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Sequoia <br /> . 1551 Industrial Road <br /> 1J a qu oi a San Carlos 94070 <br /> (650)2323 2-4600 <br /> FAX 0) 2Analytical wwwsegioialabscorn <br /> Icr-Ryan/Geostrategies(1) Project Tosco(1) <br /> Sierra Court,Suite 3 Project Number Tosco(Unocal)SS46981,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 /> Reporting Spice Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Lunn Notes <br /> Batch 2030088-EPA 5030B(PIT) <br /> Blank(2030088-BLK1) Prepared&Analyzed 03/29/02 <br /> Purgeable Hydrocarbons as Gasoline ND 50 ug/l <br /> Benzene ND 0 50 " <br /> Toluene ND 0 50 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Methyl tert-butyl ether ND 5 0 " <br /> Surrogate a,a,a-Trifluorotoluene 105 100 105 70-130 <br /> LCS(2030088-BSI) Prepared&Analyzed 03/29/02 <br /> Benzene 112 050 ugn 100 112 70-130 <br /> Toluene 103 050 100 103 70-130 <br /> Ethylbenzene 970 0 50 100 970 70-130 <br /> Xylenes(total) 28 4 050 300 947 70-130 <br /> ate a a a-Triuorotoluene 106 100 106 70-130 <br /> LCS(2030088-BS2) Prepared&Analyzed 03/29/02 <br /> Purgeable Hydrocarbons as Gasoline 253 50 ug/l 250 101 70-130 <br /> Surrogate a a a-Trivarotoluene 102 100 101 70-130 <br /> Matrix Spike(2030088-MSl) Source L203104-04 Prepared&Analyzed 03/29/02 <br /> Benzene 109 050 ug/l 100 ND 109 60-140 <br /> Toluene 9 80 050 100 ND 980 60-140 <br /> Ethylbenzene 943 050 1100 ND 943 60-140 <br /> Xylenes(total) 277 050 300 ND 923 60-140 <br /> Surrogate a a a-Triuorotoluene 103 100 103 70-130 <br /> Matrix Spike Dup(2030088-MSDI) Source L203104-04 Prepared&Analyzed_03/29/02 <br /> Benzene 118 0 50 119/1 100 ND 118 60-140 793 25 <br /> Toluene 106 0 50 100 ND 106 60-140 7 84 25 <br /> Ethylbenzene 102 0 50 100 ND 102 60-140 7 85 25 <br /> Xylenes(total) 297 0 50 300 ND 990 60-140 6 97 25 <br /> Surrogate a,a a-Trifluorotoluene 105 100 105 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 14 of 20 <br />