Laserfiche WebLink
surface produced would be dissipated prior to reaching the pile <br />slope. Therefore, no reduction in the stability of the refuse <br />~ pile would result. Design of the refuse pile, including the <br />stability analysis, is presented in the Rocky Mountain Geotechnical <br />report titled, "Reconstruction Plan and Storage Optimization, <br />dated June 14, 1982. A copy of this report is included in <br />Attachment D of the permit application (3/83). In addition, the <br />amount of seepage required to produce this condition would <br />require a storm event in excess of the 100 year-24 hour event <br />(4.4 inches) over the entire area of the pile. Since the <br />extraction of the pillars along the complete length of pile will <br />require less than one year, the likelihood of the 100 year event <br />occurring is extremely low. <br />One other condition which could occur would be the <br />• extraction of the sub-mains prior to the extraction of the main <br />entries (shown in the Mine Plan in Appendix A). This condition <br />could result in the accumulation of water within the pile, due to <br />differential subsidence. Saturated conditions could reach the <br />outside slope of the pile and this induced piezometric level has <br />been calculated to result in factors of safety which approach <br />1.0 (see June 14, 1982 Rocky Mountain Geotechnical Resport). The <br />instability of the refuse pile slope could, therefore, result in <br />diminution of reasonably foreseeable use to the refuse pile (see <br />Reconstruction Plan and .Storage Optimization Report>. <br />Mitigation/prevention measures of this condition are discussed in <br />Section 3.0. <br />Other conditions which could occur, but which would not <br />. result in material damage or diminution of reasonably foreseeable <br />20 <br />