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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> + + (707)792-1865 <br /> 1:9X(707 <br /> Analytical <br /> www sequoialabs alabs com <br /> URS Corp-Sacramento Project Arco Site 2168,Stockton,CA P308095 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36590 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 10/16/03 11 34 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result L1mlt Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3080169-EPA 5030 waters <br /> Laboratory Control Sample Dup(3080169-BSDI) Prepared&Analyzed 08/09/03 <br /> Tert-amyl methyl ether 542 10 ug/t 500 108 70-116 7 20 <br /> Benzene 5 55 050 Soo 111 81-118 2 20 <br /> Tert-butyl alcohol 919 20 100 92 62-142 14 20 <br /> Di-isopropyl ether 533 10 500 107 71-121 1 20 <br /> 1,2-Dibromoethane(EDB) 593 050 500 119 92-117 7 20 Q-LIM <br /> 1,2-Dichloroethane 549 050 500 110 79-126 6 20 <br /> Ethyl tert-butyl ether 518 10 500 104 71-110 6 20 <br /> Methyl tert-butyl ether 534 050 500 107 77-123 7 20 <br /> Toluene 5 12 050 500 102 84-119 2 20 <br /> Surrogate Dibromofluoromethane 4 74 450 105 84-122 <br /> Surrogate 12-Dichloroethane-d4 453 450 101 74-135 <br /> 10 arrogate Toluene-d8 482 450 107 84-119 <br /> arrogate 4-Bromo luorobenzene 477 450 106 86-119 <br /> Batch 3080176-EPA 5030 waters <br /> Blank(3080176-BLKI) Prepared&Analyzed 08/11/03 <br /> Teri-amyl methyl ether ND 10 ug/l <br /> Benzene ND 050 <br /> Tert-butyl alcohol ND 20 " <br /> Di isopropyl ether ND 1 0 " <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 1 0 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 4 79 4 50 106 84-122 <br /> Surrogate 12-Dichloroethane-d4 4 72 450 105 74-135 <br /> Surrogate Toluene-d8 467 450 104 84-119 <br /> Surrogate 4-BromoJluorobenzene 451 4 50 100 86-119 <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 basis <br /> This analytical report must be reproduced in its entirety <br /> Page 17 of 19 <br />