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r r. 404 N Wlget Lane Sequoia Walnut Creek cA 945% 88-V" 4 (925)988-9600 FAX(925)988-9673 a- ) Analytical www sequolalabs com nc -Dublin Project Tosco 6747 Sierra Court Suite 1 Project Number Tosco 9 6981 Reported Dublin CA,94568 Project Manager Scott Polston 05-Sep-Ol 18 11 Total Purgeable Hydrocarbons (C&C12) and BTEX in Air by DHS LUFT Sequoia Analytical -Walnut Creek Reporting Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes 6981-EFF(W108418-01)Air Sampled 23-Aug-01 09 09 Received 23-Aug-01 11 03 Purgeable Hydrocarbons(C6-C 12) ND 20 mg/0 Air 02 11421003 23-Aug-01 23-Aug-01 DHS LUFT Benzene ND 0 010 " Toluene ND 0 010 " Ethylbenzene ND 0 010 " Xylenes(total) ND 0 010 " Surrogate a,a,a-Triffuorotoluene 953% 70-130 " 6981-INF(W108418-02)Air Sampled 23-Aug-0109 23 Received-23-Aug-01 11.03 Purgeable Hydrocarbons(C6-C12) ND 28 ppmv 1 IH21003 23-Aug-01 23-Aug-01 DHS LUFT Benzene ND 0 016 " 11 " Toluene ND 0 013 It " Ethylbenzene ND 0 012 It " " Xylenes(total) ND 0 012 " " " " " " Methyl tert-butyl ether(MTBE) ND 014 " {W108418-03)Air Sampled 23-Aug-41 08 49 Received 23-Aug-01 1103 able Hydrocarbons(C6-C 12) ND 28 ppmv 1 11321003 23-Aug-01 23-Aug-01 DHS LUFT Benzene ND 0 016 11 " " " Toluene ND 0 013 It It " Ethylbenzene ND 0 012 H It " Xylenes(total) ND 0 012 Methyl tert-butyl ether(MTBE) ND 014 " Ve-3(W 108418-04)Air Sampled 23-Aug-01 08 51 Received 23-Aug-01 11 03 Purgeable Hydrocarbons(C6-C l2) ND 28 ppmv 1 1 H21003 23-Aug-01 23-Aug-01 DHS LUFT Benzene ND 0 016 " " " " " " Toluene ND 0 013 Ethylbenzene ND 0 012 " Xylenes(total) ND 0 012 " Methyl tert-butyl ether(MTBE) ND 014 " Sequoia Analytical-Walnut Creels 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 Page 5 of 12