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819 Striker Avenue, Suite 8 <br /> Sequoia Sacramento CA 95834 <br /> 4,-!D— (916)921-9600 <br /> Analytical FAX(916)921-0100 <br /> to <br /> SECOR international-Sacramento Project ARCO 2093,Tracy, CA Sampled 9/21/99 <br /> 9912 Business Park Dr Ste 100 Project Number N/A Received 9/22/99 <br /> Sacramento,CA 95827 Project Manager Rusty Benkosky Reported 10/5/99 <br /> Total Purgeable Hydrocarbons(C6-C12),BTEX and MTBE in Air by DHS LOFT/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 /> Batch 9090266 Date Prepared 9/24/99 Extraction Method EPA 5030B McOH <br /> Blank 9090266-BLKI <br /> Purgeable Hydrocarbons 9124/99 ND mg/ml Air 100 <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 " 2 00 208 600-140 104 <br /> LCS 9090266-BSI <br /> Benzene 9/24/99 2 00 204 mg/m'Air 700-130 102 <br /> Toluene 2 00 198 700-130 990 <br /> Ethylbenzene 200 2 03 700-130 101 <br /> s(total) <br /> 600 551 700-130 918 <br /> WI tett-butyl ether _ 200 ___ _ 203 700-130 101 <br /> Surrogate a a a-Trifluorotoluene 200 2 25 600-140 113 <br /> LCS pup 9090266-BSD1 <br /> Benzene 9/24/99 200 201. mg/m'Air 700-130 100 25 0 1 98 <br /> Toluene 200 196 700-130 980 250 102 <br /> Ethylbenzene 200 200 700-130 100 250 0 995 <br /> Xylenes(total) 600 543 700-130 905 250 143 <br /> _Methyl tert-_butyl ether_ _ 2 00 200 _ 700-130 _100 _ 250 0 995 <br /> Surrogate a a,a-Trifluorotoluene T 2 00 227 600-140 113 <br /> Sequoia Analytical-Sacramento *Refer to end ofreport for text of notes and definitions <br /> Page 4 of 6 <br />