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1551 In dusm al Road Sequoia San Carlos CA 94070 �► Analytical (650)2329600 FAX(650)232.8612 www sequoialabs com Gettler-Ryan/Geostrateg ies(1) Project Unocal(4) 6747 Sierra Court, Suite 7 Project Number Former Unocal#5098,Stockton Reported Dublin CA,94568 Project Manager Deanna Harding - 07/Q1/02 07 46 Tentatively Identified Compounds by GC/MS Sequoia Analytical - San Carlos Reporting �S Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes N W-21D(1,206021-26)Water Sampled 06/09/02 12 40_ Received 06/11/02 l8 05 No_TICs found ND - to ug/I 1 .- 2060032_ 06/20/02 06/20/02 EPA 8260B _s _ MW-22S(1,206021-27)Water Sampled 06/09/02 13 15 Received 06/1 1102 18 05 No TICS found ND I 0 ugll 1 2060032 06/20/02 06/20/02 EPA 8260B~ MW-22D(L206021-28)Water Samnpled_ 06/09/02 13 50 Received 06/11/02 18_0_5 _ �- Dimethyl butane 4 2 10 ug/I 1 2060032 06/20/02 06/20/02 EPA 8260E Dimethyl butane isomer 18 1 0 Dimethyl heptane 3 1 10 Dimethyl pentane 30 1 0 " ^ Dimethyl pentane isomer- 17 10 Methyl pentane 3 4 10 Tetramethyl_Butane57 10 Trimethyl heptane T 12 10 Trimethyl pentane 10 10 " Unknown _ - 24 10 " ^ MW-23S(L206021-29)Water Sampled 06/11/02 13 28 Received 06/11/02 18 05 2-Butanone 3900 25 ug/1 25 2060034 06/24/02 06/24/02 EPA 8260E Acetone 60 2 5 CjcloheAanone 1u` 2 5 Tetrohydrofuran 5700 2 5 MW-23D(L206021-30)Water Sampled 06/11/02 12 11 Received 06/11/02 18 05 ._-- -2=13utanone" --- - - 880 —2 5J-"ug/1='- - - -2 5�2060034�06/24/02-06124/02�EPA 8260E - - 2-Propanone 33 25 ^ " - - --- - - _ - -_-- - - = - Tetrandrofur•an - - - -- ---- -- 1800 -- 2-5- y _ � Sequoia 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 Page 8 of 103 r