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Striker <br /> Sequoia 819Sac am Sacramento Avenue <br /> 95834 <br /> ID (916)921-9600 <br /> IrAnalytical FAX(916)921-0100 <br /> SECOR Intemattonal Project ARCO 2093,Tracy,CA Sampled 7/27/99 <br /> 9912 Business Park Drive,Ste 100 Project Number N/A Received 7/28/99 <br /> Sacramento,CA 95827 Project Manager Rusty Benkosky Reported 8/10/99 <br /> Total Purgeable Hydrocarbons(C6-C12),BTEX and MTBE in Air by DHS LUFT/Quality Control <br /> Sequoia Analytical-Sacramento <br /> Date Spike Sample QC Reporting Limit Recov RPD RPD <br /> IAnalytc Analyzed Level Result Result Units Recov Limits % Limit % Notes* <br /> Batch. 9070313 Date Prepared 7/29a9- Extraction Method. EEA 5030B(McOli) <br /> Blank - <br /> Purgeable Hydrocarbons 7/29/99 ND mg/ml Air too <br /> Benzene ND 00500 <br /> Toluene ND 00500 <br /> Ethylbenzene ND 00500 <br /> Xylenes(total) ND 00500 <br /> Methyl tert-butyl ether ND 0 500 <br /> Surrogate a,a,a-Trifluorotoluene 200 180 600-140 900 <br /> LC$ 9070313-851 <br /> Benzene 7/29/99 200 1 97 mg/ml Air 700-130 98 5 <br /> Toluene 200 209 700-130 104 <br /> Ethylbenzene 200 208 700-130 104 <br /> S(total) 600 5 91 700-130 985 <br /> tert-butyl ether 200 2 17 700-130 109 <br /> Surrogate a a a-Trifluorotoluene 200 198 600-140 990 <br /> Les DUn 2474313-ESD1 <br /> Benzene 7/29/99 200 200 mg/m'Air 700-130 100 25 0 151 <br /> Toluene 200 2 13 700-130 107 25 0 284 <br /> Ethylbenzene 200 2 12 700-130 106 25 0 1 90 <br /> Xylenes(total) 6 00 602 700-130 100 25 0 151 <br /> Methyl tert-butyl ether 200 223 700-130 112 25 0 2 71 <br /> Surrogate a a a-Triuorotoluene 200 198 " 600-140 990 <br /> Sequoia Analytical-Sacramento *Refer to end of report for text of notes and definitions <br /> Page 4 of 6 <br />