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Gettler-Ryan/Geostrategies(1) Project: Tosco(1) 6747 Siem Court,Suite J Project Number. Unocal SS#11195 Reported: Dublin CA,94568 Project Manager: Deanna Harding 02/26/01 14:46 Total Purgeable Hydrocarbons (C6-C12),BTEX and MTBE by DHS LUFr -Quality Control Sequoia Analytical- San Carlos Reporting Spike Source %REC RPD Analyte Result limit Units Level Result %REC Limits RPD Limit Notes Batch 1020073-EPA 5030B(PI'T) Blank(1020073-BLKI) Prepared&Analyzed:02/23/01 Purgeable Hydrocarbons as Gasoline ND 50.0 ugll Benzene ND 0.500 " Toluene ND 0.500 " Ethylbenzene ND 0.500 " Xylenes(total) ND 0.500 " Methyl tert-butyl ether ND 5.00 " i Surrogate:a,a,a-Trifluorotoluene 10.1 10.0 101 70-130 LCS(1020073-BS2) Prepared&Analyzed:02/23/01 Purgeable Hydrocarbons as Gasoline 262 50.0 ug/1 250 105 70-130 Surrogate:a,a,a-7Wfluorotoluene 11.7 10.0 117 70-130 LCS(1020073-BS3) Prepared&Analyzed:02123101ll' Benzene 12.4 0.500 ugll 10.0 124 70-130 Toluene 12.5 0.500 10.0 125 70-130 Ethylbenzene 12.7 0.500 10.0 127 70-130 Xylenes(total) 37.9 0.500 30.0 126 70-130 Surrogate:a,a,a-Mfluorotoluene 10.3 10.0 103 70-130 Matrix Spike(1020073-MS1) Source:L102061-12 Prepared&Analyzed:02/23/01 Purgeable Hydrocarbons as Gasoline 233 50.0 ug/I 250 ND 93.2 60-140 I Surrogate:a,a,a-2Iry7uorotoluene 11.8 10.0 118 70-130 Matrix Splice Dap(1020073-MSD1) Source:L102061-12 Prepared:02/23/01 Analyzed: 02/24/01 Purgeable Hydrocarbons as Gasoline 220 50.0 ug/l 250 ND 88.0 60-140 5.74 25 Surrogate:a,a,a-Tlrifluorotoluene 11.8 10.0 118 70-130 I E s i E i Sequoia Analytical-San Carlos Me results in this report apply to the samples analyzed in accordance with the chain of custody document.This analytical report must be reproduced in its entirety. E Page 14 of 18