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819 Striker Avenue Suite 8 <br /> Sequoia Sacramento CA 95834 <br /> (916)921-9600 <br /> Analytical <br /> FAX equoalabsc00 <br /> www sequoialabs com <br /> Gettler-Ryan-Dublin Project Unocal 0187, Stockton, CA <br /> 6747 Sierra Court,Ste J Project Number C-Sparge Test Reported <br /> Dublin CA,94568 Project Manager Paul LeCheminant 07/20/01 11 20 <br /> Total Purgeable Hydrocarbons (C6-C12), BTEX and MTBE by DHS LUFT <br /> Sequoia Analytical - Sacramento <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> NP-1-22(5107029-01)Water Sampled 07/03/01 10 50 Received 07/03/01 16 20 <br /> Purgeable Hydrocarbons 5900 5000 ug/l 100 1070171 07/16/01 07/16/01 DHS LUFT <br /> Benzene 210 50 " <br /> Toluene ND 50 " <br /> Ethylbenzene 280 50 " <br /> Xylenes(total) 790 50 " <br /> Methyl tert-butyl ether ND 250 " <br /> Surrogate a a a-Trifluorotoluene 886% 60-140 " <br /> NP-1-65(5107029-02)Water Sampled 07/03/01 10 30 Received 07/03/01 16 20 <br /> Purgeable Hydrocarbons 960 500 ug/l 10 1070171 07/16/01 07/16/01 DHS LUFT <br /> Benzene 49 50 " <br /> Toluene 270 500 " <br /> (benzene 28 5 0 <br /> nes(total) 180 5 0 <br /> Methyl tert-butyl ether ND 25 " <br /> Surrogate a a a-Trifluarotoluene 124% 60-140 " <br /> NP-1-111 (5107029-03)Water Sampled 07/03/01 10 15 Received 07/03/01 16 20 <br /> Purgeable Hydrocarbons ND 50 ug/l 1 1070171 07/16/01 07/16/01 DHS LUFT <br /> Benzene ND 050 " <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 0 50 " <br /> Methyl tert-butyl ether ND 25 " <br /> Surrogate a,a a-Trifluorotoluene 124% 60-140'11111014 " <br /> nota Analytical- Sacramento The results to this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 2 of 5 <br />