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819 Sinker Avenue,Suite 8 <br /> Sequoia Sacramento,CA 95834 <br /> Analytical - --(916)921.9600 - <br /> FAX(916)921-0100 <br /> qWwww sequoialabs 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 Pivject 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(21730002-13SD1) Prepared 06/30/02 Analyzed 07/01/02 <br /> Methyl tert-butyl ether 107 0 50 ug/l 100 107 70-130 5 77 25 <br /> Benzene 989 U 50 10 0 98 9 70-130 0 914 25 <br /> Toluene 9 88 0 50 10 0 98 8 70-130 702 25 <br /> Surrogate 1 2-Dichloroethane-d4 5 62 5 00 112 60-140 <br /> LCS_Dup(2F30002-BSD2)_ Prepared 06/30/02 Analyzed 07/01/02__ <br /> Methyl Cert-butyl ether 946 050 ugtl 840 113 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-Dichloroethane-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 /> ofcustody document This analytical report must be reproduced in its entirety. <br /> Page Page 5 of 6 <br />