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885 Jarvis Dr <br /> a— ) Sequoia Morgan Hill,CA 95037 <br /> iW Analytical FAX(408) <br /> www sequoialabs corn <br /> Stratus Environmental Inc Project ARCO#2186,Stockton,CA MMC0508 <br /> 3330 Cameron Park Dr,Suite 550 Project Number ARCO#2186,Stockton,CA Reported <br /> Cameron Park CA,95682 Project Manager Jay Johnson 03/27/03 17 13 <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 3C22018-EPA 5030B P/T <br /> Blank(3C22018-BLKlPrepared 03/22/03 Analyzed 03/23/03 <br /> Methyl tert-butyl ether ND 0 50 ug/1 <br /> Di-isopropyl ether ND 050 " <br /> Ethyl tert-butyl ether ND 050 " <br /> tert-Amyl methyl ether ND 050 " <br /> 1,2-Drchloroethane ND 050 " <br /> 1,2-Drbromoethane(EDB) ND 0 50 " <br /> Surrogate 1 2-Drchloroethane-d4 486 500 972 78-129 <br /> Laboratory Control Sample(3C22018-BSI) Prepared&Analyzed 03/22/03 <br /> Methyl tert-butyl ether 9 13 050 ug/l 100 91 3 63-137 <br /> 0urrogate 1 2-Drchloroethane-d4 482 " 5 00 964 78-129 <br /> Laboratory Control Sample 3C22018-BS2 Prepared 03/22/03 Analyzed 03/23/03 <br /> Methyl tert-butyl ether 8 17 050 119/1 9 04 904 63-137 <br /> Surrogate 1,2-Drchloroethane-d4 4 73 115 00 94 6 78-129 <br /> G/ js S VV4-2-S <br /> Matrix Spike 3C22018-MSI �t Source N MC0508-09 Prepared 03/22/03 Analyzed 03/23/03 <br /> Methyl tert-butyl ether 659 10 ug/l 181 530 71 3 63-137 'QM-07) <br /> Surrogate 1 2-Drchloroethane-d4 4 74 5 00 948 78-129 <br /> Matrix Spike Du (3C22018-MSD1) Source MMC0508-09 Prepared 03/22/03 Analyzed 03/23/03 <br /> Methyl tert-butyl ether 642 10 119/1 181 530 63 9 63-137 261 13 QM-07 <br /> Surrogate 12-Dtchloroethane-d4 4 77 5 00 954 78-129 <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 wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> 16 of 17 <br />