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11455 McDowell Blvd,North Ste D <br /> Sequoia Petatuma CA 94954 <br /> (707)792-0815 <br /> Analytical <br /> FAX(707)792-0342 <br /> www sequotalabs com <br />' URS Corp-Sacramento Project Arco Site 760,Lodi,CA P403600 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number G09JZ-0039 Reported <br /> Sacramento CA,95833 Project Manager Vemon P Elarth 04/08/04 14 36 <br /> Volatile Organic Compounds by EPA Method 8260B- 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 4040052-EPA 5030( res 48h <br /> Blank(4040052-BLKI) Prepared&Analyzed 04/02/04 <br /> Tert-amyl methyl ether ND 00050 mg/kg <br /> Benzene ND 00050 <br /> Tert-butyl alcohol ND 010 <br /> Di-tsopropyl ether ND 00050 <br /> 1,2-Dibromoethane(EDB) ND 00050 " <br /> 12-Dtchloroethane ND 00050 <br /> Ethanol ND 020 <br /> Ethylbenzene ND 00050 " <br /> Ethyl tert-butyl ether ND 00050 <br /> Methyl tert-butyl ether ND 00050 <br /> Toluene ND 00050 <br /> Xylenes(total) ND 00050 " <br /> Ifturrogate Dibromofluoromerharte 00489 00500 98 81-126 <br /> rrogate 1 2-Dtchloroethane-d4 00504 00500 101 73-131 <br /> Surrogate Toluene-d8 00498 00500 100 82-129 <br /> Laboratory Control Sample(4040052-BSI) Prepared&Analyzed 04/02/04 <br /> Tert-amyl methyl ether 00569 00050 mg/kg 00500 114 74-126 <br /> Benzene 00493 00050 00500 99 75-123 <br /> Tert butyl alcohol 0 815 010 " 100 82 66-129 <br /> Di isopropyl ether 00497 00050 00500 99 71-127 <br /> 1,2 Dibromoethane(EDB) 00518 00050 00500 104 88-118 <br /> 1,2 Dtchloroethane 00495 00050 00500 99 79-119 <br /> Ethanol 0 787 0 20 100 79 70-140 <br /> Ethylbenzene 00487 00050 00500 97 65-135 <br /> Ethyl tert-butyl ether 00546 00050 00500 109 72-123 <br /> Methyl tert-butyl ether 0 0492 00050 " 00500 98 70-125 <br /> Toluene 00492 00050 00500 98 76-123 <br /> Surrogate Dtbromofluoromethane 00495 00500 99 81-126 <br /> 1 Surrogate 1 2-Dichloroethane-d4 00505 n 00500 101 73-131 <br /> Surrogate Toluene-d8 00531 00500 106 81-129 <br /> Sequoia Analytical-Petaluma 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 bast& <br /> This analytical report must be reproduced to its entirety <br /> Page 14 of 18 <br />