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WG1824845 QUALITY CONTROL SUMMARY Volatile Organic Compounds (GC/MS) by Method 82 6 0 8 L1465194-01,05,08 Laboratory Control Sample (LCS) • Laboratory Control Sample Duplicate (LCSD) (LCS) R3764804-1 02/28/22 13:48 • (LCSD) R3764804-2 02/28/22 14:07 Spike Amount LCS Result LCSD Result LCS Rec. LCSD Rec. Rec. Limits LCS Qualifier LCSD Qualifier RPD RPD Limits Analyte mg/kg mg/kg mg/kg % % % % % Naphthalene 0.125 0.103 0.109 82.4 87.2 59.0-130 5.66 20 n-Propylbenzene 0.125 0.116 0.115 92.8 92.0 74.0-126 0.866 20 Styrene 0.125 0.108 0.101 86.4 80.8 72.0-127 6.70 20 1,1,1,2-Tetrachloroethane 0.125 0.111 0.108 88.8 86.4 74.0-129 2.74 20 1,1,2,2-Tetrachloroethane 0.125 0.109 0.112 87.2 89.6 68.0-128 2.71 20 1,1,2-Trichlorotrifluoroethane 0.125 0.117 0.109 93.6 87.2 61.0-139 7.08 20 Tetrachloroethene 0.125 0.135 0.136 108 109 70.0-136 0.738 20 Toluene 0.125 0.122 0.119 97.6 95.2 75.0-121 2.49 20 1,2,3-Trichlorobenzene 0.125 0.114 0.106 91.2 84.8 59.0-139 7.27 20 1,2,4-Trichlorobenzene 0.125 0.115 0.103 92.0 82.4 62.0-137 11.0 20 1,1,1-Trichloroethane 0.125 0.120 0.116 96.0 92.8 69.0-126 3.39 20 1,1,2-Trichloroethane 0.125 0.130 0.128 104 102 78.0-123 1.55 20 Trichloroethene 0.125 0.123 0.121 98.4 96.8 76.0-126 1.64 20 Trichlorofluoromethane 0.125 0.114 0.105 91.2 84.0 61.0-142 8.22 20 1,2,3-Trichloropropane 0.125 0.111 0.114 88.8 91.2 67.0-129 2.67 20 1,2,4-Trimethylbenzene 0.125 0.109 0.102 87.2 81.6 70.0-126 6.64 20 1,2,3-Trimethylbenzene 0.125 0.109 0.106 87.2 84.8 74.0-124 2.79 20 1,3,5-Trimethylbenzene 0.125 0.113 0.109 90.4 87.2 73.0-127 3.60 20 Vinyl chloride 0.125 0.107 0.103 85.6 82.4 63.0-134 3.81 20 Xylenes, Total 0.375 0.359 0.336 95.7 89.6 72.0-127 6.62 20 (5) Toluene-d8 102 100 75.0-131 (S) 4-Bromothiorobenzene 90.8 874 670-138 (S) t2-Dichloroethane-d4 91.1 93.8 70.0-130 ACCOUNT: PROJECT: SDG: DATE/TIME: PAGE: ATC -San Ramon, CA 2048504278 L1465194 03/03/2217:32 31 of 35