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Sequoia 1551 Industrial Road <br /> e <br /> San Carlos <br /> 0 <br /> 23 <br /> (650)232-964-960D <br /> Analytical FAX(650232-9612 <br /> bs <br /> vuwu sequoia:slabs tomom <br /> Gettler-RyanlGeostrategies(I) Project Tosco(1) <br /> 6747 Sierra Court Suite] Project Number Tosco(Unocal)SS#6981 Stockton CA Reported <br /> Dublin CA 94568 Project Manager Deanna Harding 49/27/01 10 19 <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 Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 1090076-EPA 5030E IP/T1 <br /> LCS(1090076-BSI) Prepared&Analyzed 09/20/0) <br /> Methyl tert-butyl ether 520 20 ugh 500 104 70-130 <br /> Surrogate 12-Dichloroethane-d4 512 500 102 76-114 <br /> Surrogate Toluene-d8 510 500 102 88-110 <br /> Matrix Spike(1090076-MSI) Source L109080-18 Prepared&Analyzed 09/20/01 <br /> Methyl tent-butyl ether 626 20 ugll 500 20 852 60-140 <br /> Surrogate 1,1-Dichloroethane-d4 525 500 105 76-114 <br /> Surrogate Toluene-d8 489 500 978 88-110 <br /> Matrix Spike Du (1090076-MSD1) Source L109080-18 Prepared&Analyzed 09/20/01 <br /> Methyl tett-bury]ether 667 20 ugll 500 20 934 60-140 634 25 <br /> Surrogate l 2-Dichloroethane-d4 -524 500 105 76-114 <br /> Surrogate Toluene-d8 501 500 100 88-110 <br /> Sequoia Analytical-San Carlos The results in this report apply to the samples analyzed m accordance with the chain <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 20 of 21 <br />