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C-SHADRIFS91.6/G WPP.11 <br /> 01/22/92 <br /> of treated groundwater (from the North and South Balloon and Central Area <br /> treatment systems) is to surface water. Disposal through reuse and a pond with <br /> connector wells are not capable of accepting the total final volume of treated <br /> groundwater. However, reuse and recycling of the treated groundwater is <br /> preferable because of the benefits to the water resource. Therefore, disposal to <br /> surface water will be minimized. SHARPE is committed to the productive <br /> reuse/recycling of the treated groundwater. <br /> POTENTIAL NEED FOR ADDITIONAL TREATMENT IN THE CENTRAL AREA <br /> Because of the nature of groundwater contamination in the Central Area, <br /> additional treatment may be required to remove arsenic to levels acceptable for <br /> groundwater disposal. Two treatment alternatives have been proposed. <br /> Optional Component A, activated alumina, involves pumping contaminated <br /> groundwater through a bed of activated alumina which is capable of removing <br /> arsenic from groundwater through adsorption. This alternative has an estimated <br /> present-worth cost of$2,529,000. Optional Component A consists of the <br /> treatments to remove arsenic to acceptable levels and would follow one of the <br /> VOC removal alternatives (Alternatives 1 through 4). The major components <br /> include: <br /> Sulfuric acid and lime feed systems for pH control, <br /> Three 12- by 9-ft-diameter contactor vessels, <br /> Backwash tank and pumps, and <br /> Piping treated water to disposal network. <br /> Optional Component B, coprecipitation with ferric (iron) chloride, is a process <br /> whereby arsenic is removed from groundwater by adsorbing on precipitated iron <br /> particles. This alternative has an estimated present-worth cost of $1,817,000. <br /> 14 <br />