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819 Sinker Avenue,Smte g <br /> Sequoia Sacramento,CA - <br /> 95834 <br /> (916)921-9600 <br /> Analy�*eal FAX(916)421-0100 <br /> www sequo-slabs com <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 M-9- Rusty Benkosky 04/12/02 16 39 <br /> Total Purgeable Hydrocarbons,BTEX and MTBE in Air by DHS LUFT-Quality Control <br /> Sequoia Analytical- Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2040085-EPA 5030B(PfD <br /> Blank(2040085-BLK1) _ Prepared&Analyzed 04/03/02 <br /> Purgeable Hydrocarbons ND 10 mg/m'Air _ <br /> Benzene ND 0 050 " <br /> Toluene ND 0 050 " <br /> Ethylbenzene ND 0 050 " <br /> Xylenes(total) ND 0 050 " <br /> Methyl tent-butyl ether ND 050 " <br /> Surrogate a,a a-Trifluorotoluene 1 09 2 00 104 60-140 <br /> LCS(2040085-BSI) Prepared&Anal zed 04/03/02 <br /> Benzene 1 62 0 050 mg/ml Air 200 810 70-130 <br /> Toluene 1 85 0 050 200 92 5 70-130 <br /> Ethylbenzene 2 04 0 050 " 200 102 70-130 <br /> Xylenes(total) 5 98 0 050 600 997 70-130 <br /> Methyl tert-butyl ether 2 01 050 200 100 70-130 <br /> Surrogate a a a-Trifluorotoluene 2 15 2 00 108 60-140 <br /> LCS Du 2040085-BSDI Prepared&Analyzed 04/03/02 <br /> Benzene 1 68 0 050 mg/ml Air 200 840 70-130 3 64 25 <br /> Toluene 1 86 0 050 200 93 0 70-130 0 539 25 <br /> Ethylbenzene 2 08 0 050 200 104 70-130 1 94 25 <br /> Xylenes(total) 604 0 050 600 10I 70-130 0 998 25 <br /> Methyl tert-butyl ether 2 39 050 200 120 70-130 173 25 <br /> Surrogate a a a-Tr fluorotoluene 2 14 200 107 60-140 <br /> Sequoia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chat <br /> of custody document This analytical report must be reproduced to its enure <br /> Page Page 9 of 14 <br />