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Sequoia an Industrial Road [ <br /> a— ) sat,Carlos cA 9ao7a <br /> (650)232-9612 <br /> Analytical <br /> FAX(650)232 9612 <br /> www sequoialabs com , <br /> Gettler-Ryan/Geostrategies(1) Project Tosco(1) <br /> 6747 Sterna Court,Suite J Project Number Unocal SS#08671 Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 05121/02 1326 <br /> , <br /> GasolineWEXIOxygenates by EPA method 8260B <br /> Sequoia Analytical - Sacramento- T <br /> Reporting <br /> ,analyte Result Limit Units Dilution Balch Prepared Analyzed Method Notes <br /> TB-LB L205023-01 Water Sampled 05/06/02 00 00 Received 05/06/02 17 05 <br /> Benzene ND 050 ug/l 1 2050122 05/15/02 05/16/02 EPA 82608 <br /> Toluene ND 050 <br /> Ethylbenzene —ND—0 50 " <br /> Xylenes(total) ND 050 <br /> Gasoline(C6-C10) ND 50 <br /> Surrogate 1,2-DCA-d4 96% 60-140 <br /> Surrogate Toluene-d8 92% 60-140 " <br /> Surrogate 4-BFB 79% 60-140 <br /> MW-1 (L205023-02)Water Sampled 05/06/02 14 45- Received 05/06/02 17 05 _ R-05 <br /> BenzeneT ND - 25 - ug/1 50 2050122 05/15/02 05/16/02 EPA 8260B <br /> Toluene ND 25 <br /> Ethylbenzene ND - 25 <br /> Xylenes(total) ND 25 <br /> Gasoline(C6-C10) 5700 2500 " <br /> Surrogate 1,2-DCA-d4 96% 60-140 <br /> Surrogate Toluene-d8 102% 60-140 <br /> Surrogate 4-BFB 106% 60-140 <br /> MW-2 (1.205023-03)Water Sampled 05/06/02 13 35 Received 05/06/02 17 05 <br /> Benzene 0 54 050 ug/I 1 2050109 05/10/02 05/11/02 EPA 9260B <br />=Toluene=_=— ND 0 50== — <br /> Ethylbenzene ND 050 <br /> "Xylenes(total)—T- _ ._ _�- - 1-7�- � --0 - <br /> Gasoline(C6-C10) 62 50 <br /> Surrogate 1,2-DCA-d4 -_-F - -� 105% 60-140 <br /> Surrogate Toluene-d8 99% 60-140 " <br /> Surrogate 4-BFB 107% 60-140 " <br /> Sequoia Analytical - San Carlos The i esults in this report apply to the samples analyzed in accordance with the chain <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 5 of 13 <br />