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819 Stryker Avenue,Suite 8 <br /> — -Sequoia Sacramento,CA 95834 - <br /> (916)921-9600 <br /> Analytical FAX(916)92I-0100 <br /> www sequoialabs co <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 04/10/02 18 00 <br /> Total Purgeable Hydrocarbon,BTEX and MTBE by DHS LUFT-Quality Control <br /> Sequoia Analytical- Sacramento <br /> Reporting Spike Source %REC RPD <br /> LA,Wyu Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2040103-EPA 5030B(PIT) <br /> LCS(2040103-BSI) _ Prepared&Analyzed 04/05/02 _ <br /> Benzene 821 0 50 ug/l 100 62 1 70-130 <br /> Toluene 8 61 050 100 86 1 70-130 <br /> Ethylbenzene 9 82 050 to 0 98 2 70-130 <br /> Xylenes(total) 290 0 50 300 967 70-130 <br /> Methyl tert-butyl ether 950 2 5 10 0 950 70-130 <br /> Surrogate a a a-Trrfluorotoluene 109 " 100 109 60-140 <br /> _Matrix Spike(2040103-MSI) Source-S204020-04 Prepared&Analyzed 04/05/02 <br /> Benzene 8 98 050 ug/1 too ND 898 60-140 <br /> Toluene 9 19 050 10 0 ND 91 9 60-140 <br /> Ethylbenzene 108 050 100 ND 108 60-140 <br /> Xylenes(total) 31 5 050 300 ND 105 60-140 <br /> Methyl tert-butyl ether 110 2 5 too ND 110 60-140 <br /> Surrogate a a a-Tri luorotoluene 11 6 10 0 116 60-140 <br /> Matrix Spike Du 2040103-MSD1 Source 5204020-04 Prepared&Analyzed 04/05/02 <br /> Benzene 8 60 0 50 ug/1 100 ND 860 60-140 432 25 <br /> Toluene 8 78 050 too ND 878 60-140 456 25 <br /> Ethyibenzone 103 050 10 0 ND 103 60-140 4 74 25 <br /> Xylenes(total) 302 050 300 ND 101 60-I40 421 25 <br /> Methyl tert-butyl ether 10 8 2 5 10 0 ND 108 60-140 1 83 25 <br /> Surrogate a a a-Trifluorotoluene 115 100 115 60-140 <br /> Sequoia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the cha� <br /> of custody document This analytical report must be reproduced in its entire <br /> Page Page 10 of 14 <br />