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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 Metal Shavings <br /> Client: MWH Prep: EPA 3010A <br /> Project#: 4050530.010101Anal sis: EPA 6010B <br /> Matrix: TCLP Leachate Batch 114939 <br /> Units: ug/L Prepared: 07/03/06 <br /> Diln Fac: 1.000 Analyzed: 07/03/06 <br /> Type: BS Lab ID: QC346086 <br /> Analyte S iked Result %REC Limits <br /> Antimony 2, UUU - <br /> Arsenic 1, 000 966.6 97 80-120 <br /> Barium 2, 000 1, 929 96 80-120 <br /> Beryllium 50.00 47.79 96 80-120 <br /> Cadmium 200.0 207.1 104 80-120 <br /> Chromium 2,000 1, 952 98 80-120 <br /> Cobalt 500.0 457.7 92 80-120 <br /> Copper 250.0 235.1 94 80-120 <br /> Lead 2, 000 2,011 101 80-120 <br /> Molybdenum 400.0 390.7 98 80-120 <br /> Nickel 500.0 470.1 94 80-120 <br /> Selenium 1, 000 951.0 95 80-120 <br /> Silver 200.0 193.2 97 80-120 <br /> Thallium 1, 000 953.8 95 80-120 <br /> Vanadium 500.0 491.3 98 80-120 <br /> Zinc 500.0 482.2 96 80-120 <br /> Type: BSD Lab ID: QC346087 <br /> Analyte S iked Result %REC Limits RPD Lim <br /> Antimony 2, UUU - <br /> Arsenic 1, 000 996.0 100 80-120 3 20 <br /> Barium 2, 000 1,945 97 80-120 1 20 <br /> Beryllium 50.00 48.38 97 80-120 1 20 <br /> Cadmium 200.0 208.9 104 80-120 1 20 <br /> Chromium 2, 000 1,962 98 80-120 1 20 <br /> Cobalt 500.0 470.4 94 80-120 3 20 <br /> Copper 250.0 237.8 95 80-120 1 20 <br /> Lead 2, 000 2, 048 102 80-120 2 20 <br /> Molybdenum 400.0 402.8 101 80-120 3 20 <br /> Nickel 500.0 477.8 96 80-120 2 20 <br /> Selenium 1,000 958.3 96 80-120 1 20 <br /> Silver 200.0 194 .8 97 80-120 1 20 <br /> Thallium 1, 000 971.4 97 80-120 2 20 <br /> Vanadium 500.0 493.9 99 80-120 1 20 <br /> Zinc 500.0 481.1 96 80-120 0 20 <br /> RPD= Relative Percent Difference <br /> Page 1 of 1 25.0 <br />