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819 Striker Avenue Suite 8 <br /> S e qu o l a Sacrarnento CA 95834 <br /> (916)921-9604 <br /> Analytical FAX(916)921-0100 <br /> www sequoialabs corn <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 P LeChemmant 03/14/01 15 29 <br /> Total Purgeable Hydrocarbons (C&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(5103110-01)Water Sampled 03/07/0109 15 Received 03/07/01 11 20 <br /> Purgeable Hydrocarbons 1530 500 ug/l 10 1030041 03/09/01 03/09/01 DHS LUFT P-03 <br /> Benzene 608 500 <br /> Toluene ND 500 <br /> Ethylbenzene 428 500 <br /> Xylenes(total) 129 500 " <br /> Methyl tert-butyl ether ND 25 0 <br /> Surrogate a a a-Trifluorotoluene 60 7% 60-140 " <br /> NP-1-65(S103110-02)Water Sampled 03/07/0109 10 Received 03/07/01 11. 20 <br /> Purgeable Hydrocarbons ND 500 ug/I 1 1030124 03/12/01 03/12/01 DHS LUFT <br /> Benzene ND 0 500 <br /> Toluene 0 632 0 500 " <br /> Aftibenzene ND 0 500 <br /> enes(total) ND 0 500 <br /> Methyl tert-butyl ether _ ND 250 " <br /> Surrogate a a a-Trtfluorotoluene 690% 60-140 " <br /> NP-1-11 l (S103110-03)Water Sampled 03/07/01 09 00 Received 03/07/01 11 20 <br /> Purgeable Hydrocarbons ND 500 ug/l 1 1030041 03109/01 03/09/01 DHS LUFT <br /> Benzene ND 0 500 <br /> Toluene ND 0 500 " <br /> Ethylbenzene ND 0 500 <br /> Xylenes(total) ND 0 500 <br /> Methyl tent-butyl ether ND 250 " <br /> Surrogate a a a-Trtflucrotoluene 698% 60-140 <br /> --Sequoia Analytical - Sacramento The results In this report apply to the samples analyzed to accordance with the chain of <br /> custody document This analytical report must be reproduced to its entirety <br /> page 2 of 6 <br />