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1551 Industrial Road <br /> � Sequoia Sanan Carlos CA 94070 <br /> 14W Analytical (fi50)232-9610 <br /> FAX(650)232-9612 <br /> www sequoialabs corn <br /> ler-Ryan/Geostrategies(1) Project Tosco(1) <br /> 7 Sierra Court,Suite J Project Number Unocal SS#08671,Stockton,CA Reporled <br /> Dublin CA,94568 Project Manager Deanna Harding 02/28/02 11 15 <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 2020067-EPA 5030B 1P/Tl <br /> LCS(2020067-13S)) _ Prepared&Analyzed 02/21/02 _ <br /> Methyl tert-butyl ether 464 1 0 ug/i 500 T 92 8 70-130 <br /> Suri ogate 1 2-Dichloi oethane-d4 51 0 500 102 70-130 <br /> Suri ogale Toluene-d8 498 300 996 70-130 <br /> Matrix SpA12020067-MSS Source L202088-03 Prepared&Analyzed 02121102 <br /> Methyl tert-butyl ether 446 1 0 1.19/1 500 36 820 60-140 <br /> Suitogate 1 2-Dichloroethane-d4 489 500 978 70-130 <br /> Suiiagate Toluene-d8 49 1 500 982 70-130 <br /> Matrix Spike Dup(2020067-MSD1_) Source L202088-03 Prepared&Analyzed 02/21/02 <br /> Methyl Cert-butyl ether 53 0 1 0 ug/1 500 3 6 98 8 60-140 172 25 <br /> Suri agate 1 2-Dichloroethane-d4 924 500 105 70-130 <br /> Suri ogate Toluene-d8 479 500 958 70-130 <br /> 0 <br /> to Analytical -San Carlos The results in this i epoi 1 apply to the samples analyzed in accordance with the chain <br /> of custody document This analytical i eport must be i epioduced in its entirety <br /> Page 12 of 16 <br />