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2002 -4- <br />1.0 INTRODUCTION <br />003-2203 <br />Golder Associates Inc. (Golder) has prepazed this report for the Cripple Creek and Victor <br />Gold Mining Company (CC&V) presenting the revised water balance for the Phase IV <br />Valley Leach Facility (VLF). The revised water balance incorporates several recent changes <br />to mine production and processing and replaces the water balance submitted as part of <br />Amendment No. 8 to Permit M-80-244 filed with the OMLR. <br />The revised Phase IV VLF water balance model is the same probabilistic model that was <br />used for Amendment No. 8. The water balance model is an ExcelT"i spreadsheet model that <br />uses internally linked probabilistic softwaze (Crystal Ba11TM) to conduct statistical sampling <br />of site precipitation and evaporation data. As in Amendment No. 8, the available storage <br />capacities of the Phase I, Phase II, and Phase IV Pregnant Solution Storage Areas (PSSAs) <br />and External Storage Pond are compared to the predicted amount of solutions generated <br />within the VLF from normal processing plus 12-hour draindown at the maximum pumping <br />rate (assumes instantaneous draindown), the 100-yeaz, 24-hour design storm event and <br />precipitation based on seasonal variability (95`s percentile). <br />Golder Associates <br />