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WG2044243 QUALITY CONTROL SUMMARY <br /> Volatile Organic Compounds (GC/MS) by Method 8260B 1-1606082-01,02 <br /> Laboratory Control Sample (LCS) <br /> (LCS)R3914753-1 04/18/2314:22 C p <br /> Spike Amount LCS Result LCS Rec. Rec.Limits LCS Qualifier <br /> z <br /> Analyte mg/kg mg/kg % % TC <br /> p-Isopropyltoluene 0.0250 0.0251 100 72.0-133 <br /> 2-Butanone(MEK) 0.125 0.116 92.8 30.0-160 FS <br /> Methylene Chloride 0.0250 0.0217 86.8 68.0-123 <br /> 4-Methyl-2-pentanone(MIBK) 0.125 0.139 111 56.0-143 FCn]Naphthalene 0.0250 0.0251 100 59.0-130 <br /> n-Propylbenzene 0.0250 0.0241 96.4 74.0-126 <br /> Styrene 0.0250 0.0257 103 72.0-127 Fr <br /> 1,1,1,2-Tetrachloroethane 0.0250 0.0273 109 74.0-129 <br /> 1,1,2,2-Tetrachloroethane 0.0250 0.0263 105 68.0-128 <br /> 1,1,2-Trichlorotrifluoroethane 0.0250 0.0219 87.6 61.0-139 <br /> Tetrachloroethene 0.0250 0.0242 96.8 70.0-136 <br /> Toluene 0.0250 0.0243 97.2 75.0-121 FG <br /> 1,2,3-Trichlorobenzene 0.0250 0.0263 105 59.0-139 <br /> 1,2,4-Trichlorobenzene 0.0250 0.0265 106 62.0-137 <br /> 1,1,1-Trichloroethane 0.0250 0.0237 94.8 69.0-126 gAl <br /> 1,1,2-Trichloroethane 0.0250 0.0271 108 78.0-123 <br /> Trichloroethene 0.0250 0.0244 97.6 76.0-126 FC <br /> Trichlorofluoromethane 0.0250 0.0244 97.6 61.0-142 <br /> 1,2,3-Trichloropropane 0.0250 0.0252 101 67.0-129 <br /> 1,2,4-Trimethylbenzene 0.0250 0.0237 94.8 70.0-126 <br /> 1,2,3-Trimethyl benzene 0.0250 0.0253 101 66.0-132 <br /> 1,3,5-Trimethyl benzene 0.0250 0.0246 98.4 73.0-127 <br /> Vinyl chloride 0.0250 0.0222 88.8 63.0-134 <br /> Xylenes,Total 0.0750 0.0750 100 72.0-127 <br /> Di-isopropyl ether 0.0250 0.0239 95.6 60.0-136 <br /> ethanol 1.25 1.39 111 10.0-160 <br /> Ethyl tert-butyl ether 0.0250 0.0250 100 68.0-140 <br /> Methyl tert-butyl ether 0.0250 0.0240 96.0 66.0-132 <br /> t-Amyl Alcohol 0.125 0.122 97.6 26.0-160 <br /> tert-Butyl alcohol 0.125 0.142 114 15.0-160 <br /> tert-Amyl Methyl Ether 0.0250 0.0244 97.6 66.0-135 <br /> (S)Toluene-d8 110 75.0-131 <br /> (S)4-Bromofluorobenzene 108 670-138 <br /> (S)1,2-Dichloroethone-d4 99.6 70.0-130 <br /> ACCOUNT: PROJECT: SDG: DATE/TIME: PAGE: <br /> Antea-Rancho Cordova ARCO 2093 L1606082 04/21/2314:00 23 of 34 <br />