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b <br /> 1551 Indusinal Road <br /> (1) Sequoia San Carlos CA 94070 <br /> (650)232-9600 <br /> Analytical FAX(650)232 9612 <br /> www sequoialabs tram <br /> ler-Ryan/GeostrateRies(1) Project Tosco(1) <br /> 7 Sierra Court,Suite J Project Number Unocal SS#08671 Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 05121/02 13 26 <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 2050016-EPA 5030B (P/Tl <br /> Blank(2050016-BLKI) Prepared&Analyzed 05/08/02 <br /> Ethanol ND 500 ug/l <br /> 1,2-Dibromoethane ND 20 " <br /> 1,2-Dichloroethane ND 20 " <br /> Di-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-Dichloroethane-d4 521 500 104 70-130 <br /> Surrogate Toluene-d8 500 500 100 70-130 <br /> Blank(2050016-BLK2) Prepared&Analyzed 05/10/02 <br /> Ethanol ND 500 ug/l <br /> Ibromoethane ND 20 <br /> ichloroethanc ND 20 " <br /> Di-isopropyl ether ND 20 " <br /> Ethyl tert-butyl ether ND 20 " <br /> Methyl tert-butyl ether ND 20 " <br /> Teri-amyl methyl ether ND 20 " <br /> Teri-butyl alcohol ND 100 " <br /> Surrogate 1 1-Dichloroethane-d4 491 500 981 70-130 <br /> Surrogate Toluene-d8 474 500 948 70-130 <br /> Blank(2050016-BLK3) Prepared&Analyzed 05/13/02 <br /> Ethanol ND 500 ug/l <br /> 1,2-Dibromoethane ND 20 " <br /> 1,2-Dichloroethane ND 20 " <br /> Di-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 /> Teri-butyl alcohol ND 100 " <br /> Surrogate 12-Dichloroethane-d4 488 500 976 70-130 <br /> Surrogate Toluene-d8 482 500 964 70-130 <br /> is Analytical - San Carlos The results in this report apply to the samples analyzed in accordance wrth the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 8 of 13 <br />