Laserfiche WebLink
seeding has been conducted since then. <br />The approved reclamation standard for the Twin Pines Mine No. 2 Mine is a <br />minimum ground cover of living plants was to be established which will produce <br />approximately 200 pounds of air dry herbage per year. <br />Revegetation Sampling Success Methods <br />As part of the termination of jurisdiction process, the Division conducted <br />revegetation sampling at the Twin Pines No. 2 Mine on June 13-14, 2006 and June <br />27-28, 2007. The portal area and coal sales yard area were set up as separate <br />sampling units. Data was collected on vegetative cover and herbaceous productivity. <br />Prior to collecting the field data for cover and production, a map was prepared with <br />GPS coordinates for the sampling locations. A random start, systematic 25 meter grid <br />was established over the portal area and a 30 meter grid was set up at the coal sales <br />yard area. Cover and production data were collected at fifteen points on the grid. <br />Cover was collected along a 10-meter transect. An optical 10-point bar was placed <br />perpendicular to the transect at each meter along the transect. A point-intercept <br />observation was made at each 10-cm interval along the one meter point bar for a total <br />of 100 points per transect. Data was recorded on field sheets and analyzed in the <br />office. <br />Live herbaceous production was collected using a harvest method. All the current <br />year's herbaceous growth including grasses, forbs and sub-shrubs was clipped in 30 <br />2 mz quadrats. Quadrats were placed at the 0 mark on each transect and 15 other <br />quadrats were clipped at alternating points on the grid for a total of 30 samples at <br />both the portal area and at the coal sales yard. Clipped vegetation was bagged. The <br />clipped vegetation was dried in ovens at Colorado State University (CSU) for 10 days <br />and then weighed. Bag weights were subtracted from the biomass calculations. <br />Sample adequacy for cover and production was calculated using the formula <br />nmin - (t)2(S)2 <br />(d Xba,.)z <br />Results <br />Revegetation sampling was conducted on June 13-14, 2006 and June 27-28, 2007. <br />This time period coincided with maximum vegetative growth potential and <br />development of the majority of plant species found in both the native vegetation <br />community and the reclaimed area to be evaluated. <br />Weather conditions were a factor in the sampling results. In April 2006 Fremont <br />6