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• Gettler-Ryan/Geostrategies(1) Project Tosco(1) 6747 Sierra Court,Suite 7 - Project Number Tosco(Unocal)SS#6981 Reported -Dublin CA,94568- - - _ _ _- Project Manager Deanna Harding - _ _ -_ _ 03/22/01 13 29 Total Purgeable Hydrocarbons (C6-C12), BTEX and MTBE by DSS LUFT - Quality Control Sequoia Analytical- San Carlos Reporting Spike Source %REC RPD Result Limit Umta_ Level Result %REC Limits RPD Limit Notes _Batch 1030048-EPA 5030B(PIT) Blank(1030048-BLK1) Prepared&Analyzed 03/14/01 Purgeable Hydrocarbons as Gasoline ND 500 119/1 Benzene ND 0 500 " Toluene ND 0 500 " Ethylbenzene ND 0 500 " Xylenes(total) ND 0 500 " Methyl teat-butyl ether ND 500 " Surrogate a,a,a-D7fluorotoluene 103 100 103 70-130 LCS(1030048-BS1) Prepared&Analyzed 03/14/01 Benzene 104 0 500 ug/l 100 104 70-130 Toluene 103 0 500 100 103 70-130 Ethylbenzene 105 0 500 100 105 70-130 Xylenes(total) 315 0 500 " 300 105 70-130 Surrogate aa a-Trifluorotoluene 112 100 112 70-130 LCS(1030048-BS2) Prepared&Analyzed 03/14/01 Purgeable Hydrocarbons as Gasoline 252 500 ug/1 250 101 70-130 Surrogate a a a-Tnfluorotoluene 120 100 120 70-130 Martz 5 ike(1030048-MSI) Source L103032-04 Prepared&Analyzed 03/14/01 Benzene 992 0 500 ug/l 100 ND 992 60-140 Toluene 956 0 500 100 ND 956 60-140 Ethylbenzone 103 0 500 100 ND 103 60-140 Xylenes(total) 300 0 500 300 ND 100 60-140 Surrogate a,a,a-Tnfluorotoluene 125 100 125 70-130 Matrix Spike Du (1030048-MSDI) Source L103032-04 Prepared&Analyzed 03/14/01 Benzene 9.22 0 500 u9/1 100 ND 92 2 60-140 7 31 25 Toluene 922 0 500 100 ND 922 60-140 362 25 Ethylbenzene 948 0 500 100 ND 94 8 60-140 8 29 25 Xylenes(total) 281 0 500 300 ND 937 60-140 654 25 Surrogate a aa-Trifluorotoluene 117 100 117 70-130 Sequoia Analytical-San Carlos The results in this report apply to the samples analyzed in accordance with the chat custody document This analytical report must be reproduced in its entirety Page 15 of 25