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the labTreat system as well as a material safety data sheet (MSDS) for carbon dioxide is <br />provided in Appendix B. Should the need arise to implement Option 1, CEMEX reserves <br />the right to procure the equipment and materials for a similar treatment system through <br />competitive bid. <br />3.2 Option 2 - pH Adjustment Using Sodium Bisulfate <br />Option 2 is developed to treat the residual C-Pit water that may remain after CEMEX has <br />reduced the pond to its smallest practical volume by December 1, 2005. CEMEX <br />estimates that the volume may be as small as 325,000 gallons. Treatment of this small <br />volume of water will require significantly less equipment and materials and a much <br />simpler system than Option 1. The selected amendment for Option 2 is sodium bisulfate. <br />Sodium bisulfate is known in the industry as "dry acid" and, similar to carbon dioxide, <br />minimizes the need to store and handle liquid acids, thus reducing worker health and <br />safety concerns. Sodium bisulfate is classified as nonhazardous by the Department of <br />Transportation (DOT) and an irritant by the Occupational Safety and Health <br />Administration (OSHA). <br />The chemical process that occurs using sodium bisulfate to reduce the pH of alkaline <br />water involves the dissolution of sodium bisulfate (NaHSOa) in water to form sodium <br />(Na`~, hydrogen (H'), and sulfate (SOa) ions. The H' ions reduce the waters'pH, The <br />reaction mechanism for sodium bisulfate dissolution in water is shown below. <br />NaHSOa -~ Na' + H' + SOa <br />The conceptual design for Option 2 consists of single mixing tank outfitted with a sodium <br />bisulfate dispenser and an automated pH monitor. Approximately five tons of sodium <br />bisulfate will be required for treatment. Residual water from the C-Pit will be pumped <br />into the tank, mixed with sodium bisulfate, and returned to the pond or used for plant <br />operations. The pumping and mixing process will be maintained until the pH of the <br />residual C-Pit water has been adjusted to a pH of approximately 8. An automated pH <br />probe will be used to monitor the treated water so that an approximate pH of 8 is attained. <br />The capital and operating costs to implement Option 2 is estimated at approximately <br />$10,000. Information concerning technical-grade sodium bisulfate, including a MSDS, is <br />provided in Appendix C. Should the need arise to implement Option 2, CEMEX reserves <br />the right to procure the equipment and materials through competitive bid. <br />CEMEX Water Treatment Plan '] Revision 0 <br />