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I <br />• • <br />(l,) <br />V. Stability of Post Mining Sloes - Due to the interest <br />expressed by the present surface owner to maxmize the grazing, <br />potential and enhance the value of the present mine area after <br />reclamation, CWI will seek the approval of the appropriate <br />regulatory agency to leave cut and fill terraces pursuane to <br />Section 717.14 (b) and to permanently preserve the upper drainage <br />control structures. If this permission cannot be obtained Cl•lI <br />will backfill and grade all benches to the original contour irk <br />conformance with Section 717.14. <br />The mining plan contained a detailed topographic map showing <br />the affected area and a narrative description of reclamation and <br />restoration actions to be undertaken by CWI. To satisfy EPA's <br />request for additional detail we are submitting our previously <br />prepared maps showing post-mining affected area. These maps <br />are attached and identified as Plates 1, 2, and 3. <br />Subsection 4.4a3.3. of the mining plan describes CWI's <br />final reclamation and abandonment program. The detailed backup <br />information submitted with this memorandum is intended to satisfy <br />EPA's request for additional detail and our backup studies. <br />Concerning the EPA question about post-mining slope stability, <br />there are areas which are a part of the active mining operation <br />now that do have slopes in excess of the original slopes in the <br />area. And in certain places, those slopes do exceed 1:1; however, <br />stability analysis by reputable soil mechanics consultants have <br />shown that the cut slopes are stable and safe from any potential <br />mass movement. CWI recognizes, however, that local problems <br />may develop near the crest areas of the fill slopes and thes' <br />local problems will he corrected through the regular aint'en ice ' <br />i~ <br />of the mine . ~~'~' '~~;~ ~;~ ~~~~I, ~I~~L ~I~~ ~~, <br />~. <br />~I <br />_l <br />~~ <br />