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1551 Industrial Road <br /> Sequoia San Carlos A94070 <br /> (6.50) <br /> [650)232-9600 <br /> 12 <br /> Vo Analytical f FAXe650ialabs orn <br /> www sequoialabs com <br /> Getiler-Rvan/Geostrategtes(I Protect Unoca)(4) <br /> 6747 Sierra Court. Suite I Protect Number Unocal SSit5098 Stockton CA Reported <br /> Dublin CA 94568 Protect Manager Deanna Harding 01/01/02 11 05 <br /> - - - -- Volatile Organic Oxygenated Compounds by EPA-Method 8260B - Quality Control. _ <br />— -- - - - - - - Sequoia Analytical - San Carlos - - - I -- <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 1120027- EPA 5030B 1P/Tl <br /> Matrix Spike Dup(1120027-MSDl)� _ _Source`L]]2030-08—-- Prepared&Analyzed 12/07/01--- - `- - <br /> Benzene 50 7 10 ug/1 SO 0 ND 101 60-140 137 25 <br /> Toluene 48 6 10 500 ND 972 60-140 1 43 25 <br /> Methyl teri-butyl ether 488 10 500 ND 97 6 60-140 526 25 <br /> Surrogate 1 2-Dichloroethane-d4 25 0 25 0 100 70-130 <br /> Surrogate Toluene-d8 25 7 25 0 103 70-130 <br /> Surrogate 4-BFB 22 9 25 0 916 70-130 <br /> Batch 1120032 - EPA 5030E JP/Tl <br /> Blank(1120032-BLK1) Prepared&Analyzed 12/07/01 <br /> Y 1,2-Dibromoethane(EDB) ND 10 u@/1 - - - <br /> 12-Dichloroethane ND 10 " <br /> Benzene ND 10 , <br /> Toluene - ND - 10 <br /> Ethylbenzene ND 10 " <br /> Xylenes(total) ND 1 0 " <br /> Ethanol ND 500 " <br /> Methyl ten-butyl ether ND 10 " <br /> Di-isopropyl ether —_- -- ND— ---1 -- <br /> Tert-butyl alcohol ND 20 " <br /> Ethyl leis-butyl ether- - --- - - - ---ND-- 1 0 --- -- -- -- —-- --- - - - - - -- _ _ _ <br /> Ten-amyl methyl ether ND 10 " <br /> Surrogate 1,2-Dtchloroethane-d4 25 6 230 102 70-130 <br /> Surrogate Toluene-d8 243 250 972 70-130 <br /> Surrogate 4-BFB 23 7 250 948 70-130 <br /> L_CS(1120032-BSI) _ „ Prepared&Analyzed 12/07/01 <br /> Benzene 53 6 1 0 ug/l Soo 107 70-130 <br /> Toluene 500 1 0 500 100 70-130 <br /> Methyl tert-butyl ether 478 10 500 956 70-130 <br /> Surrogate 1,2-Dichloroethane-d4 259 250 104 70-130 <br /> Surrogate Toluene-d8 243 250 971 70-130 <br /> Surrogate 4-BFB 247 250 988 70-130 <br /> Sequoia Analytical-San Carlos The results to this report apply to the samples analyzed in accordance with the chain <br /> custody document This analytical report must be reproduced to its entirety <br /> Page 32 of 34 <br />