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will be initiated. The upper four feet of regraded spoil was sampled prior to topsoil replacement <br />with a hydraulic soil sampler, a bucket auger, or other suitable equipment to ensure that a suitable <br />root growth medium was provided. Two representative samples, each representing atwo-foot <br />depth increment, were collected from a slanted grid system with 300-foot centers. Although the <br />permit required a less dense grid of 500 feet by 500 feet, WFC elected to use the more closely <br />spaced grid. The vertical sampling increments were 0.0 to 2.0 feet and 2.0 to 4.0 feet. Trained <br />personnel inspected the surface spoil between grid points. If a significant change in spoil <br />characteristics was observed between grid points, additional sample sites would be located. <br />Regraded spoil was also visually inspected for compaction, possible root growth problems, and <br />the potential for slippage at the topsoil/spoil interface. The lateral and vertical sampling intensities <br />were closely evaluated once sufficient samples were collected to determine the degree of sample <br />variability. This sampling program ensured that the top four feet of regarded spoil is non-toxic and <br />chemically/physically suitable to enhance plant growth. <br />Originally, the regraded spoil samples were analyzed for the following parameters to determine <br />spoil suitability: PH, acid base potential, particle size (texture), saturation percent, EC, and SAR. <br />The parameter list is based upon the baseline information acquired during the premine <br />• overburden sampling program (Section 2.04.6). <br />However, based on the results of the extensive overburden suitable sampling program stated <br />above, both the soil sample locations and analytical parameters changed in July of 1999. The <br />slant grid is now oriented north-south and east-west to better reflect the current mining pattern, the <br />sample grid is 600 feet by 600 feet, and the soil samples are analyzed for boron, pH and EC. In <br />the event that the sample results indicate the need, WFC will implement the Unsuitable Spoil <br />Mitigation Plan listed below. <br />Unsuitable Spoil Mitigation Plan <br />If one or more parameters fall within the unsuitable range at a given grid point, athree-part <br />mitigation plan will be implemented. <br />The area around a suspect hole will be sampled on a closer spacing interval in order to <br />better define the lateral extent and variability of the unsuitable material. <br />• cna~iaea is Nov az) 2.05.4(2)(d)- 4 <br />