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<br />The method of spoil disposition was approved by a Department of Interior <br />Task Force as part of the Colowyo mine plan in August, 1977. A rer_ent study was <br />conducted on behalf of OSi4 on the spoil area and a draft report found the stabi- <br />lity factor to be greater than that required by law. <br />As part of this application, Colo~rfo proposes to install and maintain <br />a monitoring system assuring collection of data and the abilit}~ to identify <br />potential risks to the environment and public health and safety that may occur. <br />A well will be drilled in the terrace at the 6900 foot level of the fill slope <br />down to the natural base elevation of approximately 0600 feet. A piezometer <br />will be installed in the hole to measure water presence in the spcii_ :..o <br />survey monuments will be placed on each of the terraces at the 6100 foot, 6800 <br />foot, and 5900 loot levels. Control points will be used on each of the natural <br />banks providing for measurement of vertical and horizontal movement. <br />Attached is a drawing reflecting the configuration of the spoil fill, <br />the major portion of which was included as part of mine plan approved in August, <br />1977. Also noted in the 3rawing are the locations of the pizometer well and <br />survey monuments. <br />Respectfully submitted, <br />COLOWYO COAL C0f~AP1Y <br />John D. Ward <br />Manager, <br />Government & Employee Relations <br />JDW/ymc <br />cc: Donald A. Crane <br />Regional Director <br />Office of Surface t4ining <br />Post Office Building <br />1823 Stout Street <br />Denver, Colorado 80202 <br />Hamlet J. Barry, III <br />Director <br />Civisio r. of Plined Land Reclamation <br />1313 Sherman Street <br />Denver, Colorado 80203 <br />William H. Penny <br />Department Counsel <br />Office of the Regional Solicitor <br />U.S. Department of the Interior <br />P.O. Box 25007 <br />Denver Federal Centex . <br />Denver, Colorado 80225 <br /> <br />• <br />;. <br />