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REV105462
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REV105462
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Entry Properties
Last modified
8/25/2016 1:17:12 AM
Creation date
11/22/2007 1:26:23 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981038
IBM Index Class Name
Revision
Doc Date
12/17/2004
Doc Name
Response to Request Assistance for Review (Interoffice Memorandum)
From
Byron Walker
To
Joe Dudash
Type & Sequence
TR45
Media Type
D
Archive
No
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foot is indicated about three to four years later. Information suggests there has been no <br />subsidence for the last four years. <br />A history of subsidence of Station 83 is at Attachment 7. The application states that it is within <br />the angle of draw and affected by entry work in 1995. It is located at the boundary of 1995 <br />mining. A drop of 0.3 foot is indicated about a yeaz later. Information suggests there has been no <br />subsidence for the last four yeazs. <br />A history of subsidence of Station 95 is at Attachment 8. The application states that it is within <br />the angle of draw of mining unpillazed rooms in 1997. It is located at the boundary of 1997 <br />mining and mining previous to 1995. A drop of a foot is indicated around 1997 to 1998. <br />Information suggests there has been no subsidence for the last four years. <br />A history of subsidence of Station 99 is at Attachment 9. The application states that it is not <br />within an angle of draw of anticipated subsidence. It is located 1490 feet from the closest mining. <br />Early information is erratic, and suggests different survey techniques. No subsidence should have <br />been expected. Information suggests there has been no subsidence for the last seven years. <br />A history of subsidence of Station DH55 is at Attachment 10. The application states that it is <br />within the angle of draw of mine workings, most recently affected by entries in 1995. It is <br />located at the boundary of mining previous to 1995, and some 1070 feet from 1995 mining. <br />About half a foot drop is indicated in the 1996 time frame. Information suggests there has been <br />no subsidence for the last seven years. <br />A history of subsidence of Station DH65 is at Attachment 11. The application states that it is <br />within the angle of draw of mine workings, most recently affected by unpillared rooms work in <br />1997. It is located at the boundary of 1997 mining. A gradua10.4-foot drop is indicated from <br />then to present. Information suggests there subsidence has slowed or has been arrested for the <br />last four years. <br />A history of subsidence of Station DH66 is at Attachment 12. The application states that this <br />point is not within the angle of draw of mine workings, most closely approached some 1,250 feet <br />away by entries work 1997. It is located away from all mine workings. No subsidence would be <br />anticipated, and information suggests there has been no subsidence (in the more reliable survey <br />information) over the last five years. <br />A history of subsidence of Station DH68 is at Attachment 13. The application states that this <br />point is within the angle of draw of entries work in 1995. It is so located, but is also directly over <br />mining previous to 1995. There is an indication of about two foot of subsidence up to 2000. <br />Information suggests there has been no subsidence for the last four years. <br />In summary, subsidence at all the points, except Station DH65, appears to have arrested, and at <br />this point subsidence has slowed way down, and may have stopped. Information on wide-spaced <br />monument surveying indicates stabilization, and approval to discontinue monitoring by the <br />3 <br />
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