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• Current literature show that 6 to 15 inches of topsoil underlain with chemically and <br /> physically suitable spoil material will be sufficient to: 1) establish a proper seedbed <br /> and rooting medium, and 2) achieve a compatible relationship between production, <br /> diversity, and plant community composition. A topsoil resource quality control program <br /> will remain in effect over this five year permit term to: 1) ensure that topsoil is <br /> salvaged and replaced as recommended, 2) evaluate topsoil and spoil handling procedures, <br /> and 3) monitor long-term revegetation success. An annual Topsoil Balance/Spoil Quality <br /> Report will be completed and submitted to CMLRD by April 15 of each year through the <br /> life-of-mine operation. <br /> Nucla East Topsoil Management Plan <br /> The Nucla East topsoil management plan, based predominantly upon the detailed soil survey <br /> contained in Tab 9 and secondarily on historic reclamation at Nucla Mine, was developed to <br /> insure that the most suitable topsoil within the disturbance area is salvaged. The <br /> management plan evaluates the topsoil resources and describes salvage depths and <br /> techniques, storage, redistribution, and maintenance or testing procedures necessary to <br /> • restore the disturbed areas to the desired postmine land use including 15.0 acres of prime <br /> farmland. <br /> Evaluation of Topsoil Resources. The soils found in the Nucla East permit area are <br /> typical of soils found in the semi-arid Colorado Plateau Physiographic Province, Canyon <br /> Land Section.. The soils within the Nucla East disturbance area support either <br /> pastureland, hayland, or wildlife habitat premine land uses. Hayland soils are <br /> predominantly moderately deep (20 to 40 inches) to deep (40 to 60 inches) and have <br /> developed in local alluvium and slopewash colluvium. Most of the hayland soils are <br /> Ustollic Haplargids. The pastureland soils are typically shallow (10 to 20 inches) and <br /> have developed in residuum from sandstone. The pastureland soils are Lithic Ustollic <br /> Calciorthids and Lithic Ustic Torriorthents. Also found in the study area are Lithic <br /> Haplaquolls and Typic Haplaquolls. These somewhat poorly to poorly drained soils provide <br /> wildlife habitat and occur on drainage channels, swales, and low areas and have formed <br /> from streamlaid alluvium with some slopewash. <br /> The best sources of topsoil material within the Nucla East disturbance area are the <br /> Progresso/Bond (30C) and Barx/Barx-scalped/Bari-buried (D70B) mapping units. These units <br /> occupy about 40 percent of the projected disturbance area and contain approximately 2.0 to <br /> 4.5 feet of salvageable topsoil material. <br /> 21-18 Revised 08/19/88 <br />