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Memo <br />To Michael Ellis File no 74201125G <br />From Jay Janney -Moore PE <br />Kim Morrison PE, RG <br />Date October 7, 2011 <br />Subject Lined Storage Capacity under Proposed Fuel Island, Cripple Creek & Victor <br />Gold Mine, Colorado <br />As requested, AMEC has evaluated the storage capacity of the lined storage sump under the proposed <br />fuel island. It is our understanding that the minimum required volume for the sump is 110,000 gallon, <br />which is based on a containment of 110% of the capacity of the largest tank (100,000 gallons). As <br />demonstrated in Table 1 and Figure 1, the fuel storage sump has the minimum required capacity when <br />rock fill used for sump backfill has a porosity greater than 15.2% <br />AMEC Environment & Infrastructure <br />2000 S. Colorado Blvd., Suite 2 -1000 <br />Denver, CO 80222 <br />Tel: +1 (303) 935 -6505 <br />Fax: +1 (303) 935 -6575 <br />Table 1 — Storage Capacity vs. Rock Fill Porosity <br />Rock Fill Porosity <br />16% <br />7. <br />20% <br />30% <br />Storage Capacity (gallons) <br />4" <br />115,725 <br />144,657 <br />216,986 <br />www.amec.com <br />