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Sequoia 685 Jarvis Dr <br /> MorgaaHill,CA45037 <br /> 6�1 9600 <br /> Analytical c4OB>"6- <br /> FAX(408)782-63066308 <br /> www sequoialabs coir <br /> URS Cormoration F11 Project BP Hentage Site#11191,Stockton,CA MMC0165 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number BP Heritage Site#1]191,Stockton,CA Reported <br /> Sacramento CA,95833 Project Manager Vern Elarth 03/14/03 16 58 <br /> GasolinelBTEMOxygenates by EPA method 8260B- Quality Control <br /> Sequoia Analytical-Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3030112-EPA 5030E IP/Tl <br /> Matrix Spike Du (3030112-MSDI) Source 5302639-02 Prepared 03/07/03 Analyzed 03/10/03 <br /> Methyl tert-butyl ether 0 0429 0 0050 mg/kg 0 0448 ND 96 60-140 02 25 <br /> Benzene 00203 0 0050 00272 ND 75 60-140 2 25 <br /> Toluene 0 133 00050 0 167 ND 80 60-140 4 25 <br /> Gasoline(C6-C10) 1 30 1 0 2 20 ND 59 60-140 5 25 QM-07 <br /> Surrogate 12-DCA-d4 00456 00500 91 60-140 <br /> Surrogate Toluene-d8 00589 00500 118 60-140 <br /> Surrogate 4-BFB 00564 00500 113 60-140 <br /> �equoia Analytical-Morgan Hill 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 /> basis This analytical report must be reproduced in its entirety <br /> 7 of 9 <br />