbonate 2320B (SP 2305402-010) Dup mg/L 0.05% 10 <br /> E.C. 2320B (SP 2305402-010) Dup umhos/cm 0.1% 5 <br /> Solids,Total Dissolved 2540CE 04/12/2023:203883CTL Blank mg/L ND <20 <br /> LCS mg/L 993.4 101% 90-110 <br /> (SP 2305246-001) Dup mg/L 2.63% 5 <br /> (SP 2305246-001) Dup mg/L 0.5% 5 <br /> Chloride 300.0 04/11/2023:203852LDM Blank mg/L ND <1 <br /> LCS mg/L 25.00 100% 90-110 <br /> MS mg/L 50.00 98.1 % 85-121 <br /> (VI 2342105-001) MSD mg/L 50.00 102% 85-121 <br /> MSRPD mg/L 10.00 3.4% 5519 <br /> MS mg/L 50.00 84.8% 85-121 <br /> (CH 2372278-001) MSD mg/L 50.00 81.1 % 85-121 435 <br /> MSRPD mg/L 10.00 1.8% 5519 <br /> Fluoride 300.0 04/11/2023:203852LDM Blank mg/L ND <0.1 <br /> LCS mg/L 2.500 99.7% 90-110 <br /> MS mg/L 5.000 102% 87-120 <br /> (VI 2342105-001) MSD mg/L 5.000 107% 87-120 <br /> MSRPD mg/L 10.00 5.2% 5_16 <br /> MS mg/L 5.000 105% 87-120 <br /> (CH 2372278-001) MSD mg/L 5.000 101 % 87-120 <br /> MSRPD mg/L 10.00 4.3% .516 <br /> Nitrate 300.0 04/11/2023:203852LDM Blank mg/L ND <0.4 <br /> LCS mg/L 20.00 100% 90-110 <br /> MS mg/L 40.00 98.2% 85-119 <br /> (VI 2342105-001) MSD mg/L 40.00 103% 85-119 <br /> MSRPD mg/L 10.00 3.3% :519 <br /> MS mg/L 40.00 105% 85-119 <br /> (CH 2372278-001) MSD mg/L 40.00 101 % 85-119 <br /> MSRPD mg/L 10.00 4.2% 5519 <br /> Nitrate+Nitrite as N 300.0 04/11/2023:203852LDM Blank mg/L ND <0.4 <br /> LCS mg/L 20.00 100% 90-110 <br /> MS mg/L 40.00 98.2% 85-119 <br /> (VI 2342105-001) MSD mg/L 40.00 103% 85-119 <br /> MSRPD mg/L 10.00 3.3% :519 <br /> MS mg/L 40.00 105% 85-119 <br /> (CH 2372278-001) MSD mg/L 40.00 101 % 85-119 <br /> MSRPD mg/L 10.00 4.2% :519 <br /> Nitrate Nitrogen 300.0 04/11/2023:203852LDM Blank mg/L ND <0.4 <br /> LCS mg/L 20.00 100% 90-110 <br /> MS mg/L 40.00 98.2% 85-119 <br /> (VI 2342105-001) MSD mg/L 40.00 103% 85-119 <br /> MSRPD mg/L 10.00 3.3% :519 <br /> MS mg/L 40.00 105% 85-119 <br /> (CH 2372278-001) MSD mg/L 40.00 101 % 85-119 <br /> MSRPD mg/L 10.00 4.2% :519 <br /> Nitrite as Nitrogen 300.0 04/11/2023:203852LDM Blank mg/L ND <0.4 <br /> LCS mg/L 15.00 99.7% 90-110 <br /> MS mg/L 30.00 102% 74-126 <br /> Page 7 of 8 Page 7 of 8 <br />