Laserfiche WebLink
2.0 SAMPLING METHODS <br />2.1 Sample Layout <br />The sample layout protocol for the revegetation evaluation is a procedure designed to better <br />account for the heterogeneous expression of the multiple seedings within the various reclaimed areas <br />while precluding bias in the sample site selection process. By design, the procedure is initiated randomly, <br />and thereafter, samples are identified in a systematic manner, along grid coordinates spaced at fixed <br />intervals, e.g. 100 ft. (see Figure 1 and Maps 2 through 7). In this manner, "representation" from across <br />the entire reclaimed area is "forced" rather than risking the chance that significant pockets (or seedings) <br />are entirely missed, or overemphasized as often occurs with simple random sampling. Sample site <br />selection within the reference area occurred in a similar manner, although the grid dimensions were <br />altered accordingly to accommodate the different size. <br />The actual procedure for sample site location occurred as follows. First, a fixed point of reference <br />locatable from year to year was selected. Second, a systematic grid of appropriate dimensions (e.g., 140 <br />ft. X 140 ft.) was selected to provide at least one sample within the smallest disturbance footprint of each <br />of the combined units. This resulted in 97 sample points in the Greasewood Comparison Areas and 125 <br />sample points in the Shadscale Comparison Areas. Reference areas were fitted with grids that <br />accommodated 30 sample points. Third, a scaled, computer generated representation of the selected <br />grid was overlain on a computer generated map of the area utilizing north -south and east -west compass <br />points which could be easily established in the field. Initial placement of the grid was controlled by the <br />fourth step, selection of a pair of random numbers (between 0 and 100) used to facilitate location of the <br />initial coordinate point from the fixed reference location. Fifth, using a hand held surveying compass (or <br />GPS) and hip -chain (or pacing techniques) all sample points were located in the field. The locations of all <br />2011 sampling sites are indicated on Maps 2 - 7. On occasion (drill pads only) a systematic point had to <br />be forced into the disturbance footprint because of the small size of the revegetated unit. This was <br />accomplished in an unbiased manner and the direction of the ground cover transect was then randomly <br />determined. <br />Once a selected grid point was located in the field, ground cover sampling transects were always <br />oriented in the direction of the next site to be physically sampled to further limit any potential bias while <br />facilitating sampling efficiency. This orientation protocol follows that which is indicated on Figure 1. <br />Depending on logistics, timing, and access points to the target sampling area, the field crew would <br />occasionally layout a set of points along coordinates in one direction and then sample them in reverse <br />order. However, orientation protocol was always maintained (i.e. in the direction of the next point to be <br />physically sampled). If the boundary of an area was encountered before reaching the full length of a <br />Cedar Creek Associates, Inc. 9 Snowcap Mine - 2011 <br />Phase III Bond Release Evaluation - Year 1 <br />