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It <br /> Sequoia Innl I losC al Road <br /> 5aa,Carlo,:CA 94070 <br /> mW Analytical www (6s0)2ebsco0 <br /> FAX(650)232-9612 <br /> wxquoiaJetn cone <br /> Gettler-Ryan/Geostratcgies(1) Project Tosco(1) <br /> 6747 Sierra Court,Suite 3 Project Number Former Unocal SS#4409,Stockton,CA ReporteE39 Dublin CA,94568 Project Manager' Deanna Harding 10/26/0109 <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 Limits RPD Limit Notts <br /> Batch ]100051 -EPA 5030D IP/T] <br /> Blank(1100051-BLKI) Pre2ared&Analyzed 10/11/01 ` <br /> Ethanol ND 1000 ugll <br /> 1,2-Dibromoethane ND 20 " <br /> 1,2-Dichloroethsne ND 20 " <br /> Di-isopropyl ether ND 20 <br /> Ethyl tert-butyl ether ND 20 " <br /> Methyl tert-butyl ether ND 20 " <br /> Tert-amyl methyl ether ND 20 " <br /> Tert-butyl alcohol ND 100 " <br /> Surrogate 1,2-Dichloroethaned4 304 500 101 76-114 <br /> Surrogate Toluene-d8 502 500 100 88-110 <br /> Blank(1100051-BLK2) Prepared&Analyzed 10/15/01 - <br /> Ethanol ND 3000 ug/l <br /> 1,2-Dlbramoethane ND 20 <br /> 1,2-Diddoroethane ND 20 " <br /> Di-isopropyl ether ND 20 " <br /> Ethyl tart-butyl ether ND 20 " <br /> Methyl tart-butyl ether ND 20 " <br /> Tert-amyl methyl ether ND 20 " <br /> Tert-butyl alcohol ND 100 " <br /> Surrogate 42 Dichloroethaned4 519 500 104 76-114 <br /> Surrogare Toluene-d8 525 Soo 105 88-110 <br /> LCS(1100051-BSI) Prepared&Analyzed 10/11/01 <br /> Methyl tert-butyl ether 515 20 ug/l Soo 103 70-130 <br /> Sr"Wie 1,1-Dichloroethaned4 502 500 100 76-114 <br /> Surrogate Toluene-d8 479 Soo 958 88-110 <br /> Sequoia Analytical-San Carlos The results m this report apply to the samples analyzed in accordance with the chain of <br /> custody document 77us analytical report must be reproduced in its entirety <br /> Page 13 of 16 <br />