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1455 McDowell Blvd North Ste <br /> Sequoia Petaluma,CA <br /> 4 <br /> (707)792 1865 <br /> Analytical FAX(707)792 0342 <br /> www sequoialabs corn <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 %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4070008-EPA 5030B waters <br /> Blank(4070008-BLKI) Prepared&Analyzed 07/01/04 <br /> Surrogate 1 2-Drchloroethane-d4 550 ug/1 500 110 74 135 <br /> Surrogate Toluene-d8 543 500 109 84-119 <br /> Surrogate 4-BromaJluorobenzene 547 500 109 86-119 <br /> Laboratory Control Sample(4070008-BSI) Prepared&Analyzed 07/01/04 <br /> Benzene 174 10 ugR 200 87 37-151 <br /> Bromodichloromethane 203 10 200 102 35-155 <br /> Bromoform 205 10 200 102 45-169 <br /> Bromomethane 186 10 200 93 0 1-242 <br /> Carbon tetrachloride 210 10 200 105 70 140 <br /> Chlorobenzene 193 10 200 96 37 160 <br /> Chloroethane 177 10 200 88 14 230 <br /> 2 Chloroethylvinyl ether 17 6 10 200 88 0 1-305 . <br /> Chloroform 196 10 200 98 51-138 <br /> Chloromethane 152 10 200 76 01 273 <br /> Dibromochloromethane 214 to 200 107 53-149 <br /> 1,2-Dichlorobenzene 194 10 200 97 18 190 <br /> 1,3-Dichlorobenzene 193 10 200 96 59 156 <br /> 1,4-Dichlorobenzene 188 10 200 94 18-190 <br /> 1,1 Drchloroethane 19 0 l 0 200 95 59-155 <br /> 1,2 Drchloroethane 200 10 200 100 49 155 <br /> 1,1-Dichloroethene 175 10 200 88 01-234 <br /> trans 42-Mchloroethene 182 10 200 91 54 156 <br /> 1,2-Dichloropropane 184 10 " 200 92 01 210 <br /> cis-1,3-Dichloropropene 193 10 200 96 01 227 <br /> trans-1,3 Dichloropropene 196 10 200 98 17-183 <br /> Ethylbenzene 19 8 1 0 200 99 37-162 <br /> Methylene chloride 17 8 1 0 200 89 01-221 <br /> Methyl Cert-butyl ether 182 1 0 200 91 70 130 <br /> 1,1,2,2-Tetrachloroethane IHS 10 200 94 46157 <br /> Tetrachloroethane 196 1 0 " 200 98 64-148 <br /> Toluene 187 10 200 94 47-150 <br /> 1,1,2-Trichloroethane 196 10 200 98 52-150 <br /> 1,1,1-Tnchloroethane 206 10 200 103 52-162 <br /> Tnchloroethene 191 10 200 96 71-157 <br /> Tnchlorofluoromethane 211 10 200 106 17 181 <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 12 of 20 <br />