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(D (65Sequoia 1551 nal Road <br /> San Carlos <br /> CA 94070 <br /> 14W Analytical <br /> 0)2329600 <br /> FAX(650)232-9612 <br /> www sequoialabs com <br /> Gettler-Ryan/Geostrategies(1) Project Tosco(l) <br /> 6747 Sierra Court,Suite 3 Project Number Tosco(Unocal)SS#6981,Stockton Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 05/07/02 12 56 <br /> Total Purgeable Hydrocarbon (C6-C12) by EPA-8015M and BTEXIMTBE by EPA 8021B- Quality Control <br /> _ Sequoia Analytical - San Carlos <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2040002- EPA 5030B(P/T) <br /> Blank(2040002-BLKI) Prepared&Analyzed 04/01/02 <br /> Purgeable Hydrocarbons as Gasoline ND 50 ug/l. <br /> Benzene ND 050 " <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Methyl tert-butyl ether ND 50 " <br /> Surrogate a a,a-Trifluorotoluene 966 100 966 70-130 <br /> LCS(2040002-BS1) Prepared&Analyzed 04/01/02 <br /> Benzene 877 050 ug/l 100 877 70-130 <br /> Toluene 862 050 100 862 70-130 <br /> Ethylbenzene 924 050 100 924 70-130 <br /> Xylenes(total) 277 050 300 923 70-130 <br /> Surrogate a a a-Trrfluorotoluene 885 100 885 70-130 <br /> LCS(2040002-BS2) Prepared&Analyzed 04/01/02 <br /> Purgeable Hydrocarbons as Gasoline 269 50 ugll 250 108 70-130 <br /> Surrogate a,a,a-Tris luorotoluene 911 11100 911 70-130 <br /> Matrix Spike(2040002-MSI) Source L203104-11 Prepared&Analyzed 04/01/02 <br /> Purgeable Hydrocarbons as Gasoline 252 50 ug/1 250 ND 101 60-140 <br /> Surrogate a a a-Tris luorotoluene 115 100 115 70-130 <br /> Matrix Spike Dup(2040002-MSDI) Source L203104-11 Prepared&Analyzed 04/01/02 <br /> Purgeable Hydrocarbons as Gasoline 259 50 ug/l 250 ND 104 60-140 274 25 <br /> Surrogate a a a-Trifluoroicluene 112 100 111 70-130 <br /> Sequoia Analytical- San Carlos The results in this report apply to the samples analyzed in accordance with the chain <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 15 of 20 <br />