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�i Road <br /> i <br /> Sequoia 1551 Carlos <br /> CA 94070 <br /> San Carlos 23 -9600 <br /> (550)232-9600 � <br /> 9612 <br /> Analytical FAX(65 oialab.co <br /> wwwsequoialabs.com ¢ <br /> Gell iCr-Ryan/Geostrategies(1) Project: Tosco(1) <br /> 6747 Sierra Court.Suite 3 Project Number: Unocal SS408671.Stockton,CA Reported: <br /> Dublin CA.94568 Project Manager: Deanna Harding 09/05/01 07:36 <br /> Volatile Organic 8 Oxygenated Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - San Carlos <br /> Reponing Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %PEC Limits RPD Limit Notes <br /> Balch 1080101 -EPA 5030B JP/T1 _ <br /> Blank(1080101-BLl{1) Prepared&Analyzed: 08/23/01 ! <br /> Ethanol ND 1000 ug11 <br /> 1,2-DlbrOmoethane ND 2.0 i <br /> 1,2-Dichloroethane ND 2.0 " <br /> Di-isopropyl ether ND 2.0 " <br /> I <br /> Ethyl ten-butyl ether ND 2.0 " <br /> Methyl ten-butyl ether ND 2.0 <br /> Teri-amyl methyl ether ND 2.0 " <br /> I <br /> Ten-butyl alcohol ND 100 <br /> Surrogate:l,2-Dichloroethane-d4 44.7 50.0 89.4 76-114 ' <br /> Surrogate:Toluene-d8 47.8 50.0 95.6 88-110 <br /> Blank(1080101-BLK2) Prepared&Analyzed:08/24/01 ! <br /> Ethanol ND 1000 ugll <br /> 1,2-Dibromoethane ND 2.0 <br /> 1,2-Dichloroethane ND 2.0 _ <br /> Di-isopropyl ether ND 2.0 " <br /> Ethyl ten-butyl ether ND 2.0 <br /> Methyl tert-butyl ether ND 2.0 " <br /> Teri-amyl methyl ether ND 2.0 <br /> Ten-butyl alcohol ND 100 <br /> Surrogate: l,2-Dichloroethane-d4 42.9 50.0 85.8 76-114 <br /> Surrogate:Toluene-d8 46.8 50.0 93.6 88-110 <br /> LCS(1080101-BS1) Prepared&Analyzed:08/23/01 <br /> Methyl teri-butyl ether 44,1 2.0 ug/I 50.0 88.2 70-130 <br /> Surrogate:1,2-Dichloroethane-d4 44.5 50.0 89.0 76-114 <br /> Surrogate:Toluene-d8 47.3 50.0 94.6 88-110 <br /> I <br /> I <br /> Sequoia Analytical - San Carlos The results in this report apply to the samples analyzed in accordance with the chain oj„, <br /> custody document, This analytical report must be reproduced in its entirety. <br /> I <br /> Page 8 of 10 <br />