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8Drive <br /> + Sequoia MorganHill <br /> CA CA 9503037 <br /> (408)776-9600 <br /> i1 Analytical www <br /> seq 8) labs82 co 8 <br /> www sequwalabs com <br /> • <br /> Secor-Rancho Cordova(ARCO) Project ARCO#2133,Stockton,CA MPCO246 <br /> 3017 Kilgore Rd Suite 100 Project Number Arco#2133, Stockton,CA Reported <br /> Rancho Cordova CA,95670 Project Manager Brian Carey 04/11/06 09 55 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 6CO9022-EPA 5035/EPA$260B <br /> Laboratory Control Sample Dup(6C09022-BSD2) Prepared&Analyzed 03/09/06 <br /> Xylenes(total) 00182 00050 mg/kg 00204 89 80-140 5 20 <br /> Gasoline Range Organics(C4-C 12) 0 224 0 10 0 220 102 53-126 5 25 <br /> Surrogate 12-Drchloroethane-d4 000397 000500 79 60-125 <br /> Batch 6CO9025- EPA 50351 EPA 8260B <br /> Laboratory Control Sample(6C09025-BSI) Prepared&Analyzed 03/09/06 <br /> Chlorobenzene 00106 00050 mglkg 00100 106 85-130 <br /> 1 2-Dichlorobenzene 00107 00050 00100 107 80-145 <br /> 1 3 Dichlorobenzene 00109 00050 00100 109 80-130 <br /> 1,4 Dichlorobenzene 00107 00050 00100 107 80-135 <br /> arrogate Dibromofluoromethane 000471 000500 94 55-125 <br /> Vragate Toluene-d8 000513 i` 000500 103 65-130 <br /> ogate 4-BromoJluorobemene 000507 000500 101 75-120 <br /> Laboratory Control Sample(6C09025-BS2) Prepared&Analyzed 03/09/06 <br /> tert-Amyl methyl ether 00148 00050 mg/kg 00163 91 80-130 <br /> Benzene 0 00440 00050 000504 87 65-125 <br /> tert-Butyl alcohol 0153 0020 0 169 91 80-165 <br /> Di-isopropyl ether 00142 00050 00162 88 85-115 <br /> l 2-Dibromoethane(EDB) 00158 00050 00166 95 85-130 <br /> 1 2-Dichloroethane 00139 00050 00155 90 63-124 <br /> Ethanol 0 532 0 l0 0 165 322 35-150 HL <br /> Ethyl tert-butyl ether 00144 00050 00164 88 80-125 <br /> Ethylbenzene 000637 00050 000728 88 80-135 <br /> Methyl ten butyl ether 000624 00050 000784 80 75-115 <br /> Toluene 00321 00050 00380 84 85 125 HM <br /> Xylenes(total) 00375 00050 00408 92 80-140 <br /> Gasolme Range Organics(C4-C12) 0 426 0 10 0 440 97 53-126 <br /> Surrogate 12 Dichloroethane-d4 000421 000500 84 60-115 <br /> �quota Analytical - Morgan Hill The results in this report apply to the samples analyzed;n 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 20 of 29 <br />