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Curtis &Tompkins.Ltd. <br /> Batch QC Report <br /> Gasoline Oxygenates by �;C/MSN <br /> Lab #: 211070 Location: "` Valero <br /> Client: Technical Studies, Inc. Prep: EPA 5030B <br /> Project#• STANDARD Analysis: EPA 8260B <br /> Type: LCS Basis: as received <br /> Lab ID: QC490506 Diln Fac: 1.000 <br /> Matrix: Soil Batch#: 149648 <br /> Units: _ug/Kg Analyzed: 04/06/09 <br /> Analyte Spiked Result' %REC Limits <br /> tert-Butyl Alcohol (TBA) 125.0 124.6 100 56-140 <br /> MTBE 25.00 26.20 105 66-129 <br /> Isopropyl Ether (DIPE) 25.00 25. 90 104 65-131 <br /> Ethyl tert-Butyl Ether (ETBE) 25.00 24.95 100 66-132 <br /> Methyl tert-Am 1 Ether (TAME) 25.00 ;1. . 22!;66 91 75-128 <br /> Surrogate %REC Limits. ql� <br /> Dibromofluoromethane 103 71-128 <br /> 1,2-Dichloroethane-d4 103 69-135 <br /> Toluene-d8 95 80-120 <br /> Bromofluorobenzene 102 ,. 77--131 ° .. <br /> Page 1 of 1 5.0 <br /> 7AMf7 <br />