2018-02-08_PERMIT FILE - C2010089 (2)

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implemented (please see Temporary Seed Mixture section below). At times, the size or shape of the retopsoiled areas and shape of the reclaimed area in relation to a management unit may be insufficient to warrant establishment of the perennial Irrigated Pasture/Cropland species initially. When this occurs, and the period before establishment of permanent Irrigated Pasture/Cropland will extend beyond a year, a temporary seed mixture will be used (please see Temporary Seed Mixture section below). This mix will provide interim stabilization as well as organic matter benefits when incorporated during tillage and seedbed preparation prior to seeding of the Irrigated Pasture/Cropland seed mixes. 2.3 Seed Mixture At the request of the surface landowner the seed mix that will be planted on the Irrigated Pasture/Cropland is as follows: Seed Mix #5 - Irrigated Pasture/Cropland Species Scientific Name Common Name PLS/Acre Medicago Sativa Alfalfa 18 Total 18 Note: Alfalfa seed must be inoculated with a specific strain of Rhizobium bacteria. 70 lbs/acre of oats may be planted as a first year cover crop if necessary. 2.4 Irrigation Designs Areas that are to be reclaimed as Irrigated Pasture/Cropland will be irrigated using sprinkler irrigation. Map 2.05.5-1: Postmining Land Use shows all areas to be reclaimed as Irrigated Pasture/Cropland. The calculations for irrigation systems are shown in Attachment 2.05.4(2)(e)-1. These calculations were made using the irrigation design worksheets from the Colorado Irrigation Guide and the NRCS National Engineering Handbook Section 15, Chapter 11. The extent of irrigation will be based on the amount of shares that are available to them from the Colorado Cooperative Company (CCC Ditch) for the reclaimed areas. The designs are based on the NRCS calculations with accounting for 6 days out of 7 days for operating the system, allowing one day off for rest, unforeseen issues, system maintenance, family commitments, etc. 2.5 Pasture Management Irrigated Pasture/Cropland should be able to attain a good level of productivity with the seed mix referenced above under continuing and adequate management inputs. This includes scheduled irrigation, fertilization and grazing management or proper harvest methods. Annual fertilization of Irrigated Pasture/Cropland is a typical management practice to maintain plant vigor and Section 2.05.4(2)(e) Page 4 of 14 January 2018 (PR -02)