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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 1,1,1,2-Tetrachloroethane 5.00 5.10 5.67 102 113 75.0-125 10.6 20 1,1,2,2-Tetrachloroethane 5.00 4.30 4.34 86.0 86.8 65.0-130 0.926 20 FS 1,1,2-Trichlorotrifluoroethane 5.00 4.78 5.53 95.6 111 69.0-132 14.5 20 Tetrachloroethene 5.00 5.22 6.02 104 120 72.0-132 14.2 20 FCn]Toluene 5.00 5.00 5.87 100 117 79.0-120 16.0 20 1,2,4-Trichlorobenzene 5.00 3.94 4.22 78.8 84.4 57.0-137 6.86 20 1,1,1-Trichloroethane 5.00 5.39 6.06 108 121 73.0-124 11.7 20 Fr 1,1,2-Trichloroethane 5.00 4.55 4.98 91.0 99.6 80.0-120 9.02 20 Trichloroethene 5.00 5.05 5.65 101 113 78.0-124 11.2 20 Trichlorofluoromethane 5.00 5.22 6.13 104 123 59.0-147 16.0 20 1,2,3-Trichloropropane 5.00 4.31 4.67 86.2 93.4 73.0-130 8.02 20 1,2,4-Trimethylbenzene 5.00 4.28 4.89 85.6 97.8 76.0-121 13.3 20 FG 1,3,5-Trimethyl benzene 5.00 4.31 4.83 86.2 96.6 76.0-122 11.4 20 Vinyl acetate 25.0 21.9 19.6 87.6 78.4 11.0-160 11.1 20 s Vinyl chloride 5.00 5.17 6.87 103 137 67.0-131 J3 J4 28.2 20 AI Xylenes,Total 15.0 13.8 16.1 92.0 107 79.0-123 15.4 20 Di-isopropyl ether 5.00 4.80 5.20 96.0 104 58.0-138 8.00 20 FC ethanol 250 255 269 102 108 10.0-160 5.34 30 Ethyl tert-butyl ether 5.00 4.54 4.86 90.8 97.2 63.0-138 6.81 20 Methyl tert-butyl ether 5.00 4.47 4.95 89.4 99.0 68.0-125 10.2 20 tert-Butyl alcohol 25.0 25.1 27.6 100 110 27.0-160 9.49 30 tert-Amyl Methyl Ether 5.00 4.52 4.99 90.4 99.8 66.0-125 9.88 20 (S)Toluene-d8 104 104 80.0-120 (S)4-Bromofluorobenzene 101 102 77.0-126 (S)1,2-Dichloroethane-d4 102 105 70.0-130 L1606151-01 Original Sample (OS) • Matrix Spike (MS) • Matrix Spike Duplicate (MSD) (OS)L1606151-01 04/19/23 05:51•(MS)R3914818-4 04/19/23 06:12•(MSD)R3914818-5 04/19/23 06:32 Spike Amount Original Result MS Result MSD Result MS Rec. MSD Rec. Dilution Rec.Limits MS Qualifier MSD Qualifier RPD RPD Limits Analyte ug/I ug/I ug/I ug/I % % % % % Acetone 1250 U 1250 1120 100 89.6 50 10.0-160 11.0 35 Acrylonitrile 1250 U 1370 1160 110 92.8 50 21.0-160 16.6 32 Benzene 250 U 279 224 112 89.6 50 17.0-158 21.9 27 Bromobenzene 250 U 246 205 98.4 82.0 50 30.0-149 18.2 28 Bromochloromethane 250 U 287 256 115 102 50 38.0-142 11.4 26 Bromodichloromethane 250 U 268 222 107 88.8 50 31.0-150 18.8 27 Bromoform 250 U 252 224 101 89.6 50 29.0-150 11.8 29 Bromomethane 250 U 276 218 110 87.2 50 10.0-160 23.5 38 ACCOUNT: PROJECT: SDG: DATE/TIME: PAGE: Antea-Rancho Cordova ARCO 2093 L1606082 04/21/2314:00 27 of 34