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Paragon Analytics METALS CASE NARRATIVE CEMEX, Inc. Order Number - 0612084 1. This report consists of 1 water sample. 2. The sample was received cool and intact on 12/13/06. 3. The sample was to be analyzed for dissolved metals. The sample was filtered through a 0.45 micron filter and preserved with nitric acid to a pH less than two prior to analysis. 4. The sample was prepazed for analysis based on Methods for the Determination of Metals in Environmental Samples -Supplement 1 procedures. For analysis by ICP-MS, the sample was digested following method 200.2 and PA SOP 806 Rev. 12. The sample was prepazed for ICP-MS analysis of selenium by passing the sample and associated QC through a cation exchange column. The cation exchange column removes cations from the matrix and eliminates interferences. 5. The sample was analyzed following Methods for the Determination of Metals in Environmental Samples -Supplement 1 procedures. Analysis by ICP-MS followed method 200.8 and PA SOP 827 Rev. 5. The relationship between intensity and concentration for each element is established using at least four standazds, one of which is a blank solution. A calibration equation relating instrument response to concentration is developed by the instrument software. The equation is a higher order polynomial. This type of equation is used to improve quantitation accuracy at lower concentrations where the relationship between concentration and instrument response is non-linear. During sample analysis concentrations aze computed by the softwaze and the results are printed in ug/I.. The validity of the cahbration equation is tested by analyzing the following solutions: a blank, a low level check solution with concentrations neaz the reporting limit, an Initial Calibration Verification (ICV) standard from a 2nd source standazd solution with concentrations neaz the