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WG1804522 QUALITY CONTROL SUMMARY Volatile Organic Compounds (GC/MS) by Method 8260E3 L1452254-01 Laboratory Control Sample (LCS) • Laboratory Control Sample Duplicate (LCSD) (LCS) R3751767-1 01/19/22 06:43 • (LCSD) R3751767-2 01/19/22 07:01 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 0.106 0.107 84.8 85.6 59.0-130 0.939 20 n-Propylbenzene 0.125 0.128 0.132 102 106 74.0-126 3.08 20 Styrene 0.125 0.125 0.123 100 98.4 72.0-127 1.61 20 1,1,1,2-Tetrachloroethane 0.125 0.141 0.136 113 109 74.0-129 3.61 20 1,1.2,2-Tetrachloroethane 0.125 0.138 0.138 110 110 68.0-128 0.000 20 Tetrachloroethene 0.125 0.132 0.132 106 106 70.0-136 0.000 20 Toluene 0.125 0.126 0.130 101 104 75.0-121 3.12 20 1,1,2-Trichlorotrifluoroethane 0.125 0.141 0.153 113 122 61.0-139 8.16 20 1,2,3-Trichlorobenzene 0.125 0.101 0.107 80.8 85.6 59.0-139 5.77 20 1,2,4-Trichlorobenzene 0.125 0.0912 0.0939 73.0 75.1 62.0-137 2.92 20 1,1,1-Trichloroethane 0.125 0.142 0.146 114 117 69.0-126 2.78 20 1,1,2-Trichloroethane 0.125 0.132 0.131 106 105 78.0-123 0.760 20 Trichloroethene 0.125 0.128 0.123 102 98.4 76.0-126 3.98 20 Trichlorofluoromethane 0.125 0.146 0.146 117 117 61.0-142 0.000 20 1,2,3-Trichloropropane 0.125 0.136 0.142 109 114 67.0-129 4.32 20 1,2,3-Trimethylbenzene 0.125 0.121 0.122 96.8 97.6 74.0-124 0.823 20 1,2,4-Trimethylbenzene 0.125 0.122 0.128 97.6 102 70.0-126 4.80 20 1,3,5-Trimethylbenzene 0.125 0.125 0.131 100 105 73.0-127 4.69 20 Vinyl chloride 0.125 0.149 0.149 119 119 63.0-134 0.000 20 Xylenes, Total 0.375 0.385 0.381 103 102 72.0-127 1.04 20 (S)Toluene-d8 100 101 75.0-131 (S)4-Bromolluorobenzene 102 101 670-138 (S)1,2-Dichloroethone-d4 103 106 70.0-130 L1452176-01 Original Sample (OS) • Matrix Spike (MS) • Matrix Spike Duplicate (MSD) (OS) L1452176-01 01/19/22 13:25 • (MS) R3751767-4 01/19/22 18:11 • (MSD) R3751767-5 01/19/22 Spike Amount Original Result MSD Result MS Result (diy) MS Rec. (dry) (dry) (dry) 18:30 MSD Rec. Dilution Rec. Limits MS Qualifier MSD Qualifier RPD RPD Limits Analyte mg/kg mg/kg mg/kg mg/kg % % % % % -- 0.373 0.392 47.7 Acetone 0.782 U 50.1 1 10.0-160 4.91 40 Acrylonitrile 0.782 U 0.634 0.608 81.1 77.8 1 10.0-160 4.23 40 Benzene 0.156 U 0.185 0.113 118 72.4 1 10.0-149 J3 48.2 37 Bromobenzene 0.156 U 0.181 0.125 116 79.9 1 10.0-156 36.8 38 Bromodichloromethane 0.156 U 0.191 0.141 122 90.4 1 10.0-143 30.1 37 Bromoform 0.156 U 0.184 0.150 118 96.0 1 10.0-146 20.2 36 Bromomethane 0.156 U 0.220 0.122 141 77.8 1 10.0-149 J3 57.6 38 n-Butylbenzene 0.156 U 0.205 0.133 131 84.8 1 10.0-160 J3 43.0 40 sec-Butylbenzene 0.156 U 0.194 0.118 124 75.3 1 10.0-159 J3 48.9 39 tert-Butylbenzene 0.156 U 0.189 0.116 121 74.2 1 10.0-156 J3 47.8 39 ACCOUNT: PROJECT: SDG: DATE/TIME: PAGE: ATC - San Ramon, CA 204BS04278 L1452254 01/27/22 11:24 17 of 23