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1551 Ial Road <br /> Sequoia San Carlosrlos CA 94070 <br /> a) (650)232-9600 <br /> jjW= <br /> Analytical FAX(650)232-9612 <br /> J www sequoialabs Com <br /> Gettler-RyanlGeostrateRies(1) Protect Tosco(l) <br /> 6747 Sierra Court,Suite J Projeci Number Tosco(Unocal)SS46981,Stockton,CA Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 12/27/01 0939 <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 1120078-EPA 5030E IP/TJ <br /> Blank(1120078-BLKI) Prepared&Analyzed 12/20/01 <br /> Ethanol ND 500 ugA <br /> 1,2-Dtbromoethane ND 10 " <br /> 1,2-Dichloroethane ND 10 " <br /> Di-isopropyl ether ND 10 " <br /> Ethyl tert-butyl ether ND 1 0 " <br /> Methyl tert-butyl ether ND 1 0 " <br /> Ten-amyl methyl ether ND 1 0 " <br /> Teri-butyl alcohol ND 20 " <br /> Surrogate 12-Dichloroethane-d4 419 500 838 70-130 <br /> Surrogate Toluene-d8 501 500 100 70-130 <br /> LCS(1120078-BSI) Prepared&Analyzed 12/20/01 <br /> Methyl ten-butyl ether 550 10 ug/l 500 -- - 110-- 70-130 <br /> Surrogate 1,2-Dichlorcethane-d4 435 500 870 70-130 <br /> Surrogate Toluene-d8 526 500 105 70-130 <br /> Matrix Spike(1120078-MSI) Source L112065-06 Prepared&Analyzed 12/20/41 �— <br /> Methyl tell-butyl ether 529 10 ug/l Soo ND 106 60-140 <br /> Surrogate 1 2-Dichloroelhane-d4 416 500 831 70-130 <br /> Surrogate,Toluene-d8 558 500 112 70-130 <br /> _Matrix Spike Dup(1120078-MSDI) Source L112065-06 Prepared&Analyzed 12/20/01 <br /> Methyl tett-butyl ether 541 10 ug/l Soo ND 108 60-140 1 87 25 <br /> Surrogate 1 2-Dichlorcethane-d4 412 500 844 70-130 <br /> Surrogate Toluene-d8 355 500 111 70-130 <br /> Batch 1120084- EPA 5030B IP/TI <br /> Blank (1120084-BLKI) Prepared& Analyzed 12/21/01 <br /> Ethanol ND 500 ug/l <br /> 1,2-Dibromoethane ND 10 " <br /> 1,2-Dichloroethane ND 10 " <br /> Di-isopropyl ether ND 1 0 " <br /> Ethyl ten-butyl ether ND 10 " <br /> Methyl Cert-butyl ether ND 10 " <br /> Teri-amyl methyl ether ND 10 " <br /> Teri-butyl alcohol ND 20 " <br /> Surrogate 1,2-Dichloroethane-d4 285 250 114 70-130 <br /> Sequoia Analytical-San Carlos The results in this report apply to the samples analyzed in accordance with the chain-AM <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 17 of 22 <br />