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(1.5 feet) material will be replaced on all reclaimed areas, followed by re- seeding with the Rangeland Seed Mixture <br />(Table 55). Reclaimed areas will be managed in the same way as other reclamation, with regular inspections and <br />maintenance to identify and control any excessive erosion, and spraying, as necessary, consistent with the approved <br />Weed Management Plan to control noxious weeds. <br />TCC's bond reclamation cost estimate for the CRDA Expansion takes into account the consideration that bond <br />monies have already been posted for the existing Refuse Pile, which includes the entire eastern side (approximately <br />40 acres) that will be redisturbed by the proposed CRDA Expansion. This existing bond (amount corresponding to <br />acres to be redisturbed is approximately $360K), along with the calculated bond coverage for a 50 acre area <br />(approximately $380K), addresses bonding for the initial area of disturbance, as shown on Drawing C -102 in <br />Exhibit 26C. This initial bonded area includes redisturbance of the eastern side of the existing RDA <br />(approximately 40 acres), the initial CRDA bonded disturbance area (approximately 30.3 acres), haulroad <br />disturbance (approximately 2.4 acres), stockpile and ditch disturbance (approximately 9.4 acres), stockpile access <br />corridors (0.4 acres), and a bonded buffer of approximately 7.5 acres to address any minor unplanned disturbances. <br />With a total facility life of approximately 14 to 20 years, it is anticipated that the remaining 50 acres of the total <br />CRDA expansion area of 140 acres will be bonded in two future bond increments of approximately 20 -30 acres <br />each (each increment will be approximately $150K - $230K, depending on size). Bond Increment I was addressed <br />in 2013, and Bond Increment II is anticipated to occur in the 2017 -2021 time- frame. Consistent with the <br />constraints inherent in a cumulative bonding approach, TCC will clearly delineate bonded areas, will limit <br />disturbance to those areas, and will work with the CDRMS to determine and maintain adequate bond coverage for <br />all activities. <br />Concerning the Fish Creek Tipple, no excess spoil or underground development waste will be generated in connection <br />with the operation. Thus, the requirements of this section and Rule 4.09 are not applicable. <br />(9) Return of Coal Mine Waste to Abandoned Workings <br />(a) Each plan shall describe the design, operation and maintenance of any proposed coal <br />processing mine waste disposal facility, including flow diagrams and any other necessary drawings and maps. which <br />must meet the standards of 2.1 O, for the approval of both the Division and the Mine Safety and Health Administration <br />in accordance with 4.11.3. <br />(b) Each plan shall describe the source and quality of waste to be stored, area to be backtilled. <br />percent of the mine void to be filled, method of constructing underground retaining walls influence of the bacldillinLg <br />operation on active underground mine operations, surface area to be supported by the backfill, and the anticipated <br />Occurrence of surface effects following backfilling <br />(c) The applicant shall describe the source of hydraulic transport medium. method of dewater111 <br />the placed backfill. retainment of water underground, treatment of water if released to surface streams, and the effect on <br />the hydrologic regime. <br />(d) The plan shall describe each permanent monitoring well to be located in the bac]JIlled <br />area. the stratum underlvin, the mined coal, and gradient from the backfilled area <br />(e) The requirements of 2.05.3 shall also apply to pneumatic backfilling operations. except <br />\\ here the operations are exempted by the Division from requirements specifying hydrologic monitoring. <br />RESPONSE <br />TC returns the thickener underflow generated at both Washplants I and II to the abandoned and sealed underground <br />mine workings. When Washplant I initially began operations, the thickener underflow was partially dewatered <br />using a filter- press, and this material was then combined with the coarse refuse and hauled to the Refuse Pile for <br />placement. Due to handling and placement problems, TC modified the fine refuse handling method, and began <br />pumping the thickener underflow into the abandoned mine workings in the Eastern Mining District (EMD), as <br />opposed to mixing it with the coarse refuse for placement on the Refuse Pile. <br />MR13 -273 2.05 -97.6 12/06/13 <br />