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1551 Industrial Road <br /> ID Sequoia San Carlos CA 94070 <br /> (650)232-9600 <br /> - � Analytical FAX(650)232-9612 <br /> www sequoialabs cram <br /> ler-Ryan/Geostrategies(l) Project Unocal(4) <br /> Sierra Court, Suite J Project Number Former Unocal#2859,Stockton Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 05/30/02 14 17 <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 Lunit Units Level Result %REC Lunrts RPD Limit Notes <br /> Batch 2050035-EPA 5030BJP/TJ <br /> Blank(2050035-BLK1) Prepared&Analyzed 05/17/02 <br /> Ethanol ND 500 ug/1 <br /> 1,2-Dibromoethane ND 10 " <br /> 1,2-Dichloroethane ND 10 " <br /> Di-isopropyl ether ND 1 0 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyt tert-butyl ether ND 10 " <br /> Tert-amyl methyl ether ND 10 " <br /> Tert-butyi alcohol ND 20 " <br /> Surrogate 1,2-Dichloroethane-d4 529 500 106 70-130 <br /> Surrogate Toluene-d8 502 500 100 70-130 <br /> Blank(2050035-BLK2) Prepared&Analyzed 05/20/02 <br /> Ethanol ND _ 500 ug/l <br /> � <br /> brOmoethane ND 10 n <br /> chloroethane ND 10 <br /> Di-isopropyl ether ND 10 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Methyl tert-butyl ether ND 10 " <br /> Ten-amyl methyl ether ND 10 " <br /> Tert-butyl alcohol ND 20 " <br /> Surrogate 12-Drchloroethane-d4 496 500 992 70-130 <br /> Surrogate Toluene-d8 509 500 102 70-130 <br /> LCS(2050035-BSI) Prepared&Analyzed 05/17/_02_ <br /> Methyl tert-butyl ether 455 1 0 ug/l 500 910 70-130 -- <br /> Surrogate 1,2-Dichloroethane-d4 495 500 990 70-130 <br /> Surrogate Toluene-d8 531 500 106 70-130 <br /> S�la Analytical -Safi 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 18 of 20 <br />