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WG2044363 QUALITY CONTROL SUMMARY Volatile Organic Compounds (GC/MS) by Method 8260B L1606082-03 Laboratory Control Sample (LCS) • Laboratory Control Sample Duplicate (LCSD) (LCS)R3914818-1 04/18/23 21:23•(LCSD)R3914818-2 04/18/23 21:43 C p Spike Amount LCS Result LCSD Result LCS Rec. LCSD Rec. Rec.Limits LCS Qualifier LCSD Qualifier RPD RPD Limits 2 Analyte ug/I ug/I ug/I % % % % % TC Bromochloromethane 5.00 5.17 5.59 103 112 76.0-122 7.81 20 Bromodichloromethane 5.00 4.59 5.22 91.8 104 75.0-120 12.8 20 FS Bromoform 5.00 4.34 5.06 86.8 101 68.0-132 15.3 20 Bromomethane 5.00 3.58 4.35 71.6 87.0 10.0-160 19.4 25 FCn]n-Butylbenzene 5.00 3.89 4.51 77.8 90.2 73.0-125 14.8 20 sec-Butylbenzene 5.00 4.06 4.68 81.2 93.6 75.0-125 14.2 20 tert-Butyl benzene 5.00 4.42 5.01 88.4 100 76.0-124 12.5 20 Fr Carbon tetrachloride 5.00 4.87 5.89 97.4 118 68.0-126 19.0 20 Carbon disulfide 5.00 4.63 5.60 92.6 112 61.0-128 19.0 20 Chlorobenzene 5.00 5.14 5.69 103 114 80.0-121 10.2 20 Chlorodibromomethane 5.00 4.78 5.08 95.6 102 77.0-125 6.09 20 Chloroethane 5.00 5.99 8.22 120 164 47.0-150 J3 J4 31.4 20 FG Chloroform 5.00 4.90 5.48 98.0 110 73.0-120 11.2 20 Chloromethane 5.00 4.80 5.66 96.0 113 41.0-142 16.4 20 1,2-Dibromo-3-Chloropropane 5.00 4.16 4.65 83.2 93.0 58.0-134 11.1 20 gAl 1,2-Dibromoethane 5.00 4.32 4.88 86.4 97.6 80.0-122 12.2 20 Dibromomethane 5.00 4.89 4.95 97.8 99.0 80.0-120 1.22 20 ITC 1,2-Dichlorobenzene 5.00 4.62 4.88 92.4 97.6 79.0-121 5.47 20 1,3-Dichlorobenzene 5.00 4.58 4.94 91.6 98.8 79.0-120 7.56 20 1,4-Dichlorobenzene 5.00 4.55 5.18 91.0 104 79.0-120 12.9 20 trans-1,4-Dichloro-2-butene 5.00 3.99 4.87 79.8 97.4 33.0-144 19.9 20 Dichlorodifluoromethane 5.00 6.62 8.08 132 162 51.0-149 J4 19.9 20 1,1-Dichloroethane 5.00 4.94 5.68 98.8 114 70.0-126 13.9 20 1,2-Dichloroethane 5.00 5.11 5.68 102 114 70.0-128 10.6 20 1,1-Dichloroethene 5.00 4.70 5.71 94.0 114 71.0-124 19.4 20 cis-1,2-Dichloroethene 5.00 4.71 5.55 94.2 111 73.0-120 16.4 20 trans-1,2-Dichloroethene 5.00 5.02 5.88 100 118 73.0-120 15.8 20 1,2-Dichloropropane 5.00 5.08 5.27 102 105 77.0-125 3.67 20 cis-1,3-Dichloropropene 5.00 4.51 5.06 90.2 101 80.0-123 11.5 20 trans-1,3-Dichloropropene 5.00 4.61 5.01 92.2 100 78.0-124 8.32 20 Ethylbenzene 5.00 4.75 5.52 95.0 110 79.0-123 15.0 20 Hexachloro-1,3-butadiene 5.00 3.30 3.90 66.0 78.0 54.0-138 16.7 20 2-Hexanone 25.0 23.4 25.5 93.6 102 67.0-149 8.59 20 2-Butanone(MEK) 25.0 24.6 28.0 98.4 112 44.0-160 12.9 20 lodomethane 25.0 16.7 21.8 66.8 87.2 33.0-147 J3 26.5 26 Methylene Chloride 5.00 4.70 5.24 94.0 105 67.0-120 10.9 20 4-Methyl-2-pentanone(MIBK) 25.0 23.7 26.4 94.8 106 68.0-142 10.8 20 Naphthalene 5.00 3.64 3.85 72.8 77.0 54.0-135 5.61 20 n-Propylbenzene 5.00 4.47 5.08 89.4 102 77.0-124 12.8 20 Styrene 5.00 4.42 5.14 88.4 103 73.0-130 15.1 20 ACCOUNT: PROJECT: SDG: DATE/TIME: PAGE: Antea-Rancho Cordova ARCO 2093 L1606082 04/21/2314:00 26 of 34