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Sequoia 819 acres Avenue Suite 8 <br /> Sacramento CA 95834 <br /> (916)921-9600 <br /> FAX(916)921-0 100 <br /> a_ _� Analytical 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 Paul LeChetninant 04/03/01 13 49 <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-2-20(5103485-04)Water Sampled 03127/0100 00 Received 03/27/01 13 30 <br /> Purgeable Hydrocarbons 346 500 ug/l 1 1040035 04/02/01 04/02/01 DHS LUFT P-04 <br /> Benzene 223 0 500 " <br /> Toluene ND 0 500 " <br /> Ethylbenzene 602 0 500 " <br /> Xylenes(total) 969 0 500 " <br /> Methyl tert-butyl ether 16 6 250 " <br /> Surrogate a a a-Trifluorotoluene 108% 60-140 <br /> NP-2-60(5103485-05)Water Sampled 03/27/0100 00 Received 03/27/01 13 30 <br /> Purgeable Hydrocarbons 7810 5000 ug/l 100 1040008 03/30/01 03/30/01 DHS LUFT P-04 <br /> Benzene 3280 500 " <br /> Toluene 241 500 " <br /> ylbenzene 207 500 <br /> enes(total) 348 500 <br /> Methyl tert-butyl ether 659 250 <br /> Surrogate a a a-Trac luorotoluene 909% 60-140 " <br /> NP-2-110(5103485-06)Water Sampled 03/27/01 00 00 Received 03/27/01 13 30 <br /> Purgeable Hydrocarbons 778 500 ug/l 1 1040008 03/30/01 03/30/01 DHS LUFT P-04 <br /> Benzene 243 0 500 <br /> Toluene 113 0 500 " <br /> Ethylbenzene 121 0 500 " <br /> Xylenes(total) 176 0 500 " <br /> Methyl tert-butyl ether 609 250 _ <br /> Surrogate a a a-Trifluorotoluene 868% 60-140 " <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 in its entirety <br /> Page 3 of 6 <br />