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All field construction and surveying will have to be completed in the summer <br /> months after the snow cover has melted and before the first major snow storm <br /> in the fall . <br /> Task II - Instrumentation Plan <br /> Mine Subsidence Engineering Company proposes to measure surface deforma- <br /> tion over panels 301 and 302 at the Mid-Continent Resources , Inc. , No. 3 Mine <br /> (Figure 2). The surface response to mining shall be .determined through the <br /> measurement of both vertical and horizontal displacements of the ground <br /> surface. Subsidence response would be obtained for the second or lower lift <br /> on panel 301 (301L) and for both lifts of panel 302 (302 and 302L) . The time <br /> required to completely mine all three lifts will be approximately 61 months. <br /> The time required to complete the proposed subsidence investigation and final <br /> • report will be approximately 73 months assuming the contract com,:ences an <br /> October 1, 1980. <br /> The difference between mining time and project duration is caused by the <br /> ' .. <br /> ;eatner-imposed delay in completing the final , after mining survey. '•:ni le <br /> mining is to be completed in October 1985, the final surrey can not :;e per- <br /> formed until the snow cover has melted off in July 1986. <br /> A variety of techniques were explored as possible methods to monitor <br /> subsidence in the study area. These included areal and terrestrial Photo- <br /> grar^mctry, remote position monitoring instruments and conventional surveying- <br /> Preliminary engineering analysis indicated that conventional surveying and <br /> areal photogramir,etric methods would be the most cost effective monitoring <br /> . techniques. <br /> • An on-the-ground site reconnaissance was conducted by Mine Subsidence <br /> Engineering personnel on July 20 , 1980 to explore the applicability of the <br />