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FxH - s <br /> Source of Reclamation Material,Roadfill,and Topsoil—Weld County,Colorado,Northern Part <br /> Source of Reclamation Material, Roadfill, and Topsoil <br /> This table gives information about the soils as potential sources of reclamation <br /> material, roadfill, and topsoil. Normal compaction, minor processing,and other <br /> standard construction practices are assumed. <br /> The soils are rated good, fair, or poor as potential sources of reclamation <br /> material, roadfill, and topsoil.The features that limit the soils as sources of these <br /> materials are specified in the table. Numerical ratings between 0.00 and 0.99 are <br /> given after the specified features. These numbers indicate the degree to which <br /> the features limit the soils as sources of topsoil, reclamation material, or roadfill. <br /> The lower the number, the greater the limitation. <br /> Reclamation material is used in areas that have been drastically disturbed by <br /> surface mining or similar activities.When these areas are reclaimed, layers of <br /> soil material or unconsolidated geological material, or both, are replaced in a <br /> vertical sequence. The reconstructed soil favors plant growth.The ratings in the <br /> table do not apply to quarries and other mined areas that require an offsite <br /> source of reconstruction material.The ratings are based on the soil properties <br /> that affect erosion and stability of the surface and the productive potential of the <br /> reconstructed soil. These properties include the content of sodium, salts, and <br /> calcium carbonate; reaction; available water capacity; erodibility; texture; content <br /> of rock fragments; and content of organic matter and other features that affect <br /> fertility. <br /> Roadfill is soil material that is excavated in one place and used in road <br /> embankments in another place. In this table, the soils are rated as a source of <br /> roadfill for low embankments, generally less than 6 feet high and less exacting in <br /> design than higher embankments.The ratings are for the whole soil, from the <br /> surface to a depth of about 5 feet. It is assumed that soil layers will be mixed <br /> when the soil material is excavated and spread. <br /> The ratings are based on the amount of suitable material and on soil properties <br /> that affect the ease of excavation and the performance of the material after it is in <br /> place. The thickness of the suitable material is a major consideration. The ease <br /> of excavation is affected by large stones, depth to a water table, and slope. How <br /> well the soil performs in place after it has been compacted and drained is <br /> determined by its strength (as inferred from the AASHTO classification of the soil) <br /> and linear extensibility(shrink-swell potential). <br /> Topsoil is used to cover an area so that vegetation can be established and <br /> maintained.The upper 40 inches of a soil is evaluated for use as topsoil.Also <br /> evaluated is the reclamation potential of the borrow area.The ratings are based <br /> on the soil properties that affect plant growth; the ease of excavating, loading, <br /> and spreading the material; and reclamation of the borrow area. Toxic <br /> substances, soil reaction, and the properties that are inferred from soil texture, <br /> such as available water capacity and fertility, affect plant growth. The ease of <br /> excavating,loading, and spreading is affected by rock fragments, slope, depth to <br /> a water table, soil texture,and thickness of suitable material. Reclamation of the <br /> borrow area is affected by slope, depth to a water table, rock fragments, depth to <br /> bedrock or a cemented pan, and toxic material. <br /> USDA Natural Resources Web Soil Survey 9/24/2019 <br /> '� Conservation Service National Cooperative Soil Survey Page 1 of 3 <br />