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CbCurtis &Tompkins.Lid. <br /> Batch QC Report ' <br /> Dissolved Hexavalent Chromium <br /> Lab #: 227645 Location: DVI-Burn Pit , <br /> Client: URS Corporation Prep: METHOD <br /> Project#: DVI-BP Analysis: EPA 7199, , <br /> Field ID: ZZZZZZZZZZ Batch#: 174326 <br /> MSS Lab ID: 227653-002 Sampled: 05/02/11 08:35 <br /> Matrix: Water Received: 05/02/11 <br /> Units: ug/L , <br /> Type: LCS Diln Fac: 1.000 ' <br /> Lab ID: QC589926 Analyzed: 05/02/11 23 :29 <br /> Analyte .Spiked.. Result %REC Limits <br /> Hexavalent Chromium 20.00 20 .71 104 90-110 <br /> Type: MS Diln Fac: 1.010 , <br /> Lab ID: QC589927 Analyzed: 05/03/11 02:26 <br /> Analyte MSSResultSpiked Result %REC Limits , <br /> Hexavalent Chromium 9.826 10.10 20. 07 101 85-115 <br /> Type: MSD Diln Fac: 1.010 , <br /> Lab ID: QC589928 Analyzed: 05/03/11 02:38 <br /> Analyte Spiked Result %REC Limits RPD Lim ' <br /> Hexavalent Chromium 10.10 20.21 1D3 85-115 1 20 <br /> RPD= Relative Percent Difference ' <br /> Page 1 of 1 <br /> 9.1 <br /> 41 of 47 <br />