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Edna Mine Vegetation Final Bond Release Monitoring 2005-2006 <br />5. Potential sample start points are located at each grid intersection that falls <br />within the area being monitored. A random whole number between 1 and <br />the maximum number of potential sample points is then generated for <br />each intersection; no duplication of whole numbers is permitted. Random <br />numbers are assigned to grid intersections from west to east and north to <br />south until all intersections lying within the sample area have been <br />assigned a random sample order number. <br />6. Sample start points are located in the field using one of two survey <br />methods: 1) GPS equipment or 2) physical survey. When locating sample <br />points by GPS survey either sample point coordinates, or grid intervals <br />and bearings may be used. Sample points will be located in the field using <br />a sub-meter GIS grade GPS unit. When physical measurements are <br />used, a visible landmark is identified in the field. Sample start points are <br />then located by either chaining or stepping off the distances to them on <br />predetermined bearings. Following field location, each vegetation <br />parameter is monitored at the random sample start points in numerical <br />order until sample population statistical adequacy is satisfied. <br />This process is repeated for each vegetation community to be sampled. A map <br />identifying the selected sample points for each vegetation parameter sampled <br />within each sampled area is generated to document sample point locations. <br />For example, 44 potential sample points would be selected and identified for a <br />specified maximum sample population of 40. With a sampling area size of 440 <br />acres the grid spacing would be adjusted so that each location represents a grid <br />size of 10 acres. Ten acres equals 435,600 square feet. The square root of <br />435,600 square feet is 660 feet. The gird interval in this example would be set at <br />a 660-foot interval. For our example two values between 0 and 660 feet would <br />be generated for the "X" and "Y" coordinates. These values would be used to fix <br />the grid over the area to be sampled. A graphic example of this random sample <br />Habitat Management, Inc. 8 4/8/2005 <br />