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1455 McDowell Blvd,North Ste D <br /> 4DSequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> Analytical FAX equot labs c 42 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project BP Heritage Site 11191,Stockton,Ca P404678 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36368 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 05/27/04 15 02 <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 4050263-EPA 5030B waters <br /> Matrix Spike Dup(4050263-MSD1) Source P404694-11 Prepared 05/11/04 Analyzed 05/12/04 <br /> Tert-amyl methyl ether 554 10 ug/l Soo ND ill 78-117 3 20 <br /> Benzene 549 050 Soo ND 110 81-118 2 20 <br /> Tert-butyl alcohol 112 20 t00 ND 112 60-147 4 20 <br /> Di-isopropyl ether 562 10 500 ND 112 70-125 5 20 <br /> Ethanol 105 100 100 ND 105 55-200 6 20 <br /> Ethylbenzene 5 25 050 500 ND 105 89-122 4 20 <br /> Ethyl tert-butyl ether 596 10 500 ND 117 71-120 3 20 <br /> Methyl tert-butyl ether 596 050 500 026 114 70-122 5 20 <br /> Toluene 542 050 500 ND 108 84-119 5 20 <br /> Xylenes(total) 165 050 15 0 ND 110 86-132 4 20 <br /> Surrogate Dibromofluoromeihane 529 500 106 84-122 <br /> Surrogate 12-Dichloroethane-d4 583 Soo 117 74-135 <br /> 0709"te Toluene-d& 519 500 104 84-119 <br /> I <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 13 of 14 <br />