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CbCurtis&Tompkins,Ltd. <br /> Batch QC Re ort <br /> Curtis & Tompkins Laboratories Analytical Report <br /> Lab #: 211070 Location: Valero <br /> Client: Technical Studies, Inc. Prep: EPA 5030B <br /> Project#: STANDARD Analysis: EPA 8021B <br /> Matrix: Soil Diln Fac: 1.000 <br /> Units: ug/Kg Batch#: 149692 <br /> Basis: as received <br /> Type: BS Analyzed: 04/07/09 <br /> Lab ID: QC490710 <br /> AnalSpiked Result %REC Limits <br /> Benzene 50.00 49.61 99 76-120 <br /> Toluene 50.00 52.57 105 73-124 <br /> Ethylbenzene 50.00 56.19 112 76-128 <br /> m,p-Xylenes 50.00 54.69 109 75-129 <br /> o-X Xlene 50.00 55.56 111 74-129 <br /> 3urro`ate $REC Liaits <br /> Trifluorotoluene (PID) 113 40-143 <br /> Bromofluorobenzene (PID) 109 45-139 <br /> Type: BSD Analyzed: 04/08/09 <br /> Lab ID: QC490711 <br /> Anal Spiked Result %REC Limits RPD Lim <br /> Benzene 150.0 161.5 108 76-120 8 20 <br /> Toluene 150.0 166.5 111 73-124 5 23 <br /> Ethylbenzene 150.0 164.1 109 76-128 3 24 <br /> m,p-Xylenes 150.0 158.9 106 75-129 3 24 <br /> o-X lene 150.0 168.1 112 74-129 1 24 <br /> MCIto %REC Limits <br /> Trifluorotoluene (PID) 118 40-143 <br /> Bromofluorobenzene (PID) 117 45-139 <br /> RPD= Relative Percent Difference <br /> Page 1 of 1 13.2 <br /> ^f 13 <br />