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819 Striker Ave Ste 8 <br /> Sacramento,CA 95834 <br /> a— —) Sequoia (916)921-9600 <br /> Analytical FAX equo labs.c2 1 00 <br /> wwwsequoiaSabs.com <br /> ==settler-Ryan-Petaluma Project: Tosco 11195,Lathrop,CA 5304543 <br /> 1364 N McDowell Blvd.Ste B2 Project Number: NIA Reported. <br /> Petaluma CA,94954 Project Manager: Dave Vossler 05/06/03 17:59 <br /> GasolinelBTEMOxygenates by EPA method 8260B <br /> Sequoia Analytical- Sacramento <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-3 5304543-01)Water Sampled: 04/22/0311:31 Received:04/22/0315:33 <br /> Benzene ND 2.5 ugll 5 3050017 05/01/03 05/02/03 EPA 8260B <br /> Toluene ND 25 <br /> Ethyibenzene ND 2,5 <br /> Xylenes(total) ND 2.5 " <br /> Gasoline(C6-CIO) 6700 250 RC-19 <br /> Surrogate:1,2-DCA-d4 110% 60-140 " <br /> Surrogate: Toluene-d8 103% 60-140 " <br /> Surrogate:4-BFB 80% 60-140 " <br /> MR'-3 S304543-OIREl Water Sampled:04/2210311:31 Received:04122/0315:33 <br /> Methyl tert-butyl ether 4400 25 ugll 5o 3050030 05102/03 05/02/03 EPA 8260B <br /> Surrogate:1,2-DCA-d4 114% 60-140 <br /> Surrogate:Tohrene-d8 102% 60-140 " <br /> Surrogate:4-BFB 74% 60-140 " <br /> W-10(5304543-02)Water Sampled:04/22/03 11:51 Received:04/22/03 15:33 <br /> = nzene ND 0.50 ug/l 1 3050017 05/01/03 05/02/03 EPA 8260B <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-DC,4-d4 112% 60-140 " <br /> Surrogate: Tohrene-d8 105% 60440 " <br /> Surrogate:4-)?FB 75% 60-140 <br /> Sequoia Analytical-Sacramento The results in this report apply to the samples analyzed to accordance with the chain of <br /> r ..i 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 3 of 7 <br />