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Gettler-Ryan/Geostrategies(1) Project Tasco(1) <br /> 6747 Sierra Court, Suite J Project Number Unocal Circle K SS#1205,Lathrop,CA Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 05/10/01 15 16 <br /> Volatile Organic 8 Oxygenated Compounds by EPA-Method-8260B-- Quality Control— <br /> Sequoia Analytical - San Carlos <br /> Reporting Spike Source %REC RPD <br /> Analyte Result 1km11 Units level Result %REC limits RPD Limit Notes <br /> Batch 1040099- EPA 5030B [P/TJ <br /> Matrix Spike(1040099-MSI) Source L104171-04 Prepared&Analyzed 04/27/01 <br /> Methyl tert-bury]ether 517 200 ug/1 500 ND 103 60-140 <br /> Surrogate 12-Dichloroethane-d4 492 500 984 76-114 <br /> Surrogate 7'oluene-d8 498 500 996 88-110 <br /> Matrix Spike Dup(1040099-MSD1) Source L104171-04 Prepared&Analyzed 04/27/01 <br /> Methyl ten-butyl ether 51 1 200 ugA 500 ND 102 60-140 1 17 25 <br /> Surrogate 12-Dachloroethane-d4 48 7 500 974 76-114 <br /> Surrogate Toluene-d8 498 500 996 88-110 <br /> • <br /> Sequoia Analytical- San Carlos The results in this report apply to the samples analyzed in accordance with the cha <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 15 of 16 <br />