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cbCurtis&Tompkins.Ltd. <br /> Batch QC Report <br /> Dissolved Metals Analytical Report <br /> ' Lab #: 227030 Location: DVI-Burn Pit <br /> Client: URS Corporation Prep: METHOD <br /> Project#: DVI-BP Analysis: EPA 6020 <br /> Matrix: Filtrate Batch#: 173768 <br /> Units: ug/L Prepared: 04/14/11 <br /> Diln Fac: 5.000 Analyzed: 04/15/11 <br /> Type: BS Lab ID: QC587685 <br /> Analyte SpikedResult %REC Limits <br /> Arsenic 100.0 96.85 97 78-120 <br /> Barium 100.0 92.75 93 77-120 <br /> Cadmium 100.0 91.25 91 77-120 <br /> Chromium 100.0 93.10 93 79-120 <br /> Copper 100.0 94.20 94 70-120 <br /> Iron 10,000 10,220 102 77-122 <br /> Lead 100.0 93 .60 94 75-120 <br /> Magnesium 10,000 9,285 93 73-120 <br /> Manganese 100.0 92.05 92 79-120 <br /> ' Molybdenum 100.0 92.60 93 72-120 <br /> Nickel 100.0 90.30 90 77-120 <br /> Selenium 100.0 95.90 96 75-121 <br /> Type: BSD Lab ID: QC587686 <br /> Analyte Spiked Result: %REC Limits RPD Lim <br /> Arsenic 100. 0 92 .80 93 78-120 4 21 <br /> Barium 100.0 94. 90 95 77-120 2 20 <br /> Cadmium 100.0 89.15 89 77-120 2 21 <br /> Chromium 100.0 95.85 96 79-120 3 20 <br /> Copper 100.0 95.65 96 70-120 2 31 <br /> Iron 10,000 10,490 105 77-122 3 23 <br /> Lead 100.0 96.45 96 75-120 3 20 <br /> Magnesium 10,000 9,730 97 73-120 5 20 <br /> Manganese 100.0 99..65 100 79-120 8 25 <br /> Molybdenum 100.0 92.95 93 72-120 0 23 <br /> Nickel 100.0 95.90 96 77-120 6 20 <br /> Selenium 100.0 92.40 92 75-121 4 22 <br /> 1 <br /> ' RPD= Relative Percent Difference <br /> Page 1 of 1 <br /> ' 51 of 69 <br />