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f� <br /> 1551 industrial Road <br /> San C <br /> Seu of a arlos 0 <br /> tx� q (650)23 23 2-96-96 00 <br /> Analytical FAX(650)232-9612 <br /> w y www sequoialabs corn <br /> r-Ryan/GeoStrategies(l) Project Tosco(1) <br /> Sierra Court,Suite 3 Project Number Tosco(former BP)#11192,Stockton Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 03/01/02 13 39 <br /> Volatile Organic 8 Oxygenated Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - San Carlos <br /> Reporting Spike Source %REC RPD <br /> lAnaiyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2020079-EPA 5030B JP/TJ <br /> Blank(2020079-BLKI) Prepared&Analyzed 02/25/02 <br /> Surrogate Toluene-d8 496 ugll 500 996 70-130 <br /> LCS(2020079-BSI) Prepared&Analyzed 02/25/02 <br /> Methyl tent-butyl ether 479 1 0 ug/l 500 958 70-130 <br /> Surrogate 1 1-Dichloroethane-d4 513 500 103 70-130 <br /> Surrogate Toluene-0 510 500 101 70-130 <br /> Matrix Spike(2020079-MSI) Source L202120-12 Prepared&Analyzed 02/25/02 <br /> Methyl tert-butyl ether 507 1 0 ugA 500 ND 101 60-140 <br /> Surrogate 12-Dichloroethane-d4 516 500 103 70-130 <br /> Surrogate Toluene-d8 497 500 994 70-130 <br /> Matrix Spike Du (2020079-MSDI) Source L202120-12 Prepared&Analyzed 02/25/02 <br /> M 1 tert-butyl ether 499 1 0 ug/1 500 ND 998 60-140 159 25 <br /> are 1 2-Dichloroethane-d4 523 500 105 70-130 <br /> Surrogate Toluene-d8 503 500 101 70-130 <br /> to Analytical - Sat]Carlos The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 13 of 14 <br />