2021-03-15_REVISION - C1981044 (2)

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o Reclamation Plan Maps 29B and Map 29A Phase II Bond Release For phase II bond release the approved reclamation plans call for. o Specific topsoil replacement depth o Vegetative cover standard o Post-mining land use o Sedimentology estimates. The approved post mining land use for the lands applicable to SL4 is rangeland/wildlife habitat. The reclamation plan and the approved revegetation standards are designed to achieve the approved post mining land use. Vegetation sampling for Phase II and III was conducted simultaneously in the Strip Pit;the Utah Tract, and applicable reference areas. The evaluation was conducted in August 2014 by ESCO Associates,Inc. and August 2015 by Cedar Creek Associates,Inc. The 2014/2015 revegetation success evaluation report for both the Strip Pit and Utah Tract Phase II and III bond release evaluation is included as Attachment D in the SL4 application package. The bond release blocks,reference areas and random sample point locations for each parcel are included on Maps 1 and 2 contained in the evaluation report. Vegetation cover was measured with systematically located transects with an optical point bar using a point-hit technique. A 10-point frame was placed at 10 locations along each 50 meter transect for a total of 100 data points per transect. Transects were randomly located and oriented. For the bond release blocks requested, cover sampling required a minimum of 15 transects or to adequacy as necessary. Noxious weed species may not contribute to the reclamation success. In accordance with Rule 3.03.1(3)(b)and Section III.A.7.a, of the Division's 1995 Guideline Regarding Selected Coal Mine Bond Release Issues,MCM provided Attachment G, Sediment Demonstration, to demonstrate that runoff from the reclaimed parcels will result in equivalent or lesser sediment contributions as compared to baseline conditions at the mine. MCM used the RUSLE (Revised Universal Soil Loss Equation)to compare sediment contribution from bond release parcels and reference areas. The RUSLE provides a basis for predicting the gross erosion per acre from an area on an annual basis. There are three different reclamation/vegetation plans to be considered with the SL4 bond release. The pre law general reclamation plan approved in the permit states that typical soil recovery practices involve recovery and stockpiling of all available A and B soil horizon materials, without segregation. The approved reclamation plan for the Strip Pit pre law area calls for replacement of Permit Number C1981044 Page 10 of 25