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Edna Mine Vegetation Final Bond Release Monitoring 2005-2006 <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% 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 />NOTE: By generating random X and Y offsets for positioning the grid, <br />every point inside the reference area is given an equal opportunity of <br />being chosen as a sample point. <br />4. To minimize edge effect influences on vegetation samples, grid <br />intersections that lie within 25 feet, or 1/4 of the grid interval distance <br />when the grid spacing is 100 feet or less, from the vegetation community <br />boundary will be eliminated from an areas potential sample set. <br />Habitat Management, Inc. 7 4/8/2005 <br />