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Striker Avenue, Suite 8 <br /> Sequoia 8t9Sacramento,CA 95834 <br /> (916)921.9600 <br /> Analytical <br /> FAX (9 16)921-0100 <br /> SECOR International-Sacramento Project: ARCO 4493, Stockton,CA Sampled: 9124199 <br /> 9912 Business Park Dr.,Ste. 100 Project Number: 077.4 1844.012 Received: 9124199 <br /> Sacramento,CA 95827 Project Manager: Rusty Benkosky Reported: 10/8/99 <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 /> Batch: 9090303 Date Prepared: 9128199 Extraction Method: EPA 50308 PIT <br /> Blank 9090303-BLK1 <br /> Purgeable Hydrocarbons 9/28/99 ND ug/l 50.0 <br /> Benzene ND 0.500 <br /> Toluene ND 0.500 <br /> Ethylbenzene ND 0.500 <br /> Xylenes(total) ND 0.500 <br /> Methyl tert-butyl ether _ ND 5.00 <br /> Surrogate: a,a,a-Trifluorotoluene 10.0 9.09 60.0-140 90.9 <br /> LCS 9090303-BSI <br /> Benzene 9/28199 10.0 8.45 ug/l 70.0-130 84.5 <br /> Toluene 10.0 8.50 70.0-130 85.0 <br /> Ethylbenzene 10.0 8.62 70.0-130 86.2 <br /> nes(total) 30.0 25.7 70.0-130 85.7 <br /> JJJVyI tert-butyl ether 10.0 11.1 70.0-130 111 <br /> arrogate: a,a,a-Trifluorotoluene 10.0 9.66 60.0-140 96.6 <br /> Matrix Spike 9090303-MSI 5909340-01 <br /> Benzene 9/28/99 10.0 ND 7.89 ug/1 60.0-140 78.9 <br /> Toluene 10.0 ND 8.12 60.0-140 81.2 <br /> Ethylbenzene 10.0 ND 8.22 60.0-140 82.2 <br /> Xylenes(total) 30.0 ND 24.7 60.0-140 82.3 <br /> Methyi tert-butyl ether L0.0 ND 11.6 _ 60.0-140 I16 <br /> Surrogate: a,a.a-Trifluorotoluene 10.0 8.82 60.0-140 88.2 <br /> Matrix Spike Dup 9090303-MSD1 S909340-01 <br /> Benzene 9/28199 10.0 ND 8.00 ug/l 60.0-140 80.0 25.0 1.38 <br /> Toluene 10.0 ND 8.26 60.0-140 82.6 25.0 1.71 <br /> Ethylbenzene 10.0 ND 8.41 60.0-140 84.1 25.0 2.29 <br /> Xylenes(total) 30.0 ND 25.2 60.0-140 84.0 25.0 2.04 <br />_Methyl tert-butyl ether _ _ 10.0 -- ND _ 12.0 -_ 6_0.0-140120 _25.0 3.39- -� <br /> Surrogate: a,a,a-Trifluorotoluene _ 10.0 8.86 60.0-140 88.6 <br /> Batch: 9090322 _Date Prepared:_9129199 Extraction Method: EPA 5030E(P/T) <br /> Blank 9090322-BLK 1 <br /> Purgeable Hydrocarbons 9129199 ND ug/l 50.0 <br /> Benzene ND 0.500 <br /> Toluene ND 0.500 <br /> Ethylbenzene ND 0.500 <br /> Xylenes(total) ND 0.500 <br /> thyl tert-butyl ether ND 5.00 <br /> uoia Analytical- Sacramento *Refer to end of report for text of notes and definitions. <br /> Page 7 of 14 <br />