2009-09-14_REVISION - C1996083 - Laserfiche WebLink

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13. Based on the Division's calculation that the area of Gob Piles #1 and #4 increased by approximately 1 acre, and based on BRL's statement that 36.3 acres require reclamation (Volume IX, Page 11), the Division believes that there may be a topsoil deficiency for final reclamation of the gob piles and associated areas. BRL states that one foot of topsoil will be placed over three feet of subsoil for final reclamation (Volume IX, Page 11, first paragraph). BRL also states that there is approximately 56,900 cubic yards of topsoil for reclamation. The Division believes that with the increased size of Gob Piles #1 and #4, there are 37.3 acres requiring reclamation. For a flat area the topsoil required to cover these areas to a depth of one foot is 60,200 cubic yards, a deficiency of 3,300 cubic yards (or 0.7 inches). The surface area for the 3:1 and 2.5:1 slopes of the gob piles will be greater than the flat area of 37.3 acres, leading to a greater topsoil deficiency. Please review the topsoil balance for the gob piles and associated areas and revise the topsoil replacement plan as necessary. Note, there does not appear to be a problem with the subsoil for the gob piles and associated areas as there is an excess of almost 40,000 cubic yards of material. 14. Based on a review of proposed Maps 15-3, Sheet 3 of 4, Mine Facilities and Volume IX, Figure 1, Coal Mine Waste Disposal Area, there appears to be a possible increase in the disturbed area of the mine. There is an undisturbed area that is surrounded on the west by Gob Pile #1, on the east and south by topsoil stockpiles and on the north by Gob Pile #4. The expansion of Gob Pile #4 to the south (to the lower elevation) pushes into this undisturbed area. The Division digitized this area and found that it decreased from 1.65 acres to 1.05 acres. Additionally, there is a small area to the north of Gob Pile #4 where the pile has pushed into the undisturbed land above (as the piles maximum height increases and its shape changes from an angular one to a more rounded one). Please review the changes to the pile as they relate to the surrounding undisturbed lands and update the revision application to reflect any changes as necessary. 15. Based on a review of Volume IX, Figure 1, Coal Mine Waste Disposal Area, the horizontal scale of the inset cross-section B-B' has been changed and appears to be in error. The horizontal scale on the currently approved figure is shown as 40 feet/inch. The horizontal scale on the revised figure is shown as 100 feet/inch. This changes the length of the cross section from 600 feet to 1,500 feet. To further complicate the issue, based on the scale of the small map showing the gob piles, at 200 feet/inch, cross-section B-B' is only 300 feet long (1-'h inches). Based on the 2:1 slope indicator on the "Proposed Ground Surface" line for cross-section B-B', it appears as though the correct horizontal scale should be 20 feet/inch. Please check the B-B' cross-section line and detail and correct the scale as necessary. 16. Based on a review of Volume IX, Figure 1, Coal Mine Waste Disposal Area, the horizontal scale of the inset cross-section C-C' has been changed and appears to be in error. The horizontal scale on the currently approved figure is shown as 40 feet/inch. The horizontal scale on the revised figure is shown as 100 feet/inch. This changes the length of the cross section from 800 feet to 2,000 feet. To further complicate the issue, based on the scale of the small map showing the gob piles, at 200 feet/inch, cross-section B-B' is only 400 feet long (2 inches). Based on the 2:1 slope indicator on the "Proposed Ground Surface" line for cross-section C-C', it appears as though the correct horizontal scale should be 20 feet/inch. Please check the C-C' cross-section line and detail and correct the scale as necessary. 3