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1551 Industrial Road <br /> Sequoia SanCarlosCA94070 <br /> *W 4Analytical (650)232-9600 <br /> FAX(650)232-9612 <br /> www sevoialabs com <br /> Gettler-Ryan/Geostr3tegies(1) Project Tosco(1) <br /> 6747 Sierra Court Suite J Project Number Tosco(Unocal)SS#6981 Stockton, CA Reported <br /> Dublin CA, 94568 Project Manager Deanna Harding 09/27/01 10 19 <br /> _= Volatile Organic 8 Oxygenaled Compounds-by-EPA Method 8260B - Quality-Control - <br /> Sequola Analytical - San Carlos <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 1090069-EPA 5030B JP/'Tl - <br /> Blank(1090069-BLK1) Prepared&Analyzed 09/19/01 <br /> Surrogate Toluene-d8 504 u9/1 500 101 88-110 <br /> LCS(1090069-BSI) Prepared&Analyzed 09/19/01 <br /> Methvl terl-butyl ether 492 20 ug/l 500 984 70-130 <br /> Surrogate 12-Dichloroethone-d4 48 7 500 974 76-114 <br /> Surrogate Toluene-d8 496 500 992 88-110 <br /> Matrix Spike(1090069-MSI) Source L109093-03 Prepared&Analyzed 09/19/01 <br /> Methyl tert butyl ether 496 20 ug/l Soo ND 992 60-140 <br /> Surrogate 12-Dtchloroethane-d4 311 500 102 76-114 <br /> Surrogate Toluene-d8 301 500 100 88-110 <br /> Matrix Spike Dup(1090069-MSDI) Source L109093-03 Prepared&Analyzed 09/19/01 <br /> Methyl terl-butyl ether 523 20 ug/l Soo ND 105 60-140 530 25 <br /> Surrogate 1,2-Dichloroethane-d4 51 7 500 103 76-114 , <br /> Surrogate Toluene-d8 491 500 982 88-110 <br /> Batch 1090075- EPA 5030E IP/TJ <br /> Blank (1090075-BLK1) Prepared&Analyzed 09/20/01 <br /> Ethanol ND 1000 ug/l <br /> 1,2-Dibromoethane ND 20 " <br /> 1,2-Dichloroethane ND 20 <br /> Di-isopropyl ether ND 20 " <br /> Ethyl ten-butyl ether ND 20 <br /> Methyl tert-butyl ether ND 20 " <br /> 'Pert-amyl methyl ether ND 20 " <br /> Teri-butyl alcohol ND 100 " <br /> Surrogate 12-Dichloroethane-d4 471 500 942 76-114 <br /> Surrogate Toluene-0 516 500 103 88-110 <br /> Sequoia Analytical-San Carlos The results in this report apply to the samples analyzed to accordance With the chain <br /> custody document This analytical report must be reproduced to its entirety <br /> Page 18 of 21 <br />