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Janet Binns <br />August 21, 2013 <br />Page 2 <br />As stated on page 3 of the report, "the Southfield Mine Permanent Closure Map dated <br />August 2001 was used to identify areas and volumes within the mine above and below <br />elevations of interest." This is a key component in each of the Conceptual Models and <br />would require detailed calculations. Please provide a list of assumptions used and <br />an explanation of how the total mine volumes presented in Conceptual Models 1 through <br />3 were calculated. <br />2. The 14 acre -feet per year inflow to the 1 North and 2 North areas is also a key factor in <br />each of the three models. As stated in the report there is no inflow information for the 1 <br />North and 2 North areas for 1998, 1999, or 2000 and previous records are misleading <br />because of use of these areas as reservoirs and pumping from these areas. This critical <br />factor utilized in each model calculation is based solely on observations by EFCI <br />personnel. Please provide a more detailed explanation of the methodology used by EFCI <br />personnel to estimate this mine inflow value and provide the assumptions used in the <br />estimate of 14acre -feet per year. <br />Please let me know if you any questions or need additional information. <br />C: DRMS Denver File <br />