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1455 McDowell Blvd,forth Ste <br /> Sequoia Petaluma,CA 949544 <br /> (D (70)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs corn <br /> URS Corp-Sacramento Project BP Hentage Site 11191,Stockton,Ca P304289 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36368 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 04/25/03 17 26 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical -Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Umts Level Result %REC Limits RPD Limit Notes <br /> Batch 3040597-EPA 5030 waters <br /> Blank(3040597-BLKI) Prepared&Analyzed 04/24/03 <br /> Methyl tent-butyl ether ND 050 ug/l <br /> Surrogate Dibromofluoromethane 418 500 84 84-122 <br /> Laboratory Control Sample(3040597-BSI) Prepared&Analyzed 04/24/03 <br /> Methyl tert-butyl ether 475 050 USA 500 95 79-118 <br /> Surrogate Dibromofluoromethane 485 500 97 84-122 <br /> Laboratory Control Sample Duni(3040597-BSD1) Prepared&Analyzed 04/24/03 <br /> Methyl tert-butyl etber 462 050 ug/l 500 92 79-118 3 20 <br /> urrogate Dibromofluoromethane 458 500 92 84-122 <br /> Batch 3040629-EPA 5030 waters <br /> Blank(3040629-BLKI) Prepared&Analyzed 04/24/03 <br /> Methyl tert-butyl ether ND 050 ug/1 <br /> Surrogate Dibromofluoromethane 967 100 99 84-122 <br /> Laboratory Control Sample(3040629-BS1) Prepared 04/24/03 Analyzed 04/25/03 <br /> Methyl tent-butyl ether 0 939 050 ug/I T ^100 94 - 79-118 -- <br /> Surrogate Dibromofluoromethane 464 500 93 84-122 <br /> i <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 /> I <br /> Page 9 of 10 <br />