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Sequoia 1551 industrial Road <br /> 4DSan Carlos CA 94070 <br /> 14WAnalytical (650)2329600 <br /> FAX(650)232-9612 <br /> www sequoialabs Com <br /> Gettler-Ryan/Geostrategies(1) Project Tosco(1) <br /> 6747 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 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 2030068-EPA 5030B IP/TJ <br /> Blank(2030068-BLKI) Prepared&Analyzed 03/25/02 <br /> Ethanol ND 500 ugA <br /> 1,2-Dibromoethane ND 2 0 " <br /> 1,2-Dichloroethane ND 2 0 " <br /> Di-isopropyl ether ND 2 0 " <br /> Ethyl tent-butyl ether ND 2 0 " <br /> Methyl tent-butyl ether ND 2 0 " <br /> Tert-amyl methyl ether ND 2 0 " <br /> Tert-butyl alcohol ND 100 " <br /> Surrogate 11-Dichloroethane-d4 53 1 500 106 70-130 <br /> Surrogate Toluene-d8 484 500 968 70-130 <br /> Blank(2030068-BLK2) Prepared&Analyzed 03/26/02 <br /> Ethanol ND 500 ug/l <br /> 1,2-Dibromoethane ND 2 0 <br /> 1,2-Dnchloroethane ND 2 0 " <br /> Di-isopropyl ether ND 2 0 " <br /> Ethyl tert-butyl ether ND 2 0 " <br /> Methyl tert-butyl ether ND 2 0 " <br /> Tert-amyl methyl ether ND 2 0 " <br /> Tert-butyl alcohol ND 100 " <br /> Surrogate I 1-Dtchloroethane-d4 504 " 500 101 70-130 <br /> Surrogate Toluene-d8 495 500 990 70-130 <br /> LCS(2030068-BSI) Prepared&Analyzed 03/25/02 <br /> Methyl tert-butyl ether 44 7 2 0 ug/1 500 894 70-130 <br /> Surrogate 1,2-Dichloroethane-0 .547 500 109 70-130 <br /> Surrogate Toluene d8 474 500 948 70-130 <br /> Sequoia Analytical-San Carlos The results in this report apply to the samples analyzed in accordance with the chain o <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 17 of 20 <br />