2014-03-11_REVISION - M1977208 (2)

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'3� AAcc-max 2. Truck/Vehicle Wash Water in C -Pit and Application to C -Pit Roads. CEMEX currently has a permitted industrial wastewater discharge for truck/vehicle wash water, under Colorado Discharge Permit C00014887. Trucks are washed prior to exiting the CEMEX Lyons Plant as a dust control measure required by the Colorado Department of Public Health and Environment ( CDPHE) Air Quality Control Division. Vendor trucks are filled with the cement product via silos and any potential cement dust from the loading process is washed off the truck from a water spray system. The truck wash water is collected in a basin prior to discharging. The wastewater collection basin serves as an oil -water separator and a settling basin where solids can drop out of the wastewater before the water discharges. The discharged water flows into the Orth ponds and eventually infiltrates into the St. Vrain alluvium. CEMEX has an overall goal to reduce waste production and reduce water use, as part of its sustainability program. As part of this goal, CEMEX would like to eliminate the truck/vehicle wash -water discharge. The volume of vehicle /truck wash water that is discharged is very small. Eliminating this discharge has the following advantages: • Potential water- quality impacts to the Orth Ponds and the Saint Vrain Alluvium could be eliminated reducing the possibility of surface water- quality impacts downgradient of the plant. • Administrative requirements associated with Colorado Discharge permit C00048771 could be eliminated for both CDPHE and CEMEX, for. • Water use would be reduced, by setting up a system that recirculates water for truck/vehicle washing. In lieu of discharging the truck/vehicle wash water, CEMEX would like to containerize or reuse this water and use it to water the roads around C -Pit to control dust. In addition, CEMEX would like to be able to dispose of any excess wash water in C -Pit. C -Pit water is used as process water for cement manufacturing. It is used in the spray tower and is completely consumed in the process (i.e., the cement manufacturing process is a zero- discharge system). Table 4 lists monthly volumes of truck wash water that have been discharged from over the past year and represent approximate volumes of water that would be used for dust control and/or added to C -Pit for use as process water. On average, CEMEX generates approximately 124,565 gallons per month of truck/vehicle wash water. Table 5 summarizes water quality data of the truck wash water that has been collected over the past year. Table 4: Monthly Volume of Truck Wash Water Month Flow Rate (gallons per month) Nov. 2012 104,200 Dec. 2012 32,600 Jan. 2013 39,605 Feb. 2013 733,600 Mar. 2013 79,600 April 2013 82,700 United States Operations P 0 Box 529, Lyons, CO 80540, USA, Phone (303) 823 -2100, Fax (303) 823 -2199