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S 19 Sinker Ave Ste 8 <br /> Sequoia Sacramento CA 95834 <br /> a— —) <br /> 4 <br /> (916)921-9600 <br /> AW Analytical FAX(916)921-0]OD <br /> www sequotalabs com <br /> ettler-Ryan-Petaluma Project Tosco 11192,Stockton,CA 5212209 <br /> 1364 N McDowell Blvd Ste B2 Project Number N/A Reported <br /> Petaluma CA,94954 Project Manager Dave Vossler 12/31/02 11 16 <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 2120184-EPA 5030B [PIT] <br /> Blank(2120184-BLK1) Prepared 12/13/02 Analyzed 12/14/02 <br /> Tert-butyl alcohol ND 0 050 mg/kg <br /> Methyl tert-butyl ether ND 00050 " <br /> Di-isopropyl ether ND 00050 " <br /> Ethyl tert-butyl ether ND 00050 <br /> Tert amyl methyl ether ND 00050 " <br /> Ethanol ND 0 20 " <br /> 1,2-Dtehloroethane ND 00050 <br /> 1,2-Dibromoethane(EDB) ND 00050 " <br /> Surrogate 1 1-DCA-d4 00483 00500 97 60-140 <br /> Blank(2120184-BLK2) Prepared&Analyzed 12/16/02 <br /> Wt-butyl <br /> alcohol ND 0 050 mg/kg <br /> hyl tert butyl ether ND 00050 " <br /> Di-isopropyl ether ND 00050 " <br /> Ethyl tert butyl ether ND 00050 " <br /> Tert-amyl methyl ether ND 00050 " <br /> Ethanol ND 0 20 " <br /> 1 2-Dichloroethane ND 00050 " <br /> 1,2-Dibromoethane(EDB) ND 00050 " <br /> Surrogate 12-DCA-d4 00431 00500 86 60-140 <br /> Laboratory Control Sample(2120184-BSI) Prepared 12/13/02 Analyzed 12/14/02 <br /> Methyl tert-butyl ether 00500 00050 mg/kg 00500 100 60-140 <br /> Surrogate 11-DCA-d4 00481 00500 96 60-140 <br /> Laboratory Control Sample(2120184-BS2) Prepared 12/12/02 Analyzed 12/14/02 <br /> Methyl tert-butyl ether 00399 00050 mg/kg 00449 69 60-140 <br /> Surrogate 11-DCA-d4 00480 00500 96 60-140 <br /> quota 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 9 of 13 <br />