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Sequoia Sig Striker Avenue S S <br /> 4 Sacramento CA 95858 34 <br /> (916)921-9100 <br /> Analytical <br /> FAX(916) 921-0 100 <br /> SECOR International Project ARCO 2093,Tracy,CA Sampled 8/18/99 <br /> 9912 Business Park Dr,Ste 100 Protect Number 077-41728 001 Received 8/19/99 <br /> Sacramento,CA 95827 Project Manager Rusty Benkosky Reported 8/30/99 <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 /> Analyte Analyzed Level Result Result Units Recov Limits % Limit % Notes* <br /> Batch 9080167 Date Prepared 8/20199 Extraction Method EPA 5030E(MeOH) <br /> Blank 9080167-BLK I <br /> Purgeable Hydrocarbons 8/20/99 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 200 185 600-140 925 <br /> LCS 9080167-BS1 <br /> Benzene 8/20/99 200 205 mg/ml Air 700-130 102 <br /> Toluene 200 216 700-130 108 <br /> Ethylbenzene 200 216 700-130 108 <br /> s{total} " 600 582 700-130 970 � -- — <br /> tert-butyl ether _ _ 200 225 700-130 113 <br /> Surrogate a a a-Tr fluorotoluene 200 224 600-140 112 <br /> LCS Dup 9080167-BSD1 <br /> Benzene 8120/99 200 2 00 mg/ml Air 700-130 100 250 198 <br /> Toluene 200 2 11 700-130 105 250 282 <br /> Ethylbenzene 200 2 10 700-130 105 250 282 <br /> Xylenes(total) 600 562 700-130 93 7 25 0 346 <br /> Methyl tert-butyl ether _" 200 227 _ 700-130 113 _ 250 _ 0 <br /> Surrogate a,a,a-Trifluorotoluene 200 215 600-140 108 <br /> Sequoia Analytical-Sacramento *Refer to end of report for text of notes and definitions <br /> Page 4 of 6 <br />