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a— ) Sequoia 1455McDowePlleSi�a,CA949 4(707)792-1865 <br /> Analytical PAX(707)792-0342 <br /> www sequotalabs corn <br /> URS Corp-Sacramento Project BP Heritage Site 11194,Tracy,Ca P404694 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number VM6365 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 J cvel Result %REC Limits RPD buil Notes <br /> Batch 4050263-EPA 5030B waters <br /> Laboratory Control Sample(4050263-BSI) Prepared 05/11/04 Analyzed 05/12/04 <br /> Tert-amyl methyl ether 540 10 ugA 500 108 78-117 <br /> Benzene 528 050 500 106 81-118 <br /> Tert-butyl alcohol 104 20 100 104 60-147 <br /> Di-isopropyl ether 526 10 500 105 70-125 <br /> Ethanol 970 100 100 97 55-200 <br /> Ethylbenzene 499 050 500 100 89-122 <br /> Ethyl tert-butyl ether 539 10 500 108 71-120 <br /> Methyl cert-butyl ether 534 050 500 107 70-122 <br /> Toluene 515 050 500 103 84-119 <br /> Xylenes(total) 154 050 150 103 86-132 <br /> Surrogate Dibromofluoromethane 496 500 99 84-122 <br /> W <br /> rrogate 1 2-Dichloroethane-d4 546 500 109 74-135 <br /> rrogate Toluene-d8 519 500 104 84-119 <br /> Matrix Spike(4050263-MSI) Source P404694-11 Prepared 05/11/04 Analyzed 05/12/04 <br /> Tert-amyl methyl ether 538 10 ug/l 500 ND 108 78-117 <br /> Benzene 5 37 050 500 ND 107 81-118 <br /> Tert-butyl alcohol 108 20 100 ND 108 60-147 <br /> Di-isopropyl ether 5 34 10 500 ND 107 70-125 <br /> Ethanol 993 100 100 ND 99 55-200 <br /> Ethylbenzcne 504 050 500 ND 101 89-122 <br /> 5thyl tent-butyl ether 567 to 500 ND 113 71-120 <br /> Methyl tert-butyl ether 569 050 500 026 109 70-122 <br /> Toluene 517 050 500 ND 103 84-119 <br /> Xylenes(total) 15 8 050 150 ND 105 86-132 <br /> Surrogate Drbromofduoromethane 538 500 108 84-122 <br /> Surrogate 12-Dichtoroethane-d4 579 300 116 74-135 <br /> Surrogate Toluene-d8 533 500 107 84-119 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed rn 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 /> I <br /> Page 16 of 21 <br />