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Curtis&Tompkins, Ltd. <br /> Analytical Laboratories,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 7470A <br /> Analyte: Mercury Batch#: 114898 <br /> Matrix: Water Prepared: 06/30/06 <br /> Units: ug/L Analyzed: 06/30/06 <br /> Diln Fac: 1.000 <br /> Type Lab ID Spiked Result %REC Limits RPD Lim <br /> BS QC345900 5.000 4.980 100 80-120 <br /> BSD QC345901 5.000 5.060 101 80-120 2 20 <br /> RPD= Relative Percent Difference <br /> Page 1 of 1 23.0 <br />