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819 Striker Avenue Suite 8 <br /> Sequoia Sacramento CA 95834 <br /> (916)921-9600 <br /> FAX <br /> Analytical www sequotalabscoin <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 05/01/01 15 19 <br /> Total Purgeable Hydrocarbons (C6-C12), BTEX and MTBE by DHS LUFT <br /> Sequoia Analytical - Sacramento <br /> Reporting <br /> Analyte Result Limn Units Dilution Batch Prepared Analyzed Method Notes <br /> NP-1-22(5104327-01)Water Sampled 04124/0109 10 Received 04/24/01 11 00 <br /> Purgeable Hydrocarbons 5810 5000 ugll 100 1040327 04/26/01 04/26/01 DHS LUFT P-02 <br /> Benzene 123 500 " <br /> Toluene ND 500 " <br /> Ethylbenzene 230 500 " <br /> Xylenes(total) 533 500 " <br /> Methyl tert-butyl ether ND 250 " <br /> Surrogate a a a-Trrfluorotoluene 906% 60-140 <br /> NP-1-65(S104327-02)Water Sampled 04/2410108 55 Received 04/24/01 11 00 <br /> Purgeable Hydrocarbons 109 100 ug/l 2 1040329 04/26/01 04/26/01 DHS LUFT P-02 <br /> Benzene 419 100 " <br /> Toluene 179 100 " <br /> ylbenzene 142 100 " <br /> enes(total) 224 1 00 <br /> Methyl tert-butyl ether ND 500 " <br /> Surrogate a,a a-Trifluorotoluene 103% 60-140 " <br /> NP-1-111 (5104327-03)Water Sampled 04/2410108 45 Received 04/24/01 11 00 <br /> Purgeable Hydrocarbons ND 500 ug/I 1 1050007 04/30/01 04/30/01 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 tert-butyl ether ND 250 " <br /> Surrogate a a a-Trifluorotoluene 991 % 60-140'qW " <br /> quota 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 2 of 7 <br />