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Gettler-Ryan/Geostrategies(1) Project Unocal(4) 6747 Sierra Court,Suite J Project Number Former Unocal SS#0187 Reported Dubhn CA,94568 Project Manager Deanna Harding 05/30/01 13 32 Total Purgeable Hydrocarbons (C6-C12), BTEX and MTBE by DHS LUFT - Quality Control Sequoia Analytical - San Carlos Reporting Spike Source %REC RPD Analyte Result Limit units Level Result %REC Limits RPD lamit Notes Batch 1050110-EPA 5030B(P Blank(1050110-BLK1) Prepared&Analyzed 05/25/01 Purgeable Hydrocarbons as Gasoline ND 500 ugli Benzene ND 0 500 " Toluene ND 0 500 " Ethylbenzene ND 0 500 " Xylenes(total) ND 0 500 " Methyl tert-butyl ether ND 500 " Surrogate a a a-Trtfluorotoluene 843 100 843 70-130 LCS(1050110-BS1) Prepared&Analyzed 05/25/01 Benzene 8 01 0 500 ug11 100 801 70-130 uene 8 04 0 500 100 804 70-130 benzene 8 Ol 0 500 100 801 70-130 y ones(total) 241 0 500 300 803 70-130 Surrogate a a a-7rifluorotoluene 816 100 816 70-130 LCS(1050110-BS2) Prepared&Analyzed 05/25/01 Purgeable Hydrocarbons as Gasoline 273 Soo ugA 250 109 70-130 Surrogate a a a-7}ifluorotoluene 914 " 100 914 70-130 Matrix Spike(1050110-MSI) Source L105144-17 Prepared&Analyzed 05/25/01 Benzene 867 0 500 ug/l 100 ND 967 60-140 Toluene 896 0 500 100 ND 896 60-140 Ethylbenzene 866 0 500 100 ND 866 60-140 Xylenes(total) 266 0 500 300 ND 887 60-140 Surrogate a a a-Trnuorotoluene 950 100 950 70-130 Matnx Spike Dup(1050110-MSDI) Source L105144-17 Prepared&Analyzed 05/25/01 Benzene 8 22 0 500 ugll 100 ND 82 2 60-140 533 25 Toluene 850 0 500 " 100 ND 85 0 60-140 527 25 Ethylbenzene 8 11 0 500 100 ND 81 1 60-140 656 25 Xylenes(total) 25 1 0 500 300 ND 837 60-140 580 25 Surrogate a,a,a-Trifluorotoluene 919 10 0 919 70-130 uo,a Analytical-San Carlos The results in this report apply to the samples analyzed in accordance with the chain of custody document This analytical report must be reproduced in its entirety Page 22 of 33