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1551 Carlos <br /> IndustrialRoad <br /> � Sequoia San LarioloCAs CA 94070 <br /> Analytical (650)232-9600 <br /> FAX <br /> � (650)232 9612 <br /> www sequoialabs coin <br /> ler-Ryan/GeOStrategles(1) Project Tosco(1) <br /> Sierra Court,Suite J Project Number Unocal SS#08671,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 2020054-EPA 5030B P/T <br /> Blank(2020054-BLKI) _ Prepared&Analyzed 02/15/02 <br /> Ethanol ND 500 ug/l <br /> 1,2-Dibromoethane ND 1 0 " <br /> 1,2-Dichloroethane ND 1 0 " <br /> Di-isopropyl ether ND 1 0 " <br /> Ethyl tert-butyl ether ND 1 0 " <br /> Methyl tert-butyl ether ND 1 0 " <br /> Teri-amyl methyl ether ND 1 0 " <br /> Tert-butyl alcohol ND 20 " <br /> Surrogate 1,2-Dichloroethane-d4 549 500 110 70-130 <br /> Surrogate Toluene-d8 497 500 994 70-130 <br /> Blank(2020054-BLK2) Prepared&Analyzed 02/19/02 <br /> Ethanol ND 500 ug/l <br /> 1romoethane ND 1 0 " <br /> 1, chloroethane ND 1 0 " <br /> Di-isopropyl ether ND 1 0 <br /> Ethyl tert-butyl ether ND 1 0 " <br /> Methyl tert-butyl ether ND 1 0 " <br /> Tert-amyl methyl ether ND 1 0 " <br /> Tert-butyl alcohol ND 20 " <br /> Surrogate 1,2-Dichloroethane-d4 530 500 106 70-130 <br /> Surrogate Toluene-d8 479 500 958 70-130 <br /> LCS (2020054-BSI) Prepared&Analyzed 02/15/02 <br /> Methyl Cert-butyl ether 47 8 1 0 ug/l 500 95 6 70-130 <br /> Surrogate 1,2-Dichloroethane-d4 59 7 500 119 70-130 <br /> Surrogate Toluene-d8 483 500 966 70-130 <br /> S*a Analytical - San Carlos The results in this r eport apply to the samples analyzed in accordance with the chain <br /> of custody document This analytical t epoi t must be rept oduced in its entirety <br /> Page 8 of 16 <br />