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` Sequoia 1551 Industrial Road <br /> San Carlos, CA 94070-411 1 <br /> (650)232-9612 <br /> m%ff Analytical <br /> FAX (650) 232-9612 <br /> kiettler-Ryan/Geostrategies(1) Project: Tosco(1) Sampled: 5/20/99 <br /> 6747 Sierra Court, Suite D Project Number: Unocal SS#11195 Received: 5/20/99 <br /> Dublin,CA 94568 Project Manager: Deanna Harding Reported: 6/3/99 <br /> Volatile Organic Oxygenated Co mi by EPA Method 8260A/Quality Control. <br /> - Sequoia Analytical San Carlos <br /> Date Spike Sample QC Reporting Limit Recov. RPD RPD <br /> Analyte Analyzed Level Result Result Units Recov.Limits % Limit % Notes* <br /> Batch: 9050122 Date Prepared: 5/26/99 Extraction Method: EPA 5030B WTI <br /> Blank 9050122-BLK1 <br /> Ethanol 5/26/99 ND ug/1 1000 <br /> Tert-butyl alcohol " ND IF <br /> 200 <br /> Methyl tert-butyl ether ND 2.00 <br /> Di-isopropyl ether ND 2.00 <br /> Ethyl tert-butyl ether ND 2.00 <br /> Tert-amyl methyl ether to <br /> ND " 2.00 <br /> Surrogate: 1,2-Dichloroethane-d4 IF <br /> 50.0 49.1 If <br /> 76.0-114 98.2 <br /> Blank 9050122-BLK2 <br /> Ethanol 5/27/99 ND ug/1 1000 <br /> Tert-butyl alcohol IF <br /> ND IF <br /> 200 <br /> Methyl tert-butyl ether IF ND IF 2.00 <br /> Di-isopropyl ether " ND to <br /> 2.00 <br /> rlayl ten-butyl ether ND 2.00 <br /> f :;:.: ramyl methyl ether ND 2.00 <br /> 3ifrrogate: 1,2-Dichloroethane-d4 50.0 52.8 76.0-114 106 <br /> LCS 9050122-BSI <br /> Methyl tert-butyl ether 5/26/99 50.0 45.1 ug/l 70.0-130 90.2 <br /> Surrogate: 1,2Dichloroethane-d4 It <br /> 50.0 49.4 If <br /> 76.0-114 98.8 <br /> LCS 9050122-BS2 <br /> Methyl tert-butyl ether 5/27/99 50.0 49.8 ug/l 70.0-130 99.6 <br /> Surrogate: 1,2-Dichloroethane44 It <br /> 50.0 54.7 of 76.0-114 109 <br /> Matrix Spike 9050122-MSI L905382-19 <br /> Methyl tert-butyl ether 5/26/99 50.0 ND 45.9 ug/l 60.0-140 91.8 <br /> Surrogate: 1,2-Dichloroethane-d4 IF <br /> 50.0 48.9 of 76.0-114 97.8 <br /> Matrix Spike Dup 9050122-MSD1 L905382-19 <br /> Methyl tert-butyl ether 5/26/99 50.0 ND 45.2 ug/l 60.0-140 90.4 25.0 1.54 <br /> Surrogate: 1,2-Dichloroethane-d4 to 50.0 49.1 of 76.0-114 98.2 <br /> Batch: 9060001 Date Prepared: 6/1/99 Extraction Method: EPA 5030E [P/TI <br /> Blank 9060001-BLK1 <br /> Ethanol 6/1/99 ND ug/l 1000 <br /> Tert-butyl alcohol if ND " 200 <br /> Methyl tert-butyl ether it ND to 2.00 <br /> Di-isopropyl ether It <br /> ND to 2.00 <br /> Ethyl tert-butyl ether IF <br /> ND 12.00 <br /> )oia Analytical-San Carlos *Refer to end of report for test of notes and definitions. <br /> Page 16 of 19 <br />