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\. ?? sla?G??i.S cL! l1`7l( l/T J- l^tu+r.?7 <br />J . <br />cover of living plants "A A hi will produce approximately 200 <br />pounds of air dry herbage per year. ) Ce, F ;r s? 60 <br />Revegetation Sampling Success Methods <br />As part of the termination of jurisdicti n th Division nducted revegetation <br />sampling at the Twin Pines No. 2 Mine o lu 13-14, 2006 d June 27-28, 2007. <br />The portal area and coal sales yard area were set up as separate s mpling units. Data <br />was collected on vegetative cover and herbaceous productivity. `A map of the Twin 56, <br />Pines portal area and coal sales yard is attached to this report. <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 />7 <br />V <br />M`T <br /> <br />office. <br />ve he ' aceous production was collected using harvest method. All the current <br />ears her aceous growth including grasses, forb and sub-shrubs was clipped in 30 ?`°?` t?•s <br />2 u rats. Quadrats were placed at the 0 ark on each transect and 15 other 4" <br />quadrats were clipped at alternating points o the grid for a total of 30 samples at <br />both the portal area and at the coal sales y Clipped vegetation was bagged. The <br />clipped vegetation was dried in ovens at for 10 days and then weighed. Bag <br />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 Xb.)2 <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 />County was identified by the National Oceanic and Atmospheric Administration as <br />under extreme drought, the most extreme category. Conditions had not improved by <br />6