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bt s •-a . 1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> • www sequotalabs cum <br /> URS Com-Sacramento Project Arco Site 760,Lodi,CA P310474 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36622 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 11/04/03 11 41 <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 3100829-EPA 5030 waters <br /> Laboratory Control Sample Du (3100829-BSD1) Prepared&Analyzed 10/31/03 <br /> Tert-amyl methyl ether 492 1 0 u9/1 5 00 98 70-116 12 20 <br /> Benzene 4 95 050 5 00 99 81-118 9 20 <br /> Ter-butyl alcohol 92 7 20 100 93 62-142 5 20 <br /> Di-isopropyl ether 4 93 1 0 5 00 99 71-121 17 20 <br /> 1,2-Dibromoethane(EDB) 5 70 050 5 00 114 92-117 2 20 <br /> 1,2-Dicbloroethane 5 33 050 5 00 107 79-126 9 20 <br /> Ethanol 780 100 100 78 65-135 25 20 QR-02 <br /> Ethylbenzene 5 38 050 5 00 108 89-122 0 6 20 <br /> Ethyl Cert-butyl ether 546 1 0 5 00 109 71-110 5 20 <br /> Methyl tert-butyl ether 5 04 0 50 5 00 101 77-123 17 20 <br /> Toluene 5 16 050 500 103 84-119 3 20 <br /> AIJILXylenes(total) 149 0 50 150 99 86-132 3 20 <br /> arrogate Dibromofluoromethane 551 500 110 84-122 <br /> Surrogate 12-Dichloroethane-d4 568 500 114 74-135 <br /> Surrogate Toluene-d8 520 Soo 104 84-719 <br /> Surrogate 4-Bromafluorobenzene 5 18 500 104 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 results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 10 of 11 <br />