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819 Sinker Avenue,Suite 8 <br /> Sequoia Sacramento,CA 95834 <br /> (916)921-9600 <br /> Analytical FAX(916)921-0100 <br /> J www sequotalabs com <br /> • SECOR International-Rancho Cordova Project Tosco 1205,Lathrop,CA <br /> 3017 Kilgore Road,Suite 100 ProjeatNumber N/A Reported <br /> Rancho Cordova CA,95670 Proi-I Manager Rusty Benkosky 04/10/02 18 08 <br /> Total Purgeable Hydrocarbons, BTEX and MTBE in Air by DHS LUFT-Quality Control <br /> Sequoia Analytical- Sacramento <br /> Reporting Spike Soum %REC RPD <br /> LA.Wyt. Result Lunit Units Level Result %nREC Limits RPD Lunit Notes <br /> Batch 2040016-EPA 5030B <br /> LCS(204001&BS1) Prepared&Analyzed 03/29/02 <br /> Benzene 169 0 050 mghn'Air 200 845 70-130 <br /> Toluene 197 0 050 200 985 70-130 <br /> Ethylbenzene 216 0 050 200 108 70-130 <br /> Xylem(total) 634 0 050 600 106 70-130 <br /> Methyl tert-butyl ether 202 050 200 101 70-130 <br /> Surrogate a a,a-Tryluorotoluene 159 200 790 60-140 <br /> LCS Dup(2040016-_BS_D_1_) Prepared&Analyzed_ 03/29/02 <br /> Benzene 161 0 050 mg/m'Air 200 805 70-130 4 85 25 <br /> Toluene 191 0 050 200 955 70-130 309 25 <br /> Ethylbenzene 213 0 050 200 106 70430 140 25 <br /> Xylenes(total) 635 0 050 600 106 70-130 0 158 25 <br /> Methyl tent-butyl ether 193 0 50 200 965 70-130 4 56 25 <br /> �rogate a,a,a-Trifluorotoluene 134 2 00 670 60-140 <br /> Sequoia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> Page Page 10 of 14 <br />