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NUCLA SWELL FACTOR STUDY <br />i .......a..,..: __ <br />A revision to Permit C-81-008 was submitted to CMLRD on November 1, 1966. This revision <br />was subsequently approved, and contained certain commitments made by Peabody. One such <br />commitment was to evaluate the swell factor utilized to develop the po stmini ng 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 />1•fethodoloov <br />The general methodology utilized in this srvell factor study was to ca l~culate the amount of <br />bank and loose cubic yards of material excavated, then determine the swell factor. The <br />average-end-area method was used to determine the volumes. <br />In preparation for the calculations, cross sections depicting the existing topography <br />(premi ni ng cross sections) prior to any mining activity, were surveyed. throughout Area No. <br />1 as shown on Figure 1. Once mining had progressed sufficiently to develop an adequate <br />amount of cut and fill material, another set of cross sections (postmining cross section) <br />were surveyed along the premini 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 />reviewed for reasonableness. Upon review of the cross sections, i~t 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 ca l~culations. The cut <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 />fill was calculated and shown on Table 1. <br />