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8 t9 Sinker Ave Ste 8 <br /> Sacramento,CA 95834 <br /> Sequoia (916)921 9600 <br /> FAX(916)921 A 100 <br /> Analytical www sequoialabs eon~ <br /> 3e yan-Dublin Project Former Unocal 0187,Stockton,CA S302221 <br /> R47 Sierra Court,Ste ] Project Number NIA Reported <br /> aublin 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 />'nalyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br />,atch 3020288-EPA 5030B PIT <br /> aboratory Control Sample(3020288-BS1) Prepared&Analyzed 02/20/03 <br />]ethyl tent-butyl ether 448 050 ugA 448 100 60-140 <br /> urrogaie 1 2-DCA-d4 265 11 250 106 60-140 <br /> Matrix S Ike(3020288-MS1) Source-S302197-05 Prepared 02/20/03 Analyzed 02/21/03 <br /> Methyl tert-butyl ether 238 050 ugA 250 ND 95 60-140 <br />,urrogate 1 2-DCA-d4 265 250 106 60-140 <br /> Matrix Spike Du (3020288-MSD1) Source 5302197-05 Prepared 02/20/03 Analyzed 02/21/03 <br /> Methyl len-butyl ether 227 050 ugll 250 ND 91 60-140 5 25 <br /> Alm <br /> SAWe 1 2-DCA-d4 258 250 103 60-140 <br /> Oia Analytical- Sacramento The results in this report apply to the samples analyzed in accordance with the chain aJ <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 32 of 33 <br />