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a— ) + 1455 McDowell lNorth Ste D <br /> Sequoila etaluu ma,CA 94954 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project BP Heritage Site 11191,Stockton,Ca P410091 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36368 Reported <br /> Sacramento CA,95833 Project Manager Vemon P Elarth 10/15/04 15 22 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spice Source °/0REC RPD <br /> Analyte Result limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4100304-EPA 5030B waters/EPA 8260B <br /> Blank(4100304-BLKI) Prepared&Analyzed 10/13/04 <br /> Teri-amyl methyl ether ND 10 ug/I <br /> Benzene ND 050 " <br /> Tert-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 1 0 " <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 531 500 106 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 544 500 109 74-135 <br /> *Surrogate Toluene-d8 575 I, 500 115 84-119 <br /> Surrogate 4-Bromofluorobenzene 5 17 500 103 86-119 <br /> Laboratory Control Sample(4100304-BS 1) Prepared&Analyzed 10/13/04 <br /> Tert-amyl methyl ether 554 10 up/] 500 111 78-117 <br /> Benzene 547 050 " Soo 109 81-118 <br /> Tert-butyl alcohol 826 20 100 83 60-147 <br /> Di-isopropyl ether 526 1 0 500 105 70-125 <br /> Ethanol 108 100 100 108 55-200 <br /> Ethylbenzene 530 050 500 106 89-122 <br /> Ethyl tert-butyl ether 548 10 500 110 71-120 <br /> Methyl tert-butyl ether 605 050 500 121 70-122 <br /> Toluene 528 050 500 106 84-119 <br /> Xylenes(total) 160 0 50 150 107 86-132 <br /> Surrogate Dibromofluoromerhane 545 500 109 84-122 <br /> Surrogate 12-Dichloroethane-d4 533 500 107 74-135 <br /> Surrogate Toluene-d8 584 500 117 84-119 <br /> Surrogate 4-Bromofluorobenzene 519 500 104 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 10 of 12 <br />