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• • Page 4 <br />DOCUMENT COMMENTS <br />B. Permit Renewal- response to <br />adequacy questions. <br />Hydrology, Letter from Greystone Discusses flooding of 1 North, and <br />to Joe Dudash 1/10/94 sealing of the area, no reference to any <br />flooding in 3 North. <br />Hydrology, Greystone, response to Discussion of geology, hydrology, and <br />Renewal Stipulations 52 and 67. impacts of mining <br />March 1994 <br />Hydrology- Subsidence, Greystone, <br />Letter to Joe Dudash 4/27/94 <br />Discussion of impacts of hydrology by <br />subsidence. Effect on wells, Basin <br />Resources has stated that their <br />activities could affect the water table. <br />Notes that subsidence has occurred over <br />NW #1. Visual inspection over area does <br />not indicate any drastic or disruptive <br />surface expression that has been <br />suggested would occur. This reference is <br />in the letters and memos from the State <br />of Colorado, Department of Natural <br />Resources, Division of Minerals and <br />Geology and the OSM, discussing the <br />subsidence issues at the Tatum house. <br />Subsidence, Letter from Basin <br />Resources to Joseph Dudash, 1/3/94 <br />Discusses monitoring surveys at mine <br />on Third North panel, notes that there <br />has been no movement. 3 North has <br />been compared to 1 North because of <br />similar extraction. The comparison is <br />not valid because there is no flooding or <br />soft bottom reported in 3 North. <br />Also discussed subsidence over NW #1, <br />indicated subsidence that ranged from <br />4.5 to 6.5 feet.(See above comments) <br />