_GENERAL DOCUMENTS - C1981017 ‎(246)‎

• Permit No: C1981017
• IBM Index Class Name: GENERAL DOCUMENTS
• Doc Name: Bid Documents ‎(IMP)‎ TR-17 Correspondence
• Permit Index Doc Type: General Correspondence
• Media Type: D
• Archive: No

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Monument Construction
Two types of monuments were constructed in the site area:
survey control monuments and subsidence monitoring points.
Survey Control Monuments-
No survey control existed in the subsidence monitoring area because
of its remote location. It was therefore necessary to bring coordinate
and elevation control into the monitoring area from Mid-Continent's
mine survey control net. One of Mid-Continent's triangulation stations•
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