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cbCurtis &Tompkins,Lid. <br /> Batch QC Report <br /> Dissolved Hexavalent Chromium <br /> ' Lab #: 227030 Location: DVI-Burn Pit <br /> Client: URS Corporation Prep: METHOD <br /> Project#: DVI-BP Analysis: EPA 7199 <br /> Field ID: MW-2-BP Batch#: 173400 <br /> MSS Lab ID: 227030-001 Sampled: 04/04/11 12:17 <br /> Units: ug/L Received: 04/04/11 <br /> Type: LCS Diln Fac: 1.000 <br /> Lab ID: QC586269 Analyzed: 04/04/11 20:30 <br /> Matrix: Water <br /> Analyte Spiked Result %REC Limits <br /> Hexavalent Chromium 20. 00 20.78 104 90-110 <br /> ' Type: MS Diln Fac: 1.010 <br /> Lab ID: QC586270 Analyzed: 04/04/11 21:58 <br /> Matrix: Filtrate <br /> ' Analyte MSS Result Spiked Result '' %REC Limits <br /> Hexavalent Chromium <0.1250 10.10 9.903 98 85-115 <br /> Type: MSD Diln Fac: 1.010 <br /> Lab ID: QC586271 Analyzed: 04/04/11 22:11 <br /> Matrix: Filtrate <br /> Analyte Spiked Result %REC Limits RPD Lim <br /> Hexavalent Chromium 10.10 10.06 100 85-115 2 20 <br /> RPD= Relative Percent Difference <br /> Page 1 of 1 47'0 <br /> 59 of 69 <br />