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819 Striker Ave Ste 8 <br /> Sequoia Sacramento,CA 95834 <br /> ' Analytical FAX(916916)921 9600 <br /> 921-0100 <br /> www sequoralabs coni <br /> Geological Technics,Inc Project Montas Bros 5501355 <br /> ' 1101 7th street Project Number 724 2 Reported <br /> Modesto CA,95354 Project Manager Mandeep Singh 01/28/05 11 51 <br /> Volatile Organic Compounds by EPA Method 8260B- Quahty Control <br /> ' Sequoia Analytical-Sacramento <br /> Reporting Spike Source %REC RPI <br /> Analyte Rmult Lirmt Units Level Result %REC Limns RPD Limit Notes <br /> Batch 5010324-EPA 50308 [P/TJ/EPA 8260B <br /> Blank(5010324-BLKI) Prepared 01./21/05 Analyzed 01/22/05 <br /> ' Tert-butyl alcohol ND 50 ug/l <br /> Methyl tert-butyl ether ND 0 50 <br /> Di-isopropyl ether ND 050 " <br /> Ethyl tert-butyl ether ND 050 " <br /> ' Tert-amyl methyl ether ND 050 <br /> 1,2-Dichloroethane ND 0 50 <br /> 1,2-Dibromoethane(EDB) ND 0 50 " <br /> ' Surrogate 12-DCA-d4 984 100 98 60-140 <br /> Blank(5010324-BLK2) Prepared&Analyzed 01/23/05 <br /> Tert-butyl alcohol ND 50 ug/I <br /> Methyl tert-butyl ether ND 0 50 " <br /> Wisopropyl ether ND 050 <br /> thyl tert-butyl ether ND 050 " <br /> Tert-amyl methyl ether ND 0 50 " <br />' 1,2-Dichloroethane ND 0 50 " <br /> 1,2-Dibromoethane(ED$) ND 050 <br /> Surrogate 1 2-DCA-d4 105 " 100 105 60-140 <br />' Laboratory Control Sample(5010324-BSI) Prepared 01/21/05 Analyzed 01/22/05 <br /> Methyl tert-butyl ether 221 050 ug/1 20 0 110 60-140 <br /> Surrogate 1,2-DCA-d4 945 100 94 60-140 <br /> Laboratory Control Sample Du (5010324-BSD1) Prepared&Analyzed 01/23/05 <br /> Methyl tert-butyl ether 215 0 50 ug/1 200 108 60-140 3 25 <br /> Surrogate 12-DCA-d4 996 100 100 60 140 <br />' Matrix Spike(5010324-MSI) Source S501355-18 Prepared 01/25/05 Analyzed 01/26/05 <br /> Methyl tent-butyl ether 318 0 50 ug/I 200 88 115 60-140 <br /> Surrogate 1,2-DCA-d4 983 100 98 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 Unless otherwise stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 17 of 19 <br />