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Sequoia 1551 Industrial Road <br /> San Carlos,CA 94070-4111 <br /> An ay1 yti c a y (650) 232-9600 <br /> f.il FAX(650) 232-9612 <br /> ;ttler-Ryan/Geostrategies(l) Project: Tosco(l) Sampled: 5/20199 <br /> 6747 Sierra Court,Suite D Project Number: Unocal SS#11195 Received: 5/20/99 <br /> Dublin,CA 94568 Project Manager: Deanna Harding Reported: 6/3/99 <br /> Total Purgeable Hydrocarbons(C6-Ci2);BTEX and MTBE':by DHS LUST/Quality Control <br /> Sequoia Analytical S San Carlos <br /> Date Spike Sample QC Reporting Limit Recov. RPD RPD <br /> Analyte Analyzed Level Result Result Units Recov. Limits % Limit % Notes* <br /> Blank(continued) 9050126-BLK1 <br /> Surrogate: a,a,a-Trifluorotoluene 5127199 10.0 9.45 u9/1 70.0-130 94.5 <br /> LCS 9050126-BSI <br /> Benzene 5/27/99 10.0 8.14 ug/I 70.0-130 81.4 <br /> Toluene " 10.0 8.16 70,0-130 81.6 <br /> Etbylbenzene 10.0 8.18 70.0-130 81.8 <br /> Xylenes(total) _ 30.0 24.6 70.0-130 82.0 _ <br /> Surrogate: a,a,a-Trifluorotoluene "u 10.0 8.35 70.0-130 83.5 <br /> Matrix Spike 9050126-MS1 L905298-11 <br /> Benzene 5/27/99 10.0 ND 8.54 ug/l 60.0-140 85.4 <br /> Toluene 10.0 ND 8.56 60.0-140 85.6 <br /> Ethylbenzene 10.0 ND 8.60 60.0-140 86.0 <br /> _Xylenes(total) 30.0 ND 25.6 _ 60.0-140 85.3 <br /> Surrogate: a.a,a-Trifluorotoluene 10.0 7.68 70.0-130 76.8 <br /> ~Y4atrix Spike Dup 9050126-MSD/ L905298-11 <br /> Benzene 5/27/99 10.0 ND 8.33 ug/1 60.0-140 83.3 25.0 2.49 <br /> Toluene " 10.0 ND 8.37 IF <br /> 60.0-140 83.7 25.0 2.24 <br /> Ethylbenzene 10.0 ND 8.37 60.0-140 83.7 25.0 2.71 <br /> Xylenes(total) 30.0 ND 16.8 60.0-140 56.0 25.0 41.5 2 <br /> Surrogate: a,a,a-Trifluorotoluene 10.0 8.04 70.0-130 80.4 <br /> �uoia Analytical-San Carlos *Refer to end of report for text of notes and definitions. <br /> Page 15 of 19 <br />