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r <br />-MINE l.D.: Apex No. 2 Mine. C-81-011 <br />Phase [I Bond Release Study <br />- SAMPLE DATES: Middle of August. <br />MINE SUMMARY <br />- MINE LOCATION: Routt County, between approx. 7380' and 7425' elev. <br />- MINE ACREAGE: Valley bottom: 2.21 acres; Hillside: about I.0 acre. <br />-PARAMETERS: Cover (and species diversity). <br />- SAMPLE HISTORY: Long term study began in 1994. <br />- SUCCESS: Based on comparison to standards. <br />Page 18 of the approved permit document states that success will be based on: <br />Valiev Bottom Hiil i e <br />Herbaceous Cover: 70% 41 % <br />Herbaceous Productivity: 3500 lbs/acre 500 Ibs/acre <br />Species Diversity: Using relative cover or production values for each species, the <br />reclaimed areas will have at least tour perennial species with relative importance equal <br />to or greater than 30%, but with all species combined not to exceed 75% in relative <br />importance. Any one of the four species cannot exceed 40% in relative importance." <br />Woody stem density: No success requirement. <br />METHODS --------------------------------------------- <br />QUANTITATIVE SAMPLING -GENERAL: <br />- MINIMUM SAMPLE NUMBERS: 5 samples in the Hillside community and <br />10 samples in the Valley Bottom. These minimums are proposed due to the small area <br />of the reclaimed surfaces. <br />- ADEQUACY: Will be sampled to adequacy (using statistical calculations <br />given on pages 20 and 21 of the Division's Bond Release Guidelines (G i eline <br />ReEarding Selected Coal Mine Bond Release Issues). <br />- LOCATION: Each community will be sampled individually and compared <br />separately to its respective standard. <br />- RANDOM: Selection of sample locations within each reclaimed community <br />will be random, and will involve the selection of points from a gridded map. <br />- FIELD PLACEMENT: Location of sample points in the field will be with <br />compass and pacing. <br />- MAP: Approximate location of sample poinu will be designated on a map that <br />will be enclosed with the report. <br />T9TAL VEGETATIVE COVER: <br />- Total vegetative cover will be estimated using an optical point frame <br />developed by ESCO Associates. <br />- Cover transects will originate from the sample point locations. <br />- Point sitings will be located along a 25 meter transect stretched out either <br />northwest, northeast, southwest, or southeast of the sample location (the direction will <br />be randomly selected from the four possibilities). 25 meter transecu are proposed <br />because of the constricted nature of the reclaimed areas. <br />- The 50 points per transect (one point at each half meter interval) will comprise <br />a single sample unit. Cover will be identified by plant species, or as rock, litter, or <br />