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Empire Eagle Mine Vegetation Final Bond Release Monitoring 2005-2006 <br />mid-September, depending upon a given year's precipitation patterns. Woody <br />' stem density measurements may be taken any time of the year, but normally <br />they will be performed in conjunction with cover and production sampling. <br />' STRATIFIED RANDOM SAMPLE POINT SELECTION <br />' Vegetation parameter samples will be randomly taken from Reclaimed Bond <br />Release Units and their respective reference areas, when applicable. A stratified <br />' random grid will be used to select sample start points. Random points will be <br />selected within each mapped vegetation community that is to be sampled using <br />the following methodology: <br />1. A square grid will be created and overlaid on the composite sampling area <br />(i.e., areas to be sampled may not be contiguous, they may be comprised <br />of one or more subareas). The maximum number of potentially required <br />samples will be used to determine grid interval for each sampled area. <br />Extra sample points will be included for sample location problems <br />potentially encountered in the field during monitoring. Typically, 10°.5 of the <br />maximum required number of samples points will be added to the <br />maximum sample population for each vegetation parameter sampled <br />within a given area. <br />2. Grid intervals will be custom fit based on the sampling area's size. The <br />total sample area is divided by the total number of sample points to <br />determine the average acres per sample point. The average number of <br />acres per sample point is multiplied by 43,560. The square root of this <br />product is derived to determine the appropriate grid spacing interval to the <br />nearest whole integer. <br />3. Random offsets for the grid's primary "X" and "Y" coordinates are <br />generated. The grid is randomly positioned over its respective sampling <br />area using these two random coordinates from a fixed reference point. <br />' Habitat Management, Inc. 5 6/7/2006 <br />