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r <br /> 404 N.Wtget Lane <br /> 4DSequoia Walnut Creek,CA 94598 <br /> (925)988-9600 <br /> �,,,,� Analytical Fw. f925)9abs.co 3 <br /> www.sequolalabs.com <br /> ttler Ryan,Inc_-Dublin Project: Chevron <br /> 6747 Sierra Court Suite J Project Number: Chevron#9-6258 Reported: <br /> Dublin CA,94568 Project Manager: Deanna L.Harding 11-Aug-00 07:27 <br /> Total Purgeable Hydrocarbons (C6-Ct2), BTEX and MTBE by DHS LUFT- Quality Control <br /> Sequoia Analytical -Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Litnit Units Level Result %REC Limits RPD Limit Notes <br /> Batch OH01002-EPA 5030B [PIT] <br /> Blank(OH01002-BLK1) Prepared&Analyzed:O1-Aug-00 <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 tett-butyl ether ND 2.5 " <br /> Surrogate:qqa-Trifluororoluene 19.1 30.0 97.0 70-130 <br /> LCS(OH01002-BSI) Prepared&Analyzed:01 Aug-00 <br /> Benzene 19.0 0.50 ug/1 20.0 95.0 70-130 <br /> Toluene 19.5 0.50 20.0 97.5 70-130 <br /> Ethylbenzene 20.3 0.50 20.0 101 70-130 <br /> ? s(tow) 60.5 0.50 60.0 101 70-130 <br /> Surrogate:a a,a-Trifluororoluene 28.9 3a o 96.3 70-130 <br /> Matrix Spike(OH01002-MSI) Source:W007507-02 Prepared&Analyzed:O1 Aug-00 <br /> Benzene 17.6 0.50 ug/I 20.0 ND 88.0 70-130 <br /> Toluene 17.8 0.50 20.0 ND 89.0 70-130 <br /> Etbylbenzene 18.7 0.50 20.0 ND 93.5 70-130 <br /> Xylenes(total) 55.2 0.50 60.0 ND 92.0 70-130 <br /> Surrogate:a as-Tris luorotoluem 1d1 30.0 93.7 70.130 <br /> Matrix Spike Dup(OH01002-MSDI) Source:W007507-02 Prepared&Analyzed:O1 Aug-00 <br /> Benzene 16.9 0.50 ugll 20.0 ND 84.5 70-130 4.06 20 <br /> Toluene 17.0 0.50 20.0 ND 85.0 70-130 4.60 20 <br /> Ethylbenzene 18.1 0.50 20.0 ND 90.5 70-130 3.26 20 <br /> Xylenes(total) 53.1 0.50 60.0 ND 88.5 70-130 3.88 20 <br /> Surrogate:qqa-Trifluorotohrene 18.8 30.0 9Q0 70-130 <br /> Sequoia Analytical-Walnut Creek The results in rids report apply to the samples analyzed in accordance with the chain of <br /> custody dacume►rt.This analytical report must be reproduced in its entirety. <br /> Page 6of9 <br />