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i1 819 Striker Avenue Suite 8 <br /> Sequoia Sacramento91CA 958M <br /> (916)921-960096W <br /> FAX(916)921-0100 <br /> Analytical www sequolalabscom <br /> SECOR International-Rancho Cordova Project ARCO 595, Stockton,CA <br /> 3017 Kilgore Road, Suite 100 Project Number N/A Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 08/20/01 18 00 <br /> Total Purgeable Hydrocarbon, 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 1080189- EPA 5030B(PIT) <br /> Blank(1080189-BLKI) Prepared&Analyzed 08/15/01 <br /> Purgeable Hydrocarbons ND 50 ug/l <br /> Benzene ND 0 50 " <br /> Toluene ND 0 50 " <br /> Ethylbenzene ND 0 50 " <br /> Xylenes(total) ND 0 50 " <br /> Methyl tert-butyl ether ND 25 " <br /> Surrogate a a a-71rifluorotoluene 118 too 118 60-140 <br /> LCS(1080189-BSI)_ _ _ _ Prepared&Analyzed 08/15/01 <br /> BenzeneT 954 0 50 ug/1 100 954 70-130 <br /> Toluene 954 0 50 100 95 4 70-130 <br /> a <br /> benzene 950 0 50 100 950 70-130 <br /> es(total) 268 050 300 893 70-130 <br /> Methyl ten-butyl ether 13 0 25 t0 0 130 70-130 <br /> Surrogate a a a-Tr f7uorotoluene 120 too 120 60-140 <br /> Matrix Spike(1080189-MSI) Source S108070-06 Prepared&Analyzed 08/15/01 <br /> Benzene 9 93 0 50 ugA 100 ND 993 60-140 <br /> Toluene too 0 50 100 ND 100 60-140 <br /> Ethylbenzene 100 050 100 ND 100 60-140 <br /> Xylenes(total) 285 050 300 ND 950 60-140 <br /> Methyl tort-butyl ether 112 25 too ND 112 60-140 <br /> Surrogate a,a a-Triuorololuene 119 too 119 60-140 <br /> Matrix Spike Dup(1080189-MSD1) Source S108070-06 Prepared&Analyzed 08/15/01 <br /> Benzene 993 050 ugA 100 ND 99 3 60-140 000 25 <br /> Toluene 999 050 too ND 999 60-140 0 100 25 <br /> Ethylbenzene 9 95 050 100 ND 995 60-140 0 501 25 <br /> Xylenes(total) 281 050 300 ND 93 7 60-140 141 25 <br /> Methyl tent-butyl ether 11 1 2 5 too ND 111 60-140 0 897 25 <br /> Surrogate a,a,a-Trruorotoluene 11 7 100 117 60-140 <br /> nota 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 10 of 13 <br />