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819 Sinker Ave Ste 8 <br /> Sacramento CA 95834 <br /> 6) Sequoia (916)921-9600 <br /> FAX(916)92 1-0 100 <br /> IwAnalytical www sequoialabs corn <br /> Ryan-Dublin Project Fortner Unocal 2859,Stockton,CA 5303055 <br /> 674 Sierra Court,Ste J Project Number N/A Reported <br /> Dublin CA,94568 Project Manager Deanna L Harding 03/19/03 18 34 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Sacramento <br /> Reportmg Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3030181 -EPA 5030B JP/TI <br /> Matrix Spike(3030181-MSI) Source 5303052-09 Prepared 03/12/03 Analyzed 03/13/03 <br /> Methyl tert-butyl ether 212 20 ugA 224 090 91 60-140 <br /> Surrogate 1 1-DCA-d4 285 250 114 60-140 <br /> Matrix Spike Du (3030181-MSDI) Source 5303052-09 Prepared 03/12/03 Analyzed 03/13/03 <br /> Methyl tert-butyl ether 18 5 20 ug/1 224 090 79 60-140 14 25 <br /> Sur rogate 1 2-DCA-d4 276 250 110 60-140 <br /> Batch 3030194-EPA 5030B IP/TJ <br /> Blank(3030194-BLKI) Prepared& Analyzed 03/13/03 <br /> i <br /> TI y]alcohol ND 100 ugll <br /> M Cert-butyl ether ND 20 " <br /> Di-isopropyl ether ND 20 " <br /> Ethyl tert-butyl ether ND 2 0 <br /> Ten-amyl methyl ether ND 20 <br /> Ethanol ND 500 " <br /> 1,2-13ichloroethane ND 20 " <br /> 1,2-Dibromoethane(EDB) ND 2 0 " <br /> Surrogate 1 2-DCA-d4 206 250 82 60-140 <br /> Laboratory Control Sample(3030194-BSI) Prepared&Analyzed 03/13/03 <br /> Methyl ten-butyl ether 161 20 ugly 224 72 60-140 <br /> Surrogate 1 2-DCA-d4 258 250 103 60-140 <br /> Matrix Spike(3030194-MSI) Source 5303055-20 Prepared 03/13/03 Analyzed 03/14/03 <br /> Methyl tert-butyl ether 140 20 ugA 224 ND 62 60-140 <br /> Surrogate 1 2-DCA-d4 218 250 87 60-140 <br /> Wow Analytical - Sacramento Tire 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 weighr basis <br /> This analvttcal report must be reproduced in its entirety <br /> Page 22 of 24 <br />