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l~lr. David Berry <br />Senior Environmental Protection Specialist <br />December 19, 1997 <br />Page 5 <br />17. is there an existing means to monitor water accumulation within the Bear Mine? Are you <br />performing such monitoring? <br />Beaz -There is no means to monitor water accumulation within the Beaz No. 3 Mine. <br />18. CDMG has previously requested that MCC compute "time to fill" calculations for the <br />West Elk Mine, and to evaluate the PHCs associated with this scenazio. Please provide <br />the compazable hydrologic analysis for the Bear Mine. What aze the projected PHCs, <br />including slope stability, when [he Bear Mine is filled with water? <br />Bear - No "time to fill" calculations or PHC projections have been made by Beaz for <br />mine discharge. <br />19. Please characterize the general water quality impacts to the North Fork posed by Bear <br />Mine operations, including both "point" and "nonpoint" impacts. How has stormwater <br />runoff from the mine site been managed historically? How is it being managed now? <br />How do these impacts compare with those seen from the current Edwazds Mine <br />discharge? <br />Beaz -The PHC section of Bear's mining permit (File #1 ~) presents most of the <br />requested data. No comparison has been made of this data compazed to the impacts from <br />the recent mine discharge. Run-off from the mine site has be contained in the sediment <br />pond. <br />20. From the onset of the landslide in mid-November to the present, have you observed <br />smoke emerging from cracks and snow melting in particular locations? Were there any <br />"hot spots" within the Bear Mine or adjacent mines? <br />Bear - No smoke has been observed emerging from cracks nor snow observed melting. <br />Beaz had two "hot spots" within the Bear Mine. One of the hot spots was in the pillar <br />between the intake and return approximately 140-feet inby the portal. It was <br />approximately four to five feet long. The pillar was cooled by water injection into the hot <br />spot. The second hot spot was in the small triangulaz shaped pillaz in the return neaz the <br />portal. This pillaz was also cooled with water injection. Bear has not investigated the <br />presence of "hot spots" in adjacent mines. <br />21. How might an underground fire affect the behavior of this landslide (e.g., could fire <br />compromise pillar integrity and stability, enhance secondary porosity, "focus" <br />groundwater flow dischazges into the Edwards Mine, or increase air pressure so as to <br />impart slope stability)? <br />