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1�& sequoia 1551IndustrialRoad San Carlos CA 94070 Analytical (650)232-9600 FAX{650}232-96E2 www sequoialabs com ler-Ryan/Geostrategies(I) Project Unocal(4) Fb47 Sierra Court,Suite J Project Number Former Unocal#5098, Stockton Reported lin CA,94568 Project Manager Deanna Harding 07/01/02 07 46 Total Purgeable Hydrocarbons by DHS LUFT Sequoia Analytical - Sacramento Reporting k1alyle Result Limit Units Dilution Batch Prepared Analyzed Method Notes JJ�Y-SD L206021-09 Water Sampled 06/10/02 17 25 Received 06/I 1/02 18 05 rgeable Hydrocarbons 2100 500 ug/l 10 2060232 06/18/02 06/18/02 DHS LUFT Surrogate a,a,a-Triuorotaluene 98% 60-140 -9 L206021-10 Water Sampled 06/10/020956 Received 06/11/02 IS 05 Illrgeable Hydrocarbons 63 50 ug/l 1 2060220 06/17/02 06/18/02 DHS LUFT Surrogate a,a,a-Triuorotoluene 85 % 60-140 IF l0 L206021-11 Water Sampled 06/10/02 11 35 Received 06/11/02 1S 05 urgeable Hydrocarbons ND 50 ug/1 1 2060220 06/17/02 06/18/02 DHS LUFT rogate a,a,a-Triuorotoluene 83% 60-140 ' -10A L206021-I2 Water Sampled 06/10/02 I2 00 Received 06/11/02 18 05 Purgeable Hydrocarbons ND 50 ug/l 1 2060220 06/17/02 06/18/02 DHS LUFT rogate a,a,a-Trtfluorotoluene 79% 60-140 IF „ V-1I L206021-I3 Water Sam led 06/11/02 10 55 Received 06/11/02 IS 05 Purgeable Hydrocarbons 37000 5000 ug/l 100 2060232 06/18/02 06/19/02 DHS LUFT to a,a,a-Trifluorotoluene 101 % 60-140 „ - 2 L206021-14 Water Sampled 06/11/02 12 10 Received 06/11/02 IS 05 P geable Hydrocarbons 2300 1000 ug/l 20 2060232 06/18/02 06/18/02 DHS LUFT ogate a,a,a-Triuorotoluene 93% 60-140 „ VIVO'-13 L206021-15 Water Sampled 06/10/02 10 50 Received 06/11/02 18 05 eable Hydrocarbons ND 50 ug/1 1 2060232 06/18/02 06/18/02 DHS LUFT -ogate a a a-Trtfluorotoluene 93 % 60-140 saoia Analytical- San Carlos The results in this report apply to the samples analyzed to accordance with the chain ha n of custody document This aturfytrcal report must be reproduced in its entirety Page 77 of 103