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i <br /> Curtis &Tompkins,Ltd. <br /> Batch QC Report <br /> Gasoline Oxygenates by GC/XS <br /> Lab #: 211070 Location: Valero <br /> Client: Technical Studies, Inc. Prep: EPA 5030B <br /> Project#: STANDARD Analysis: EPA 8260B j <br /> Field ID: zzzzzzzzzz Diln Fac: 0.9862 <br /> MSS Lab ID: 211102-002 Batch#: 149648 <br /> Matrix: Soil Sampled: 03/31/09 <br /> Units: ug/Kg Received': 04/02/09 <br /> Basis: as received Analyzed: 04/06/09 <br /> Type: MS Lab ID: QC490584 <br /> Analyte' MSS Result Spiked '-' . Result AREC Limits <br /> tert-Butyl Alcohol (TBA) <19.72 246.5 269. 9 109 42-139 <br /> MTBE. <0. 9862 49.31 ~46.29 .94 53-127 <br /> Isopropyl Ether (DIPE) <0. 9862 49.31 39.72 81 49-130 <br /> Ethyl tert-Butyl Ether (ETBE) <0. 9862 49.31 40.38 82 52-130 i <br /> Methyl tert-Amyl Ether (TAME) <0. 9862 49.31 35.82 73 58-126- <br /> i <br /> Surrogate . %REC Limits " <br /> i <br /> Dibromofluoromethane 111 71-128 <br /> 1,2-Dichloroethane-d4 117 69-135 <br /> Toluene-d8 99 80-120 <br /> Bromofluorobenzene 114 77-131 <br /> Type: MSD Lab ID: QC490585 <br /> Analyte Spiked ": Result -AREC Limits RPD .Lim <br /> tent-Butyl Alcohol (TSA) 246.5 242.8 98 42-139 11 36 <br /> MTBE 49.31 41. 95 85 53-127 10 28 <br /> Isopropyl Ether (DIPE) 49.31 37.53 76 49-130 6 27 <br /> Ethyl tert-Butyl Ether (ETBE) 49.31 39.46 80 52--130 2 26 <br /> Methyl tert-Amyl Ether (TAME) 49.31 34 .51 70 58-126 4 25 <br /> i <br /> Surrogate %REC Limits <br /> Dibromofluoromethane 107 71-128 <br /> 1,2-Dichloroethane--d4 101 69-135 <br /> Toluene-d8 88 80-120 <br /> Bromofluorobenzene 127 77-131 <br /> I <br /> I <br /> RPD= Relative Percent Difference <br /> Page 1 of 1 6.0 <br /> i <br /> I <br /> 97 of '7 <br />