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1551 Indusinal Road Sequoia San Carlos CA 94070 a_ _� Analytical FAx(650)232 9600 (650)232.9612 www mquo'alabs com Genler-Ryan/Geostrategies(1) Project Unocal(4) 6747 Sierra Court,Suite J Project Number Unocal SS4#5098, Stockton CA Reported Dublin CA 94568 Project Manager Deanna Harding 01/01/02 11 05 - - - _ Total Purgeable Hydrocarbons by DHS LUFT _ - _ Sequoia Analytical - San Carlos Reporting Analvie Result Limit Units Dilution Batcb Prepared Analyzed Method Notes MW-18D(L)12030-22)Water Sampled 12/03/01_]2 50 Received 12/04/01 17 50 Purgeable Hydrocarbons as Gasoline ND 50- ug/[_ I - 1120050 - 12/12/01 12/12/01_ ,EPA 80]SM--- _ Surrogate a,a a-Trifluorololuene 772% 60-140 " MW-19S(L112030-23)Water Sampled 12/04/010933 Received 12/04/01 17 50 Purgeable Hvdrocarbons as Gasoline ND 50 u&A 1 1120050 12/12/01 12/12/01 EPA 80ISM Surrogate a,a,a-Triuorotoluene 722% 60-140 " MW-19D L112030-24 Water Sampled 12/04/01 11 55 Received 12/04/01 17 50 Purgeable Hydrocarbons as Gasoline 1500 250 ug/l 5 1120050 12/12/01 12/13/01 EPA 8015M P-01 Surrogate a,a,a-Trifluorotoluene 974% 60-140 " MW-21S(1,112030-25)Water Sampled 12103/010720 Received 12/04/01 17 50 Purgeable Hydrocarbons as Gasoline ND 50 ug/1 1 1120050 12/12/01 12/12/01 EPA 8015M Surrogate a,a,a-Trefluorotoluene 78 7% 60-140 I%IW-21D(1,112030-26)Water Sampled 12/03/0107 53 -Received 12/04/01 17 50 - Purgeable Hydrocarbons as Gasoline ND 50 ug/l 1 1120049 12/12/01 12/12/01 EPA 8015M Surrogate a,a,a-Triuorotoluene 919% 60-140 " MW-22S(1,)12030-27)Water Sampled 12/03/01 08 13 Received 12/04/01 17 50 Purgeable Hydrocarbons as Gasoline ND 50 ug/1 1 1120049 12/12/01 12/12/01 EPA 8015M Surrogate a qa-Trifluoroioluene 87 3% - MW-22D(L]12030-28)Water Sampled 12/03/0109 15--Received 12/04101-17 50- -- Purgeable Hydrocarbons as Gasoline 480 50 ug/I 1 1120050 12/12/01 12/12/01 EPA 8015M P-03 Surrogate a,a,a-Trfluorotoluene -152-% 60-140 v S-04 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 enurety Page 6 of 34