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CbCurtis &Tompkins.Ltd. <br /> Batch QC Report <br /> Curtis & Tompkins Laboratories Analytical Report <br /> fa. <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#: 149626 <br /> Basis: as received Analyzed: 04/05/09 i <br /> I <br /> i <br /> Type: BS Lab ID: QC490418 <br /> ;i; Analyte Spiked Result - %REC Limits <br /> Benzene _20.00 16. 98 85 76-120 <br /> Toluene x y 20.00 17.55 88 73-124 <br /> Ethylbenzene 20.00 17 . 67 88 76-128 <br /> m,p-Xylenes '.20.- <br /> 0.00 18.22 91 75-129 <br /> o-.Xylene 20.00 17.74 89 74-129 <br /> Surrogate %REC . Limits <br /> Trifluorotoluene (PID) 96 40-143 <br /> Bromofluorobenzene (PID) 94 45-139 <br /> Type: BSD TLab ID: QC490419 <br /> N{ <br /> Analyte._ Spiked Result �§REC.. Limits RPD Lim <br /> Benzene 2.0.00 22.05 b 110 76-120 26 * 20 <br /> Toluene 20.00 22.55 b 113 73-124 25 * 23 <br /> Ethylbenzene 20.00 22.14 b 111 76-128 23 24 <br /> m,p-Xylenes 20.00 22.17 b 111 75-129 20 24 <br /> o-X lene 20.00 20.83 b 104 74-129 16 24 <br /> i <br /> Surrogate. %REC Limits <br /> Trifluorotoluene (PID) 96 40-143 <br /> Bromofluorobenzene (PID) 92 45-139 <br /> i <br /> i <br /> I <br /> I <br /> *= Value outside of QC limits; see narrative <br /> b= See narrative <br /> RPD= Relative Percent Difference <br /> Page 1 of 1 12.0 <br /> 11 of 9 <br />