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0 ARCADIS <br />Mr. Timm Comer <br />Manager, Environmental Resources <br />Cripple Creek & Victor Gold Mining Company <br />P.O. Box 191 <br />100 North 3rd Street <br />Victor, Colorado 80860 <br />RE: Mine Life Extension 2 Carrying Capacity <br />Dear Mr. Comer: <br />This letter is submitted in response to a request made by Cripple Creek & Victor <br />Mining Company (CC &V) for ARCADIS U.S., Inc (ARCADIS) to determine rangeland <br />carrying capacity for lands within the Cresson Project Mine Life Extension 2 Project <br />Area in Teller County, Colorado. The Project Area encompasses approximately 420 <br />acres as defined in the ARCADIS Baseline Technical Report for Soils and Biological <br />Resources dated October 2011. <br />Baseline evaluation of the Project Area identified the extents of seven soil map units. <br />National Resources Conservation Service (NRCS) soil survey data for Teller County <br />provides estimates of range vegetative productivity for normal growing years in terms <br />of pounds per acre of air -dry vegetation for all soil units within the Project Area, <br />except unit Sz (Seitz very gravelly loam, 20 to 50 percent slopes). Vegetative <br />productivity for this soil map unit is assumed to be similar to soil map unit RgR <br />(Rogert-Rock outcrop complex, 20 to 60 percent slopes) based on field observations <br />of similar soil characteristics and vegetation communities. <br />Based on NRCS productivity estimates, a range proper use factor of 50 percent, <br />grazing efficiency of 50 percent and an Animal Unit Month (AUM) requirement of 900 <br />pounds of forage per AUM, the total number of acres per AUM for each soil map unit <br />are as follows: CQ — 1.8 acres per AUM; EB — 4.0 acres per AUM; Rg and RI — 5.2 <br />acres per AUM; and RgR and Sz — 7.8 acres per AUM. <br />If you have any questions regarding the carrying capacity estimates provided herein, <br />please contact me at 303 - 471 -3438. <br />Sincerely, <br />� --A YC(:T <br />ARCADIS U.S., Inc. <br />Jerry H. Koblitz <br />Senior Vice President <br />ARCADIS U.S., Inc. <br />4999 Pearl East Circle <br />Suite 200 <br />Boulder <br />Colorado 80301 -2654 <br />Tel 303 544 0043 <br />Fax 303 544 0059 <br />www.arcadis - us.com <br />ENVIRONMENTAL PLANNING <br />Date: <br />February 1, 2012 <br />Contact: <br />Jerry H. Koblitz <br />Phone: <br />303 - 471 -3438 <br />Email: <br />jerry.koblitz@arcadis-us.com <br />Our ref: <br />C0001523.0002.00001 <br />Page: <br />1/1 <br />