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Page 2, May 10, 2006 <br />Item 17. I recommend that portion that reads "wells, flumes and culverts will be surveyed for <br />location and elevation." be changed to read "wells, flumes and culverts will be monumented, <br />and surveyed for location, and elevation." <br />A part of the well casing, some part of the culvert, or some point on a flume might be designated <br />as the "monument" for monitoring. <br />Springs <br />Please provide for subsidence monitoring monuments at springs. <br />Rule 2.05.6(6)(c)(i)(D) Monitoring of established monuments and structures shall be <br />performed at least quarterly, commencing one month prior to the initiation of mining <br />beneath any established monument or structure. <br />See page 2.05-154. Every few days to weekly when retreat mining face is within 350 feet of the <br />station. The wording "If it is deemed necessary to check subsidence values for the South of <br />Divide mining area described in Exhibit 60B," should be deleted. It is necessary. <br />Please contact me if you have any questions. <br />