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819 Striker Avenue,Suite 8 <br /> Sequoia Sacramento,CA 95834 <br /> (916)921 9600 <br /> Analytical FAX(916)921-0100 <br /> www sequotalabs corn <br /> SECOR International-Rancho Cordova Project TOSCO 11192,Stockton,CA • <br /> 3017 Kilgore Road,Suite 100 Project Number N/A Reported <br /> Rancho Cordova CA,95670 Project M-Ver Rusty Benkosky 01/02/02 16 41 <br /> Total Purgeable Hydrocarbon,BTEX and MTBE by DHS LUFT-Quality Control <br /> Sequoia Analytical-Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %R-EC Limits RPD Limit Notes <br /> Batch 1120145-EPA 5030B(P/T) <br /> Blank(1120145-BLKl) Prepared&Analyzed 12/11/01 _ <br /> Purgeable Hydrocarbons ND 50 ug/l <br /> Benzene ND 050 " <br /> Toluene ND 0 50 " <br /> Ethylbenzene ND 0 50 " <br /> Xylenes(total) ND 050 " <br /> Methyl tent-butyl ether ND 25 " <br /> Surrogate a a,a-Triffuorotoluene 109 100 109 60-140 <br /> LCS(1120145-BSI) - Prepared&Analyzed 12/11/01 <br /> Benzene 9 92 050 110 10 0 99 2 70-130 <br /> Toluene 9 58 050 10 0 95 8 70-130 <br /> Ethylbenzene 955 0 50 100 95 5 70-130 <br /> Xylenes(total) 28 8 0 50 300 960 70-130 • <br /> Methyl tert-butyl ether 10 3 2 5 " 10 0 103 70-130 <br /> Surrogate a a,a-Trifluorotoluene 11 5 100 115 60-140 <br /> LCS Dup(I I20145-BSD1) Prepared&Analyzed 12/11/01 <br /> Benzene 948 050 u9/1 10 0 948 70-130 4 54 25 <br /> Toluene 9 06 0 50 100 90 6 70-130 558 25 <br /> Ethylbenzene 9 04 050 100 90 4 70-130 549 25 <br /> Xylenes(total) 274 0 50 300 91 3 70-130 498 25 <br /> Methyl tert-butyl ether 106 2 5 10 0 106 70-130 2 87 25 <br /> Surrogate a a,a-Trrfluorotoluene 103 100 103 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 enttrety <br /> Page Page 8 of 10 <br />