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i 5 <br /> Gettler-Ryan/Geostrategies(1) Project Unocal(4) <br /> 6747 Sierra Court,Suite] Project Number Former Unocal SS#0187 Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 05/30/01 13 32 <br /> Volat>le Organic Oxygenated Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - San Carlos <br /> Reporting Spike Sovrce %REC RPD <br /> Analyte -- Result- - ,_~Limit Umts w Leve] Result -%REC " Limits L RPD Lamit -Notes <br /> Batch 1050084-EPA 5030B lPIT] <br /> Matrix Spike Dup(1050084-M5D1) Source L105155-04 Prepared&Analyzed 05/19/01 <br /> Methyl tent-butyl ether 782 200 ug/l 500 354 856 60-140 0 764 25 <br /> Surrogate 1,1-Dichloroethane-d4 427 500 854 76-114 <br /> Batch 1050085-EPA 5030B (PIT <br /> Blank(1050085-BLKI) Prepared&Analyzed 05/19/01 <br /> Ethanol ND 1000 u9/1 <br /> Tert-butyl alcohol ND 100 " <br /> Methyl tort-butyl ether ND 200 " <br /> Di-isopropyl ether ND 200 " <br /> Ethyl tert-butyl ether - ND 200 <br /> Tert-amyl methyl ether _ _ ND 200 " <br /> Surrogate 1,2-Dwhloroethane-d4 483 500 966 76-114 <br /> Blank(1050085-BLK2) Prepared&Analyzed 05/21/01 <br /> Ethanol ND 1000 ug/l <br /> —Tett-butyl alcoholT <br /> Methyl tert-butyl ether ND 200 " <br />------Di-isopropyl ether-- - <br /> Ethyl tert-butyl ether ND 200 " <br /> Tert-amyl methyl ether _ - __ND -__-—200 - <br /> Surrogate 1 2-Dtchloroethane-d4 456 500 911 76-114 <br /> LCS(1050085-BSI) Prepared&Analyzed 05/19/01 <br /> Methyl tort-butyl ether 449 200 ugtl Soo 898 70-130 <br /> Surrogate 1 2-Dtchloroethane-d4 492 500 984 76-114 <br /> Sequoia Analytical-San Carlos The results in this report apply to the samples analyzed in accordance with the ch <br /> custody document Thus analytical report must be reproduced in its entirety <br /> Page 31 of 33 <br />