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Sequoia 404 ,CA Lane � � Walnut Creel(,CA 94598 (925)988-9600 ;_. Analytical wFAX(925)988-9673 wwsequoialabs.com Gettler Ryan,Inc. -Dublin Project: Tosco 6747 Sierra Court Suite.i Project Number: Tosco# 11195 Reported: Dublin CA,94568 Project Manager: Doug Lee 13-Mar-02 08:19 Total Purgeable Hydrocarbons (C5-C12), BTEX and MTBE by DHS LUFT - Quality Control Sequoia Analytical-Walnut Creek Reporting Spike Source %REC RPD Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes Batch 2CO1003-EPA 5030B McOH Blank(2C01003-BLKI) Prepared&Analyzed: 01-Mar-02 Purgeable Hydrocarbnns(C6-C12) ND 1.0 mg/kg Benzene ND 0.0050 " Toluene ND 0.0050 " Ethylbenzene ND 0.0050 " Xylenes(total) ND 0.0050 " Methyl ter(-butyl ether(MTBE) ND 0.050 " Surrogate a,o,a-TrUheornloluene 0.616 0.600 103 40-140 LCS(2C01003-BSI) Prepared&Analyzed: 01-Mar-02 Benzene 0.704 0.0050 mg/kg 0.800 88 50-150 Toluene 0.822 0.0050 0.800 103 50-150 >::*benzene 0.818 0.0050 0.800 102 50-150 'Xylenes(total) 2,62 0.0050 2.40 109 50-150 Surrogate:a,a,a-Tris luorotohrene 0.648 0.600 108 40-140 Matrix Spike(ZC01003-MSI) Source:W202395-01 Prepared&Analyzed: 01-Mar-02 Benzene 0.468 0.0050 mg/kg 0.800 ND 58 50-150 Toluene 0.704 0.0050 0.800 ND 88 50-150 Ethylbenzene 0.732 0.0050 0.800 ND 92 50-150 Xylenes(total) 2.44 0.0050 2.40 ND 102 50-150 Surrogate:a,a,a-Triuorotohrene 0.490 0.600 82 40-140 Matrix Spike Dup(2C01003-MSD1) Source:W202395-01 Prepared&Analyzed:01-Mar-02 Benzene 0.440 0.0050 mg/kg 0.800 ND 55 50-150 6 20 Toluene 0,7I8 0.0050 0.800 ND 90 50-150 2 20 Ethylbenzene 0.758 0.0050 0.800 ND 95 50-150 3 20 Xylenes(total) 2.27 0.0050 2.40 ND 95 50-150 7 20 Surrogate:a,a,a-TriJluorololuene 0.496 0.600 83 40-140 quoia Analytical - Walnut Creek The 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 entirely. 6 of 8