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i u <br /> 819 Sinker Avenue,Suite 8 <br /> Sequoia Sacramento CA 95834(916)921-9600 - <br /> Analytical FAX(916)921-0100 <br /> www sequolalabs eom <br /> SECOR International-Rancho Cordova Project Tosco 1205,Lathrop,CA <br /> 3017 Kilgore Road, Suite 100 Project Number N/A Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 07/02/02 16 44 <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 2F30002-EPA 5030B PIT <br /> LCS Dup(2F30002-ESDI) Prepared 06/30/02 _Analyzed 07/01/02 <br /> Methyl tert-butyl ether 107 050 ugll 100 107 70-130 577 25 <br /> Benzene 989 0 50 100 989 70-130 0 914 25 <br /> Toluene 9 88 050 100 988 70-130 702 25 <br /> Surrogate 12-Dichloroethane-d4 562 500 112 60-140 <br /> LCS Dup(2]730002-13SD2� Prepared 06/30/02 Analy2ed.07/01102 <br /> Methyl tent-butyl ether 946 0 50 119/1 8 40 113 70-130 0 106 25 <br /> Benzene 5 55 050 5 28 105 70-130 3 86 25 <br /> Toluene 31 4 0 50 31 8 98 7 70-130 0 960 25 <br /> Gasoline Range Organics(C6-C10) 371 50 440 84 3 70-130 0 269 25 <br /> Surrogate 1 2-Dachloroethane-d4 534 500 107 60-140 <br /> Sequoia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document This analytical report must be reproduced in its entirety <br /> Page Page 5 of 6 <br />