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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> a— )� Analytical FAX(707)792-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project BP Heritage Site 11194,Tracy,Ca P404694 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36365 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 05/25/04 I3 28 <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 4050243-EPA 5030B waters <br /> Blank(4050243-BLKI) Prepared&Analyzed 05/11/04 <br /> Tert-amyl methyl ether ND 10 ug/E <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dtbromofluoromethane 441 450 98 84-122 <br /> All�arrogate I 1-Dichloroethane-d4 426 450 95 74-135 <br /> arrogate Toluene d8 447 450 99 84-119 <br /> Laboratory Control Sample(4050243-BSI) Prepared&Analyzed 05/11/04 <br /> Tert-amyl methyl ether 494 10 ug/l 500 99 78-117 <br /> Benzene 5 81 050 500 116 81-118 <br /> Teri-butyl alcohol 111 20 100 111 60-147 <br /> Di-isopropyl ether 572 10 Soo 114 70-125 <br /> Ethanol 180 100 100 180 55-200 <br /> Ethylbenzene 557 050 500 111 89-122 <br /> Ethyl tert butyl ether 5 34 10 500 107 71-120 <br /> Methyl tert-butyl ether 5 11 050 Soo 102 70-122 <br /> Toluene 587 050 Soo 117 84-119 <br /> Xylenes(total) 172 050 150 115 86-132 <br /> Surrogate Dibromofluoromethane 453 450 101 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 455 450 101 74-135 <br /> Surrogate Toluene-d8 456 450 101 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 14 of 21 <br />