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iCb Curtis&Tompkins,Ltd. <br /> Batch QC Report <br /> Dissolved Silica <br /> Lab #: 253472 Location: DVI-Burn Pit <br /> Client: URS Corporation Analysis: SM4500SIO2-C <br /> Project#: 17327022 <br /> Analyte: Silica Batch#: 208300 <br /> Field ID: MW-2-BP Sampled: 02/18/14 <br /> MSS Lab ID: 253472-001 Received: 02/18/14 <br /> Matrix: Filtrate Analyzed: 02/25/14 <br /> Units: mg/L <br /> Type Lab ID MSS Result Spiked Result %REC Limits RPD Lim Diln Fac <br /> LCS QC728960 10.00 7.800 98 80-120 1.000 <br /> MS QC728961 28 . 12 40.00 98.90 177 * 75-136 5.000 <br /> MSD QC728962 40.00 90.20 155 * 75-136 9 30 5.000 <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> *= Value outside of QC limits; see narrative <br /> PD= Relative Percent Difference <br /> age 1 of 1 29.1 <br /> 1 r%ri of A-1 <br />