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i <br /> Sequoia 1551 industrial Road <br /> 4DSan Carlos CA 94070 <br /> (650)232-9600 <br /> Analytical FAX(650)232-9612 <br /> www sequoialabs corn <br /> Gettler-Ryan/Geostrategies(I) Project Tosco(1) <br /> 6747 Sierra Court,Suite 7 Project Number Tosco(Unocal)SS#6981,Stockton Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 05/07/02 1151 <br /> Volatile Organic—8 Oxygenated Compounds by EPA Method 8260B - 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 2030071 -EPA 50308 [PIT] _ <br /> LCS(2030071-BS1) Prepared&Analyzed 03/26/02 . <br /> Methyl tert-butyl ether 533 20 ug/l 500 107 70-130 <br /> Surrogate 11 Dtchloroethane-d4 510 500 102 70-130 <br /> Surrogate Toluene-d8 476 500 951 70-130 <br /> Matrix Spike(2030071-MSI) Source L203104-16 Prepared&Analyzed 03/26/02 <br /> Methyl tert-butyl ether 82 1 20 ug/l Soo 36 922 60-140 <br /> Surrogate 12-Dtchloroethane-d4 494 500 988 70-130 <br /> Surrogate Toluene-d8 481 500 961 70-130 <br /> Matrix Spike Dup(2030071-MSDI) Source L203104-16 Prepared_&Analyzed 03/26/_02 <br /> Methyl tert-butyl ether 914 20 ug/1 Soo 36 111 60-140 107 25 <br /> Surrogate 1,2-Dtchloroethane-d4 337 500 107 70-130 <br /> Surrogate Toluene-d8 475 500 950 70-130 <br /> • <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 19 of 20 <br />