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1 <br /> Sequoia 1551 al Road <br /> San Cararloslos C0 <br /> (650)23 2-960-9600 <br /> WO Analytical FAXequoi labsc 12 <br /> w www sequaialabs eom <br /> *r-Ryan/GeostrateRIeS(J) Project Tosco(1) <br /> Sierra Court,Suite J Project Number Tosco(Unocal)SS#6981,Stockton,CA Reported <br /> Dublin CA,94568 Project Manager Deanna}-larding 12/27/0109 39 <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 1120090-EPA 5030B IP/TJ _ <br /> Blank(I 120090-BLKI) Prepared&Analyzed 12/21/01 <br /> Ethanol ND 500 u9/1 <br /> 1,2-Dibromoethane ND 10 " <br /> 1,2-Dichloroethane ND 10 " <br /> Di-isopropyl ether ND 10 " <br /> Ethyl ten-butyl ether ND 10 " <br /> Methyl tert-butyl ether ND 10 " <br /> Teri-amyl methyl ether ND 10 " <br /> Tert-butyl alcohol ND 20 " <br /> Surrogate 1,2-Dichloroethane-d4 437 500 914 70-130 <br /> Surrogate Toluene-d8 512 500 102 70-130 <br /> Blank(1120090-BLK2) Prepared&Analyzed 12/26/01 <br /> Ethanol ND 500 ugn <br /> iromoethane ND 10 " <br /> I,c chloroethane ND 10 " <br /> Di-isopropyl ether ND 10 " <br /> Ethyl tert-butyl ether ND 1 0 <br /> Methyl tert-butyl ether ND 1 0 <br /> Teri-amyl methyl ether ND 10 " <br /> Tert-butyl alcohol ND 20 " <br /> Surrogate 1,2-Dichloroethane-d4 448 500 896 70-130 <br /> Surrogate Toluene-d8 317 500 103 70-130 <br /> LCS(1120090-BS1) Prepared&Analyzed 12/21/01 <br /> Methyl tert-butyl ether 579 10 ugA 500 116 70-130 <br /> Surrogate 1 2-Dichloroethane-d4 464 500 928 70-130 <br /> Surrogaie Toluene-d8 554 500 111 70-130 <br /> S a Analytical-San Carlos The results in this report apply to the samples onalyred in accordance with the chain of <br /> custody,document This analytical report must be reproduced in its entirety <br /> Page 20 of 22 <br />