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a— —) 819 Striker Ave Sle 8 <br /> Sequoia Seccam(9n'o6,)919593496000► Analytical FAX(916)921-0100 <br /> www.sequoinlabs.com <br /> Gettlor-Ryan-Petaluma Project: Tosco 11195,Lathrop,CA S303557 <br /> 1364 N McDowell Blvd.Ste B2 Project Number: N/A Reported: <br /> Petaluma CA,94954 Project Manager: Dave Vossler 04/04/03 18:44 <br /> GasolinelBTEXIOxygenates by EPA method 8260B -Quality Control <br /> Sequoia Analytical.- Sacramento <br /> Reporting Spike Source %RFC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3040041-EPA 5030B PIT] <br /> Blank(3040041-BLK1) Prepared&Analyzed:04/02/03 <br /> Benzene ND 0.50 ug/l <br /> Toluene ND 0.50 " <br /> Ethylbenzene ND 0.50 " <br /> Xylenes(total) ND 0.50 " <br /> Methyl tert-butyl ether ND 0.50 " <br /> Gasoline(C6-C10) ND 50 " <br /> Surrogate: 1,2-DCA-d4 25.7 25.0 103 60-140 <br /> Surrogate:Toluene-d8 25.1 25-0 100 60-140 <br /> Surrogate:4-BFB 23-8 15,0 95 60-140 <br /> Blank(3040041-BLK2) Prepared&Analyzed:04/03/03 <br /> Benzene ND 0.50 ugll <br /> Toluene ND 0.50 ?f <br /> Etbylbenzene ND 0,50 2 <br /> Xylenes(total) ND 0.50 " <br /> Methyl tert-butyl ether ND 0.50 " <br /> Gasoline(C6-C10) ND 50 " <br /> Surrogate:1,2-DCA-d4 29.4 25.0 118 60-140 <br /> Surrogate: Toluene-d8 24.7 25.0 99 60-140 <br /> Surrogate:4-BFB 24-2 25.0 97 60-140 <br /> BIank(3040041-BLK3) Prepared&Analyzed:04/04/03 <br /> Benzene ND 0-50 ug/l <br /> Toluene ND 0.50 " <br /> Ethylbenzene ND 0.50 " <br /> Xylenes(total) ND 0.50 " <br /> Methyl tert-butyl ether ND 0,50 " <br /> Gasoline(C6-C10) ND 50 }} <br /> i <br /> Surrogate:1,2-DCA-d4 30.3 25.0 121 60-140 4 <br /> Surrogate:Toluene-d8 25.2 25.0 101 60-140 <br /> Surrogate:4-BFB 24.7 " 25-0 99 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. 3 <br /> Page 4 of 7 <br /> fLF <br /> f <br />