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Sequoia <br /> 819 Striker Avenue, Suite 8 <br /> ID 4 I. Sacramento,CA 95834 <br /> � Analytical (916)921-9600 <br /> FAX(916)921-0100 <br /> 40 -- <br /> EMCONAT-Sacramento Project: ARCO 2186,Stockton,CA Sampled: 12/3/99 <br /> 1433 N.Market Blvd.,#I Project Number: 792232 Received: 12/6199 <br /> Sacramento,CA 95834 Pro'ect Manager. Dave Foley Reported: 12/20/99 <br /> Volatile'Oxygenate Cotipoiunds by EPA Method 8260A/Quality Control <br /> Sequoia Analytical -Sacramento <br /> Date Spike Sample QC Reporting Limit Recov. RPD RPD <br /> Analyte Analyzed Level Result Result Units Recov.Limits % Limit % Notes* <br /> Batch: 9120196 Date Prepared: 12/15/99 Extraction Method: EPA 50308 P/'1 <br /> Blank 9120196-BLK1 <br /> Tert-butyl alcohol 12/15/99 ND ug/I 200 <br /> Methyl tent-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 ND 2.00 <br /> Surrogate: 1,2-DCA-d4 50.0 55.2 60.0-140 110 <br /> Blank 9120196-BLK2 <br /> Tert-butyl alcohol 12/16/99 ND up/l 200 <br /> Methyl tert-butyl ether ND 2.00 <br /> Di-isopropyl ether ND 2.00 <br /> Et tent-butyl ether ND 2.00 <br /> T yl methyl.ether _ ND _ 2.00 <br /> Su gate: 1,2-DCA-d4 50.0 47.8 60.0-140 95.6 -------- --� <br /> L,CS 9120196-BS 1 <br /> Methyl tert-butyl ether 12/15/99 50.0 55.4 ugil 70.0-130 111 <br /> Surrogate., 1,2-DCA-d4 50.0 5.3.1 60.0-140 106 <br /> LCS Dun 9120196-BSD] <br /> Methyl tert-butyl ether 12/15/99 50.0 60.2 ug/1 70.0-130 120 25.0 7.79 <br /> Surrogate: 1,2-DCA-d4 " 50.0 57.8 " 60.0-140 116 <br /> Matrix Spike 9120196-MS1 ' S912052-01 <br /> Methyl tert-butyl ether 12/15/99 50.0 '31.6 88.2 ug/I 60,0-140 113 <br /> Surrogate: 1.2-DCA-d4 1150.0 54.2 60.0-140 108 <br /> Matrix Spike Dun 9120196-MSD1 5912052-01 <br /> Methyl tert-butyl ether 12/I5/99 50.0 31.6 90.0 ug/1 60.0-140 117 _25.0 3.48 <br /> Surrogate: 1,2-DCA-d4 1150.0 56.4 1160.0-140 113 <br /> Batch: 9120211 Date Prepared: 12/16/99 Extraction Method: EPA 5030B_IP/T1 <br /> Blank 9120211-BLKI <br /> Tort-butyl alcohol 12/16/99 ND ug/1 200 <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 ND 2.00 <br /> Se4Wa Analytical-Sacramento *Refer to end ofreportfor text ofnotes and definitions. <br /> Page 7 of 9 <br />