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-= - ~: <br />~II ~I~~II~I~~I~~~~~ <br />999 <br />4/29/88 <br />TO: National I:ing Coal Inc. <br />SUDJECT: Quarterly Subsidence Monitoring, Monitoring Stations <br />The first quarterly survey ^heck for subsidence at the <br />Kin.a Coal Mine, La Plata Coun±y, Cclorado was made on Hpril 27, <br />19SS. <br />Four of the permanent control points were located and <br />checked. <br />The relationship between the points was checked by setting <br />up over Point 2, bacicslghtina Point 1 and turning both direct <br />and reverse angles to Points 3 and 4. Ail distanc:s to teach <br />point were also checked. Levels were run to c}reck the elevation <br />on al~ existing points. <br />In rechecking our pre~rious field notes and computations <br />an error was found in the reductions for Point 4. <br />In this first quarterly checY, of 1988 we have establistted <br />the true and correct coordinates for subsidence Foint 4 to be: <br />N E <br />8300.905 11324.935 <br />and the elevation to be 99.6. <br />The conclusion from the field data compiled or. April 27, <br />1986 shows that there has bean no evidence o_° appreciaole <br />difference in any of the` subsidence po=.nts. <br />1~~. C L ~ CV ~ J ~ ~ Z.C, <br />Ceciii~ Liz_--p (; <br />i <br />7 < <br />Cliff 'Schmid P.L.S. <br />