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Sequoia 1551 Industrial Road <br /> ,!I) San Carlos CA 94070 <br /> r Analytical. (650)232-9600 <br /> FAX(650)232-9612 <br /> www sequoialabs com <br /> ler-Ryan/Geostratep,ies(1) Project Tosco(1) <br /> 7 Sierra Court, Suite J Project Number Unocal SS#l08671,Stockton,CA Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 02/28/02 11 15 <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 2020057-EPA 5030B EP/TJ <br /> LCS(2020057-BSl) Pre ared&Analyzed 02/20/02 <br /> Methyl tert-butyl ether 41 7 1 0 ug/I 50 0 83 4 70-130 <br /> Surrogate 1 2-Dichloi oethane-d4 508 500 101 70-130 <br /> Surrogate Toluene-d8 509 500 101 70-130 <br /> Matrix Spike(2020057-MS1) Source L2_02081-19 Prepared&Analyzed 02/20/02 _ <br /> Methyl tert-butyl ether 42 8 1 0 ug11 500 1 2 83 2 60-140 <br /> Suri agate 1 1-Dichloroethane-d4 487 500 974 70-130 <br /> Surrogate Toluene-d8 504 500 101 70-130 <br /> Matrix Spike Dup (2020057-MSDI) Source L202081-19 _Prepared&Analyzed 02/20/02 <br /> Methyl tert-butyl ether 42 3 1 0 W 500 1 2 82 2 60-140 1 18 25 <br /> Surrogate 1 2-Dichloroethane-d4 498 500 996 70-130 <br /> Surt agate Toluene-d8 499 500 998 70-130 <br /> 2020060-EPA 5030B [P/TJ <br /> Blank(2020060-BLK1Z -- Prepared&Analyzed 02/19/02 <br /> Ethanol ND 500 ug/l <br /> 1,2-Dibromoethane ND I0 " <br /> 1,2-Dichloroethane ND 10 " <br /> Di-isopropyl ether ND 1 0 " <br /> Ethyl tert-butyl ether ND 1 0 " <br /> Methyl tent-butyl ether ND 1 0 " <br /> 'Pert-amyl methyl ether ND I 0 " <br /> Tert-butyl alcohol ND 20 <br /> Surrogate 1,1-Dichloi oethane-d4 588 500 118 70-130 <br /> Surrogate Toluene-d8 551 500 110 70-130 <br /> Oia Analytical- San Carlos The i esults in this repoi t apply to the samples analyzed in accordance with the chain <br /> ofcusiody document This analytical i epoit must be reproduced in its entirety <br /> Page 10 of 16 <br />