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.5 " <br /> Sequoia E455 McDowell North Ste <br /> � <br /> Petaluma CA 949544 <br /> (107)792-1865 <br /> ZqW Analytical FAX(707)792-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 6100,Tracy,CA P402493 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36619 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 03/17/04 15 30 <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 4030433-EPA 5030 soils <br /> Laboratory Control Sample Du 4030433-BSD1 Prepared&Analyzed 03/16/04 <br /> Tert-amyl methyl ether 0 0508 00050 mg/kg 00500 102 74-126 2 35 <br /> Benzene 0 0509 00050 00500 102 75-123 0 8 35 <br /> Tert-butyl alcohol 0 938 0 10 1 00 94 66-129 2 35 <br /> Di-isopropyl ether 00505 00050 00500 101 71-127 4 35 <br /> 1 2-Dibromoethane(EDB) 0 0517 00050 00500 103 88-118 3 35 <br /> 1,2-Dtchloroethane 00491 00050 00500 98 79-119 0 8 35 <br /> Ethanol 0 971 020 1 00 97 70-140 4 35 <br /> Ethylbenzene 00533 00050 00500 107 65-135 2 35 <br /> Ethyl tent-butyl ether 0 0491 00050 00500 98 72-123 3 35 <br /> Methyl tert-butyl ether 0 0502 00050 00500 100 70-125 0 4 35 <br /> Toluene 0 0523 00050 00500 105 76-123 1 35 <br /> ogate Dibromoluoromethane 00487 I, 00450 108 81-126 <br /> ogate l 2-Dtchloroethane-d4 00459 00450 102 73-131 <br /> Surrogate Toluene-d8 00518 00450 115 82-129 <br /> ola Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document Unless otherwise slated results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 24 of 25 <br />