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Section 316.'_16 (a) Continued. <br />• Management of Reference Areas <br />During the mining operations and throughout the liability period, <br />reference areas will be subjected to the same land management <br />practices as those encountered on undisturbed adjacent areas. For <br />example, cropland reference areas will be cropped during the inter- <br />im period to simulate postmining use and reference areas located in <br />rangeland and pastureland areas will be grazed. <br />Success Standard Determination <br />In order to determine if the revegetated area equals or is within <br />90 percent of the plant production and ground cover which existed <br />prior to mining, the following procedures, outlined in Guideline <br />No. 2 (1979), Wyoming Department of Environmental Quality, will be <br />used. <br />- From the premining field data, the average percent cover and produc- <br />tivity for the affected range sites (rl) and the reference areas <br />(vl), will be calculated. From the postmining field data, the <br />average percent cover and productivity for the revegetated area <br />(s2) and reference areas (y~~) will be calculated. The equation: <br />/~ - xl `~? <br />h yl <br />Where: - is the success standard. <br />x <br />If (yl) is equal to (}'~), the ^ equals the premining value (xl) <br />and the percentage which (~;l) varied from (yl) will be applied to <br />n <br />(v Z); and the product eaill be the success standard (X ). <br />.• <br />816-157 <br />