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' CHROMALAB, INC. Submission # 1999-08-0176 <br /> Environmental Services(SDB) <br />' To Aqua Science Engineers, Inc Test Method 8260A <br /> Attn Ian T Reed Prep Method 8260A <br /> Batch QC Report <br /> Fuel Oxygenates by GC/MS <br /> rMatrix Spike ( MS 1 MSD ) Water QC Batch # 1999108120-01 07 <br /> Sample ID MW-9 Lab Sample ID 1999-08-0176-009 <br /> MS 1999/08120-01 07-004 Extracted 08/20/1999 15 35 Analyzed 08/20/1999 15 35 Dilution 1 0 <br /> MSD 1999/08120-01 07-005 Extracted 08/20/1999 16 03 Analyzed 08/20/1999 16 03 Dilution 1 0 <br />' Compoundmpound IConc ug/L I Exp Conc ug/L Recovery [%) RPD - Ctrl Limits - Flags — <br /> MS MSD Sample MS MSD MS 1 MSD I [%) RecoveryRPD MS MSD <br /> Methyl tert-butyl ether 1519 449 IND I 500 500 103 81 89 61 14 5 65-165 20 <br /> Surrogate(s) f <br /> 1 2-Dichloroethane-d4 480 436 1 500 50096 0 87 2 76-134 <br /> 1 <br /> 1 <br /> r <br /> r <br /> r <br /> 1220 Quarry Lane'Pleasanton, CA 94566-4756 <br /> Telephone (925)484-1919'Facsimile (925)484-1096 <br /> Printed on 08/23/1999 17 18 Page 7 of 7 <br />