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WG2598274 QUALITY CONTROL SUMMARY <br /> Wet Chemistry by Method 9034-9030B L1895603-02 <br /> Method Blank (MB) <br /> (MB)R4271666-1 09/10/25 23:01 C p <br /> MB Result MB Qualifier MB MDL MB RDL PC <br /> Analyte mg/kg mg/kg mg/kg <br /> Reactive Sulfide U 28.1 75.0 <br /> 3 <br /> qS <br /> Laboratory Control Sample (LCS) <br /> (LCS)R4271666-2 09/10/25 23:01 Rn <br /> Spike Amount LCS Result LCS Rec. Rec.Limits LCS Qualifier <br /> s <br /> Analyte mg/kg mg/kg % % Sr <br /> Reactive Sulfide 100 89.1 89.1 53.8-124 <br /> L1895441-01 Original Sample (OS) • Matrix Spike (MS) • Matrix Spike Duplicate (MSD) <br /> (OS)L1895441-01 09/10/25 23:01•(MS)R4271666-3 09/10/25 23:01•(MSD)R4271666-4 09/10/25 23:01 7Gl <br /> Spike Amount Original Result MS Result MSD Result MS Rec. MSD Rec. Dilution Rec.Limits MS Qualifier MSD Qualifier RPD RPD Limits <br /> Analyte mg/kg mg/kg mg/kg mg/kg % % % % % $Al <br /> Reactive Sulfide 100 ND 87.5 85.8 87.5 85.8 1 10.0-136 1.99 20 <br /> Fc <br /> ACCOUNT: PROJECT: SDG: DATE/TIME: PAGE: <br /> UniFirst Corporation-Wilmington,MA UNIFIRST 370-CA L1895603 09/23/25 10:16 16 of 53 <br />