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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> 1WAnalytical FAX(707)792-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project BP Heritage Site 11194,Tracy,Ca P305041 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36365 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 05/15/03 20 30 <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 3050376-EPA 5030 waters <br /> Blank(3050376-BLKI) _ Prepared&Analyzed 05/14/03 <br /> Methyl tert-butyl ether ND 050 u9/1 <br /> Surrogate Dabromofluoromeihane 537 500 107 84-122 <br /> Laboratory Control Sample(3050376-BSI) Prepared_&Analyzed 05/14/03 <br /> Methyl tert-butyl ether 1 07 0 50 ugA 1 00 107 79-118 <br /> Surrogate Debromofluoromelhane 519 500 104 84-121 <br /> Laboratory Control Sample Du (3050376-BSDI) Prepared&Analyzed 05/14/03 <br /> Methyl Cert-butyl ether 1 03 0 50 ug/1 1 00 103 79-118 4 20 <br /> arrogate Dibramofluoromethane 505 500 101 84-122 <br /> I <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document Unless otherwise stated results are reported on a wet weight <br /> bases This analytical report must be reproduced en its entirety <br /> Page 12 of 13 <br />