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b, <br /> (D (701455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> Analytical FAX <br /> 7)792-1865 <br /> 707)792-0342 <br /> . www sequotalabs win <br /> URS Corp-Sacramento Project Arco Site 760,Lodi,CA P307501 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number VM6622 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Marth 08/11/03 13 44 <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 3070681-EPA 5030 waters <br /> Laboratory Control Sample Du 3070681-BSDI PEEarcd&Analyzed 07/31/03 <br /> Tert-amyl methyl ether 464 1 0 ugll 5 00 93 70-116 5 20 <br /> Benzene 530 0 50 500 106 81-118 3 20 <br /> Tert-butyl alcohol 997 20 100 100 62-142 11 20 <br /> Dr-isopropyl ether 476 1 0 500 95 71-121 6 20 <br /> 1,2-Dibromoethane(EDB) 5 58 0 50 500 112 92-117 3 20 <br /> 1,2-Diebloroethane 5 22 0 50 5 00 104 79-126 7 20 <br /> Ethyl tert-butyl ether 4 56 1 0 5 00 91 71-110 8 20 <br /> Methyl tert-butyl ether 4 66 0 50 5 00 93 77-123 12 20 <br /> Toluene 5 54 0 50 500 111 84-119 4 20 <br /> Surrogate Dibromofluoromethane 500 450 111 84-111 <br /> Surrogate 12-Drchloroethane-d4 448 450 100 74-135 <br /> *regate Toluene-d8 450 450 100 84-119 <br /> rrogate 4-Bromofluorobenzene 460 " 450 101 86-119 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document Unless otherwise stated resulls are reported on a we/weight <br /> 0 basis This analytical report must be reproduced in its entirety <br /> Page 8 of 9 <br />