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(D 1455 McDowell Blvd North Ste <br /> Sequoia Petaluma,CA 949544 <br /> (707)792-1865 <br /> Analytical <br /> FAX(707)792A342 <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 13 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 Lmas RPD limit Notes <br /> Batch 4050290-EPA 5030B waters <br /> Blank(4050290-BLK1) Prepared&Analyzed 05/12/04 <br /> Teri-amyl methyl ether ND 10 ug/I <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 " <br /> Drtsopropyl 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 Dibromofluoromethane 535 600 89 84-122 <br /> WSrrogate 12-Dichloroethane-d4 560 600 93 74-135 <br /> rrogate Toluene-0 581 600 97 84-JJ9 <br /> Laboratory Control Sample(4050290-BSI) Prepared&Analyzed 05/12/04 <br /> Tert-amyl methyl ether 5 13 10 ugll 500 103 78-117 <br /> Benzene 537 050 500 107 81-118 <br /> Tert-butyl alcohol H6 20 100 116 60-147 <br /> Di-isopropyl ether 486 10 500 97 70-125 <br /> Ethanol 106 100 100 106 55-200 <br /> Ethylbenzene 552 050 500 110 89-122 <br /> Ethyl tert-butyl ether 485 10 500 97 71-120 <br /> Methyl tert butyl ether 489 050 500 98 70-122 <br /> Toluene 506 050 Soo 101 84-119 <br /> Xylenes(total) 167 050 150 111 86-132 <br /> Surrogate Dthromofluoromethane 535 600 89 84-1.21 <br /> Surrogate 1 2-Dichloroeihane-d4 553 600 92 74-135 <br /> Surrogate Toluene d8 582 600 97 84-119 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the charm of <br /> • custody document Unless otherwise stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirely <br /> Page I9 of 21 <br />