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QUALITY CONTROL SUMMARYWG1998174 <br />Volatile Organic Compounds (GC/MS) by Method 8260B L1580356-02,03,04,05,06,07,08,09,10 <br />Laboratory Control Sample (LCS) <br />(LCS) R3887797-1 02/02/23 16:15 <br /> Spike Amount LCS Result LCS Rec.Rec. Limits LCS Qualifier <br />Analyte mg/kg mg/kg %% <br />p-Isopropyltoluene 0.0250 0.0273 109 72.0-133 <br />2-Butanone (MEK)0.125 0.0958 76.6 30.0-160 <br />Methylene Chloride 0.0250 0.0267 107 68.0-123 <br />4-Methyl-2-pentanone (MIBK)0.125 0.104 83.2 56.0-143 <br />Naphthalene 0.0250 0.0225 90.0 59.0-130 <br />n-Propylbenzene 0.0250 0.0257 103 74.0-126 <br />Styrene 0.0250 0.0267 107 72.0-127 <br />1,1,1,2-Tetrachloroethane 0.0250 0.0235 94.0 74.0-129 <br />1,1,2,2-Tetrachloroethane 0.0250 0.0227 90.8 68.0-128 <br />1,1,2-Trichlorotrifluoroethane 0.0250 0.0257 103 61.0-139 <br />Tetrachloroethene 0.0250 0.0248 99.2 70.0-136 <br />Toluene 0.0250 0.0243 97.2 75.0-121 <br />1,2,3-Trichlorobenzene 0.0250 0.0244 97.6 59.0-139 <br />1,2,4-Trichlorobenzene 0.0250 0.0252 101 62.0-137 <br />1,1,1-Trichloroethane 0.0250 0.0247 98.8 69.0-126 <br />1,1,2-Trichloroethane 0.0250 0.0240 96.0 78.0-123 <br />Trichloroethene 0.0250 0.0253 101 76.0-126 <br />Trichlorofluoromethane 0.0250 0.0232 92.8 61.0-142 <br />1,2,3-Trichloropropane 0.0250 0.0230 92.0 67.0-129 <br />1,2,4-Trimethylbenzene 0.0250 0.0267 107 70.0-126 <br />1,2,3-Trimethylbenzene 0.0250 0.0252 101 66.0-132 <br />1,3,5-Trimethylbenzene 0.0250 0.0268 107 73.0-127 <br />Vinyl chloride 0.0250 0.0225 90.0 63.0-134 <br />Xylenes, Total 0.0750 0.0797 106 72.0-127 <br />Di-isopropyl ether 0.0250 0.0230 92.0 60.0-136 <br />ethanol 1.25 1.12 89.6 10.0-160 <br />Ethyl tert-butyl ether 0.0250 0.0241 96.4 68.0-140 <br />Methyl tert-butyl ether 0.0250 0.0255 102 66.0-132 <br />tert-Butyl alcohol 0.125 0.130 104 15.0-160 <br />tert-Amyl Methyl Ether 0.0250 0.0263 105 66.0-135 <br /> (S) Toluene-d8 104 75.0-131 <br /> (S) 4-Bromofluorobenzene 102 67.0-138 <br /> (S) 1,2-Dichloroethane-d4 98.8 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 L1580356 02/10/23 07:56 41 of 44 <br />ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: <br />711 Stantec - San Diego, CA 185851132 L1580356 02/10/23 10:37 41 of 44