Laserfiche WebLink
Ms. Christine Johnston <br />Mountain Coal Company <br />Page 9 <br />April 14, 1997 <br />49. The Division requested that MCC locate the three water diversion systems on a map. <br />MCC responded that the sources for these diversions are located on Map 37. However, <br />the Division is requesting that the actual structures' locations be shown on a map. Please <br />provide such a map with these structures' locations on it. <br />50. The Division believes that permeability tests conducted in one borehole located south of <br />the proposed exhaust shah location Wray not adequately chazacterize the ground water <br />inflow conditions that may be encountered during shaft construction. Please provide the <br />Division with a detailed contingency plan for disposition of ground water in the event that <br />inflows during construction and operation of both the ventilation and exhaust shafts <br />exceed the predicted maximum of 25 gallons per minute. <br />51. MCC has stated that there will not be any mine water discharge through the Sylvester <br />Gulch pond SG-1 drainage system, other than the temporary discharge of 25 gpm during <br />shaft construction. The Division still has concerns about base flow, from springs and the <br />temporary mine water pumpage, as it concerns the Sedcad designs for ditches and <br />culverts. Please see response number 24 in this letter. <br />52. The Division has no further concerns. The Division requested that MCC provide a written <br />commitment of in-compliance discharges. MCC has submitted a revised page 2.05-27 with <br />the March 7, 1997 submittal. <br />2.05.3 5 Topsoil <br />53. The Division accepts the commitment by MCC to replace an average of 12 to 18 inches <br />of topsoil, as long as it is understood that the 12 inches are a minimum depth of <br />replacement and not an average between eight and 16 inches, or any other combination <br />of numbers to come up with a minimum average. Please add, or corcect the document to <br />confirm this agreement, or understanding. <br />2.05.4 Reclamation Plan <br />54. This timetable information provided should be included in the permit application. Please <br />revise the permit document to include this information. <br />55. DMG is still in need of additional information to be used in developing a reclamation cost <br />estimate, as described in this letter. As previously requested, the additional information <br />should be included in the appropriate section(s) of the permit application package. MCC <br />did not revise the permit application text to incorporate all of their March 11, 1997 <br />responses. <br />