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C H p O INC. <br /> N C. Submission #: 1999-06-0442 <br /> 'I�7 R Environmental Senncesl(SOB) <br /> To Wright Environrlowtal Services Inc Test Method. 826OAw <br /> Attn. Mana Reid Prep Method 8260A <br /> Batch QC Report <br /> Fuel Oxygenates by GC/MS <br /> Laboratory Control Spice(LCS/LCSD) Water QC Batch # 1999/07102-01 06 <br /> LCS 1999/0742-01 06-002 Extracted 0710211999 09 45 Analyzed 071OZ1999 09 45 <br /> LCSD 1999107102-0106-003 Extracted 07/02119991011 Analyzed 07/02319991011 <br /> Compound Conc [ ug/L j Exp Conc ( ug/L lRecovery(%) RPD Ctrl Limits(°/61 I Flags <br /> LCS I LCSD LCS LCSD I LC5 LCSD [%] RecoverylRPO I LCS LCSD <br /> Methyl tent-butyl ether 425 451 500 50 o85 0 90 2 S 9 55-165 20 <br /> Surrogate(s) <br /> 1,2-Dichlomethane-d4 497 415 500 50o 994 I 830 76-114 <br /> 1220 Quarry Lane'Pleasanton,CA 94566-4755 <br /> Telephone (925)484-1919'Facsimile (925)4841096 <br /> Printed on 071081199815 34 Page 14 of 16 <br />