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2016-01-07_PERMIT FILE - C2010089A (16)
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2016-01-07_PERMIT FILE - C2010089A (16)
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Last modified
3/22/2018 8:21:52 AM
Creation date
2/19/2016 9:47:24 AM
Metadata
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Template:
DRMS Permit Index
Permit No
C2010089A
IBM Index Class Name
Permit File
Doc Date
1/7/2016
Doc Name
Overburden and Topsoil Handling Plan
Section_Exhibit Name
Section 2.05.4(2)(d)
Media Type
D
Archive
Yes
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Table 2.05.4(2)(d)-1 Criteria for Evaluating Bench 1 Suitability <br />PARAMETER <br />SUITABLITY <br />pH <br />Between 6.1 and 8.5 <br />Neutralization Potential Ratio (NPR) <br />>2 <br />Course Fragment Content (%) <br />< 20 <br />Sodium Absorption Ratio (SAR) <br />< 15 <br />Electrical Conductivity (mmhos/cm) <br />< 6 <br />Carbonate (%) <br />< 20 <br />Selenium (ppm)1 <br />< 1 <br />Texture <br />All soil textures except: s, Is, sc, sic, c <br />'This value for selenium was chosen based on guidance from Dave Dearstyne of NRCS and recent data that other states are <br />using. Mr. Dearstyne is currently working extensively (2008) with the Selenium Task Force on the western slope and is very <br />knowledgeable about this issue. Mr. Dearstyne noted that there is no concern for selenium unless Mancos shale strata are being <br />placed near the surface. At the NHN Mine, no Mancos shale has been encountered in the overburden. Also, all tests of water <br />soluble selenium in the pre -mine soil survey of NHN Mine show all values less than 0.1 ppm. Mr. Dearstyne believes a threshold <br />suitability level of 0.2 ppm in the topsoil material and 1.0 ppm in the subsoil material is adequate. These are the levels proposed. <br />Unsuitable Bench 1 Backfill Mitigation Plan <br />If the results of the sampling indicate that one or more of the unsuitable levels are reached, the <br />Division will be contacted. Also at that juncture, WFC will resample the area to determine the <br />extent of the unsuitable Bench 1. If the problem area is greater than one acre in size it will be <br />necessary to remove or cap the area. If only the lower sample Bench 1 failed, then only two feet <br />of Bench 1 will be added to the area and resampled. If both samples (0-2' & 2'-4') failed where <br />the post -mine land use is Dryland Pasture, any area over one acre will be capped with four feet <br />of suitable material. For areas that have a post -mine land use of irrigated pasture the problem <br />area will be excavated to a depth of four feet, and four feet of suitable Bench 1 will be placed <br />within the excavated area. <br />Topsoil Management Plan <br />The NHN Mine topsoil management plan is based upon the detailed topsoil survey contained in <br />Section 2.04.9, and it has been developed to insure that the most suitable topsoil materials within <br />the disturbance area are salvaged. The topsoil management plan evaluates the topsoil resources <br />and describes salvage depths and techniques, storage, redistribution, and maintenance or testing <br />procedures necessary to restore the disturbed areas to the desired post -mine land use. <br />Evaluation of Topsoil Resources <br />The topsoil resources found in the NHN Mine permit area are shown on Map 2.04.9-3 — Topsoil <br />Salvage Map, and are typical of topsoil found in the semi -arid Colorado Plateau Physiographic <br />Province, Canyon Land Section. A total of eleven different topsoil mapping units were <br />delineated in the survey performed on the NHN Mine Area. Five of these topsoil mapping units <br />lack salvageable topsoil and include livestock ponds, roads, drainage channel, soils mapping unit <br />78UT (5 to 30 percent slopes), and soils mapping unit RO (40 to 90 percent slopes). These areas <br />Section 2.05.4(2)(d) Page 3 Sept. 2015 (TR -11) <br />
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