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819 Striker Avenue Suite 8 <br /> Sequoia nto CA 9543-U <br /> (9 6 )921--9600 <br /> FAX(916)9ZI-0100 <br /> Analytical www sequotalabs cOm <br /> Ctettler-Ryan-Dublin Project Unocal 2859 Stockton CA <br /> 6747 Sierra Court Ste J Project Number NIA Reported <br /> Dublin CA 94568 Project Manager S Polston 07/03/01 16 34 <br /> Total Purgeable Hydrocarbons (C6-C12), BTEX and MTBE by DHS LUFT <br /> Sequoia Analytical - Walnut Creek <br /> Reporting <br /> Analyte Result Llmlt Units Dilution Batch Prepared Analyzed Method Notes <br /> VE-1 @ 1605(5106303-01)Air Sampled 06/18/01 16 05 Received 06/19/01 12 02 <br /> Purgeable Hydrocarbons 78 10 mgfm'Air 02 IF15003 06/20/01 06/20/01 DHS LUFT P-02 <br /> Benzene 045 0 10 CC-3 <br /> Toluene 0 74 0 l0 " <br /> Ethylbenzene 0 70 0 l0 " <br /> Xylenes(total) 12 0 10 " <br /> Methyl tert-butyl ether ND 0 50 <br /> Surrogate a a a-Trtfluorotoluene 135% 70-130 S-04 <br /> VE-3 @ 737(5106303-02)Air Sampled 06/19/01 07 37 Received 06/19/01 12 02 <br /> Purgeable Hydrocarbons ND 10 mgfm'Air 02 1F15003 06/20/01 06/20/01 DHS LUFT <br /> Benzene ND 010 " <br /> tluene ND 010 " <br /> ylbenzene ND 010 <br /> Xylenes(total) 0 22 0 10 <br /> Methyl tert-butyl ether ND 0 50 " <br /> Surrogate a a a-Trtfluorotoluene 877% 70-130 " <br /> Effluent(S106303-03)Air Sampled 06/19/01 10 50 Received 06/19/0112 02 <br /> Purgeable Hydrocarbons ND 10 mg/ml Air 02 1F15003 06120/01 06/20/01 DHS LUFT <br /> Benzene ND 010 <br /> Toluene ND 010 " <br /> Ethylbenzene ND 010 " <br /> Xylenes(total) 022 0 10 " <br /> Methyl tent-butyl ether ND 0 50 " <br /> Surrogate a a a-Triflucrotoluene 870% 70-130 " <br /> 49 <br /> Sequoia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced to its entirety <br /> Page 2 of 8 <br />