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1551 Industrial Road <br /> Sequoia Sen Carlos CA 90 <br /> {650}232-9609600 <br /> A <br /> FAX(650) -9612 <br /> nalytical <br /> www.sequoioialabs.com <br /> ''r-Ryan/Geostrate ies(1} Project: Tosco(1) <br /> 6747 Sierra Court, Suite J Project Number: UNOCAL SS411195.LATHROP,CA Reported: <br /> Dublin CA.94568 Project Manager: Deanna Harding 08/28/0) 07:22 <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 I080066-EPA 5030B IP/TJ <br /> Blank(1080066-BLK2) Prepared&Analyzed:08/15/01 <br /> Ethanol ND 1000 ugll <br /> 1,2-Dibromoethene 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 /> Teri-butyl alcohol ND 100 " <br /> Surrogate:1,2-Dichloroethane-d4 51.1 50.0 102 76-114 <br /> Surrogate:Toluene-d8 52.8 50.0 106 88-110 <br /> LCS(7080066-BSI) Prepared&Analyzed:08/14/01 <br /> Methyl ler(-butyl ether 50.0 2.0 ugll 50.0 100 70-130 <br /> Si, ate:1,2-Dichloroethane-d4 50.1 50.0 100 76-119 <br /> Surrogate: Toluene-d8 51.0 50.0 102 88-110 <br /> LCS(1080066-BS2) Prepared&Analyzed: 08115101 <br /> Methyl ten-butyl ether 49.5 2.0 ug/I 50.0 99.0 70-130 <br /> Surrogate:l,2-Dichloroethane-d4 51.3 " 50.0 103 76-114 <br /> Surrogate:Toluene-d8 53.2 rr50.0 106 88-110 <br /> Matrix Spike(1080066-MSI) Source: LIOSOSI-01 Prepared&Analyzed:08/15/01 <br /> Methyl len-butyl ether 51.1 2.0 ug/l 50.0 ND 102 60-140 <br /> Surrogate 1,2-Dichloroethane-d4 50.8 50.0 102 76-114 <br /> Surrogate:Toluene-d8 53.1 50.0 106 88-110 <br /> Matrix Spike Dup(1080066-MSDI) Source: LIOSOSI-01 Prepared&Analyzed:08/15/01 <br /> Methyl lert-butyl ether 54.3 2.0 ugil 50.0 ND 109 60-140 6,07 25 <br /> Surrogate:l,2-Dichloroethane-d4 52.1 50.0 104 76-114 <br /> Surrogate:Toluene-d8 54.1 50.0 108 88-110 <br /> S ;Jia Analytical- San Carlos The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document. This analytical report must be reproduced in its entirety. <br /> Page 17 of 22 <br />