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IDSequoia 819 Striker Avenue, Suite 8 <br /> Sacramento, CA 95834 <br /> Analytical (9161921-9600 <br /> FAX(916) 921-0100 <br /> EMCON/1T-,Sacramento Project: ARCO 2186, Stockton,CA Sampled: 1213199 <br /> 1433 N.Market Blvd.,91 Project Number: 792232 Received: I2/6199 <br /> Sacramento,CA 95834 Project Manager: Dave Foley Reported: 12/20/99 <br /> Volatile Oxygenate Compounds by EPA Method 8260A/0uality Contrbl <br /> Sequoia Analytical-Sacramento <br /> Date Spike Sample QC Reporting Limit Recov. RPD RPD <br /> LAnlyte Analyzed Level Result Result Units Recov.Limits % Limit % Notes* <br /> Blank(continued) 9120211-BLKI <br /> Surrogate: 1,2-DCA-d4 50.0 57.8 60.0-140 116 <br /> Blank 9120211-BLK2 <br /> Tert-butyl alcohol 12/17/99 ND ugll 200 <br /> Methyl tert-butyl ether ND 2.00 <br /> Di-isopropyl ether ND " 2.00 <br /> Ethyl tent-butyl ether ND 2.00 <br /> Tert-amyl_methyl ether ND 2.00 <br /> Surrogate: 1,2-DCA-d4 50.0 564 , 60.0-140 113 <br /> LCS 9120211-11SI <br />_M 1 tert-butyl ether 12/16/99 50.0 62.8 ug/l 70.0-130 <br /> Ste: 1,2-DCA-d4 50.0 57.8 60.0-140 116w. <br /> _ <br /> LCS Dun 9120211-BSD1 <br /> Methyl tert-butyl ether 12/16/99 50.0 59.2 ug/l 70.0-130 118 25.0 6.56 _ <br /> Surrogate: 1,2-DCA-d4 " 50.0 57.2 " 60.0-140 114 <br /> Matrix Solke 9120211-MSI S912137-01 <br /> Methyl tert-butyl ether 12/16/99 50.0 ND 52.8 Ug/1 60.0-140 106 <br /> Surrogate: 1,2-DCA7d4 50.0 55.6 60.0-140 111 <br /> Matrix Spike Dup 9120211-MSDI S912137-01 <br /> Methyl tert-butyl ether 12/16/99 50.0 ND 55.8 Ug/1 60.0-140 112 25.0 5.50 <br /> Surrogate: 1,2-DCA-d4 50.0 57.0 60.0-140 114 <br /> S is Analytical-Sacramento I'Refer to end of report for text of notes and definitions. <br /> Page 8 of 9 <br />