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November 12, 2025 <br /> Lab No. : STK2556501 <br /> San Joaquin County EHD <br /> Customer No. : 3017919 <br /> Quality Control -Wet Chem <br /> MMIM <br /> Wet Chem <br /> Alkalinity(as CaCO3) 2320B (VI 2547515-009) Dup mg/L 0.2% 10 <br /> Bicarbonate 2320B (VI 2547515-009) Dup mg/L 0.2% 10 <br /> Carbonate 2320B (VI 2547515-009) Dup mg/L 0% 10 <br /> E.C. 2320B (VI 2547515-009) Dup umhos/cm 0.7% 5 <br /> Hydroxide 2320B (VI 2547515-009) Dup mg/L 0% 10 <br /> Solids,Total Dissolved 2540CE 10/30/2025:212159CTL Blank mg/L ND <20 <br /> LCS mg/L 991.1 101% 90-110 <br /> (SP 2518562-001) Dup mg/L 1.33% 5 <br /> (SP 2518562-001) Dup mg/L 3.56% 5 <br /> Chloride 300.0 11/03/2025:212352LDM Blank mg/L ND <1 <br /> LCS mg/L 25.00 104% 90-110 <br /> MS mg/L 50.00 101% 67-117 <br /> (VI 2547634-001) MSD mg/L 50.00 101% 67-117 <br /> MSRPD mg/L 0.0% <_7 <br /> MS mg/L 50.00 101% 67-117 <br /> (STK2556618-001) MSD mg/L 50.00 102% 67-117 <br /> MSRPD mg/L 0.1% :57 <br /> Fluoride 300.0 11/03/2025:212352LDM 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 /> (VI 2547634-001) MSD mg/L 5.000 102% 89-111 <br /> MSRPD mg/L 0.1% :59 <br /> MS mg/L 5.000 102% 89-111 <br /> (STK2556618-001) MSD mg/L 5.000 102% 89-111 <br /> MSRPD mg/L 0.1% 159 <br /> Sulfate 300.0 11/03/2025:212352LDM Blank mg/L ND <0.5 <br /> LCS mg/L 50.00 104% 90-110 <br /> MS mg/L 100.0 101% 18-165 <br /> (VI 2547634-001) MSD mg/L 100.0 101% 18-165 <br /> MSRPD mg/L 0.0% <_7 <br /> MS mg/L 100.0 102% 18-165 <br /> (STK2556618-001) MSD mg/L 100.0 102% 18-165 <br /> MSRPD mg/L 0.1% :_7 <br /> Nitrate 450ONO3F 10/29/2025:212115MM1 Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 95.2% 80-120 <br /> MS mg/L 5.609 92.2% 66-125 <br /> (SP 2518468-004) MSD mg/L 5.609 94.0% 66-125 <br /> MSRPD mg/L 0.8% :530.4 <br /> Nitrate+Nitrite as N 450ONO3F 10/29/2025:212115MM1 Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 95.2% 80-120 <br /> MS mg/L 5.609 92.2% 66-125 <br /> (SP 2518468-004) MSD mg/L 5.609 94.0% 66-125 <br /> MSRPD mg/L 0.8% :530.4 <br /> Nitrate Nitrogen 450ONO3F 10/29/2025:212115MM1 Blank mg/L ND <0.4 <br /> LCS mg/L 11.22 95.2% 80-120 <br /> MS mg/L 5.609 92.2% 66-125 <br /> (SP 2518468-004) MSD mg/L 5.609 94.0% 66-125 <br /> MSRPD mg/L 0.8% :530.4 <br /> Nitrite as Nitrogen 450ONO3F 10/29/2025:212141MM1 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 />