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f <br /> STL ChromaLab Submission#: 2801-08-0260 <br /> Environmental Services(CA 1094) <br /> To: CH2M Hill-Oaklaod Test Method: 8260B <br /> Attn: Keith Sheets Prep Method: 50308 <br /> Batch QC Report <br /> Fuel Oxygenates by 82608 (Low Level) <br /> Laboratory Control Spike(LCS/LCSD) Water QC Batch#2001108120-V1.27 <br /> LCS: 2001108/20-V1.27-004 Extracted: 081201200111:06 Analyzed 08/20/200911:06 <br /> LCSD: 2001108120-V7.27-005 Extracted: 081201200911:35 Analyzed 08/201200111:35 <br /> 1 <br /> Compound Conc. [ug1L] Exp.Conc. [ug/L] Recovery[%] RPD Ctrl.Limits[%] flags <br /> i <br /> LCS LCSD LCS LCSD LCS LCSD [%] Recovery RPD LCS LCSD <br /> Methyl tert butyl ether 18.7 19.4 25 25 74.8 77.6 3.7 65-165 20 <br /> Surrogate(s) <br /> 1.2-Dichloroethane-d4 494 504 500 500 98.8 100.8 76-114 <br /> 1220 Quarry Lane•Pleasanton,CA 94556-4756 <br /> Telephone:(925)484-1919'Facsimile:(925)484-1096 <br /> Printed on,06/21/2001 11:26 Page 8 of 9 <br />