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59 <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 />Twenty percent (20%) cover represents a soil loss of 0.33 tons/acre/year. Following <br />is a summary of the Universal Soil Loss Calculations: <br />A=soil loss in tons/acre/year <br />R=75 <br />K=0.28 (Table Mountain Loam) <br />LS=0.31 (400 foot slope at 2%) <br />C=.2 (grass cover at 20%) <br />P=.25 (contour stripping) <br />A=(75)(.28)(.31)(.2)(.25) <br />A=.33 tons/acre/year <br />The "T value" for Table Mountain Loams is 5 tons/acre/year. Therefore, a <br />20% vegetative cover producing .33 tons/acre/year would be an acceptable <br />management level. Active areas will be evaluated using the following criteria: <br />CnvPr <br />Herbaceous cover shall be greater than or equal to 90% of the reference area <br />cover (or other approved cover standard). Comparisons will be made with <br />results valid at the 90% confidence level, using a one-sided test with a 0.10 <br />alpha error probability. <br />Production <br />Herbaceous productionshall be greater than or equal to 90% of the reference area <br />production. Comparisons will be made with the results valid at the 90% <br />Section 2.05 RN -6 10/17/2016 <br />