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1551 Industrial Road <br /> Sequoia a San Carlos CA 94070 <br /> (650)232-9600 <br /> Analytical FAX(650)232-9612 <br /> www sequotalabscom <br /> ler-Ryan/Geostrategies(I Project Tosco(1) <br /> Sierra Court, Suite J Project Number Tosco#4409,Stockton Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 05/03/02 10 10 <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 2040092-EPA 5030B(PIT) <br /> Blank(2040092-BLKI) Prepared&Analyzed 04/30/02 <br /> Purgeable Hydrocarbons as Gasoline ND 50 ug/1 <br /> Benzene ND 050 " <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Methyl tent-butyl ether ND 50 " <br /> Surrogate a a a-TriJluorotoluene 110 100 110 70-130 <br /> LCS(2040092-BSI) Prepared&Analyzed 04/30/02 <br /> Benzene 930 0 50 ug/l 10 0 93 0 70-130 <br /> Toluene 943 050 10 0 94 3 70-130 <br /> Ethylbenzene 9 97 050 " 100 997 70-130 <br /> Xylenes(total) 29 9 050 300 99 7 70-130 <br /> afe a a a-Triuorotoluene 9 79 100 979 70-130 <br /> LES(2040092-13S2) Prepared&Analyzed 04/30/02 <br /> Purgeable Hydrocarbons as Gasoline 269 50 ug/I 250 108 70-130 <br /> Surrogate a a a-Trifluorotoluene 113 11100 113 70-130 <br /> Matrix Spike(2040092-MSI) - Source L204089-06 Prepared 04/30/02 Analyzed 05/01/02 <br /> Purgeable Hydrocarbons as Gasoline 271 50 ug/l 250 ND 108 60-140 <br /> Surrogate a a a-Trifluorotoluene 104 10 0 104 70-130 <br /> Matrix Spike Dup(2040092-MSDI) Source L204089-06 Prepared 04/30/02 Analyzed 05/01/02 <br /> Purgeable Hydrocarbons as Gasoline 273 50 ug/1 250 ND 109 60-140 0 735 25 <br /> Surrogate a a a-Trtfluorofoluene 9 98 11100 99 8 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 11 of 16 <br />