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1551 Industrial Road <br /> Sequoia San Carlos,CA 94070-4111 <br /> 4 (650)232-9600 <br /> FAX(650)232-9612 <br /> a„) Analytical www.sequoialabs.com <br /> Gettler-Ryan/Geostrategies(1) Project: Tosco(2) Sampled: 515/00 <br /> 6747 Sierra Court,Suite D Project Number. Tosco(Unocal)SS#11195 Received: 515100 <br /> Dublin,CA 94568 Project Manager: Deanna Harding Reported: 5/22100 <br /> 0*11 <br /> _.a_ W <br /> . , <br /> AMMENE NO <br /> Date Spike Sample QC Reporting Limit Recov. RPD RPD <br /> Anal Analyzed Level Result Result Units Recov.Limits % Limit % Notes* <br /> LCS(continued) 0050085-BS1 <br /> Ethylbenzene 5/18/00 10.0 7.52 ug/l 70.0-130 75.2 <br /> Xylenes(total) " 30.0 22.8 " 70.0-130 76.0 <br /> Surrogate: a,a,a-Trifluorotoluene " 10.0 9.91 if70.0-130 99.1 <br /> LCS 0050085-BS2 <br /> Purgeable Hydrocarbons as Gasoline 5/18100 250 245 ug/1 70.0-130 98.0 <br /> Surrogate: a,a,a-Trifluorotoluene it 10.0 9.30 of 70.0-130 93.0 <br /> Matrix Spike 0050085-MSI L005052-07 <br /> Benzene 5/18/00 10.0 ND 10.2 ug/l 60.0-140 102 <br /> Toluene 10.0 ND 9.73 60.0-140 97.3 <br /> Ethylbenzene 10.0 ND 10.0 60.0-140 100 <br /> Xylenes(total) 30.0 ND 30.1 60.0-140 100 <br /> Surrogate: a,a,a-Trifluorotoluene 10.0 9.65 70.0-130 96.5 <br /> Matrix Spike Dnp 0050085-MSD1 L005052-07 - <br /> Benzene 5/18/00 10.0 ND 10.6 ug/l 60.0-140 106 25.0 3.85 <br /> Toluene to 10.0 ND 9.88 60.0-140 98.8 25.0 1.53 <br /> Ethylbenzene 10.0 ND 10.2 60.0-140 102 25.0 1.98 <br /> Xylenes(total) 30.0 ND 30.7 " 60.0-140 102 25.0 1.98 <br /> Surrogate. a,a,a-Trifluorotoluene 10.0 9.77 " 70.0-130 97.7 <br /> Batch: 0050094 Date Prepared: 5/20100 Extraction Method: EPA 5030B 1PM <br /> Blank 0050094-BLKl <br /> Purgeable Hydrocarbons as Gasoline 5120/00 ND ug/l 50.0 <br /> Benzene ItND " 0.500 <br /> Toluene ND " 0.500 <br /> Ethylbenzene ND 0.500 <br /> Xylenes(total) toND 0.500 <br /> Methyl tert-butyl etber 11 ND 5.00 <br /> Surrogate: a,a,a-Difluorotoluene if 10.0 10.0 70.0-130 100 <br /> LCS 0050094-BSI <br /> Benzene 5120/00 10.0 9.86 ug/l 70.0-130 98.6 <br /> Toluene to10.0 9.54 70.0-130 95.4 <br /> Ethylbenzene 10.0 9.98 70.0430 99.8 <br /> Xylenes(total) " 30.0 30.4 It <br /> 70.0-130 101 <br /> Surrogate: a,a,a-Trijluorotoluene to 10.0 10.2 ff 70.0-130 102 <br /> LCS 0050094-BS2 <br /> Purgeable Hydrocarbons as Gasoline 5/20/00 250 234 ugll 70.0-130 93.6 <br /> Sequoia Analytical-San Carlos *Refer to end of report for text of notes and definitions. <br /> Page 9 of 13 <br />