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Minor Revision No. 206 Page 2 <br />January 14, 1997 <br />appropriately completed, but could not accept a factor of safety less than 1.5 and posed five <br />suggestions to address the issue. HLA completed another stability analysis of Profile 3, on the <br />eastern slope of the LRP, as this profile represented the most critical cross-section. This analyses <br />was transmitted to CDMG on November 18, 1996. The perched water table assumed from the <br />previous investigation was further defined using current hydrology modeling techniques to <br />determine a maximum height estimate. Modeling for the perched water table included local <br />climate data and hydraulic conductivity information for the LRP refuse material. An estimate of <br />the height of the perched water table was obtained using the U.S. Army Corps of Engineers <br />"Hydrologic Evaluation of Landfill Performance (11ELP) Model, Version 3, September 1994". <br />The model generated an estimated perched water table r~,aY;rnum height of 5-feet in the upper, <br />newer refuse after 10 years in simulation. The revised stability analyses exceeded the minimum <br />required safety factor of 1.5. MCC received notice that CDMG accepted this analyses on January <br />10, 1997, ar~d thus resolves all outstanding concerns regarding the LRP reconfiguration approved <br />in Tlt#78. <br />All of the above referenced correspondence shall be contained within MCC's files for Technical <br />Revision No. 78. <br />Please call if you have any questions. <br />Christine E. Johnst <br />Permitting Speciali <br />cc: Desty Dyer, Bureau of Land Managment <br />Kathy Welt <br />uN306.dx <br />