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QUALITY CONTROL SUMMARYWG1998045 <br />Volatile Organic Compounds (GC/MS) by Method 8260B L1580356-01 <br />Method Blank (MB) <br />(MB) R3886498-3 02/01/23 10:45 <br /> MB Result MB Qualifier MB MDL MB RDL <br />Analyte ug/l ug/l ug/l <br />Acetone U 11.3 50.0 <br />Acrylonitrile U 0.671 10.0 <br />Benzene U 0.0941 1.00 <br />Bromobenzene U 0.118 1.00 <br />Bromochloromethane U 0.128 1.00 <br />Bromodichloromethane U 0.136 1.00 <br />Bromoform U 0.129 1.00 <br />Bromomethane U 0.605 5.00 <br />n-Butylbenzene U 0.157 1.00 <br />sec-Butylbenzene U 0.125 1.00 <br />tert-Butylbenzene U 0.127 1.00 <br />Carbon tetrachloride U 0.128 1.00 <br />Carbon disulfide 0.215 J 0.0962 1.00 <br />Chlorobenzene U 0.116 1.00 <br />Chlorodibromomethane U 0.140 1.00 <br />Chloroethane U 0.192 5.00 <br />Chloroform U 0.111 5.00 <br />Chloromethane U 0.960 2.50 <br />1,2-Dibromo-3-Chloropropane U 0.276 5.00 <br />1,2-Dibromoethane U 0.126 1.00 <br />Dibromomethane U 0.122 1.00 <br />1,2-Dichlorobenzene U 0.107 1.00 <br />1,3-Dichlorobenzene U 0.110 1.00 <br />1,4-Dichlorobenzene U 0.120 1.00 <br />trans-1,4-Dichloro-2-butene U 0.467 2.50 <br />Dichlorodifluoromethane U 0.374 5.00 <br />1,1-Dichloroethane U 0.100 1.00 <br />1,2-Dichloroethane U 0.0819 1.00 <br />1,1-Dichloroethene U 0.188 1.00 <br />cis-1,2-Dichloroethene U 0.126 1.00 <br />trans-1,2-Dichloroethene U 0.149 1.00 <br />1,2-Dichloropropane U 0.149 1.00 <br />cis-1,3-Dichloropropene U 0.111 1.00 <br />trans-1,3-Dichloropropene U 0.118 1.00 <br />Hexachloro-1,3-butadiene U 0.337 1.00 <br />2-Hexanone U 0.787 10.0 <br />2-Butanone (MEK)U 1.19 10.0 <br />Iodomethane U 6.00 10.0 <br />Methylene Chloride U 0.430 5.00 <br />4-Methyl-2-pentanone (MIBK)U 0.478 10.0 <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 33 of 44 <br />ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: <br />711 Stantec - San Diego, CA 185851132 L1580356 02/10/23 10:37 33 of 44