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ibCurtis &Tompkins.Ltd. <br /> Batch QC Report <br /> Gasoline Oxygenates by GC/MS <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: QC490648 Diln Fac: 1.000 <br /> Matrix: Soil Batch#: 149679 <br /> Units: ug/Kg Anal zed: 04/07/09 <br /> salt %REC Limits <br /> .. <br /> tert-Butyl Alcohol (TBA) 125.0 111.0 89 56-140 <br /> MTBE 25.00 24.07 96 66-129 <br /> Isopropyl Ether (DIPS) 25.00 23.51 94 65-131 <br /> Ethyl tert-Butyl Ether (ETBE) 25.00 23.54 94 66-132 <br /> Meth 1 tert-Am 1 Ether (TAME) 25.00 23.54 94 75-128 <br /> Surrogate %REC Limits <br /> Dibromofluoromethane 101 71-128 <br /> 1,2-Dichloroethane-d4 93 69-135 <br /> Toluene-d8 100 80-120 <br /> Bromofluorobenzene 99 77-131 <br /> Page 1 of 1 7.0 <br /> 7A Af 7 <br />