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404 N Wget lane / <br /> Walnut Geek,CA 94598 <br /> Sequoia (925)988-9600 <br /> FAX(925)988-%73 <br /> qIW Analytical www sequoWabscom <br /> Gettler Ryan,Inc -Dublin Project Chevron <br /> 6747 Sierra Court Suite J Project Number Chevron#9-9840 Reported <br /> Dublin CA,94568 Project Manager Deannal, Harding 13-Mar-01 16 55 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical -Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC L,umts RPD Lulut Notes <br /> Batch 1CO2013-EPA 5030B [PIT] <br /> Blank(ICO2013-BLKI) Prepared&Analyzed 02-Mar-01 <br /> Ethanol ND 500 ug/l <br /> tent-Butyl alcohol ND 50 <br /> Methyl tort-butyl ether ND 20 " <br /> Di-isopropyl ether ND 20 " <br /> Ethyl tent-butyl ether ND 20 " <br /> tort-Amyl methyl ether ND 20 " <br /> Surrogate Dibromofluoromethane 529 500 106 50.150 <br /> Surrogate 12 Dichloroethane-d4 486 500 972 50-150 <br /> Blank(1CO2013-BLK2) Prepared&Analyzed 05-Mar-01 <br /> Ethanol ND 500 ug/l - <br /> tert-Butyl alcohol ND 50 " <br /> Methyl.tern-butyl ether SID 20 - <br /> Di-isopropyl ether ND 20 " <br /> Ethyl tent-butyl ether ND 20 " <br /> tort-Amyl methyl ether ND 20 " <br /> Surrogate Dibromofluoromethane _501 —500 100--50-150_ <br /> Surrogate 1 Z Dichloroethane-d4 448 500 896 50-150 <br /> -�LCS(1CO2013-581)--— — Prepared-&Analyzed-02-Mar-01 --- — -- --- <br /> Methyl cert-butyl ether_ s_ 483 20 ug/l _ 500_ __ 966 _70-130 <br /> Surrogate Dibromofluoromethane 508 500 102 50-150 <br /> Surrogate 1,2 Dichloroethane-d4 489 500 978 50-150 <br /> LCS(1CO2013-BS2) Prepared&Analyzed 05-Mar-01 <br /> Methyl tort-butyl ether 46B 20 ug/l 500 936 70-130 <br /> Surrogate Dibromofluoromethane 507 Soo 101 50-150 <br /> Surrogate 1 2-Dichloroethane-d4 457 Soo 914 50-150 <br /> Sequoia Analytical-Walnut Creek The results in this report apply to the samples analyaed in accordance with the churn of <br /> custody documem This analytical report must be reproduced in its enn* <br /> Page 7 of 10 <br /> l— <br />