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1551 Industrial Road <br /> Sequoia San Carlos CA 94070-411 L <br /> (650) 232-9600 <br /> 4 FAX(650) Z32-9612 <br /> Analytical www sequoialabs corn <br /> 7ettler-Rya 7Geostrategles(l) Project Tosco(8) Sampled 10/25/00 <br /> 6747 Sierra Court,Suite J Project Number TOSCO#6981 - Received 10/26/00 <br /> Dublin,CA 94568 Project Manager Scott Polston Reported 10/31/00 <br /> " Total Purgeable Hydrocarbons(C&C12);BTEX and MTBE by DHS Li]F'T/Quality Control <br /> R m <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 /> Batch 0100133 Date Prepared 10/26/00 Extraction Method EPA 5030B LP/Tl <br /> Blank 0100133-BLK1 <br /> Purgeable Hydrocarbons as Gasoline 10/26/00 ND ug/l Soo <br /> Benzene ND 0 500 <br /> Toluene ND 0 500 <br /> Ethylbenzene ND 0 500 <br /> Xylenes(total) ND 0 500 <br /> Methyl tent-butyl ether ND 500 <br /> Surrogate a a a-Trifluorotoluene 100 818 700-130 818 <br /> LCS 0100133-BSI <br /> Benzene 10/26/00 100 9 39 ug/l 700-130 93 9 <br /> Toluene 100 8 85 700-130 88 5 <br /> Ethylbenzene 100 875 700-130 875 <br /> Xylenes(total) 300 267 700-130 890 • <br /> Surrogate a a a-Tnfluorotoluene 100 103 700-130 103 <br /> LCS 0100133-BS2 <br /> Purgeable Hydrocarbons as Gasoline 10/26/00 250 258 ug/1 700-130 103 <br /> Surrogate a,a,a-Trifluorotoluene /00 807 700-130 80 7 <br /> Matrix Spike 0100133-MS1 L010203-04 <br /> Purgeable Hydrocarbons as Gasoline 10/27/00 250 ND 240 ug/l 60 0-t40 960 <br /> Surrogate a a,a-Trifluorotoluene to100 774 rr70 0-130 774 <br /> Matrix Spike Duo 0100133-MSD1 L010203-04 <br /> Purgeable Hydrocarbons as Gasoline 10/27/00 250 ND 259 ug/1 600-140 104 25 0 800 <br /> Surrogate a a,a-Trifluorotoluene 10 0 9 05 700-130 90 S <br /> • <br /> Sequoia Analytical-San Carlos *Refer to end of report for text of notes and definitions <br /> Page 3 of 4 <br />