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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 />Acetone U 0.0207 0.0500 <br />Acrylonitrile U 0.00202 0.0100 <br />Benzene U 0.000375 0.00100 <br />Bromobenzene U 0.000275 0.00100 <br />Bromodichloromethane U 0.000725 0.00100 <br />Bromoform U 0.000424 0.00100 <br />Bromomethane U 0.00117 0.00500 <br />n-Butylbenzene U 0.000258 0.00100 <br />sec-Butylbenzene U 0.000201 0.00100 <br />tert-Butylbenzene U 0.000206 0.00100 <br />Carbon tetrachloride U 0.000248 0.00100 <br />Carbon disulfide U 0.000700 0.00100 <br />Chlorobenzene U 0.000192 0.00100 <br />Chlorodibromomethane U 0.000224 0.00100 <br />Chloroethane U 0.00100 0.00500 <br />Chloroform U 0.00103 0.00500 <br />Chloromethane U 0.000650 0.00250 <br />2-Chlorotoluene U 0.000225 0.00100 <br />4-Chlorotoluene U 0.000691 0.00100 <br />1,2-Dibromo-3-Chloropropane U 0.00190 0.00500 <br />1,2-Dibromoethane U 0.000250 0.00100 <br />Dibromomethane U 0.000350 0.00100 <br />1,2-Dichlorobenzene U 0.000425 0.00100 <br />1,3-Dichlorobenzene U 0.000600 0.00100 <br />1,4-Dichlorobenzene U 0.000830 0.00100 <br />Dichlorodifluoromethane U 0.000287 0.00500 <br />1,1-Dichloroethane U 0.000268 0.00100 <br />1,2-Dichloroethane U 0.000450 0.00100 <br />1,1-Dichloroethene U 0.000355 0.00100 <br />cis-1,2-Dichloroethene U 0.000475 0.00100 <br />trans-1,2-Dichloroethene U 0.000500 0.00100 <br />1,2-Dichloropropane U 0.000164 0.00100 <br />1,1-Dichloropropene U 0.000375 0.00100 <br />1,3-Dichloropropane U 0.000225 0.00100 <br />cis-1,3-Dichloropropene U 0.000425 0.00100 <br />trans-1,3-Dichloropropene U 0.000675 0.00100 <br />2,2-Dichloropropane U 0.000375 0.00100 <br />Ethylbenzene U 0.000300 0.00100 <br />Hexachloro-1,3-butadiene U 0.000342 0.00100 <br />Isopropylbenzene U 0.000425 0.00100 <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 38 of 44 <br />ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: <br />711 Stantec - San Diego, CA 185851132 L1580356 02/10/23 10:37 38 of 44