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CbCurtis&Tompkins, Ltd. <br /> Batch QC Report <br /> Silica <br /> 253472 Location: DVI-Burn Pit <br /> Client: URS Corporation Prep: METHOD <br /> Project#: 17327022 Analysis: SM4500SIO2-C <br /> Analyte: Silica Batch#: 208333 <br /> Field ID: MW-2-BP Sampled: 02/18/14 <br /> MSS Lab ID: 253472-001 Received: 02/18/14 <br /> Matrix: Water Analyzed: 02/26/14 <br /> Units: mg/L <br /> Type Lab ID MSS Result Spiked Result %REC Limits RPD Lim Diln Fac <br /> LCS QC729097 8.000 8.700 109 80-120 1.000 <br /> MS QC729098 33.42 40.00 102.8 173 * 75-136 5.000 <br /> MSD QC729099 40.00 92.30 147 * 75-136 11 30 5.000 <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> tPD*= Value outside of QC limits; see narrative <br /> = Relative Percent Difference <br /> Page 1 of 1 32.0 <br /> 1 r,1 of A-1 <br />