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QUALITY CONTROL SUMMARYWG1998045 <br />Volatile Organic Compounds (GC/MS) by Method 8260B L1580356-01 <br />Laboratory Control Sample (LCS) • Laboratory Control Sample Duplicate (LCSD) <br />(LCS) R3886498-1 02/01/23 08:59 • (LCSD) R3886498-2 02/01/23 09:20 <br /> Spike Amount LCS Result LCSD Result LCS Rec.LCSD Rec.Rec. Limits LCS Qualifier LCSD Qualifier RPD RPD Limits <br />Analyte ug/l ug/l ug/l %%%%% <br />Trichloroethene 5.00 5.34 5.09 107 102 78.0-124 4.79 20 <br />Trichlorofluoromethane 5.00 5.10 5.00 102 100 59.0-147 1.98 20 <br />1,2,3-Trichloropropane 5.00 3.81 3.44 76.2 68.8 73.0-130 J4 10.2 20 <br />Vinyl acetate 25.0 23.1 22.2 92.4 88.8 11.0-160 3.97 20 <br />Vinyl chloride 5.00 4.52 4.43 90.4 88.6 67.0-131 2.01 20 <br />Di-isopropyl ether 5.00 4.50 4.41 90.0 88.2 58.0-138 2.02 20 <br />Ethyl tert-butyl ether 5.00 4.69 4.49 93.8 89.8 63.0-138 4.36 20 <br />Methyl tert-butyl ether 5.00 5.34 5.17 107 103 68.0-125 3.24 20 <br />tert-Butyl alcohol 25.0 16.4 16.7 65.6 66.8 27.0-160 1.81 30 <br />tert-Amyl Methyl Ether 5.00 4.94 4.91 98.8 98.2 66.0-125 0.609 20 <br /> (S) Toluene-d8 103 101 80.0-120 <br /> (S) 4-Bromofluorobenzene 99.4 98.4 77.0-126 <br /> (S) 1,2-Dichloroethane-d4 101 103 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 36 of 44 <br />ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: <br />711 Stantec - San Diego, CA 185851132 L1580356 02/10/23 10:37 36 of 44