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cbCurtis&Tompkins, Ltd. <br /> Analytical Laboratores,Since 1878 <br /> Batch QC Report <br /> California Title 26 Metals <br /> Lab #: 187700 Location: Bridgestone/Firestone Metal Shavings <br /> Client: MWH Prep: METHOD <br /> Project#: 4050530.010101 Analysis: EPA 7471A <br /> Analyte: Mercury Diln Fac: 1.000 <br /> Matrix: Soil Batch#: 114855 <br /> Units: mg/Kg Prepared: 06/29/06 <br /> Basis: as received Analyzed: 06/29/06 <br /> Type Lab ID Spiked Result %REC' Limits RPD Lim <br /> BS QC345737 0.5000 0.5050 101 80-120 <br /> BSD QC345738 0.5000 0.5050 101 80-120 0 20 <br /> RPD= Relative Percent Difference <br /> Page 1 of 1 5.0 <br />