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V <br /> Sequoia 8Jarvis Dr <br /> S e Ol a Morgan Hill <br /> C 95037 <br /> (408)776-9600 <br /> Analytical FAX(408)7826308 <br /> FAX <br /> sequoralabscom <br /> Stratus Environmental Inc Project ARCO#6100,Tracy,CA MMC0896 <br /> 3330 Cameron Park Dr,Suite 550 Project Number Intrim-50733 Reported <br /> Cameron Park CA,95682 Project Manager Jay Johnson 04/08/03 07 40 <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 Limit Notes <br /> Batch 3D03043-EPA 5030B PIT <br /> Blank(3D03043-BLKl) Prepared&Analyzed 04/03/03 <br /> Ethanol ND 100 ug/l <br /> tert-Butyl alcohol ND 20 " <br /> Methyl tert-butyl ether ND 050 " <br /> Di-isopropyl ether ND 050 " <br /> Ethyl tert-butyl ether ND 050 <br /> tert-Amyl methyl ether ND 050 " <br /> 2-Dichloroethane ND 050 " <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> Surrogate 12-Drchloroethane-d4 475 500 950 78-129 <br /> Laboratory Control Sample(3D03043-BSI) Prepared&Analyzed 04/03/03 <br /> *ethyl tert butyl ether 863 050 ug/l 100 863 63-137 <br /> Surrogate 12-Drchloroethane-d4 476 500 952 78-129 <br /> 4' <br /> Laboratory Control Sample(3D03043-BS2) Prepared&Analyzed 04/03/03 <br /> Methyl tert-butyl ether 829 050 ug/l 904 91 7 63-137 <br /> Surrogate 1,2-Drchloroethane-d4 468 11 500 936 78-129 <br /> Matrix Spike(3D03043-MSI) Source MMC0896-02 Prepared 04/03/03 Analyzed 04/04/03 <br /> Methyl tert-butyl ether 7990 500 ug/l 9040 2800 574 63-137 QM-07 <br /> Surrogate 12 Drchloroethane d4 466 500 932 78-129 <br /> Matrix Spike Dup(3D03043-MSD/) Source MMC0896-02 Prepared 04/03/03 Analyzed 04/04/03 <br /> Methyl tert-butyl ether 8250 500 ug/l 9040 2800 603 63-137 320 13 QM-07 <br /> i <br /> Surrogate 1 2-Drchloroethane d4 465 500 930 78-129 <br /> 4 <br /> 1 <br /> Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed to accordance with the chain of <br /> custody document Unless otherwise stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> 7of8 <br />