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819 Striker Avenue,Suite 8 <br /> Sequoia Sacramento,CA 95834 <br /> (916)921-9600 <br /> FAX(916)921-0100 <br /> Analytical www.sequoialabs.corn <br /> ATC Associates Inc. -Modesto Project: SUSD Stagg HS Sampled: 918100 <br /> 1117 Lone Palm Ave., Ste. B Project Number: 54.17292.0002 Received: 9/11/00 <br /> Modesto, CA 95351 Project Manager: Tom Lutterman Reported: 9/23/00 <br /> Volatile Oxygenate Compounds 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 Rccov. Limits % Limit % Notes* <br /> Batch: 0090199 Date Prepared: 9121/00 Extraction Method: EPA 5030B1� <br /> Blank 0090199-BLK1 <br /> Tert-butyl alcohol 9/21/00 ND ug/l 200 <br /> Methyl tert-butyl ether 11 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 /> Ethanol ND 3000 <br /> Surrogate: 1,2-DCA-d4 50.0 48.8 60.0-140 97.6 <br /> LCS 0090199-BSI <br /> Methyl tcrt-butyl ether 9/21/00 50.0 49.8 ug/l 60.0-140 99.6 <br /> Surrogate: 1,2-DCA-d4 11 50.0 50.8 60.0-140 102 <br /> Du 0090199-BSD 1 <br /> .yl tert-butyl ether 9121100 50.0 49.8 ug/l 60.0-140 99.6 25.0 0 <br /> Surrogate: 1,2-DC.4-d4 50.0 51.6 60.0-140 103 <br /> Matrix Spike 0090199-MSI 5009114-01 <br /> Methyl tert-butyl ether 9/21/00 50.0 ND 52.0 ug/l 60.0-140 104 <br /> Surrogate: 1,2-DCA-d4 50.0 44.6 lo60.0-140 89.2 <br /> Matrix Spike Dup 0090199-MSD1 S009114-01 <br /> Methyl tert-butyl ether 9/21/00 50.0 ND 52.8 ug/l 60.0-140 106 25.0 1.90 <br /> Surrogate: 1,2-DCA-d4 50.0 45.6 60.0-140 91.2 <br /> i <br /> Sequoia Analytical-Sacramento *Refer to end of report for text of notes and definitions. <br /> Page 5 of 6 <br />