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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 />Method Blank (MB) <br />(MB) R3887797-2 02/02/23 17:03 <br /> MB Result MB Qualifier MB MDL MB RDL <br />Analyte mg/kg mg/kg mg/kg <br />p-Isopropyltoluene U 0.000204 0.00100 <br />2-Butanone (MEK)U 0.00468 0.0100 <br />Methylene Chloride U 0.00100 0.00500 <br />4-Methyl-2-pentanone (MIBK)U 0.000950 0.0100 <br />Naphthalene U 0.00498 0.00500 <br />n-Propylbenzene U 0.000206 0.00100 <br />Styrene U 0.000223 0.00100 <br />1,1,1,2-Tetrachloroethane U 0.000296 0.00100 <br />1,1,2,2-Tetrachloroethane U 0.000231 0.00100 <br />1,1,2-Trichlorotrifluoroethane U 0.000426 0.00100 <br />Tetrachloroethene U 0.000325 0.00100 <br />Toluene U 0.00123 0.00500 <br />1,2,3-Trichlorobenzene U 0.000306 0.00100 <br />1,2,4-Trichlorobenzene U 0.000388 0.00100 <br />1,1,1-Trichloroethane U 0.000370 0.00100 <br />1,1,2-Trichloroethane U 0.000425 0.00100 <br />Trichloroethene U 0.000200 0.00100 <br />Trichlorofluoromethane U 0.000356 0.00500 <br />1,2,3-Trichloropropane U 0.000244 0.00250 <br />1,2,4-Trimethylbenzene U 0.000211 0.00100 <br />1,2,3-Trimethylbenzene U 0.000287 0.00100 <br />1,3,5-Trimethylbenzene U 0.000266 0.00100 <br />Vinyl chloride U 0.000226 0.00100 <br />Xylenes, Total U 0.000500 0.00300 <br />Di-isopropyl ether U 0.000221 0.00100 <br />Ethanol U 0.0490 0.100 <br />Ethyl tert-butyl ether U 0.000250 0.00100 <br />Methyl tert-butyl ether U 0.000350 0.00100 <br />tert-Butyl alcohol U 0.00250 0.00500 <br />tert-Amyl Methyl Ether U 0.000400 0.00100 <br /> (S) Toluene-d8 106 75.0-131 <br /> (S) 4-Bromofluorobenzene 98.1 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 L1580356 02/10/23 07:56 39 of 44 <br />ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: <br />711 Stantec - San Diego, CA 185851132 L1580356 02/10/23 10:37 39 of 44