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819 Striker Avenue Suite 8 <br /> 1 Sequoia Sacramento C2 95834 <br /> Sequoia (916)921-9600 <br /> 921 <br /> Analytical FAX equ alabsc m <br /> www sequolalabs com <br /> 4w <br /> SECOR International- Rancho Cordova Project ARCO 2133,Stockton,CA Sampled 9/13/00 to 9114/00 <br /> 3017 Kilgore Road,Suite 100 Project Number N/A Received 9114/00 <br /> Rancho Cordova,CA 95670 Project Manager Rusty Benkosky Reported 9128/00 <br /> Total Purgeable Hydrocarbons(C6-C12), BTEX and MTBE by DHS LUIrT/Quality Control <br /> Sequoia Analytical-Sacramento <br /> Date Spike Sample QC Reporting Limit Recov RPD RPD <br /> iAnalyte Analyzed Level Result Result Units Recov Limits % Limit % Notes* <br /> LCS(continued} 0090248-SSI <br /> _Methyl tent-butyl ether _ _ 9/26100 100 991 ug/l 700-130 99 <br /> Surrogate a a a-Trifluorotoluene 1110 0 103 600-140 103 <br /> Matrix Spike 0090248-MS1 S009211-19 <br /> Benzene 9126/00 too ND 8 81 ug/l 600-140 881 <br /> Toluene too ND 959 600-140 95 9 <br /> Ethylbenzene 100 ND 9 19 600-140 919 <br /> Xylenes(total) 300 ND 270 600-140 900 <br /> _Methyl tert-butyl ether 100 _ ND 8 87 600-140 88 7 <br /> Surrogate a a a-Trrfluorotoluene 100 100 600-140 100 <br /> Matrix Spike Dup 0090248-MSD1 S009211-19 <br /> �fte9/26/00 t Q 0 ND 8 86 ug/l 600-140 886 250 0 566 <br /> lawne 1. 100 ND 856 60 0-140 856 250 113 <br /> Ethylbenzene 100 ND 929 600-140 929 250 108 <br /> Xylenes(total) 300 ND 270 600-140 900 250 0 <br /> Methyl tert-butyl ether _ 10 0 ND 9 17 600-140 917 25 0 333 <br /> Surrogate a,a a-Trifluorotoluene 100 988 600-140 98 8 <br /> Sequoia Analytical-Sacramento "Refer to end of report for text of notes and definitions <br /> Page 9 of 10 <br />