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a <br /> Sequoia 1455 McDowell Blvd North Ste <br /> Petaluma CA 949544 <br /> (707)792 1865 <br /> Analytical FAX(707) labsco2 <br /> www sequoialabs coin <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P403188 <br /> 2870 Gateway Oaks Drive State 300 Project Number lntrim-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 04/12/04 10 17 <br /> Volatile Organic Compounds by EPA Method 8260B-Quality Control <br /> Sequoia Analytical -Petaluma <br /> Reporting Spike Source %RFC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4030564-EPA 5030B waters <br /> Blank(4030564-BLK1) Prepared&Analyzed 03/19/04 <br /> Surrogate Toluene-d8 413 ug/! 450 94 84-119 <br /> Surrogate 4-BromoJluorobenzene 404 450 90 86-119 <br /> Laboratog Control Sample(4030564-BSI) Prepared&Analyzed 03/19/04 <br /> Tert-amyl methyl ether 495 10 119/1 500 99 78-117 <br /> Benzene 5 17 050 500 103 81-118 <br /> Teri butyl alcohol 116 20 100 116 60-147 <br /> Di-isopropyl ether 536 10 500 107 70-125 <br /> 1,2-Dibromoethane(EDB) 508 050 500 102 85-125 <br /> 1,2 Dichloroethane 489 050 500 98 77-126 <br /> Ethanol 279 100 100 279 55-200 QC01 <br /> Ethylbenzene 526 050 500 105 89-122 <br /> yl tert-butyl ether 508 10 500 102 71-120 <br /> ethyl tert-butyl ether 505 050 500 101 70-122 <br /> Toluene 530 050 500 106 84 119 <br /> Xylenes(total) 163 050 150 109 86-132 <br /> Surrogate Dtbromofluoromethane 410 450 93 84-121 <br /> Surrogate 12-Dichloroethane-d4 423 450 94 74-135 <br /> Surrogate Toluene-d8 431 450 96 84-119 <br /> Surrogate 4-Bromofluorobenzene 421 450 94 86-119 <br /> Laboratory Control Sample Dup(4030564-BSDI) Prepared&Analyzed 03/19/04 <br /> Tert amyl methyl ether 5 17 10 ug/I 500 103 78-117 4 20 <br /> Benzene 5 58 050 500 112 81-118 6 20 <br /> Tert-butyl alcohol 117 20 100 117 60 147 09 20 <br /> Di-isopropyl ether 543 1 0 500 109 70-125 1 20 <br /> 1,2-Dibromoethane(EDB) 5 17 050 500 103 65-125 2 20 <br /> 1,2-Dichloroethane 529 050 500 106 77-126 8 20 <br /> Ethanol 182 100 100 182 55-200 42 20 QC20 <br /> Ethylbenzene 533 050 500 107 89-122 1 20 <br /> Ethyl tert butyl ether 527 1 0 500 105 71-120 4 20 <br /> Methyl tert-butyl ether 532 050 500 106 70-122 5 20 <br /> Toluene 537 050 500 107 84-119 1 20 <br /> Xylenes(total) 162 050 150 108 86-132 06 20 <br /> Surrogate Dibromofluoromethane 425 450 94 84-122 <br /> Surrogate 12 Dichloroethane-d4 423 450 94 74-135 <br /> Surrogate Toluene-d8 442 450 98 84-119 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed to 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 31 of 34 <br />