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885 Jarvis Dr <br /> 4 ID Sequoia MorganHill,CA 95037 <br /> Analytical FAX(4408 78i 6 0008 <br /> www sequoialabs coir <br /> URS Corporation[11 Project ARCO#2093,Tracy,CA MMD0164 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number lntnm-50265 Reported <br /> Sacramento CA,95833 Project Manager Vern Elarth 04/16/03 08 39 <br /> Volatile Organic Compounds by EPA Method 8260B-Quality Control <br /> Sequoia Analytical-Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Lirmt Notes <br /> Batch 3DO9041-EPA 5030E P/T <br /> Blank 3D09041-13LKI Prepared&Analyzed 04/09/03 <br /> Ethanol ND 100 ug/l <br /> tert-Butyl alcohol ND 20 " <br /> Methyl tert-buty]ether ND 050 " <br /> Di-isopropyl ether ND 050 " <br /> Ethyl tett-butyl ether ND 050 " <br /> tert-Amyl methyl ether ND 050 " <br /> 1,2-Dichloroethane ND 050 " <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> Surrogate 12-Dschloroethane-d4 468 500 936 78-129 <br /> Laboratory Control Sample 3D09041-BSI) Prepared&Analyzed 04/09/03 <br /> ethyl tert-butyl ether 106 050 ugll 100 I06 63-137 <br /> Surrogate 12-Dichloroethane-d4 492 Soo 984 78-129 <br /> Laboratory Control Sample 3D09041-BS2 Prepared&Analyzed 04/09/03 <br /> Methyl tert-butyl ether 104 050 ug/1 904 115 63-137 <br /> Surrogate 12-Dichloroethane-d4 484 " 500 968 78-129 <br /> Matrix Spike 3D09041-MSI) Source MMD0164-02 Prepared&Analred 04/09/03 <br /> Methyl tert-butyl ether 500 2 5 ug/1 45 2 5 2 99 1 63-137 <br /> Surrogate 1 2-Dichloroethane-d4 485 " 500 970 78-129 <br /> Matrix Spike Du (3D09041-MSDI) Source MMD0164-02 Prepared&Analyzed 04/09/03 <br /> Methyl tert-butyl ether 51 2 2 5 ug/1 45 2 5 2 102 63-137 2 37 13 <br /> Surrogate 1 2-Dichloroethane-d4 492 500 984 78-119 <br /> Batch 3D10007-EPA 5030B P/T <br /> Blank(31310007-BLKI) Prepared&Analyzed 04/10/03 <br /> Ethanol ND 100 ugll <br /> Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document Unless otherwise stated results are reported on a wer weight <br /> basis This analytical report must be reproduced in its entirety <br /> 13 of 15 <br />