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<br />Mountain Coal Company <br />West Elk Mine <br />Post Ottioe Boz 591 <br />Somerset, Coloratlo 81434 <br />Telephone 303 929-5015 <br />February 10, 1992 <br />Ms. Christine E. Johnston <br />Reclamation Specialist <br />Colorado Mined Land <br />Reclamation Division <br />1313 Sherman St., Room 215 <br />Denver, CO 80203 <br />Re: Permit C-80-007 Technical Revision No. 61 <br />Adequacy Response <br />Dear Christine: <br />-"~~`" III I IIIII IIIIIIIIII <br />/\ <br />~4U_-~•'-~'~ - _ <br />= E613199i <br />Mined Land <br />.,:.: <br />In response to your letter of January 23, 1992, requesting the specific <br />geotechnical data used for the stability analysis for the use of gob in the fill <br />of the stack tubes area, Mr. Charlie Rehn, P.E. of Envirocon, Inc. <br />(formerly of GeoWest Golden, Inc.) has prepared a summary letter. The <br />Lower Refuse Pile application (Exhibit 49) mentioned in the letter can be <br />found in Volume 10 of the new permit volumes. A table from the Lower <br />Refuse Pile application which summarizes strength data is also attached. <br />I have copies of specific laboratory data reports should Mr. Stover requue <br />them. <br />Please don't hesitate to contact me should you have further questions. <br />Sincerely, <br /> <br />Kathleen G. Welt <br />Environmental Engineer <br />xc: J.L. Coffey <br />J.D. Miller <br />P.G. Schmidt <br />KG W/mer <br />AMC0620~ <br />