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IZM TRTUM 8 RSSOCIRTES TEL~71~995-7191 May 24.9 518 No .007 P.11 <br />n1. ~~~1S~L 11:[7 INUIt I'lUH E1161 HEEB ING 7U TpI UN_ll lON P. u3 <br />Subsidence Over I6mited Extraction Room and pillar Mining Page 2 <br />Burvey lies flue over the room and p111ar sectioa, with ne retmnt shows signiScant <br />measurable surface movement. notdag espeaial)vy moaument8l-10 to 1.12. <br />Map B is the same area with a di8erant•eeale. <br />Map C shows a typical aeotioa along the state highway, the depth from the surface <br />to the coal in this section is about 200 ft. Aocoirding to Mr Snow there was <br />signi$oant subsidence is these sections whiob effected the surface. there is a section <br />of the mine about ?A00 ft oast that is clearly marred " Do not pull pillars." <br />I am that the Faz technology that I'have avalable, doss not lend itself to <br />sendlag these full size maps, but they do east and they are available for.review. <br />I zealize that some of these facts are wntrary to your observations and experience, <br />however earth science is not precise, if it were, earthquakes would be more <br />predictable. Faulting, liaeameats, changes in the water table, and other aapectr <br />mqy ell effect the model as it apparently doss is this coal area. <br />.My oondueioa is that measurable, signiilcaat, surl3aoe movements have occurred in <br />this region, over room and pillar mines with limited extraction, that is, mining <br />widths of 20 ft. t and pillars that have widths of 80 to 80 ft and lengths commonly <br />over 100 R <br />For your information the sump pump gituat{on has been thoroughly investigated by <br />the (3eotechnical engineer, W. Attwooll, and his conclusion that it was not a factor. <br />.. .. _ .:Y.aw.!'..wMb~.~e~.wdv+r.v'..n.).`..sW+ri:~upr..r., w.'Jr.J~^Mh...a!+yi/w'JS~ <br />