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COLOWYO COAL COMPANY L.P. <br />1999 HERBACEOUS COVER/ WOODY PLANT MONITORING INFORMATION <br />1995, 1997 RECLAIMED AREAS <br />LOCATION: Colowyo Coal Co., L. P. Meeker CO <br />YEAR OF RECLAIMED AREAS SAMPLED: 1995. 1997 <br />SAMPLERS: L. VanAmburg, V. Williams <br />HERBACEOUS COVER <br />Herbaceous cover data for 1999 was collected using the Point Frame sampling <br />method on the reclaimed areas listed above. Procedures for using this method include <br />randomly selecting five points along a 100-foot transect. At each randomly selected <br />location, a point frame is placed perpendicular to the transect at a 45-degree angle. <br />The point frame is divided into ten equal sections that allow a pin to be slid down the 45- <br />degree angle until the pin hits an object. Each first hit is recorded either by vegetative <br />species, litter, rock, or bare ground. <br />Due to differences in elevation, climate, and other environmental factors, sample <br />areas were first divided into three sections: East Pit, West Pit, and Section 16. <br />Throughout each of the three areas, five transects were first taken on both the 1995 and <br />1997 reclaimed areas resulting in an initial 25 sample points (N) per reclaimed area. To <br />determine whether or not adequate sampling had been done, the sample adequacy was <br />calculated for each area using the following formula: <br />N=tzsZ <br />(dax)z <br />Where: N =required number of transects <br />d =desired level of precision (0.1 the level of precision for estimate <br />of the mean to be within 10% of the actual mean). <br />z =sample mean <br />sz =sample variance <br />t =the ; _ .05 t-table value for a two tailed t-test with n-1 degrees of <br />freedom. <br />