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819 Sinker Ave Ste 8 <br /> nto,CA <br /> 4DSequoia Sacram(916)921g5834 9600 <br /> 1W Analytical wwseqFAX 6ialabs om <br /> www sequoialabs coin <br /> Gettler-Ryan-Dublin Trolect Former Unocal 0187,Stockton,CA 5302221 <br /> 6747 Sierra Court,Ste ] Project Number N/A Reported <br /> Dublin CA,94568 Project Manager Deanna L Harding - 02/28/03 19 02 <br /> Volatile Organic Compounds by EPA Metbod 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 3020220-EPA 5030B JP/TJ <br /> Blank(3020220-BLKI) Prepared&Analyzed 02/18/03 <br /> Teri-butyl alcohol ND 50 ug/l <br /> Methyl teri-butyl ether ND 050 " <br /> Di-isopropyl ether ND 050 " <br /> Ethyl teri-butyl ether ND 050 " <br /> Tert-amyl methyl ether ND 050 " <br /> Ethanol ND 50 " <br /> Surrogate 11-DCA-d4 294- 250 118 60-140 <br /> Laboratory Control Sample(3020220-BSI) Pre ared&Analyzed 02/18/03 <br /> Methyl tert butyl ether 203 050 ug/I 224 91 60-140 <br /> Surrogate 1 2-DCA-d4 304 250 111 60-140 <br /> Matrix Spike(3020220-MSI) Source 5302170-14 Prepared 02/18/03 Analyzed 02/19/03 <br /> Methyl tert-butyl ether 229 050 ug/l 224 ND 102 60-140 <br /> Surrogate 11-DCA-d4 311 250 119 60-140 <br /> Matrix Spike Du (3020220-MSDI) Source 5302170-14 Prepared 02/18/03 Analyzed 02/19/03 <br /> Methyl tert-butyl ether 246 050 ugA 224 ND 110 60-140 7 25 <br /> Surrogate 1 1-DCA-d4 312 250 125 60-140 <br /> Batch 3020233-EPA 5030B IPITI <br /> Blank(3020233-BLKI) Prepared& Analyzed 02/18/03 <br /> Tert-butyl alcohol ND - 50 ug/l <br /> Methyl tert-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 1-DCA-d4 232 250 93 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 29 of 33 <br />