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Cripple Creek & Victor Gold Mining Company Squaw Gulch Valley Leach Facility Design <br />2.0 SITE DESCRIPTION <br />2.1 Location and Topography <br />2.2 Climate <br />The existing Cresson Project VLF is located in Teller County, Colorado. Squaw Gulch <br />VLF will mostly lie within the Squaw /Anaconda and Swede Gulch areas, located <br />between Raven and Gold Hill, as shown on Drawing A20. <br />Portions of the Squaw Gulch VLF area have been approved for disturbance due to <br />previous mining activity. Manmade structures within /near the footprint of the proposed <br />project site include power lines, other utilities, underground mine workings, and <br />surface mine workings, as shown in Drawing A60. All vegetative cover, organic soils, <br />and structural materials associated with the manmade structures will be removed or <br />relocated prior to /or during subgrade preparation. <br />Original climate data for the project site were documented in Amendment No. 6 to <br />Permit M- 1980 -244 (CC &V 1993a). These data have since been augmented with <br />available site data collected by CC &V. In addition, gaps within the climate data have <br />been filled using climate records from the Western Regional Climate Center (WRCC), <br />as detailed in Appendix G.2. <br />As part of this design, AMEC combined and incorporated the climate data to develop a <br />consistent precipitation database that spans from 1966 through 2010. The <br />precipitation data for each month are presented in Appendix G. The monthly average <br />and standard deviation precipitation values were then recomputed incorporating all of <br />the precipitation data summarized in Table 1. The average yearly precipitation, <br />including snowfall, is 18.9 inches. <br />The 100 - year /24 -hour design storm event was quantified as 3.5 inches from the 1973 <br />NOAA isopluvial chart. This 3.5 -inch value was mutually agreed upon by the OMLR <br />and CC &V during review of Amendment No. 7 to Permit M- 1980 -244. <br />At the time Amendment No. 6 was prepared, evaporation data were not available for <br />the Victor or Cripple Creek stations. Therefore, a statistical analysis of pan <br />evaporation data collected at nine similar high - elevation recording stations in the state <br />of Colorado was performed. This analysis resulted in an average annual lake <br />evaporation of 36.8 inches. Since Amendment No. 6, evaporation data have been <br />collected by CC &V from August 1994 to November 1999. The daily evaporation data <br />provided by CC &V are presented in Appendix G. The average monthly evaporation <br />data measured by CC &V from August 1994 through November 1999 are summarized <br />in Table 2. These evaporation data were used to represent the Cresson Project, and <br />were used to develop a monthly evaporation loss distribution. This was completed by <br />dividing the monthly lake evaporation by the average annual lake evaporation, and <br />multiplying this factor by a 2 percent solution application loss during operations. The <br />Project No.: 74201125G0 Page 9 <br />1 September 2011 <br />amec0 <br />