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404 N Wiget lane <br /> Sequoia Walnut Creek CA 94598 <br /> 4 (szs)s8s-96009600 <br /> FAX(925)988-%73 <br /> rettl,r <br /> Analytical www sequoialabs cornn,Inc -Dublin Project Chevron <br /> 6747 Sierra Court Suite J Project Number Chevron# 9-8264 Reported <br /> Dublin CA,94568 Project Manager Deanna L Harding 06-Aug-01 09 54 <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 1626002- EPA 50308 PIT <br /> Blank(IG26002-BLK1) Prepared& Analyzed 26-Jul-01 <br /> Purgeable I tydrocarbons N D 50 ug/i — <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 25 " <br /> Surrogate a a a-Triuorotoluene 303 300 101 70-130 <br /> Blank(IG26002-BLK2) Prepared&Analyzed 29-Jul-01 <br /> Purgeable Hydrocarbons ND 50 ug/l T <br /> Benzene ND 050 " <br /> Toluene ND 050 " <br /> Wr(benzene ND 0 50 <br /> nes(total) NO 0 50 " <br /> Methyl tert-butyl ether ND 25 " <br /> Surrogate a a a-Tref luorotoluene 304 � 300 101 70-130 <br /> Blank(1626002-BLK3) Prepared&Analyzed 30-Jul-01 <br /> Purgeable Hydrocarbons - ND_ 50 ugly <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-Tr ftuorotoluene 297 300 990 70-130 <br /> LCS(IG26002-BSI) Prepared&Analyzed 26-Jul-01 <br /> Benzene -- 18 3 050 ugli 200 91 5 70-130 <br /> Toluene 194 0 50 " 200 97 0 70-130 <br /> Ethylbenzene 201 0 50 " 200 100 70-130 <br /> Xylenes(total) 604 050 600 101 70-130 <br /> Surrogate a a a-Triuorotaluene 300 —YO--O--100 70-130 <br /> Sequoia Analytical- Walnut Creek Ae 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 11 of 24 <br />