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_ 819 Striker Ave Ste 8 a_ _� Sequoia Sacramento,CA 95834 (916)921-9600 iqWAnalytical FAX(916)921-0100 www.sequoialabs.com i Gettler-Ryan-Dublin Project: Former Unocal 0187, Stockton,CA S309067 6747 Sierra Court,Ste.3 Project Number: NIA Reported: Dublin CA,94568 Project Manager: Deanna L.Harding 09/15/03 16:39 Gasoline (2-Methylpentane to 1,2,4-Trimethylbenzene) and BTEX by EPA 8015M and 8021B Sequoia Analytical - Sacramento Reporting Analyte Result Limit Units Dilution Batch Prepared Analysed Method Notes U-3(5309067-04)Water Sampled:0812910313:00 Received:0910210316:20 Purgeable Hydrocarbons 350 50 ug/1 1 3090052 09/04/03 09/04/03 EPA 8021B Benzene 4.3 0.50 " IF Toluene 2.0 0.50 IF " Ethylbenzene 2.4 0.50 Xylenes(total) 2.6 0.50 Methyl tert-butyl ether ND 2.0 IF " Surrogate:a,a,a-Trifluorotoluene 95% 60-140 IF OF " U-4(S309067-05)Water Sampled:08/29/03 11:20 Received:09/02/03 16:20 Purgeable Hydrocarbons ND 50 ugR 1 3090052 09/04/03 09/04/03 EPA 80218 Benzene ND 0.50 1. " " Toluene ND 0.50 IF 1. " Ethylbenzene ND 0.50 IF " Xylenes(total) ND 0.50 " Methyl tent.butyl ether ND 2.0 Surrogate:a,a,a-Trifluorotoluene 89% 60-140 " " " IF U-5(5309067-06)Water Sampled. 08/29/03 10:50 Received:09/02/03 16:20 Purgeable Hydrocarbons ND 50 ug/l 1 3090052 09/04/03 09/04/03 EPA 80218 Benzene ND 0.50 1. " Toluene ND 0.50 " Ethylbenzene ND 0.50 " Xylenes(total) ND 0.50 " " Methyl tert-butyl ether ND 2.0 11 " Surrogate:a,a,a-Trifluorotoluene 83% 60-140 " " IF " Sequoia Analytical- Sacramento The results in this report apply to the samples analy2ed in accordance with the chain of . custody document. Unless otherwise stated, results are reported on a wet weight basis. This analytical report must be reproduced in its entirety. Page 5 of 29