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Sequoi.a 1551 Industrial Road San Carlos CA 94070 Analytical (650)232-9600 FAX(650)232.9612 www.sequoiala6s.eom Gettler-Rvan/Geostrategies(0 Project: Tosco(1) .-.':."-:15747 Sierra Court,Suite J Project Number: Tosco#11195 Reported: Dublin CA,94568 Project Manager: Deanna Harding 02/21/02 08:17 Total Purgeable Hydrocarbons (C6-02), BTEX and MTBE by DHS LUFT Sequoia Analytical -Walnut Creek Reporting Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes MW-10(L202058-10)Water Sampled:02/07/02 11:05 Received:02/07/02 18.35 Purgeable Hydrocarbons(C6-C12) ND 50 ug/I I 2B18003 02/19/02 02/19/02 EPA 8015M/8021 Benzene ND 0.50 " +' Toluene ND 0.50 Ethylbenzene ND 0.50 " Xylenes(total) ND 0.50 Surrogate:a,a,a-Trifluorotoluene 104% 70-130 MW-1 0(L202058-1 ORE])Water Sampled:02/07/02 11:05 Received:02/07/02 18.35 Methyl tert-butyl ether(MTBE) 4000 250 uM 100 2B18003 02/20/02 02/20/02 EPA 8015M/8021 Surrogate:a.a,a-Trifluorotoluene 99% 70-130 MW-]1 (L202058-1])Water Sampled:02/07/02 13:35 Received:02/07/02 18:35 Purgeable Hydrocarbons(C6-C12) ND 50 ug/1 1 2B18003 02/19/02 -02/19102 EPA 8015M/8021 :r �zene ND 0.50 -.:iuene ND 0.50 " " " It Ethylbenzene ND 0.50 Xylenes(total) ND 0.50 It it Methyl tert-butyl ether(MTBE) 39 2.5 Surrogate:a,a,a-Trifluorotoluene 101% 70-130 MW-12(L202058-12)Water Sampled:02/07/02 12:58 Received:02/07/02 18:35 _ 1 Purgeable Hydrocarbons(C6-C12) ND 50 ug/I 1 2B18003 02/19/02 02/19/02 EPA E 8015M/8021 Benzene ND 0.50 " t Toluene ND 0.50 k Ethylbenzene ND 0.50 PP It + Xylenes(total) ND 0.50 Methyl tert-butyl ether(MTBE) ND 2.5 Surrogate:a,a,a-Trifluorololuene 100% 70-130 6 '..?ia Analytical -San Carlos The results in this report apply to the samples analyzed in accordance with the chain !- of custody document. This analytical report must be reproduced in its entirety. i� C Page 9 of 17 'E