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'� It <br /> 885 Jarvis DrIm <br /> � Sequoia Morgan Hill,CACA95037037 <br /> (408)766-9600 <br /> qW Analytical FAX(408)7a6labs,c rn <br /> www sequomlabs coni <br /> 9 <br /> Secor-Rancho Cordova Project ARCO#4932,Stockton, CA MMG0728 <br /> 3017 Kilgore Rd Suite 100 Project Number Arco#4932,Stockton,CA Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 08/05/03 14 58 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical-Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Lama Units Level Result %REC Lunits RPD Lmut Notes <br /> Batch 3G31008-EPA 5030B PIT <br /> Laboratory Control Sample(3G31008-BSI) Prepared&Analyzed 07/31/03 <br /> Methyl tert-butyl ether 9 14 050 ug/l 100 914 63-137 <br /> Benzene 773 050 100 773 78-124 Q LIM <br /> Toluene 896 050 100 896 78-129 <br /> Surrogate 1 2-Dtchloroethane-d4 551 500 110 78-129 <br /> Laboratory Control Sample(3G31008-BS2) Prepared&Analyzed 07/31/03 <br /> Gasoline Range Organics(C6-C10) 459 50 ug/l 440 104 70-113 <br /> Surrogate 12-Dtchloroethane-d4 565 500 113 78-129 <br /> Matrix Spike(3G31008-MS1) Source MMG0726-04 Prepared&Analyzed 07/31/03 <br /> Methyl tert-butyl ether 1860 50 ug/l 992 1000 867 63-137 <br /> Benzene 554 50 640 ND 866 78-124 <br /> Toluene 3060 50 2970 ND 103 78-129 . <br /> Gasoline Range Organics(C6-C 10) 45500 5000 44000 1100 101 70-113 <br /> Surrogate 12-Dtchloroethane-d4 531 500 106 78-129 <br /> Matrix Spike Dup(3G31008-MSD1) Source MMG0726-04 Prepared&Analyzed 07/31/03 <br /> Methyl tert-butyl ether 1850 50 ug/l 992 1000 857 63-137 0 539 13 <br /> Benzene 528 50 640 ND 825 78-124 481 12 <br /> Toluene 2960 50 2970 ND 99 7 78-129 332 10 <br /> Gasoline Range Organics(C6-C10) 45300 5000 44000 1100 100 70-113 0 441 9 <br /> Surrogate 12-Dtchloroethane-d4 519 500 104 78-129 <br /> Batch 3HO1002-EPA 5030B PIT <br /> Blank(3H01002-BLKI) Prepared&Analyzed 08/01/03 <br /> Ethanol ND 100 ug/l <br /> tert-Butyl alcohol ND 20 " <br /> Methyl cert-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-Dtchloroethane ND 050 <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> Benzene ND 050 <br /> Toluene <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Sequoia Analytical-Morgan Hill 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 in its entirety <br /> 14 of 18 <br />