Laserfiche WebLink
<br /> <br />NUCLA SWELL FACTOR STUDY <br /> <br />A revision to Permit C-81- <br />was subsequently approved, <br />was submitted to CMLRD on November 1, 1986. This revision <br />contained certain conmitments made by Peabody. One such <br />commitment was to evaluate the swell factor utilized to develop the postmining topography <br />landform, and determine if that swell factor is reasonable. The results of the evaluation <br />were to be submitted to CMLRD. <br />A swell factor study was initiated in the first cut of Area No. 1 in December, 1986. The <br />methodology and results of this study are presented below. <br />Methodology <br />The general methodology util <br />bank and loose cubic yards <br />a verage-end-area method was <br />In preparation for the <br />(premining cross sections) <br />i zed in this swell factor study was to calculate the amount of <br />of material excavated, then determine the swell factor. The <br />to determine the volumes. <br />culations, cross sections depicting the existi nc topography <br />rior to any mining activity, were surveyed throughout Area No. <br />1 as shown on Figure 1. Odce mining had progressed sufficiently to develop an adequate <br />amount of cut and fill ma tefial, another set of cross sections (pos tm i~ni ng cross section) <br />were surveyed along the premi ni ng cross section to define changes in the topography <br />resulting from the mining operations. These cross sections are enclosed. <br />To determine the volumes of material, both sets of cross sections were plotted and <br />and fill area was then calculated at each cross section. After the areas were calculated <br />and average distance between each cross section determined, the volume of both cut and <br />reviewed for reasonableness. Upon review of the cross sections, it was necessary to <br />define three types of areas) These areas are: fills, cuts, and single areas of both fill <br />and cut. The areas of fill and cut represent portions of the pit that were excavated and <br />later filled upon. These areas were included in the fill and cut calculations. The cut <br />fill was calculated and <br />on Table 1. <br /> <br />