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4 Recommendations <br />Prior to implementing either Option 1 or 2, it is recommended that CEMEX prepare a <br />detailed design for the implemented option, as necessary, to develop the specific <br />equipment and material needs and the pumping and additive application rate required for <br />efficient and effective treatment. A full chemical analysis of the C-Pit water for major <br />cations and anions, pH, and total alkalinity (including the titration curve) is also <br />recommended to determine the amount of additive necessary to adjust the pH to <br />approximately 8. It is suggested that an analysis of the sodium bisulfate is also <br />performed prior to use so that trace constituents that may be present in the chemical <br />additive, and are regulated in ground or surface waters, are not introduced into the C-Pit <br />water. It is also recommended that a laboratory bench-scale treatability evaluation be <br />performed prior to finalizing the selection of either carbon dioxide or sodium bisulfate as <br />an amendment to determine its application rate and effectiveness in adjusting pH. <br />CEMEX Water Treatment Plan $ Revision 0 <br />