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819 Striker Avenue Suite 8 <br /> ` <br /> Sequoia Sacramento C 95834 <br /> (916)921-9600 1-9600 <br /> FAX(916)921-0100 <br /> Analytical www sequoialabs tom <br /> SECOR International-Rancho Cordova Project ARCO 2133,Stockton,CA <br /> 3017 Kilgore Road, Suite 100 Project Number N/A Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 05/24/01 17 25 <br /> Total Purgeable Hydrocarbons (C6-C12), BTEX and MTBE 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 1050227- EPA 5030B (P/T) <br /> Blank(1050227-BLKI) _ _ _ _ _Pre_pared&Analyzed 05/15/01_ <br /> Purgeable Hydrocarbons ND 500 ug/1 <br /> Benzene ND 0 500 <br /> Toluene ND 0 500 " <br /> Ethvlbenzene ND 0 500 " <br /> Xylenes(total) ND 0 500 " <br /> Methyl tent-butyl ether ND 250 <br /> Surrogate a a a-Triuorotoluene 8 93 100 893 60-140 <br /> LCS(1050227-BSI) Prepared&Analyzed 05/15/01 <br /> Benzene 8 55 0 500 ug/l 100 855 70-130 <br /> Toluene 104 0 500 100 104 70-130 <br /> W-4ne ' <br /> 1 2 0 500 100 112 70-130 <br /> (total) 332 0 500 30 0 111 70-130 <br /> Methyl tert-butyl ether 851 2 50 100 851 70-130 <br /> Surrogate a a a-Tri luorotoluene 947 100 947 60-140 <br /> Matrix Spike(1050227-NISI) Source 5105213-01 Prepared&Analyzed 05/15/01 <br /> Benzene 6 58 0 500 ug/1 100 ND 658 60-140 <br /> Toluene 8 15 0 500 100 ND 815 60-140 <br /> Ethylbenzene 906 0 500 10 0 ND 906 60-140 <br /> Xykaies(total) 270 0 500 300 ND 900 60-140 <br /> Methyl tert-butyl ether 7 44 250 100 ND 744 60-140 <br /> Surrogate a,a a-Triuorotoluene 838 100 858 60-140 <br /> M_atrtx Spike Dup(1050227-MSDI) Source 5105213-01 Prepared&Analyzed 05/15/01 <br /> Benzene 661 0 500 ug/1 100 ND 661 60-140 0 455 25 <br /> Toluene 8 12 0 500 10 0 ND 812 60-140 0 369 25 <br /> Ethylbenzene 899 0 500 100 ND 899 60-140 0 776 25 <br /> Xylenes(total) 268 0 500 300 ND 893 60-140 0 743 25 <br /> Methyl tent-butyl ether 743 250 100 ND 743 60-140 0 135 25 <br /> Surrogate a a a-Triuorotoluene 8 53 100 853 60-140 <br /> oia Analytical -Sacramento The results to 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 7 of 8 <br />