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WG2044363 QUALITY CONTROL SUMMARY Volatile Organic Compounds (GC/MS) by Method 8260B L1606082-03 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 Cp Spike Amount Original Result MS Result MSD Result MS Rec. MSD Rec. Dilution Rec.Limits MS Qualifier MSD Qualifier RPD RPD Limits Fc Analyte ug/I ug/I ug/I ug/I % % % % % n-Butylbenzene 250 U 214 172 85.6 68.8 50 31.0-150 21.8 30 sec-Butylbenzene 250 U 226 183 90.4 73.2 50 33.0-155 21.0 29 FS tert-Butyl benzene 250 U 249 202 99.6 80.8 50 34.0-153 20.8 28 Carbon tetrachloride 250 U 308 239 123 95.6 50 23.0-159 25.2 28 FCn]Carbon disulfide 250 U 268 213 107 85.2 50 10.0-156 22.9 28 Chlorobenzene 250 U 307 235 123 94.0 50 33.0-152 26.6 27 Chlorodibromomethane 250 U 265 225 106 90.0 50 37.0-149 16.3 27 Fr Chloroethane 250 U 378 296 151 118 50 10.0-160 24.3 30 Chloroform 250 8.61 282 227 113 90.8 50 29.0-154 21.6 28 Chloromethane 250 U 280 224 112 89.6 50 10.0-160 22.2 29 1,2-Dibromo-3-Chloropropane 250 U 220 205 88.0 82.0 50 22.0-151 7.06 34 1,2-Dibromoethane 250 U 250 221 100 88.4 50 34.0-147 12.3 27 FG Dibromomethane 250 U 267 217 107 86.8 50 30.0-151 20.7 27 1,2-Dichlorobenzene 250 U 250 206 100 82.4 50 34.0-149 19.3 28 1,3-Dichlorobenzene 250 U 263 221 105 88.4 50 36.0-146 17.4 27 gAl 1,4-Dichlorobenzene 250 U 264 212 106 84.8 50 35.0-142 21.8 27 trans-1,4-Dichloro-2-butene 250 U 247 213 98.8 85.2 50 10.0-157 14.8 37 ITC Dichlorodifluoromethane 250 U 431 337 172 135 50 10.0-160 J5 24.5 29 1,1-Dichloroethane 250 U 293 240 117 96.0 50 25.0-158 19.9 27 1,2-Dichloroethane 250 U 291 245 116 98.0 50 29.0-151 17.2 27 1,1-Dichloroethene 250 U 271 219 108 87.6 50 11.0-160 21.2 29 cis-1,2-Dichloroethene 250 U 278 230 111 92.0 50 10.0-160 18.9 27 trans-1,2-Dichloroethene 250 U 305 228 122 91.2 50 17.0-153 J3 28.9 27 1,2-Dichloropropane 250 U 282 229 113 91.6 50 30.0-156 20.7 27 cis-1,3-Dichloropropene 250 U 265 214 106 85.6 50 34.0-149 21.3 28 trans-1,3-Dichloropropene 250 U 260 219 104 87.6 50 32.0-149 17.1 28 Ethylbenzene 250 U 283 226 113 90.4 50 30.0-155 22.4 27 Hexachloro-1,3-butadiene 250 U 184 157 73.6 62.8 50 20.0-154 15.8 34 2-Hexanone 1250 U 1270 1120 102 89.6 50 21.0-160 12.6 29 2-Butanone(MEK) 1250 U 1340 1200 107 96.0 50 10.0-160 11.0 32 lodomethane 1250 U 866 828 69.3 66.2 50 10.0-160 4.49 40 Methylene Chloride 250 U 267 222 107 88.8 50 23.0-144 18.4 28 4-Methyl-2-pentanone(MIBK) 1250 U 1330 1120 106 89.6 50 29.0-160 17.1 29 Naphthalene 250 U 190 166 76.0 66.4 50 12.0-156 13.5 35 n-Propylbenzene 250 U 262 206 105 82.4 50 31.0-154 23.9 28 Styrene 250 U 265 208 106 83.2 50 33.0-155 24.1 28 1,1,1,2-Tetrachloroethane 250 U 300 251 120 100 50 36.0-151 17.8 29 1,1,2,2-Tetrachloroethane 250 U 253 218 101 87.2 50 33.0-150 14.9 28 1,1,2-Trichlorotrifluoroethane 250 U 287 228 115 91.2 50 23.0-160 22.9 30 Tetrachloroethene 250 U 316 239 126 95.6 50 10.0-160 J3 27.7 27 ACCOUNT: PROJECT: SDG: DATE/TIME: PAGE: Antea-Rancho Cordova ARCO 2093 L1606082 04/21/2314:00 28 of 34