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Paragon Analytics <br />METALS CASE NARRATIVE <br />CEMEX, Inc. <br />A and C Pit <br />Order Number - 0609227 <br />1. This report consists of 2 water samples. <br />2. The samples were received cool and intact on 09/29/06. <br />3. The samples were to be analyzed for dissolved metals. The samples had not been <br />filtered and preserved prior to receipt. The samples were filtered through a 0.45 <br />micron filter and preserved with nitric acid to a pH less than two prior to analysis. <br />4. The samples were prepazed for analysis based on Methods for the Determination <br />of Metals in Environmental Samples -Supplement 1 procedures. <br />For analysis by ICP-MS, the samples were prepazed following method 200.8 and <br />PA SOP 806 Rev. 12. The samples were not digested prior to analysis. <br />The samples were prepared for ICP-MS analysis of selenium bypassing the <br />samples and associated QC through a cation exchange column. The cation <br />exchange column removes cations from the matrix and eliminates interferences. <br />5. The samples were analyzed following Methods for the Determination of Metals in <br />Environmental Samples -Supplement 1 procedures. <br />Analysis by ICP-MS followed method 200.8 and PA SOP 827 Rev. 4. <br />The relationship between intensity and concentration for each element is <br />established using at least four standazds, one of which is a blank solution. A <br />calibration equation relating instrument response to concentration is developed <br />by the instrument softwaze. The equation is a higher order polynomial. This <br />type of equation is used to improve quantitation accuracy at lower <br />concentrations where the relationship between concentration and instrument <br />response is non-lineaz. <br />During sample analysis concentrations aze computed by the softwaze and the <br />results are printed in ug/L. The validity of the calibration equation is tested by <br />analyzing the following solutions: a blank, a low level check solution with <br />concentrations near the reporting limit, an Initial Calibration Verification (ICV) <br />standazd from a 2"d source standazd solution with concentrations near the <br />