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Sequoia 819 Striker Ave Ste 8 <br /> Sacramento,CA 95634 <br /> i (916)921-9600 <br /> Analytical FAX(916)921-0100 <br /> www sequoiaiabs.com <br /> -. er-R an-Petaluma Project: Tosco 11195 Lathrop,Y j P,CA 5212401 <br /> 1364 N McDowell Blvd,Ste B2 Project Number: N/A Reported: <br /> Petaluma CA, 94954 Project Manager: Jed Douglas 12/31/02 12:52 <br /> GasolinelBTEX\Oxygenates by EPA method 8260B- Quality Control <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result °/nREC Limits RPD Limit Notes <br /> 'Batch 2120307-EPA 5030E (P/Tl <br /> Blank(2120307-BLK1) Prepared&Analyzed: 12/18/02 <br /> Benzene ND 0.0050 mg/kg <br /> Toluene ND 0.0050 " <br /> Ethylbenzene ND 0.0050 " <br /> Xylenes(total) ND 0.010 " <br /> Methyl tert-butyl ether ND 0.0050 " <br /> Gasoline(C6-C 10). ND 1.0 " <br /> Surrogate:1,2-DCA-d4 0.0410 0;0500 82 60-140 <br /> Surrogate:Toluene-d8 0.0542 0.0500 108 60-140 <br /> Surrogate:4-BFB 0.0464 0.0500 93 60-140 <br /> Laboratory Control Sample(2120307-BSI) Prepared&Analyzed: 12/18/02 <br /> he 0.0204 0.0050 mg/kg 0.0272 75 70-130 <br /> Toluene 0.164 0.0050 0.167 98 70-130 <br /> Methyl tert-butyl ether 0.0322 0.0050 0.0448 72 60-140 <br /> Gasoline(C6-C10) 2.11 1.0 2.20 96 70-I30 <br /> Surrogate:1.2-DCA-d4 0.0410 0.0500 82 60-140 <br /> Surrogate:Toluene-d8 0.0550 0.0500 110 60-140 <br /> Surrogate:4-BFB 0.0485 0.0500 97 60-140 <br /> Matrix Spike(21.20307-MSI) Source:5212401-04 Prepared: 12/18/02 Analyzed: 12/19/02 <br /> Benzene 0.0197 0.0050 mg/kg 0.0272 ND 72 60-140 <br /> Toluene 0.161 0.0050 0.167 ND 96 60-140 <br /> Methyl tert-butyl ether 0.0318 0.0050 0.0448 ND 71 60-140 <br /> Gasoline(C6-C 10) 2.05 1.0 2.20 ND 93 60-140 <br /> Surrogate:1,2-DCA-d4 0.0391 0.0500 78 60-140 <br /> Surrogate:Toluene-d8 0.0572 0.0500 114 .60440 <br /> Surrogate:4-BFB 0.0493 0.0500 99 60-140 <br /> ,doia Analytical -Sac-rarnent0 The resins in this report apply to the samples analyzed in accordance with the Chain of <br /> custody docunrent. Unless otherwise stated,results are reported on a vvet weight basis. <br /> This analytical repol-1 must be reproduced in its entirety. <br /> Page 5 of 7 <br />