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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#: 114947 <br /> Matrix: Water Prepared: 07/03/06 <br /> Units: ug/L Analyzed: 07/03/06 <br /> Diln Fac: 1.000 <br /> ' Type Lab IDSpiked Result %REC Limits RPD Lim <br /> BS QC346128 5.000 5.050 101 80-120 <br /> BSD QC346129 5.000 5.090 102 80-120 1 20 <br /> RPD= Relative Percent Difference <br /> Page 1 of 1 16.0 <br />