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404 N.Wiget Lane <br /> ` Sequoia Walnut Creek,CA <br /> 94598 <br /> (925)988-9600-9600 <br /> FAX(925)988-9673 <br /> Analytical . : wwwsequoiaiabs.com <br /> Gettler Ryan,Inc.-Dublin Project: Chevron <br /> 6747 Sierra Court Suite 3 Project Number. Chevron#9-3232 Reported: <br /> Dublin CA,94568 Project Manager: Deanna L.Harding 03-Aug-01 07:33 <br /> Total Purgeable Hydrocarbons (C6-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 l G20003-EPA 5030B P/T - <br /> Blank(1G20003-BLK1) Prepared&Analyzed:20-Jul-01 <br /> Purgeable Hydrocarbons ND 54 ugll <br /> Benzene ND 0.50 " <br /> Toluene ND 0.50 " <br /> Ethylbenzene ND 0.50 ' <br /> Xylenes(total) ND 0.50 ; <br /> Methyl tert-butyl ether ND 2.5 " <br /> Surrogate:a,a,a-Trifluorotoluene 29.8 30.0 99.3 70-130 <br /> Blank(1G20003-BLK2) Prepared&Analyzed:23-Jul-01 <br /> Purgeable Hydrocarbons ND 50 ug/l <br /> Benzene ND 0.50 " <br /> Toluene ND 0.50 " <br /> Ethylbenzene ND 0.50 <br /> Xylenes(total) ND 0.50 <br /> Methyl tert-butyl ether ND 2.5 " <br /> Surrogate:a,a,a-Trifluorotoluene 28.7 30.0 95.7 70-130 <br /> Blank(1G20003-BLK3) "" Prepared&Analyzed:24-Jul-01 <br /> Purgeable Hydrocarbons . ND 50 ugA } <br /> Benzene ND 0.50 <br /> Toluene ND 0.50 " <br /> Ethylbenzene ND 0.50 " <br /> Xylenes(total) ND 0.50 <br /> Methyl tert-butyl ether ND 2.5 " <br /> Surrogate:a,a,o-Tris luorotoluene 28.0 " - 30.0 93.3 70-130 <br /> Blank(1G20003-BLK4) Prepared&Analyzed:25-Jul-0I <br /> Purgeable Hydrocarbons ND 50 ugll <br /> Benzene ND 0.50 " <br /> Toluene ND 0.50 " <br /> Ethylbenzene ND 0.50 " <br /> Xylenes(total) ND 0.50 " <br /> Methyl tert-butyl ether ND 2.5 " <br /> Surrogate:a,a,a-Trifluorotoluene 28.4 30.0 94.7 70-130 <br /> Sequoia 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 enti` ' <br /> Page 5 of 10 <br />