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July 9, 2024 <br /> Lab No. : STK2439354 <br /> San Joaquin County EHD <br /> Customer No. : 3017919 <br /> Quality Control -Wet Chem <br /> Wet Chem <br /> Alkalinity(as CaCO3) 2320B (VI 2444906-001) Dup mg/L 2.56% 10 <br /> Bicarbonate 2320B (VI 2444906-001) Dup mg/L 3.16% 10 <br /> Carbonate 2320B (VI 2444906-001) Dup mg/L 3.92% 10 <br /> E.C. 2320B (VI 2444906-001) Dup umhos/cm 0.6% 5 <br /> Hydroxide 2320B (VI 2444906-001) Dup mg/L 3.92% 10 <br /> Solids,Total Dissolved 2540CE 06/26/2024:207085CTL Blank mg/L ND <20 <br /> LCS mg/L 990.5 99.0% 90-110 <br /> (SP 2410361-003) Dup mg/L 1.06% 5 <br /> (SP 2410361-003) Dup mg/L 0.1% 5 <br /> Chloride 300.0 07/05/2024:207450LDM Blank mg/L ND <1 <br /> LCS mg/L 25.00 105% 90-110 <br /> MS mg/L 50.00 102% 67-117 <br /> (CH 2475595-002) MSD mg/L 50.00 102% 67-117 <br /> MSRPD mg/L 0.1% :57 <br /> MS mg/L 50.00 95.4% 67-117 <br /> (CH 2475595-005) MSD mg/L 50.00 95.5% 67-117 <br /> MSRPD mg/L 0.0% !_7 <br /> Fluoride 300.0 07/05/2024:207450LDM Blank mg/L ND <0.1 <br /> LCS mg/L 2.500 102% 90-110 <br /> MS mg/L 5.000 102% 89-111 <br /> (CH 2475595-002) MSD mg/L 5.000 99.9% 89-111 <br /> MSRPD mg/L 1.9% :59 <br /> MS mg/L 5.000 103% 89-111 <br /> (CH 2475595-005) MSD mg/L 5.000 101% 89-111 <br /> MSRPD mg/L 1.9% :59 <br /> Sulfate 300.0 07/05/2024:207450LDM Blank mg/L ND <0.5 <br /> LCS mg/L 50.00 105% 90-110 <br /> MS mg/L 100.0 101% 18-165 <br /> (CH 2475595-002) MSD mg/L 100.0 101% 18-165 <br /> MSRPD mg/L 0.2% :57 <br /> MS mg/L 100.0 99.3% 18-165 <br /> (CH 2475595-005) MSD mg/L 100.0 99.4% 18-165 <br /> MSRPD mg/L 0.1% :57 <br /> Nitrate 4500NO3F 06/25/2024:207043LDM Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 98.8% 80-120 <br /> MS mg/L 5.609 97.3% 66-125 <br /> (SP 2410320-001) MSD mg/L 5.609 92.9% 66-125 <br /> MSRPD mg/L 2.2% :530.4 <br /> Nitrate+Nitrite as N 4500NO3F 06/25/2024:207043LDM Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 98.8% 80-120 <br /> MS mg/L 5.609 97.3% 66-125 <br /> (SP 2410320-001) MSD mg/L 5.609 92.9% 66-125 <br /> MSRPD mg/L 2.2% :530.4 <br /> Nitrate Nitrogen 4500NO3F 06/25/2024:207043LDM Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 98.8% 80-120 <br /> MS mg/L 5.609 97.3% 66-125 <br /> (SP 2410320-001) MSD mg/L 5.609 92.9% 66-125 <br /> MSRPD mg/L 2.2% 1530.4 <br /> Nitrite as Nitrogen 4500NO3F 06/25/2024:207044LDM Blank mg/L ND <0.2 <br /> LCS mg/L 1.218 104% 80-120 <br /> Page 6 of 7 Page 6 of 7 <br />