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r <br /> 819 <br /> ker <br /> ic 8 <br /> Sequoia Sacramento, <br /> 5834 <br /> Sacramento, 92 -9600 <br /> (9]6)921-9600 <br /> � Analytical FAX(916)921sco r <br /> a 3 1 r <br /> www sequoialabco � <br /> 1 r <br /> Gettler-Ryan-Dublin Prosect Former Unocal 0187, Stockton,CA 5302221 <br /> 6747 Sierra Court,Ste J Project Number NIA Reported <br /> Dublin CA,94568 Project Manager Deanna L Harding 02/28/03 19 02 <br /> Volatile organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Sacramento - - - <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3020263-EPA 50301BJP/TJ , <br /> Blank(3020263-BLKI) Prepared 02/19/03 Analyzed 02/20/03 <br /> Methyl tent-butyl ether ND 050 ug/l <br /> Di-isopropyl ether ND 050 " <br /> Ethyl ten-butyl ether ND 050 " <br /> Tert-amyl meihyl ether ND 050 t <br /> Ethanol ND 50 " <br /> Surrogate 1 1-DCA-d4 256 250 101 60-140 <br /> Laboratory Control Sample(3020263-BSI) Prepared 02/19/03 Analyzed 02/20/03 <br /> Methyl tert-butyl ether 233 050 ugA 250 93 60-140 <br /> Surrogate 12-DCA-d4 254 250 101 60-140 } <br /> Matrix Spike(3020263-MSI) Source.5302221-02 Prepared 02/19/03 Analyzed 02/20/03 _ <br /> Methyl tert-butyl ether 245 050 UBA 250 054 96 60-140 <br /> Surrogate 12-DCA-d4 � 255 � - 250 102 60-140 <br /> Matrix Spike Dup(3020263-MSDI)- Source-S302221-02 _ -Prepared 02/19/03 Analyzed 02/20/03 <br /> Methyl ten-butyl ether 232 050 ug/l 250 054 91 60-140 5 25 <br /> Surrogate 11-DCA-d4 258 250 103 60-140 <br /> Batch 3020288-EPA 5030B EP/T] <br /> Blank(3020288-BLKI) Prepared&Analyzed 02/20/03 <br /> Tert-butyl alcohol ND so ug/l - <br /> Methyl ten-butyl ether ND 050 " <br /> Di-isopropyl ether ND 050 " <br /> Ethyl tert-butyl ether ND 050 " <br /> Teri-amyl methyl ether ND 050 " <br /> Ethanol ND 50 " <br /> Surrogate 1 2-DCA-d4 276 250 110 60-140 <br /> Sequoia Analytical - Sacramento The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless otherwise stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 31 of 33 <br />