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Sequoia 1551 Industrial Road <br /> }. i San Carlos CA 94070 <br /> a- ) A n aly[.ic al (650)232-9600 <br /> L1 FAX(650)232-9612 , <br /> w ww.scquo ialabs.corn <br /> Gettler-Ryan/Geostrategies(1) Project: Tosco(1) ' , <br /> 6747 Sierra Court,Suite 1 Project Number: Tosco#11195 Reported: <br /> Dublin CA,94568 Project Manager: Deanna Harding 02/21/02 08:17 <br /> Total Purgeable Hydrocarbons (C6-C12), BTEX and MTBE by DHS LUFT- Quality Control <br /> Sequoia Analytical -Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2B18003-EPA 5030B P/T <br /> LCS(2B18003-BS2) Prepared&Analyzed: 02/19/02 <br /> Benzene 19.0 0.50 ugA 20.0 95 70-130 <br /> Toluene 19.0 0.50 20.0 95 70-130 <br /> Ethylbenzene 19.3 0.50 20.0 96 70-130 <br /> Xylenes(total) 60.2 0.50 60.0 100 70-130 <br /> Surrogate:a,a,a-Trifluorotoluene 31.3 " 30.0 104 70-130 <br /> LCS(2B18003-BS3) - Prepared&Analyzed: 02/20/02 <br /> Benzene 17.4 0.50 u9/1 20.0 87 70-130 <br /> Toluene 19.1 0.50 20.0 96 70-130 <br /> Ethylbenzene 19.8 0.50 20.0 99 70-130 <br /> Xylenes(total) 59.9 0.50 60.0 100 70-130 <br /> Surrogate:a,a,a-Trifluorotoluene 31.3 30.0 104 70-130 <br /> Matrix Spike(2B18003-MSI) Source:L202058-07 Prepared&Analyzed:02/19/02 y <br /> Benzene 18.6 0.50 ug/I 20.0 ND 93 70-130 <br /> Toluene 18.8 0.50 20.0 ND 94 70-130 <br /> Ethylbenzene 19.2 0.50 20.0 ND 96 70-130 <br /> Xylenes(total) 58.7 0.50 60.0 ND 98 70-130 <br /> Surrogate:a,a,a-Tr•ifluorotoluene 33.5 30.0 112 70-130 <br /> Matrix Spike Dup(2B18003-MSD1) Source:L202058-07 Prepared&Analyzed:02/19/02 <br /> Benzene 16.0 0.50 ugfl 20.0 ND 80 70-130 15 20 <br /> Toluene 17.6 0.50 20.0 ND 88 70-130 7 20 <br /> Ethylbenzene 18.6 0.50 20.0 ND 93 70-130 3 20 <br /> Xylenes(total) 54.6 0.50 60.0 ND 91 70-130 7 20 <br /> Surrogate:a,a,a-Tr•ifluor•ofoluene 29.9 30.0 100 70-130 <br /> Sequoia Analytical-San Carlos The results in this report apply to the samples analyzed in accordance with the ck," "s <br /> of custody document. This analytical r•epor•r must be reproduced in its entirety. <br /> Page 16 of 17 <br />