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cbCurtis&Tompkins, Ltd. <br /> Analytical Laboratories,Since 1878 <br /> Batch QC Report <br /> California Title 26 Metals- <br /> La Location: Bridgestone/Firestone Meta Shavings <br /> Client: MWH Prep: EPA 3050B <br /> Pro'ect#: 4050530.010101 Anal sis: EPA 6010B <br /> Matrix: Soil Batch#: 114869 <br /> Units: mg/Kg Prepared: 06/30/06 <br /> Basis: as received Analyzed: 06/30/06 <br /> Diln Fac: 1.000 <br /> Type: BS Lab ID: QC345784 <br /> Analyte ''Spiked Result REC Limits` <br /> Antimony iuu.0 93.664 80-120 <br /> Arsenic 50.00 50.89 102 80-120 <br /> Barium 100.0 99.03 99 80-120 <br /> Beryllium 2.500 2.645 106 80-120 <br /> Cadmium 10.00 10.23 102 80-120 <br /> Chromium 100.0 100.9 101 80-120 <br /> Cobalt 25.00 24.71 99 80-120 <br /> Copper 12.50 12.42 99 80-120 <br /> Lead 100.0 98.04 98 80-120 <br /> Molybdenum 20.00 20.22 101 80-120 <br /> Nickel 25.00 24.57 98 80-120 <br /> Selenium 50.00 50.21 100 80-120 <br /> Silver 10.00 9.848 98 80-120 <br /> Thallium 50.00 49.91 100 80-120 <br /> Vanadium 25.00 25.25 101 80-120 <br /> Zinc 25.00 25.23 101 80-120 <br /> Type: BSD Lab ID: QC345785 <br /> Analyte Spiked Result %REC Limits;r RPD Lim <br /> Antimony luu.0 96.11 96 80-120 3 20 50.00 51.33 103 80-120 1 20 <br /> Barium 100.0 100.4 100 80-120 1 20 <br /> Beryllium 2.500 2.690 108 80-120 2 20 <br /> Cadmium 10.00 10.33 103 80-120 1 20 <br /> Chromium 100.0 102.9 103 80-120 2 20 <br /> Cobalt 25.00 25.09 100 80-120 2 20 <br /> Copper 12.50 12.62 101 80-120 2 20 <br /> Lead 100.0 99.21 99 80-120 1 20 <br /> Molybdenum 20.00 20.68 103 80-120 2 20 <br /> Nickel 25.00 25.03 100 80-120 2 20 <br /> Selenium 50.00 50.74 101 80-120 1 20 <br /> Silver 10.00 10.02 100 80-120 2 20 <br /> Thallium 50.00 50.89 102 80-120 2 20 <br /> Vanadium 25.00 25.81 103 80-120 2 20 <br /> Zinc 25.00 25.65 103 80-120 2 20 <br /> RPD= Relative Percent Difference <br /> Page 1 of 1 7,0 <br />