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site. In short, the community established on this site is less diverse than the Blue Flame <br />site, because of a lack of water. <br />Therefore, the following aze the revised revegetation standazds for this site: <br />- The minimum vegetative cover for this site should be 30 percent to reduce the <br />erosion potential of the steep and rocky terrain. <br />- Total production will be generally less on asouth-facing slope, but should not fall <br />below 50 grams per meter squared, or 450 pounds per acre. <br />- Total stem density on the south-facing slopes should be comparable to the north- <br />facing slopes. Therefore, the stem density should be at least 600 stems per acre, as <br />at Blue Flame Mine. <br />- Species diversity is generally limited by diminished amounts of soil water on south- <br />facing slopes. Forbs are usually more impacted by any compounded soil moisture <br />reductions -such as the current drought conditions in Colorado. Both shrubs and <br />grasses have mechanisms to survive these conditions, while forbs are more sensitive <br />to extreme reductions in moisture and will be represented less in cover sampling. <br />Sample Numbers/Sample Adequacy <br />Sample adequacy calculations were made for vegetative cover of the sampled reclaimed <br />azea. The following formula, accepted by the CDMG, was used for these calculations: <br />z z <br />nmin- t S <br />(d X~)2 <br />where <br />n,,,;° =minimum sample size <br />t =the "T" distribution value at the 90% confidence level <br />s =sample standazd deviation <br />s2 =sample variance <br />d =percent acceptable deviation from the mean (10%) <br />X~ =sample mean <br />Sample adequacy was achieved for the vegetation cover parameter. Fifteen cover <br />transects were initially sampled. Minimum sample size was 15.58, as reported in Table <br />2. <br />Statistical Analysis <br />Evaluation of revegetation establishment and success was accomplished through a <br />comparison of the reclaimed area mean total vegetative cover with the reclamation <br />success standazd set forth in the CDMG findings document. A "T" test was used for the <br />statistical comparison. This is consistent with the recommendations of the Division of <br />5 <br />