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Sequoia an Carlos <br /> nal Road <br /> 4D— San Carlos CA 94070 <br /> mwAnalytical FAX(650}232-9600 <br /> (654)232 9612 <br /> www sequoialabs corn <br /> Gettler-Ryan/Geostrategtes(I) Project Unocal(4) <br /> 6747 Sierra Court, Suite J Project Number Former Unocal#5098& Montgmery Ward Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 03/26/02 12 44 <br /> Volatile Organic Oxygenated Compounds by EPA Method 8260E - Quality Control <br /> Sequoia Analytical - San Carlos <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2030028- EPA 5030B JP/TJ <br /> Blank(2030028-BLK2) Prepared&Analyzed 03/14/02 <br /> Ethanol ND 500 ug/l <br /> Tert-butyl alcohol ND 20 " <br /> Methyl tert-butyl ether ND 1 0 " <br /> Di-isopropyl ether ND 1 0 <br /> Ethyl tert-butyl ether ND 1 0 " <br /> Tert-amyl methyl ether ND 1 0 <br /> Surrogate 12-Dichloroethane-d4 471 Soo 941 70-130 <br /> LCS(2030028-BSI) Prepared& Analyzed 03/13/02 <br /> Methyl teri-butyl ether 525 1 0 ug/l 500 105 70-130 <br /> Surrogate 1 1-Dichlw oethane-d4 529 500 106 70-130 <br /> LCS(2030028-BS2) Prepared&Analyzed 03/14/02 <br /> Methyl tert-butyl ether 495 1 0 ug/l Soo 990 70-130 <br /> Surrogate 12-Dichloroethane-d4 499 1 1 500 998 70-130 <br /> Matrix Spike(2030028-MSI) Source L203050-06 Prepared&Analyzed 03/13/02 <br /> Methyl tert-butyl ether 73 7 1 0 ug/1 500 22 103 60-140 <br /> Surrogate 1 2-Dichloroethane-d4 543 500 109 70 130 <br /> Matrix Spike Dup(2030028-MSDI) - Source L203050-06 Prepared&Analyzed 03/13/02 <br /> ----Methyl tert-butyl ether--_---— 78 7-- .. 1 0- ug/]--50 0— 22---1 1360-1406 56--25 - - -- <br /> Surrogate 1 2-Dichloroethane-d4 _ �T 545 Y_ _ T _ 500 _-_ 109 70-130_ <br /> Batch 2030031 -EPA 5030B [P/TI <br /> Blank(2030031-BLKI) _ _ Prepared& Analyzed 03/14/02 <br /> Ethanol ND 500 ug/1 - <br /> Tert-butyl alcohol ND 20 <br /> Methyl tert-butyl ether ND 1 0 " <br /> Di-isopropyl ether ND 1 0 " <br /> Ethyl tert-butyl ether ND 1 0 <br /> Tert-amy]methyl ether ND 1 0 " <br /> Suri ogate 1 2-Dichloroethane-d4 509 500 101 70-130 <br /> Sequoia Analytical- San Carlos The tesults in this report apply to the samples analyzed in accordance with lite chant of <br /> custody document This analytical repos t must be reproduced in its entirety <br /> Page 89 of 91 ' <br />