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Sequoia 1551 Industrial Road <br /> San Carlolos,CA 94070-41 11 <br /> (650) 232-9600 <br /> Analytical <br /> FAX(650) 232-9612 <br /> E67 <br /> ler-Ryan/Geostrategies(l) Project: Tosco(l) Sampled: 5/20/99 <br /> 47 Sierra Court,Suite D ProjectNumber: UnocalSS#1l195 Received: 5/20/99 <br /> blin,CA 94568 Project Manager: Deanna Harding Reported: 6/3/99 <br /> Total Purgeable Hydrocarbons(C6-C12),BTEX"and MTBE by DHS LUFTIQuality Control <br /> Sequoia Analytical San.Carlos <br /> Date Spike Sample QC Reporting Limit Recov. RPD RPD <br /> Analyte Analyzed Level Result Result Units Recov.Limits % Limit % Notes* <br /> Matrix Spike Dup(continued) 9050117-MSD/ L90546_2-12 <br /> Surrogate: a,a,a-Trijluorotoluene 5/26/99 10.0 7.60 ug/1 70.0-130 76.0 <br /> Batch: 9050125 Date Prepared: 5/27/99 Extraction Method: EPA 5030B IP/Tl <br /> Blank 9050125-BLK1 <br /> Purgeable Hydrocarbons as Gasoline 5/27/99 ND ug/1 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 10.1 70.0-130 101 <br /> LCS 9050125-BSI <br /> Benzene 5/27/99 10.0 8.21 ug/1 70.0-130 82.1 <br /> Toluene 10.0 8.05 70.0-130 80.5 <br /> 3y1benzene 10.0 8.25 70.0-130 82.5 <br /> =i ylenes(total) 30.0 24.5 70.0-130 81.7 <br /> Surrogate: a,a,a-Trifluorotoluene 10.0 9.55 70.0-130 95.5 <br /> Matrix Spike 9050125-MSI L905265-01 <br /> Benzene 5127/99 10.0 ND 8.93 ug/l 60.0-140 89.3 <br /> Toluene " 10.0 ND 8.71 1. 60.0-140 87.1 <br /> Ethylbenzene It <br /> 10.0 ND 8,83 It <br /> 60.0-140 88.3 <br /> Xylenes(total) 30.0 ND 26.7 60.0-140 89.0 <br /> Surrogate: a,a,a-Trifluorotoluene 10.0 8.56 70.0-130 85.6 <br /> Matrix Spike Dup 9050125-MSD/ L905265-01 <br /> Benzene 5127/99 10.0 ND 8.76 ug/l 60.0-140 87.6 25.0 1.92 <br /> Toluene " 10.0 ND 8.99 " 60.0-140 89.9 25.0 3.16 <br /> Ethylbenzene 10.0 ND 9.06 60.0-140 90.6 25.0 2.57 <br /> Xylenes(total) 30.0 ND 26.9 60.0-140 89.7 25.0 0.783 <br /> Surrogate: a,a,a-Triuorotoluene 10.0 8.02 70.0-130 80.2 <br /> Batch: 9050126 Date Prepared: 5/27/99 Extraction Method: EPA 5030B [P/TI <br /> Blank 9050126-BLK1 <br /> Purgeable Hydrocarbons as Gasoline 5/27/99 ND ug/1 50.0 <br /> Benzene It ND 0.500 <br /> Toluene It ND 0.500 <br /> Ethylbenzene ND 0.500 <br /> Xylenes(total) ND " 0.500 <br /> Methyl tent-butyl ether ND 5.00 <br /> JXuoia Analytical-San Carlos *Refer to end of report for text of notes and definitions. <br /> Page 14 of 19 e <br />