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• Gettler-Ryan/Cieostrategies(1) Project Tosco(l) 6747 Sierra Court,Suite J Project Number Tosco#5886,Stockton,CA Reported Dublin CA,94568 Project Manager Deanna Harding OS/25/0I 16 59 Total Purgeable Hydrocarbons (C6-C12), BTEX and MTBE by DHS LUFT - Quality Control Sequoia Analytical- San Carlos Reporting Spike source %REC RPD Analyte Result Unit Units level Result %REC bunts RPD butt Notes Batch 1050088-EPA 50308 Blank(1050088-BLK1) Prepared&Analyzed 05/21/01 Purgeable Hydrocarbons as Gasoline ND 500 ug/1 Benzene ND 0 500 " Toluene ND 0 500 " Ethylbenzene ND 0 500 " Xylenes(total) ND 0 500 " Methyl test-butyl ether ND $00 " Surrogate a a a-Trifluarotoluene 975 100 975 70-130 LCS(1050088-BSI) Prepared&Analyzed 05/21/01 Benzene 8 83 0 500 ug/I 100 883 70-130 e 8 66 0 500 R 100 866 70-130 cozen 882 0 500 100 88 2 70-130 Xylenes(total) 264 0 500 300 880 70-130 Surrogate a a a-Trifluorotoluene 947 " 100 947 70-130 LCS(1050088-BS2) Prepared&Analyzed 05/21/01 Purgeable Hydrocarbons as Gasoline 188 Soo ugll 250 752 70-130 Surrogate a a a-Trij4uorotoluene 997 100 997 70-130 Matrix Spike(105008&-MS1) Source L105074-15 Prepared 05/21/01 Analyzed 05/22/01 Benzene 890 0 500 ugA 100 ND 89 0 60-140 Toluene 883 0 500 " 100 ND 883 60-140 Ethylbenzene 905 0 500 100 ND 90 5 60-140 Xylenes(total) 270 0 500 300 ND 900 W140 Surrogate a a a-Trnuorotoluene 896 " 100 896 70-130 Matrix Spike Du (1050088-MSDI) Source L105074-15 Prepared 05/21/01 Analyzed 05/22/01 Benzene 871 0 500 ug/1 100 ND 871 60-140 2 16 25 Toluene 875 0 500 ]0 0 ND 875 60-140 0 910 25 Ethylbenzene 895 0 500 100 ND 88 5 60-140 223 25 Xylenes total) 266 0 500 300 ND 887 60-140 149 25 Surrogate a,a,a-Trifluorotoluene 945 " 100 945 70-130 -Mquoia Analytical-San Carlos Ae results in this report apply to the samples analyzed in accordance with the chain of custody document Ars analytical report must be reproduced in its entirety Page 22 of 28