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1551 Industrial Road <br /> San Caftos,CA 94070-41 11 <br /> Sequoia (650}232.9600 <br /> FAX(650)232-612 <br /> Analytical <br /> www.sequoWabs.com <br /> Gettier-Ryan/Geostrategies(1) Project: Tosca(2) Sampled: 8/28/00 <br /> 6747 Sierra Court,Suite d Project Number. Unocal SS#11195/3 6500 So.Interstate I-5,Ladffi*eived: 8/28/00 <br /> Dublin,CA 94568 Project Manager: Deanna llardin : 9/14/00 <br /> Pit <br /> Date Spike Sample QC Reporting Limit Recov. RPD RPD <br /> Anal Analyzed Level Result Result Units Recov.Limits % Limit % Notes* <br /> Batch: 0080132 Date Prepared: 8/29160 Extraction Method: EPA 5030B MM <br /> Blank 0080132-BLK1 <br /> Ethanol 8129100 ND ug/l 1000 <br /> Tort-butyl alcohol It ND if 100 <br /> Methyl tat butyl ether If <br /> ND It 2.00 <br /> Di-isopropyl ether ND 2.00 <br /> Ethyl tat-butyl ether ND 2.00 <br /> Tert-amyl methyl ether ND 2.00 <br /> Surrogate. .1,2-Dichloroethane-& " 50.0 49.9 " 76.0-114 99.8 <br /> Blank 0080132-BLK2 <br /> Ethanol 8130/00 ND ugll 1000 <br /> Tat butyl alcohol IFND100 <br /> Methyl tort-butyl.ether TVND IF <br /> 2.00 <br /> Di-isopropyl ether TO ND IF 2.00 <br /> Ethyl tert-butyl ether ND " 2.00 +' <br /> Tart-amyl methyl ether ND " 2.00 <br /> Surrogate: 1,1-Dichloroethane-& " 50.0 51.6 76.0-114 103 <br /> L S 0080132-BSI <br /> Methyl tart butyl ether 8/29/00 50.0 52.1 ug/l 70.0-130 104 <br /> Surrogate. 1,2 Dichloroethane-d4 50.0 50.4 76.0-114 101 <br /> LCS 0080132-BS2 <br /> Methyl tert-butyl ether 8/30/00 50.0 52.6 ug/1 70.0-130 105 <br /> Surrogate: 1,2 Dichloroethane-& IF 50.0 51.0 If 76.0-114 104 <br /> Matrix SR& 0080132-MS1 L008198-01 <br /> Methyl tert-butyl ether 8129/00 50.0 ND 46.7 ug/1 60.0-140 93.4 <br /> Surrogate: 1,2 Dichloroethane-d4 50.0 50.5 IF76.0-114 101 <br /> Matrix Spike Duo 0_080132-MSDI L008198-01 <br /> Methyl tert-butyl ether 8/29/00 50.0 ND 53.3 ug/! 60.0-140 107 25.0 13.6 <br /> Surrogate: 1,2 Dichloroethane-d4 OF 50.0 51.3 or 76.0-114 103 <br /> Batch: 0080144 Date Prepared: 8130/00 Extraction Method: EPA 5030BIFfn <br /> Disk 0080144-BLKI <br /> Ethanol 8/30/00 ND ug/l 1000 <br /> Tart-butyl alcohol " ND " 100 <br /> Methyl tert butyl ether it ND 2.00 <br /> Di-isopropyl ether it . . ND 2.00 <br /> Ethyl tert-butyl ether IfND 2.00 <br /> Sequoia Analytical-San Carlos *Refer to end of report for text of notes and definihons.4 <br /> Page 17 of 20 <br />