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Sequoia 1551 Industrial Road <br /> San Carlos CA 94070 <br /> Analytical (650)232-9600 <br /> FAX(650)232-9612 <br /> www.sequoialabs.com <br /> #'ettler-Ryan/Geostratel;ies(1) Project: Tosco(I) <br /> s 9747 Sierra Court,Suite J Project Number: Tosca#1 l 195 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 2B]8003-EPA 5030B PIT <br /> Blank(2B]8003-BLKI) _ Prepared&Analyzed:0.2/_18102 <br /> Purgeable Hydrocarbons(C6-C12) ND 50 ug/l - - <br /> Benzene ND 0.50 " <br /> Toluene ND 0.50 " <br /> Ethylbenzene ND 0.50 <br /> Xylenes(total) ND 0.50 " <br /> Methyl tern-butyl ether(MTBE) ND 2.5 " <br /> Surrogate:a,a,a-Tiifluorotoluene 33.3 30.0 111 70-130 <br /> Blank(2B18003-BLK2) - Prepared&Analyzed:0211_9/02 _ <br /> Purgeable Hydrocarbons(C6-C12) ND 50 ug/I <br /> Benzene ND 0.50 " <br /> Toluene ND 0.50 " <br /> Ethylbenzene ND 0.50 " <br /> s'-ones(total) ND 0.50 " <br /> _ ilyl tert-butyl ether(MTBE) ND 2.5 of <br /> Surrogate:a,a,a-Tiifluorotoluene 33.1 30.0 110 70-130 <br /> Blank(2B]8003-BLK3) Prepared&Analyzed: 02/20/02_ <br /> Purgeable Hydrocarbons(C6-C72) ND 50 ug/I <br /> Benzene ND 0.50 " <br /> Toluene ND 0.50 <br /> Ethylbenzene ND 0.50 <br /> Xylenes(total) ND 0.50 " <br /> Methyl tert-butyl ether(MTBE) ND 2.5 " <br /> Surrogate:a,a,a-Trifluorotoluene 31.6 30.0 105 70-130 <br /> LCS(2B]8003-BSI) Prepared&Analyzed:02/18/02 <br /> Benzene 18.4 0.50 u911 ^ 20.0 92 70-130 <br /> Toluene 18.6 0.50 20.0 93 70-130 <br /> Ethylbenzene 19.2 0.50 20.0 96 70-130 <br /> Xylenes(total) 58.7 0.50 60.0 98 70-130 <br /> Surrogate:a,a,a-Tr1fluorotoluene 31.2 30.0 107 70-130 <br /> S -LAnalytical-San Carlos 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 15 of 17 <br />