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Sequoia 155] Industria]Road San Carlos C' 94070 Analytical4i) (65 0)232 9600 FAX(650)232 9612 www sequolalabs com Gettler-Ryan/Geostrategies(1) Prosect Unocal(4) 6747 Sierra Court, Suite J Project Number Former Unocal#5098&Montgmery Ward Reported Dublin CA, 94568 Project Manager Deanna Harding 03/26/02 12 44 Tentatively Identified Compounds by GC/MS Sequoia Analytical - San Carlos y Reporting Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes MW-18D L203015-22 Water Sampled 03/04/02 10 43 Received 03/05/02 18 25 No TLCs found ND 10 ugA 1 2030017 03/08/02 03/08/02 EPA 8260B MW-195 L203015-23 Water Sampled 03/04/02 11 10 Received 03/05/0218 25 = No TICS found ND 10 ugA 1 2030017 03/08/02 03/08/02 EPA 8260B AIW-19D L203015-24 Water Sampled 03/04/02 14 30 Received 03/05/02 18 25 2-Butanone 1800 5 0 ug/I 5 2030023 03/14/02 03/14/02 EPA 8260B Dimethyl Butane 6 2 5 D Ethyl Cyclopropane 7 0 5 0 Methyl Propenyl Benzene 18 5 0 „ Propenyl benzene 24 50 „ Tetrahydrofuran 280 50 MW-215 1-203015-25 Water Sampled 03/03/02 12 45 Received 03/05/02 18 25 No TICS found' ND 10 ug/l 1 2030017 03/08/02 03/12/02 EPA 8260B i MW-211)(1-203015-26)Water Sampled 03/03/02 14 55 Received 03/05/02 18 25 No TICS found ND 10 ug/1 1 2030017 03/08/02 03/08/02 EPA 8260B AIW-225 L203015-27 Water Sampled 03/03/02 13 20 Received 03/05/02 18 25 No TICS found ND 10 ug/1 1 2030017 03/08/02 03/12/02 EPA 9260B MW-22D(L203015-2$)Water Sampled 03/03/02 16 20 Recened 03/05/02 18 25 Dimethyl Butane 44 ] 0_ug/l 1 2030017-03/08/0203/13/02= EPA 8260B Dimethyl Heptane 55 10 - Dimethyl Pentane 33 10 Methyl Pentane- ----- - - ---8 3 ---1 0 -- Tetramethyl Butane- ---- - - --- _-951 0 -="-- ---- -- - - _„_ - --- „ --- Trimethyl pentane 45 10 Sequoia Analytical - San Carlos The i esults in thus report apply to the samples analyzed to accordance with the chain of custody document This analytical report must he reproduced in its entirety ' Page 13 of 91 ,