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a— ) (7Sequoia 1455 McDowellPetaluuma CA 94954 <br /> Analytical FAX <br /> 07)792-1865 <br /> (707)792 0342 <br /> 0 www sequoialabs coin <br /> URS Corp-Sacramento Project Arco Site 760,Lodi,CA P401360 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36622 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 02/06/04 09 57 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical-PetaIuma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4020010-EPA 5030B waters <br /> Laboratory Control Sample Dup(4020010-BSDI) Prepared&Analyzed 02/02/04 <br /> Tert-amyl methyl ether 526 1 0 ug/1 5 00 105 78-117 3 20 <br /> Benzene 5 14 0 50 5 00 103 81-118 2 20 <br /> Tert-butyl alcohol 99 5 20 100 100 60-147 0 2 20 <br /> Di-isopropyl ether 5 11 1 0 5 00 102 70-125 0 2 20 <br /> 1,2-Dibromoethane(EDB) 4 95 0 50 500 99 85-125 0 2 20 <br /> 1,2-Dichloroethane 5 20 0 50 5 00 104 77-126 2 20 <br /> Ethanol 141 100 100 141 55-200 46 20 Q-LIM <br /> Ethylbenzene 499 050 5 00 100 89-122 0 6 20 <br /> Ethyl tert-butyl ether 5 27 1 0 5 00 105 71-120 0 6 20 <br /> Methyl tert-butyl ether 5 66 050 5 00 113 70-122 0 7 20 <br /> Toluene 475 050 5 00 95 84-119 2 20 <br /> Aammi,Xylenes(total) 15 0 050 15 0 100 86-132 2 20 <br /> urrogate Dibromofluoromethane 680 600 113 84-122 <br /> Surrogate 12-Dichloroethane-d4 607 6 00 101 74-135 <br /> Surrogate Toluene-d8 623 6 00 104 84-119 <br /> Surrogate 4-BromoJluorobenzene 606 6 00 101 86-119 <br /> Sequoia Analytical-PetaIuma The results in this report apply to the samples analyzed in accordance with the chain <br /> . of custody document Unless otherwise stated results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 8 of 9 <br />