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QUALITY CONTROL SUMMARYWG1998334 <br />Volatile Organic Compounds (GC/MS) by Method 8260B L1580356-01 <br />Method Blank (MB) <br />(MB) R3886812-3 02/01/23 21:19 <br /> MB Result MB Qualifier MB MDL MB RDL <br />Analyte ug/l ug/l ug/l <br />Ethylbenzene U 0.137 1.00 <br />Toluene U 0.278 1.00 <br />1,2,4-Trimethylbenzene U 0.322 1.00 <br />1,3,5-Trimethylbenzene U 0.104 1.00 <br />Xylenes, Total U 0.174 3.00 <br />Ethanol U 42.0 100 <br /> (S) Toluene-d8 110 80.0-120 <br /> (S) 4-Bromofluorobenzene 104 77.0-126 <br /> (S) 1,2-Dichloroethane-d4 93.7 70.0-130 <br />Laboratory Control Sample (LCS) • Laboratory Control Sample Duplicate (LCSD) <br />(LCS) R3886812-1 02/01/23 19:34 • (LCSD) R3886812-2 02/01/23 19:55 <br /> Spike Amount LCS Result LCSD Result LCS Rec.LCSD Rec.Rec. Limits LCS Qualifier LCSD Qualifier RPD RPD Limits <br />Analyte ug/l ug/l ug/l %%%%% <br />Ethylbenzene 5.00 4.66 4.96 93.2 99.2 79.0-123 6.24 20 <br />Toluene 5.00 4.85 4.98 97.0 99.6 79.0-120 2.64 20 <br />1,2,4-Trimethylbenzene 5.00 4.24 4.33 84.8 86.6 76.0-121 2.10 20 <br />1,3,5-Trimethylbenzene 5.00 4.12 4.20 82.4 84.0 76.0-122 1.92 20 <br />Xylenes, Total 15.0 15.0 14.9 100 99.3 79.0-123 0.669 20 <br />ethanol 250 137 149 54.8 59.6 10.0-160 8.39 30 <br /> (S) Toluene-d8 107 103 80.0-120 <br /> (S) 4-Bromofluorobenzene 100 96.5 77.0-126 <br /> (S) 1,2-Dichloroethane-d4 94.8 95.2 70.0-130 <br />1 Cp <br />2 Tc <br />3 Ss <br />4 Cn <br />5 Sr <br />6 Qc <br />7 Gl <br />8 Al <br />9 Sc <br />ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: <br />711 Stantec - San Diego, CA 185851132 L1580356 02/10/23 07:56 37 of 44 <br />ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: <br />711 Stantec - San Diego, CA 185851132 L1580356 02/10/23 10:37 37 of 44