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• <br />Tuttle & Associates, Inc. <br />December 5, 2011 <br />Page 2 of 2 <br />c. A conservative depth to ground water of 4 feet below the ground surface during mining was used <br />in the model as a result of drawdown due to dewatering to the top of the weathered bedrock <br />(approximately 38 feet below existing grade). <br />Due to the conservative material properties and the very conservative groundwater assumptions Lyman Henn <br />considers a minimum factor of safety appropriate for the proposed mining at the project site. <br />ivlemu- Pueblo East Am -01 Adequacy Letter rev 12-5-11 <br />