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ACCOUNT: PROJECT: ATC - San Ramon, CA 2048504278 SDG: DATE/TIME: PAGE: L1465194 03/03/2217:32 26 of 35 WG1823984 QUALITY Volatile Organic Compounds (GC/MS) by Method 8260B L1465139-01 Original Sample (OS) • Matrix Spike (MS) • Matrix Spike Duplicate CONTROL SUMMARY L1455194-05,08 (MSD) (OS) L1465139-01 02/26/22 00:54. (MS) R3764483-3 02/26/22 03:27 • (MSD) R3764483-4 02/26/22 03:46 Spike Amount Original Result MS Rult MSD Result es (dry) MS Rec. MSD Rec. (dry) (dry) (dry) Dilution Rec. Limits MS Qualifier MSD Qualifier RPD RPD Limits Analyte mg/kg mg/kg mg/kg mg/kg % % % % % Chloroform 1.28 U 1.26 1.07 98.2 83.2 8 10.0-146 16.5 37 Chloromethane 1.28 u 1.27 0.902 99.4 70.4 8 10.0-159 34.2 37 2-Chlorotoluene 1.28 U 1.44 1.23 112 95.8 8 10.0-159 15.6 38 4-Chlorotoluene 1.28 U 1.42 1.20 111 94.0 8 10.0-155 16.6 39 1,2-Dibromo-3-Chloropropane 1.28 U 1.21 1.35 94.3 105 8 10.0-151 10.7 39 1,2-Dibromoethane 1.28 U 1.29 1.31 101 102 8 10.0-148 0.985 34 Dibromomethane 1.28 U 1.24 1.21 96.4 94.8 8 10.0-147 1.67 35 1,2-Dichlorobenzene 1.28 7.39 12.3 11.3 382 303 8 10.0-155 V V 8.59 37 1,3-Dichlorobenzene 1.28 u 1.54 1.36 120 106 8 10.0-153 12.4 38 1,4-Dichlorobenzene 1.28 0.513 2.06 1.86 121 105 8 10.0-151 10.5 38 Dichlorodifluoromethane 1.28 U 1.23 0.852 96.2 66.5 8 10.0-160 J3 36.5 35 1,1-Dichloroethane 1.28 U 1.35 1.05 105 81.8 8 10.0-147 24.8 37 1,2-Dichloroethane 1.28 U 1.20 1.14 94.0 89.3 8 10.0-148 5.13 35 1,1-Dichloroethene 1.28 U 1.47 1.03 115 80.5 8 10.0-155 35.3 37 cis-1,2-Dichloroethene 1.28 U 1.22 1.02 95.2 79.7 8 10.0-149 17.7 37 trans-1,2-Dichloroethene 1.28 U 1.23 0.939 96.2 73.3 8 10.0-150 27.0 37 1,2-Dichloropropane 1.28 U 1.29 1.10 101 86.2 8 10.0-148 15.8 37 1,1-Dichloropropene 1.28 U 1.38 1.02 108 79.5 8 10.0-153 30.4 35 1,3-Dichloropropane 1.28 U 1.32 1.28 103 100 8 10.0-154 2.96 35 cis-1,3-Dichloropropene 1.28 U 1.33 1.23 104 96.0 8 10.0-151 8.00 37 trans-1,3-Dichloropropene 1.28 U 1.21 1.18 94.1 92.1 8 10.0-148 2.15 37 2,2-Dichloropropane 1.28 U 1.23 0.864 96.3 67.4 8 10.0-138 35.3 36 Di-isopropyl ether 1.28 U 1.29 1.17 101 91.5 8 10.0-147 9.87 36 Ethylbenzene 1.28 5.96 9.88 8.82 306 223 8 10.0-160 V V 11.4 38 Hexachloro-1,3-butadiene 1.28 U 2.34 240 183 187 8 10.0-160 J5 J5 2.16 40 Isopropylbenzene 1.28 0.925 2.75 2.38 143 114 8 10.0-155 14.5 38 p-lsopropyltoluene 1.28 0.901 2.97 2.64 162 136 8 10.0-160 J5 11.9 40 2-Butanone (MEK) 6.41 U 5.70 6.36 89.0 99.2 8 10.0-160 10.8 40 Methylene Chloride 1.28 U 1.19 1.04 93.1 81.4 8 10.0-141 13.4 37 4-Methyl-2-pentanone (MIBK) 6.41 0.650 7.07 7.51 100 107 8 10.0-160 5.98 35 Methyl tert-butyl ether 1.28 U 1.17 1.14 91.4 89.2 8 11.0-147 2.44 35 Naphthalene 1.28 39.0 56.5 52.3 1370 1040 8 10.0-160 E V E V 7.77 36 n-Propylbenzene 1.28 3.25 6.00 5.37 214 165 8 10.0-158 J5 J5 11.0 38 Styrene 1.28 0.0630 1.47 1.32 110 98.1 8 10.0-160 11.0 40 1,1,1,2-Tetrachloroethane 1.28 U 1.36 1.20 106 93.6 8 10.0-149 12.4 39 1,1,2,2-Tetrachloroethane 1.28 U 2.50 2.18 195 170 8 10.0-160 J5 J5 13.7 35 1,1,2-Trichlorotrifluoroethane 1.28 U 1.50 1.10 117 86.0 8 10.0-160 30.5 36 Tetrachloroethene 1.28 0.0700 1.52 1.19 114 87.0 8 10.0-156 25.1 39 Toluene 1.28 3.50 6.52 5.77 236 177 8 10.0-156 J5 _ J5 12.3 38