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Gettler-Ryan/Geostrategies(1) Project Tosco(1) 6747 Sierra Court,Suite 3 Project Number Tosco(Unocal)SS#6981 Repo rted Dublin CA,94568 Project Manager Deanna Harding 03/22/01 13 29 Total Purgeable Hydrocarbons (C6-C12), BTEX and MTBE by DHS LUFT- Quality Control Sequoia Analytical- San Carlos Reporting Spike source %REC RPD Analytc Result Limit Units Level Result %REC lamas RPD Limit Notes Batch 1030047-EPA 5030B(PIT) Blank(1030047-BLK1) Prepared&Analyzed 03/14/01 Purgeable Hydrocarbons as Gasohne ND Soo 119/1 Benzene ND 0 500 " Toluene ND 0 500 " Ethylbeazene ND 0 500 " Xylenes(total) ND 0 500 " Methyl tert-butyl ether ND 500 " Surrogate a aa-7"hfluorotoluene 823 100 823 70-130 LCS(1030047-BSI) Prepared&Analyzed 03/14/01 BenZene 846 0 500 u9/1 100 84 6 70-130 T� 855 0 500 10 0 855 70-130 g 877 0 500 100 87 7 70-130 Xylenes(total) 26 9 0 500 300 897 70-130 Surrogate a a,a-Thfluorotoluene 919 100 919 70-130 LCS(1030047-BS2) Prepared&Analyzed 03/14/01 Purgeable Hydrocarbons as Gasohne 293 500 ugll 250 117 70-130 Surrogate a a a-Trifluorotoluene 106 0100 106 70-130 Matrix Spike(1030047-MSI) Source.L103047-06 Prepared&Analyzed 03/14/01 Benzene 907 0 500 ug/I 100 ND 907 60-140 Toluene 901 0 500 100 ND 901 60-140 Ethylbenzene 9 13 0 500 100 ND 913 60-140 Xylenes(total) 275 0 500 300 ND 917 60-140 Surrogate a,a,a-Trifluorotoluene 101 100 101 70-130 Matrix Spike Du (1030047-MSDI) Source L103047-06 Prepared&Analyzed 03/14/01 Benzene 895 0 500 ug/1 100 ND 885 60-140 246 25 Toluene 876 0 500 100 ND 87 6 60-140 281 25 Ethylbenzene 880 0 500 100 ND 880 60-140 3 68 25 Xylenes(total) 26 8 0 500 " 300 ND 893 60-140 258 25 Surrogate a,a,a-Tnfluorotoluene 104 100 104 70-130 Sequoia Analytical-San Carlos The results in this report apply to the samples anal)ced in accordance with the chain of custody document Thu analytical report must be reproduced in its entirety Page 14 of 25