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404 N %MSet Lane <br /> Sequoia Walnut Creek CA 94598 <br /> (925)988-9600 <br /> Analytical FAX quolaabs labs25) c 73 <br /> wwry sequocom <br /> Gettler Ryan,Inc -Dubhn Project Tosca <br /> 6747 Sierra Court Suite J Project Number Tosca# 11192 Reported <br /> Dubhu CA,94568 Project Manager Doug Lee 11-Jan-01 18 32 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical -Walnut Creek <br /> Reporlu►g Spike Source %REC RPD <br /> byte Result Lumt Umts Level Result %REC Lumts RPD Lutist Notes <br /> Batch lAO8024-EPA 5030B[PIT] <br /> Blank(1A08024-BLKI) Prepared&Analyzed 08-Jan-01 <br /> Ethanol ND 500 ug/i <br /> tent-Butyl alcohol ND 50 " <br /> Methyl tart-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 /> Surrogate Dtbromofluoromethane 470 Soo 940 50.150 <br /> Surrogate 1 1-Dlchloroodume-d4 390 Soo 7g0 50-150 <br /> Blank(1A08024-BLK2) Prepared&Analyzed 09-Jan-01 <br /> Ethanol ND 500 ug/1 <br /> to 6Bu <br /> alcohol ND 50 " <br /> 1 tett-butyl ether ND 20 " <br /> t-isopropyl ether ND 20 „ <br /> Ethyl tart-butyl ether ND 20 " <br /> tart-Amyl methyl ether ND 20 " <br /> Surrogate Drbromofluoromethane 450 500 900 50.150 <br /> Surrogate 4 2-Dtchloroethane-d4 380 500 760 50.150 <br /> LCS(1A08024-BSI) Prepared&Analyzed 08-Jan-01 <br /> Methyl tent-butyl other 413 20 ug/l 500 826 70-130 <br /> Surrogate Drbromofluoromethane 48.0 11Soo 960 50.150 <br /> Surrogate 1 2-Dtchloroethane-d4 3&0 It Soo 760 50-150 <br /> LCS(1A08024 BS2) Prepared&Analyzed 09-Jan-01 <br /> Methyl text-butyl ether 390 20 ug/l 500 780 70-130 <br /> Surrogate Dibromofluoromethane 470 500 940 50-iso <br /> Surrogate 12-Dschloroethane-d4 380 Soo 760 50-150 <br /> guoia Analytical-Walnut Creek The results to tins report apply to the samples analyzed in accordance with the chain of <br /> custody document. Thu analytical report must be reproduced to its entirely <br /> Page 4 of 7 <br />