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57 <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 />and the riparian wildlife habitat PMLU based on the success of shrubs transplanted in <br />the shrub clumps re- established on the reclaimed area. <br />NECC will be evaluating revegetation success using the criteria of vegetation cover, <br />production, diversity and woody plant density. These criteria will be used in <br />evaluating active mining areas. Active mining areas include the refuse disposal area <br />(north of highway 12), the east portal area including disturbances east of the C & W <br />roundhouse. Areas excluded will include the riparian habitat adjacent to the <br />Purgatoire River and the West Portal area. The non -coal waste area located in the <br />West Portal is considered active. <br />The "excluded areas" will be evaluated using cover criteria only. NECC will use <br />20% cover as a standard for erosion control. Revegetated cover will consist of a <br />permanent vegetative cover consistent with the proposed post- mining land use of <br />rangeland. <br />Section 2.05 TR -68 12/10/2014 <br />