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Regraded Spoil Monitoring Program. In order to provide a feedback system to check the <br />reliability of the overburden sampling and analysis program, a regraded spoil sampling program will <br />be initiated. The upper four feet of regraded spoil was sampled prior to topsoil replacement with a <br />hydraulic soil sampler, a bucket auger, or other suitable equipment to ensure that a suitable root <br />growth medium was provided. Two representative samples, each representing a two-foot depth <br />increment, were collected from a slanted grid system with 300-foot centers. Although the permit <br />required a less dense grid of 500 feet by 500 feet, WFC elected to use the more closely spaced <br />grid. The vertical sampling increments were 0.0 to 2.0 feet and 2.0 to 4.0 feet. Trained personnel <br />inspected the surface spoil between grid points. If a significant change in spoil characteristics was <br />observed between grid points, additional sample sites would be located. Regraded spoil was also <br />visually inspected for compaction, possible root growth problems, and the potential for slippage at <br />the topsoil/spoil interface. The lateral and vertical sampling intensities were closely evaluated once <br />sufficient samples were collected to determine the degree of sample variability. This sampling <br />program ensured that the top four feet of regarded spoil is non-toxic and chemically/physically <br />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 overburden <br />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 slant <br />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 the <br />event that the sample results indicate the need, WFC will implement the Unsuitable Spoil Mitigation <br />Plan listed below. <br />Unsuitable Spoil Mitigation Plan <br />If one or more parameters fall within the unsuitable range at a given grid point, a three-part <br />mitigation plan will be implemented. <br />(Revised 24 AUG 06) 2.05.4(2)(d)-7 <br />7-14