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Paragon Ana <br />METALS CASE NARRATIVE <br />CEMEX, Inc. <br />A + C Pits <br />Order Number - 0507276 <br />1. <br />i3 <br />I <br />~ 4. <br />5. <br />I <br />This report consists of 2 water samples. P <br />The samples were received cool and intact on 07/29/05. <br />The samples were to be analyzed for dissolved metals. The samples shad 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 />The samples were prepared 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 prepared following method 200.2 and <br />PA SOP 806 Rev. 11. The samples were not digested prior to analysis. <br />The samples were prepazed 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 />The samples were analyzed following Methods for the Determination of Metals in <br />Envuonmenta] Samples -Supplement 1 procedures. <br />Analysis by ICP-MS followed method 200.8 and PA SOP 827 Rev. 3. <br />The relationship between intensity and concentration for each element is <br />established using at least four standards, one of which is a blankjsolution. 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-linear. <br />During sample analysis concentrations are 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 2nd source standazd solution with concentration's near the <br />