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Sequoia \� 819 Striker Avenue,Suite 8 <br /> Sacramento,CA 95834 <br /> Analytical (916)921-9600 <br /> FAX(916)92 1-0 100 <br /> SECOR International Project: ARCO 434,Lodi,CA Sampled: 7/8/99 <br /> 9912 Business Park Drive,Ste. 100 Project Number: N/A Received: 7/8/99 <br /> Sacramento,CA 95827 Project Manager: Rusty Benkosky Reported: 7/13, 14/99 <br /> Total Purgeable Hydrocarbons(C6-Cl2)and BTEX by DHS LUFT/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 /> Batch: 9070117 Date Prepared: 7/8/99 ]extraction Method; FPA 5030B(McQH) <br /> Bek 9070117-BLKI <br /> Purgeable Hydrocarbons 7/8/99 ND mg/kg 1.00 <br /> Benzene ND 0.00500 <br /> Toluene ND 0.00500 <br /> Ethylbenzene ND 0.00500 <br /> Xylenes(total) ND 0.00500 <br /> Surrogate: a,a.a-Tris luorotoluene 0.100 0202. 60.0-140 /01 <br /> I,CS 9070117-BSI <br /> Benzene 7/8/99 0.200 0.209 mg/kg 70.0-130 105 <br /> Toluene 0.200 0.226 70.0-130 113 <br /> Ethylbenzene 0.200 0.229 70.0-130 114 <br /> Xylenes(total) 0.600 0.607 70.0-130 101 <br /> Surrogate. a,a,a-Tris luorotoluene 0.200 0.201 60.0-140 101 <br /> Matrix Spike 9070117-MS1 S907052-22 <br /> Benzene 7/8/99 0.200 ND 0.178 mg/kg 60.0-140 89.0 <br /> Toluene 0.200 ND 0.193 60.0-140 96.5 <br /> Ethylbenzene 0.200 ND 0.198 60.0-140 99.0 <br /> Xylenes(total) 0.600 ND 0.547 60.0-140 91.2 <br /> Surrogate: a,a,a-Triiluorotoluene 0.100 0.200 60.0-140 100 <br /> Matrix Spike Duo 9070117-MSD1 5907052-22 <br /> Benzene 7/8/99 0.200 NO 0.179 mg/kg 60.0-140 89.5 25.0 0.560 <br /> Toluene 0.200 ND 0.197 60.0440 98.5 25.0 2.05 <br /> Ethylbenzene 0.200 ND 0.198 60.0-140 99.0 25.0 0 <br /> Xylenes(total) 0.600 ND 0.545 60.0-140 90.8 25.0 0.440 <br /> Surrogate: a,a.a-TriJluorotoluene 0.200 0.101 60.0-140 101 <br /> Sequoia Analytical-Sacramento `Refer to end of report for text of notes and definitions. <br /> Page 5 of 8 <br />