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819 Striker Avenue Suite 8 <br /> Sequoia Sacramento CA 95834 <br /> (916)92-1-9600 <br /> FAR` <br /> Analytical www sequoiala °0100labs corn <br /> Gettler-Ryan-Dublin Project Unocal 0187, Stockton CA <br /> 6747 Sierra Court,Ste J Protect 1*iumber C-Sparge Test <br /> Reported <br /> Dublin CA,94568 Project Manager Paul LeCheminant 04/16/01 11 55 <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(5104132-04)Water Sampled 04/10/01 11 20 Received 04/10/01 15 00 <br /> Purgeable Hydrocarbons 409 250 ug/l 5 1040173 04/12/01 04/12/01 DHS LUFT P-02 <br /> Benzene 293 250 " <br /> Toluene ND 250 " <br /> Ethylbenzene 541 250 " <br /> Xylenes(total) 697 250 " <br /> Methyl tert-butyl ether 274 12 5 " <br /> Surrogate a a a-Trifluorotoluene 935% 60-140 " <br /> NP-2-60(S104132-05)Water Sampled 04/10/01 11 15 Recewed 04110/01 15 00 <br /> Purgeable Hydrocarbons 7570 5000 ug/l 100 1040173 04/12/01 04/12101 DHS LUFT P-02 <br /> Benzene 3150 Soo " <br /> Toluene ND 500 " <br /> 0ylbenzene 174 500 " <br /> enes(total) 312 50 0 <br /> Methyl tert-butyl ether 592 250 " <br /> Surrogate a a a-Trtfluorotoluene 914% 60-140 " <br /> NP-2-116(S104132-06)Water Sampled 04/10/01 11 05 Received 04/10/01 15 00 <br /> Purgeable Hydrocarbons 761 50 0 ug/l 1 1040173 04/12/01 04/12/01 DHS LUFT P-02 <br /> Benzene 258 0 500 " <br /> Toluene ND 0 500 " <br /> Ethylbenzene 129 0 500 " <br /> Xylenes(total) 176 0 500 " <br /> Methyl tert-butyl ether 3 74 250 " <br /> Surrogate a a a-Trifluorotoluene 103% 60-140 " <br /> —'Sequoia Analytical- Sacramento The results in this report apply to the samples analyzed rn accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 3 of 6 <br />