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819 Sinker Avenue Suite 8 <br /> Sequoia Sacramento, 95834 <br /> (9]6))921-9600 <br /> a— —N Analytical FAX(916)921-0100 <br /> qw www sequolalabs corn <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-FPA 5030B PIT <br /> LCS Dup(2F30002-BSD_1) _ Prepared 06/30/02 Analyzed 07/01/02 <br /> Methyl tert-butyl ether 107 050 u9/1 100 107 70-130 5 77 25 <br /> Benzene 9 89 0 50 100 98 9 70-130 0 914 25 <br /> Toluene 9 88 050 100 98 8 70-130 7 02 25 <br /> Surrogate 12-Dichloroethane-d4 5 62 5 00 112 60-140 <br /> LCS Du (2F30002-BSD2) Prepared 06/30/02 Analyzed 07/01/02 <br /> Methyl tert-butyl ether 9 46 0 50 ug/l 840 113 70-130 0 106 25 <br /> Benzene 5 55 0 50 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-C 10) 371 50 440 843 70-130 0 269 25 <br /> Surrogate 12-Dtchloroethane-d4 534 5 00 107 60-140 <br /> 0 <br /> Sequoia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chairs <br /> of custody document This analytical report must be reproduced to its entirety <br /> Page Page 5 of 6 <br />