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58 <br />Parameter <br />Parameter <br />Suitable <br />Soil pH <br />5.5 -8.5 <br />pH <br />Soluble Salts (EC) <br />0 -8 mmhos /cm <br />Organic matter <br />25 -80 <br /><1% <br />Nitrogen (as Nitrate) <br />>12% <br />0 -10 <br />Phosphorous <br />>5 ppm <br /><3.1 ppm <br />Potassium <br /><0.1 ppm <br /><60 ppm <br />Zinc <br />Report <br />Iron <br />Report <br /><1.0 ppm <br />Copper <br />Report <br />Acid /base potential <br />Manganese <br />Report <br />Lime <br />Report <br />>2.0 ppm <br />Soil Texture <br />Describe <br /><10% <br />Table 25b Criteria to Establish Overburden Suitability (in potential root zone) <br />Parameter <br />Suitable <br />Marginal <br />pH <br />5.5 -8.5 <br />5.0 -5.5 <br />Saturation Percentage <br />25 -80 <br /><25 >80 <br />SAR <br />0 -10 <br />10 -12 <br />Selenium <br /><0.1 ppm <br /><0.1 ppm <br />Boron <br /><5.0 ppm <br />Molybdenum <br /><1.0 ppm <br />>1.0 ppm <br />Acid /base potential <br />>5.0 CaCO3 <br />Equiv. 1000 <br />tons <br />Arsenic <br /><2.0 ppm <br />>2.0 ppm <br />Organic carbon <br /><10% <br />>10% <br />RDA Reclamation Plan <br />Evaluation of the success of the reclamation practices for the DWP will determine <br />whether NECC will submit a request for an alternative reclamation plan for the RDA. <br />(f) Revegetation <br />NECC has elected to utilize the reference area approach in evaluating revegetation <br />success for cover, production, and species diversity over all areas, regardless of the <br />post- mining land use (and as modified under discussion below regarding excluded <br />areas). NECC has established one reference area for this purpose. This area is the <br />rangeland reference area located near the former Golden Eagle Mine located on <br />Colorado Parks and Wildlife lands of the Bosque del Oso State Wildlife Area. <br />Correspondence in Exhibit 15 grants NECC the authorization to enter this area for <br />the purposes of vegetation sampling. This area is marked in the field with green and <br />white striped posts. <br />NECC will also evaluate woody plant density for the upland wildlife habitat PMLU <br />Section 2.05 TR -70 03/02/2015 <br />