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885 Jarvis <br /> 4D (40Sequoia 95 <br /> Mag�n Hdl,CA 9543377 <br /> Analytical FAX <br /> 8)776 9600 <br /> (408)782 6308 <br /> www sequoialabs cqAft <br /> Secor-Rancho Cordova Project ARCO#4932,Stockton,CA MMB0227 <br /> 3017 Kilgore Rd Suite 100 Project Number ARCO#4932,Stockton,CA Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 42/25/03 11 03 <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 Lima Notes <br /> Batch 3B13036-EPA 5030B P/T <br /> Blank(3B13036-SLK]) Prepared 02/13/03 Analyzed 02/14/03 <br /> 1,2-Dichloroethane ND 050 ug/1 <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> Surrogate 12-Dichloroethane-d4 509 500 102 78-119 <br /> Laboratory Control Sample(3B13036-BS1) Prepared 02/13/03 Analyzed 02/14/03 <br /> Methyl tent-butyl ether 108 050 14g/l 100 108 63-137 <br /> Surrogate 12-Dichloroethane-d4 497 500 994 78-129 <br /> Laboratory Control Sample(3B13036-BS2) Prepared 02/13/43 Analyzed 02/14/03 <br /> Methyl tert-butyl ether 882 050 149/1 904 976 63-137 <br /> Surrogate 12-Dtchloroethane-d4 514 11500 103 78-129 <br /> Matrix Spike(31313036-MS1) Source MM11012"l Prepared 02/13/03 Analyzed 02/14/03 <br /> Methyl tert-butyl ether 459 25 ug/1 452 ND 982 0-200 <br /> Surrogate 12-Dtchloroethane-d4 498 11500 996 78-129 <br /> Matrtx Spike Du (31113036-MSD]) Source MMB0128-01 Prepared 02/13/03 Analyzed 02/14/03 <br /> Methyl tent-butyl ether 462 25 119/1 452 ND 989 0-200 0 651 200 <br /> Surrogate 12-Dtchloroethane-d4 496 500 992 78-129 <br /> Sequoia Analytical-Morgan Hlll The results in this report apply to the samples analyzed in 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 to its entirety <br /> 20 of 21 <br />