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*, 0 <br /> Sequoia 819 Sacramento Avenue CA 95834 <br /> (916)921-9600 <br /> Analytical FAX(916)921 0100 <br /> SECOR International-Sacramento Project ARCO 2093,Tracy,CA Sampled 2/29/00 <br /> 9912 Business Park Dr,Ste 100 Project Number N/A Received 3/1100 <br /> Sacramento,CA 95827 Pro ect Manager Rusty Benkosky Reported 3/10/00 <br /> Total Purgeable Hydrocarbons(C6-C12), BTEX and MTBE by DHS LUFT/Quality Control <br /> Sequoia Analytical-Sacramento <br /> Date Spike Sample QC Reporting Limit Recov RPD RPD <br />[Analyte Analyzed Level Result Result Units Recov Limits % Limit % Notes* <br /> Matrix Spike(continued) 0030088-MSI 5003031-06 <br /> Xylenes(total) 3/8/00 300 ND 31 6 ug/l 600-140 105 <br /> Methyl tert-butyl ether _ _ _ 10 0 4 76 15 1 _ 600-140 103 <br /> Surrogate a a a-Tri luorotoluene 10 0 106 600-140 106 <br /> Matrix Spike Dup 0030088-MSD1 5003031-06 <br /> Benzene 3/8/00 100 ND 103 ug/l 600-140 103 250 0 966 <br /> Toluene " 100 ND 102 60 0-140 102 250 0 976 <br /> Ethylbenzene too ND 103 600-140 103 25 0 192 <br /> Xylenes(total) 300 ND 31 0 600-140 103 25 0 192 <br /> Mcthyl tert-butyl ether _ __ _ _ _ 10 0 _ _ 476 160 _ 60_0-140 112 25 0_ 837 <br /> Surrogate a a a-Trifluorotoluen_ e MOO 10 5 60 0-140 105 <br /> • <br /> Sequoia Analytical-Sacramento *Refer to end of report for text of notes and definitions <br /> Page 8 of 9 <br />