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August 6, 2021 Lab ID : STI(2139969 <br />San Joaquin Co. Environmental Health Dep Customer : 3-17919 <br />Quality Control - Inorganic <br />Constituent Method Date/1D Type Units Conc. QC Data DQO Note <br />Metals <br />Sodium 200.7 07/16/21:210902AC CCB ppm -0.09 I <br />Zinc 200.7 MS ug/L 800.0 111% 75-125 <br />(CC 2182463-002) MSD ug/L 800.0 111% 75-125 <br />MSRPD ug/L 4000 0.2% 2O.O <br />200.7 07/16/21:210902AC CCV ppm 1.000 106% 90-110 <br />CCB ppm 0.00009 0.02 <br />CCV ppm 1.000 106% 90-110 <br />CCB ppm 0.0007 0.02 <br />Wet Chem <br />Alkalinity (as CaCO3) 2320B (CC 2182474-001) Dup mg/L 0.08% 10 <br />2320B 07/26/21:211402AMM CCV mg/L 235.8 93.6% 90-110 <br />CCV mg/L 235.8 100% 90-110 <br />Bicarbonate 2320B (CC 2182474-001) Dup mg/L 0.09% 10 <br />Carbonate 2320B (CC 2182474-001) Dup mg/L 0.0 10 <br />Hydroxide 2320B (CC 2182474-001) Dup mg/L 0.0 10 <br />Conductivity 2510B 07/30/21:211662sta ICB umhos/cm 0.170 1 <br />CCV umhos/cm 973 95-105 <br />CCV umhos/cm 972 95-105 <br />F. C. 25108 07/30/21:208651sta Blank umhos/cm ND <1 <br />(SP 2109730-002) Dup umhos/cm 0.4% 5 <br />Total Dissolved Solids (TFR) 2540CE 07/19/21:208082CTL Blank mg/L ND <20 <br />LCS mg/L 992.1 104% 90-110 <br />(STK2139795-001) Dup mg/L 1.2% 5 <br />(STK2139795-001) Dup mg/L 1.3% 5 <br />Chloride 300.0 07/16/21:207998MCA Blank mg/L ND <1 <br />LCS mg/L 25.00 98.4% 90-110 <br />MS mg/L 50.00 88.2% 85-121 <br />(STK2139973-001) MSD mg/L 50.00 89.4% 85-121 <br />MSRPD mg/L 10.00 0.6% <19 <br />300.0 07/16/21:211044MCA CCB mg/L 0.09 1 <br />CCV mg/L 25.00 96.6% 90-110 <br />CCB mg/L 0.00 1 <br />CCV mg/L 25.00 96.6% 90-110 <br />Fluoride 300.0 07/16/21:207998MCA Blank mg/L ND <0.1 <br />LCS mg/L 2.500 98.4% 90-110 <br />MS mg/L 5.000 102% 87-120 <br />(STIC2139973-001) MSD mg/L 5.000 102% 87-120 <br />MSRPD mg/L 10.00 0.5% <16 <br />300.0 07/16/21:211044MCA CCB mg/L 0.000 0.1 <br />CCV mg/L 2.500 97.0% 90-110 <br />CCB mg/L 0.000 0.1 <br />CCV mg/L 2.500 96.8% 90-110 <br />Nitrate 300.0 07/16/21:207998MCA Blank mg/L ND <0.4 <br />LCS mg/L 20.00 98.4% 90-110 <br />MS mg/L 40.00 95.7% 85-119 <br />(STIC2139973-001) MSD mg/L 40.00 96.6% 85-119 <br />MSRPD mg/L 10.00 0.6% <19 <br />300.0 07/16/21:211044MCA CCB mg/L 0.000 0.5 <br />CCV mg/L 20.00 97.0% 90-110 <br />CCB mg/L 0.000 0.5 <br />CCV mg/L 20.00 96.7% 90-110 <br />Nitrate + Nitrite as N 300.0 07/16/21:207998MCA Blank mg/L ND <0.1 <br />Nitrate Nitrogen 300.0 07/16/21:207998MCA Blank mg/L ND <0.1 <br />Nitrite 300.0 07/16/21:207998MCA Blank mg/L ND <0.5 <br />Page 7 of 8