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1551 Industnal/toad „ <br /> 4D— —Sequoia San Carlc$CA 94070 <br /> Analytical (650)232-9600 <br /> FAX(650)232-9612 <br /> www sequoialabs com <br /> Gettler-Ryan/Geostrategies(I) Project Tosco(l) <br /> 6747 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 2050018-EPA 5030B(P/l' <br /> Blank(20500I8-BLK1) Prepared&Analyzed 05/09/02 <br /> Purgeable Hydrocarbons as Gasoline ND 50 ug/l <br /> Benzene ND 050 " <br /> Toluene ND 050 " <br /> Ethylbenune ND 050 " <br /> Xylenes(total) ND 050 " <br /> Methyl tort-butyl ether ND 50 <br /> Surrogate a a a-Triuorotoluene 942 100 942 70-130 <br /> LCS(2050018-BSI) Prepared&Analyzed 05/09/02 <br /> Benzene 862 050 ug/l 100 862 70-130 <br /> Toluene 901 050 100 901 70-130 <br /> Ethylbenzene 974 050 100 974 70-130 <br /> Xylenes(total) 295 0 50 300 98 3 70-130 <br /> Surrogate a a a-Trifluorotoluene 931 100 931 70-130 <br /> LCS(2050018-BS2) _- Prepared& Analyzed 05/09/02 - <br /> Purgeable Hydrocarbons as Gasoline 235 50 ugA 250 94 0 70-130 <br /> Surrogate a a a-7rifluorotoluene 9 74 100 974 70-130 <br /> Matrix Spike(2050018-MSI) Source L204132-03 _Prepared&Analyzed 05/09/02 _ <br /> Benzene 104 050 ug/l i 0 0 078 96 2 60-140 <br /> Toluene 8 97 0 50 100 ND 89 7 60-140 <br /> Ethylbenzene 102 050 100 ND 102 60-140 <br /> Xylenes(total) 304 050 300 ND 101 60-140 <br /> Surrogate a aa-Tri luarotoluene 883 " 100 883 70-130 <br /> _Matrix Spike Dup(2050018-MSD1) Source L204132-03 Prepared&Analyzed 05/09/02 <br /> Benzene 104 050 ug/l 100 078 96 2 60-140 000 25 <br /> Toluene 904 050 100 ND 904 60-140 0 777 25 <br /> Ethylbenzene 103 050 10 0 ND 103 60-140 0 976 25 <br /> Xylenes(total) 307 050 300 ND 102 60-140 0 982 25 <br /> Surrogate a a a-7riJluorotoluene 880 100 880 70-130 <br /> Sequoia Analytical -San Carlos The results in this report apply to the samples analyzed in accordance with the chain <br /> custody document This analytical report must be reproduced to its entirety <br /> Page 9 of 14 <br />