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4D9 19 Sinker Ave Ste 8 Sequoia Sacramento,CA 95834 (916)921-9600 qW Analytical FAX(916)921-0100 www sequoialabs com ettler-Ryan-Rancho Cordova Project Former Unocal 0187,Stockton,CA S302535 40 Gold Camp Dr,Ste l70 Project Number NIA Reported Rancho Cordova CA,95670 Project Manager Geoffrey D Risse 03/07/03 17 32 Gasoline (2-Methylpentane to 1,2,4-Trilnethylbenzene) and BTEX by EPA 8015M and 8021B- Quality Contr Sequoia Analytical- Sacramento Reporting Spike Source %ITEC RPD Analyte Result Limit Units Level Result %REC Limits RPD Ltmtt Notes Batch 3020394-EPA 5030B PIT Laboratory Control Sample(3020394-BS4) Prepared&Analyzed 03/04/03 Ethylbenzene 103 050 ugA 100 103 70-130 Xylenes(total) 318 050 300 106 70-130 Methyl tert-butyl ether 113 20 100 113 70-130 Surrogate a a a-Triuorotoluene 105 100 105 60-140 Matrix Spike(3020394-MSI) Source S302516-03 Prepared&Analyzed 02/28/03 Benzene 113 050 ug/1 100 030 110 60-140 Toluene 11 1 050 100 ND 111 60-140 Ethylbenzene 110 050 100 ND 110 60-140 Xylenes(total) 33 5 050 300 ND ]12 60-140 Methyl tert-butyl ether 12 6 20 100 067 119 60-140 Wase a a a-Trlfluorotoluene 113 100 113 60-140 Matrix Spike Dup(3020394-MSD1) Source S302516-03 Prepared&Analyzed 02/28/03 Benzene 113 050 ug/1 100 030 110 60-140 0 25 Toluene 11 1 050 100 ND 111 60-140 0 25 Ethylbenzene 108 0 50 100 ND 108 60-140 2 25 Xylenes(total) 33 1 050 300 ND 110 60-140 1 25 Methyl tert-butyl ether 12 7 2 0 100 067 120 60-140 0 8 25 Surrogate a a a-Trifluorotoluene 11 1 100 111 60-140 o la Analytical -Sacramento The results in this report apply to the samples analyzed in accordance with the chain of custody document Unless otherwise stated results are reported on a wet weight basis This analytical report must be reproduced in its entirety Page 8 of 9