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<br />4 <br />When cover data from the reclaimed mine site is compared to the 70$ <br />vegetative cover success standard using Student's t-test, the cover <br />value on the reclaimed area is at least 90$ of the standard at a <br />90$ confidence level. Therefore, the site meets the requirements <br />of Rules 4.15.8(3) and 3.03.1(2) related to establishment of <br />vegetation for Phase II bond release. A copy of the report <br />referenced above is enclosed. <br />III. Statistical analysis performed by DMG <br />AFO requested that DMG provide a copy of the statistical analyses <br />performed by DMG of the Meeker vegetation data. A report entitled <br />"A Comparison of Meeker Mine Vegetative Cover Data Collected by the <br />Division of Minerals and Geology to Data Collected by the Mine <br />Operator" is enclosed. This report summarizes DMG's statistical' <br />evaluation of the Meeker vegetation data. <br />IV. sedimentation demonstrations <br />Enron submitted an application for a revision to the Meeker Mine <br />permit incorporating a methodology for comparing sediment derived <br />from the reclaimed mine site to pre-mine conditions. DMG has <br />approved this revision. The basic premise of the revision is: <br />1. Premine sediment generation (the area was disturbed prior <br />to SMCRA) is estimated by applying the Universal Soil Loss <br />Equation to baseline data conditions collected on land <br />adjacent to mine disturbance. <br />2. Sediment generated from the reclaimed area during the <br />liability period is estimated from surveys of the sediment <br />ponds. <br />3. Results of the two analyses above are compared to each <br />other to determine if the reclaimed area is contributing <br />suspended solids to runoff outside the permit area in excess <br />of premine levels. <br />As mentioned above, DMG has approved this proposed methodology. A <br />copy of the revision is enclosed. The results of the operator's <br />pond surveys have not yet been submitted to DMG. Those results will <br />be forwarded to AFO when they are available. <br />