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March 7, 2024 <br /> Lab No. : STK2432129 <br /> San Joaquin County EHD <br /> Customer No. : 3017919 <br /> Quality Control -Wet Chem <br /> Wet Chem <br /> Alkalinity(as CaCO3) 2320B (CH 2471032-009) Dup mg/L 0.1% 10 <br /> Bicarbonate 2320B (CH 2471032-009) Dup mg/L 0.1% 10 <br /> Carbonate 2320B (CH 2471032-009) Dup mg/L 0% 10 <br /> E.C. 2320B (CH 2471032-009) Dup umhos/cm 0.3% 5 <br /> Hydroxide 2320B (CH 2471032-009) Dup mg/L 0% 10 <br /> Solids,Total Dissolved 2540CE 02/13/2024:201691CTL Blank mg/L ND <20 <br /> LCS mg/L 992.0 99.6% 90-110 <br /> (SP 2401977-001) Dup mg/L 3.06% 5 <br /> (SP 2401977-001) Dup mg/L 0.4% 5 <br /> Chloride 300.0 02/16/2024:201915LDM Blank mg/L ND <1 <br /> LCS mg/L 25.00 97.5% 90-110 <br /> MS mg/L 50.00 98.9% 67-117 <br /> (STK2431788-003) MSD mg/L 50.00 99.3% 67-117 <br /> MSRPD mg/L 0.4% :57 <br /> MS mg/L 50.00 97.6% 67-117 <br /> (CH 2471032-013) MSD mg/L 50.00 97.6% 67-117 <br /> MSRPD mg/L 0.0% !_7 <br /> Fluoride 300.0 02/16/2024:201915LDM Blank mg/L ND <0.1 <br /> LCS mg/L 2.500 98.0% 90-110 <br /> MS mg/L 5.000 102% 89-111 <br /> (STK2431788-003) MSD mg/L 5.000 101% 89-111 <br /> MSRPD mg/L 0.1% :59 <br /> MS mg/L 5.000 103% 89-111 <br /> (CH 2471032-013) MSD mg/L 5.000 103% 89-111 <br /> MSRPD mg/L 0.1% :59 <br /> Sulfate 300.0 02/16/2024:201915LDM Blank mg/L ND <0.5 <br /> LCS mg/L 50.00 98.7% 90-110 <br /> MS mg/L 100.0 99.9% 18-165 <br /> (STK2431788-003) MSD mg/L 100.0 100% 18-165 <br /> MSRPD mg/L 0.5% :57 <br /> MS mg/L 100.0 102% 18-165 <br /> (CH 2471032-013) MSD mg/L 100.0 102% 18-165 <br /> MSRPD mg/L 0.0% :57 <br /> Nitrate 4500NO3F 02/13/2024:201690ILP Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 98.6% 80-120 <br /> MS mg/L 5.609 97.6% 66-125 <br /> (SP 2402071-001) MSD mg/L 5.609 96.4% 66-125 <br /> MSRPD mg/L 0.7% :530.4 <br /> Nitrate+Nitrite as N 4500NO3F 02/13/2024:201690ILP Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 98.6% 80-120 <br /> MS mg/L 5.609 97.6% 66-125 <br /> (SP 2402071-001) MSD mg/L 5.609 96.4% 66-125 <br /> MSRPD mg/L 0.7% :530.4 <br /> Nitrate Nitrogen 4500NO3F 02/13/2024:201690ILP Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 98.6% 80-120 <br /> MS mg/L 5.609 97.6% 66-125 <br /> (SP 2402071-001) MSD mg/L 5.609 96.4% 66-125 <br /> MSRPD mg/L 0.7% 1530.4 <br /> Nitrite as Nitrogen 4500NO3F 02/13/2024:201707ILP Blank mg/L ND <0.2 <br /> LCS mg/L 1.218 104% 80-120 <br /> Page 7 of 8 Page 7 of 8 <br />