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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 />10 <br /> <br /> <br />In the a lication, it is stated that there is some "minor <br />rest entia use o oa u ch water. a ivision requests <br />state tnis in the application. <br />Res on~se: There are no adjudicated wells or wells listed with <br />t-fie ate 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 />cation should provide the Divisi <br />the monitorin the a iicant snouia aoaress the amount or <br />movement, t e ocation of movement an t e amount o inf ow w is <br />Response: Peerless does not currently plat <br />any areas where overburden thickness is <br />Although overburden thickness varies over <br />property, areas where overburden thickness <br />are primarily associated with the channels <br />in the area to be mined. <br />to extract pillars in <br />less than 300 feet. <br />the entire Coal Gulch <br />is less than 300 feet <br />of ephemeral drainages <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 />