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404 N Wiget Lane <br /> Sequoia Walnut Creek CA 94598 <br /> (925)988-9600 <br /> FAX(925)988-9673 <br /> Analytical www sequoialabs corn <br /> Gettler Ryan, Inc - Dublin Project Chevron <br /> 6747 Sierra Court Suite I Prolect Number Chevron# 9-8264 Reported <br /> Dublin CA 94568 Project Manager Deanna L Harding 06-Aug-01 09 54 <br /> MTBE Confirmation by EPA Method 8260B - Quality Control <br /> -----Sequoia Analytical-m-Walnut Creek <br />_ Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level—Result%RE(,—Limits RPD Ltmit—Notes <br /> Batch I H01024- FPA 50308(PIT) <br /> Blank(1H01024-BLK1) Prepared& Analyzed 02-Aug-01 <br /> Methyl Cert-butyl ether - - - - ND - --��-2 0 ugJl _-- <br /> Surrogate Dibromofluotomethane - - 478 -50 - --- - - - _-95 6 50-150 <br /> Surrogate 1 1-Drchloroethane-d4 498 500 996 50-150 <br /> LCS(IH01024-113SI) Prepared&Analyzed 02-Aug-01 <br /> Methyl tert-butyl ether - 57 9 20 ugll 500 116 70-130 <br /> Surrogate Dibromofluoromethane� - � 539 500 -�� 108 50-150 <br /> Surrogate 1 2-Dichloroethane-d4 532 500 106 50-150 <br /> Matrix Spike(IH01024-MSI) Source W107422-02 Prepared&Analyzed 02-Aug-0I <br /> Methyl tert-butyl ether --- -- 564 ----2 0 ug/1 500 -ND 113 60-150 -----_- -� <br /> Surrogate Dibromofluoromethane 454 - �F 500 908 50-150 <br /> Surrogate 12-Drchloroethane-d4 499 500 998 50-150 <br /> Matrix Spike Dup(11101024-MSDI) Source W107422-02 Prepared&Analyzed 02-Aug-01 <br /> Methyl tert-butyl ether 545 20 ug/l 500 ND 109 60-150 343 25 <br /> Surrogate Dtbromefluoromethane 506 500 101 50-150 <br /> Surrogate 1,2-Drchloroethane-d4 524 Soo 105 50-150 <br /> Sequoia Analytical - Walnut Creek The results to this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced in its entire <br /> Page 14 of 24 <br />