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1551 Indastnat Road <br /> 4DSequoia <br /> San Carlos 94070 <br /> (650)2323 2-9600 <br /> Analytical www <br /> wPAX ww s(650) 32- 612 <br /> coin <br /> 0 er-Ryan/Geostrategies(l) Project Tosco(1) <br /> Sierra Court, Suite J Project Number Tosco(Unocal)SS#6981,Stockton Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 05/07/02 12 56 <br /> Total Purgeable Hydrocarbon (C6-C12) by EPA 8015M and BTEX/MTBE by EPA 8021B -Quality Control <br /> Sequoia Analytical - San Carlos <br /> Reportmg Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2040003- EPA 5030B(P/T)_ <br /> Blank(2040003-BLK1) Prepared&Analyzed 04/01/02 <br /> Purgeable Hydrocarbons as Gasoline ND 50 ug/l <br /> Benzene ND 050 " <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Methyl tert-butyl ether ND 50 " <br /> Surrogate a a a-Tris luorotoluene 918 100 918 70-130 <br /> LCS(2040003-BSI) Prepared&Analyzed 04/01/02 <br /> Benzene 873 050 ug/l 100 873 70-130 <br /> Toluene 879 0 50 100 87 9 70-130 <br /> Ethylbenzene 9 16 050 100 916 70-130 <br /> Xylenes(total) 272 0 50 300 907 70-130 <br /> to a a a-Trifluorotoluene 100 100 100 70-130 <br /> LCS(2040003-BS2) Prepared&Analyzed 04/01/02 <br /> Purgeable Hydrocarbons as Gasoline 237 50 ug/l 250 948 70-130 <br /> Surrogate a a a-Tris luorotaluene 788 100 788 70-130 <br /> Matrix Spike(2040003-MSI) Source L203104-15 Prepared&Analyzed 04/01/02 <br /> Purgeable Hydrocarbons as Gasoline 277 50 ugll 250 ND 111 60-140 <br /> Surrogate a a a-Trifluorotoluene 104 " 100 104 70-130 <br /> Matrix Spike Dup(2040003-MSDI) Source L203104-15 Prepared&Analyzed 04/01/02 <br /> Purgeable Hydrocarbons as Gasoline 282 50 ug/1 250 ND 113 60-140 1 79 25 <br /> Surrogate a a a-Triuorotoluene 103 100 103 70-130 <br /> la Analytical- San Carlos The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 16 of 20 <br />