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1551 Industrial Road <br /> Sequoia San Cados CA)232-9 )0 <br /> (650)232-9600 <br /> FAX(650)232-9612 <br /> Analytical www sequoialabs cam <br /> er-Ryan/Geostrategies(1) Project Tosco(1) <br /> Sierra Court,Suite J Project Number Tosco(Unocal)SS#6981,Stockton Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 05/07/02 12 56 <br /> Volatile Organic 8 Oxygenated Compounds by EPA Method 8260D- 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 2030068-EPA 5030B JP/Tl <br /> LCS(2030068-BS2) Prepared&Analyzed 03/26/02 <br /> Methyl tert-butyl ether 533 20 ug/l 500 107 70-130 <br /> Surrogate 1 2-Drchloroethane-d4 510 300 101 70-130 <br /> Surrogate Toluene-d8 476 500 952 70-130 <br /> Matrix Spike(2030068-MSI) Source L203104-02 Prepared&Analyzed 03/25/02 <br /> Methyl tert-butyl ether 455 20 uf/l 500 ND 880 60-140 <br /> Surrogate 1 2-Dichloroethane-d4 611 500 112 70-130 <br /> Surrogate Toluene-d8 507 500 101 70-130 <br /> Matrix S ike Du (2030068-MSDI) Source L203104-02 Prepared&Analyzed 03/25/02 <br /> Methyl tert-butyl ether 461 20 uFA 500 ND 892 60-140 131 25 <br /> Surrogate 1 2-Drchloroethane-d4 603 500 121 70-130 <br /> Surrogate Toluene-d8 511 500 101 70-130 <br /> 2030071 -EPA 5030B JP/Tl <br /> low <br /> Blank(2030071-BLKI) Prepared&Analyzed 03/26/02 <br /> Ethanol ND 500 ug(I <br /> 1,2-Dibromoethane ND 20 " <br /> 1,2-Drchloroethane ND 20 " <br /> Do-isopropyl ether ND 20 " <br /> Ethyl tert-butyl ether ND 20 " <br /> Methyl tert-butyl ether ND 20 " <br /> Tert-amyl methyl ether ND 20 " <br /> Tert-butyl alcohol ND 100 " <br /> surrogate 12-Drchloroethane-d4 504 Soo 101 70-130 <br /> Surrogate Toluene-d8 495 500 990 70-130 <br /> is Analytical- San Carlos The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 18 of 20 <br />