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Sequoia 1551 Industrial Road <br /> San Carlos, CA 94070-4111 <br /> (650) 232-9600 <br /> Analytical <br /> FAX(650) 232-9612 <br /> jcttler-Ryan/Geostrategies(1) Project: Tosco(1) Sampled: 5120199 <br /> 6747 Sierra Court,Suite D Project Number: Unocal SS#11195 Received: 5120/99 <br /> Dublin,CA 94568 Project Manager: Deanna Harding Reported: 6/3/99 <br /> Volatile:Organic Ogygenated Compounds.by EPA Metbod 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 /> Matrix Spike 9060010-MS1 L905452-02 <br /> Methyl tert-butyl ether 6/2/99 50.0 ND 57.8 ug/I 60.0-140 116 <br /> Surrogate: 1,2-Dichloroethane-d4 " 50.0 �i 51.2 It <br /> 76.0-114 102 <br /> Matrix Spike Du p 9060010-MSD1 L905452-02 <br /> Methyl tert-butyl ether _ 6/2/99 50.0 ND 56.6 ug/1 60.0-140 113 25.0 2.62 <br /> Surrogate: 1,2-Dichloroethane-d4 if 50.0 51.4 It <br /> 76.0-114 103 <br /> Batch: 9060017 Date Prepared: 612199 Extraction Method: EPA 5030B IP/Tl <br /> Blank 9060017-BLK1 <br /> Ethanol 6/2199 ND ugll 1000 <br /> Tert-butyl alcohol ND 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 /> `i q-amyl methyl ether _ _ _ _ ND 2.00 <br /> gro ate: I,Z-Dichloroethane-d4 " 50.0 _Y 48.2 76.0-114 96.4 <br /> g <br /> LCS 9060017-BSI <br /> Methyl tert-butyl ether 6/2/99_ 50.0 53.6 ug/1 70.0-130 107 <br /> Surrogate: 1,2-Dichloroethane-d4 " 50.0 49.4 " 76.0-114 98.8 <br /> Matrix Spike 9060017-MS1 L906012-01 <br /> Methyl tent-butyl ether 612/99 50.0 5.90 59.4 ug/1 60.0-140 107 <br /> Surrogate: 1,2-Dichloroethane-d4 if 50.0 50.2 It <br /> 76.0-114 100 <br /> Matrix Spike Dun 9060017-MSDI L906012-01 <br /> Methyl tert-butyl ether 612/99 50.0 5.90 58.0_ ug/l 60.0-140 104 25.0 2.84 <br /> Surrogate: 1,2-Dichloroethane-d4 50.0 49.7 76.0-114 99.4 <br /> i <br /> lquoia Analytical-San Carlos *Refer to end of report for text of noles and definitions. <br /> . i <br /> E <br /> Page 18 of 19 k <br />