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<br />Mr. Michael S. Savage Page Five <br />June 28, 1985 <br />In addition, as sediment accumulates in the pond, any <br />infiltration should be minimized or eliminated. Peerless does <br />not believe that this problem is a serious one, but will <br />nonetheless, move to correct the situation if in fact water is <br />infiltrating into the ground beneath the sediment pond. <br />9. In the a lication, it is stated that there is some "minor <br />rest entia use o Coate ch water. The Division requests <br />information on the location and pro.iected use of this water. If <br />this is not an adjudicated or legal well, the applicant should <br />on. <br />Response: There are no adjudicated wells or wells listed with <br />the State Engineer along Coal Gulch. Peerless believes that <br />there is some "minor residential use" of Coal Gulch water below <br />the mine, but these wells have not been permitted with the State <br />Engineer. <br />10. The a lication should rovide the Division with a subsidence <br />monitorin lan above all drains es, s ecifica to the <br />Wort west of the faci ities area and in t e area to a mine n <br />the monitoring, the aoolicant should a dress the amount of <br />movement, the iocat~on or movement and the amount or inriow wnicn <br />is t en dep ete by movement into the fracturing. <br />Response: Peerless does not currently plan to extract pillars in <br />any areas where overburden thickness is less than 300 feet. <br />Although overburden thickness varies over the entire Coal Gulch <br />property, areas where overburden thickness is less than 300 feet <br />are primarily associated with the channels of ephemeral drainages <br />in the area to be mined. <br />Based upon the proposed mining plan, maintenance of pillars in <br />the zone directly beneath these areas of limited overburden <br />thickness and haulage protection pillars will provide adequate <br />protection to prevent subsidence in the ephemeral drainages. <br />During the initial phases of the mining operations, Peerless will <br />conduct subsidence monitoring surveys to evaluate the location <br />and extent of any subsidence which may occur. Subsidence surveys <br />will occur on a semi-annual basis following completion of coal <br />extraction in a given monitoring zone. Peerless will place five <br />(5) permanent survey monuments as shown on the Mine Plan Map (Map <br />11) for subsidence monitoring. Subsidence monitoring monuments <br />will be installed as shown by Figure 4, Subsidence Monitoring, <br />Typical Monument Detail, to allow accurate documentation of both <br />horizontal and vertical ground displacements. <br />