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Sequoia Walnut <br /> N. CLane <br /> t Creels,,CAA 94598 <br /> (925)988-9600 <br /> .:._ Analytical www.5equoialabs.com(925)988-9673 <br /> wwequoialabs.coaUs.com <br /> Crettler Ryan,Inc.-Dublin Project: Tosco <br /> 6747 Sierra Court Suite J Project Number: Tosco# 11195 Reported: <br /> Dublin CA,94568 Project Manager: Doug Lee 12-Mar-02 07:34 <br /> Total Purgeable Hydrocarbons (C&C12),BTEX and MTBE by DHS LUFT - Quality Control <br /> Sequoia Analytical- Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2B27002-EPA 5030B McOH <br /> Blank(2B27002-BLK1) Prepared&Analyzed: 27-Feb-02 <br /> Purgeable Hydrocorbons(C6-C12) ND 1.0 mg/kg <br /> Benzene ND 0.0050 " <br /> Toluene ND 0.0050 " <br /> Ethylbenzene ND 0.0050 <br /> Xylenes(total) ND 0.0050 " <br /> Methyl tent-butyl ether(MTBE) ND 0.050 " <br /> Surrogate:a,a,a-TriJluorotoluene 0.670 0.600 112 40-140 <br /> LCS(2B27002-BSI) Prepared&Analyzed:27-Feb-02 <br /> Benzene 0.466 0.0050 mg/kg 0.800 58 50-150 <br /> Toluene 0.680 0.0050 0.800 85 50-150 <br /> - ylbenzene 0,704 0.0050 0.800 88 50-150 <br /> "`-fiylenes(total) 2.16 0.0050 2.40 90 50-150 <br /> Surrogate:a,a,a-Trrfluorotoluene 0.648 0.600 108 40-140 <br /> Matrix Spike(2B27002-MS1) Source:W202226-07 Prepared:27-Feb-02 Analyzed:01-Mar-02 <br /> Benzene 0.404 0.0050 ing/kg 0.800 ND 50 50-150 <br /> Toluene 0.670 0.0050 0.800 ND 84 50-150 <br /> Ethytbenzene 0.720 0.0050 0.800 ND 90 50-150 <br /> Xylenes(total) 2.14 0.0050 2.40 ND 89 50-150 <br /> Surrogate:a,a,a-Trrfluorotoluene 0.556 0.600 93 40-140 <br /> Matrix Spike Dup(2B27002-MSD1) Source:W202226-07 Prepared:27-Feb-02 Analyzed: 04-Mar-02 <br /> Benzene 0.408 0.0050 mg/kg 0.800 ND 51 50-150 1 20 <br /> Toluene 0.644 00050 0.800 ND 80 50-150 4 20 <br /> Ethylbenzene 0.664 0.0050 0.800 ND 83 50-150 8 20 <br /> Xylenes(total) 2.07 0.0050 2.40 ND 86 50.150 3 20 <br /> Surrogale:a,o,a-Trrfluorotoluene 0.456 0.600 76 40-140 <br /> #quoia Analytical- Walnut Creek 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 entirely. <br /> 4 of 6 <br />