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Sequoia 1551 Industrial Road <br /> San Carlos CA 94070 <br /> (650)232-9600 <br /> Analytical FAX(650)232 9612 <br /> www sequaialabs cots ' <br /> Gcttler-Ryan/Geostrategies(1) Project Tosco(1) <br /> 6747 Sierra Court, Suite J Project Number Tosco(former BP)##11192,Stockton Reported <br /> Dublin CA, 94568 Project Manager Deanna Harding 03/01/02 1119 <br /> Total Purgeable Hydrocarbon (C6-C12) by EPA 8015M and BTEXIMTBE 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 2020063- EPA 5030B (PIT) <br /> Blank(2020063-BLKI) Prepared&Analyzed 02/20/02 <br /> Purgeable Hydrocarbons as Gasoline ND 50 ug/t <br /> Benzene ND 050 " <br /> Toluene ND 0 50 <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Methyl teri-butyl ether ND 5 0 " <br /> Surrogate a a,a-Trii luorotoluene 960 100 960 70-130 <br /> LCS(2020063-BSI) Prepared&Analyzed 02/20/02 <br /> Benzene 8 71 050 ug/l 100 87 1 70-130 <br /> Toluene 867 050 100 867 70-130 <br /> Ethylbenzene 870 050 10 0 870 70-130 <br /> Xylenes(total) 26 3 050 300 877 70-130 <br /> Surrogate a a a-Trt,/luorotoluene 853 100 853 70-130 <br /> LCS(2020063-BS2) Prepared&Analyzed 02/20/02 <br /> Purgeable Hydrocarbons as Gasoline 243 50 ug/l 250 972 70-130 <br /> Surrogate a a a-Triuorotoluene 901 1 " 100 901 70-130 <br /> Matrix Spike(2020063-MSI) Source L202088-05 Prepared&Analyzed 02/20/02 <br /> Purgeable Hydrocarbons as Gasoline 244 50 ug/1 250 ND 976 60-140 <br /> Surrogate a a a-Trtfluorotoluene 9 85 100 985 70-130 <br /> Matrix Spike Du (2020063-MSDI) Source L202088-05 Prepared&Analyzed 02/20/02 <br /> Purgeable Hydrocarbons as Gasoline 260 50 ug/1 250 ND 104 60-140 635 25 <br /> Sui rugate a a a-D ifluorotoluene 969 100 969 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 in its entirety <br /> Page 10 of 14 <br />