2018-01-17_REVISION - M2009074 - Laserfiche WebLink

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Exhibit D (Cont) Mining Plan 1976 there is little or no topsoil on the site for this area. This pre-law area is outlined on Map Exhibit C. The soils are designated as map units : CaE-Cascajo gravely sandy loam, 5 to 25% slopes, OdA-Oterodry sandy loam, dry, 1 to 4% slopes, OrD-Otero Gravely sandy loam, 3 to 9% slope and RfB- Rocky Ford silty clay loam, 1 to 3% slopes. See the soils map in the NRCS report for how the soils are distributed on the permit area. More detail information including, the soils description and engineering qualities, can be found starting on page 24 in this application. Based on the soils report and on site observations there are sufficient quantities of soil available to reclaim the slope from the original surface to the mine floor or on areas where the growth medium was present when mining started. On the pre-law disturbed lands the area will be graded and graveled so the landowner can use it as they wish. The soils in this area when salvaged and replaced should be capable of growing vegetation consistent with what is there now. The average depth of topsoil on the site according to the NRCS report is 10 to 12 inches deep. Using 10 . 0 inches as the average we calculate there should be a minimum of 11, 300 YD3 of growth medium available for resoiling the slopes around the mine floor. Be assured that enough growth medium will be retained on the site to assure reclamation and revegetation is successful on those areas that have soil on them now. On the old mine area no soil will be replaced since none exists now, rather the area will be graveled to stabilize it . The growth medium stockpiles will be located around the excavation (their approximate locations are shown on the MINING PLAN MAP to reduce the haul distances when reclamation starts . If the soil and overburden stockpiles remain undisturbed for more than one year a cover crop of Western Wheatgrass at a rate of 40 pounds-pls/acre will be planted on them. MINING PLAN We anticipate the life of this mine to be between 10 and 15 years depending on the amount of material in the mine and the market demand. The site is currently used as an existing gravel mine and material storage yard for construction material obtained from other sources besides the mine . The storage area on the old mine floor is used to clean and process the material 8 (REVISED 12/26/17)