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i Blvd, <br /> Ste D <br /> Sequoia 1455 McbowPetaluma CA 94954 <br /> a— ) (707)Analytical FAX 7921865 <br /> 792 0342 <br /> www sequotequoialabs com.om <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P406416 <br /> 3017 Kilgare Road Suite 100 Project Number WR 63964 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 07/14/04 16 40 <br /> DRAFT: Purgeables by EPA Method 624-Quality Control <br /> Sequoia Analytical- Petaluma <br /> Reporting Spike Source °/oREC RPD <br /> Analyte Result Limit Units Level Result %REC Larios RPD Limn Notes <br /> Batch 4070008-EPA 5030B waters <br /> Laboratory Control Sample(4070008-BSI) Prepared&Analyzed 07/01/04 <br /> Vinyl chloride 170 1 0 ugll 200 85 01 251 <br /> Surrogate Dibromofluoromethane 533 500 107 84 122 <br /> Surrogate 12-Diehloroelhane d4 538 goo 108 74 135 <br /> Surrogate Toluene d8 548 500 110 84 119 <br /> Surrogate 4-Bromo luorobenzene 521 500 104 86 119 <br /> Matrix Spike(4070008-MSI) Source P406416-01 Prepared&Analyzed 07/01/04 <br /> Benzene 179 10 ugH 200 ND 90 37-151 <br /> Bromodtchloromethane 214 10 200 ND 107 35-155 <br /> Bromoform 198 10 200 ND 99 45-169 <br /> Bromomethane 149 10 200 ND 74 01 242 <br /> Carbon tetrachloride 22 9 10 200 ND 114 70-140 <br /> Chlorobenzene 196 10 200 ND 98 37 160 <br /> Chloroethane 193 10 200 ND 96 14 230 <br /> 2 Chloroethylvinyl ether ND 10 200 ND 0 1 305 2-CVE <br /> Chloroform 227 10 200 ND 114 51 138 <br /> Chloromethane 14 9 10 200 ND 74 01 273 <br /> Dibromochloromethane 21 3 10 200 ND 106 53-149 <br /> 1,2-Dichlorobenzene 189 10 200 ND 94 18 190 <br /> 1,3-Dichlorobenzene 191 10 200 ND 96 59 156 <br /> 1,4-Dichlorobenzene 186 10 200 ND 93 H-190 <br /> ]J-Dichloroethane 221 10 200 ND 110 59-155 <br /> 1,2-Dtchloroethane 219 10 200 ND 110 49-155 <br /> IJ-Dtchloroethene 204 10 200 ND 102 01 234 <br /> trans-1,2 Dtchloroethene 217 10 200 ND 108 54-156 <br /> 1,2-Dichloropropane 192 10 200 ND 96 01 210 <br /> cis-1,3 Dichloropropene 191 10 200 ND 96 01 227 <br /> trans-1 3 Dichloropropene 187 10 200 ND 94 17-183 <br /> Ethylbenzene 198 10 200 ND 99 37-162 <br /> Methylene chloride 204 10 20 0 ND 102 01 221 <br /> Methyl tert butyl ether 203 l 0 20 0 ND 102 70 130 <br /> 1,1,2,2 Tetrachloroethane 189 10 20 0 ND 94 46-157 <br /> Tetrachloroethene 200 10 20 0 ND 100 64-148 <br /> Toluene 188 10 20 0 ND 94 47 150 <br /> 1,1,2-Tnchloroethane 193 10 20 0 ND 96 52 150 <br /> 1,10-Trichloroethane 227 10 200 ND 114 52162 <br /> DRAFT REPORT The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless otherwise stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 13 of 20 <br />