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4 <br /> Gettler-Ryan/Geostrategies(l) Project Unocal(4) <br /> 6747 Sierra Court, Suite J Protect Number Former Unocal SS#2859/1665 Pacific Ave Reported r# <br /> Dublin CA,94568 Project M=Pr Deanna Harding 06/21/01 12 03 <br /> Volatile Organic 8 Oxygenated Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - San Carlos <br /> Reporumg spiile Soured %RHC RPD <br /> Analyte Result Lmut ands Level Result lumc Limns RPD Limp Notes <br /> Batch 1060033-EPA 5030B SPIT] <br /> Blank(1060033-SLK1) Prepared&Analyzed 06/07/01 <br /> Ethanol ND 1000 ug/l <br /> 1,2-Dibromoethane ND 20 " <br /> 1,2-1)tchloroethane ND 20 " <br /> Eh-isopropyl ether ND 20 " <br /> Ethyl tert-butyl ether ND 20 " <br /> Methyl tert-butyl ether ND 20 " <br /> 'Pert-amyl methyl ether ND 20 " <br /> Ted-butyl alcohol - ND-- 100 " - <br /> Surrogate 1,2-Dichloroethane-d4 500 500 100 76-114 <br /> Surrogate Toluene-d8 489 - " 500 r 978 88-110 <br /> Blank(1060033-BLK2) Prepared&Analyzed 06/11/01 <br /> Ethanol ND 1000 ug/l <br /> 1,2-Dibromoethane ND 20 " <br /> 1,2-Dlchlonoethane ND 20 " <br /> Di-isopropyl ether ND 2 0 " <br /> Ethyl tent-butyl etLer ND—2 0—" <br /> - -- <br /> Methyl tert-butyl ether ND 20 " <br /> - - -Tert-amyl methyl ether — - ND �2 OT <br /> Tert-butyl alcohol _ _ _ ND __ -- 100 <br /> Surrogate 12-Dichloroethane-d4 478 500 956 76-114 <br /> Surrogate Toluene-d8 487 Soo 974 88-110 <br /> Blank(1060033-BLK3) Prepared&Analyzed 06/12/01 r <br /> Ethanol ND 1000 ug/l <br /> 1,2-Dibmmoethane ND 20 " <br /> 1,2-Dichlometbane ND 20 " <br /> Di-tsopropyl ether ND 20 " <br /> Ethyl tert-butyl ether ND 20 " <br /> Methyl tert-butyl ether ND 20 " <br /> Teit-amyl methyl ether ND 20 " <br /> Ten-butyl alcohol ND 100 " <br /> Surrogate 1,2-Dichloroethane-d4 488 500 976 76-114 <br /> Surrogate Toluene-d8 479 500 958 88-110 <br /> Sequoia Analytical-Sari Carlos The results in this report apply to the samples analyzed in accordance with the ch <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 17 of 20 <br />