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N u <br /> tD <br /> 885l,CA 037 <br /> nw <br /> Sequoia Morgan Hill, <br /> 7766-9600 <br /> 1W Analytical FAX{408}782-6306 <br /> www sequoialabacom <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 Lutut Units Level Result %REC Lanes RPD Luna Notes <br /> Batch 3G31001 -EPA 5030B PIT <br /> Blank(3G31001-BLKI) Prepared&Analyzed 07/31/03 <br /> Ethanol ND 100 ug/1 <br /> Cert-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 /> Benzene ND 050 " <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 <br /> Gasoline Range Organics(C6-C 10) ND 50 " <br /> Surrogate 1 2-Dichloroethane-d4 529 500 106 78-129 <br /> Laboratory Control Sample(3G31001-BSI) Prepared&Analyzed 07/31/03 <br /> Methyl tert-butyl ether 847 050 ug/l 100 847 63-137 <br /> Benzene 849 050 100 849 78-124 <br /> Toluene 10 6 050 100 106 78-129 <br /> Surrogate 1 1-Dichloroelhane-d4 538 500 108 78-129 <br /> Laboratory Control Sample(3G31001-BS2) Prepared&Analyzed 07/31/03 <br /> Methyl tert-butyl ether 912 050 ug/l 992 91 9 63-137 <br /> Benzene 576 050 640 90 0 78-124 <br /> Toluene 35 1 050 297 118 78-129 <br /> Gasoline Range Organics(C6-C10) 434 50 440 986 70 113 <br /> Surrogate 1 2-Dichloroethane-d4 537 300 107 78-129 <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 entirely <br /> 12 of 18 <br />