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May 28, 2002 -6- 003-2203 <br />2.1 Water Balance Inflows <br />There are three basic solution inflow components to the VLF: (1) fluid applied as barren <br />solution, (2) direct precipitation falling onto the lined azeas of the VLF, and (3) moisture <br />contained in the matrix of the ore as it is delivered to the VLF. During operations, CC&V is <br />planning to apply barren solution to ore within the VLF according to the schedule presented <br />in Appendix A. The solution application schedule was provided to Golder by CC&V. <br />Monthly precipitation was modeled using statistical historic climatological data <br />(EarthInfo 1990) and recent site climatological data recorded by CC&V and provided to <br />Golder. Data used for precipitation and evaporation distributions aze summarized in <br />Appendix B. The amount of precipitation that is statistically predicted to fall on a monthly <br />basis is multiplied by the lined azea to quantify the monthly precipitation inflow into the <br />VLF. <br />Data provided by CC&V indicates that the moisture content of the ore delivered to the VLF <br />will average 5.6 percent by dry weight, as presented in Amendment No. 8 and as reproduced <br />in Appendix C. The average moisture content of the delivered ore was multiplied by the dry <br />tons of ore delivered monthly to the VLF to quantify the moisture delivered to the VLF. The <br />anticipated ore-loading schedule for the VLF is presented in Appendix A. Ore tonnage is <br />based on an average ore unit of 95.2 pounds per cubic foot (pcf), consistent with Amendment <br />No. 8. <br />2.2 Water Balance Outflow <br />Solution outflow components from the VLF include evaporative losses and the difference in <br />ore moisture between as-delivered moisture content and field capacity (moisture take-up). <br />Evaporative losses were modeled using historic climatological data collected at <br />representative locations throughout the state. While there are insufficient data to generate <br />statistical parameters from the site data, these values were compazed to the statistical data <br />Golder Associates <br />