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0455 McDowell lNorth Ste <br /> Sequoia Petaluma,CA 949544 <br /> IT) <br /> 865 <br /> 1W Analytical (707)792-0 <br /> FAX(707)792-0342342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project BP Hentage Site 11194,Tracy,Ca P401433 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36365 Reported <br /> Sacramento CA,95833 Project Manager Vcmon P Elarth 02/11/04 16 31 <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 Motes <br /> Batch 4020142-EPA 5030B waters <br /> Laboratory Control Sample Du (4020142-BSD1) Prepared&Anal zed 02/05/04 <br /> Tert-amyl methyl ether 5 54 1 0 ugll 500 ill 78-117 7 20 <br /> Benzene 5 55 0 50 500 111 81-118 2 20 <br /> Tert-butyl alcohol 113 20 100 113 60-147 6 20 <br /> Di-tsopropyl ether 597 1 0 5 00 119 70-125 4 20 <br /> Ethanol 134 100 100 134 55-200 7 20 <br /> Ethylbenzene 5 55 050 5 00 H] 89-122 0 5 20 <br /> Ethyl tert-butyl ether 5 41 1 0 5 00 108 71-120 5 20 <br /> Methyl tert-butyl ether 5 66 0 50 500 113 70-122 6 20 <br /> Toluene 543 0 50 5 00 109 84-119 5 20 <br /> Xylenes(total) 169 0 50 15 0 113 86-132 2 20 <br /> Surrogate Drbromofluoromethane 4 45 450 99 84-122 <br /> urrogate 12-Dichloroethane-d4 4 44 450 99 74-135 <br /> Surrogate Toluene-d8 458 450 102 84-119 <br /> Batch 4020167-EPA 5030B waters <br /> Blank 4020167-BLK1 Prepared&Analyzed 02/06/04 <br /> Ter-amyl methyl ether ND 1 0 119/1 <br /> Benzene ND 050 " <br /> Ter-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 0 50 " <br /> Ethyl tert-butyl ether ND 1 0 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromgfluoromethan e 590 600 98 84-122 <br /> Surrogate 1 2-Drchloroethane-d4 6 03 600 100 74-135 <br /> Surrogate Toluene-d8 601 600 100 84-119 <br /> SequoiaAnalytical-Petaluma The results in this report apply to the samples analyzed to accordance with the chain <br /> of custody document Unless otherwise stated results are reported on a wet weight <br /> basis This analytical report must be reproduced to its entirety <br /> Page IS of 18 <br />