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404 N Wget Lane <br /> 1i. <br /> Sequoia Walnut Geek CA 94598 <br /> (925)988-9600 <br /> Analytical ww FAX 988-9673 <br /> wseequo quofalahS coin <br /> er Ryan,Inc -Dublm Project Tosco <br /> 6747 Sierra Court Suite J Project Number Tosco SS# 5896 Reported <br /> Dubttn CA,94568 Project Manager Deanna L Harding 26-Feb-01 07 38 <br /> Volatile Organic Compounds by EPA Method 8260B-Quality Control <br /> Sequoia Analytical -Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> Analyte Reporting <br /> Lmut Uruts Level Result %RFC Lunits RPD Limit Nates <br /> Batch 1B09007-EPA 5030B[P/11 <br /> Blank(1B09007-BLKI) Prepared&Analyzed 09-Feb-01 <br /> Ethanol ND 500 ug/1 <br /> teit-Butyl alcohol ND 50 " <br /> Methyl tert-butyl ether ND 20 <br /> Di isopropyl ether ND 20 " <br /> Ethyl tett-butyl ether ND 20 " <br /> tert Amyl methyl ether ND 20 <br /> 1 2-Dichloroethane ND 20 " <br /> Ethylene dibrortude ND 20 " <br /> Surrogate Dtbromofluoromethane 53 0 <br /> 500 106 50.150 <br /> Surrogate 12-Dtchloroethane-d4 470 500 940 50-150 <br /> Blank(IB09007-BLK2) Prepared&Analyzed 12-Feb-01 <br /> E ND 500 ugfl <br /> t yl alcohol ND 50 " <br /> Methyl tert-butyl ether ND 20 " <br /> Dr isopropyl ether ND 20 " <br /> Ethyl tert-butyl ether ND 20 " <br /> tert-Amyl methyl ether ND 20 " <br /> 1 2-Dichloroethane ND 20 " <br /> Ethylene dibrorrude ND 20 " <br /> Surrogate Dibromofluorromethane 530 500 106 SO-150 <br /> Surrogate 12 Dichloroerhane-d4 430 500 860 50-150 <br /> Blank(1809007-BLK3) Prepared&Analyzed 12-Feb-01 <br /> Ethanol ND 500 ug/l <br /> tert-Butyl alcohol ND 50 <br /> Methyl tert-butyl ether ND 20 „ <br /> Di-isopropyl ether ND 20 " <br /> Ethyl tett-butyl ether ND 20 „ <br /> tert-Amyl methyl ether ND 20 " <br /> 1,2-Drchloroethane ND 20 " <br /> Ethylene dibrormde ND 20 " <br /> Surrogate Drbromofluoromethane 250 250 100 50-150 <br /> Surrogate 12-Dichloroethane-d4 210 250 840 50-150 <br /> Sequoia Analytical-Walnut Creek The results in Yhts 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 6 of 10 <br />