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QUALITY CONTROL SUMMARYWG2000287 <br />Volatile Organic Compounds (GC/MS) by Method 8260B L1581654-01,02,03,04,05 <br />Laboratory Control Sample (LCS) <br />(LCS) R3887900-1 02/04/23 15:05 <br /> Spike Amount LCS Result LCS Rec.Rec. Limits LCS Qualifier <br />Analyte mg/kg mg/kg %% <br />p-Isopropyltoluene 0.0250 0.0287 115 72.0-133 <br />2-Butanone (MEK)0.125 0.0929 74.3 30.0-160 <br />Methylene Chloride 0.0250 0.0257 103 68.0-123 <br />4-Methyl-2-pentanone (MIBK)0.125 0.102 81.6 56.0-143 <br />Naphthalene 0.0250 0.0235 94.0 59.0-130 <br />n-Propylbenzene 0.0250 0.0278 111 74.0-126 <br />Styrene 0.0250 0.0273 109 72.0-127 <br />1,1,1,2-Tetrachloroethane 0.0250 0.0239 95.6 74.0-129 <br />1,1,2,2-Tetrachloroethane 0.0250 0.0232 92.8 68.0-128 <br />1,1,2-Trichlorotrifluoroethane 0.0250 0.0253 101 61.0-139 <br />Tetrachloroethene 0.0250 0.0250 100 70.0-136 <br />Toluene 0.0250 0.0244 97.6 75.0-121 <br />1,2,3-Trichlorobenzene 0.0250 0.0256 102 59.0-139 <br />1,2,4-Trichlorobenzene 0.0250 0.0266 106 62.0-137 <br />1,1,1-Trichloroethane 0.0250 0.0243 97.2 69.0-126 <br />1,1,2-Trichloroethane 0.0250 0.0237 94.8 78.0-123 <br />Trichloroethene 0.0250 0.0249 99.6 76.0-126 <br />Trichlorofluoromethane 0.0250 0.0230 92.0 61.0-142 <br />1,2,3-Trichloropropane 0.0250 0.0238 95.2 67.0-129 <br />1,2,4-Trimethylbenzene 0.0250 0.0288 115 70.0-126 <br />1,2,3-Trimethylbenzene 0.0250 0.0270 108 66.0-132 <br />1,3,5-Trimethylbenzene 0.0250 0.0285 114 73.0-127 <br />Vinyl chloride 0.0250 0.0230 92.0 63.0-134 <br />Xylenes, Total 0.0750 0.0816 109 72.0-127 <br />Di-isopropyl ether 0.0250 0.0222 88.8 60.0-136 <br />ethanol 1.25 1.10 88.0 10.0-160 <br />Ethyl tert-butyl ether 0.0250 0.0240 96.0 68.0-140 <br />Methyl tert-butyl ether 0.0250 0.0244 97.6 66.0-132 <br />tert-Butyl alcohol 0.125 0.118 94.4 15.0-160 <br />tert-Amyl Methyl Ether 0.0250 0.0261 104 66.0-135 <br /> (S) Toluene-d8 105 75.0-131 <br /> (S) 4-Bromofluorobenzene 99.5 67.0-138 <br /> (S) 1,2-Dichloroethane-d4 97.8 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 185851132.1200.0400 L1581654 02/06/23 15:51 21 of 24 <br />ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: <br />711 Stantec - San Diego, CA 185851132.1200.0400 L1581654 02/06/23 16:41 21 of 24