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4r 819 Striker Avenue,Suite 8 <br /> Sacramento,CA 95834 <br /> Sequoia (916)921-9600 <br /> FAX(916)921-0100 <br /> Analytical www.sequoialabs.com <br /> ATC Associates Inc. -Modesto Project: SUSD Stagg HS Sampled: 6/5100 <br /> 1 1 17 Lone Palm Ave., Ste. B Project Number: 54.17292.0002 Received: 616/00 <br /> Modesto,CA 95351 Project Manager: Tom Lutterman Reported: 6/20/00 <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 Recov. Limits % Limit % Notes* <br /> Batch: 0060104 Date Prepared: 6113/00 Extraction Method. EPA 50308 PIT <br /> Blank 0060104-BLK 1 <br /> Tert-butyl alcohol 6/13/00 ND ug/l 200 <br /> Methyl tert-butyl ether ND 2.00 <br /> Di-isopropyl ether ND 2.00 <br /> Ethyl tcrt-butyl ether ND 2.00 <br /> Tert-amyl methyl ether ND 2.00 <br /> Ethanol ND " 3000 ___-- <br /> Surrogate: 1,2-DC.4-d4 50.0 47.0 60.0-140 94.0 <br /> LCS 0060104-BS1 <br /> Methyl tert-butyl ether 6/13/00 50.0 47.2 ug/1 70.0-130 94.4 <br /> Surrogate: 1,2-DCA-d4 " 50.0 49.6 60.0-140 99.2 <br /> AM pup 0060104-BSD1 111O _ -- 2 <br /> - <br /> yl tert-butyl ether 6/13/00 50.0 67.6 ug/I 70.0-130 135 25.0 35.4 2 <br /> Surrogate: 1,2-DCA-d4 1150.0 44.8 60.0-140 89.6 <br /> Matrix Spike 0060104-MS1 5006067-03 <br /> Methyl tert-butyl ether 6/13/00 50.0 735 807 ug/1 60.0-140 144 3 <br /> Surrogate: 1,2-DCA-d4 50.0 50.8 60.0-140 102 <br /> Matrix Spike Dup 0060104-MSD1 S006067-03 <br /> Methyl tert-butyl ether 6/13/00 50.0 735 812 ug/I 60.0-140 154 25.0 6.71 3 <br /> Surrogate: 1,2-DCA-d4 50.0 51.6 60.0-140 103 <br /> i <br /> Sequoia Analytical-Sacramento *Refer to end of report far text of notes and definitions. <br /> Page 5 of6 <br />