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404 N Wlget Lane <br /> Sequoia Walnut (925)988-9600 <br /> Creek.CA Sk4598 <br /> FAX(925)988-9673 <br /> Analytical www,-,eq"°Wkbs 00m <br /> 00 <br /> Gettler Ryan,Inc -Dublin Project Unocal <br /> 6747 Sierra Covet Suite J Project Number Unocal#8671 Reported <br /> Dublin CA,94568 Project Manager Deanna L Harding 21-Dec-00 09 23 <br /> Volatile organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical -Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Lmut Units Level Result %REC Limits RPD Limit Notes <br /> Batch OL07006-EPA 5030B [P/11 <br /> Blank(OL07006-BLKl) Prepared&Analyzed 05-Dec-00 <br /> tett-Butyl alcohol ND so ug/1 <br /> Methyl tet-butyl ether ND 20 " <br /> Di-isopropyl ether ND 20 " <br /> Ethyl tet-butyl ether ND 20 " <br /> tort-Amyl methyl ether ND 20 " <br /> Surrogate Dtbromofluoromethmre 510 Soo 102 50-150 <br /> Surrogate 1,2-DicNoraetluarte-d4 450 500 9Q 0 50-150 <br /> LCS(OL07006-BSI) Prepared&Analyzed 05-Dec-00 <br /> Methyl tort-butyl ether 590 20 ug/I 500 118 70-130 <br /> Surrogate Dtbromofhioromethow 520 Soo 104 50-150 <br /> S ate 12 Dichloroethmw-M 46�0 500 920 50-150 <br /> Spike(OL07006 MSI) Source W012066-04 Prepared 07-Dec-00 Analyzed 09-Dec-00 <br /> Methyl tat-bityl ether 480 20 ug/1 500 ND 960 60-150 <br /> Surrogate DibromgfMoromed mre 570 500 114 50-150 <br /> Surrogate 1,2 Dichloroedww-& 4a 0 500 800 50-150 <br /> Matrix Spike Dup(OL07006-MSD1) Source W012066-04 Prepared 07-Dec-00 Analyzed 08-Dec-00 <br /> Methyl tert-butyl ether 430 20 ug/1 500 ND 960 60-150 Ito 25 <br /> Surrogate Dlbromofluoromethmre 470 500 940 50-150 <br /> Surrogate 1,2-Dich1oroed&ww-d4 390 500 780 50-150 <br /> la Analytical-Walnut Creek The results to tits report apply to the samples analyzed in accordmice with the chain of <br /> custody document This analytical report must be reproduced to its enhrery <br /> Page 7 of 8 <br />