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cbCurtis&Tompkins, Ltd. <br /> Analytical Laboratories,Since 1878 <br /> Batch QC Report <br /> TCLP Metals <br /> Lab #: 187486 Location: Bridgestone/Firestone Metal Shavings <br /> Client: MWH Prep: EPA 3010A <br /> Project#: 4050530.010101 Analysis: EPA 6010B <br /> Matrix: TCLP Leachate Batch#: 114630 <br /> Units: ug/L Prepared: 06/22/06 <br /> Diln Fac: 1.000 Analyzed: 06/22/06 <br /> Type: BS Lab ID: QC344841 <br /> Analyte Spiked Result %REC Limits <br /> Arsenic 1, 000 978.8 98 80-120 <br /> Barium NA <br /> Cadmium 200.0 195.4 98 80-120 <br /> Chromium 2,000 1, 953 98 80-120 <br /> Lead 2,000 1, 906 95 80-120 <br /> Selenium 1, 000 954.0 95 80-120 <br /> Silver 200.0 184.3 92 80-120 <br /> Type: BSD Lab ID: QC344842 <br /> Analyte Spiked Result %REC Limits'' RPD Lim <br /> Arsenic 1,000 966.1 97 80-120 1 20 <br /> Barium NA <br /> Cadmium 200.0 192.8 96 80-120 1 20 <br /> Chromium 2, 000 1, 931 97 80-120 1 20 <br /> Lead 2, 000 1,880 94 80-120 1 20 <br /> Selenium 1, 000 945.0 95 80-120 1 20 <br /> Silver 200.0 181.9 91 80-120 1 20 <br /> NA= Not Analyzed <br /> RPD= Relative Percent Difference <br /> Page 1 of 1 3.0 <br />