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4D (91819 Striker Avenue,Suite 8 <br /> Sequoia Sacramento,CA 95834 <br /> Analytical FAX <br /> 6)921-9100 <br /> equoi 92 1 labs c 00 <br /> Iw www sequoialabs com <br /> SECOR International-Rancho Cordova Project TOSCO 11192,Stockton,CA <br /> 3017 Kilgore Road,Suite 100 Project Number N/A Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 12/18/01 18 10 <br /> Total Purgeable Hydrocarbons,BTEX and MTBE In Air(ppmv) by DHS LUPI'-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 1120107-EPA 5030B(PIT') <br /> Blank 1120107-BLK1) Prepared 12/06/00 Analyzed 12/06/01 <br /> Purgeable Hydrocarbons ND 2 8 ppmv -- - - <br /> Benzene ND 0 016 " <br /> Toluene ND 0 013 " <br /> Ethylbenzene ND 0 012 " <br /> Xylenes(total) ND 0 012 " <br /> Methyl tert-butyl ether ND 0 14 " <br /> Surrogate a a a-Trifluorotoluene 000182 000200 910 60-140 <br /> LCS(1120107-BS1) Prepared 12/06/00 Analyzed I2/06101 <br /> Surrogate a a a-Trrfluorotoluene 000200 ppmv 000200 100 60-140 <br /> LCS Dup(1120107-BSD!) Prepared 12/06/00 Analvzed 12/06/01 <br /> Surrogate a a a-Trifluorotoluene 000200 ppmv 000200 100 60-140 <br /> equoia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document This analytical report must be reproduced in its entirety <br /> Page Page 7 of 10 <br />