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404 N Wlget Lane <br /> Sequoia Walnut Creek C94598 <br /> (925)988-9600 <br /> 4 <br /> a- ) <br /> FAX(925)988-9673 <br /> Analytical www sequolalabs corn <br /> 'MrAW <br /> Gettler Ryan,Inc -Dublin Project Tosco <br /> 6747 Sierra Court suite J Project Number Tosco# 11192 Reported <br /> Dublin CA,94568 Project Manager Doug Lee 16-Jan-01 07 47 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical -Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Luft units Level Result %REC Litntts RPD Ltmtt Notes <br /> Batch 1A05009-EPA 5030B[Prfl <br /> Blank(1A05009-BLK1) Prepared&Analyzed 05-Jan-01 <br /> Ethanol ND 500 ug/t <br /> tet-Butyl alcohol ND 50 " <br /> Methyl tort-butyl ether ND 20 <br /> Di-isopropyl ether ND 20 " <br /> Ethyl tet-butyl ether ND 20 <br /> tort Amyl methyl ether ND 20 " <br /> Surrogate Dibromofluoromethane 4&0 500 960 50-150 <br /> Surrogate 12-Drchlorcethane-d4 460 500 920 50.150 <br /> Blank(1A05009-BLK2) Prepared&Analyzed 08-Jan-01 <br /> Ethanol ND 500 uga <br /> tert-Butyl alcohol ND 50 " <br /> 1 tet-butyl ether ND 20 <br /> .propyl ether ND 20 " <br /> Ethyl tert-butyl ether ND 20 " <br /> tert-Amyl methyl ether ND 20 " <br /> Surrogate Dibromofluoromethane 490 500 980 50.150 <br /> Surrogate 1,2-Dichloroethane-d4 520 500 104 50-150 <br /> LCS(1A05009-BSI) Prepared&Analyzed 05-Jan-01 <br /> Methyl tet-butyl ether 543 20 ugA 500 109 70-130 <br /> Surrogate Dibromofluoromethane 490 500 9&0 50-150 <br /> Surrogate 12-Dichloroethane-d4 4&0 500 960 50-150 <br /> LCS(1A05009-BS2) Prepared&Analyzed 08-Jan-01 <br /> Methyl tart-butyl ether 449 20 ng/I 500 898 70-130 <br /> Surrogate Dibromofluoromethane, 490 500 980 so-Iso <br /> Surrogate 1,2-Dichloroethane-d4 530 Soo 106 50-150 <br /> uoia Analytical-Walnut Creek The results in thus report apply to the samples analyzed in accordance with the chain of <br /> custody document Thus analytical report must be reproduced in its entirety <br /> Page 5 of 7 <br />