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885 Jarvis Dr <br /> Sequoia Morgan Hill,CA 95037 <br /> a_ _� <br /> Analytical (408)772-6300 <br /> FAX(408)762-6308 <br /> www semolalabs corr <br /> Stratus Environmental Inc Project ARCO 92186,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 3C21056-EPA 5030E PIT <br /> Blank 3C21056-BLK1 Prepared 03/21/03 Analyzed 03/22/03 <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 /> 1,2-Dichloroethane ND 050 " <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> Surrogate 1 2-Drchloroethane-d4 548 500 110 78-129 <br /> Laboratory Control Sample(3C21056-BSI) Prepared 03/21/03 Analyzed 03/22/03 <br /> 0ethyl tert-butyl ether 974 050 ug/l 100 97 4 63-137 <br /> Surrogate 1 2-Drchloroethane-d4 486 " 500 972 78-129 <br /> Laboratory Control Sample 3C21056-BS2 Prepared 03/21/03 Anal ed 03/22/03 <br /> Methyl tent-butyl ether 772 0 50 ug/l 904 85 4 63-137 <br /> Surrogate 12-Drchloroethane-d4 499 500 998 78-129 <br /> 14 MW � <br /> Matrix Spike 3C21056-MSI G1 Source MMC4508-01 Prepared 03/2I/03 Analyzed 03/22/03 <br /> Methyl tert-butyl ether 3420 50 ug/1 904 3200 243 63-137 QM-4X <br /> Surrogate 1,2-Drchloroethane-d4 515 " 500 103 78-129 <br /> Matrix S ike Du (3C21056-MSD/) Source MMC0508-01 Prepared 03/21/03 Analyzed 03/22/03 <br /> Methyl tert-butyl ether 3710 50 ug/l 904 3200 564 63-137 8 13 13 QM-4X <br /> Surrogate 1 2-Dichloroethane-d4 481 500 962 78-129 <br /> Batch 3C22003-EPA 5030B PIT <br /> Blank 3C22003-BLKl Prepared&Analyzed 03/22/03 <br /> Ethanol ND 100 ug/1 <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 he reproduced in its entirety <br /> 14 of 17 <br />