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885 Jarvis Dr <br /> Sequoia Morgan Hill,CA 95037 <br /> Anal tical (408)772-63°0 <br /> Y FAX(408)782-6308 <br /> www sequoialabs con <br /> URS Corporation f 11 Project BP Heritage Site#11191,Stockton,CA MMC0165 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number BP Hentage Site#11191,Stockton,CA Reported <br /> Sacramento CA,95833 Project Manager Vern Elarth 03/14/03 16 58 <br /> Gasohne\BTEMOxygenates 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/T] <br /> Blank(3030112-BLK2) Prepared&Analyzed 03/I0/03 <br /> Surrogate 4-BFB 00500 mg/kg 00500 100 60-140 <br /> Laboratory Control Sample 3030112-BS1 Prepared&Analyzed 03/07/03 <br /> Methyl tent-butyl ether 00434 00050 mg/kg 00448 97 60-140 <br /> Benzene 00264 0 0050 00272 97 70-130 <br /> Toluene 0 187 0 0050 0 167 I12 70-130 <br /> Gasoline(C6-C10) 209 1 0 220 95 70-130 <br /> Surrogate 1 2-DCA-d4 00476 00500 95 60-140 <br /> Surrogate Toluene-d8 00567 00500 113 60-140 <br /> Surrogate 4-BFB 00507 00500 101 60-140 <br /> Waboratory Control Sample 3030112-BS2 Prepared&Analyzed 03/10/03 <br /> Methyl tert-butyl ether 0 0440 00050 mg/kg 00448 98 60-140 <br /> Benzene 00274 0 0050 " 00272 101 70-130 <br /> Toluene 0 199 0 0050 0 167 119 70-130 <br /> Gasoline(C6-C10) 2 31 1 0 220 105 70-130 <br /> Surrogate 1 2-DCA-d4 00466 00500 93 60-140 <br /> Surrogate Toluene-d8 00573 00500 115 60-140 <br /> Surrogate 4-BFB 00510 00500 102 60-140 <br /> Matrix S ike 3030112-MSl Source 5302639-02 Prepared 03/07/03 Analyzed 03/10/03 <br /> Methyl tert-butyl ether 00428 00050 mg/kg 0 0448 ND 96 60-140 <br /> Benzene 00207 00050 0 0272 ND 76 60-140 <br /> Toluene 0 138 00050 0 167 ND 83 60-140 <br /> Gasoline(C6-C10) 1 37 1 0 220 ND 62 60-140 <br /> Surrogate 12-DCA-d4 00445 00.500 89 60-140 <br /> Surrogate Toluene-d8 00566 00500 113 60-140 <br /> Surrogate 4-BFB 00564 00500 113 60-140 <br /> equola 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 /> 6of9 <br />