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\Vest Eik Coal Company, Inc. ~R,I V:::Ce DV[ .9: ::O~nefSel. VJIOfaoo ~I_,il Tel?cnone JOJ 929 :015 I'ebruar}~ ^_1, 1996 11r. Jim Pendleton Colorado ;.lined Land Reclamation Division I31~ Sherman Street Denver, CO 90203 Dear Jim: As you are aware. .Vest °1F: Coal Company is currently development mining the 1st South Panel off of the 1st SVest Sub main at the tilt. Gunnison No. 1 dine iCJILRD Permit No. C-007-80). This panel has been instrumented with a subsidence monitoring network as described in the permit. Initial ;round surveys have been performed to establish baseline conditions. As described in the permit, we would very much like to correlate an aerial survey to the ground surveys in order to ascertain the accurac;~ and feasibility of per:crming f~~ture subsidence monitoring by ae.^ial photePram;netric methods. An aerial survey series was performed before development mi;,ing was begun. The aerial survey did not produce the required accuracy. However, both LYECC and the photogrammetric consultant feel that the inaccuracies resulted from the panel target design and not from the aerial survey itself. In order to correlate the aerial survey with ;round surveys, a new se[ of targets needs to be installed, another ground survey run, and a n.e~.v aerial survey run. Several problem=_ I~ace arisen sehich must be solved. 1) Snow cover over the panel precludes an aerial survey un*.il mid-flay or esrly June ':) Produc;ion of coal and shipping requirements have incressed causing [he panel to Se mined faster than was earlier anticipated 3) 3loving the miner unit to another location to wait for suitable weather to aerial survey would be very costly and would be de[rirnental to our production; a scenario which .ve would very much like to avoid in the existing poor economic conditions. 1VECC is fully aware of the terms of the permit and stipulations and is cornmi[ted [o gathering the subsidence monitorin; data in s fully acceptable anu usable manner consistent svith permit criteria. However, we feel some alternatives may be available which will satisfy permit rceuirements and at the same time allow us [o begin retrest mining the panel.