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1551 Industrial Road <br /> Sequoia San C]ados CA 94070 <br /> (650)232-9600 <br /> Analytical FAX(650)232-9612 <br /> www sequotalabs com <br /> Ryan/Geostrategies(l) Project Tosco(]) <br /> Sierra Court,Suite J Project Number Tosco#01205(Circle K),Lathrop Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 05/13/02 09 26 <br /> Total Purgeable Hydrocarbon (C6-C12) by EPA 8015M and BTEX/MTBE by EPA 8021B - Quality Control <br /> Sequoia Analytical - San Carlos <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2050019-EPA 5030B (PIT) <br /> Blank(2050019-BLK1) Prepared&Analyzed 05/09/02 <br /> Purgeable Hydrocarbons as Gasoline ND 50 ugf i <br /> Benzene ND 050 " <br />'toluene ND 050 " <br /> Ethylbenzcne ND 050 " <br /> Xylenes(total) ND 050 " <br /> Methyl tert-butyl ether ND so " <br /> Surrogate a,a,a-Trifluorotoluene 999 100 999 70-130 <br /> LCS(2050019-BSI) Prepared&Analyzed 05/09/02 <br /> Benzene 823 050 ug/l 100 823 70-130 - <br /> Toluene 871 050 100 871 70-130 <br /> Ethylbenzene 9 04 050 100 904 70-130 <br /> Xylenes(total) 274 050 300 91 3 70-130 <br />.30'.e a,a a-7}-ifluoratoluene 101 " 100 101 70-130 <br /> LCS(2050019-BS2) Prepared&Analyzed 05/09/02 <br /> Purgeable Hydrocarbons as Gasoline 221 50 ug/1 250 884 70-130 - <br /> Surrogate a a a-T}iuorotoluene 987 100 987 70-130 <br /> Matrix Spike(2050019-MSI) Source L205001-06 Prepared&Analyzed 05109/02 _ <br /> Benzene 890 050 ug/l 100 ND 89 0 60-140 <br /> Toluene 953 0 50 100 ND 953 60-140 <br /> Ethylbenzene 977 050 100 ND 97 7 60-140 <br /> Xylenes(total) 297 050 300 ND 990 60-140 <br /> Surrogate a,a,a-TrYluororoluene 103 100 103 70-130 <br /> Matrix Spike Dup(2050019-MSD]) _ Source-L_2050_01-06 Prepared_&Analyzed 05/09/02 <br /> Benzene 9 13 050 ug/l 100 ND 913 60-140 2 55 25 _ <br /> Toluene 963 050 100 ND 963 60-140 1 04 25 <br /> Ethylbenzene 100 050 " 100 ND 100 60-140 233 25 <br /> Xylenes(total) 301 050 300 ND 100 60-140 134 25 <br /> Surrogate a,a,a-Trifluorotoluene 113 100 113 70-130 <br /> Se Analytical- San Carlos The results in this report apply to the samples analysed in accordance with the chat;of <br /> custody document This analytical report must be reproduced in its entirely <br /> Page 10 of 14 <br />