2003-08-20_REVISION - M1977344 - Laserfiche WebLink

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Under your plan for topsoiling you state "topsoil will be recovered and hauled to designated topsoil stockpile azeas.... where it is stockpiled and then seeded with quick growth grasses for the prevention of erosion." Provide the seed mix (species) and seeding rate (lbs. PLS per acre) for the quick growth grasses. Your plan includes spreading topsoil at a thickness of 0-6 inches. If the range is 0-6 inches, Holcim would have the option of replacing 0 inches of topsoil on reclamation azeas. Please state a range of topsoil replacement that is appropriate for the range of topsoil salvage potential in accordance with the soils information in your Exhibit I -Soils Information. All areas should receive some topsoil replacement to insure that it will be possible to reclaim them to rangeland. If you have identified azeas where there is no topsoil, provide your plans for use of another plant growth medium, including how it will be amended if necessary to insure successful establishment of the planned rangeland species. Your reclamation plan includes a proposed seeding mix taken from a form CO-ECS-S prepazed by Roy Roper on August 22, 2000. Mr, Roper is a highly respected conservation planner in the Fremont County area and, his seeding recommendations are usually very good. Upon closer examination of the CO-ECS-S form, it is apparent that the seed mix was prepazed for a two acre limestone breaks site or mine spoil (limestone outcrop or limestone rubble). The mine reclamation plan includes replacing topsoil, which in the mine area is primarily of silt loam and silt clay loam textures. The native vegetation is primarily Blue Grammy grass and Westem Wheatgrass. Sand Dropseed and Fourwing Salt Bush are also components of the native vegetation. The grass Mammoth Wildrye in the proposed seed mix is not well suited to the site. It is used for dune stabilization in the northwest United States. The Division will require that Blue Grama grass and Western Wheatgrass be included as major components of the seed mix. The Division suggests that Holcim consider using the following mix or a very similaz mix. Specie % of mix PLS/Ac (broadcast) Blue Gramma grass 30% 1.8 Lbs PLS Westem Wheatgrass 20 6.4 Sideoats Gramma 10 1.9 Crested Wheatgrass 10 2.0 Indian Ricegrass 10 2.5 Alkali Sacaton 10 0.3 Sand Dropseed 5 0.1 Fourwing Saltbush 5 1.0 If Holcim does not agree to use this seed mix provide a new proposed mix that includes a large component of Blue Gramma grass and Western Wheatgrass.