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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 />tert-Butylbenzene 5.00 4.18 4.22 83.6 84.4 76.0-124 0.952 20 <br />Carbon tetrachloride 5.00 5.45 5.23 109 105 68.0-126 4.12 20 <br />Carbon disulfide 5.00 4.56 4.45 91.2 89.0 61.0-128 2.44 20 <br />Chlorobenzene 5.00 4.96 4.80 99.2 96.0 80.0-121 3.28 20 <br />Chlorodibromomethane 5.00 4.86 4.88 97.2 97.6 77.0-125 0.411 20 <br />Chloroethane 5.00 7.31 5.98 146 120 47.0-150 20.0 20 <br />Chloroform 5.00 5.22 4.90 104 98.0 73.0-120 6.32 20 <br />Chloromethane 5.00 4.40 4.16 88.0 83.2 41.0-142 5.61 20 <br />1,2-Dibromo-3-Chloropropane 5.00 2.93 2.92 58.6 58.4 58.0-134 0.342 20 <br />1,2-Dibromoethane 5.00 4.69 4.74 93.8 94.8 80.0-122 1.06 20 <br />Dibromomethane 5.00 4.73 4.98 94.6 99.6 80.0-120 5.15 20 <br />1,2-Dichlorobenzene 5.00 4.61 4.48 92.2 89.6 79.0-121 2.86 20 <br />1,3-Dichlorobenzene 5.00 4.55 4.41 91.0 88.2 79.0-120 3.13 20 <br />1,4-Dichlorobenzene 5.00 4.45 4.47 89.0 89.4 79.0-120 0.448 20 <br />trans-1,4-Dichloro-2-butene 5.00 2.99 3.27 59.8 65.4 33.0-144 8.95 20 <br />Dichlorodifluoromethane 5.00 5.16 5.08 103 102 51.0-149 1.56 20 <br />1,1-Dichloroethane 5.00 4.57 4.47 91.4 89.4 70.0-126 2.21 20 <br />1,2-Dichloroethane 5.00 5.06 4.91 101 98.2 70.0-128 3.01 20 <br />1,1-Dichloroethene 5.00 5.33 4.85 107 97.0 71.0-124 9.43 20 <br />cis-1,2-Dichloroethene 5.00 5.18 5.17 104 103 73.0-120 0.193 20 <br />trans-1,2-Dichloroethene 5.00 5.29 5.23 106 105 73.0-120 1.14 20 <br />1,2-Dichloropropane 5.00 4.62 4.43 92.4 88.6 77.0-125 4.20 20 <br />cis-1,3-Dichloropropene 5.00 4.90 4.74 98.0 94.8 80.0-123 3.32 20 <br />trans-1,3-Dichloropropene 5.00 4.38 4.76 87.6 95.2 78.0-124 8.32 20 <br />Hexachloro-1,3-butadiene 5.00 5.10 4.99 102 99.8 54.0-138 2.18 20 <br />2-Hexanone 25.0 14.9 14.9 59.6 59.6 67.0-149 J4 J4 0.000 20 <br />2-Butanone (MEK)25.0 15.6 14.8 62.4 59.2 44.0-160 5.26 20 <br />Iodomethane 25.0 20.6 25.3 82.4 101 33.0-147 20.5 26 <br />Methylene Chloride 5.00 5.01 4.99 100 99.8 67.0-120 0.400 20 <br />4-Methyl-2-pentanone (MIBK)25.0 16.2 16.3 64.8 65.2 68.0-142 J4 J4 0.615 20 <br />Naphthalene 5.00 3.09 3.60 61.8 72.0 54.0-135 15.2 20 <br />n-Propylbenzene 5.00 3.97 4.07 79.4 81.4 77.0-124 2.49 20 <br />Styrene 5.00 4.62 4.53 92.4 90.6 73.0-130 1.97 20 <br />1,1,1,2-Tetrachloroethane 5.00 4.69 4.54 93.8 90.8 75.0-125 3.25 20 <br />1,1,2,2-Tetrachloroethane 5.00 3.71 3.65 74.2 73.0 65.0-130 1.63 20 <br />1,1,2-Trichlorotrifluoroethane 5.00 5.33 5.14 107 103 69.0-132 3.63 20 <br />Tetrachloroethene 5.00 5.61 5.48 112 110 72.0-132 2.34 20 <br />1,2,4-Trichlorobenzene 5.00 3.43 3.55 68.6 71.0 57.0-137 3.44 20 <br />1,1,1-Trichloroethane 5.00 5.15 4.91 103 98.2 73.0-124 4.77 20 <br />1,1,2-Trichloroethane 5.00 4.96 4.80 99.2 96.0 80.0-120 3.28 20 <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 35 of 44 <br />ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: <br />711 Stantec - San Diego, CA 185851132 L1580356 02/10/23 10:37 35 of 44