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Q <br /> Curtis &Tompkins.Ltd. <br /> Batch_ QC Report <br /> Gasoline Oxygenates by GC/MS <br /> Lab #: 211070 Location: Valero <br /> Client: Technical Studies, Inc. Prep: EPA 50308 <br /> Project#: STANDARD' Analysis: EPA 8260B <br /> Field ID: ZZZ.ZZZZZZZ Batch#: 149679 <br /> MSS Lab ID: 211018-002 Sampled: 03/25/09 <br /> Matrix: Soil Received: 03/28/09 <br /> Units: ug/Kg Analyzed: 04/07/09 <br /> Basis: as received <br /> Type: MS Diln Fac: 1.340 <br /> Lab ID: QC490772 t <br /> Analyte MSS Result Spiked. Result %REC Limits <br /> tert-Butyl Alcohol (TBA). <23.42 335.1 333.9 100 42-139 <br /> MTBE <1.171 67.02 58.17 87 53-127 <br /> Isopropyl Ether (DIPE) <1.171 67.02 62.47 93 49-130 <br /> Ethyl tent-Butyl Ether (ETBE) <1. 171 67.02 60.16 90 52-130 <br /> Methyl tert-Amyl Ether (TAME) <1. 171 67.02 56.39 84 58-126 , <br /> Surrogate %REC Limits <br /> I <br /> Dibromofluoromethane 108 71-128 <br /> 1, 2-Dichloroethane-d4 111 69-135 <br /> Toluene-d8 98 80-120 <br /> Bromofluorobenzene 93 77-131 <br /> i <br /> f Type: MSD Diln Fac: 1.370 <br /> Lab ID: QC490773 <br /> 'Analyte Spiked Result $REC ..Limits RPD Lim <br /> 'tert-Butyl Alcohol (TBA) 342.5 323.1 94 42-139 5 36 <br /> MTBE 68.49 63.72 93 53-127 7 28 <br /> Isopropyl Ether (DIPE) 68.49 65.44 96 49-130 2 27 <br /> Ethyl tert-Butyl Ether (ETBE) 68.49 62.62 91 52-130 2 26 <br /> Methyl tert-Amyl_ Ether (TAME) 68.,49 59.06 86 58-126 2 25 <br /> Surrogate %REC Limits - <br /> Dibromofluoromethane 108 71-128 <br /> 1, 2-Dichloroethane-d4 111 69-135 <br /> Toluene-d8 96 80-120 <br /> Bromofluorobenzene 96 77-131 <br /> RPD= Relative Percent Difference <br /> Page 1 of 1 g'a <br /> 7Qnf7 <br />