2011-06-30_REVISION - M2002004 (82)

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GCC Rio Grande, Inc. — Pueblo Cement Plant and Limestone Quarry Exhibit E Erosion Blankets A variety of erosion blankets and geoxtextiles are available in the market place that may be used to protect the soil surface during the establishment of vegetation or provide subsurface soil stability to reinforce rooting zones for vegetation liners required in surface water runoff structure designs. Blankets and turf reinforcement products will be selected and applied per manufacturer's recommendations and instructions for the areas in which they are used. REVEGETATION PLAN The primary goal of the revegetation plan is to establish plant covers best suited for one of four distinct purposes. The four main types of vegetation cover that may be established at Mine include: • Temporary -Used on areas disturbed by mining and reclamation activities that will be subsequently re- disturbed to support ongoing activities; • Cover Crop -Used on reclaimed topdressed areas that will act as a green manure /mulch crop; • Stabilization -Used in an area that is prone or more susceptible to erosion (i.e., diversions, channel bottoms, sediment pond spillways, etc.) • Permanent Rangeland -Used on permanently reclaimed lands to establish a diverse, permanent, native rangeland plant community capable of supporting the designated post- mining land use of rangeland, while providing ground cover that promotes soil stability and reduces soil erosion. Plant species may be used singly or in a variety of combinations to establish vegetation cover best suited for the intended purpose or needs of a given disturbed site. Typical uses of these seed mixtures and plant species that will be considered for use in them are presented below. Seed Mixture Species Selection Native and introduced plant species may be used in the various seed mixtures. A list of plant species suited to the mine site is provided in Table 1 GCC Rio Grande Pueblo Limestone Mine Potential Reclamation Species Included is a summary of key plant attributes and characteristics that make these plant species useful for reclamation at the Mine. Plant species use and relative composition in a seed mixture may vary from year to year as described below for each seed mixture type. Plant species that may be used in establishing plant cover have been selected from the following information: • The site's baseline vegetation survey, • NRCS Range Site descriptions for the site and adjacent undisturbed areas, • Personal experience gained reclaiming drastically disturbed lands, • Plant materials suppliers, and • Mined land reclamation literature. • Plant species listed in Table 1 are commercially available. This list may be modified as commercial availability of plant materials changes over time. Native plant species will be preferentially used in the formulation of seed mixtures. Introduced and developed species will be used in those instances when they are best suited for the intended use. Seed mixtures will be formulated to address the specific site and use for which they are intended as described below. Revised June 29, 2011 E -7 Exhibit E — Reclamation Plan