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cbCurtis&Tompkins, Ltd. <br /> Analytical laboratories,Since 1878 <br /> Batch QC Report <br /> California Title 26 Metals <br /> Lab Location: Bridgestone/Firestone Metal Shavings <br /> Client: MWH Prep: WET <br /> Project#: 4050530.010101 Analysis: EPA 6010B <br /> Matrix: WET Leachate Batch#: 114928 <br /> Units: ug/L Prepared: 07/03/06 <br /> Diln Fac: 1.000 Analyzed: 07/03/06 <br /> Type: BS Lab ID: QC346059 <br /> Analyte Spiked Result %REC Limits <br /> Antimony 2, UUU 1, 643 82 80-125 <br /> Arsenic 1, 000 970.0 97 80-120 <br /> Barium 2, 000 1, 863 93 80-120 <br /> Beryllium 50.00 48.15 96 80-120 <br /> Cadmium 200.0 192.1 96 80-120 <br /> Chromium 2, 000 1, 944 97 80-120 <br /> Cobalt 500.0 460.5 92 80-120 <br /> Copper 250.0 227.5 91 80-120 <br /> Lead 2, 000 1,896 95 80-120 <br /> Molybdenum 400.0 375.5 94 80-120 <br /> Nickel 500.0 479.9 96 80-120 <br /> Selenium 1, 000 970.9 97 80-120 <br /> Silver 200.0 179.9 90 80-120 <br /> Thallium 1, 000 963.2 96 80-120 <br /> Vanadium 500.0 481.4 96 80-120 <br /> Zinc 500.0 476.1 95 80-120 <br /> Type: BSD Lab ID: QC346060 <br /> Analyte S iked Result %REC Limits, RPD -Lim <br /> Antimony 2,UUU 1,748 87 80-120 <br /> Arsenic 1,000 996.1 100 80-120 3 20 <br /> Barium 2,000 1, 924 96 80-120 3 20 <br /> Beryllium 50.00 49.08 98 80-120 2 20 <br /> Cadmium 200.0 198.2 99 80-120 3 20 <br /> Chromium 2,000 1, 995 100 80-120 3 20 <br /> Cobalt 500.0 470.1 94 80-120 2 20 <br /> Copper 250.0 233.3 93 80-120 2 20 <br /> Lead 2,000 1, 956 98 80-120 3 20 <br /> Molybdenum 400.0 391.8 98 80-120 4 20 <br /> Nickel 500.0 488.4 98 80-120 2 20 <br /> Selenium 1,000 1,001 100 80-120 3 20 <br /> Silver 200.0 188.6 94 80-120 5 20 <br /> Thallium 1, 000 992.5 99 80-120 3 20 <br /> Vanadium 500.0 489.1 98 80-120 2 20 <br /> Zinc 500.0 488.9 98 80-120 3 20 <br /> RPD= Relative Percent Difference <br /> Page 1 of 1 13.0 <br />