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February 9, 2024 <br /> Lab No. : STK2431581 <br /> San Joaquin County EHD <br /> Customer No. : 3017919 <br /> Quality Control -Wet Chem <br /> Wet Chem <br /> Alkalinity(as CaCO3) 2320B (VI 2440787-007) Dup mg/L 2.66% 10 <br /> Bicarbonate 2320B (VI 2440787-007) Dup mg/L 2.70% 10 <br /> E.C. 2320B (VI 2440787-007) Dup umhos/cm 0.3% 5 <br /> Solids,Total Dissolved 2540CE 02/05/2024:201355CTL Blank mg/L ND <20 <br /> LCS mg/L 992.0 103% 90-110 <br /> (STK2431560-001) Dup mg/L 2.65% 5 <br /> (STK2431560-001) Dup mg/L 1.52% 5 <br /> Chloride 300.0 02/02/2024:201350LDM Blank mg/L ND <1 <br /> LCS mg/L 25.00 102% 90-110 <br /> MS mg/L 50.00 98.2% 67-117 <br /> (STK2431581-001) MSD mg/L 50.00 389% 67-117 435 <br /> MSRPD mg/L 107.0% <_7 435 <br /> MS mg/L 50.00 35.3% 67-117 435 <br /> (SP 2401622-001) MSD mg/L 50.00 91.4% 67-117 <br /> MSRPD mg/L 41.4% :57 435 <br /> Fluoride 300.0 02/02/2024:201350LDM Blank mg/L ND <0.1 <br /> LCS mg/L 2.500 101% 90-110 <br /> MS mg/L 5.000 104% 89-111 <br /> (STK2431581-001) MSD mg/L 5.000 549% 89-111 435 <br /> MSRPD mg/L 135.6% :59 435 <br /> MS mg/L 5.000 544% 89-111 435 <br /> (SP 2401622-001) MSD mg/L 5.000 103% 89-111 <br /> MSRPD mg/L 131.0% :59 435 <br /> Nitrate 300.0 02/02/2024:201350LDM Blank mg/L ND <0.4 <br /> LCS mg/L 20.00 98.8% 90-110 <br /> MS mg/L 40.00 99.7% 86-112 <br /> (STK2431581-001) MSD mg/L 40.00 612% 86-112 435 <br /> MSRPD mg/L 135.1% :57 435 <br /> MS mg/L 40.00 633% 86-112 435 <br /> (SP 2401622-001) MSD mg/L 40.00 101% 86-112 <br /> MSRPD mg/L 143.4% <_7 435 <br /> Nitrate+Nitrite as N 300.0 02/02/2024:201350LDM Blank mg/L ND <0.4 <br /> LCS mg/L 20.00 98.8% 90-110 <br /> MS mg/L 40.00 99.7% 86-112 <br /> (STK2431581-001) MSD mg/L 40.00 612% 86-112 435 <br /> MSRPD mg/L 135.1% :57 435 <br /> MS mg/L 40.00 633% 86-112 435 <br /> (SP 2401622-001) MSD mg/L 40.00 101% 86-112 <br /> MSRPD mg/L 143.4% <_7 435 <br /> Nitrate Nitrogen 300.0 02/02/2024:201350LDM Blank mg/L ND <0.4 <br /> LCS mg/L 20.00 98.8% 90-110 <br /> MS mg/L 40.00 99.7% 86-112 <br /> (STK2431581-001) MSD mg/L 40.00 612% 86-112 435 <br /> MSRPD mg/L 135.1% :57 435 <br /> MS mg/L 40.00 633% 86-112 435 <br /> (SP 2401622-001) MSD mg/L 40.00 101% 86-112 <br /> MSRPD mg/L 143.4% :57 435 <br /> Nitrite as Nitrogen 300.0 02/02/2024:201350LDM Blank mg/L ND <0.4 <br /> LCS mg/L 15.00 102% 90-110 <br /> MS mg/L 30.00 104% 88-111 <br /> Page 6 of 7 Page 6 of 7 <br />