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1551 Industrial Road <br /> Sequoia San Carlos A94070 <br /> (650)232-96DO <br /> FAX Vw Analytical wwseq(650)232-9612612 <br /> www sequoialabs com <br /> ler-Ryan/GeostrategieS(I) Project Tosco(l) <br /> 47 Sierra Court, Suite J Project Number Tosco(Former BP)SS#11192 Stockton Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 11/21/01 13 29 <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 1110073-EPA 5030B(PIT) <br /> Blank(1110073-BLKI) Prepared&Anaiyzed 11/19/01 <br /> Purgeabie Hydrocarbons as Gasoline ND 50 ug/l <br /> Benzene ND 050 " <br /> Toluene ND 050 " <br /> Eihylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Methyl tert-butyl ether ND 5 0 " <br /> Surrogate a,o a-Tris luororoluene 926 100 926 70-130 <br /> LCS(1110073-BS1) Prepared&Analyzed 11/19/01 <br /> Benzene 844 050 ug/l 100 84 4 70-130 <br /> Toluene 8 14 050 10 0 81 4 70-130 <br /> Ethylbenzene 837 050 100 83 7 70-130 <br /> X lenes(total) 24 9 050 300 830 70-130 <br /> Ware a a o-Tri luorotoluene 891 100 891 70-130 <br /> LCS(I I 10073-BS2) Prepared&Analyzed 11/19/01 <br /> I un-'Lable Hydrocarbons as Gasoline 304 50 ug/l 250 122 70-130 <br /> Surrogate a a a-Tri luorotoluene 892 11100 892 70-130 <br /> Matrix Spike(1110073-MSI) Source LI l I062-06 Prepared&Analyzed 11/19/01 <br /> Purgeable Hydrocarbons as Gasoline 300 50 ug/l 250 ND 120 60-140 <br /> Surrogate a,o o-Trifluorotoluene 977 11100 977 70-130 <br /> _Matrix Spike Dup(I 110073-MSD1) Source L111062-06 Prepared&Analyzed 11/19/01 <br /> Purgeable Hydrocarbons as Gasoline 317 50 ug/l 250 ND 127 60-140 5 51 25 <br /> Surrogate a,a,a-Triuorotoluene 950 100 950 70-130 <br /> to 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 13 of 19 <br />