Laserfiche WebLink
• 3.0 FACILITIES LAYOUT AND DESIGN <br />The facilities layout is shown in plan view on Drawing 1 and in cross-sectional view on <br />Drawing 2. The following design criteria and assumptions were considered in the design of the <br />proposed spray evaporation system. <br />• Minimize additional distwbance by utilizing existing disturbed azeas (West Pit) <br />• Balanced cut and fill construction within the West Pit <br />• Provide for swge capacity using aholding/collection pond <br />• Maximize liner swface azea outside of the pond for spray and radiant evaporation <br />• Inflow into the enhanced evaporation system from the West Pit backfill pumping <br />wells} assumed to be temporarily 200-350 gpm. <br />3.1 Water Balance -Operations <br />The current ground water elevation in [he reclaimed West Pit area is approximately 8,595 feet. <br />. The goal of the proposed evaporation system is to remove enough water through evaporation to <br />lower the elevation of the ground water in the reclaimed West Pit azea approximately 15 feet <br />(elevation 8,580). Fifteen feet of backfill contains approximately 33 million gallons of water <br />(BMI2I, 1999). During pumping, the current groundwater inflow conditions into the West Pit <br />would result in collection of an additional l l million gallons; thus totaling approximately <br />44 million gallons of water removal required to lower the water level by 15 feet. <br />Water balance modeling was conducted using the STELLA® model. STELLA® is a <br />commercially available "dynamic systems model" designed to simulate time-dependent systems. <br />STELLA® provides basic model elements that are used to construct a representation of the <br />physical system. Additionally, STELLA® solves the system of mathematical expressions that <br />aze used to describe the time-dependent physical processes. <br />Figure 3-1 presents a flow diagram schematic of the enhanced evaporation system model <br />developed using the STELLA® soflwaze package. Tabulated results of the water balance aze <br />presented in Appendix A. Time dependent volumes of spray evaporation are shown in <br />Figwe 3-2. The water balance projections indicate that approximately 88 days are required to <br />Bat!le Mountain Resources, lnc. ~RAFI' Shepherd h!i!(er. lnc. <br />p:i/OeS6~ewpporx4Hrpun.Ja 3-1 May 1l, 1999 <br />